CN111936097A - Pants-type disposable diaper - Google Patents

Pants-type disposable diaper Download PDF

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Publication number
CN111936097A
CN111936097A CN201980023128.0A CN201980023128A CN111936097A CN 111936097 A CN111936097 A CN 111936097A CN 201980023128 A CN201980023128 A CN 201980023128A CN 111936097 A CN111936097 A CN 111936097A
Authority
CN
China
Prior art keywords
pressure region
high pressure
stretchable
right direction
pants
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201980023128.0A
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Chinese (zh)
Other versions
CN111936097B (en
Inventor
笹山贤一
村上圭
永山唯
近藤大贵
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Unicharm Corp
Original Assignee
Unicharm Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2018071289A external-priority patent/JP6503489B1/en
Priority claimed from JP2018124400A external-priority patent/JP7171266B2/en
Priority claimed from JP2018247119A external-priority patent/JP2020103719A/en
Priority claimed from JP2019008507A external-priority patent/JP7195945B2/en
Application filed by Unicharm Corp filed Critical Unicharm Corp
Priority to CN202210021553.XA priority Critical patent/CN114376799B/en
Priority to CN202210020757.1A priority patent/CN114376798B/en
Publication of CN111936097A publication Critical patent/CN111936097A/en
Application granted granted Critical
Publication of CN111936097B publication Critical patent/CN111936097B/en
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Anticipated expiration legal-status Critical

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/49—Absorbent articles specially adapted to be worn around the waist, e.g. diapers
    • A61F13/496—Absorbent articles specially adapted to be worn around the waist, e.g. diapers in the form of pants or briefs
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/49—Absorbent articles specially adapted to be worn around the waist, e.g. diapers
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/49—Absorbent articles specially adapted to be worn around the waist, e.g. diapers
    • A61F13/49007—Form-fitting, self-adjusting disposable diapers
    • A61F13/49009—Form-fitting, self-adjusting disposable diapers with elastic means
    • A61F13/49011—Form-fitting, self-adjusting disposable diapers with elastic means the elastic means is located at the waist region
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
    • A61F13/514—Backsheet, i.e. the impermeable cover or layer furthest from the skin
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/15203—Properties of the article, e.g. stiffness or absorbency
    • A61F2013/15284—Properties of the article, e.g. stiffness or absorbency characterized by quantifiable properties
    • A61F2013/15544—Permeability
    • A61F2013/15552—Air permeability
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/49—Absorbent articles specially adapted to be worn around the waist, e.g. diapers
    • A61F13/49007—Form-fitting, self-adjusting disposable diapers
    • A61F13/49009—Form-fitting, self-adjusting disposable diapers with elastic means
    • A61F2013/49038—Form-fitting, self-adjusting disposable diapers with elastic means the elastic means is located all around the absorbent article's perimeter

Abstract

A pants-type disposable diaper provided with a front side belt part (21), a rear side belt part (22), and an absorbent core (11), wherein: a base region (21s) and a high pressure region (30s) are provided; a high-pressure region (30s) extends circumferentially around the front side belt part (21) and the rear side belt part (22), the high-pressure region including a stretchable film (30) between the skin side nonwoven fabric sheets (213, 223) and the non-skin side nonwoven fabric sheets (214, 224), the high-pressure region including a ventilation part in which air permeability is higher than in a portion where the stretchable film (30) is located, the high-pressure region not overlapping the absorbent core (11) in the front-rear direction in at least one of the front side belt part (21) and the rear side belt part (22).

Description

Pants-type disposable diaper
Technical Field
The present invention relates to a pants-type disposable diaper.
Background
As a first example of the background art, patent document 1 describes a pants-type disposable diaper in which both side edge portions of a front side portion and both side edge portions of a back side portion are joined to each other. The back side portion is provided with a first waistline elastic member and a second waistline elastic member that overlap auxiliary waistline elastic members arranged in parallel in the width direction (left-right direction) of the diaper. The first and second waist elastic members are configured such that regions where they cross each other are in contact with a wearer's greater trochanters (great trochanters) when the diaper is worn.
Patent document 2 discloses that a high-wearing-pressure region is formed by providing another stretchable sheet in addition to two sheets of an outer cover member of a pants-type disposable diaper. The high wear pressure region is configured to contact a region from the wearer's ilium to the wearer's anterior superior iliac spine.
As in patent documents 1 and 2, partially increasing the degree of close contact in the abdominal side portion and the back side portion (front side belt portion and back side belt portion) of the diaper can improve the fit of the diaper and suppress a slip-down.
As a second example of the background art, patent document 1 discloses a pants-type disposable diaper in which both side edge portions of a front side portion and both side edge portions of a back side portion are joined to each other. The back side portion of the diaper in patent document 1 is provided with a first waistline elastic member and a second waistline elastic member. The first and second waist elastic members are configured such that regions where they cross each other are in contact with the greater trochanter of the wearer. Therefore, even if the diaper does not include leg elastic members, no slip-down occurs, and leakage can be prevented.
As a third example of the background art, patent document 2 discloses a pants-type disposable diaper including an absorbent main body and an outer cover member that fixes the absorbent main body. The outer cover member of the diaper in patent document 2 has a structure in which two sheets are overlapped with each other, and has a high-wearing pressure region formed by providing another stretchable sheet in addition to the two sheets. The high application pressure region may effectively prevent the diaper from slipping down during wear by contacting the wearer's region from his ilium to his anterior superior iliac spine.
Documents of the prior art
Patent document
Patent document 1: japanese patent No. 5107760
Patent document 2: japanese patent No. 5020362
Disclosure of Invention
Problems to be solved by the invention
At least one of the following first and second problems is a problem to be solved by the present invention.
A first problem is that all the elastic members in patent document 1 are thread-like (string-like) members. For this reason, the portion provided with the linear elastic member is locally brought into close contact with the wearer and a trace of the elastic member (band-like trace) is left on the skin of the wearer.
If the high wearing pressure region is formed by the stretchable sheet as in patent document 2, the elastic member (stretchable member) is less likely to leave a mark. The stretch film is an example of a stretch sheet, but the stretch film has poor air permeability. If the stretchable film is disposed without a gap in the high wearing pressure region as in patent document 2, the air permeability is low in the high wearing pressure region. In patent document 2, the stretchable film is exposed on the skin side of the wearer. For this reason, the stretch film is easily in contact with the wearer's skin without gaps, and is even less breathable.
The present invention has been made in view of the conventional problems such as described above, and an object of the present invention is to provide a pants-type disposable diaper which improves the degree of close contact of portions in the front side belt portion and the rear side belt portion while also suppressing the formation of marks of stretchable members and the reduction of air permeability.
A second problem is that the first waist elastic member of the diaper in patent document 1 extends from the edge portion of the leg opening to the edge portion of the waist opening. In other words, the end portion of the first waist elastic member on one side is positioned at the leg opening, and the first waist elastic member is contracted in such a manner that the leg opening is expanded. For this reason, the first waistline elastic member does not easily provide a contractive force sufficient to support the wearer's movement (muscular force).
The second waistline elastic member extends from the side edge portion of the back portion toward the central portion of the back portion on the crotch portion side. In other words, the second waistline elastic member is located at a portion that is in contact with the gluteus maximus of the wearer, where muscles and skin are greatly stretched by the movement of the wearer. For this reason, when the wearer moves, friction is easily generated between the wearer and the diaper and the comfort of the diaper is lowered.
The present invention has been made in view of the conventional problems such as described above, and an object of the present invention is to provide a pants-type disposable diaper which supports the movement of a wearer while also being comfortable.
A third problem is that, if the position of the high wearing pressure region (high pressure region) cannot be identified by the diaper wearer or the caregiver, it is difficult to adjust the wearing position of the diaper in such a manner that the high wearing pressure region is located at the proper position of the wearer. Therefore, the effect of the high wearing pressure region may not be obtained. On the other hand, if the high application pressure region is located at a portion where contraction is not desired (for example, the lower abdominal region and the raised region of the buttocks), the comfort of the diaper may be reduced.
The present invention has been made in view of the conventional problems such as described above, and an object of the present invention is to enable a pants-type disposable diaper having a high pressure region to be worn in place on a wearer.
Means for solving the problems
A main aspect of the present invention for solving the first problem is a pants-type disposable diaper having an up-down direction, a left-right direction, and a front-back direction which intersect with each other,
the pants-type disposable diaper includes:
a front side band portion;
a rear side belt portion; and
an absorbent body comprising an absorbent core,
the front side belt part and the back side belt part form a waist opening at an upper end of the pants-type disposable diaper,
the front belt part and the rear belt part each include a skin-side nonwoven fabric sheet, a non-skin-side nonwoven fabric sheet, and a stretchable member,
the skin-side nonwoven fabric sheet is located at the position closest to the skin side,
the non-skin side nonwoven fabric sheet is located at the position closest to the non-skin side,
the stretchable member is stretchable in the left-right direction,
the front side belt portion and the back side belt portion each having a stretch region, a base region and a high pressure region, the stretch region being a region extending along an edge of the waistline opening,
the base region is a region adjacent to a lower side of the stretchable region at a center of the front side belt portion in a left-right direction,
the high pressure region is disposed below the telescopic region,
a magnitude of a force required to elongate the unit width portion of the high pressure region by a unit length in the left-right direction is larger than a magnitude of a force required to elongate the unit width portion of the base region by a unit length in the left-right direction,
the high pressure region extending circumferentially around the front and back band portions,
the high pressure region includes an elastic film between the skin-side nonwoven fabric sheet and the non-skin-side nonwoven fabric sheet,
the high pressure region includes a vent portion in which air permeability is higher than in a portion where the stretchable membrane is located,
the high pressure region does not overlap the absorbent core in the front-rear direction in at least one of the front side belt portion and the rear side belt portion.
A main aspect of the present invention for solving the second problem is a pants-type disposable diaper having an up-down direction, a left-right direction, and a front-back direction intersecting with each other, comprising: a front side band portion; a rear side belt portion; and a pair of locking portions in which both side portions in the left-right direction of the front belt portion are locked to both side portions in the left-right direction of the rear belt portion, the rear belt portion has a low pressure region and a high pressure region, the low pressure region and the high pressure region are stretchable in the left-right direction, a magnitude of a force required to elongate a unit length per unit width portion in the up-down direction of the high pressure region in the left-right direction is larger than a magnitude of a force required to elongate a unit length per unit width portion in the up-down direction of the low pressure region in the left-right direction, the high pressure region extends continuously in the left-right direction between the pair of locking portions, and a length in the up-down direction of the high pressure region in the left-right direction of the high pressure region is larger than in a central portion in the left-right direction of the high pressure region Is longer, the lower end of the high pressure region is located lower in both end portions in the left-right direction than in a central portion in the left-right direction of the high pressure region, and the low pressure region is disposed adjacent to a lower side of the high pressure region in the central portion in the left-right direction of the rear belt portion.
A main aspect of the present invention for solving the third problem is a pants-type disposable diaper having an up-down direction, a left-right direction, and a front-back direction intersecting with each other, comprising: a belt portion; and an absorbent main body, the belt portion having a low pressure region and a high pressure region, the low pressure region and the high pressure region being located below the stretchable region extending along the edge of the waist opening, the low pressure region and the high pressure region being adjacent to each other, the low pressure region and the high pressure region having stretchability in the left-right direction, a magnitude of a force required to elongate a unit length in the left-right direction per unit width portion in the up-down direction of the high pressure region being larger than a magnitude of a force required to elongate a unit length in the left-right direction per unit width portion in the up-down direction of the low pressure region, the color of at least a portion of the high pressure region is different from the color of the low pressure region when the belt portion is viewed from at least one of a non-skin side and a skin side.
Other features of the present invention will become apparent by reading the description of the specification with reference to the accompanying drawings.
ADVANTAGEOUS EFFECTS OF INVENTION
In order to solve the first problem, an effect of the present invention is to provide a pants-type disposable diaper which improves the degree of close contact in portions of the front side belt portion and the rear side belt portion, while also suppressing the formation of marks of stretchable members and the reduction of air permeability.
In order to solve the second problem, an effect of the present invention is to provide a pants-type disposable diaper which supports movement of a wearer while also being comfortable.
In order to solve the third problem, the present invention has an effect of enabling a pants-type disposable diaper having a high pressure region to be worn in place on a wearer.
Drawings
Fig. 1 is a schematic perspective view of a pants-type disposable diaper 1.
Fig. 2 is a schematic plan view of the diaper 1 in an unfolded and extended state.
Fig. 3 is a schematic sectional view taken along line I-I in fig. 2.
Fig. 4A to 4C are conceptual views of the wearing state of the diaper 1.
Fig. 5A and 5B are schematic cross-sectional views of the ventral-side package 21 and the dorsal-side package 22.
Fig. 6A is an explanatory view of the high pressure region 30s, and fig. 6B is an explanatory view of the vent portion 33 and the weld portion 40.
Fig. 7A to 7C are explanatory diagrams of the high pressure region 30s according to the modification.
Fig. 8 is a schematic perspective view of a pants-type disposable diaper 300.
Fig. 9 is a schematic plan view of a diaper 300 in an unfolded and extended state.
Fig. 10 is a schematic sectional view taken along line I-I in fig. 9.
Fig. 11A is a diagram illustrating an example of the joint 350, and fig. 11B is a schematic sectional view of the front band portion 321 and the rear band portion 322.
Fig. 12 is a schematic plan view of the rear-side belt portion 322.
Fig. 13 is a schematic plan view of the front side belt portion 321.
Fig. 14A and 14B are explanatory views of the gluteus medius 60.
Fig. 15 is a schematic perspective view of a pants-type disposable diaper 500.
Figure 16 is a schematic plan view of a diaper 500 in an unfolded and extended state.
Fig. 17 is a schematic sectional view taken along line I-I in fig. 16.
Fig. 18A is a diagram showing an example of the joint 530 in the front side belt portion 521 and the rear side belt portion 522, and fig. 18B is a schematic sectional view of the front side belt portion 521 and the rear side belt portion 522.
Fig. 19 is a schematic plan view of the front side belt portion 521.
Fig. 20 is a schematic plan view of the rear-side belt portion 522.
Fig. 21 is a table showing the experimental results regarding the visibility of the high pressure region 560.
Fig. 22 is an explanatory diagram of the joint 530 formed in the stretchable film 565.
Detailed Description
At least the following matters will become clear from the description of the present specification and the accompanying drawings.
A pants-type disposable diaper having an up-down direction, a left-right direction, and a front-back direction intersecting with each other, comprising: a front side band portion; a rear side belt portion; and an absorbent body including an absorbent core, the front side belt portion and the rear side belt portion forming a waist opening at an upper end of the pants-type disposable diaper, each of the front side belt portion and the rear side belt portion including a skin side nonwoven fabric sheet at a position closest to the skin side, a non-skin side nonwoven fabric sheet at a position closest to the non-skin side, and a stretchable member stretchable in the left-right direction, each of the front side belt portion and the rear side belt portion having a stretchable region, a basal region and a high pressure region, the stretchable region being a region extending along an edge of the waist opening, the basal region being a region adjacent to a lower side of the stretchable region at a center of the front side belt portion in the left-right direction, the high pressure region being provided below the stretchable region, a magnitude of a force required to elongate the unit length of the unit width portion of the high pressure region in the left-right direction is larger than a magnitude of a force required to elongate the unit length of the unit width portion of the base region in the left-right direction, the high pressure region circumferentially extending around the front side belt portion and the rear side belt portion, the high pressure region including a stretchable film between the skin side nonwoven fabric sheet and the non-skin side nonwoven fabric sheet, the high pressure region including a vent portion in which air permeability is higher than in a portion where the stretchable film is located, the high pressure region not overlapping with the absorbent core in the front-rear direction in at least one of the front side belt portion and the rear side belt portion.
According to this pants-type disposable diaper, the degree of close contact in the portions of the front side belt portion and the rear side belt portion is improved, and displacement during use can be suppressed. Further, since the high-pressure region includes the stretchable film and the ventilation portion, the formation of a trace of the stretchable member and the reduction in air permeability can be suppressed. Further, since the stretchable film is positioned between the skin-side nonwoven fabric sheet and the non-skin-side nonwoven fabric sheet, it is possible to suppress damage to the stretchable film and ensure breathability in the planar direction between the diaper and the wearer's skin.
In such a pants-type disposable diaper, the stretchable member is a sheet-like member having air permeability.
According to this pants-type disposable diaper, the front side belt portion and the rear side belt portion are brought into close ground-surface contact with the wearer, so that the formation of the stretch member mark can be suppressed and the air permeability can be ensured.
In this pants-type disposable diaper, the stretchable member is a stretchable nonwoven fabric sheet, the stretchable nonwoven fabric sheet is disposed at a position between the skin-side nonwoven fabric sheet and the non-skin-side nonwoven fabric sheet, and the stretchable nonwoven fabric sheet is positioned on the skin side with respect to the stretchable film.
According to this pants-type disposable diaper, a space (ventilation path) is easily formed between the diaper and the skin of the wearer, and breathability in the planar direction is ensured.
In this pants-type disposable diaper, the stretchable member is a stretchable nonwoven fabric sheet, and in the stretchable region, a plurality of linear elastic members are arranged side by side at intervals in the vertical direction, and the plurality of linear elastic members stretch in the horizontal direction, and the vertical length from the upper end of the high pressure region to the upper end of the front belt portion is greater than the vertical length of the high pressure region at the center of the front belt portion in the horizontal direction.
According to such a pants-type disposable diaper, the high-pressure region is less likely to come into contact with the wearer's navel region where perspiration tends to occur, and therefore, the amount of steam in the diaper can be reduced.
In the pants-type disposable diaper, the plurality of stretchable films that are long in the left-right direction are arranged side by side at an interval in the up-down direction in the high pressure region, and a portion between the stretchable films adjacent in the up-down direction serves as the ventilation portion.
According to the pants-type disposable diaper, a decrease in air permeability of the high-pressure region can be suppressed.
In the pants-type disposable diaper, in the high-pressure region, an area of a portion where the stretchable film is located is larger than an area of the ventilation portion between the stretchable films adjacent in the up-down direction.
According to the pants-type disposable diaper, it is possible to suppress a decrease in air permeability of the high pressure region, improve the degree of close contact of the high pressure region, and suppress displacement of the diaper when worn.
With this pants-type disposable diaper, a value obtained by dividing the area of the ventilation portion by the area of the high pressure region is larger in the side portions in the left-right direction of the front side belt portion and the rear side belt portion than in the center portion in the left-right direction of the front side belt portion and the rear side belt portion.
According to this pants-type disposable diaper, the proportion of the ventilation portion in the high-pressure region in the left and right side portions where there is a large movement of the wearer (movement of the buttocks and the legs) is high. For this reason, it is possible to prevent obstruction of wearer's movement while also improving breathability of the high pressure region. On the other hand, the left-right direction central portion is firmly brought into close contact with a region where the amount of movement of the wearer is small, so that displacement when the diaper is worn can be effectively suppressed.
In such a pants-type disposable diaper, each of the stretchable films does not have a hole penetrating through the stretchable film.
According to the pants-type disposable diaper, the strength of the stretchable film can be suppressed from being reduced due to the holes. In addition, the contractile force of the stretchable film can be effectively utilized.
With this pants-type disposable diaper, the stretchable film has a hole penetrating through the stretchable film, and the hole forms the ventilation portion.
According to the pants-type disposable diaper, a decrease in air permeability of the high-pressure region can be suppressed.
In this pants-type disposable diaper, the skin-side nonwoven fabric sheet, the non-skin-side nonwoven fabric sheet, the stretchable member, and the stretchable film are welded together in the front-back direction using the same welding pattern.
According to this pants-type disposable diaper, the wet air in the diaper can be effectively discharged in the front-back direction (thickness direction) in the front-side belt portion and the back-side belt portion, and the air permeability can be improved.
In this pants-type disposable diaper, the welded pattern is a pattern in which a plurality of welded portions are scattered, and the area of the ventilation portion is larger than the area of the welded portion located in the high-pressure region in the extended state of the pants-type disposable diaper.
According to the pants-type disposable diaper, it is possible to suppress a decrease in air permeability in the high-pressure region due to the welded portion.
A pants-type disposable diaper having an up-down direction, a left-right direction, and a front-back direction intersecting with each other, comprising: a front side band portion; a rear side belt portion; and a pair of locking portions in which both side portions in the left-right direction of the front belt portion are locked to both side portions in the left-right direction of the rear belt portion, the rear belt portion has a low pressure region and a high pressure region, the low pressure region and the high pressure region are stretchable in the left-right direction, a magnitude of a force required to elongate a unit length per unit width portion in the up-down direction of the high pressure region in the left-right direction is larger than a magnitude of a force required to elongate a unit length per unit width portion in the up-down direction of the low pressure region in the left-right direction, the high pressure region extends continuously in the left-right direction between the pair of locking portions, and a length in the up-down direction of the high pressure region in the left-right direction of the high pressure region is larger than in a central portion in the left-right direction of the high pressure region Is longer, the lower end of the high pressure region is located lower in both end portions in the left-right direction than in a central portion in the left-right direction of the high pressure region, and the low pressure region is disposed adjacent to a lower side of the high pressure region in the central portion in the left-right direction of the rear belt portion.
According to the pants-type disposable diaper, the high-pressure region is connected to the front side belt portion, and therefore, a reduction in the restraining pressure in the high-pressure region can be suppressed. In addition, the high pressure region is configured to match the position of the gluteus medius of the wearer. Thus, the high pressure region can restrain the gluteus medius so that the wearer's motion (walking) can be supported. On the other hand, the low-pressure region is configured to match the position of the gluteus maximus of the wearer, and therefore the gluteus maximus having a large amount of stretch can be suppressed from being excessively restrained, and the comfort of the diaper can be improved.
With this pants-type disposable diaper, the lower end of the high pressure region is inclined downward from the center portion of the high pressure region in the left-right direction toward both end portions.
According to this pants-type disposable diaper, the shape of the high-pressure region is similar to the shape of the gluteus medius of the wearer, which makes it possible to further support the movement (walking) of the wearer.
With this pants-type disposable diaper, the pants-type disposable diaper further includes an absorbent core, the high pressure region is disposed so as not to overlap the rear side portion of the absorbent core in the front-rear direction, and the low pressure region is disposed at least between a lower end of the high pressure region and an upper end of the rear side portion of the absorbent core.
According to the pants-type disposable diaper, the absorbent core can be suppressed from contracting due to the high pressure region, and the comfort of the diaper can be improved.
With this pants-type disposable diaper, the front side belt portion has a front side stretchable member stretchable in the left-right direction, the front side stretchable member continuously extends in the left-right direction between the pair of locking portions, and the high pressure region is connected to the front side stretchable member in the locking portions.
According to this pants-type disposable diaper, the high-pressure region and the front side stretchable member are attached to each other while extending circumferentially around the waistline of the wearer, and displacement of the diaper can be suppressed. In addition, the restraining pressure of the high-pressure area increases, and the movement (walking) of the wearer can be further supported.
In this pants-type disposable diaper, the front side belt portion includes: a front side low pressure region having stretchability in the left-right direction; and a front side high pressure region including the front side stretchable member, a magnitude of a force required to elongate a unit length of the unit width portion in the up-down direction of the front side high pressure region in the left-right direction is larger than a magnitude of a force required to elongate a unit length of the unit width portion in the up-down direction of the front side low pressure region in the left-right direction, and the high pressure region is connected to the front side high pressure region in the locking portion.
According to this pants-type disposable diaper, the high-pressure region and the front side stretchable member are attached to each other while extending circumferentially around the waistline of the wearer, and displacement of the diaper can be suppressed. In addition, the restraining pressure of the high-pressure area increases, and the movement (walking) of the wearer can be further supported.
With this pants-type disposable diaper, the front side high pressure region includes a plurality of the front side stretchable members arranged side by side at an interval in the up-down direction, the high pressure region includes a plurality of rear side stretchable members arranged side by side at an interval in the up-down direction, the rear side stretchable members stretch in the left-right direction, and in the locking portion, the front side stretchable member at the highest position and the rear side stretchable member at the highest position are connected to each other, and the front side stretchable member at the lowest position and the rear side stretchable member at the lowest position are connected to each other.
According to this pants-type disposable diaper, the high-pressure region and the front side stretchable member are attached to each other while extending circumferentially around the waistline of the wearer, and displacement of the diaper can be suppressed. In addition, the restraining pressure of the high-pressure area increases, and the movement (walking) of the wearer can be further supported.
With this pants-type disposable diaper, the length in the up-down direction of the front side high pressure region is longer in both end portions in the left-right direction of the front side high pressure region than in a central portion in the left-right direction of the front side high pressure region, and the position at which the upper end of the front side high pressure region is located is higher in both end portions in the left-right direction of the front side high pressure region than in the central portion in the left-right direction of the front side high pressure region.
According to this pants-type disposable diaper, the front high-pressure region can restrain the gluteus medius on the side of the wearer, and therefore can further support the wearer's movement (walking). In addition, the situation in which the front side high pressure region restrains the abdominal region of the wearer can be suppressed, and the comfort of the diaper can be improved.
In this pants-type disposable diaper, the front low pressure region is disposed adjacent to an upper side of the front high pressure region in a central portion of the front belt portion in the left-right direction.
According to this pants-type disposable diaper, the front side low pressure region fits properly to the abdominal region of the wearer, and displacement of the diaper can be suppressed.
With this pants-type disposable diaper, the pants-type disposable diaper further includes an absorbent core, and the front side high pressure region is arranged so as not to overlap with a front side portion of the absorbent core in the front-rear direction.
According to the pants-type disposable diaper, the absorbent core can be suppressed from contracting due to the front side high pressure region, and the comfort of the diaper can be improved.
In this pants-type disposable diaper, the high-pressure region includes a plurality of rear stretchable members arranged side by side at an interval in the vertical direction, the rear stretchable members stretch in the horizontal direction, and an interval between the rear stretchable members adjacent in the vertical direction is wider in both end portions in the horizontal direction of the high-pressure region than in a central portion in the horizontal direction of the high-pressure region.
According to this pants-type disposable diaper, the length of the high-pressure region in the vertical direction is longer in both the right and left direction end portions of the high-pressure region than in the right and left direction center portion of the high-pressure region. Thus, the high pressure region is configured to match the position of the gluteus medius of the wearer and can support the wearer's movements (walking).
With this pants-type disposable diaper, the high pressure region includes a rear side stretchable member that stretches in the left-right direction, and the rear side stretchable member is a sheet-like member.
According to this pants-type disposable diaper, the high-pressure region fits over a wide region of the gluteus medius of the wearer, and therefore the wearer's movement (walking) can be further supported. In addition, the high-pressure region lies flat against the wearer, so that local contraction can be prevented and the comfort of the diaper can be improved.
In the pants-type disposable diaper, a stretchable nonwoven fabric sheet and a stretchable film are disposed between a skin side sheet and a non-skin side sheet in the high pressure region, and the stretchable nonwoven fabric sheet is disposed between the skin side sheet and the non-skin side sheet in the low pressure region.
According to this pants-type disposable diaper, the high pressure region and the low pressure region lie flat against the wearer, so localized contraction can be prevented, and the comfort of the diaper can be improved.
With such a pants-type disposable diaper, the stretchable member is arranged to extend along the pair of leg openings.
According to this pants-type disposable diaper, the stretchable member at the leg opening is in close contact with the legs of the wearer, and the diaper can be prevented from being pulled too high. Therefore, the diaper can be properly worn in such a manner that the high-pressure region is located at the gluteus medius of the wearer.
A pants-type disposable diaper having an up-down direction, a left-right direction, and a front-back direction intersecting with each other, comprising: a belt portion; and an absorbent main body, the belt portion having a low pressure region and a high pressure region, the low pressure region and the high pressure region being located below the stretchable region extending along the edge of the waist opening, the low pressure region and the high pressure region being adjacent to each other, the low pressure region and the high pressure region having stretchability in the left-right direction, a magnitude of a force required to elongate a unit length in the left-right direction per unit width portion in the up-down direction of the high pressure region being larger than a magnitude of a force required to elongate a unit length in the left-right direction per unit width portion in the up-down direction of the low pressure region, the color of at least a portion of the high pressure region is different from the color of the low pressure region when the belt portion is viewed from at least one of a non-skin side and a skin side.
According to the pants-type disposable diaper, the user can recognize the position of the high pressure region and can position the high pressure region at the region to be restrained of the wearer. Thus, the diaper is put in place on the wearer, and the effect of the high pressure area is obtained. It is also possible to suppress a reduction in the comfort of the diaper due to the high pressure region being located in an area of the wearer that is not to be restrained.
With this pants-type disposable diaper, when the belt portion is viewed from at least one of the non-skin side and the skin side, the color of the contour portion of the high-pressure region in the up-down direction is different from the color of the low-pressure region.
According to the pants-type disposable diaper, the boundary between the high pressure region and the low pressure region is clear, and the user can more easily recognize the position of the high pressure region.
For this pants-type disposable diaper, when the belt portion is viewed from at least one of the non-skin side and the skin side, Δ a is made to be a difference in a value of a in a color system of la a b between the high pressure region and the low pressure region, and Δ b is made to be a difference in b value in a color system of la b between the high pressure region and the low pressure region, a color difference Δ E between the high pressure region and the low pressure region calculated using the following expression is 1.45 or higher: Δ E ═ [ (Δ a) 2+ (Δ b) 2] 1/2.
According to the pants-type disposable diaper, a user can distinguish between a high pressure region and a low pressure region.
With such a pants-type disposable diaper, when the belt portion is viewed from the non-skin side,
the color difference Δ E is 1.45 or higher.
According to this pants-type disposable diaper, the high pressure region can be viewed from the non-skin side (outer side), and therefore the high pressure region can be easily recognized by the user, and the high pressure region is easily positioned at the region to be restrained of the wearer.
With this pants-type disposable diaper, the high-pressure region includes an extensible member that extends and contracts in the left-right direction, and the color of the extensible member is different from the color of the low-pressure region.
According to this pants-type disposable diaper, the high-pressure region recognized by the user coincides with the region having a high restraining pressure, and therefore the effect of the high-pressure region is easily obtained.
In the pants-type disposable diaper, the plurality of members overlap each other in the thickness direction of the belt portion in the high pressure region, and the stretchable member is disposed on the non-skin side.
According to this pants-type disposable diaper, the high pressure region can be more easily observed from the non-skin side (outer side), and therefore the high pressure region can be easily recognized by the user, and the high pressure region is easily positioned at the region to be restrained of the wearer.
In such a pants-type disposable diaper, the stretchable member is a sheet-like stretchable member.
According to this pants-type disposable diaper, since the colored stretchable member has a flat shape, the area of the portion where the color of the high pressure region is different from the color of the low pressure region is large, and the high pressure region can be more easily recognized.
In the pants-type disposable diaper, the high-pressure region includes a plurality of the stretchable members arranged in parallel at an interval in the vertical direction.
According to the pants-type disposable diaper, a stripe pattern is formed in the high pressure region, the stripe pattern is conspicuous as a decorative feature, and the high pressure region can be more easily recognized by the user.
With this pants-type disposable diaper, the stretchable member is intermittently joined to the sheet disposed on the non-skin side with respect to the stretchable member by a plurality of joining portions, and the interval between the joining portions adjacent in the up-down direction is smaller than the length of the stretchable member in the up-down direction, and the interval between the joining portions adjacent in the left-right direction is smaller than the length of the stretchable member in the left-right direction.
According to this pants-type disposable diaper, fine wrinkles (irregularities) are formed in the stretchable member, so that the stretchable member is visible, and the user is given a soft impression to the diaper.
With this pants-type disposable diaper, the high pressure region includes: a different color portion having a color different from that of the low pressure region; and a non-different color portion that is a portion other than the different color portion, and a proportion of the different color portion per unit area is higher in a central portion of the belt portion in the left-right direction than in end portions of the belt portion in the left-right direction.
According to this pants-type disposable diaper, the high-pressure region is conspicuous in the central portion in the left-right direction of the belt portion, which is easily noticed by the user, and therefore the high-pressure region is easily recognized by the user.
With this pants-type disposable diaper, the belt portion includes a front side belt portion and a rear side belt portion, and the length in the up-down direction from the waistline opening to the upper end of the high pressure region in the center portion in the left-right direction of the front side belt portion is different from the length in the up-down direction from the waistline opening to the upper end of the high pressure region in the center portion in the left-right direction of the rear side belt portion.
According to this pants-type disposable diaper, the front side and the back side of the diaper can be discriminated on the basis of the visible high-pressure region.
With this pants-type disposable diaper, the belt portion includes a front side belt portion and a rear side belt portion, both side portions in the left-right direction of the front side belt portion are locked to both side portions in the left-right direction of the rear side belt portion in a pair of locking portions, the high pressure region has a first high pressure region in the front side belt portion, the first high pressure region extends continuously in the left-right direction between the pair of locking portions, and a central portion in the left-right direction of the first high pressure region is located below both end portions in the left-right direction of the first high pressure region.
According to the pants-type disposable diaper, the abdominal region of the wearer can be prevented from being excessively restrained by the first high pressure region. In addition, the front upper iliac spine region of the wearer can be restrained in both end portions in the left-right direction of the first high pressure region, and displacement of the diaper during use can be suppressed.
With this pants-type disposable diaper, the high pressure region has a second high pressure region in the front side belt portion, the second high pressure region extends continuously in the left-right direction between the pair of locking portions, both end portions in the left-right direction of the second high pressure region are located below the first high pressure region, and at least a part of a central portion in the left-right direction of the second high pressure region overlaps with the first high pressure region.
According to the pants-type disposable diaper, the abdominal region of the wearer can be prevented from being excessively restrained by the second high pressure region. In addition, the front superior iliac spine region of the wearer can be restrained in a supported manner from below in both end portions in the left-right direction of the second high pressure region, and displacement of the diaper during use can be suppressed.
With this pants-type disposable diaper, the belt portion includes a front side belt portion and a rear side belt portion, both side portions in the left-right direction of the front side belt portion are locked to both side portions in the left-right direction of the rear side belt portion in a pair of locking portions, the high pressure region has a third high pressure region in the rear side belt portion, the third high pressure region extends continuously in the left-right direction between the pair of locking portions, and a center portion in the left-right direction of the third high pressure region is located above both end portions in the left-right direction of the third high pressure region.
According to the pants-type disposable diaper, the central portion of the hip region of the wearer can be prevented from being excessively restrained by the third high pressure region.
With this pants-type disposable diaper, the high pressure region has a fourth high pressure region in the rear side belt portion, the fourth high pressure region extends continuously in the left-right direction between the pair of locking portions, both end portions in the left-right direction of the fourth high pressure region are located above the third high pressure region, and at least a part of a central portion in the left-right direction of the fourth high pressure region overlaps with the third high pressure region.
According to the pants-type disposable diaper, the central portion of the hip region of the wearer can be prevented from being excessively restrained by the fourth high pressure region. In addition, the front upper iliac spine region of the wearer can be restrained in both end portions in the left-right direction of the fourth high pressure region, and displacement of the diaper during use can be suppressed.
In the embodiment 1, the following embodiments are not to be considered in all respects
Basic Structure of diaper 1
Fig. 1 is a schematic perspective view of a pants-type disposable diaper 1 (hereinafter, also referred to as a diaper 1). Fig. 2 is a schematic plan view of the diaper 1 in an unfolded and extended state. Note that the extended state of the diaper 1 is a state in which the diaper 1 is extended in such a manner as to eliminate wrinkles, and the size of a constituent member of the diaper 1 (for example, a sheet or the like constituting the exterior body 20) matches or approaches the size of the member itself. Fig. 3 is a schematic sectional view taken along a line I-I (center in the left-right direction) in fig. 2.
The diaper 1 has an up-down direction, a left-right direction, and a front-back direction that intersect each other, and has a thickness direction in which members overlap each other as shown in fig. 3. In the up-down direction, the side corresponding to the torso of the wearer is the upper side, and the side corresponding to the crotch of the wearer is the lower side. In the front-rear direction, the side corresponding to the abdomen of the wearer is the front side, and the side corresponding to the back side of the wearer is the rear side. In the thickness direction, the side in contact with the wearer is the skin side, and the opposite side is the non-skin side.
The diaper 1 includes an absorbent main body 10 and an exterior body 20 positioned on the non-skin side of the absorbent main body 10. The exterior body 20 includes a front side exterior body 21 (corresponding to the front side belt portion) positioned on the front side in the front-back direction, a back side exterior body 22 (corresponding to the back side belt portion) positioned on the back side in the front-back direction, and a crotch side exterior body 23 connecting the front side exterior body 21 and the back side exterior body 22.
Note that, although the exterior body 20 of the diaper 1 according to the present embodiment is configured by three members (the abdomen-side exterior body 21, the back-side exterior body 22, and the crotch-side exterior body 23), it is not limited thereto. For example, the front-side exterior body 21, the back-side exterior body 22, and the crotch-side exterior body 23 may be formed of one member. The crotch outer package 23 may be omitted.
When the diaper 1 is in the developed state shown in fig. 2, the front-side outer cover 21 is positioned on one end side in the longitudinal direction of the absorbent main body 10, and the back-side outer cover 22 is positioned on the other end side in the longitudinal direction of the absorbent main body 10. When the absorbent main body 10 of the diaper 1 in the unfolded state is folded once at the center CL in the longitudinal direction, both ends in the left-right direction of the abdomen-side outer cover 21 are joined to both ends in the left-right direction of the back-side outer cover 22 by welding or the like, and the pants-type state shown in fig. 1 is achieved. In other words, the longitudinal direction of the absorbent main body 10 coincides with the vertical direction of the diaper 1, and the front-side outer cover 21 and the back-side outer cover 22 are connected in a loop-like manner, so that the waistline opening 1a is formed at the upper end and the pair of leg openings 1b are formed on both sides in the left-right direction. Hereinafter, regions corresponding to both ends in the left-right direction where the front-side exterior body 21 and the back-side exterior body 22 are joined together are referred to as end joining regions 24.
As shown in fig. 3, the absorbent body 10 includes an absorbent core 11, a liquid-permeable front sheet 12 positioned on the skin side of the absorbent core 11, and a back sheet 13 positioned on the non-skin side of the absorbent core 11. The back sheet 13 of the present embodiment has a two-layer structure including a liquid-impermeable sheet 13a and a liquid-permeable sheet 13b disposed on the non-skin side of the liquid-impermeable sheet 13 a.
The absorbent core 11 is a member that absorbs and retains excretory fluid such as urine, for example, formed by liquid absorbent fibers such as pulp containing Super Absorbent Polymers (SAP). Although not shown, the outer peripheral surface of the absorbent core 11 may be covered with a liquid-permeable sheet made of tissue paper, nonwoven fabric, or the like.
As shown in fig. 2, the abdominal-side exterior body 21 and the back-side exterior body 22 respectively include waistline regions 211 and 221 and crotch regions 212 and 222 below the waistline regions 211 and 221, wherein the waistline regions 211 and 221 include end-joining regions 24 in the up-down direction.
The crotch regions 212 and 222 are substantially trapezoidal, and the left-right direction width (length in the left-right direction) thereof decreases toward the lower side. The crotch region 222 of the back-side outer package 22 is larger than the stomach-side outer package 21 so as to cover the hip region of the wearer.
As shown in fig. 3, the abdominal-side exterior body 21 and the back-side exterior body 22 respectively include skin side sheets 213 and 223, non-skin side sheets 214 and 224, and stretchable nonwoven sheets 215 and 225 (corresponding to stretchable members), wherein the stretchable nonwoven sheets 215 and 225 are located between the skin side sheets 213 and 223 and the non-skin side sheets 214 and 224 and have stretchability at least in the left-right direction of the diaper 1.
The skin side sheets 213 and 223, the non-skin side sheets 214 and 224, and the stretchable nonwoven sheets 215 and 225 are bonded by a plurality of welds (for example, refer to 40 in fig. 6B described later) that are interspersed. Therefore, the texture is softer than in the case of bonding by, for example, a cured adhesive. In addition, the stretchable nonwoven fabric sheets 215 and 225 are contracted between the welded portions, and thus the skin side sheets 213 and 223 and the non-skin side sheets 214 and 224 protrude in such a manner as to be bent outward in the thickness direction. In other words, the skin side panels 213 and 223 and the non-skin side panels 214 and 224 are raised between the welds, thereby making the texture softer and also giving the user a soft visual impression. Since the welded portions are scattered in such a manner that the gaps between the welded portions are relatively small, in the diaper 1 of the present embodiment, fine ridges (wrinkles) extending in various directions are formed, and it is possible to prevent the formation of unidirectional wrinkles (for example, longitudinal wrinkles or the like) peculiar to the diaper, thereby obtaining a good appearance of the diaper 1.
The stretchable nonwoven fabric sheets 215 and 225 include, for example, elastic thermoplastic elastomer fibers made of a polyurethane elastomer and non-elastic thermoplastic resin fibers made of a polyolefin resin such as polypropylene (PP). The stretchable nonwoven fabric sheets 215 and 225 are nonwoven fabric sheets subjected to an appropriate stretching treatment (such as gear stretching). By this stretching treatment, the stretchable nonwoven sheets 215 and 225 have stretchability in the lateral direction and the vertical direction of the diaper 1. Note that the elongation processing may be elongation processing performed in directions orthogonal to each other, or elongation processing performed only in a predetermined direction. In the case where the elongation treatment is performed only in the predetermined direction, the stretchability is exhibited in the predetermined direction, but it is not necessarily the case where all the fibers are oriented in the predetermined direction, and therefore the stretchability is also exhibited in the direction orthogonal to the predetermined direction.
Further, a plurality of waistline elastic members 26 (e.g., elastic threads) are disposed in the region extending along the edge of the waistline opening 1 a. Further, leg elastic members 27 (e.g., elastic threads or the like) are also arranged in regions extending along the edges of the leg openings 1 b. Therefore, the waistline region and the leg regions of the diaper 1 are reliably brought into contact with the wearer.
The crotch exterior body 23 has a similar structure to the front-side exterior body 21 and the back-side exterior body 22, and the crotch exterior body 23 includes a skin side sheet 231, a non-skin side sheet 232 positioned on the non-skin side, and a stretchable nonwoven fabric sheet 233 positioned between the skin side sheet 231 and the non-skin side sheet 232.
High pressure region 30s
Fig. 4A to 4C are conceptual views showing the wearing state of the diaper 1. Fig. 4A is a view from the front side, fig. 4B is a view from the rear side, and fig. 4C is a side view. In these figures, the first high pressure region 31s and the second high pressure region 32s are shown by dot-dash lines.
Fig. 5A and 5B are schematic cross-sectional views of the ventral-side package 21 and the dorsal-side package 22. Fig. 5A is a sectional view of the present embodiment, and fig. 5B is a sectional view of a modification.
Fig. 6A is an explanatory view of the high pressure region 30s, and fig. 6B is an explanatory view of the vent portion 34 and the weld portion 40.
The waistline regions 211 and 221 of the abdominal-side exterior body 21 and the back-side exterior body 22 have stretchable regions 26s extending along the edges of the waistline opening 1 a. The stretchable region 26s is a region where the linear waistline elastic member 26 having right and left stretchability is provided. Below the stretch region 26s, the waistline regions 211 and 221 each include a high pressure region 30s and a low pressure region 33s, the low pressure region 33s being a region other than the high pressure region.
The low-pressure region 33s is a region where an elastic nonwoven sheet 215(225) is provided between the skin side sheets 213(223) and the non-skin side sheets 214 (224). As shown in fig. 2, in the abdominal-side exterior body 21, the low-pressure region 33s includes a base region 21s adjacent to the lower side of the expansion/contraction region 26s at the center in the left-right direction.
The high-pressure region 30s is a region located between the skin side sheets 213(223) and the non-skin side sheets 214(224), in which the stretchable nonwoven fabric sheet 215(225) and the stretchable film 30 are provided, and extends circumferentially around the front-side outer cover 21 and the back-side outer cover 22. The stretchable film 30 is a sheet-like stretchable elastic member having a uniform thickness, and is obtained by, for example, melting an elastomer resin such as polyurethane or styrene. The elastic film is, for example, a film in which polyolefin layers are integrally formed on the upper and lower surfaces of the elastomer layer. If this type of stretchable film is used, it is considered that the polyolefin layer does not have stretchability, and therefore stretchability can be provided by stretching the film in advance. The provision of a polyolefin layer on the upper surface has the advantage of facilitating welding to a nonwoven sheet made of polyolefin fibres.
The high pressure region 30s is a region where the pressure (restraining pressure) is higher when the diaper 1 is worn than the low pressure region 33 s. In other words, the force required to elongate a portion of the high pressure region 30s having a unit width (unit length in the up-down direction) by the unit length in the left-right direction is greater than the force required to elongate a portion of the low pressure region 33s (base region 21s) having a unit width (unit length in the up-down direction) by the unit length in the left-right direction.
In other words, the contraction force acting in the left-right direction per unit length in the up-down direction in the high pressure region 30s is larger than the contraction force acting in the left-right direction per unit length in the up-down direction in the low pressure region 33 s. With a large contractive force in this way, the high-pressure region 30s is strongly pressed against the wearer.
Note that the magnitude of the force required to elongate the unit length of the high-pressure region 30s and the base region 21s (low-pressure region 33s) per unit width in the left-right direction may be measured and compared using a known method. For example, a sample having a predetermined size is cut out from the high pressure region 30s and the base region 21 s. Then, both end portions of each sample in the left-right direction of the diaper 1 were sandwiched in chucks of a tensile tester. The sample is then extended by pulling the chuck apart by a unit length, and the load (N) at this time can be used as a force required to extend the sample by the unit length in the left-right direction.
In this way, in the diaper 1 of the present embodiment, the high-pressure region 30s continuously extends in the circumferential direction in the portions of the front-side outer cover 21 and the back-side outer cover 22, so that the degree of close contact in the portions of the front-side outer cover 21 and the back-side outer cover 22 is improved. Therefore, as compared with the case where the degree of close contact between the entire abdominal-side outer cover 21 and the back-side outer cover 22 is improved, the diaper 1 can be prevented from shifting in position when worn, and the wearer does not feel excessively restrained. In addition to the high pressure regions 30s, the low pressure regions 33s can also be held against the wearer's body with appropriate pressure due to the stretchable nonwoven fabric sheets 215 and 225.
In the high pressure region 30s, the sheet-like stretchable film 30 is overlapped with the stretchable nonwoven fabric sheets 215 and 225. For this reason, the high-pressure region 30s can be in flat contact with the wearer, and the pressure applied by the high-pressure region 30s is uniformly applied to the wearer's skin. Therefore, local restraint such as in the case where a linear elastic member is provided instead of the stretchable film 30 can be prevented, and the formation of a trace of the stretchable member can be suppressed.
In addition, even if the stretch films 30 are thin, they have higher contractive force (restraining pressure) than the stretch nonwoven fabric sheet. For this reason, although the stretchable film 30 is overlapped on the stretchable nonwoven fabric sheets 215 and 225 in the high pressure region 30s, the thickness of the high pressure region 30s can be made small and deterioration of texture and heat dissipation can be suppressed.
In addition, at least in the abdominal-side outer covering 21 or the back-side outer covering 22, the high-pressure region 30s does not overlap the absorbent core 11 in the front-back direction (thickness direction). As shown in fig. 2, in the diaper 1 of the present embodiment, the high pressure regions 30s on the abdomen side and the back side do not overlap the absorbent core 11. For this reason, it is possible to suppress the case where the restraining pressure of the high pressure region 30s is damaged by the absorbent core 11 which is thick and has high rigidity.
In addition, in the front-side outer cover 21 and the back-side outer cover 22, the skin side sheets 213 and 223 located farthest on the skin side and the non-skin side sheets 214 and 224 located farthest on the non-skin side are nonwoven fabric sheets made of, for example, spunbond nonwoven fabric, SMS nonwoven fabric, or the like. In addition, the stretchable members which stretch the waistline regions 211 and 221 in the left-right direction are stretchable nonwoven fabric sheets 215 and 225. These nonwoven fabric sheets have air permeability in the thickness direction because they have spaces between constituent fibers.
On the other hand, the stretchable film 30 disposed in the high-pressure region 30s is inferior in air permeability to the nonwoven fabric. For this reason, if only the stretchable film 30 is provided in the high pressure region 30s, the air permeability of the high pressure region 30s is reduced. With this construction, the interior of the diaper 1 becomes moist, less comfortable and produces skin irritation (e.g., a rash).
Accordingly, the high-pressure region 30s has the vent portion 34 having higher air permeability than the portion where the stretchable film is located. In the high pressure region 30s of the present embodiment, the plurality of stretchable membranes 30 that are long in the left-right direction are arranged side by side at intervals in the vertical direction, and a portion between the stretchable membranes 30 adjacent in the vertical direction (i.e., a portion where the stretchable membrane 30 is not located) serves as the vent portion 34.
More specifically, the high pressure region 30s includes a first high pressure region 31s and a second high pressure region 32 s. In both the first high pressure region 31s and the second high pressure region 32s, the three stretchable membranes 30 are arranged side by side at intervals in the vertical direction. The three stretchable films 30 located on the ventral-side outer package 21 side and the corresponding three stretchable films 30 located on the dorsal-side outer package 22 side are arranged at the same positions in the vertical direction in the end portion bonding region 24. In other words, in the end portion bonding region 24, the three stretchable films 30 positioned on the front-side exterior body 21 side and the three stretchable films 30 positioned on the back-side exterior body 22 side are continuously connected to each other, and the high-pressure region 30s extends circumferentially around the front-side exterior body 21 and the back-side exterior body 22.
Since the high-pressure regions 30s have the ventilation portions 34 (air permeability in the thickness direction) in this way, the humid air inside the diaper 1 is discharged from the high-pressure regions 30s, and the vapor inside the diaper 1 can be alleviated. Thus, the comfort of the diaper 1 is improved and the rash and the like can be suppressed.
Note that, in the end bonding region 24, the high pressure region 30s on the ventral side and the high pressure region 30s on the dorsal side are not limited to being completely continuous with each other, and it is sufficient that they are at least partially continuous in the circumferential direction around the waistline. For example, the high-pressure region 30s on the ventral side may be configured to be higher than the high-pressure region 30s on the dorsal side, so that a height difference is provided in the end bonding region 24 and the high-pressure regions are partially connected.
In addition, the stretchable film 30 is interposed between the skin side sheet 213(223) and the non-skin side sheet 214 (224). Since the stretch film 30 is not exposed on the non-skin side, it is possible to suppress the damage or peeling of the stretch film 30 due to movement or rubbing against the wearer's clothes during use. In addition, if the stretchable film 30 is exposed on the skin side, the stretchable film 30 is easily brought into close contact with the skin of the wearer, and the air permeability of the high pressure region 30s in the plane direction thereof is reduced. To solve this problem, as shown in fig. 5A, the nonwoven fabric sheets such as the skin side sheets 213 and 223 protrude in a manner to be bent outward in the thickness direction due to shrinkage of the stretchable film 30. For this purpose, the skin side sheets 213(223) (nonwoven sheets) are disposed on the skin side of the stretchable membrane 30, and a space S (ventilation channel) is formed between the skin side sheets 213(223) and the skin of the wearer. Therefore, while ensuring air permeability in the planar direction of the front-side outer cover 21 and the back-side outer cover 22, the amount of steam inside the diaper 1 can be further reduced.
The regions other than the high pressure regions 30s also have air permeability in the thickness direction. More specifically, the elasticized region 26s is a region where the waist elastic members 26 are arranged side by side at an interval in the up-down direction, and each waist elastic member 26 is located between the skin side panels 213(223) and the non-skin side panels 214(224) having air permeability. Therefore, the stretch region 26S has air permeability.
In addition, the low-pressure region 33s (base region 21s) is a region where the stretchable nonwoven fabric sheets 215 and 225 having air permeability are provided, and each of the stretchable nonwoven fabric sheets 215 and 225 is located between the skin side sheet 213(223) having air permeability and the non-skin side sheet 214 (224). Therefore, the low-pressure region 33s also has air permeability.
In this way, the waistline regions 211 and 221 of the abdominal-side exterior body 21 and the back-side exterior body 22 have air permeability over the entire range thereof. For this reason, the vapor inside the diaper 1 can be further reduced.
As shown in fig. 6A, the vertical length L1 from the upper end 30a of the high-pressure region 30s to the upper end 21a of the abdominal-side package 21 is preferably greater than the vertical length L2 of the high-pressure region 30s at the center C of the abdominal-side package 21 in the horizontal direction (L1> L2).
According to this configuration, the high-pressure region 30s is at a relatively low position at the center C in the left-right direction of the abdominal-side exterior body 21. For this reason, the high-pressure region 30s is located at a relatively low position. Therefore, the high pressure region 30s does not easily abut against the wearer's navel region, and the vapor inside the diaper 1 can be further reduced. In addition, since the high pressure region 30s does not abut against the wearer's navel region, the wearer can more easily breathe.
In addition, it is preferable that the stretchable member disposed in the high pressure region 30s and the low pressure region 33s is a sheet-like member having air permeability. The sheet-like member having air permeability is a stretchable nonwoven fabric sheet 215 and 225 or a stretchable film having holes.
According to this configuration, the high-pressure region 30s and the low-pressure region 33s can be brought into close ground-surface contact with the wearer while also ensuring breathability in the high-pressure region 30s and the low-pressure region 33 s. For this reason, local restraint can be prevented, and the formation of a trace of the stretchable member can be suppressed. In addition, since the high-pressure area 30s and the low-pressure area 33s are in close ground-surface contact with the wearer, the contact area of the skin (i.e., frictional resistance) is increased. This can further suppress the displacement of the diaper 1 when worn.
Note that the above description is not limited, and the stretchable member may be a plurality of linear elastic members arranged side by side at intervals in the up-down direction. In addition, although the stretchable nonwoven fabric sheets 215 and 225 are not disposed in the stretchable zone 26s as shown in fig. 3 in the present embodiment, a sheet-like member having air permeability may be disposed in the stretchable zone 26 s.
Further, as shown in fig. 3, the stretchable nonwoven fabric sheet 215(225) is preferably disposed between the skin side sheet 213(223) and the non-skin side sheet 214(224), and is preferably positioned on the skin side with respect to the corresponding stretchable film 30.
According to this structure, as shown in fig. 5A, the two nonwoven fabric sheets (i.e., the stretchable nonwoven fabric sheet 215(225) and the skin side sheet 213(223)) protrude so as to be bent toward the skin side due to contraction of the stretchable film 30. For this reason, a large space S (ventilation channel) is formed between the skin side sheet 213(223) and the wearer' S skin. Therefore, this improves the air permeability in the planar direction of the abdominal-side exterior body 21 and the back-side exterior body 22.
The high-pressure region 30s of the present embodiment has the ventilation portion 34 located between the vertically adjacent stretchable membranes 30. In this case, it is preferable that each of the stretchable films 30 does not have a hole penetrating the stretchable film 30.
According to this configuration, a decrease in strength of the stretchable film 30 due to the holes can be suppressed. In addition, the restraining pressure of the stretchable membrane 30 is not lowered by the holes, and the stretchable membrane 30 can be effectively utilized. However, not limited thereto, the stretchable film 30 may have holes.
In the high-pressure region 30s, the area of the portion including the stretchable membrane 30 is preferably larger than the area of the vent portion 34 provided between the stretchable membranes 30 adjacent in the vertical direction. According to this configuration, the restraining pressure of the high pressure zone 30s can be improved while also suppressing a decrease in air permeability of the high pressure zone 30s, and displacement of the diaper 1 during use can be suppressed.
In the present embodiment, the stretchable membrane 30 and the vent part 34 have substantially the same length in the vertical direction. In addition, the first and second high pressure regions 31s and 32s each have three stretchable membranes 30 and two vent portions 34. For this reason, the area of the portion including the stretchable membrane 30 is larger than the area of the vent portion 34.
Note that the areas may be compared using a known method in the natural state of the diaper 1 or in the extended state of the diaper 1. For example, the comparison may be made visually, or the comparison may be made using the respective partial areas calculated by the area calculation software from the captured image of the high-pressure region 30 s.
In addition, it is preferable that the four types of sheets (i.e., the skin side sheets 213(223), the non-skin side sheets 214(224), the stretchable nonwoven fabric sheets 215(225), and the stretchable film 30 are bonded by welding in the thickness direction (front-rear direction) using the same welding pattern.
The welding pattern is a pattern in which a plurality of welding portions 40 are scattered. In the present embodiment, as shown in fig. 6B and fig. 7C described later, rectangular fusion-bonded portions 40 inclined at 45 degrees or-45 degrees from the left-right direction are arranged side by side at intervals in the left-right direction and the up-down direction. Note that the welding pattern shown in fig. 6B is an example, and the shape, size, number, arrangement, and the like of the welding portion 40 are not limited to the illustrated configuration.
Since the sheet is in a film-like state, the air permeability is reduced in the welded portion 40. For this reason, if the pair of sheets adjacent in the thickness direction are respectively welded and the welded portion 40 is displaced in the planar direction between the layers, the wet air inside the diaper 1 cannot be smoothly discharged as indicated by the arrow in fig. 5B. For this reason, by simultaneously welding the four types of sheets, it is possible to effectively discharge the moist air in the diaper 1 in the thickness direction as indicated by the arrow in fig. 5A, thereby improving the air permeability of the front-side outer cover 21 and the back-side outer cover 22 in the thickness direction.
In addition, sheets adjacent in the thickness direction may be bonded using an adhesive. Note that even when a cured adhesive is used, the air permeability is reduced. If the application patterns of the adhesive for bonding the sheets adjacent in the thickness direction are the same and the application positions overlap each other, the wet air inside the diaper 1 can be effectively discharged, but it is difficult to align the positions of the adhesive application patterns. For this reason, it is preferable to join the four types of sheets by simultaneous welding as described above.
In addition, it is preferable that the area of the vent portion 34 of the high-pressure region 30s is larger than the area of the welded portion 40 located in the high-pressure region 30s in the extended state of the diaper 1. Specifically, as shown in fig. 6B, it is preferable that the area of one vent portion 34 between the stretchable films 30 adjacent in the up-down direction is larger than the area of the welded portion 40 in one high-pressure region.
With this structure, the ventilation portion 34 can be prevented from being covered with the welded portion 40 having reduced air permeability. Therefore, the air permeability of the high pressure zone 30s can be maintained. Note that, as described above, the areas of the respective portions may be compared using a known method such as a method of visual comparison or a method using area calculation software.
In addition, in the end bonding region 24, the first high pressure region 31s is arranged above the second high pressure region 32s at a distance from the second high pressure region 32 s. Further, it is preferable that the first high pressure region 31s is configured such that at least its upper end is above the wearer's anterior superior iliac spine, and the second high pressure region 32s is configured such that at least its lower end is below the wearer's anterior superior iliac spine. In the present embodiment, the lower end of the first high pressure region 31s is configured to pass through the anterior superior iliac spine. Note that the anterior superior iliac spine is a protrusion of the ilium (the ilium is the largest bone in the pelvis), and is a protrusion that the fingers touch when the human hand is placed on the waist. Thus, when the diaper 1 is worn, the wearer's anterior superior iliac spine is interposed between the first high pressure region 31s and the second high pressure region 32 s. This therefore makes it possible to suppress displacement of the diaper 1 while being worn.
Further, on the ventral side, the first high pressure region 31s is curved convexly downward, and on the dorsal side, the first high pressure region 31s is substantially horizontal in the vicinity of the bottom of the expansion region 26 s. On the other hand, on the ventral side, the second high pressure region 32s is substantially horizontal, and on the dorsal side, the second high pressure region 32s is convexly curved upward. For this reason, as shown in fig. 4A to 4C, the lower end of the first high pressure region 31s on the back side is higher than the lower end of the first high pressure region 31s on the abdomen side at the center C in the left-right direction of the diaper 1. Similarly, at the left-right direction center C of the diaper 1, the lower end of the second high pressure region 32s located on the back side is higher than the lower end of the second high pressure region 32s located on the abdomen side. Thus, the abdominal region can be pressed obliquely upward, and the intra-abdominal pressure can be raised. This therefore makes it possible to assist the movement of the pelvic region muscles (e.g., abdominal muscles) and to stabilize the pelvis of the wearer.
As described above, in the lateral side portion a2 (see fig. 2) of the front-side exterior body 21 and the back-side exterior body 22, the first high-pressure regions 31s and the second high-pressure regions 32s are separated from each other in the vertical direction. On the other hand, in the left-right direction central portion a1 of the front-side exterior body 21 and the back-side exterior body 22, the first high-pressure region 31s and the second high-pressure region 32s partially overlap.
Therefore, in the lateral side portion a2 of the front-side exterior body 21 and the back-side exterior body 22, the ratio of the vent portion 43 in the high-pressure region 30s is higher than the ratio of the vent portion 43 in the lateral center portion a 1. In other words, a value obtained by dividing the area of the vent portion 43 by the area of the high pressure region 30s (the total area of the first and second high pressure regions 31s and 32 s) is large.
In this way, by setting the ratio of the high ventilation portions 43 in the left and right side portions a2 where the wearer's movement (movement of the hip and leg) is large, the restraining force of the high pressure region 30s can be suppressed, the air permeability of the abdominal-side exterior body 21 and the back-side exterior body 22 can be improved, and the wearer's movement can be prevented from being impaired. On the other hand, by setting the lower proportion of the ventilation sections 43 in the left-right direction central portion a1 where the wearer's movement is small, the left-right direction central portion a1 is reliably brought into close contact with the wearer, and displacement of the diaper 1 during use can be effectively suppressed.
Note that the left-right direction central portion a1 of the front-side exterior body 21 and the back-side exterior body 22 is a central portion when the front-side exterior body 21 and the back-side exterior body 22 are divided into three portions in the left-right direction, and the portions located on both outer sides of the central portion are left-right direction side portions a 2. In addition, the areas of the respective portions may be compared using a known method such as a method of visual comparison or a method using area calculation software.
In addition, the shape of the high pressure region 30s is not limited to the shape shown in fig. 2. For example, without being limited to providing two high pressure regions 30s, one or three or more high pressure regions 30s may be provided. In addition, the high pressure region 30s may be horizontal in the left-right direction on the ventral side and the dorsal side, for example.
Modification of the high pressure region 30s
Fig. 7A to 7C are explanatory diagrams of the high pressure region 30s according to the modification. Fig. 7A shows the stretchable film 30 in a natural state, and fig. 7B shows the stretchable film 30 in a left-right direction elongated state. Fig. 7C shows the dimensions of the weld 40.
Although not shown, in the high pressure region 30s according to the modification, the stretchable membrane 30 is disposed over the entire region of the high pressure region 30 s. In other words, in the high-pressure region 30s of this modification, the ventilation portions 34 are not provided between the stretchable membranes 30 arranged in parallel at intervals in the vertical direction (see fig. 6A). For this reason, the restraining pressure is substantially uniform in the high-pressure region 30s, and the contraction force applied by the high-pressure region 30s is stable.
The stretchable membrane 30 has a hole 50 penetrating the stretchable membrane 30, and the hole 50 serves as a vent portion of the high pressure region 30 s. According to this structure, the moist air inside the diaper 1 can be discharged through the holes 50, and the reduction in air permeability of the high-pressure region 30s in the thickness direction can be suppressed.
One example of a method for forming the hole 50 is as follows: as shown in fig. 7A, a plurality of slits extending in the vertical direction are formed in the stretchable film 30 in the natural state in parallel at intervals in the vertical direction and the horizontal direction. In this case, as shown in fig. 7B, in a state where the stretchable film 30 is stretched in the left-right direction, that is, in a wearing state, the holes 50 are spread in the left-right direction (for example, spread by about two to four times), thus allowing the humid air to be discharged through the holes 50. Note that the pattern of the holes 50 shown in fig. 7A and 7B is an example, and the shape, size, number, arrangement, and the like of the holes 50 are not limited to the illustrated configuration.
Further, similarly to the above-described embodiment, it is preferable that the area of the hole 50 (vent portion) is larger than the area of the weld portion 40 located in the high pressure region 30s in the extended state of the diaper 1. In the present embodiment, the length of the hole 50 in the left-right direction is about 2mm to 4mm and the length in the up-down direction is about 1mm in the extended state of the diaper 1. On the other hand, the fusion 40 is rectangular with a long side of about 0.5mm and a short side of about 0.3 mm.
In this way, the area of one hole 50 is larger than the area of one weld 40, thereby preventing the hole 50 from being covered by the weld 40. Therefore, the air permeability of the high pressure zone 30s can be maintained. Note that, as described above, the areas of the respective portions may be compared using a known method such as a method of visual comparison or a method using area calculation software.
In the second embodiment, the first embodiment is described as follows
A second embodiment of a pants-type disposable diaper will be described below taking as an example a pants-type disposable diaper for adults. However, the pants-type disposable diaper of the present invention is not limited to this, and can be applied to a disposable diaper for children (babies), sanitary pants, and the like.
Basic Structure of diaper 300
Fig. 8 is a schematic perspective view of a pants-type disposable diaper 300 (hereinafter, also referred to as a diaper 300). Fig. 9 is a schematic plan view of a diaper 300 in an unfolded and extended state. Fig. 10 is a schematic sectional view taken along the line I-I (center in the left-right direction) in fig. 9. Fig. 11A is a diagram showing an example of a joint 350 of the front band portion 321 and the back band portion 322, and fig. 11B is a schematic cross-sectional view of the front band portion 321 and the back band portion 322.
The diaper 300 has an up-down direction, a left-right direction, and a front-back direction that intersect each other, and has a thickness direction in which members overlap each other as shown in fig. 10. In the up-down direction, the side corresponding to the torso of the wearer is the upper side, and the side corresponding to the crotch of the wearer is the lower side. In the front-rear direction, the side corresponding to the abdomen of the wearer is the front side, and the side corresponding to the back side of the wearer is the rear side. In the thickness direction, the side in contact with the wearer is the skin side, and the opposite side is the non-skin side.
The diaper 300 includes an absorbent main body 310 and an exterior body 320 located on the non-skin side of the absorbent main body 310. The exterior body 320 includes a front side belt portion 321 positioned on the abdominal side of the wearer, a rear side belt portion 322 positioned on the back side of the wearer, and a crotch portion 323 connecting the front side belt portion 321 and the rear side belt portion 322.
Note that, although the exterior body 320 of the diaper 300 according to the present embodiment is configured by three members (the front side belt portion 321, the rear side belt portion 322, and the crotch portion 323), it is not limited thereto. For example, the front side belt portion 321, the back side belt portion 322, and the crotch portion 323 may be constituted by a single continuous member. In addition, the crotch portion 323 may be omitted.
When the diaper 300 is in the developed state shown in fig. 9, the front side belt portion 321 is located on one end side in the longitudinal direction of the absorbent main body 310, and the rear side belt portion 322 is located on the other end side in the longitudinal direction of the absorbent main body 310. When the absorbent main body 310 of the diaper 300 in the developed state is folded once at substantially the center in the longitudinal direction and both the left and right direction end portions of the front side belt portion 321 and both the left and right direction end portions of the rear side belt portion 322 are locked in the pair of locking portions 324, the pants-type state shown in fig. 8 is achieved. In other words, the longitudinal direction of the absorbent main body 310 coincides with the vertical direction of the diaper 300, and the front side belt portion 321 and the rear side belt portion 322 are connected in a loop-like manner, thereby forming the waistline opening 300a at the upper end and the pair of leg openings 300b on both sides in the left-right direction. Note that a locking method by the locking portion 324 is, for example, welding, bonding using an adhesive, or the like.
As shown in fig. 10, the absorbent main body 310 includes an absorbent core 311, a liquid-permeable front sheet 312 positioned on the skin side of the absorbent core 311, and a back sheet 313 positioned on the non-skin side of the absorbent core 311. The back sheet 313 of the present embodiment has a two-layer structure including a liquid-impermeable sheet 313a and a hydrophobic liquid-permeable sheet (e.g., a hydrophobic nonwoven fabric sheet) 313b disposed on the non-skin side of the liquid-impermeable sheet 313 a.
The absorbent core 311 is a member that absorbs and retains discharged liquid such as urine, for example, formed by liquid absorbent fibers such as pulp containing Super Absorbent Polymer (SAP). Although not shown, the outer peripheral surface of the absorbent core 311 may be covered with a liquid-permeable sheet made of tissue paper, nonwoven fabric, or the like.
As shown in fig. 9, the front side belt portion 321 and the rear side belt portion 322 respectively include waistline regions 3211 and 3221 as portions overlapping the lock portions 324 in the up-down direction and crotch regions 3212 and 3222 below the waistline regions 3211 and 3221.
The crotch regions 3212 and 3222 are generally trapezoidal in shape, and their lateral widths (lengths in the left-right direction) decrease toward the lower side. In addition, the crotch region 3222 of the rear side belt portion 322 is larger than the front side belt portion 321 so as to cover the hip region of the wearer.
As shown in fig. 10, the front belt portion 321 and the rear belt portion 322 respectively include skin side sheets 3213 and 3223, non-skin side sheets 3214 and 3224, and stretchable nonwoven fabric sheets 3215 and 3225 between the skin side sheets and the non-skin side sheets. The skin side sheets 3213 and 3223 and the non-skin side sheets 3214 and 3224 may be soft sheets made of spunbond nonwoven fabric, SMS nonwoven fabric, or the like. In addition, the skin side sheets 3213 and 3223 and the non-skin side sheets 3214 and 3224 are non-stretchable sheets which are not substantially stretched.
The stretchable nonwoven fabric sheets 3215 and 3225 are sheets stretchable at least in the lateral direction of the diaper 300. The stretchable nonwoven fabric sheets 3215 and 3225 are nonwoven fabric sheets containing stretchable fibers and non-stretchable fibers (i.e., stretchable fibers having a lower contractibility than that of the stretchable fibers).
As examples of the stretchable nonwoven fabric sheets 3215 and 3225, there can be provided a nonwoven fabric sheet made by subjecting stretchable fibers and non-stretchable fibers to an appropriate stretching treatment (e.g., gear stretching); the stretchable fiber is made of a polyurethane elastomer which is an elastic thermoplastic elastomer, and the non-stretchable fiber is made of a polyolefin resin such as polypropylene (PP) which is an inelastic thermoplastic resin. Note that the extension process may be an extension process performed in mutually orthogonal directions (the left-right direction and the up-down direction of the diaper 300) or an extension process performed only in a predetermined direction (the left-right direction of the diaper 300). Note that, in the case where the elongation processing is performed only in the predetermined direction, the stretchability is exhibited in the predetermined direction. But it is not necessarily the case that all the fibers are oriented in a predetermined direction, and thus the stretchability is also exhibited in a direction orthogonal to the predetermined direction.
The skin side sheets 3213(3223), the non-skin side sheets 3214(3224), and the stretchable nonwoven fabric sheets 3215(3225) are bonded to each other by the bonding portions 350 in a state where the stretchable nonwoven fabric sheets 3215 and 3225 are stretched in the left-right direction. As shown in fig. 11A, it is desirable that the bonded portions 350 are scattered in the left-right direction and the up-down direction of the diaper 300. According to this configuration, when the diaper 300 is contracted, the skin side sheets 3213 and 3223 and the portions of the non-skin side sheets 3214 and 3224 between the junctions 350 are gathered in such a manner as to form protrusions protruding outward in the thickness direction. On the other hand, the stretchable nonwoven fabric sheets 3215 and 3225 are expanded in the thickness direction due to the fact that: when the non-stretchable fibers are gathered (aggregated), the stretchable fibers contract. For this reason, the protrusions are supported by the fibers of the stretchable nonwoven fabric sheets 3215 and 3225 and are not easily collapsed, and the protrusions have high cushioning ability. This makes it possible to improve the texture of the front-side belt portion 321 and the rear-side belt portion 322 on the skin of the wearer. In addition, the user can be visually given the impression that the diaper 300 is soft.
The crotch portion 323 has a structure in which an extensible nonwoven sheet 3233 is disposed between a skin side sheet 3231 and a non-skin side sheet 3232, similarly to the front belt portion 321 and the rear belt portion 322. However, the configuration of the crotch portion 323 is not particularly limited thereto, and for example, the following configuration is possible: the skin side sheet 3231 is not provided, and an extensible nonwoven sheet 3233 is disposed between the absorbent main body 310 and the non-skin side sheet 3232.
Low pressure region 330 and high pressure region 340
Fig. 12 is a schematic plan view of the rear-side belt portion 322. Fig. 13 is a schematic plan view of the front side belt portion 321. Fig. 14A and 14B are explanatory views of the gluteus medius 360.
The front side belt portion 321 and the rear side belt portion 322 have a low pressure region 330 and a high pressure region 340 overlapping the lock portion 324 in the up-down direction in the waistline regions 3211 and 3221 (refer to fig. 9).
The low-pressure region 330 is a region where a stretchable nonwoven fabric sheet 3215(3225) is disposed between the skin side sheets 3213(3223) and the non-skin side sheets 3214 (3224). The high pressure region 340 is a region in which a stretchable nonwoven fabric sheet 3215(3225) and a stretchable film 343 are disposed between the skin side sheet 3213(3223) and the non-skin side sheet 3214 (3224). The stretchable film 343 is a sheet that stretches at least in the right-left direction of the diaper 300. Therefore, the low pressure region 330 and the high pressure region 340 have elasticity in the left-right direction.
The stretchable film 343 may be a sheet-shaped stretchable elastic member having a uniform thickness, and may be obtained, for example, by melting an elastomer resin such as polyurethane or styrene. The elastic film may be, for example, a film in which polyolefin layers are integrally formed on the upper and lower surfaces of the elastomer layer. If this type of stretchable film is used, it is considered that the polyolefin layer does not have stretchability, and therefore stretchability can be provided by stretching the film in advance. The provision of a polyolefin layer on the upper surface has the advantage of facilitating welding to a nonwoven sheet made of polyolefin fibres.
Due to the provision of the stretch film 343, the restriction pressure of the high pressure region 340 is higher than the restriction pressure of the low pressure region 330 when the diaper is worn. Specifically, the force required to elongate the unit length in the left-right direction of the vertical unit width portion of the high pressure region 340 is greater than the force required to elongate the unit length in the left-right direction of the vertical unit width portion of the low pressure region 330. In other words, the contraction force acting per unit width in the left-right direction in the high pressure region 340 is greater than the contraction force acting per unit width in the left-right direction in the low pressure region 330, and the high pressure region 340 strongly presses against the wearer.
Note that the stretchable membrane 343 is not limited to be disposed over the entire range of the high pressure region 340. For example, as shown in fig. 12 and 13, the stretchable films 343A to 343F and 343A to 343F extending in the left-right direction may be arranged side by side at intervals in the up-down direction. In this case, the high pressure region 340 is a region surrounded by the upper ends of the stretchable members (343A ) located at the uppermost position, the lower ends of the stretchable members (343F ) located at the lowermost position, and the pair of locking portions 324 among the plurality of stretchable members (here, the stretchable films 343) forming each high pressure region 340 (a region surrounded by 3A, 3b, 3c, and 3d in fig. 12, a region surrounded by 3e, 3F, 3g, and 3h in fig. 13).
In addition, the front side belt portion 321 and the back side belt portion 322 of the present embodiment are provided with the waistline elastic thread 326 at the upper end portion thereof, and are not provided with the stretchable nonwoven fabric sheets 3215 and 3225 and the stretchable film 343. In addition, the stretchable nonwoven fabric sheets 3215 and 3225 are disposed over the entire area under the waist elastic threads 326. However, not limited to this configuration, the following configuration is also possible: the stretchable nonwoven fabric sheets 3215 and 3225 are overlapped with the waist elastic threads 326 in the upper end portions of the front side belt portion 321 and the back side belt portion 322.
In addition, in the waistline region 3221 of the back side belt portion 322, an area below the high pressure region 340 is the low pressure region 330. However, in the waistline region 3211 of the front side belt portion 321, the region above the high pressure region 340 and below the waistline elastic thread 326 is the low pressure region 330. Note that if the back side belt portion 322 has the leg elastic threads 327, the low pressure region 330 does not include a portion provided with the leg elastic threads 327. Note that, in fig. 9 and 12, in order to facilitate understanding, the portion provided with the leg elastic threads 327 is surrounded by a thick line like the low-pressure region 330.
In addition, a known method may be used to compare the force required to elongate the unit length of the vertical unit width portion of the high pressure region 340 in the left-right direction with the force required to elongate the unit length of the vertical unit width portion of the low pressure region 330 in the left-right direction. For example, all of the high pressure region 340 and the low pressure region 330 are cut out from the back side band portion 322 and the front side band portion 321 as samples. Then, the average value of the vertical lengths of the samples was calculated. Then, both ends of each sample in the left-right direction of the diaper 300 were sandwiched in chucks of a tensile tester. Then, the sample was elongated by pulling the cartridge apart by a unit length, and the load at that time was measured. Then, the load of each sample was divided by the average vertical length of the sample, and the obtained value was used for comparison. Note that if an area including a portion where the leg elastic threads 327 are provided (an area indicated by a thick line in fig. 12) is cut out as the low pressure area 330 of the rear side belt portion 322, the load is measured in a state where no extension force is applied by the leg elastic threads 327.
In the following description, the low pressure region 330 and the high pressure region 340 of the rear side belt portion 322 are referred to as a "rear side low pressure region 331" and a "rear side high pressure region 341", respectively, and the low pressure region 330 and the high pressure region 340 of the front side belt portion 321 are referred to as a "front side low pressure region 332" and a "front side high pressure region 342", respectively.
As shown in fig. 9 and 12, the rear side high pressure region 341 continuously extends in the left-right direction between the pair of locking portions 324. If the end of the rear side high pressure region 341 is located at the edge portion of the leg opening 300b, the rear side high pressure region 341 widens the leg opening 300b when contracting, and the restraining pressure (contact pressure) of the rear side high pressure region 341 decreases. In contrast, in the present embodiment, the rear side high pressure region 341 is connected to the front side band portion 321 via the lock portion 324. This makes it possible to suppress a decrease in the restraining pressure of the rear side high pressure region 341.
Further, the vertical length of the rear high pressure region 341 is greater at both the left and right direction end portions 3411 of the rear high pressure region 341 than at the center portion 3412 (L31 > L32), and the lower end 341a of the rear high pressure region 341 is located lower at the end portions 3411 than at the center portion 3412.
In other words, as shown in fig. 14A, the rear side high pressure region 341 is configured to conform to the shape of the gluteus medius 360 of the wearer (human body). Accordingly, the rear side high pressure region 341 can restrain the gluteus medius muscle 360 of the wearer and can support the movement of the gluteus medius muscle 360 when the diaper 300 is worn. As a result, the pelvis of the wearer is stabilized during movement such as walking, and the movement (walking) of the wearer can be supported.
Note that it is sufficient that the positional relationship and the vertical lengths (L31, L32) of the lower end (341a) described above are satisfied at least at both ends and the center in the horizontal direction of the rear high pressure region 341. It is preferable that these conditions be satisfied in both end portions 3411 extending from both ends in the left-right direction of the rear high pressure region 341 by the length of 1/3 of the total length and the central portion 3412 therebetween.
In addition, it is desirable to compare the length and position of the rear high pressure region 341 in a state where the rear belt portion 322 is elongated to eliminate wrinkles. Specifically, this is a state in which the rear side belt portion 322 is such that the size of the constituent member (e.g., the skin side sheet 3223, etc.) of the rear side belt portion 322 matches or approximates to the size thereof in the independent state. Similarly, this applies to the comparison of other lengths and positions described later.
In addition, in the left-right direction central portion of the rear side belt portion 322, the rear side low pressure region 331 is disposed adjacent to the lower side of the rear side high pressure region 341. Specifically, it is desirable that the rear low pressure region 331 is located at least in the center in the left-right direction of the rear belt portion 322, and it is preferable that the rear low pressure region 331 is located in the center between both end portions of a length 1/3 extending in total length from both ends in the left-right direction of the rear belt portion 322.
As shown in fig. 14A, only the gluteus maximus 361 (which does not overlap with the gluteus medius 360) is located in the central portion of the hip region of the wearer (human body). During exercise such as sitting and walking, only the central portion of the hip region where the gluteus maximus 361 is located greatly expands and contracts. For this reason, if the rear side high pressure region 341 is located at the central portion of the hip region, friction is likely to occur between the wearer and the diaper 300, and the comfort of the diaper 300 is reduced. In contrast, in the present embodiment, the rear low pressure region 331 is arranged to be aligned with the central portion of the hip region. For this reason, the central portion of the hip region where skin and muscles largely stretch is not excessively restrained, and friction between the wearer and the diaper 300 can be reduced, and the comfort of the diaper 300 can be improved.
In addition, the rear low pressure region 331 can be appropriately fitted at the central portion of the hip region due to the stretchability and can suppress the displacement of the diaper 300. As a result, the state in which the rear high-pressure region 341 is in contact with the gluteus medius is maintained, and support for the wearer's movement (walking support) is maintained.
Further, the lower end 341a of the rear high pressure region 341 is preferably inclined downward from the left-right direction central portion 3412 of the rear high pressure region 341 toward both end portions 3411. In other words, the vertical length of the rear high pressure region 341 preferably gradually increases from the left-right direction center portion 3412 of the rear high pressure region 341 toward both end portions 3411.
According to this configuration, the shape of the rear side high pressure region 341 more closely conforms to the shape of the gluteus medius 360 of the wearer (fig. 14A). Therefore, this improves the ability of the rear high pressure region 341 to support the gluteus medius 360, that is, the ability to support the wearer's movement (the ability to support walking). Note that although in the example shown in fig. 12, the lower end 341a of the rear side high pressure region 341 is inclined in a smooth curve, it is not limited thereto, and the lower end 341a may be inclined in a linear shape or a stepped shape, for example.
Further, the rear high pressure region 341 is preferably arranged so as not to overlap the rear portion of the absorbent core 311 in the front-rear direction (the thickness direction of the rear belt portion 322). According to this configuration, it is possible to suppress a situation in which the rear side high pressure region 341 having a strong contractive force contracts the absorbent core 311 in the left-right direction and forms an uneven shape in the thick absorbent core 311. In other words, the flatness of the absorbent core 311 is maintained to prevent discomfort during use, so that the comfort of the diaper 300 can be improved. Note that the rear side portion of the absorbent core 311 is a portion located on the rear side (back side) of the longitudinal direction center of the absorbent core 311. The above configuration is not limited, and the rear side high pressure region 341 and the absorbent core 311 may overlap each other.
Further, the rear low pressure region 331 is preferably disposed at least between the lower end 341a of the rear high pressure region 341 and the upper end 311a of the rear portion of the absorbent core 311. According to this configuration, the rear low pressure region 331 can appropriately fit a wide range of the gluteus maximus of the wearer. This makes it possible to suppress displacement of the diaper 300 when worn.
Further, it is desirable that the rear low pressure region 331 extends in the left-right direction not only in the left-right direction center portion of the rear belt portion 322 but also in at least a part of both end portions. Specifically, having both end portions as portions extending from both left and right direction ends of the rear side belt portion 322 by the length of 1/3 of the total length, it is desirable that the rear side low pressure region 331 extends to at least a part of both end portions. More preferably, the rear low pressure region 331 extends between the pair of locking portions 324. According to this configuration, the rear low pressure region 331 can appropriately fit a wide range of the gluteus maximus of the wearer.
In addition, as shown in fig. 13, it is desirable that the stretchable membrane 343 (front stretchable member) of the front high-pressure region 342 continuously extends in the left-right direction between the pair of locking portions 324. Desirably, the rear side high pressure region 341 is connected to the front side high pressure region 342 in the lock portion 324. In other words, it is desirable that the positions of the rear side high pressure region 341 and the front side high pressure region 342 are partially or completely aligned with each other in the up-down direction in the lock portion 324.
According to this configuration, an annular expansion region is formed by the rear side high pressure region 341 and the front side high pressure region 342. Therefore, the diaper 300 fits around the waist of the wearer, and displacement of the diaper 300 can be suppressed. In addition, the restraining pressure of the rear high pressure region 341 is increased, thereby improving the ability of the rear high pressure region 341 to support the gluteus medius 360.
In the rear high pressure region 341 and the front high pressure region 342 of the present embodiment, the stretchable membranes 343A to 343F (rear stretchable members) and 343A to 343F (front stretchable members) are arranged side by side at an interval in the up-down direction. In this case, it is desirable that, in the locking part 324, the highest stretchable films 343A and 343A are connected to each other and the lowest stretchable films 343F and 343F are connected to each other. This configuration achieves the above-described effects. It is preferable that the second stretchable films 343B and 343B from the top, the third stretchable films 343C and 343C from the top, the fourth stretchable films 343D and 343D from the top, and the fifth stretchable films 343E and 343E from the top are also connected to each other in the locking part 324.
Note that the above configuration is not limited, and the rear side high pressure region 341 and the front side high pressure region 342 (front side stretchable member) may be misaligned in the up-down direction in the lock portion 324. In addition, a configuration is possible in which the front side band portion 321 does not include the high pressure region 340 or does not include the stretchable member. For example, the front side belt portion 321 may have a structure in which the stretchable film 343 is not provided and only the stretchable nonwoven fabric sheet 3215 is provided. In addition, a thread-like elastic member such as an elastic thread may be provided instead of the stretchable film 343 or the stretchable nonwoven fabric sheet 3215. In these cases, it is also desirable that the stretchable nonwoven fabric sheet 3215 or the pair of linear elastic members extend continuously in the left-right direction between the paired locking portions 324 and are connected to the rear side high pressure region 341 in the locking portions 324. This configuration achieves the above-described effects.
In addition, as shown in fig. 14B, the gluteus medius 360 extends from the back side to the side of the human body. For this reason, as shown in fig. 13, it is desirable that the up-down length of the front side high pressure region 342 is larger in both left and right direction end portions 3421 of the front side high pressure region 342 than in the central portion 3422 (L33> L34), and that the upper end 342a of the front side high pressure region 342 is located higher in the end portions 3421 than in the central portion 3422.
In this way, if the left and right direction both end portions 3421 of the front side high pressure region 342 are located at relatively high positions and have a long length in the up and down direction (L33), the front side high pressure region 342 can be brought into close contact with the gluteus medius in the side regions of the wearer. For this reason, a wide range of gluteus medius of the wearer can be restrained by the rear side high pressure region 341 and the front side high pressure region 342. This therefore improves the ability to support the movement of the wearer (the ability to support walking).
On the other hand, the left-right direction central portion 3422 of the front side high pressure region 342 is located at a relatively low position, and is located below the ridge of the abdominal region of the wearer. For this reason, the wearer's abdominal region is not excessively restrained by the front side high pressure region 342, so that the comfort of the diaper 300 can be improved.
Note that it is sufficient that the positional relationship between the above-described vertical lengths (L33, L34) and the upper end (342a) is satisfied at least at both ends and the center in the left-right direction of the front side high pressure region 342. It is preferable that these conditions are satisfied in both end portions 3421 of the length of 1/3 extending in total length from both ends in the left-right direction of the front side high pressure region 342 and the central portion 3422 therebetween. However, the shape of the front side high pressure region 342 is not limited to the above description.
In the center portion in the left-right direction of the front belt portion 321, the front low-pressure region 332 is disposed adjacent to the upper side of the front high-pressure region 342. Specifically, it is sufficient that the front low-pressure region 332 is located at least at the left-right direction center of the front belt portion 321, and it is preferable that the front low-pressure region 332 is located at the center between both ends of the length 1/3 extending the total length from both left-right direction ends of the front belt portion 321. According to this configuration, the front side low pressure region 332 can be appropriately fitted to the abdominal region of the wearer, and displacement of the diaper 300 can be suppressed.
Further, it is preferable that the front side high pressure region 342 is disposed so as not to overlap with the front side portion of the absorbent core 311 in the front-rear direction. According to this configuration, it is possible to suppress the front side high pressure region 342 from contracting the absorbent core 311 in the left-right direction. Accordingly, the flatness of the absorbent core 311 is maintained to prevent discomfort during use, so that the comfort of the diaper 300 can be improved. Note that the front portion of the absorbent core 311 is a portion located on the front side (ventral side) of the longitudinal center of the absorbent core 311. The above configuration is not limited, and the front side high pressure region 342 and the absorbent core 311 may overlap each other.
In addition, it is preferable that the stretchable membranes 343A to 343F and 343A to 343F provided in the rear side high pressure region 341 and the front side high pressure region 342 are arranged side by side at intervals in the up-down direction. The portion between the stretchable films 343 adjacent in the up-down direction has fewer sheet layers than the portion provided with the stretchable films 343, and thus has better air permeability in the thickness direction. Therefore, the moist air in the diaper 300 can be discharged to the non-skin side in the thickness direction through the portion between the adjacent stretchable films 343, and the vapor in the diaper 300 can be suppressed. Thus, the comfort of the diaper 300 may be improved.
In particular, the air permeability in the thickness direction is lower in the case where the high-pressure region 340 includes the stretchable film 343 than in the case where a stretchable nonwoven fabric sheet or a thread-like elastic member is included. For this reason, it is desirable that the plurality of stretchable films 343 be arranged side by side at intervals in the vertical direction. Note that the above configuration is not limited, and the stretchable membrane 343 may be provided over the entire range of the high pressure region 340.
In addition, in the rear side high pressure region 341 and the front side high pressure region 342, it is desirable that gaps (lengths in the up-down direction) between the stretchable films 343A to 343F and 343A to 343F adjacent in the up-down direction are larger in the left-right direction end portions 3411 and 3421 than in the central portions 3412 and 3422. According to this configuration, the vertical direction lengths of the both left and right direction end portions 3411 and 3421 are longer in the rear side high pressure region 341 and the front side high pressure region 342 than in the central portions 3412 and 3422 (L31 > L32, L33> L34). Therefore, the rear high pressure region 341 and the front high pressure region 342 can fit around the gluteus medius.
Further, the stretchable members (here, the stretchable membrane 343) disposed in the rear high-pressure region 341 and the front high-pressure region 342 are preferably sheet-shaped stretchable members.
According to this configuration, the rear side high pressure region 341 and the front side high pressure region 342 lie flat against the gluteus medius of the wearer, and therefore a wide range of the gluteus medius of the wearer can be restrained. This therefore improves the ability to support the movement of the wearer (the ability to support walking). Further, if it is intended to obtain a substantially same restraining pressure as that of the sheet-like stretchable member by using the linear elastic member, it is necessary to increase the elongation of the linear elastic member. In this case, the thread-like elastic members are locally brought into close contact with the wearer, thereby reducing the comfort of the diaper 300.
Similarly, it is preferable that the stretchable members (here, the stretchable nonwoven fabric sheets 3215 and 3225) arranged in the rear low pressure region 331 and the front low pressure region 332 are also sheet-shaped stretchable members. According to this configuration, the rear low pressure region 331 and the front low pressure region 332 flatly abut against the abdominal region and gluteus maximus of the wearer, thereby preventing local restraint of the abdominal region and gluteus maximus and making it possible to improve the comfort of the diaper 300. Note that a configuration in which a stretchable nonwoven sheet is provided in place of the stretchable film 343 and two layers of stretchable nonwoven sheets are provided in the high-pressure region 340 is possible.
Note that the above configuration is not limited. For example, the following configuration is possible: the low pressure region 330 is formed by arranging linear elastic members in parallel at intervals in the vertical direction in a wide range of the front belt portion 321 and the rear belt portion 322, and the high pressure region 340 is formed by arranging another stretchable member (for example, a stretchable film, a stretchable nonwoven fabric sheet, a linear elastic member, or the like) in an overlapping manner on the linear elastic members. In comparison, the following configuration is possible: the low-pressure region 330 is formed by disposing a sheet-like stretchable member (for example, a stretchable film or a stretchable nonwoven fabric sheet) over a wide range of the front belt portion 321 and the rear belt portion 322, and the high-pressure region 340 is formed by disposing a linear elastic member on the sheet-like stretchable member in an overlapping manner. In addition, the following configuration is possible: the low-pressure region 330 is formed by arranging the stretchable membrane in a wide range of the front belt portion 321 and the rear belt portion 322, and the high-pressure region 340 is formed by arranging a sheet-shaped stretchable member (for example, a stretchable membrane or a stretchable nonwoven fabric sheet) on the stretchable membrane in an overlapping manner. Further, the following configuration is possible: the low pressure region 330 and the high pressure region 340 have the same configuration, and the elongation rate of the stretchable member in the high pressure region 340 is set higher than that in the low pressure region 330.
In addition, it is desirable that the leg elastic threads 327 (stretchable members) are configured to extend along the pair of leg openings 300b of the diaper 300. According to this configuration, the leg elastic threads 327 are brought into close contact with the legs of the wearer (the contour portions of the hip region), whereby the diaper 300 can be suppressed from being pulled too high when being put on or worn. As a result, the rear side high pressure region 341 is maintained against the gluteus medius, and support of the wearer's movement (walking support) is maintained. Note that a sheet-like stretchable member may be disposed so as to extend along the leg opening 1b instead of the elastic thread. In addition, the above configuration is not limited, and the stretchable member extending along the leg opening 1b may be omitted.
In the third embodiment, the first and second embodiments are described below
A third embodiment of a pants-type disposable diaper will be described below taking as an example a pants-type disposable diaper for adults. However, the pants-type disposable diaper of the present invention is not limited to this, and can be applied to a disposable diaper for children (babies), sanitary pants, and the like.
Basic Structure of diaper 500
Fig. 15 is a schematic perspective view of a pants-type disposable diaper 500 (hereinafter, also referred to as a diaper 500). Figure 16 is a schematic plan view of a diaper 500 in an unfolded and extended state. Fig. 17 is a schematic sectional view taken along a line I-I (center in the left-right direction) in fig. 16. Fig. 18A is a diagram illustrating an example of a joint 530 of the front side belt portion 521 and the rear side belt portion 522, and fig. 18B is a schematic sectional view of the front side belt portion 521 and the rear side belt portion 522.
The diaper 500 has an up-down direction, a left-right direction, and a front-back direction that intersect each other, and has a thickness direction in which members overlap each other as shown in fig. 17. In the up-down direction, the side corresponding to the torso of the wearer is the upper side, and the side corresponding to the crotch of the wearer is the lower side. In the front-rear direction, the side corresponding to the abdomen of the wearer is the front side, and the side corresponding to the back side of the wearer is the rear side. In the thickness direction, the side in contact with the wearer is the skin side, and the opposite side is the non-skin side.
The diaper 500 includes an absorbent main body 510 and an exterior body 520 positioned on the non-skin side of the absorbent main body 510. The outer package 520 includes a front side belt portion 521 (belt portion) positioned on the abdominal side of the wearer, a rear side belt portion 522 (belt portion) positioned on the back side of the wearer, and a crotch portion 523 connecting the front side belt portion 521 and the rear side belt portion 522.
Note that, although the outer package 520 of the diaper 500 according to the present embodiment is configured by three members (the front side belt portion 521, the rear side belt portion 522, and the crotch portion 523), it is not limited thereto. For example, the front side belt portion 521, the back side belt portion 522 and the crotch portion 523 may be constituted by a single continuous member. In addition, the crotch portion 523 may be omitted.
When the diaper 500 is in the developed state shown in fig. 16, the front side belt portion 521 is located on one end side in the longitudinal direction of the absorbent main body 510, and the back side belt portion 522 is located on the other end side in the longitudinal direction of the absorbent main body 510. When the absorbent main body 510 of the diaper 500 in the developed state is folded once at substantially the center in the longitudinal direction and both the left and right direction ends of the front side belt portion 521 and the left and right direction ends of the rear side belt portion 522 are locked in the pair of locking portions 524, the pants-type state shown in fig. 15 is achieved. In other words, the longitudinal direction of the absorbent main body 510 coincides with the vertical direction of the diaper 500, and the front side belt portion 521 and the rear side belt portion 522 are connected in a loop-like manner, so that the waistline opening 500a is formed at the upper end and the pair of leg openings 500b are formed at both sides in the left-right direction. Note that a locking method by the locking portion 524 is, for example, welding, bonding using an adhesive, or the like.
As shown in fig. 17, the absorbent main body 510 includes an absorbent core 511, a liquid-permeable front sheet 512 positioned on the skin side of the absorbent core 511, and a back sheet 513 positioned on the non-skin side of the absorbent core 511. The back sheet 513 of the present embodiment has a two-layer structure including a liquid-impermeable sheet 513a and a hydrophobic liquid-permeable sheet (for example, a hydrophobic nonwoven fabric sheet) 513b arranged on the non-skin side of the liquid-impermeable sheet 513 a.
The absorbent core 511 is a member that absorbs and retains excretory fluid such as urine, for example, formed by liquid absorbent fibers such as pulp containing Super Absorbent Polymers (SAP). Although not shown, the outer peripheral surface of the absorbent core 511 may be covered with a liquid-permeable sheet made of tissue paper, nonwoven fabric, or the like.
As shown in fig. 16, the front side belt portion 521 and the rear side belt portion 522 respectively include waistline regions 5211 and 5221 as portions overlapping the lock portions 524 in the up-down direction and crotch regions 5212 and 5222 below the waistline regions 5211 and 5221.
The crotch regions 5212 and 5222 are generally trapezoidal in shape, and their lateral widths (lengths in the left-right direction) decrease toward the lower side. In addition, the crotch region 5222 of the back side belt portion 522 is larger than the front side belt portion 521 so as to cover the hip region of the wearer.
As shown in fig. 17, the front belt portion 521 and the rear belt portion 522 include skin side sheets 5213 and 5223, non-skin side sheets 5214 and 5224, respectively, and stretchable nonwoven fabric sheets 5215 and 5225 interposed between the skin side sheets and the non-skin side sheets. The skin side sheets 5213 and 5223 and the non-skin side sheets 5214 and 5224 may be soft sheets made of spunbond nonwoven fabric, SMS nonwoven fabric, or the like. In addition, the skin side sheets 5213 and 5223 and the non-skin side sheets 5214 and 5224 are non-stretchable sheets that are substantially non-stretchable.
The stretchable nonwoven sheets 5215 and 5225 are sheets stretchable at least in the lateral direction of the diaper 500. The stretchable nonwoven sheets 5215 and 5225 are nonwoven sheets comprising stretchable fibers and non-stretchable fibers (i.e., stretchable fibers having a lower contractility than the stretchable fibers).
As examples of the stretchable nonwoven sheets 5215 and 5225, there can be provided a nonwoven sheet made by subjecting stretchable fibers and non-stretchable fibers to an appropriate stretching treatment (e.g., gear stretching); the stretchable fiber is made of a polyurethane elastomer which is an elastic thermoplastic elastomer, and the non-stretchable fiber is made of a polyolefin resin such as polypropylene (PP) which is an inelastic thermoplastic resin. Note that the extension process may be an extension process performed in mutually orthogonal directions (the left-right direction and the up-down direction of the diaper 500) or an extension process performed only in a predetermined direction (the left-right direction of the diaper 500). Note that, in the case where the elongation processing is performed only in the predetermined direction, the stretchability is exhibited in the predetermined direction. But it is not necessarily the case that all the fibers are oriented in a predetermined direction, and thus the stretchability is also exhibited in a direction orthogonal to the predetermined direction.
The skin side sheets 5213(5223), the non-skin side sheets 5214(5224), and the stretchable nonwoven fabric sheets 5215(5225) are joined by the joining portions 530 in a state where the stretchable nonwoven fabric sheets 5215 and 5225 are stretched in the left-right direction. As shown in fig. 18A, it is desirable that the bonded portions 530 are scattered in the left-right direction and the up-down direction of the diaper 500. According to this configuration, when the diaper 500 is contracted, the skin side sheets 5213 and 5223 and the portions of the non-skin side sheets 5214 and 5224 between the bonded portions 530 are gathered in such a manner as to form protruding portions that protrude outward in the thickness direction. On the other hand, the stretchable nonwoven sheets 5215 and 5225 are expanded in the thickness direction due to the fact that: when the non-stretchable fibers are gathered (aggregated), the stretchable fibers contract. For this reason, the protrusions are supported by the fibers of the stretchable nonwoven fabric sheets 5215 and 5225 and are not easily collapsed, and the protrusions have high cushioning ability. This makes it possible to improve the texture of the front-side belt portion 521 and the rear-side belt portion 522 on the skin of the wearer. In addition, the user may be visually given the impression that the diaper 500 is soft.
The crotch portion 523 has a structure in which an extensible nonwoven sheet 5233 is disposed between the skin side sheet 5231 and the non-skin side sheet 5232, similarly to the front side belt portion 521 and the rear side belt portion 522. However, the configuration of the crotch portion 523 is not particularly limited thereto, and for example, the following configuration is possible: the skin side sheet 5231 is not provided, and an extensible nonwoven sheet 5233 is disposed between the absorbent main body 510 and the non-skin side sheet 5232.
High pressure zone 560
Fig. 19 is a schematic plan view of the front side belt portion 521. Fig. 20 is a schematic plan view of the rear-side belt portion 522.
The front side belt portion 521 and the rear side belt portion 522 include a waistline stretch region 540, a low pressure region 550, and a high pressure region 560 in the waistline regions 5211 and 5221 overlapping the lock portion 524 in the up-down direction.
The waistline stretch zone 540 is a stretch zone extending along the edge of the waistline opening 500a and is formed by elastic threads 541 which stretch in the left-right direction of the diaper 500 and are arranged side by side at intervals in the up-down direction. The waist elastics 540 may be formed not to include the stretch nonwoven sheets 5215 and 5225 shown in fig. 17, or may include the stretch nonwoven sheets and the elastic threads 541 (not shown) overlapped with each other.
The low pressure region 550 and the high pressure region 560 are regions disposed below the waistline stretch region 540, are adjacent to each other, and have stretchability in the left-right direction. The low-pressure region 550 is a region where the stretchable nonwoven sheets 5215 and 5225 are arranged between the skin side sheets 5213 and 5223 and the non-skin side sheets 5214 and 5224. The high pressure regions 560 are regions where the stretchable nonwoven sheets 5215 and 5225 and the stretchable film 565 are disposed between the skin side sheets 5213 and 5223 and the non-skin side sheets 5214 and 5224. The stretchable film 565 is a sheet stretchable at least in the right-left direction of the diaper 500.
The stretchable film 565 may be a sheet-shaped stretchable elastic member having a uniform thickness, for example, the stretchable film 565 may be obtained by melting an elastomer resin such as polyurethane or styrene. For example, the elastic film may be a film in which polyolefin layers are integrally formed on the upper and lower surfaces of the elastomer layer. If this type of stretch film is used, the stretch is provided by stretching the film in advance, considering that the polyolefin layer does not have stretch. The provision of a polyolefin layer on the upper surface has the advantage of facilitating welding to a nonwoven sheet made of polyolefin fibres.
Due to the provision of the stretchable membrane 565, the restriction pressure of the high pressure region 560 is greater than the restriction pressure of the low pressure region 550 when the diaper is worn. Specifically, the force required to elongate the unit length of the vertical unit width portion of the high pressure region 560 in the left-right direction is greater than the force required to elongate the unit length of the vertical unit width portion of the low pressure region 550 in the left-right direction. In other words, the contraction force acting per unit width in the left-right direction in the high pressure region 560 is larger than the contraction force acting per unit width in the left-right direction in the low pressure region 550, and the high pressure region 560 strongly presses against the wearer.
Note that the stretchable membrane 565 is not limited to be disposed over the entire range of the high pressure region 560. For example, as shown in fig. 19 and 20, the stretchable films 565A to 565F and 565A to 565F extending in the left-right direction may be arranged side by side at intervals in the up-down direction. In this case, each high pressure region is a region surrounded by the upper end of the stretchable membrane 565 located at the highest position, the lower end of the stretchable membrane 565 located at the lowest position, and the pair of locking parts 524 among the plurality of stretchable membranes 565 arranged at the same portion (same track).
More specifically, as shown in fig. 19, the front side belt portion 521 includes a "first high-pressure region 561" (a region surrounded by 5a, 5b, 5c, and 5 d) and a "second high-pressure region 562" (a region surrounded by 5e, 5f, 5g, and 5 h), the "first high-pressure region 561" includes three stretchable films 565a to 565c forming a downwardly protruding shape, and the "second high-pressure region 562" includes three stretchable films 565d to 565f horizontally in the left-right direction of the diaper 500.
In addition, as shown in fig. 20, the rear side belt portion 522 includes a "third high pressure region 563" (a region surrounded by 5i, 5j, 5k, and 5 l) and a "fourth high pressure region 564" (a region surrounded by 5m, 5n, 5o, and 5 p), "the third high pressure region 563" includes three stretchable films 565A to 565C forming an upwardly protruding shape, and "the fourth high pressure region 564" includes three stretchable films 565D to 565F horizontally in the left-right direction of the diaper 500.
In the front side belt portion 521 and the back side belt portion 522 of the present embodiment, the stretchable nonwoven fabric sheets 5215 and 5225 are disposed over the entire area below the hip stretch region 540 (see fig. 17). For this reason, one low pressure region 550 includes the waistline region 5211 of the front side belt portion 521 and the region other than the first high pressure region 561 and the second high pressure region 562 in the region below the waistline stretch region 540. Similarly, the other low-pressure region 550 includes the waistline region 5221 of the back side belt portion 522 and regions other than the third high-pressure region 563 and the fourth high-pressure region 564 in the region below the waistline stretch region 540. Note that if the front side belt portion 521 and the rear side belt portion 522 include the leg elastic threads 527 extending along the leg openings 500b, the low-pressure region 550 does not include a portion provided with the leg elastic threads 527.
Note that the force required to elongate the up-down direction unit width portion of the high pressure region 560 by the unit length in the left-right direction and the force required to elongate the up-down direction unit width portion of the low pressure region 550 by the unit length in the left-right direction may be compared using a known method. For example, all or part of the high pressure area 560 and the low pressure area 550 are cut out from the back side belt portion 522 and the front side belt portion 521 as samples. Then, the average value of the vertical lengths of the samples was calculated. Then, both ends of each sample in the left-right direction of the diaper 500 were sandwiched in chucks of a tensile tester. Then, the sample was elongated by pulling the cartridge apart by a unit length, and the load at that time was measured. Then, the load of each sample was divided by the average vertical length of the sample, and the obtained value was used for comparison. Note that if an area including a portion provided with the leg elastic threads 527 is cut out as the low-pressure area 550, the load is measured in a state where the leg elastic threads 527 exert no elongation force.
In addition, it is sufficient that the restriction pressure of the high pressure region 560 is higher than that of the low pressure region 550, and the configuration in which the stretchable film 565 is overlapped with the stretchable nonwoven fabric sheets 5215 and 5225 is not limited. For example, the following configuration is possible: the low pressure region 550 is formed by disposing linear elastic members in parallel at intervals in the vertical direction in a wide range of the front belt portion 521 and the rear belt portion 522, and the high pressure region 560 is formed by disposing another stretchable member (for example, a stretchable film, a stretchable nonwoven fabric sheet, a linear elastic member, or the like) in an overlapping manner on the linear elastic members. In comparison, the following configuration is possible: the low pressure region 550 is formed by disposing a sheet-like stretchable member (for example, a stretchable film or a stretchable nonwoven fabric sheet) over a wide range of the front belt portion 521 and the rear belt portion 522, and the high pressure region 560 is formed by disposing a linear elastic member on the sheet-like stretchable member in an overlapping manner. In addition, the following configuration is possible: the low pressure region 550 is formed by arranging the stretchable membrane in a wide range of the front belt portion 521 and the rear belt portion 522, and the high pressure region 560 is formed by arranging a sheet-shaped stretchable member (for example, a stretchable membrane or a stretchable nonwoven fabric sheet) on the stretchable membrane in an overlapping manner. Further, the following configuration is possible: the low pressure region 550 and the high pressure region 560 have the same configuration, and the elongation ratio of the stretchable member in the high pressure region 560 is set to be higher than that of the stretchable member in the low pressure region 550.
As described above, the high pressure region 560 is provided in the portions of the front side band portion 521 and the rear side band portion 522. To this end, the high pressure zone 560 may restrain portions of the wearer that are desired to be restrained (e.g., portions that prevent the diaper 500 from slipping down and portions that support movement of the wearer). The low pressure region 550 also has elasticity. For this reason, the low-pressure region 550 may be appropriately brought into close contact with an undesired portion of the wearer. Thus, the fit of the diaper 500 may be improved while also preventing over-restraint of the wearer.
In the diaper 500 of the present embodiment, the skin side sheets 5213 and 5223, the non-skin side sheets 5214 and 5224, and the stretchable nonwoven fabric sheets 5215 and 5225 are white sheets, and the stretchable film 565 is a colored sheet (for example, a sheet colored in purple, blue, pink, or the like). In other words, the color of the stretch film 565 is different from the color of the other sheets. According to this configuration, when the front side belt portion 521 and the rear side belt portion 522 are viewed from at least one of the non-skin side and the skin side, the color of the portion of the high-pressure region 560 including the stretchable film 565 is different from the color of the low-pressure region 550.
By making the high pressure zone 560 visible in this manner, the user (wearer or caregiver) of the diaper 500 can identify the location of the high pressure zone 560 on the diaper 500. To this end, the user may check whether the high pressure region 560 is located in the portion of the wearer to be restrained while adjusting the pulled-up position of the diaper 500. Thus, the diaper 500 is properly put on the wearer in place, and the effect of the high pressure region 560 (prevention of slipping down of the diaper 500, support of wearer movement, etc.) is obtained. It is also possible to prevent the comfort of the diaper 500 from being reduced by the high pressure regions 560 being located in the wearer's parts that are not to be restrained (e.g., the hump and the lower abdomen regions of the hip region).
More preferably, when the front side belt portion 521 and the back side belt portion 522 are viewed from at least one of the non-skin side and the skin side, the color of the contour portion of the high pressure region 560 is different from the color of the low pressure region 550 in the up-down direction of the diaper 500. For example, in the case of the first high pressure region 561 of the front side belt 521, the colored stretchable film 565a is located at the upper end portion, and the colored stretchable film 565c is located at the lower end portion. In the second to fourth high pressure regions 562 to 564, the colored stretchable film 565 is also similarly located at the upper and lower ends.
According to this configuration, the boundary between the high pressure region 560 and the low pressure region 550 is clear, and the user can more easily recognize the location of the high pressure region 560. Thus, the diaper 500 is easily properly fitted in place on the wearer.
Note that it is sufficient that the color of at least a part of the high pressure region 560 is different from the color of the low pressure region 550, and a part of the high pressure region 560 other than the outline portion may have a different color, or the entire high pressure region 560 may have a different color. In addition, the coloring of the high pressure region 560 is not limited. In other words, the following configuration is possible: the material constituting the high pressure area 560 is white, and the material constituting the low pressure area 550 is colored. In addition, the high pressure region 560 and the low pressure region 550 may be different colors from each other, other than white.
Fig. 21 is a table showing the experimental results regarding the visibility of the high pressure region 560. Experiments were performed for the following cases: to identify the location of the high pressure area 560, the degree of color difference between the high pressure area 560 and the low pressure area 550 is required. First, samples 1 to 6 having different configurations of the belt portions were prepared. Samples 1 to 6 had the following configuration.
In sample 1, the basis weight was 27g/m2As the skin side sheets 5213 and 5223 and the non-skin side sheets 5214 and 5224. The basis weights of the stretchable nonwoven sheets 5215 and 5225 are 28g/m2And the elongation magnification was 2.3. Further, a dark beige stretchable film 565 is disposed in a portion between the non-skin side sheets 5214 and 5224 and the stretchable nonwoven fabric sheets 5215 and 5225. The stretchable membrane 565 is configured as shown in fig. 16 (this applies similarly to the other samples as well).
The construction of sample 2 was the same as that of sample 1, except that the color of the stretch film 565 was pale beige.
In sample 3, the basis weight was 20g/m2As the skin side sheets 5213 and 5223 and the non-skin side sheets 5214 and 5224. The basis weights of the stretchable nonwoven sheets 5215 and 5225 are 28g/m2And the elongation magnification was 2.3. Further, a dark beige stretchable film 565 is disposed in a portion between the non-skin side sheets 5214 and 5224 and the stretchable nonwoven fabric sheets 5215 and 5225.
The construction of sample 4 was the same as that of sample 3, except that the color of the stretchable film 565 was pale beige.
In sample 5, a basis weight of 19g/m was used2And a spunbonded nonwoven sheet containing a lower amount of white pigment (titanium oxide) than in samples 1 to 4 was used as the skin side sheets 5213 and 5223 and the non-skin side sheets 5214 and 5224. The basis weights of the stretchable nonwoven sheets 5215 and 5225 are 28g/m2And the elongation magnification was 2.3. Further, a dark beige stretchable film 565 is disposed in a portion between the non-skin side sheets 5214 and 5224 and the stretchable nonwoven fabric sheets 5215 and 5225.
The construction of sample 6 was the same as that of sample 5, except that the color of the stretchable film 565 was pale beige.
Then, the subject was tested to evaluate whether the high pressure region 560 and the low pressure region 550 could be discriminated when the samples 1 to 6 were observed from the skin side and the non-skin side. Note that the test subjects evaluated samples 1 to 6 in a state of being worn on a doll of an appropriate size. The evaluation is performed in three levels, i.e., "(good) indicating a case where the high pressure region 560 and the low pressure region 550 can be discriminated," (general) indicating a case where they can be discriminated but with some difficulty, and "×" (poor) indicating that they cannot be discriminated. Since the diaper 500 is an adult diaper, the test subjects (a to E) were five adult males/females aged 30 to 50. The experiment was performed in a room (with an illuminance of 407Lx) illuminated with a fluorescent lamp, and the test object was separated from the samples 1 to 6 by a horizontal distance of 40 cm.
In addition, the color difference Δ E between the high pressure region 560 and the low pressure region 550 was measured for each of the samples 1 to 6 when viewed from the skin side and the non-skin side.
The color difference Δ E was measured using a color difference meter (here, a colorimeter/color difference meter ZE-6000 manufactured by japan electro-chromatic industries co.). Reflection measurements were made and the sample opening diameter was 30 mm. First, the measurement target sample (belt portion of diaper 500) is left in a natural state. In the case where the color difference Δ E is measured from the non-skin side, the non-skin side of the sample is configured to face upward during the measurement, and in the case where the color difference Δ E is measured from the skin side, the skin side of the sample is configured to face upward during the measurement.
The measurements are taken at random locations (here five locations) in the high pressure zone 560 to obtain measurements (a and b in a laxb color system). The average of the measurements of the locations is used as the measurement of this high pressure region 560. Similarly, random positions (here five positions) at the low-pressure region 550 are measured to obtain measurement results (a x value and b x value). The average of the measurements of the positions is used as the measurement of the low-pressure area 550.
In addition, in the case where the color of only a part of the high pressure region 560 (the part where the color stretchable film 565 is arranged) is different from the color of the low pressure region 550, the random measurement position includes a position in a part having a color different from that of the low pressure region 550 and a position in a part having the same color as that of the low pressure region 550.
The color difference Δ E is then calculated using the following expression based on the measurement result of the high pressure region 560 and the measurement result of the low pressure region 550.
ΔE*＝[(Δa*)2+(Δb*)2]1/2
Note that a typical definition of color difference also includes L values (brightness). However, in the case of diapers, the value of L tends to vary depending on the number of nonwoven sheets, thereby varying the color difference. For this reason, if the value of L is included in calculating the color difference, there is a risk that the color difference is different from the actually observed color difference. For this purpose, values of L are excluded when calculating the color difference Δ E.
The table in fig. 21 shows the results of the above experiment. The visibility of the high pressure area 560 is indicated by "∘" if all test subjects (a to E) can discriminate (∘) the high pressure area 560 and the low pressure area 550 for a certain color difference Δ E. Based on the results in the table, if the color difference Δ E is "1.45" or higher, the visibility of the high-pressure region 560 is "o".
In view of this, in the case where the front side band portion 521 and the rear side band portion 522 are viewed from at least one of the non-skin side and the skin side, when the difference in a value in a color system at L x a b between the high pressure region 560 and the low pressure region 550 is defined as Δ a, and the difference in b value in a color system at L x a b between the high pressure region 560 and the low pressure region 550 is defined as Δ b, the color difference Δ E is calculated using the following expression.
ΔE*＝[(Δa*)2+(Δb*)2]1/2
The color difference Δ E is advantageous if it is 1.45 or higher.
Therefore, the high pressure area 560 and the low pressure area 550 can be clearly distinguished, and the user can easily recognize the location of the high pressure area 560. Thus, the diaper 500 is easily properly fitted in place on the wearer. Note that the color difference Δ E was measured using the method described in the above experiment or an equivalent method.
As described above, when the front side belt portion 521 and the rear side belt portion 522 are viewed from at least one of the non-skin side and the skin side, it is sufficient that the color of the high pressure region 560 is different from the color of the low pressure region 550. However, it is more preferable that when the front side belt portion 521 and the rear side belt portion 522 are viewed from the non-skin side (outside), the color of at least a part of the high pressure region 560 is different from the color of at least a part of the low pressure region 560, that is, the color difference Δ E between the high pressure region 560 and the low pressure region 550 is 1.45 or higher.
According to this configuration, the user can easily recognize that the diaper 500 has the high pressure region 560, and easily recognize the high pressure region 560 when the user wears the diaper 500. In addition, because the location of the high pressure zone 560 can be identified from the non-skin side, the high pressure zone 560 is easily positioned in the area of the wearer to be restrained. Thus, the diaper 500 is easily properly fitted in place on the wearer.
In addition, it is preferable that the color of the stretchable member (i.e., the stretchable film 565 of the present embodiment) forming the high-pressure region 560 is different from the color of the low-pressure region 550. According to this configuration, the area identified by the user as the high pressure area 560 matches the area where the confining pressure is actually high. For this reason, the stretchable membrane 565 is easily positioned at the region to be restrained of the wearer, and the effect of the high pressure region 560 is easily obtained.
Note that the above configuration is not limited. At least one other member (the skin side sheets 5213 and 5223, the non-skin side sheets 5214 and 5224, the stretch nonwoven sheets 5215 and 5225) disposed in the high pressure region 560 may have a color different from that of the low pressure region 550. In this case, even if the stretchable film 565 is intermittently arranged in the up-down direction, for example, the entire region of the high pressure region 560 can be colored. In addition, even if the stretchable film 565 is disposed over the entire area of the high pressure region 560, a portion (e.g., a contour portion) of the high pressure region 560 may be colored.
Further, if the stretchable film 565 is colored, it is preferable that the stretchable film 565 be disposed toward the non-skin side with respect to the material layers laminated in the thickness direction of the front side band portion 521 and the rear side band portion 522. In the present embodiment, as shown in fig. 17, an extensible film 565 is disposed between the non-skin side sheets 5214 and 5224 and the extensible nonwoven fabric sheets 5215 and 5225.
According to this configuration, the visibility of the high-pressure region 560 from the non-skin side is high. Thus, the high pressure zones 560 may be more easily identified by the user, and the high pressure zones 560 are easily positioned in the wearer's area to be restrained. However, the above configuration is not limited, and the stretchable film 565 may be disposed closer to the skin side sheets 5213 and 5223 than the non-skin side sheets 5214 and 5224.
In addition, as with the stretchable film 565 of the present embodiment, the colored stretchable member forming the high pressure region 560 is preferably a sheet-like stretchable member. According to this configuration, the area of the different color portion having a color different from that of the low-pressure region 550 is larger than in the case where the stretchable member is an elastic thread. For this reason, the high pressure zone 560 is noticeable and easily recognizable by the user. In addition, the high pressure zone 560 is easily positioned in the area of the wearer to be restrained.
In addition, if the stretchable member forming the high pressure region 560 is a sheet-like stretchable member, the high pressure region 560 is in firm and close ground-surface contact with the wearer, and local constraint can be prevented. Therefore, the comfort of the diaper 500 can be improved, and the stretchable member is less likely to mark the wearer's skin.
Preferably, the high pressure region 560 is formed by a plurality of colored stretchable members (stretchable films 565) arranged in parallel at intervals in the vertical direction. According to this configuration, a stripe pattern is formed in the high pressure region 560, which is prominent as a decorative feature, and the high pressure region 560 is more easily recognized by a user. In addition, since the high pressure zone 560 is partially colored, the user is prevented from feeling the risk of over-restraining the diaper 500.
Fig. 22 is an explanatory diagram of the joint 530 formed in the stretchable film 565. As shown in the aforementioned fig. 18B, it is desirable that the colored stretchable film 565 is bonded to the sheet ( non-skin side sheets 5214 and 5224 in the present embodiment) disposed on the non-skin side thereof by a plurality of bonding portions 530 disposed intermittently.
According to this configuration, the non-skin side sheets 5214 and 5224 float from the stretchable film 565 between the junctions 530, and wrinkles (irregularities) are formed by the non-skin side sheets 5214 and 5224. For this reason, the stretchable film 565 may be identified while also preventing the stretchable film 565 from being too conspicuous. In other words, the hardness of the stretchable film 565 is reduced by the wrinkles. Thus, the user can be given a soft and comfortable impression of the diaper 500.
Further, as shown in fig. 22, it is preferable that the interval W2 between the coupling portions 530 adjacent in the up-down direction is smaller than the length (width) W1 of the stretchable membrane 565 in the up-down direction (W1 > W2), and the interval L0 between the coupling portions 530 adjacent in the left-right direction is smaller than the length of the stretchable membrane 565 in the left-right direction (the distance between the pairs of locking portions 524 in the present embodiment).
According to this configuration, the plurality of coupling portions 530 are arranged in the range in the vertical direction of the stretchable film 565, and the plurality of coupling portions 530 are arranged in the range in the horizontal direction of the stretchable film 565. For this reason, fine wrinkles are formed by the non-skin side sheets 5214 and 5224. Thus, the user can be given a soft and comfortable impression of the diaper 500.
However, the above configuration is not limited, and the entire area of the stretchable film 565 may be bonded to the non-skin side panels 5214 and 5224. In this case, the stretchable membrane 565 is conspicuous, and the visibility of the high pressure region 560 is high.
Note that, when comparing the length of the stretchable film 565 and the gap between the adjacent junctions 530, it is desirable that the front-side tape 521 and the rear-side tape 522 are elongated in such a manner as to eliminate wrinkles. Specifically, this is a state in which the front side belt portion 521 and the rear side belt portion 522 are extended so that the dimensions of their constituent members (for example, the non-skin side sheets 5214 and 5224 and the like) match or are close to the dimensions of the constituent members in the independent state. This similarly applies to the comparison of other lengths and positions described later.
In addition, in the case where the color of a portion of the high pressure region 560 is different from the color of the low pressure region 550, the high pressure region 560 includes a different color portion 566 (a portion including the stretchable film 565) having a color different from the color of the low pressure region 550 and a non-different color portion 567 which is a region other than the different color portion 566. In this case, at least in the front side band portion 521 or the rear side band portion 522, the higher the proportion of the different color portion 566 per unit area in the center portion in the left-right direction is, the better, than in the end portions.
For example, as shown in fig. 19, in the left-right direction central portion of the front side belt portion 521, a part of the first high pressure region 561 and a part of the second high pressure region 562 overlap each other, and in the left-right direction end portion, the first high pressure region 561 and the second high pressure region 562 are separated from each other. Therefore, the ratio of the different color portions 566 per unit area is high in the center portion in the left-right direction. This similarly applies to the rear-side band portion 522.
The left-right direction central portions of the front side band portion 521 and the rear side band portion 522 are more noticeable to the user than the end portions, and the high pressure region 560 is more easily recognized by the user because the ratio of the different color portions 566 per unit area in the central portion is increased. However, the configuration is not limited, and for example, the proportion of the different color portion 566 per unit area may be constant, or may be higher in both end portions in the left-right direction than in the center portion.
Further, as shown in fig. 19 and 20, it is desirable that the vertical length L51 from the waistline opening 500a to the upper end 560a of the portion of the high pressure region 560 located at the center portion in the left-right direction of the front side belt portion 521 is different from the vertical length L52 from the waistline opening 500a to the upper end 560a of the portion of the high pressure region 560 located at the center portion in the left-right direction of the rear side belt portion 522.
According to this configuration, the user can discriminate the front and rear of the diaper 500 based on the position of the recognizable high pressure region 560 in the up-down direction. Therefore, the diaper 500 is easily put on correctly with respect to the front-rear direction.
Note that it is sufficient that the ratio of the distinctive segment 566 per unit area and the lengths (L51, L52) from the high pressure region 560 to the waistline opening 500a are satisfied at least in the pair of latching portions 524 (both end portions in the left-right direction of the belt portion) and the center between the pair of latching portions 524 (the center portion in the left-right direction of the belt portion). It is preferable that these conditions be satisfied in both end portions of the length 1/3 extending from the pair of locking portions 524 for the distance between the pair of locking portions 524 and in the central portion therebetween.
In addition, it is desirable that the contraction magnification of the high-pressure region 560 is higher than that of the low-pressure region 550. The shrinkage factor is a value calculated by the expression "(a-b)/a × 100 (%)" where a is the left-right direction length of the high pressure region 560 and the low pressure region 550 in a state elongated in the left-right direction in a manner to eliminate wrinkles, and b is the left-right direction length of the high pressure region 560 and the low pressure region 550 in a natural state. Thus, if the high pressure zone 560 is colored, the color of the high pressure zone 560 is relatively darker when the diaper 500 is in a natural state. For this reason, the high pressure region 560 is easily recognized by the user.
In addition, it is desirable to set the light transmittance of the sheet other than the colored sheet (here, the stretchable film 565) in the high-pressure region 560 to be high (for example, 50% or more). In addition, it is desirable to set the amount of the white pigment (e.g., titanium oxide or the like) contained in the sheet other than the colored sheet to be low (e.g., less than 10%). Therefore, the colored sheet is more easily seen through the other sheet from the non-skin side and the skin side of the front side belt portion 521 and the back side belt portion 522, and the high pressure region 560 is more easily recognized by the user.
Next, the shapes of the first to fourth high pressure regions 561 to 564 will be described in detail.
As shown in fig. 19, the first high pressure region 561 of the front side band portion 521 extends continuously in the left-right direction between the pair of locking portions 524, and the left-right direction central portion of the first high pressure region 561 is located below both end portions thereof. More specifically, the first high pressure regions 561 are gradually inclined downward from both end portions in the left-right direction toward the center portion.
For this reason, the abdominal region of the wearer can be prevented from being excessively restrained by the first high pressure region 561. In addition, the low pressure region 550 can be suitably brought into close contact with the abdominal region of the wearer, whereby the comfort of the diaper 500 can be improved. In addition, the left and right direction both end portions of the first high pressure region 561 may restrain a region near the front superior iliac spine of the wearer and may suppress displacement of the diaper 500 during use.
The second high pressure region 562 of the front side band part 521 also extends continuously in the left-right direction between the pair of locking parts 524, both left-right direction end parts of the second high pressure region 562 are located at positions lower than the first high pressure region 561, and at least a part of the left-right direction central part of the second high pressure region 562 overlaps the first high pressure region 561.
In other words, the left-right direction center portion of the second high pressure region 562 is located at a relatively low position, similar to the first high pressure region 561. For this reason, the abdominal region of the wearer can be prevented from being excessively restrained by the second high pressure region 562. In addition, the left and right direction both end portions of the second high pressure region 562 can restrain the region near the wearer's anterior superior iliac spine, thereby supporting the region from below, and can suppress displacement of the diaper 500 during use.
Further, as shown in fig. 20, the third high pressure region 563 of the rear belt portion 522 extends continuously in the left-right direction between the pair of locking portions 524, and the left-right direction central portion of the third high pressure region 563 is located higher than both left-right direction end portions thereof. More specifically, the third high pressure regions 563 are gradually inclined upward from both end portions in the left-right direction toward the central portion.
For this reason, the central portion of the hip region where the wearer's motion range is large can be prevented from being excessively restrained by the third high pressure region 563. In addition, the low-pressure region 550 can be suitably brought into close contact with the central portion of the hip region of the wearer, whereby the comfort of the diaper 500 can be improved. In addition, if the high pressure region 560 is located at the central portion of the hip region, there is a risk that the high pressure region 560 will be displaced by the bulge and movement of the central portion of the hip region, thereby causing displacement of the diaper 500. In contrast, the third high pressure region 563 is arranged in such a manner as to partially surround the central portion of the hip region from the upper side, thereby suppressing the displacement. In addition, similar to the second high pressure region 562, the left and right direction both end portions of the third high pressure region 563 may restrain a region near the wearer's anterior superior iliac spine, thereby supporting the region from below, and may suppress displacement of the diaper 500 during use.
In addition, the fourth high pressure region 564 of the back side belt portion 522 also extends continuously in the left-right direction between the pair of locking portions 524, both left-right direction end portions of the fourth high pressure region 564 are located higher than the third high pressure region 563, and at least a portion of a left-right direction central portion of the fourth high pressure region 564 overlaps with the third high pressure region 563.
In other words, the left-right direction center portion of the fourth high pressure region 564 is located at a relatively high position, similar to the third high pressure region 563. For this reason, the central portion of the hip region of the wearer can be prevented from being excessively restrained by the fourth high pressure region 564. In addition, the left and right direction both end portions of the fourth high pressure region 564 may restrain the region near the wearer's anterior superior iliac spine similarly to the first high pressure region 561 due to being located at relatively high positions, and may suppress displacement of the diaper 500 during use.
Note that it is sufficient that the positional relationship of the first high pressure region 561 to the fourth high pressure region 564 is satisfied at least in the pair of the locking portions 524 (both left and right direction end portions of the high pressure region) and the center between the pair of the locking portions 524 (the left and right direction center portion of the high pressure region). It is preferable that these conditions be satisfied in both end portions of the length 1/3 extending from the pair of locking portions 524 for the distance between the pair of locking portions 524 and in the central portion therebetween.
In addition, it is desirable that the positions of the first and fourth high pressure regions 561, 564 in the up-down direction are partially or completely aligned with each other in the locking portion 524. Similarly, it is desirable that the positions of the second and third high pressure regions 562 and 563 in the up-down direction partially or completely align with each other in the lock portion 524. According to this configuration, an annular high pressure region 560 is formed. Thus, the diaper 500 fits around the waist of the wearer, and displacement of the diaper 500 can be suppressed.
In addition, in the center in the left-right direction of the front side belt portion 521 and the rear side belt portion 522, the lower end of the fourth high pressure region 564 is disposed higher than the lower end of the first high pressure region 561, and the lower end of the third high pressure region 563 is disposed higher than the lower end of the second high pressure region 562. Thus, the abdominal region can be pressed obliquely upward, and the intra-abdominal pressure can be raised. This can therefore assist in the movement of pelvic region muscles (e.g., abdominal muscles) and can stabilize the pelvis of the wearer.
In the rear belt portion 522, the vertical length from the upper end of the fourth high pressure region 564 to the lower end of the third high pressure region 563 is longer in both the left and right direction end portions than in the left and right direction central portion, and the position of the lower end of the third high pressure region 563 is lower in both the left and right direction end portions than in the left and right direction central portion. Further, the lower end of the third high pressure region 563 is gradually inclined downward from the central portion of the rear belt portion 522 in the left-right direction toward both end portions. In other words, the third high pressure region 563 and the fourth high pressure region 564 are configured to conform to the shape of the gluteus medius. For this reason, the third high pressure region 563 and the fourth high pressure region 564 may restrain the gluteus medius of the wearer and may assist the movement of the gluteus medius when the diaper 500 is worn. As a result, the pelvis of the wearer is stabilized during movement such as walking, and the movement (walking) of the wearer can be supported.
In addition, in the diaper 500 of the present embodiment, the high-pressure region 560 fitted to the body shape of the wearer as described above is visible because of the color different from that of the low-pressure region 550. To this end, the user may wear the diaper 500 in a position of the wearer that allows movement, is comfortable, and is not easily displaced. Therefore, the effect of the high pressure region 560 is more surely obtained.
Note that the high pressure regions 560 shown in fig. 19 and 20 are merely examples, and the number, shape, configuration, and the like of the high pressure regions 560 are not particularly limited. For example, the diaper 500 may have any one of the one or more first high pressure regions 561 through fourth high pressure regions 564. In addition, the following configuration is possible: one of the front side band portion 521 or the back side band portion 522 has a high pressure region 560 and the other does not have a high pressure region 560.
Although the embodiments of the present disclosure have been described above, the above embodiments of the present disclosure are only for facilitating understanding of the present disclosure and are not to be construed as limiting the present disclosure in any way. The present disclosure may be subject to various changes or modifications without departing from the gist thereof, and covers equivalents thereof.
Description of the reference numerals
1 underpants type disposable diaper,
10 an absorbent body, 11 an absorbent core,
12 front sheet, 13 back sheet, 14 three-dimensional gather portion,
20 an outer package,
21 ventral outer body (front side belt part), 21s base region,
22 a back-side outer body (back-side belt part),
213. 223 skin side sheet (skin side nonwoven sheet),
214. 224 a non-skin side sheet (non-skin side nonwoven sheet),
215. 225 stretchable nonwoven fabric sheet (stretchable member),
23 crotch outer cover, 24 end joining region,
26 waist elastic members, 26s stretchable regions,
27 leg elastic members,
30 stretchable film, 30s high pressure region,
31s the first high pressure region, 32s the second high pressure region,
33s low pressure region, 34 vent part,
40 welding part, 50 holes (ventilation part),
300 diapers (pants-type disposable diapers),
310 an absorbent body, 311 an absorbent core,
312 front surface sheet, 313 back surface sheet,
320 outer package, 321 front side band part, 322 rear side band part,
3213. 3223 side skin sheet, 3214, 3224 non-side skin sheet,
3215. 3225 an extensible nonwoven fabric sheet (front extensible member),
323 a crotch part, 324 a locking part,
326 waist elastic threads, 327 leg elastic threads,
330 low pressure region, 331 rear side low pressure region (low pressure region),
332 front side low pressure area,
340 high-pressure region, 341 rear high-pressure region (high-pressure region),
342 front side high pressure area,
343 an elastic film (rear side elastic member, front side elastic member),
350 joint, 360 gluteus medius, 361 gluteus maximus,
500 diapers (pants-type disposable diapers),
500a waist opening, 500b leg opening,
510 an absorbent body, 511 an absorbent core,
512 front surface piece, 513 back surface piece,
520 an outer package,
521 a front side belt part (belt part), 522 a rear side belt part (belt part),
5213. 5223 skin side sheet, 5214 skin non-skin side sheet, 5224 skin non-skin side sheet,
5215. 5225 stretchable nonwoven sheet,
523 crotch part, 524 locking part, 527 leg elastic thread,
530 a joint portion,
540 waist stretch region (stretch region), 541 elastic thread,
550 low-pressure area,
560 high pressure area,
561 a first high pressure area, 562 a second high pressure area,
563 a third high pressure region, 564 a fourth high pressure region,
565a stretchable film (stretchable member),
566 different color part, 567 non-different color part

Claims (39)

1. A pants-type disposable diaper having a vertical direction, a horizontal direction and a front-rear direction intersecting each other,
the pants-type disposable diaper includes:
a front side band portion;
a rear side belt portion; and
an absorbent body comprising an absorbent core,
the front side belt part and the back side belt part form a waist opening at an upper end of the pants-type disposable diaper,
the front belt part and the rear belt part each include a skin-side nonwoven fabric sheet, a non-skin-side nonwoven fabric sheet, and a stretchable member,
the skin-side nonwoven fabric sheet is located at the position closest to the skin side,
the non-skin side nonwoven fabric sheet is located at the position closest to the non-skin side,
the stretchable member is stretchable in the left-right direction,
the front side band portion and the rear side band portion each having a stretch region, a base region and a high pressure region,
the stretch region is a region extending along an edge of the waist opening,
the base region is a region adjacent to a lower side of the stretchable region at a center of the front side belt portion in a left-right direction,
the high pressure region is disposed below the telescopic region,
a magnitude of a force required to elongate the unit width portion of the high pressure region by a unit length in the left-right direction is larger than a magnitude of a force required to elongate the unit width portion of the base region by a unit length in the left-right direction,
the high pressure region extending circumferentially around the front and back band portions,
the high pressure region includes an elastic film between the skin-side nonwoven fabric sheet and the non-skin-side nonwoven fabric sheet,
the high pressure region includes a vent portion in which air permeability is higher than in a portion where the stretchable membrane is located,
the high pressure region does not overlap the absorbent core in the front-rear direction in at least one of the front side belt portion and the rear side belt portion.
2. A pants-type disposable diaper according to claim 1,
the stretchable member is a sheet-like member having air permeability.
3. A pants-type disposable diaper according to claim 2,
the stretchable member is a stretchable nonwoven fabric sheet,
the stretchable nonwoven fabric sheet is disposed at a position between the skin-side nonwoven fabric sheet and the non-skin-side nonwoven fabric sheet, and
the stretchable nonwoven fabric sheet is positioned on the skin side with respect to the stretchable film.
4. A pants-type disposable diaper according to claim 2 or 3,
the stretchable member is a stretchable nonwoven fabric sheet,
in the stretchable region, a plurality of thread-like elastic members are arranged side by side at intervals in the vertical direction, and the plurality of thread-like elastic members are stretchable and stretchable in the horizontal direction
A length in the up-down direction from an upper end of the high pressure region to the upper end of the front side belt portion is greater than a length in the up-down direction of the high pressure region at a center in the left-right direction of the front side belt portion.
5. A pants-type disposable diaper according to any one of claims 1 to 4,
in the high pressure region, the plurality of stretchable films that are long in the left-right direction are arranged side by side at intervals in the up-down direction, and
a portion between the stretchable membranes adjacent in the up-down direction serves as the vent portion.
6. A pants-type disposable diaper according to claim 5,
in the high-pressure region, an area of a portion where the stretchable membrane is located is larger than an area of the vent portion between the stretchable membranes adjacent in the up-down direction.
7. A pants-type disposable diaper according to claim 5 or 6,
a value obtained by dividing an area of the ventilation portion by an area of the high pressure region is larger in side portions of the front side belt portion and the rear side belt portion in the left-right direction than in a center portion of the front side belt portion and the rear side belt portion in the left-right direction.
8. A pants-type disposable diaper according to any one of claims 5 to 7, wherein each of the stretchable films does not have a hole penetrating the stretchable film.
9. A pants-type disposable diaper according to any one of claims 1 to 7,
the stretchable membrane has a hole penetrating through the stretchable membrane, and
the hole forms the vent.
10. A pants-type disposable diaper according to any one of claims 1 to 9,
the skin-side nonwoven fabric sheet, the non-skin-side nonwoven fabric sheet, the stretchable member, and the stretchable film are welded together in the front-back direction using the same welding pattern.
11. A pants-type disposable diaper according to claim 10,
the welding pattern is a pattern in which a plurality of welding parts are scattered, and
in an extended state of the pants-type disposable diaper, an area of the vent portion is larger than an area of the welded portion located in the high pressure region.
12. A pants-type disposable diaper having a vertical direction, a horizontal direction and a front-rear direction intersecting each other,
the pants-type disposable diaper includes:
a front side band portion;
a rear side belt portion; and
a pair of locking portions in which both side portions in the left-right direction of the front side band portion are locked to both side portions in the left-right direction of the rear side band portion,
the rear side band portion has a low pressure region and a high pressure region,
the low pressure region and the high pressure region have stretchability in the left-right direction,
a magnitude of a force required to elongate a unit length in the left-right direction per unit width portion of the high pressure region in the up-down direction is larger than a magnitude of a force required to elongate a unit length in the left-right direction per unit width portion of the low pressure region in the up-down direction,
the high pressure area continuously extends in the right-left direction between the pair of locking portions,
a length of the high pressure region in the up-down direction is longer in both end portions of the high pressure region in the left-right direction than in a center portion of the high pressure region in the left-right direction,
a lower end of the high pressure region is located lower in both end portions in the left-right direction than in a central portion in the left-right direction of the high pressure region,
in a central portion of the rear side belt portion in the left-right direction, the low pressure region is disposed adjacent to a lower side of the high pressure region.
13. A pants-type disposable diaper according to claim 12,
the lower end of the high pressure region is inclined downward from the center portion of the high pressure region in the left-right direction toward both end portions.
14. A pants-type disposable diaper according to claim 12 or 13,
the pants-type disposable diaper further comprises an absorbent core,
the high pressure region is configured not to overlap with a rear side portion of the absorbent core in the front-rear direction, and
the low pressure region is disposed at least between a lower end of the high pressure region and an upper end of the rear side portion of the absorbent core.
15. A pants-type disposable diaper according to any one of claims 12 to 14,
the front belt portion has a front stretchable member stretchable in the right-left direction,
the front side stretchable member continuously extends in the right-left direction between the pair of locking portions, and
the high pressure region is connected to the front telescoping member in the locking section.
16. A pants-type disposable diaper according to claim 15,
the front side belt portion includes:
a front side low pressure region having stretchability in the left-right direction; and
a front side high pressure region including the front side stretchable member,
a magnitude of a force required to elongate a unit length in the left-right direction per unit width portion in the up-down direction of the front side high pressure region is larger than a magnitude of a force required to elongate a unit length in the left-right direction per unit width portion in the up-down direction of the front side low pressure region, and
the high pressure region is connected to the front side high pressure region in the locking portion.
17. A pants-type disposable diaper according to claim 16,
the front side high pressure region includes a plurality of front side stretchable members arranged side by side at an interval in the up-down direction,
the high pressure region includes a plurality of rear stretchable members arranged side by side at intervals in the vertical direction, the rear stretchable members being stretchable in the horizontal direction and being stretchable
In the locking portion, it is preferable that,
the front side stretchable member at the highest position and the rear side stretchable member at the highest position are connected to each other, and
the front side stretchable member at the lowest position and the rear side stretchable member at the lowest position are connected to each other.
18. A pants-type disposable diaper according to claim 16 or 17,
a length of the front side high pressure region in the up-down direction is longer in both end portions of the front side high pressure region in the left-right direction than in a central portion of the front side high pressure region in the left-right direction, and
an upper end of the front side high pressure region is located at a higher position in both end portions of the front side high pressure region in the left-right direction than in a center portion of the front side high pressure region in the left-right direction.
19. A pants-type disposable diaper according to claim 18,
the front low pressure region is disposed adjacent to an upper side of the front high pressure region in a central portion of the front belt portion in the left-right direction.
20. The pants-type disposable diaper according to any one of claims 16 to 19,
the pants-type disposable diaper further comprises an absorbent core,
the front side high pressure region is configured not to overlap with a front side portion of the absorbent core in the front-rear direction.
21. A pants-type disposable diaper according to any one of claims 12 to 20,
the high pressure region includes a plurality of rear stretchable members arranged side by side at intervals in the vertical direction, the rear stretchable members being stretchable in the horizontal direction and being stretchable
The interval between the rear stretchable members adjacent in the up-down direction is wider in both end portions of the high-pressure region in the left-right direction than in a central portion of the high-pressure region in the left-right direction.
22. A pants-type disposable diaper according to any one of claims 12 to 21,
the high pressure region includes a rear side stretchable member stretchable in the left-right direction, and
the rear side stretchable member is a sheet-like member.
23. A pants-type disposable diaper according to claim 22,
in the high-pressure region, a stretchable nonwoven fabric sheet and a stretchable film are disposed between a skin side sheet and a non-skin side sheet,
in the low-pressure region, the stretchable nonwoven fabric sheet is disposed between the skin side sheet and the non-skin side sheet.
24. A pants-type disposable diaper according to any one of claims 12 to 23,
the telescoping member is configured to extend along a pair of leg openings.
25. A pants-type disposable diaper having a vertical direction, a horizontal direction and a front-rear direction intersecting each other,
the pants-type disposable diaper includes:
a belt portion; and
an absorbent main body having a plurality of absorbent layers,
the belt portion has a low pressure region and a high pressure region,
the low pressure region and the high pressure region are located below the stretch region extending along the edge of the waistline opening,
the low pressure region and the high pressure region are adjacent to each other,
the low pressure region and the high pressure region have stretchability in the left-right direction,
a magnitude of a force required to elongate a unit length in the left-right direction per unit width portion of the high pressure region in the up-down direction is larger than a magnitude of a force required to elongate a unit length in the left-right direction per unit width portion of the low pressure region in the up-down direction,
the color of at least a portion of the high pressure region is different from the color of the low pressure region when the belt portion is viewed from at least one of a non-skin side and a skin side.
26. A pants-type disposable diaper according to claim 25,
the color of the contour portion of the high pressure region in the up-down direction is different from the color of the low pressure region when the belt portion is viewed from at least one of the non-skin side and the skin side.
27. A pants-type disposable diaper according to claim 25 or 26,
when the belt portion is viewed from at least one of the non-skin side and the skin side,
let Δ a be the difference in a values in a color system between said high pressure region and said low pressure region, and
let Δ b be the difference in b values in the L a b color system between the high pressure region and the low pressure region,
a color difference Δ E between the high pressure region and the low pressure region calculated using the following expression is 1.45 or higher:
ΔE*＝[(Δa*)2+(Δb*)2]1/2。
28. a pants-type disposable diaper according to claim 27,
the color difference Δ Ε is 1.45 or more when the webbing portion is viewed from the non-skin side.
29. A pants-type disposable diaper according to any one of claims 25 to 28,
the high pressure region includes a stretchable member stretchable in the left-right direction, and
the color of the stretchable member is different from the color of the low pressure region.
30. A pants-type disposable diaper according to claim 29,
in the high pressure region, a plurality of members overlap each other in a thickness direction of the belt portion, and
the stretchable member is disposed on the non-skin side.
31. A pants-type disposable diaper according to claim 29 or 30,
the stretchable member is a sheet-like stretchable member.
32. A pants-type disposable diaper according to any one of claims 29 to 31,
the high pressure region includes a plurality of the stretchable members arranged in parallel at an interval in the vertical direction.
33. A pants-type disposable diaper according to any one of claims 29 to 32,
the stretchable member is intermittently bonded to the sheet disposed on the non-skin side with respect to the stretchable member by a plurality of bonding portions,
the interval between the joining portions adjacent in the up-down direction is smaller than the length of the stretchable member in the up-down direction, and
an interval between the coupling portions adjacent in the left-right direction is smaller than a length of the stretchable member in the left-right direction.
34. A pants-type disposable diaper according to any one of claims 25 to 33,
the high pressure region includes:
a different color portion having a color different from that of the low pressure region; and
a non-different color portion as a portion other than the different color portion, and
the ratio of the different color portion per unit area is higher in a central portion of the belt portion in the left-right direction than in end portions of the belt portion in the left-right direction.
35. A pants-type disposable diaper according to any one of claims 25 to 34,
the belt portions include a front side belt portion and a rear side belt portion, and
a length in the up-down direction from the waistline opening to an upper end of the high pressure region in the center portion in the left-right direction of the front side belt portion is different from a length in the up-down direction from the waistline opening to an upper end of the high pressure region in the center portion in the left-right direction of the rear side belt portion.
36. A pants-type disposable diaper according to any one of claims 25 to 35,
the band portion includes a front band portion and a rear band portion,
both side portions in the left-right direction of the front side belt portion are locked to both side portions in the left-right direction of the rear side belt portion in a pair of locking portions,
the high pressure region has a first high pressure region in the front side belt portion,
the first high pressure area extends continuously in the right and left direction between the pair of locking portions, and
a central portion in the left-right direction of the first high pressure region is located below both end portions in the left-right direction of the first high pressure region.
37. A pants-type disposable diaper according to claim 36,
the high pressure region has a second high pressure region in the front side belt portion,
the second high pressure area extends continuously in the right-left direction between the pair of locking portions,
both end portions of the second high pressure region in the left-right direction are located below the first high pressure region, and
at least a part of the center portion in the left-right direction of the second high pressure region overlaps with the first high pressure region.
38. A pants-type disposable diaper according to any one of claims 25 to 37,
the band portion includes a front band portion and a rear band portion,
both side portions in the left-right direction of the front side belt portion are locked to both side portions in the left-right direction of the rear side belt portion in a pair of locking portions,
the high pressure region has a third high pressure region in the rear side belt portion,
the third high pressure area extends continuously in the right and left direction between the pair of locking portions, and
a central portion in the left-right direction of the third high pressure region is located above both end portions in the left-right direction of the third high pressure region.
39. A pants-type disposable diaper according to claim 38,
the high pressure region has a fourth high pressure region in the rear side belt portion,
the fourth high pressure area extends continuously in the right-left direction between the pair of locking portions,
both end portions of the fourth high pressure region in the left-right direction are located above the third high pressure region, and
at least a portion of the center portion in the left-right direction of the fourth high pressure region overlaps with the third high pressure region.
CN201980023128.0A 2018-04-03 2019-04-01 Pants-type disposable diaper Active CN111936097B (en)

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CN202210021553.XA CN114376799B (en) 2018-04-03 2019-04-01 Underpants type disposable diaper
CN202210020757.1A CN114376798B (en) 2018-04-03 2019-04-01 Pants-type disposable diaper

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JP2018-071289 2018-04-03
JP2018071289A JP6503489B1 (en) 2018-04-03 2018-04-03 Pants type disposable diaper
JP2018124400A JP7171266B2 (en) 2018-06-29 2018-06-29 Pants-type disposable diaper
JP2018-124400 2018-06-29
JP2018-247119 2018-12-28
JP2018247119A JP2020103719A (en) 2018-12-28 2018-12-28 Underpants type disposable diaper
JP2019-008507 2019-01-22
JP2019008507A JP7195945B2 (en) 2019-01-22 2019-01-22 Pants-type disposable diaper
PCT/JP2019/014440 WO2019194118A1 (en) 2018-04-03 2019-04-01 Pull-on disposable diaper

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