CN117425462A - Pants-type absorbent article - Google Patents
Pants-type absorbent article Download PDFInfo
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- CN117425462A CN117425462A CN202280039948.0A CN202280039948A CN117425462A CN 117425462 A CN117425462 A CN 117425462A CN 202280039948 A CN202280039948 A CN 202280039948A CN 117425462 A CN117425462 A CN 117425462A
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- region
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- skin
- reducing agent
- waist
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- 239000002250 absorbent Substances 0.000 title claims abstract description 93
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 176
- 238000007789 sealing Methods 0.000 claims abstract description 107
- 238000003466 welding Methods 0.000 claims abstract description 89
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- 210000001015 abdomen Anatomy 0.000 claims description 12
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Landscapes
- Absorbent Articles And Supports Therefor (AREA)
Abstract
The pants-type absorbent article according to one embodiment of the present invention includes an outer body having a ventral region, a dorsal region, and a pair of side joints. At least one of the side engagement portions has: a plurality of sealing parts which extend in the transverse direction respectively and are arranged at intervals in the longitudinal direction; and a weld strength reducing agent extending linearly. The plurality of sealing parts include a first cross sealing part and a second cross sealing part, which are sealing parts arranged in the waist region and cross the welding strength reducing agent except the inner end part and the outer end part in a plan view. At the side joint portion including the first and second cross seals, the crossing angles α1, α2, α3, and α4 of the welding strength reducing agent with the respective cross seals satisfy the following formula (1): 5 degrees < alpha 1 < alpha 2< alpha 3 < alpha 4<90 degrees … (1).
Description
Technical Field
The present invention relates to a pants-type absorbent article such as a disposable diaper.
Background
The pants-type absorbent article generally has an absorbent main body, an outer body, a side joint (side sealing portion) formed by joining a front outer body and a back outer body at side ends. The abdomen-side outer body and the back-side outer body are joined by the side joining portion, thereby forming a waist portion of the pants-type absorbent article.
On the other hand, after wearing the pants-type absorbent article, the side joint portions may be torn apart and discarded from a hygienic point of view. Therefore, the side joint portion is required to have a function of being able to be easily torn off when worn (when wearing a pants-type absorbent article) and when being worn without being peeled off.
From such a point of view, patent document 1 discloses a pants-type absorbent article having, at a joint portion between both side ends of a front side portion and a back side portion of an outer body: a strength-reducing region portion in which a bonding strength-reducing material for reducing bonding strength is disposed; and a non-strength-reducing region portion where the bonding strength-reducing material is not disposed. In this document, the joint portions are arranged continuously in the longitudinal direction, and the strength-reducing region portions are arranged, for example, on the inner side and/or the outer side in the width direction of the joint portions.
Patent document 2 discloses a pants-type wearing article in which a joining strength reducing agent is disposed between sheets of side joining portions, and the joining strength reducing agent is disposed more at the outer side portion than at the inner side portion in the width direction of the side joining portions.
Prior art literature
Patent literature
Patent document 1: japanese patent laid-open publication No. 2011-72577
Patent document 2: japanese patent laid-open No. 2018-88945
Disclosure of Invention
A pants-type absorbent article according to an embodiment of the present invention includes: an absorbent body; and an outer body comprising a plurality of thermoplastic sheets and disposed on the non-skin-facing side of the absorbent main body, and having a longitudinal direction extending from the abdomen side to the back side of the wearer through the crotch portion and a transverse direction orthogonal to the longitudinal direction.
The outer package includes:
a ventral region disposed on the ventral side of the wearer;
a back side region disposed on the back side of the wearer; and
a pair of side joint parts formed by respectively jointing the lateral edge part of the abdomen side area and the lateral edge part of the back side area.
The pair of side joint portions have waist end portions and leg end portions constituting both end portions in the longitudinal direction, respectively.
At least one of the side joint parts has: a plurality of sealing parts extending in the lateral direction and arranged at intervals in the longitudinal direction; and a linearly extending weld strength reducing agent disposed between the thermoplastic sheets.
The plurality of sealed portions include an inner end portion which is the end portion on the inner side in the lateral direction and an outer end portion which is the end portion on the outer side in the lateral direction, and include a first cross sealed portion and a second cross sealed portion which are sealed portions arranged in a waist region located within 25mm from the waist end portion in the longitudinal direction and cross the weld strength reducing agent other than the inner end portion and the outer end portion in a plan view.
The first cross seal and the second cross seal are disposed adjacent to each other in this order from the waist end side toward the leg end side.
When an intersection angle between the welding strength reducing agent and the first cross-seal portion on the waist end side and the lateral inner side is α1, an intersection angle between the welding strength reducing agent and the first cross-seal portion on the leg end side and the lateral outer side is α2, an intersection angle between the welding strength reducing agent and the second cross-seal portion on the waist end side and the lateral inner side is α3, and an intersection angle between the welding strength reducing agent and the second cross-seal portion on the leg end side and the lateral outer side is α4, the side joint portion including the first cross-seal portion and the second cross-seal portion satisfies the following formula (1):
5 degrees < alpha 1 < alpha 2< alpha 3 < alpha 4<90 degrees … (1).
Drawings
Fig. 1 is a schematic perspective view showing a pants-type absorbent article according to a first embodiment of the present invention.
Fig. 2 is a schematic plan view showing the skin-facing surface side of the pants-type absorbent article, and is a view showing a configuration in which the pants-type absorbent article is developed and the elastic members of the respective portions are stretched and expanded into a planar shape.
Fig. 3 is a schematic plan view showing a side joint of the pants-type absorbent article.
Fig. 4 is a schematic cross-sectional view of the side joint, and shows a state in which the ventral region and the dorsal region are separated.
Fig. 5 is a schematic plan view showing a side joint portion according to a modification of the above embodiment.
Fig. 6 (a) and (B) are schematic plan views each showing a side joint portion according to a modification of the above embodiment.
Fig. 7 is a schematic plan view for explaining the arrangement of the embossed portions of the skin-side sheet at the side joining portions.
Fig. 8 is a schematic cross-sectional view showing a side joint portion of a pants-type absorbent article according to a second embodiment of the present invention, and is a view showing a state in which a abdomen-side region and a back-side region are separated.
Fig. 9 is a schematic cross-sectional view showing a side joint portion of a pants-type absorbent article according to a third embodiment of the present invention, and is a view showing a state in which a abdomen-side region and a back-side region are separated.
Fig. 10 is a schematic cross-sectional view showing a side joint portion of a pants-type absorbent article according to a fourth embodiment of the present invention, and is a view showing a state in which a abdomen-side region and a back-side region are separated.
Detailed Description
The techniques described in patent documents 1 and 2 are each a technique for adjusting the joining strength of the side joining portion by a joining strength reducing agent, and there is room for improvement from the viewpoints of prevention of separation during the wearing operation and wearing and easiness of tearing at the time of disposal.
The present invention relates to a pants-type absorbent article capable of preventing separation during wearing and preventing tearing during disposal.
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
< first embodiment >
[ integral Structure of pants-type Disposable diaper ]
Fig. 1 and 2 show a pants-type disposable diaper 1 as a pants-type absorbent article according to a first embodiment of the present invention. The pants-type disposable diaper 1 is hereinafter referred to as diaper 1.
As shown in fig. 1, the diaper 1 has a waist opening 1W and a pair of leg openings IL, and is put on the waist and crotch of a wearer when worn. The waist opening 1W has a waist opening end Wa. The diaper 1 has a longitudinal direction X and a transverse direction Y. The longitudinal direction X extends from the abdomen side to the back side of the wearer through the crotch portion. The lateral direction Y is orthogonal to the longitudinal direction X and corresponds to the left-right direction of the wearer. As shown in fig. 2, a direction orthogonal to the longitudinal direction X and the transverse direction Y of the diaper 1 is referred to as a thickness direction Z.
In the present specification, "waist side" means a side closer to the waist opening end Wa of the waist opening 1W in the longitudinal direction X, and "leg side" means a side farther from the waist opening end Wa in the longitudinal direction X.
In the present specification, "inside in the lateral direction Y" means a side closer to the longitudinal center line CL dividing the pants-type absorbent article (diaper 1) 2 in the lateral direction Y by equal parts, and "outside in the lateral direction Y" means a side farther from the longitudinal center line CL.
In the present specification, the side closer to the skin of the wearer when the pants-type absorbent article (diaper 1) is worn is sometimes referred to as the skin side, and the side closer to the clothing is sometimes referred to as the non-skin side. The "skin-facing surface" refers to a surface of the pants-type absorbent article (diaper 1) or its constituent members facing the skin of the wearer, that is, a surface relatively close to the skin of the wearer. The "non-skin-facing surface" refers to a surface of the pants-type absorbent article (diaper 1) or its constituent members facing the opposite side (clothing side) from the skin-facing surface, that is, a surface relatively distant from the skin of the wearer.
When wearing the diaper 1, the wearer first pulls up the diaper 1 toward the torso by passing the legs through the pair of leg openings 1L, and places the diaper 1 in the waist and crotch of the wearer. In this specification, this series of actions is referred to as "wearing action". The wearing action may also be performed by a caregiver instead of the wearer of the diaper 1. Therefore, in the present specification, the main body of the wearing operation is referred to as "caregiver or the like".
In the present specification, a state in which the diaper 1 is disposed at an appropriate wearing position generally envisaged by the wearer is referred to as "wearing time".
As shown in fig. 1 and 2, the diaper 1 includes an absorbent main body 4 and an outer body 5 disposed on a non-skin-facing side of the absorbent main body 4.
Fig. 2 shows a configuration in which the diaper 1 is developed and the elastic members of the respective sections are extended to be flat so as to be a design size in a state in which all influences of the elastic members are eliminated. This mode is also referred to as "developed and extended form" of the diaper 1. The unfolding of the diaper 1 means that the abdomen-side region 5a and the back-side region 5b of the side joint 8 described later are separated.
The absorbent body 4 is fixed to the skin-facing surface side of the outer body 5. The absorbent body 4 may include at least the absorber 40, the front sheet 2, the back sheet (not shown), and the like. For example, the absorbent body 4 has a structure in which a back sheet, an absorber 40, and a front sheet 2 are laminated in the thickness direction Z. The absorber 40 includes a liquid-retentive absorbent core, and may further include a core sheet covering the absorbent core.
As the material used for each of the components (back sheet, absorber 40, front sheet 2, etc.) included in the absorbent main body 4, materials used in this technical field can be used without particular limitation.
The outer package 5 comprises a plurality of thermoplastic sheets 50. Zxfoom 5 e.g. 5. 5 for example individual thermoplastic sheets 50.
The thermoplastic sheet 50 is a sheet mainly composed of a thermoplastic resin. The thermoplastic sheet 50 preferably contains 90 mass% or more of a thermoplastic resin, and more preferably consists of 100 mass% of a thermoplastic resin.
Examples of the thermoplastic resin include polyolefin such as polyethylene and polypropylene; polyesters such as polyethylene terephthalate; polyamides such as nylon 6 and nylon 66; polyacrylic acid, polyalkylmethacrylate, polyvinyl chloride, polyvinylidene chloride, etc., 1 kind of them may be used alone or 2 or more kinds may be used in combination. The thermoplastic fibers may be short fibers or long fibers. Zxfoom zxfoom zxfoom zxfoom composite fibers such as core-sheath type or side-by-side type can also be used split fibers, profiled cross-section fibers, heat shrinkable fibers, and the like.
Zxfoom 5 zxfoom with configuration is worn on and disposed on the back of the wearer a lateral back side region 5b. Zxfoom zxfoom is outside of (a) dress(s) between the ventral region 5a and the dorsal region 5b a crotch region 5c arranged in the crotch of the wearer. In this example, the abdomen-side region 5a, the crotch region 5c, and the back-side region 5b are arranged along the longitudinal direction X. The outer body 5 has a shape that tapers inward in the transverse direction Y in the crotch region 5c. Thereby, leg opening portions 1L (see fig. 1) along the leg circumferences of the wearer are formed.
The outer edge of the outer body 5 is preferably formed to be line-symmetrical (left-right-symmetrical) with respect to the longitudinal center line CL
The outer body 5 has a lateral edge 5d of the lateral direction Y of the abdominal region 5a and a pair of side joint portions 8 joined to the lateral edge 5e of the lateral direction Y of the back region 5 b. That is, the right side joining portion 8 has a structure in which the right side edge portion 5d of the abdominal region 5a and the right side edge portion 5e of the back region 5b are joined so as to overlap each other in the thickness direction Z. The left side joining portion 8 has a structure in which a left side edge portion 5d of the abdominal region 5a and a left side edge portion 5e of the back region 5b are joined so as to overlap each other in the thickness direction Z.
The side joint portions 8 are preferably joined by heat sealing, ultrasonic sealing, or the like, as will be described in detail later.
[ Structure of side Joint ]
As shown in fig. 2, the pair of side joint portions 8 have a waist end portion 8a and a leg end portion 8b, respectively, which constitute both end portions in the longitudinal direction X.
The waist end 8a is the waist-side end of the side joint 8.
The leg end 8b is the leg-side end of the side joint 8.
Each side joint 8 has a structure extending from the waist end 8a to the leg end 8b in the longitudinal direction X as a whole.
The abdomen-side region 5a and the back-side region 5b form a tubular shape along the waist of the wearer by a pair of side joint portions 8 extending from the waist end portion 8a to the leg end portions 8b, respectively, to form a waist opening 1W and a leg opening 1L of the diaper 1. The side joining portions 8 preferably maintain the joined state without peeling of the abdominal region 5a and the back region 5b during the wearing operation and the wearing operation.
In the present specification, the case where the abdomen-side region 5a and the back-side region 5b of the side joint 8 are unintentionally separated at the time of the wearing operation and the time of wearing of the diaper 1 is referred to as "separation".
On the other hand, when changing the diaper 1 after wearing, from the viewpoint of sanitary disposal of excrement adhering to the diaper 1, there are cases where a caregiver or the like separates the abdomen-side region 5a and the back-side region 5b of the side joint 8, spreads the diaper 1, and then discards it.
In the present specification, the operation of intentionally separating the abdomen-side region 5a and the back-side region 5b of the side joint 8 by applying an external force to the side joint 8 and/or the periphery thereof at the time of disposal of the diaper 1 is referred to as "tearing".
As described above, the side joint portion 8 preferably has a structure that can prevent peeling at the time of wearing operation and at the time of wearing, and can be easily torn at the time of discarding.
From the above point of view, as shown in fig. 3, in the present embodiment, at least one of the side joint portions 8 includes a plurality of sealing portions S and a weld strength reducing agent 9. The pair of side joint portions 8 preferably have the same structure as described later, and the structure of one side joint portion 8 will be described in detail below.
In this specification, unless otherwise indicated, the dimensions and angles of the respective portions are measured in a natural state in which the elastic members of the respective portions are not stretched.
The sealing portion S is a portion where the thermoplastic sheets 50 of both the abdominal region 5a and the back region 5b are welded and joined. The sealing portion S is bonded by, for example, pressurizing means and/or heating means, specifically, heat sealing, ultrasonic sealing, or the like.
The plurality of sealing portions S are arranged at intervals in the longitudinal direction X and extend in the lateral direction Y.
By disposing the plurality of sealing portions S at intervals in the longitudinal direction X, when one sealing portion S peels off, the entire side joint portion 8 can be prevented from peeling off in the longitudinal direction X.
As shown in fig. 3, from the viewpoint of stabilizing the bonding strength of the entire side bonding portion 8, the plurality of sealing portions S are preferably arranged at equal intervals in the longitudinal direction X.
By "the sealing portion S extends in the lateral direction Y" is meant that the sealing portion S extends in the lateral direction Y as a whole by making the size of the sealing portion S in the lateral direction Y larger than the size of the longitudinal direction X. That is, the sealing portion S is not limited to the form extending in parallel in the lateral direction Y.
The sealing portion S includes an inner end Sc that is an end inside the lateral direction Y, and an outer end Sd that is an end outside the lateral direction Y.
The sealing portion S may include, for example, an upper end portion Sa extending in the lateral direction Y as an end portion on the waist end portion 8a side, and a lower end portion Sb extending in the lateral direction Y as an end portion on the leg end portion 8b side.
In the example shown in fig. 3, the sealing portion S is formed in a rectangular shape extending in the lateral direction Y in a plan view.
The weld strength reducing agent 9 is disposed between the thermoplastic sheets 50 of the outer body 5 and has a linear extending structure. The weld strength reducing agent 9 is disposed between the thermoplastic sheets 50 of the exterior body 5 at a position overlapping with a part of the sealing portion S, for example, before the sealing step for forming the sealing portion S. The weld strength reducing agent 9 prevents welding of the thermoplastic resin in the sealing step, and has a function of reducing the bonding strength of the sealing portion S. Specific examples of the weld strength reducing agent 9 will be described later.
The weld strength reducing agent 9 may be disposed between the thermoplastic sheets 50 included in the abdomen-side region 5a or between the thermoplastic sheets 50 included in the back-side region 5 b. Alternatively, the weld strength reducing agent 9 may be disposed between the skin-closest thermoplastic sheet 50 of the abdominal region 5a and the skin-closest thermoplastic sheet 50 of the back region 5b, which are opposed to each other at the side joint portions 8.
The term "the weld strength reducing agent 9 linearly extends" means that the weld strength reducing agent 9 linearly and/or curvedly extends.
As shown in fig. 3, the plurality of sealing portions S includes at least a first cross sealing portion S1 and a second cross sealing portion S2. The first and second intersecting sealing portions S1 and S2 are sealing portions S intersecting the welding strength reducing agent 9 in a plan view, among the plurality of sealing portions S, and have the following configuration.
The first and second cross seals S1 and S2 are disposed in the waist region 8c located within 25mm from the waist end 8 a. According to the findings of the inventors of the present invention, at the start of the tearing operation for discarding, the fingers of the caregivers and the like are easily arranged at the positions of about 25mm to 30mm from the waist opening end Wa on both sides in the lateral direction Y of the side joining portion 8. Therefore, the waist region 8c becomes a region to which an external force for tearing (also referred to as "tearing force") is particularly easily applied when discarded.
The first and second cross seals S1 and S2 are disposed adjacent to each other in this order from the waist end 8a side to the leg end 8b side. That is, the first cross seal S1 is disposed on the waist side, and the second cross seal S2 is disposed on the leg side.
As shown in fig. 3, the first cross seal S1 is not limited to the seal S located on the most waist side in the waist region 8c, and the first cross seal S1 and the second cross seal S2 may be disposed in the waist region 8 c.
From the viewpoint of preventing separation during the wearing operation and during wearing, the first and second cross-seal portions S1 and S2 cross the welding strength reducing agent 9 except the inner end portion Sc and the outer end portion Sd in a plan view.
That is, the welding strength reducing agent 9 crosses the first and second cross-seal portions S1 and S2 in a direction crossing the transverse direction Y, and extends from at least the upper end portion Sa of the first cross-seal portion S1 to the lower end portion Sb of the second cross-seal portion S2.
In the first and second cross-sealed portions S1 and S2, a portion overlapping the welding strength reducing agent 9 in a plan view is defined as a cross portion 9S, and the cross portion 9S is located between the inner end portion Sc and the outer end portion Sd, rather than between the inner end portion Sc and the outer end portion Sd.
The number of the intersecting portions 9S in the intersecting seal portions S1, S2 is preferably 1. For example, it is more preferable that 1 strip of the welding strength reducing agent 9 intersect the first intersecting seal S1 and the second intersecting seal S2 at 1 site in the side joint 8.
From the viewpoint of improving the ease of tearing at the time of disposal, the side joint 8 including the first and second cross seals S1 and S2 satisfies the following formula (1).
5 degrees < alpha 1 < alpha 2< alpha 3 < alpha 4<90 degrees … (1)
In the above formula (1), the crossing angle between the weld strength reducing agent 9 and the first crossing seal portion S1 on the waist end 8a side and inside in the lateral direction Y is defined as α1. In the example shown in fig. 3, the crossing angle α1 is the crossing angle between the welding strength reducing agent 9 and the upper end portion Sa of the first cross seal S1 inside in the lateral direction Y.
The crossing angle between the welding strength reducing agent 9 and the first crossing seal portion S1 on the leg end 8b side and outside in the lateral direction Y is defined as α2. In the example shown in fig. 3, the crossing angle α2 is the crossing angle between the welding strength reducing agent 9 and the lower end Sb of the first cross seal S1 outside in the lateral direction Y.
The crossing angle between the welding strength reducer 9 and the second crossing seal portion S2 on the waist end 8a side and inside in the lateral direction Y is defined as α3. In the example shown in fig. 3, the crossing angle α3 is the crossing angle between the welding strength reducing agent 9 and the upper end portion Sa of the second cross seal S2 inside in the lateral direction Y.
The crossing angle between the welding strength reducer 9 and the second crossing seal portion S2 on the leg end 8b side and outside in the lateral direction Y is defined as α4. In the example shown in fig. 3, the crossing angle α4 is the crossing angle between the welding strength reducing agent 9 and the lower end Sb of the second cross seal S2 outside in the lateral direction Y.
The crossing angle between the welding strength reducing agent 9 and each of the crossing seals S1 and S2 is an angle between the side edge portion of the welding strength reducing agent 9 in the lateral direction Y and the upper end portion Sa (inner side) or the lower end portion Sb (outer side) of each of the crossing seals S1 and S2. When the welding strength reducing agent 9 is curved, the crossing angle is an angle between a tangent line of the welding strength reducing agent 9 at the lateral edge portion of the transverse direction Y and the upper end portion Sa or the lower end portion Sb at the crossing point of the lateral edge portion of the welding strength reducing agent 9 and the upper end portion Sa or the lower end portion Sb.
[ effects of the above Structure ]
In the above-described structure, in the side joint portion 8, the welding strength reducing agent 9 crosses the first cross seal portion S1 and the second cross seal portion S2 located in the waist region 8 c. Thereby, the bonding strength at the portion (crossing portion 9S) of the first crossing seal portion S1 and the second crossing seal portion S2 crossing the welding strength reducing agent 9 is reduced. Therefore, the joining strength of the waist region 8c to which the tearing force is easily applied directly at the time of disposal can be reduced, and tearing of the side joining portion 8 can be facilitated.
The welding strength reducing agent 9 does not overlap the inner end Sc and the outer end Sd of the first and second cross-seal portions S1 and S2. In this way, when a finger of a caregiver or the like who lifts up the pants-type absorbent article is in contact with the outer end portion Sd of the first cross seal S1 and/or the second cross seal S2 during the wearing operation, the seal S can be prevented from being peeled off from the outer end portion Sd. In addition, when the abdomen circumference of the wearer greatly fluctuates during wearing, and a force in the lateral direction Y is applied to the inner end Sc of the first and second cross seal portions S1 and S2, the seal portion S can be prevented from being peeled off from the inner end Sc.
Therefore, with the above configuration, the peeling of the side joint 8 during the wearing operation and during wearing can be effectively prevented.
Further, the side joint portion 8 satisfies the above formula (1), and the welding strength reducing agent 9 forming the weak joint portion is extended in a preferable direction, so that the tearing easiness at the time of disposal can be improved.
When tearing the side joint 8 at the time of disposal, first, fingers of both hands of a care giver or the like are arranged on both sides in the lateral direction Y in the vicinity of the waist region 8c of the side joint 8. In this state, a tearing force in the lateral direction Y is applied to the abdominal region 5a and the back region 5b of the waist region 8 c. Thereby, the sealing portion S on the waist end 8a side is torn. Next, a tearing force in the longitudinal direction X is applied to the side joint portion 8 from the waist end portion 8a side to the leg end portion 8b side, and the sealing portion S is sequentially torn from the waist end portion 8a side to the leg end portion 8b side.
The side joint 8 satisfies the above formula (1), and the intersection angles α3, α4 between the second intersection seal S2 and the welding strength reducing agent 9 are larger than the intersection angles α1, α2 between the first intersection seal S1 and the welding strength reducing agent 9. That is, in the first cross seal S1, the extending direction of the welding strength reducing agent 9 is a direction inclined with respect to the longitudinal direction X, and in the second cross seal S2, the extending direction of the welding strength reducing agent 9 changes in a direction nearly parallel to the longitudinal direction X. Thus, tearing in the transverse direction Y is easily induced in the first cross seal S1, and tearing in the direction approaching the longitudinal direction X is easily induced in the second cross seal S2. The upper end portion Sa of each of the cross seals S1, S2 becomes a portion to which the tearing force is initially applied in each of the cross seals S1, S2. Therefore, by changing the intersection angles α1, α3 on the upper end portion Sa side, the change in the direction of easy tearing is easily perceived by the caregivers or the like. Therefore, the weld strength reducing agent 9 can induce tearing in a preferable direction from the lateral direction Y to the longitudinal direction X, and a caregiver or the like can tear the side joint portion 8 more easily.
In addition, by satisfying 5 degrees < α1 and α4<90 degrees, it is possible to suppress the angular change of the welding strength reducing agent 9 within a range where the tearing easiness can be ensured, and to reliably intersect the welding strength reducing agent 9 with the first intersecting seal S1 and the second intersecting seal S2.
As described above, according to the above-described structure, both prevention of peeling of the side joining portion 8 during the wearing operation and easy tearing at the time of disposal can be achieved.
From the viewpoint of inducing tearing in a more preferable direction, the side joint 8 including the first and second cross seals S1 and S2 preferably satisfies the following formula (1)'.
5 degrees < α1< α2< α3< α4<90 degrees … (1)'
The side joining portion 8 satisfies the above formula (1)', and the crossing angles α1, α2, α3, and α4 of the weld strength reducing agent 9 gradually become larger as going from the waist end portion 8a side of the first crossing seal portion S1 toward the leg end portion 8b side of the second crossing seal portion S2. As a result, tearing in the longitudinal direction X can be induced more smoothly as going from the upper end portion Sa of the first cross seal S1 to the lower end portion Sb of the second cross seal S2. Therefore, tearing of the weld strength reducing agent 9 from the transverse direction Y to the preferred direction of the longitudinal direction X can be induced more effectively, and the ease of tearing of the side joint portion 8 can be improved.
[ structural example of exterior body ]
As shown in fig. 4, the outer body 5 preferably includes an outer layer sheet 51 and an inner layer sheet 52 as the plurality of thermoplastic sheets 50. The outer sheet 51 is preferably disposed on the non-skin side of the inner sheet 52 to form a non-skin-facing surface of the outer body 5. The elastic member 10 described later is preferably disposed between the inner layer sheet 52 and the outer layer sheet 51.
In the present embodiment, at least a part of the outer body 5 is folded back from the waist opening end Wa toward the skin side, whereby the outer body 5 has a folded-back structure. In the example shown in fig. 4, only the outer sheet 51 is folded back from the waist end 8a toward the skin side.
In the cross-sectional view of fig. 4, for the sake of explanation, the abdomen-side region 5a and the back-side region 5b of the side joint 8 are separated.
In the example shown in fig. 4, the waist region 8c is disposed in a region including the folded-back structure of the outer body 5.
In this case, in the waist region 8c, among the plurality of thermoplastic sheets 50 of the outer body 5, the skin-side sheet P constituting the skin-facing surface is the folded-back outer sheet 51, and the adjacent sheet Q adjacent to the skin-side sheet P is the inner sheet 52.
The skin-side sheet P is the sheet closest to the skin in the waist region 8c of each of the abdominal region 5a and the back region 5 b. The skin-side sheet P of the abdominal region 5a and the skin-side sheet P of the back region 5b are in contact and sealed in a state of facing each other. That is, the skin-facing surface of the skin-side sheet P serves as the joining interface of the side joining portion 8.
[ example of the arrangement of the weld Strength reducing agent ]
The weld strength reducing agent 9 is preferably disposed in the following manner from the viewpoint of reducing the bonding strength of the sealing portion S more effectively.
As shown in fig. 4, the weld strength reducing agent 9 is preferably disposed between the skin-side sheet P and the adjacent sheet Q in the waist region 8 c. In the example shown in fig. 4, the welding strength reducing agent 9 is disposed in the abdomen-side region 5a, but may be disposed in the back-side region 5b, or may be disposed in both the abdomen-side region 5a and the back-side region 5 b.
Thus, the weld strength reducing agent 9 is disposed between the skin-side sheet P, which becomes the joining interface at the time of sealing, and the adjacent sheet Q adjacent thereto. Therefore, the welding inhibition effect between the abdominal region 5a and the back region 5b due to the welding strength reducing agent 9 is easily exerted, and the joint strength of the intersecting portion 9s can be effectively reduced. As a result, the tearing easiness can be further improved.
From the viewpoint of further improving the tearing ease, the penetration depth of the weld strength reducing agent 9 in the skin-side sheet P is preferably deeper than the penetration depth of the weld strength reducing agent 9 in the adjacent sheet Q.
The penetration depth is the penetration depth of the weld strength reducing agent 9 from the coating surface to the sheet thickness direction. The penetration depth can be measured as follows.
< method for measuring penetration depth of weld Strength-reducing agent >
The side joint 8 of the measurement object was cut and cut in the longitudinal direction X and the transverse direction Y, and a measurement piece exhibiting a cross section of the weld strength reducing agent 9 was produced. Next, an enlarged image of the cross section of the side joint portion 8 in the measuring sheet was taken with a microscope VHX1000 manufactured by KEYENCE corporation at a magnification of 200 times, and an image of the observation field was obtained. In the above observation field, the portion into which the weld strength reducing agent 9 is permeated is observed as a portion that emits light transparently, and therefore, it is possible to determine the outline of the portion and measure the area of the region surrounded by the outline. The measurement was performed for 5 portions of the waist region 8c, and the average value of these was used as the penetration depth of the weld strength reducing agent 9 in the waist region 8 c.
As a result, the weld strength reducing agent 9 is easily moved from the non-skin-facing surface of the skin-side sheet P to the skin-facing surface that is the joining interface, and the weld inhibition effect by the weld strength reducing agent 9 can be more effectively exerted. Thus, the ease of tearing can be more effectively improved.
[ structural example of Cross seal ]
The first and second cross-seal portions S1 and S2 are not limited to the configuration shown in fig. 3, as long as they are seal portions S disposed in the waist region 8 c.
As illustrated in fig. 5, the first cross seal S1 is preferably a seal S disposed at a position closest to the waist end 8a among the plurality of seals S. Thereby, the sealed portion S closest to the waist end portion 8a crosses the weld strength reducing agent 9 as the first crossing sealed portion S1. Therefore, the side joint portion 8 is easily torn from a position closer to the waist end portion 8a, and the ease of tearing can be improved.
In addition, from the viewpoint of improving the ease of tearing in the longitudinal direction X, the plurality of sealing portions S may include 3 or more intersecting sealing portions.
For example, the plurality of sealing portions S preferably include 3 or more n cross sealing portions S1, S2, …, sn including the first cross sealing portion S1 and the second cross sealing portion S2 as sealing portions S crossing the welding strength reducing agent 9.
In the example shown in fig. 5, the plurality of sealing portions S includes a first cross sealing portion S1, a second cross sealing portion S2, and a third cross sealing portion S3.
In the following description, the cross-seal portions S2, …, and Sn are also referred to as cross-seal portions Sk.
N is an integer of 3 or more, and k is an integer of 2 or more and n or less.
In this case, the side joint 8 including 3 or more cross seals S1, S2, …, sn preferably satisfies the following formulas (2) and (3).
α(2(k-1)-1)≤α(2(k-1))<α(2k-1)≤α(2k)… (2)
Alpha 1 is less than or equal to 5 degrees and alpha 2 is less than or equal to …, alpha (2 n-1) is less than or equal to alpha (2 n) and is less than or equal to 90 degrees … (3)
In the example shown in fig. 5, when n=3, the following expression (3) "holds according to expressions (2) and (3).
5 degrees < alpha 1 < alpha 2< alpha 3 < alpha 4< alpha 5 < alpha 6 < 90 degrees … (3)') "
In the above formulas (2) and (3), the crossing angle between the kth crossing seal Sk on the leg end 8b side from the first crossing seal S1 and the weld strength reducing agent 9 on the waist end 8a side and on the inner side in the lateral direction Y is set to α (2 k-1). That is, the crossing angle α (2 k-1) is the crossing angle between the welding strength reducing agent 9 and the upper end portion Sa of the kth crossing seal portion Sk, which is inside in the lateral direction Y.
The intersection angle between the kth intersection sealed portion Sk and the welding strength reducing agent 9 on the leg end 8b side and outside in the lateral direction Y is set to α (2 k). That is, the crossing angle α (2 k) is the crossing angle of the welding strength reducing agent 9 and the lower end Sb of the kth crossing seal Sk outside the transverse direction Y.
That is, the expression (2) shows that the intersecting angle α (2 k-1) and the intersecting angle α (2 k) of the kth intersecting seal Sk next are larger than the intersecting angle α (2 (k-1) -1) and the intersecting angle α (2 (k-1)) of the (k-1) th intersecting seal S (k-1).
Equation (3) shows that the intersection angle α1 of the first intersection sealed portion S1 on the side closest to the waist end portion 8a is greater than 5 degrees, and the intersection angle α (2 n) of the intersection sealed portion Sn on the side closest to the leg end portion 8b is 90 degrees or less.
The side joint portion 8 satisfies the equation (2), and the crossing angle of the welding strength reducing agent 9 gradually increases as the crossing seal portion Sn goes from the first crossing seal portion S1 to the leg portion end portion 8b side. That is, in the first cross seal S1, the extending direction of the welding strength reducing agent 9 is a direction inclined with respect to the longitudinal direction X, and the extending direction of the welding strength reducing agent 9 changes in a direction nearly parallel to the longitudinal direction X as the cross seal Sk toward the leg portion side is moved. As a result, the first cross seal S1 is likely to be torn in the lateral direction Y, and is likely to be torn in the direction approaching the longitudinal direction X as the cross seal Sk goes toward the leg portion side. Therefore, the weld strength reducing agent 9 can induce tearing in a preferable direction, and can induce longer tearing in the longitudinal direction X, and can further improve the ease of tearing of the side joint portion 8.
In addition, by satisfying 5 degrees < α1 and α (2 n) +.90 degrees, the angular change of the weld strength reducing agent 9 can be suppressed within a range that can ensure easy tearing. Further, by satisfying α (2 n). Ltoreq.90 degrees, the tearing direction does not return from the outside to the inside in the lateral direction Y, and stable tearing operation can be realized.
Further, from the viewpoint of inducing tearing in a more preferable direction, the side joining portions 8 including 3 or more cross-sealing portions S1, S2, …, sn more preferably satisfy the following formulas (2) 'and (3)'.
α(2(k-1)-1)<α(2(k-1))<α(2k-1)<α(2k)… (2)'
5 degrees < alpha 1< alpha 2< … < alpha (2 n-1) < alpha (2 n) < 90 degrees … (3) < alpha (2 n)'
By the side joining portions 8 satisfying the formulas (2) 'and (3)', the crossing angle of the welding strength reducing agent 9 gradually increases from the waist end portion 8a side of the first cross-sealing portion S1 toward the leg end portion 8b side of the nth cross-sealing portion Sn. That is, on the upper end portion Sa side of the first cross seal S1, the extending direction of the welding strength reducing agent 9 is inclined with respect to the longitudinal direction X, and the extending direction of the welding strength reducing agent 9 gradually changes in a direction nearly parallel to the longitudinal direction X as going toward the lower end portion Sb of the cross seal Sn on the leg end portion 8b side. Thus, tearing in the direction approaching the longitudinal direction X can be more smoothly and easily stably induced.
In addition, from the viewpoint of further improving the ease of tearing, it is preferable that all the seal portions S located in the cross region 8d within 10mm from the upper end portion Sa of the first cross seal portion S1 on the leg end portion 8b side are configured as cross seal portions Sk crossing the weld strength reducing agent 9.
In fig. 5, for the sake of explanation, the size of the intersection region 8d is shown larger than the actual size with respect to the size of the waist region 8 c.
The cross region 8d within 10mm from the first cross seal S1 on the leg end 8b side is located in the vicinity of a region where the fingers of a carer or the like who performs disposal are easily disposed, and is also a region where the force in the lateral direction Y is particularly easily applied at the start of the tearing operation. By configuring the entire sealing portion S of the cross region 8d as the cross sealing portion Sk, the bonding strength of the cross region 8d can be reliably reduced, and tearing at the start of the tearing operation can be performed with a weak force. Therefore, the tearing force can be prevented from becoming too strong, and the exterior body 5 itself can be prevented from being broken.
In this case, the distance ak from the end portion (inner end portion Sc) on the inner side in the lateral direction Y to the crossing portion 9s with the welding strength reducing agent 9 preferably becomes gradually larger as the crossing seal portion Sk in the crossing region 8d goes toward the leg end portion 8b side. In this case, the intersecting portion 9s of all the intersecting seal portions Sk in the intersecting region 8d preferably does not overlap with the end portion (outer end portion Sd) on the outer side in the lateral direction Y in a plan view.
The distance ak from the inner end portion Sc to the intersecting portion 9s means a distance in the lateral direction Y from the inner end portion Sc to a portion of the intersecting portion 9s furthest inward in the lateral direction Y.
That is, in the above configuration, when k is an integer of 2 or more, the following expression (4) is established with respect to the distance a (k-1) from the first cross seal S1 to the (k-1) th cross seal S (k-1) and the distance ak from the first cross seal S1 to the kth cross seal Sk.
a(k-1)<ak… (4)
The length of the cross seal Sk in the lateral direction Y is Ak. The length Ak is a dimension in the transverse direction Y from the inner end Sc to the outer end Sd of the cross seal Sk. In this case, the following expression (5) holds in all the cross seal portions Sk in the cross region 8 d.
ak<Ak… (5)
In the above-described configuration, in the crossing region 8d, the crossing portion 9s, which is a weak joint portion, is disposed gradually outward in the lateral direction Y as going from the waist end portion 8a side toward the leg end portion 8b side. Thus, by applying a tearing force to the cross region 8d in the lateral direction Y, all the cross seal Sk in the cross region 8d can be efficiently torn off. Therefore, in particular, the intersecting region 8d to which the force at the start of tearing is applied can be smoothly torn with a weak force, and the ease of tearing can be improved.
[ dimensional example of seal portion ]
The following examples are given as examples of the size of the seal portion S including the first and second cross seal portions S1 and S2 from the viewpoint of both preventing the peeling and the tearing easiness at the time of wearing and at the time of wearing. As described above, the following dimensions are dimensions in a natural state in which the elastic member is not stretched.
The length of the sealing portion S in the lateral direction Y is preferably 0.5mm or more, more preferably 1mm or more, still more preferably 10mm or less, still more preferably 4mm or less, still more preferably 0.5mm or more and 10mm or less, still more preferably 1mm or more and 4mm or less.
The length of the sealing portion S in the longitudinal direction X is preferably 0.1m or more, more preferably 0.3mm or more, still more preferably 2mm or less, still more preferably 0.6mm or less, still more preferably 0.1mm or more and 2mm or less, still more preferably 0.3mm or more and 0.6mm or less.
The length of the sealing portion S in the lateral direction Y is preferably 100% or more, more preferably 400% or more, still more preferably 1000% or less, still more preferably 800% or less, still more preferably 100% or more and 1000% or less, still more preferably 400% or more and 800% or less, with respect to the length of the sealing portion S in the longitudinal direction X.
The distance in the longitudinal direction X between adjacent sealing portions S is preferably 0.1mm or more, more preferably 1mm or more, still more preferably 10mm or less, still more preferably 4mm or less, still more preferably 0.1mm or more and 10mm or less, still more preferably 1mm or more and 4mm or less.
[ structural example of elastic Member ]
As shown in fig. 2, the abdomen-side region 5a and the back-side region 5b of the exterior body 5 include a plurality of elastic members 10 extending in the lateral direction Y.
The plurality of elastic members 10 are arranged between the plurality of thermoplastic sheets 50 of the outer body 5. In the example shown in fig. 4, the plurality of elastic members 10 are arranged between the outer sheet 51 and the inner sheet 52.
By these elastic members 10, stretchability is exhibited in the waist of the diaper 1, and the wearing operation is facilitated, so that the fit during wearing can be maintained.
Further, "the elastic member 10 extends in the lateral direction Y" means that the elastic member 10 extends in the lateral direction Y in the deployed and extended state. However, the expression is not limited to the form in which the elastic member 10 is parallel in the transverse direction Y in the developed and extended state, but includes the form in which the elastic member extends in the transverse direction Y as a whole.
As shown in fig. 2, the outer body 5 includes, in addition to the elastic member 10, an elastic member 11 for leg portions disposed around the leg opening 1L.
The elastic members 10 and 11 may be preferably filament-like (rubber filaments or the like) or thread-like (rubber strips or the like) elastic members having rectangular, square, circular, polygonal cross-sections or the like, multifilament-like filament-like elastic members or the like. The material of the elastic members 10 and 11 is not particularly limited, and materials conventionally used in absorbent articles such as disposable diapers and the like can be used, and examples thereof include synthetic rubbers such as styrene-butadiene, isoprene and chloroprene rubber, natural rubber, EVA, stretchable polyolefin and polyurethane.
The lateral outer end portions of the elastic members 10 in the abdominal region 5a and the back region 5b are preferably located at or near the side joint portions 8 from the viewpoint of securing stretchability of the entire waist. Specifically, the distance between the end portion and the side joint portion 8 in the lateral direction Y is preferably 10mm or less, more preferably 0mm, and the end portion is located in the side joint portion 8.
The elastic member 10 is generally disposed in the vicinity of or in the region where the force is applied during tearing, and is likely to affect the ease of tearing during disposal.
Therefore, from the viewpoint of improving the ease of tearing at the time of disposal, it is preferable that the elongation of the elastic member is adjusted as follows.
As shown in fig. 2, the abdominal region 5a and the back region 5b are divided into a waist stretch region 5f and a leg stretch region 5g, respectively. These areas are areas divided by the envisaged boundary line located 25mm in the longitudinal direction X from the waist-opening end Wa and extending in parallel in the transverse direction Y. That is, the waist stretch region 5f is located from the waist opening end Wa to a position within 25mm therefrom in the longitudinal direction X. The lateral Y side edge portions of the waist stretch region 5f correspond to the above-described waist region 8c. The leg-side extension/contraction region 5g is located closer to the leg side than the waist extension/contraction region 5f in the longitudinal direction X. Further, a boundary line dividing the waist stretchable region 5f and the leg-side stretchable region 5g is set to a line extending parallel to the lateral direction Y at a position 25mm in the longitudinal direction X from the waist opening end Wa in the unfolded and elongated state.
The waist stretch region 5f includes a plurality of elastic members 10 extending in the lateral direction Y. Similarly, the leg-side stretchable region 5g includes a plurality of elastic members 10 extending in the lateral direction Y. The average elongation of the plurality of elastic members 10 in the waist stretch region 5f is preferably lower than the average elongation of the plurality of elastic members 10 in the leg stretch region 5 g.
The elongation of the elastic member 10 is a ratio of the length of the elastic member that is elongated in the unfolded and elongated state of the pant-type absorbent article to the length of the naturally long elastic member that is taken out from the pant-type absorbent article.
That is, the lower the elongation, the lower the elastic force tends to be when the elastic member 10 is stretched.
The elongation of the elastic member 10 can be adjusted by adjusting the degree of elongation of the elastic member 10 disposed on the outer body 5 at the time of manufacturing. In the production, for example, the elastic member 10 is stretched to a predetermined length, and an adhesive is applied to the elastic member 10 by a comb or the like to fix the elastic member 10 to the thermoplastic sheet 50 of the outer body 5.
As described above, the force in the lateral direction Y is easily applied directly to the waist region 8c at the time of the tearing operation. In the above-described structure, since the average elongation of the elastic member 10 in the waist stretch region 5f is low, the elastic force of the elastic member 10, which becomes resistance to the tearing force, becomes low. This makes it possible to efficiently tear the elastic member 10 with a weak force, since the energy involved in the tearing force is not easily consumed by the elongation of the elastic member. Therefore, the above-described structure can realize a stable tearing operation, and can prevent a failure such as breakage of the outer case 5 due to an excessively strong tearing force.
< method for measuring average elongation of elastic Member >
The side joint 8 of the pants-type absorbent article is separated and detached from the absorbent main body 4, and the abdomen-side region 5a and the back-side region 5b of the outer body 5 are cut out. The waist-opening ends Wa of the abdomen-side region 5a and the back-side region 5b are cut parallel to the lateral direction Y at positions 25mm apart from each other in the longitudinal direction X, and the waist-extension region 5f and the leg-side extension region 5g are cut.
Then, the length of the elastic member 10 of each cut region in the unfolded and elongated state of the pant-type absorbent article was measured. From this measurement value, an average value of the lengths of the maximum extension states of all the elastic members 10 in the respective regions 5f, 5g is calculated.
All the elastic members 10 fixed to the respective regions 5f and 5g by an adhesive or the like are removed from the other constituent members of the exterior body 5 by an appropriate solvent such as ethyl acetate, and the lengths of the naturally long elastic members 10 of the respective regions 5f and 5g are measured. From this measurement value, the average value of the lengths of all the natural-length elastic members 10 in the respective regions 5f and 5g is calculated.
Then, the ratio of the average value of the lengths of the elastic members 10 in the expanded and elongated state to the average value of the lengths of the elastic members 10 in the natural length in each of the regions 5f and 5g is calculated as the average elongation of the elastic members 10 in each of the regions 5f and 5g.
The average elongation of the plurality of elastic members 10 in the waist region 5f is preferably 120% or more, more preferably 130% or more, preferably 500% or less, more preferably 450% or less.
The average elongation of the plurality of elastic members 10 in the leg stretch region 5g is preferably 150% or more, more preferably 180% or more, preferably 550% or less, more preferably 500% or less.
The ratio of the average elongation of the plurality of elastic members 10 in the waist stretch region 5f to the average elongation of the plurality of elastic members 10 in the leg stretch region 5g is preferably 20% or more, more preferably 30% or more, still more preferably 90% or less, and still more preferably 80% or less, from the viewpoint of effectively obtaining the above-described action effect.
[ structural example of weld Strength-reducing agent in plan view ]
From the viewpoint of achieving a more stable tearing operation, the weld strength reducing agent 9 preferably has the following structure in plan view.
As shown in fig. 3, it is preferable that the width b1 of the first cross seal S1 in the transverse direction Y of the cross section 9S of the weld strength reducing agent 9 is substantially the same as the width b2 of the second cross seal S2 in the transverse direction Y of the cross section 9S of the weld strength reducing agent 9.
The widths b1 and b2 of the cross section 9s in the cross direction Y of the upper end portion Sa can be an average value of the width of the cross section 9s in the cross direction Y of the lower end portion Sb and the width of the cross section 9s in the cross direction Y of the lower end portion Sb.
The above-mentioned widths "substantially the same" mean that, when the minimum width among the widths of all the intersections 9s is set to 100%, the width of each intersection 9s converges to 150% or less.
In the above configuration, the variation in the widths b1 and b2 of the intersecting portions 9S, which are weak bonding portions, is suppressed, and the variation in the bonding strength of the intersecting sealing portions S1 and S2 can be suppressed. This can prevent a caregivers who discard the pants-type absorbent article from feeling uncomfortable during tearing. Therefore, the caregivers and the like can be prevented from applying a strong tearing force more than necessary, and the exterior body 5 is prevented from being broken.
Further, by stabilizing the widths b1 and b2 of the intersecting portions 9S, a significant decrease in the bonding strength of the intersecting sealing portions S1 and S2 can be suppressed, and peeling of the side bonding portions 8 during the wearing operation and during wearing can be prevented more reliably.
As illustrated in fig. 5, when the plurality of sealing portions S includes 3 or more n cross sealing portions S1, S2, …, and Sn, it is preferable that the widths of all the cross sealing portions S1, S2, …, and Sn in the transverse direction Y are substantially the same as the width of the cross portion 9S of the welding strength reducing agent 9.
This can improve the stability of the tearing operation as well as the ease of tearing in the longitudinal direction X.
Specifically, the width of the intersecting portion 9s in the transverse direction Y is preferably 5% or more, more preferably 10% or more, still more preferably 60% or less, and still more preferably 50% or less, with respect to the length of the intersecting seal portion Sk in the transverse direction Y.
The width of the intersecting portion 9s in the transverse direction Y is preferably 0.1mm or more, more preferably 0.2mm or more, preferably 1.5mm or less, more preferably 1.2mm or less.
The dimensions of the intersecting portion 9s and the dimensions of the intersecting seal portion Sk are measured as the dimensions in the maximum elongation state.
As shown in fig. 6 (a) and (B), the weld strength reducing agent 9 is preferably formed in a curved shape. In this case, for example, the weld strength reducing agent 9 is preferably formed of at least a part of a spiral or corrugated curve.
For example, the weld strength reducing agent 9 may preferably extend to the inside in the lateral direction Y of the side joint portion 8 as a whole, and the entire planar shape thereof may be a spiral shape or a corrugated curved shape. It is preferable that the weld strength reducing agent 9 is disposed in the side joint 8 by at least a part of a spiral or corrugated curve thereof so as to satisfy the above-described expression (1) and the like.
The spiral or corrugated curve forming the weld strength reducing agent 9 has a shape in which a plurality of unit shapes 9a, 9b are repeatedly arranged in one direction.
Fig. 6 (a) shows an example in which the curve of the weld strength reducing agent 9 is spiral. The spiral shape as referred to herein is a shape in which a shape close to a circle or an ellipse is taken as one unit shape 9a, and a plurality of unit shapes 9a are repeatedly arranged in one direction. In fig. 6 (a), the nearly elliptical cell shape 9a is repeatedly arranged in the lateral direction Y. In fig. 6 (a), each cell shape 9a is formed in a closed loop shape, but a part of one cell shape 9a may be connected to an adjacent cell shape 9a, and a plurality of cell shapes 9a may be formed continuously.
Fig. 6 (B) shows an example in which the curve of the weld strength reducing agent 9 is corrugated. The wavy shape is a shape in which one unit shape 9b is a shape that undulates convexly in one direction and in the opposite direction, and a plurality of unit shapes 9b are repeatedly arranged in other directions.
The weld strength reducing agent 9 is formed in the curve as described above, and thus can induce smooth tearing, and can suppress local concentration of the tearing force. This can prevent caregivers who discard the pants-type absorbent articles from feeling uncomfortable during tearing, and can prevent caregivers from applying a strong tearing force more than necessary, and the outer cover 5 from being broken.
Further, it is preferable that the spiral or corrugated curve of the weld strength reducing agent 9 extends in the lateral direction Y. That is, the curve is preferably arranged in the lateral direction Y in the plurality of cell shapes 9a and 9 b. This can realize the weld strength reducing agent 9 having a shape satisfying the above formula (1) and having a smooth curve.
In this case, the cell shapes 9a and 9b preferably have a dimension in the longitudinal direction X larger than a dimension in the transverse direction Y. The cell shapes 9a and 9b are formed by overlapping at least a part of the cell shapes 9a and 9b with the side joint 8 or by adjacent cell shapes 9a and 9 b. The dimension in the longitudinal direction X is the maximum dimension in the longitudinal direction X of the unit shapes 9a and 9b, and the dimension in the transverse direction Y is the maximum dimension in the transverse direction Y of the unit shapes 9a and 9 b.
For example, in the spiral curve shown in fig. 6 (a), the dimension c1 of the unit shape 9a in the longitudinal direction X is larger than the dimension c2 in the transverse direction Y.
Similarly, for example, in the corrugated curve illustrated in fig. 6 (B), the dimension d1 of the cell shape 9B in the longitudinal direction X is larger than the dimension d2 of the cell shape in the lateral direction Y.
In this way, the cell shapes 9a and 9b are formed longer in the longitudinal direction X, and tearing in the longitudinal direction X is more easily induced, thereby improving the ease of tearing.
[ concrete example of weld Strength reducing agent ]
The weld strength reducing agent 9 may be used without particular limitation, and may suppress the influence of heat applied during the sealing step, which is the step of forming the sealing portion S. Examples of such a substance include a hot melt adhesive, a polyurethane material, and a petroleum resin.
The weld strength reducing agent 9 is preferably a hot melt adhesive from the viewpoint of reducing heat generated in the sealing process and joining the sheets to each other. As the hot melt adhesive, for example, a styrene-based (SIS, SBS, SEBS) or polyolefin-based material can be used.
The method of disposing the weld strength reducing agent 9 is not particularly limited, and a method of applying the weld strength reducing agent 9 using a coating gun is preferable. This makes it possible to easily control the application shape, grammage, and the like of the welding strength reducing agent 9, and to easily control the bonding strength.
[ structural example of a pair of side Joint portions ]
Tearing of the side joint 8 by a caregiver or the like is generally performed for both the left and right side joints 8. Therefore, it is preferable that each of the pair of side joint portions 8 includes the first cross seal S1 and the second cross seal S2, and is configured so as to satisfy the formula (1).
In other words, when one of the pair of side joining portions 8 is a first side joining portion and the other is a second side joining portion, the second side joining portion preferably has the same structure as the first side joining portion.
Here, the pair of side joint portions 8 are configured substantially line symmetrically with respect to the longitudinal center line CL, for example, and each will be described as a member having the structure shown in fig. 3.
Specifically, the pair of side joint portions 8 preferably includes: a plurality of sealing parts S arranged at intervals in the longitudinal direction X and extending in the transverse direction Y, and a linearly extending weld strength reducing agent 9 arranged between the thermoplastic sheets 50.
In this case, the plurality of sealed portions S of each of the pair of side joint portions 8 preferably include a first cross sealed portion S1 and a second cross sealed portion S2, which are sealed portions S disposed in the waist region 8c located within 25mm from the waist end portion 8a, and which cross the weld strength reducing agent 9 at a portion other than the inner end portion Sc and the outer end portion Sd in a plan view.
In this case, the first and second cross seals S1 and S2 of the pair of side joint portions 8 are disposed adjacent to each other in this order from the waist end portion 8a side toward the leg end portion 8b side.
In this case, the pair of side joint portions 8 preferably satisfy the above expression (1), respectively. The following formula (1) is described again.
5 degrees < alpha 1 < alpha 2< alpha 3 < alpha 4<90 degrees … (1)
In the above formula (1), the crossing angle between the weld strength reducing agent 9 and the first crossing seal portion S1 on the waist end 8a side and on the inner side in the lateral direction Y is α1. The crossing angle between the welding strength reducing agent 9 and the first crossing seal portion S1 on the leg end 8b side and on the outside in the lateral direction Y is α2. The crossing angle between the welding strength reducing agent 9 and the second crossing seal portion S2 on the waist end 8a side and on the inner side in the lateral direction Y is α3. The crossing angle between the welding strength reducing agent 9 and the second crossing seal portion S2 on the leg end 8b side and on the outside in the lateral direction Y is set to α4.
This can improve the ease of tearing of the side joining portions 8 on both the left and right sides.
[ structural example of skin side sheet of outer garment ]
Referring to fig. 7, in the waist region 8c, the skin-side sheet P constituting the skin-facing surface of the outer body 5 is preferably made of a spunbonded nonwoven fabric from the viewpoint of improving the tearing ease. The spunbond nonwoven fabric preferably contains polyolefin such as polyethylene and polypropylene, more preferably polypropylene, among the thermoplastic resins described above, from the viewpoint of sheet formability. Examples of polypropylene include α -olefins.
The spunbond nonwoven fabric used for the skin-side sheet P preferably contains a plurality of embossed portions 12 from the viewpoint of reliably welding the fibers to each other to form a sheet. The embossed portion 12 is a portion where the fibers are welded by crimping. The embossed portion 12 can be exemplified by a portion formed intermittently by thermocompression bonding by an embossing roller, a flat roller, or the like, a portion formed by ultrasonic welding, a portion formed by intermittently applying hot air to partially weld them, or the like. From the viewpoints of high productivity and low equipment cost, it is preferable that the embossed portion 12 be formed by thermocompression bonding.
The planar shape of the embossed portion 12 may take any shape such as a circle, an ellipse, a polygon, or the like.
The embossed portions 12 are preferably formed in a certain pattern, but may be formed in a random pattern. In fig. 7, the embossed portions 12 are arranged at substantially constant intervals (pitch) in the longitudinal direction X and the transverse direction Y, and each row in the transverse direction Y is arranged offset from each other by half a pitch from each other adjacent row.
In the embossed portion 12, the fibers are easily cut by the heat treatment and/or the processing treatment at the time of formation, and therefore, the bonding strength of the region of the sealing portion S overlapping the embossed portion 12 is reduced as compared with the region not overlapping. Therefore, from the viewpoint of further improving the ease of tearing, it is preferable that the first and second cross-seal portions S1 and S2 are arranged in the overlapping portions 12S of the embossed portions 12 as follows.
The first and second cross seals S1 and S2 preferably overlap at least 1 embossed portion 12 except the inner end Sc and the outer end Sd, respectively, in plan view.
That is, in the first and second cross-seal portions S1 and S2, the portion overlapping the embossed portion 12 in a plan view is referred to as an overlapping portion 12S, and the overlapping portion 12S is not located between the inner end portion Sc and the outer end portion Sd, preferably between the inner end portion Sc and the outer end portion Sd.
The overlapping portion 12S of the first cross seal S1 and the embossed portion 12 is located outside the overlapping portion 12S of the second cross seal S2 and the embossed portion 12 in the lateral direction Y.
The positions of the overlapping portions 12S of the sealing portions S are compared in accordance with the distance in the lateral direction Y from the inner end Sc of the sealing portions S to the overlapping portions 12S. The distance in the lateral direction Y from the inner end portion Sc of each sealing portion S to the overlapping portion 12S means the distance in the lateral direction Y from the inner end portion Sc to the portion of the overlapping portion 12S furthest inward in the lateral direction Y. That is, the distance e2 in the lateral direction Y from the inner end Sc of the second cross seal S2 to the overlap 12S is preferably larger than the distance e1 in the lateral direction Y from the inner end Sc of the first cross seal S1 to the overlap 12S.
The overlapping portion 12S does not overlap the inner end portion Sc and the outer end portion Sd, and thus, when a caregiver or the like lifts up the pants-type absorbent article during the wearing operation, the first cross-seal portion S1 and the second cross-seal portion S2 can be prevented from being peeled off by the contact of the fingers of the caregiver or the like with the inner end portion Sc and the outer end portion Sd. In addition, when the abdominal circumference of the wearer greatly fluctuates during wearing, it is possible to prevent the first and second cross seals S1 and S2 from being peeled off by applying a force in the lateral direction Y to the inner end Sc thereof. Therefore, with this structure, the side joint 8 can be prevented from being peeled off during the wearing operation and during wearing.
Further, the overlapping portion 12S of the second cross seal S2 is located outside the overlapping portion 12S of the first cross seal S1 in the lateral direction Y, whereby the overlapping portion 12S as the weak bond is located further outside the second cross seal S2 in the lateral direction Y. Thus, the first and second cross seals S1 and S2 can be efficiently torn by the tearing force applied to them in the lateral direction Y, and the tearing easiness can be further improved.
[ structural example in the case where the number of layers of the outer body of the side joint portion is different ]
In the present embodiment, as shown in fig. 4, the outer body 5 constituting the side joint portion 8 has a folded-back structure, and the side joint portion 8 has a plurality of regions in which the number of layers of thermoplastic sheets 50 is different.
That is, in the present embodiment, the side joint portion 8 has a first lamination region T1 in which 3 or more thermoplastic sheets 50 are laminated, and a second lamination region T2 in which a smaller number of thermoplastic sheets 50 than the first lamination region T1 are laminated. The first laminated region T1 includes, as the thermoplastic sheet 50, a first skin-side sheet P1 constituting the skin-facing surface. The second laminated region T2 includes, as the thermoplastic sheet 50, a second skin-side sheet P2 constituting the skin-facing surface. In the present embodiment, the first lamination region T1 corresponds to a region where the outer body 5 is folded back, and the skin-side sheet P in the waist region 8c corresponds to the first skin-side sheet P1.
In the example shown in fig. 4, the first laminated region T1 of the abdominal region 5a is composed of 3 layers of the outer layer sheet 51 which is not folded back, the inner layer sheet 52 which is not folded back, and the outer layer sheet 51 which is folded back. The first laminated region T1 of the back side region 5b is also composed of the same 3 layers. Thus, the first laminated region T1 is composed of 6 layers in total. In the first laminated region T1, the first skin-side sheet P1 is constituted by the folded-back outer sheet 51.
In the example shown in fig. 4, the second laminated region T2 of the abdomen-side region 5a is composed of 2 layers of the outer layer sheet 51 which is not folded back and the inner layer sheet 52 which is not folded back. The second laminated region T2 of the back side region 5b is also composed of the same 2 layers. Thus, the second laminated region T2 is composed of a total of 4 layers. In the second lamination region T2, the second skin-side sheet P2 is constituted by the inner sheet 52 which is not folded back.
In the above-described structure, the first lamination region T1 has a larger number of layers of the thermoplastic sheets 50 than the second lamination region T2, and therefore the amount of thermoplastic resin is also larger. Therefore, the amount of the thermally fused resin in the first lamination region T1 is larger than that in the second lamination region T2, and the bonding strength of the sealing portion S is liable to be high.
Therefore, in the present embodiment, the first skin-side sheet P1 and the second skin-side sheet P2 having different structures can adjust the bonding strength in the first lamination region T1 and the second lamination region T2, and thus the improvement of the tearing stability can be achieved.
(arrangement of embossed portions of skin side sheet)
In the present embodiment, the first skin-side sheet P1 and the second skin-side sheet P2 are each preferably made of a spunbond nonwoven fabric including a plurality of embossed portions 12.
In this case, the first skin-side sheet P1 and the second skin-side sheet P2 are preferably formed of spunbonded nonwoven fabrics having different area ratios of the embossed portions 12, that is, different ratios of the total area of the areas occupied by the plurality of embossed portions 12 in the predetermined area relative to the total area of the predetermined area. Specifically, the first skin-side sheet P1 is preferably higher in area ratio than the embossed portion 12 of the second skin-side sheet P2.
The area ratio of the embossed portions 12 in the spun-bonded nonwoven fabric can be measured in a region including a plurality of embossed portions 12 sufficiently, for example, in a region of a square shape of 20mm×20mm of the spun-bonded nonwoven fabric. The area occupied by each embossed portion 12 can be identified as a series of areas where the thermal fusion of the fibers is visible. The area ratio was measured in the developed and elongated state.
As described above, in the embossed portion 12, the bonding strength of the seal portion S can be reduced. Therefore, in the first lamination region T1 having a large number of lamination, by increasing the area ratio of the embossed portion 12, it is possible to suppress an increase in the bonding strength of the sealing portion S in the first lamination region T1. This can reduce the difference in bonding strength between the first lamination region T1 and the second lamination region T2, and can further stabilize the bonding strength at the entire side bonding portion 8. Therefore, the tearing stability of the side joint 8 can be improved.
The area ratio of the embossed portion 12 of the first skin-side sheet P1 is preferably 5% or more, more preferably 7% or more, preferably 20% or less, more preferably 17% or less.
The area ratio of the embossed portion 12 of the second skin-side sheet P2 is preferably 3% or more, more preferably 5% or more, preferably 17% or less, more preferably 15% or less.
(melting Point of skin side sheet)
As another example, the first skin-side sheet P1 preferably has a higher melting point than the second skin-side sheet P2.
The thermoplastic sheet 50 having a higher melting point is less likely to be thermally fused and the bonding strength is likely to be lowered when the sealing process under the same conditions is performed, as compared with the thermoplastic sheet 50 having a lower melting point. Therefore, in the first laminated region T1 having a large number of layers, by increasing the melting point of the first skin-side sheet P1, it is possible to suppress an increase in the bonding strength of the sealing portion S in the first laminated region T1. This can reduce the difference in bonding strength between the first lamination region T1 and the second lamination region T2, and can stabilize the bonding strength in the entire side bonding portion 8. Therefore, the tearing ease of the side joint portion 8 can be improved.
The melting point of the first skin-side sheet P1 is preferably 125 ℃ or higher, more preferably 155 ℃ or higher, preferably 260 ℃ or lower, more preferably 250 ℃ or lower.
The melting point of the second skin-side sheet P2 is preferably 123 ℃ or higher, more preferably 125 ℃ or higher, preferably 180 ℃ or lower, more preferably 170 ℃ or lower.
(gram weight of skin side sheet)
As another example, the grammage of the first skin-side sheet P1 is preferably lower than the grammage of the second skin-side sheet P2.
In the thermoplastic sheet 50 having a high gram weight, the amount of the thermoplastic resin also increases, and the bonding strength in the sealing portion S tends to increase. Therefore, in the first laminated region T1 having a large number of layers, the grammage of the first skin-side sheet P1 is reduced, whereby the bonding strength of the sealing portion S in the first laminated region T1 can be suppressed from being increased. This can reduce the difference in bonding strength between the first lamination region T1 and the second lamination region T2, and can stabilize the bonding strength of the entire side bonding portion 8. Therefore, the tearing stability of the side joint 8 can be improved.
The gram weight of the first skin-side sheet P1 is preferably 10g/m 2 The above is more preferably 12g/m 2 The above is preferably 30g/m 2 Hereinafter, more preferably 25g/m 2 The following is given.
The grammage of the second skin-side sheet P2 is preferably 12g/m 2 The above is more preferably 14g/m 2 The above is preferably 40g/m 2 Hereinafter, more preferably 30g/m 2 The following is given.
< second embodiment >
In the first embodiment described above, the structure in which only the outer sheet 51 is folded back is described as the folded back structure of the outer body 5, but the present invention is not limited thereto.
In the present embodiment, as shown in fig. 8, both the outer sheet 51 and the inner sheet 52 may be folded back.
In the following second to fourth embodiments, the same components as those of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
In the example shown in fig. 8, the outer sheet 51 and the inner sheet 52 are folded back from the waist opening end Wa toward the skin side. The leg-side ends of the outer sheet 51 and the inner sheet 52 in the folded-back region are located at substantially the same position in the longitudinal direction X.
In the waist region 8c, among the plurality of thermoplastic sheets 50 of the outer body 5, the skin-side sheet P constituting the skin-facing surface is a folded-back outer sheet 51, and the adjacent sheet Q adjacent to the skin-side sheet P is a folded-back inner sheet 52.
In this case, as in the first embodiment, the weld strength reducing agent 9 is preferably disposed between the skin-side sheet P and the adjacent sheet Q in the waist region 8 c. In the example shown in fig. 8, the weld strength reducing agent 9 is disposed between the folded-back outer sheet 51 and the folded-back inner sheet 52 adjacent thereto. Accordingly, the welding strength reducing agent 9 is disposed in the vicinity of the joining interface of the side joining portion 8, and the joining strength of the intersecting portion 9s can be effectively reduced.
In addition, from the viewpoint of further improving the tearing easiness, it is preferable that the penetration depth of the weld strength reducing agent 9 in the skin-side sheet P is deeper than the penetration depth of the weld strength reducing agent 9 in the adjacent sheet Q.
In the example shown in fig. 8, the welding strength reducing agent 9 is disposed in the back side region 5b, and as described above, may be disposed in the abdomen side region 5a, or may be disposed in both of the abdomen side region 5a and the back side region 5 b.
In the present embodiment, the side joint portion 8 also has, as in the first embodiment: a first laminated region T1 in which 3 or more thermoplastic sheets 50 including the first skin-side sheet P1 are laminated; and a second lamination region T2 formed by laminating a smaller number of thermoplastic sheets 50 including the second skin-side sheet P2 than the first lamination region T1. In this example, the first lamination region T1 corresponds to a region where the outer body 5 is folded back, and the skin-side sheet P in the waist region 8c corresponds to the first skin-side sheet P1.
In the example shown in fig. 8, the first laminated region T1 of the abdomen-side region 5a is composed of 4 layers of the non-folded outer layer sheet 51, the non-folded inner layer sheet 52, the folded inner layer sheet 52, and the folded outer layer sheet 51. The first laminated region T1 of the back side region 5b is also composed of the same 4 layers. Thus, the first laminated region T1 is composed of 8 layers in total. In the first laminated region T1, the first skin-side sheet P1 is constituted by the folded-back outer sheet 51.
In the example shown in fig. 8, the second laminated region T2 of the abdominal region 5a is composed of 2 layers of an outer layer sheet 51 which is not folded back, and an inner layer sheet 52 which is not folded back. The second laminated region T2 of the back side region 5b is also composed of the same 2 layers. Thus, the second laminated region T2 is composed of a total of 4 layers. In the second lamination region T2, the second skin-side sheet P2 is constituted by the inner sheet 52 which is not folded back.
In the present embodiment, from the viewpoint of further stabilizing the bonding strength of the entire side bonding portion 8, it is preferable that the first skin-side sheet P1 and the second skin-side sheet P2 are each formed as shown below.
For example, it is preferable that the first skin-side sheet P1 and the second skin-side sheet P2 are each made of a spun-bonded nonwoven fabric including a plurality of embossed portions 12, and from the viewpoint of stabilizing the bonding strength of the entire side bonding portion 8, the area ratio of the embossed portions 12 in the first skin-side sheet P1 is preferably larger than the area ratio of the embossed portions 12 in the second skin-side sheet P2.
For example, in the present embodiment, the melting point of the first skin-side sheet P1 is preferably higher than the melting point of the second skin-side sheet P2 from the viewpoint of more stabilizing the bonding strength of the entire side bonding portion 8.
For example, in the present embodiment, the grammage of the first skin-side sheet P1 is preferably lower than the grammage of the second skin-side sheet P2.
In the pants-type absorbent article having the side joint portions 8 according to the present embodiment, in addition to the above-described structure, the welding strength reducing agent 9, the first cross-seal portion S1, and the second cross-seal portion S2 have the same structure as the first embodiment, and thus both prevention of separation during wearing operation and wearing and ease of tearing at disposal can be achieved.
< third embodiment >
The structure of the exterior body 5 having the folded-back structure is not limited to the above-described example. For example, the positions of the folded end 51a as the end of the folded-back region of the outer sheet 51 and the folded end 52a as the end of the folded-back region of the inner sheet 52 may be different in the longitudinal direction X.
In the example shown in fig. 9, the folded-back end portion 52a of the inner sheet 52 is located closer to the waist portion than the folded-back end portion 51a of the outer sheet 51 in the longitudinal direction X.
In the example shown in fig. 9, in the waist region 8c, both the outer sheet 51 and the inner sheet 52 are folded back. In this case, the skin-side sheet P constituting the skin-facing surface is a folded-back outer sheet 51, and the adjacent sheet Q adjacent to the skin-side sheet P is a folded-back inner sheet 52.
In this case, as in the first embodiment, the weld strength reducing agent 9 is preferably disposed between the skin-side sheet P and the adjacent sheet Q in the waist region 8 c. In the example shown in fig. 9, the weld strength reducing agent 9 is disposed between the folded-back outer sheet 51 and the folded-back inner sheet 52 adjacent thereto.
In addition, from the viewpoint of further improving the tearing ease, the penetration depth of the weld strength reducing agent 9 in the skin-side sheet P is preferably deeper than the penetration depth of the weld strength reducing agent 9 in the adjacent sheet Q.
In the example shown in fig. 9, the welding strength reducing agent 9 may be disposed in the abdomen-side region 5a, the back-side region 5b, or both the abdomen-side region 5a and the back-side region 5b as described above.
In addition, in the present embodiment, as in the second embodiment, the side joint portion 8 includes: a first laminated region T1 in which 3 or more thermoplastic sheets 50 including the first skin-side sheet P1 are laminated; and a second lamination area T2 in which a smaller number of thermoplastic sheets 50 including the second skin-side sheet P2 are laminated than the first lamination area T1. In this example, the first lamination region T1 corresponds to a region where the outer body 5 is folded back, and the skin-side sheet P in the waist region 8c corresponds to the first skin-side sheet P1.
In the present embodiment, the first lamination region T1 includes regions in which the number of thermoplastic sheets 50 to be laminated is different. That is, the first lamination region T1 includes: a leg-side lamination region T12 formed by laminating a larger number of thermoplastic sheets 50 adjacent to the second lamination region T2 than the second lamination region T2; and a waist-side laminated region T11 in which a greater number of thermoplastic sheets 50 than the leg-side laminated region T12 are laminated.
In the example shown in fig. 9, the waist region 8c is included in the waist-side lamination region T11.
In the example shown in fig. 9, the waist-side laminated region T11 of the abdomen-side region 5a is composed of 4 layers of an outer layer sheet 51 which is not folded back, an inner layer sheet 52 which is folded back, and an outer layer sheet 51 which is folded back. The waist-side laminated region T11 of the back-side region 5b is also composed of the same 4 layers. Thus, the waist-side laminated region T11 is composed of 8 layers in total.
The leg-side laminated region T12 of the abdomen-side region 5a is composed of 3 layers of the non-folded outer layer sheet 51, the non-folded inner layer sheet 52, and the folded outer layer sheet 51. The leg-side laminated region T12 of the back-side region 5b is also composed of the same 3 layers. Thus, the leg-side laminated region T12 is composed of 6 layers in total.
In addition, the waist-side laminated region T11 and the leg-side laminated region T12 are both configured such that the first skin-side sheet P1 is formed by the folded-back outer sheet 51.
In the example shown in fig. 9, the second laminated region T2 of the abdominal region 5a is composed of 2 layers of an outer layer sheet 51 which is not folded back, and an inner layer sheet 52 which is not folded back. The second laminated region T2 of the back side region 5b is also composed of the same 2 layers. Thus, the second laminated region T2 is composed of a total of 4 layers. In the second lamination region T2, the second skin-side sheet P2 is constituted by the inner sheet 52 which is not folded back.
In the present embodiment, from the viewpoint of stabilizing the bonding strength of the entire side bonding portion 8, it is preferable that the first skin-side sheet P1 and the second skin-side sheet P2 are each formed as described below.
For example, it is preferable that the first skin-side sheet P1 and the second skin-side sheet P2 are each made of a spun-bonded nonwoven fabric including a plurality of embossed portions 12, and from the viewpoint of stabilizing the bonding strength of the entire side bonding portion 8, the area ratio of the embossed portions 12 in the first skin-side sheet P1 is preferably larger than the area ratio of the embossed portions 12 in the second skin-side sheet P2.
For example, in the present embodiment, the melting point of the first skin-side sheet P1 is preferably higher than the melting point of the second skin-side sheet P2 from the viewpoint of stabilizing the bonding strength of the entire side bonding portion 8.
For example, in the present embodiment, the grammage of the first skin-side sheet P1 is preferably lower than the grammage of the second skin-side sheet P2.
In the pants-type absorbent article having the side joint portions 8 according to the present embodiment, in addition to the above-described structure, the welding strength reducing agent 9, the first cross-seal portion S1, and the second cross-seal portion S2 have the same structure as the first embodiment, and thus both prevention of separation during wearing operation and wearing and ease of tearing at disposal can be achieved.
< fourth embodiment >
The pants-type absorbent article of the present invention is not limited to the example in which the outer body 5 has the folded structure as in the above-described embodiments, and the outer body 5 may not have the folded structure.
In the present embodiment, as shown in fig. 10, both the outer layer sheet 51 and the inner layer sheet 52 are not folded back, and the ends of these sheets may coincide with the waist opening end Wa.
That is, in this example, the whole of the outer body 5 is composed of the same number of layers, and for example, the abdomen-side region 5a and the back-side region 5b are composed of 2 layers of the outer layer sheet 51 and the inner layer sheet 52, respectively.
That is, in the waist region 8c of the side joint 8, among the plurality of thermoplastic sheets 50 of the outer body 5, the skin-side sheet P constituting the skin-facing surface is the inner sheet 52, and the adjacent sheet Q adjacent to the skin-side sheet P is the outer sheet 51.
In this case as well, as in the first embodiment, from the viewpoint of effectively reducing the bonding strength of the intersecting portion 9s, it is preferable that the weld strength reducing agent 9 is disposed between the skin-side sheet P and the adjacent sheet Q in the waist region 8 c. In the example shown in fig. 10, the weld strength reducing agent 9 is disposed between the inner sheet 52 and the outer sheet 51 adjacent thereto.
In addition, from the viewpoint of more effectively reducing the bonding strength of the intersecting portion 9s, it is preferable that the penetration depth of the welding strength reducing agent 9 in the skin-side sheet P is deeper than the penetration depth of the welding strength reducing agent 9 in the adjacent sheet Q.
In the example shown in fig. 10, the welding strength reducing agent 9 may be disposed in both the abdominal region 5a and the back region 5b, or may be disposed in one of the abdominal region 5a and the back region 5b as described above.
In the present embodiment, it is preferable that the skin-side sheet P be composed of the same nonwoven fabric in the entire side joint portion 8, from the viewpoint of stabilizing the joint strength of the entire side joint portion 8.
For example, the skin-side sheet P is preferably made of a spunbond nonwoven fabric including a plurality of embossed portions 12, and the distance between the embossed portions 12 is preferably substantially constant throughout the side joint portions 8. The phrase "the distance between the embossed portions 12 is substantially constant" means that, when the shortest distance between 10 or more embossed portions 12 is compared, the maximum distance is converged to 110% or less, assuming that the minimum distance is 100%.
For example, in the present embodiment, the melting point of the skin-side sheet P is preferably substantially constant throughout the side joining portion 8. The phrase "the melting point of the skin-side sheet P is substantially constant throughout the side joint 8" means that, when the melting points of the skin-side sheet P at 10 or more points in the side joint 8 are compared, the highest melting point converges to 110% or less, assuming that the lowest melting point is 100%.
For example, in the present embodiment, the grammage of the skin-side sheet P is preferably substantially constant throughout the side joint portion 8. The phrase "the grammage of the skin-side sheet P is substantially constant throughout the side joint portion 8" means that, when the grammage of the skin-side sheet P at 10 or more points in the side joint portion 8 is compared, the highest grammage converges to 110% or less, assuming that the lowest grammage is 100%.
In the pants-type absorbent article having the side joint portions 8 according to the present embodiment, in addition to the above-described structure, the welding strength reducing agent 9, the first cross-seal portion S1, and the second cross-seal portion S2 have the same structure as the first embodiment, and thus both prevention of separation during wearing operation and wearing and ease of tearing at disposal can be achieved.
< other embodiments >
The embodiments of the present invention have been described above, but the present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above embodiment, the outer body 5 has been described as having the abdomen side region 5a, the back side region 5b, and the crotch region 5c, but is not limited thereto. For example, the outer body 5 may have a structure divided into a abdomen side region and a back side region without the crotch region.
The pants-type absorbent article of the present invention may be a disposable diaper for infants, for example, a disposable diaper for adults or children. The pants-type absorbent article of the present invention may not be a disposable diaper as long as it is a type of absorbent article worn on the lower body. Examples of such pants-type absorbent articles include pants-type sanitary napkins and the like.
With respect to the above-described embodiments, the present invention further discloses the following absorbent articles.
<1> a pants-type absorbent article, comprising: an absorbent body; and an outer body comprising a plurality of thermoplastic sheets and disposed on the non-skin-facing side of the absorbent main body, and having a longitudinal direction extending from the abdomen side to the back side of the wearer through the crotch portion and a transverse direction orthogonal to the longitudinal direction,
the outer package includes:
a ventral region disposed on the ventral side of the wearer;
a back side region disposed on the back side of the wearer; and
a pair of side joint parts formed by respectively jointing side edge parts of the abdomen side area and side edge parts of the back side area in the transverse direction,
the pair of side joint portions have waist end portions and leg end portions constituting both end portions in the longitudinal direction,
At least one of the side joint parts has:
a plurality of sealing parts extending in the lateral direction and arranged at intervals in the longitudinal direction; and
a linearly extending weld strength reducing agent disposed between the thermoplastic sheets,
the plurality of seals each include an inner end portion which is the end portion on the inner side in the lateral direction and an outer end portion which is the end portion on the outer side in the lateral direction, and include a first cross seal portion and a second cross seal portion which are the seal portions arranged in the waist region located within 25mm from the waist end portion in the longitudinal direction and cross the weld strength reducing agent other than the inner end portion and the outer end portion in a plan view,
the first cross sealing portion and the second cross sealing portion are disposed adjacent to each other in this order from the waist end portion side toward the leg end portion side,
when an intersection angle between the welding strength reducing agent and the first cross-seal portion on the waist end side and the lateral inner side is α1, an intersection angle between the welding strength reducing agent and the first cross-seal portion on the leg end side and the lateral outer side is α2, an intersection angle between the welding strength reducing agent and the second cross-seal portion on the waist end side and the lateral inner side is α3, and an intersection angle between the welding strength reducing agent and the second cross-seal portion on the leg end side and the lateral outer side is α4, the side joint portion including the first cross-seal portion and the second cross-seal portion satisfies the following formula (1):
5 degrees < alpha 1< alpha 2< alpha 3< alpha 4<90 degrees … (1).
<2>
The pant-type absorbent article according to <1>, wherein,
the side joint portion including the first cross seal and the second cross seal satisfies the following formula (1)':
5 degrees < α1< α2< α3< α4<90 degrees … (1)'.
<3>
The pant-type absorbent article according to <1> or <2>, wherein,
the plurality of thermoplastic sheets include a skin-side sheet constituting a skin-facing surface of the outer body in the waist region and an adjacent sheet adjacent thereto,
the weld strength reducing agent is disposed between the skin-side sheet and the adjacent sheet.
<4>
The pant-type absorbent article according to <3>, wherein,
the penetration depth of the weld strength reducing agent in the skin side sheet is deeper than the penetration depth of the weld strength reducing agent in the adjacent sheet.
<5>
The pant-type absorbent article according to any of <1> to <4>, wherein,
the first cross sealing portion is disposed at a position closest to the waist end portion among the plurality of sealing portions.
<6>
The pant-type absorbent article according to any of <1> to <5>, wherein,
the ventral region and the dorsal region are divided into:
A waist stretch region in which a plurality of elastic members extending in the lateral direction are arranged, the waist stretch region being located within 25mm of the waist opening end in the longitudinal direction; and
a leg-side extension/contraction region in which a plurality of elastic members extending in the lateral direction are arranged, the leg-side extension/contraction region being located closer to the leg side in the longitudinal direction than the waist extension/contraction region,
the average elongation of the plurality of elastic members in the waist region is lower than the average elongation of the plurality of elastic members in the leg region.
<7>
The pant-type absorbent article according to any of <1> to <6>, wherein,
the plurality of sealing parts include at least 3 n cross sealing parts including the first cross sealing part and the second cross sealing part as the sealing parts crossing the welding strength reducing agent,
when n is an integer of 3 or more, k is an integer of 2 or more and n or less, an intersection angle between a kth one of the intersecting seal portions on the leg end side and the welding strength reducing agent on the waist end side and the lateral inner side is α (2 k-1), and an intersection angle between a kth one of the intersecting seal portions and the welding strength reducing agent on the leg end side and the lateral outer side is α (2 k), the side joint portions including the 3 or more intersecting seal portions satisfy the following formulas (2) and (3):
α(2(k-1)-1)≤α(2(k-1))<α(2k-1)≤α(2k)… (2)
Alpha 1 is less than or equal to 5 degrees and alpha 2 is less than or equal to …, alpha (2 n-1) is less than or equal to alpha (2 n) and is less than or equal to 90 degrees … (3)
<8>
The pant-type absorbent article according to <7>, wherein,
the side joint portion including the 3 or more cross seals satisfies the following formulas (2) 'and (3)':
α(2(k-1)-1)<α(2(k-1))<α(2k-1)<α(2k)… (2)'
5 degrees < alpha 1< alpha 2< … < alpha (2 n-1) < alpha (2 n) < 90 degrees … (3) < alpha (2 n)'
<9>
The pant-type absorbent article according to any of <1> to <8>, wherein,
the sealing parts located in the whole crossing area within 10mm from the end part of the first crossing sealing part on the waist end part side and below the leg end part side are configured as crossing sealing parts crossing the welding strength reducing agent,
in the cross seal portion in the cross region, a distance from the inner end portion to a cross portion with the welding strength reducing agent gradually increases as going toward the leg end portion side, and the cross portion of all the cross seal portions in the cross region does not overlap with the outer end portion in a plan view.
<10>
The pant-type absorbent article according to any of <1> to <9>, wherein,
the width of the crossing portion of the first crossing sealing portion and the weld strength reducing agent in the lateral direction is substantially the same as the width of the crossing portion of the second crossing sealing portion and the weld strength reducing agent in the lateral direction.
<11>
The pant-type absorbent article according to any of <1> to <10>, wherein,
the weld strength reducing agent is formed of at least a part of a spiral or corrugated curve.
<12>
The pant-type absorbent article according to any of <1> to <11>, wherein,
the pair of side joint portions each have:
a plurality of sealing parts extending in the lateral direction and arranged at intervals in the longitudinal direction; and
a linearly extending weld strength reducing agent disposed between the thermoplastic sheets,
the plurality of sealed portions of each of the pair of side joint portions include an inner end portion which is the end portion on the inner side in the lateral direction and an outer end portion which is the end portion on the outer side in the lateral direction, and include a first cross sealed portion and a second cross sealed portion which are sealed portions arranged in a waist region located within 25mm from the waist end portion, and which cross the weld strength reducing agent other than the inner end portion and the outer end portion in a plan view,
the first cross seal and the second cross seal of each of the pair of side joint portions are disposed adjacent to each other in this order from the waist end portion side toward the leg end portion side,
When an intersection angle between the welding strength reducing agent and the first cross-seal portion on the waist end side and the lateral inner side is α1, an intersection angle between the welding strength reducing agent and the first cross-seal portion on the leg end side and the lateral outer side is α2, an intersection angle between the welding strength reducing agent and the second cross-seal portion on the waist end side and the lateral inner side is α3, and an intersection angle between the welding strength reducing agent and the second cross-seal portion on the leg end side and the lateral outer side is α2, the pair of side joints satisfy the formula (1), respectively.
<13>
The pant-type absorbent article according to any of <1> to <12>, wherein,
in the waist region, a skin-facing surface of the outer body is formed of a spun-bonded nonwoven fabric including a plurality of embossed portions,
the first cross seal and the second cross seal overlap at least 1 of the embossed portions except the inner end portion and the outer end portion in a plan view,
and an overlapping portion between the first cross seal and the embossed portion, the overlapping portion being located on the outer side in the lateral direction than an overlapping portion between the second cross seal and the embossed portion.
<14>
The pant-type absorbent article according to any of <1> to <13>, wherein,
the side joint portion includes:
a first laminated region including 3 or more thermoplastic sheets including a first skin-side sheet constituting a skin-facing surface; and
a second laminated region formed by laminating a smaller number of the thermoplastic sheets than the first laminated region including a second skin-side sheet constituting a skin-facing surface,
the first skin-side sheet and the second skin-side sheet are each composed of a spun-bonded nonwoven fabric including a plurality of embossed portions,
the area ratio of the embossed portion in the first skin-side sheet is higher than the area ratio of the embossed portion in the second skin-side sheet.
<15>
The pant-type absorbent article according to any of <1> to <14>, wherein,
the side joint portion includes:
a first laminated region including 3 or more thermoplastic sheets including a first skin-side sheet constituting a skin-facing surface; and
a second laminated region formed by laminating a smaller number of the thermoplastic sheets than the first laminated region including a second skin-side sheet constituting a skin-facing surface,
the first skin-side sheet has a higher melting point than the second skin-side sheet.
<16>
The pant-type absorbent article according to any of <1> to <15>, wherein,
the side joint portion includes:
a first laminated region including 3 or more thermoplastic sheets including a first skin-side sheet constituting a skin-facing surface; and
a second laminated region formed by laminating a smaller number of the thermoplastic sheets than the first laminated region including a second skin-side sheet constituting a skin-facing surface,
the first skin side sheet has a lower gram weight than the second skin side sheet.
Description of the reference numerals
1 … pants-type absorbent article (Disposable diaper, diaper)
4 … absorbent body
5 … outer package
5a … ventral region
5b … backside region
50 … thermoplastic sheet
8 … side joint
8a … waist end
8b … leg end
9 … weld strength reducing agent
S … sealing part
S1 … first Cross seal
S2 … second Cross seal
Inner end of Sc …
Sd … outer end
Industrial applicability
According to the pants-type absorbent article of the present invention, both prevention of separation during wearing operation and wearing and easy tearing during disposal can be achieved.
Claims (16)
1. A pants-type absorbent article comprising: an absorbent body; and an outer body comprising a plurality of thermoplastic sheets and disposed on a non-skin-facing side of the absorbent main body, and having a longitudinal direction extending from a wearer's abdomen side to a back side through a crotch portion, and a transverse direction orthogonal to the longitudinal direction, wherein the pants-type absorbent article is characterized in that:
The outer package has:
a ventral region disposed on the ventral side of the wearer;
a back side region disposed on the back side of the wearer; and
a pair of side joint parts formed by respectively jointing side edge parts of the abdomen side area and side edge parts of the back side area in the transverse direction,
the pair of side joint portions have a waist end portion and a leg end portion constituting both end portions in the longitudinal direction,
at least one of the side joints has:
a plurality of sealing parts extending in the lateral direction and arranged at intervals in the longitudinal direction; and
a linearly extending weld strength reducing agent disposed between the thermoplastic sheets,
the plurality of seals respectively include an inner end portion which is an end portion of the lateral inner side and an outer end portion which is an end portion of the lateral outer side, and include a first cross seal portion and a second cross seal portion which are the seal portions arranged in a waist region located within 25mm from the waist end portion in the longitudinal direction and cross the weld strength reducing agent beyond the inner end portion and the outer end portion in a plan view,
The first cross seal and the second cross seal are disposed adjacent to each other in this order from the waist end side toward the leg end side,
when an intersection angle between the welding strength reducing agent and the first cross-seal portion on the waist end side and the lateral inner side is α1, an intersection angle between the welding strength reducing agent and the first cross-seal portion on the leg end side and the lateral outer side is α2, an intersection angle between the welding strength reducing agent and the second cross-seal portion on the waist end side and the lateral inner side is α3, and an intersection angle between the welding strength reducing agent and the second cross-seal portion on the leg end side and the lateral outer side is α4, the side joint portion including the first cross-seal portion and the second cross-seal portion satisfies the following formula (1):
5 degrees < alpha 1< alpha 2< alpha 3< alpha 4<90 degrees … (1).
2. The pant-type absorbent article of claim 1, wherein:
the side joint portion including the first and second cross seals satisfies the following formula (1)':
5 degrees < α1< α2< α3< α4<90 degrees … (1)'.
3. The pant-type absorbent article of claim 1 or 2, wherein:
the plurality of thermoplastic sheets include a skin-side sheet constituting a skin-facing surface of the outer body in the waist region, and an adjacent sheet adjacent thereto,
the weld strength reducing agent is disposed between the skin-side sheet and the adjacent sheet.
4. A pant-type absorbent article according to claim 3, wherein:
the penetration depth of the weld strength reducing agent in the skin side sheet is deeper than the penetration depth of the weld strength reducing agent in the adjacent sheet.
5. The pant-type absorbent article according to any of claims 1 to 4, wherein:
the first cross seal is disposed at a position closest to the waist end among the plurality of seals.
6. The pant-type absorbent article according to any of claims 1 to 5, wherein:
the ventral region and the dorsal region are divided into:
a waist stretch region in which a plurality of elastic members extending in the lateral direction are arranged, the waist stretch region being located within 25mm from the waist opening end in the longitudinal direction; and
a leg-side stretchable region in which a plurality of elastic members extending in the lateral direction are arranged and which is located closer to the leg side in the longitudinal direction than the waist stretchable region,
The average elongation of the plurality of elastic members in the waist region extension and contraction region is lower than the average elongation of the plurality of elastic members in the leg region extension and contraction region.
7. The pant-type absorbent article according to any of claims 1 to 6, wherein:
the plurality of sealing parts include at least 3 n cross sealing parts including the first cross sealing part and the second cross sealing part as the sealing parts crossing the welding strength reducing agent,
when n is an integer of 3 or more, k is an integer of 2 or more and n or less, an intersecting angle α (2 k-1) between a kth one of the intersecting seal portions on the leg end side and the welding strength reducing agent on the waist end side and the lateral inner side from the first intersecting seal portion, and an intersecting angle α (2 k) between a kth one of the intersecting seal portions and the welding strength reducing agent on the leg end side and the lateral outer side is the intersecting angle α (2 k), the side joint portions including the 3 or more intersecting seal portions satisfy the following formulas (2) and (3):
α(2(k-1)-1)≤α(2(k-1))<α(2k-1)≤α(2k)…(2)
the angle alpha 1 is less than or equal to 5 degrees and less than or equal to alpha 2 is less than or equal to …, the angle alpha (2 n-1) is less than or equal to alpha (2 n) and less than or equal to 90 degrees … (3).
8. The pant-type absorbent article of claim 7, wherein:
The side joint portion including the 3 or more cross seals satisfies the following formulas (2) 'and (3)':
α(2(k-1)-1)<α(2(k-1))<α(2k-1)<α(2k)…(2)'
5 degrees < alpha 1< alpha 2< … < alpha (2 n-1) < alpha (2 n) < 90 degrees … (3)'.
9. The pant-type absorbent article according to any of claims 1 to 8, wherein:
all of the sealing portions located in the crossing region within 10mm from the waist end side end of the first crossing sealing portion on the leg end side are configured as crossing sealing portions crossing the weld strength reducing agent,
in the cross seal in the cross region, a distance from the inner end portion to a cross portion with the welding strength reducing agent gradually increases as going toward the leg end portion side, and the cross portion of all the cross seal in the cross region does not overlap with the outer end portion in a plan view.
10. The pant-type absorbent article according to any of claims 1 to 9, wherein:
a width in the lateral direction of an intersection of the first intersecting seal portion and the weld strength reducing agent is substantially the same as a width in the lateral direction of an intersection of the second intersecting seal portion and the weld strength reducing agent.
11. The pant-type absorbent article according to any of claims 1 to 10, wherein:
the weld strength reducing agent is formed of at least a part of a spiral or corrugated curve.
12. The pant-type absorbent article according to any of claims 1 to 11, wherein:
the pair of side joint portions each have:
a plurality of sealing parts extending in the lateral direction and arranged at intervals in the longitudinal direction; and
a linearly extending weld strength reducing agent disposed between the thermoplastic sheets,
the plurality of sealed portions of each of the pair of side joint portions includes an inner end portion which is an end portion of the lateral inner side and an outer end portion which is an end portion of the lateral outer side, and includes a first cross sealed portion and a second cross sealed portion which are sealed portions arranged in a waist region located within 25mm from the waist end portion, and cross the weld strength reducing agent outside the inner end portion and the outer end portion in a plan view,
the first and second cross seals of each of the pair of side joint portions are disposed adjacent to each other in this order from the waist end portion side toward the leg end portion side,
When an intersection angle between the welding strength reducing agent and the first cross seal portion on the waist end portion side and the lateral inner side is α1, an intersection angle between the welding strength reducing agent and the first cross seal portion on the leg end portion side and the lateral outer side is α2, an intersection angle between the welding strength reducing agent and the second cross seal portion on the waist end portion side and the lateral inner side is α3, and an intersection angle between the welding strength reducing agent and the second cross seal portion on the leg end portion side and the lateral outer side is α2, the pair of side joining portions satisfy the formula (1), respectively.
13. The pant-type absorbent article according to any of claims 1 to 12, wherein:
in the waist region, a skin-facing surface of the outer body is constituted of a spun-bonded nonwoven fabric including a plurality of embossed portions,
the first and second cross seals overlap at least 1 of the embossed portions except the inner and outer end portions, respectively, in plan view,
the overlapping portion of the first cross seal and the embossed portion is located further to the outside in the lateral direction than the overlapping portion of the second cross seal and the embossed portion.
14. The pant-type absorbent article according to any of claims 1 to 13, wherein:
the side joint has:
a first laminated region in which 3 or more thermoplastic sheets including a first skin-side sheet constituting a skin-facing surface are laminated; and
a second laminated region formed by laminating a smaller number of thermoplastic sheets than the first laminated region, including a second skin-side sheet constituting a skin-facing surface,
the first skin-side sheet and the second skin-side sheet are each composed of a spun-bonded nonwoven fabric comprising a plurality of embossed portions,
the embossed portion in the first skin-side sheet has a higher area ratio than the embossed portion in the second skin-side sheet.
15. The pant-type absorbent article according to any of claims 1 to 14, wherein:
the side joint has:
a first laminated region in which 3 or more thermoplastic sheets including a first skin-side sheet constituting a skin-facing surface are laminated; and
a second laminated region formed by laminating a smaller number of thermoplastic sheets than the first laminated region, including a second skin-side sheet constituting a skin-facing surface,
The first skin side sheet has a higher melting point than the second skin side sheet.
16. The pant-type absorbent article according to any of claims 1 to 15, wherein:
the side joint has:
a first laminated region in which 3 or more thermoplastic sheets including a first skin-side sheet constituting a skin-facing surface are laminated; and
a second laminated region formed by laminating a smaller number of thermoplastic sheets than the first laminated region, including a second skin-side sheet constituting a skin-facing surface,
the first skin side sheet has a lower grammage than the second skin side sheet.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021-133754 | 2021-08-19 | ||
| JP2022123677A JP7350946B2 (en) | 2021-08-19 | 2022-08-03 | Pants-type absorbent article |
| JP2022-123677 | 2022-08-03 | ||
| PCT/JP2022/029900 WO2023022000A1 (en) | 2021-08-19 | 2022-08-04 | Underwear-type absorbent article |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117425462A true CN117425462A (en) | 2024-01-19 |
Family
ID=89530699
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202280039948.0A Pending CN117425462A (en) | 2021-08-19 | 2022-08-04 | Pants-type absorbent article |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117425462A (en) |
-
2022
- 2022-08-04 CN CN202280039948.0A patent/CN117425462A/en active Pending
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