CN111971013B

CN111971013B - Pants-type disposable diaper

Info

Publication number: CN111971013B
Application number: CN201980025758.1A
Authority: CN
Inventors: 植田章之
Original assignee: Kao Corp
Current assignee: Kao Corp
Priority date: 2018-04-24
Filing date: 2019-04-05
Publication date: 2022-02-08
Anticipated expiration: 2039-04-05
Also published as: CN111971013A; JP7106211B2; WO2019208179A1; JP2019187716A; RU2747615C1

Abstract

A disposal tape (10) is provided on the outer surface of the diaper (1). In the waste tape (10), a fixed part (12), an intermediate part (15), and a fastening part (18) are arranged in this order along the longitudinal direction (X1) of the waste tape (10), and the waste tape is formed in a three-fold state by stacking in this order. The fixed section (18) and the intermediate section (15) are releasably joined to each other, and the intermediate section (15) and the fixed section (12) are releasably joined to each other. The fixed portion (18) and the intermediate portion (15) are capable of extending in the longitudinal direction (X1) of the disposal tape (10) in an unfolded state in which the three-fold state is released. The tensile strength at which the fixed portion (18) starts to elongate is higher than the tensile strength at which the intermediate portion (15) starts to elongate.

Description

Pants-type disposable diaper

Technical Field

The present invention relates to a pants-type disposable diaper having a disposal tape.

Background

From the viewpoint of easily and hygienically disposing of a disposable diaper, a diaper including a disposal tape capable of maintaining the disposable diaper in a lump is known. As the disposal tape, a diaper having an extensible portion has been proposed from the viewpoint of handling property for uniting the diaper and maintaining the diaper in a united state. For example, the present applicant has previously proposed a fastening tape having an extensible stretch portion provided in connection with a base portion (patent document 1).

Further, patent document 2 describes a laminated disposable tape ear comprising a plastically deformable extensible film having a 1 st tape ear part and a 2 nd tape ear part which are adjacent to each other, and an intermediate portion between both end portions, one end portion of the film being bonded to the 1 st surface of the 1 st tape ear part, and the other end portion of the film being bonded to the 1 st surface of the 2 nd tape ear part.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 9-99010

Patent document 2: european patent application publication No. 1762207

Disclosure of Invention

The present invention provides a pants-type disposable diaper having a waist opening and a pair of leg openings, and including a stomach-side portion disposed on the stomach side of a wearer in a worn state, a crotch portion disposed in a crotch portion, and a back-side portion disposed on the back side. A disposal tape is provided on the outer surface of the disposable diaper. The disposal tape is formed in a three-folded state in which a fixing portion, an intermediate portion, and a fastening portion fixed to an outer surface of the disposable diaper are arranged in this order in a longitudinal direction of the disposal tape, and the fixing portion, the intermediate portion, and the fastening portion are laminated in this order. In the waste tape in a three-folded state, the fixed portion and the intermediate portion are releasably joined to each other, and the intermediate portion and the fixed portion are releasably joined to each other. The fastening portion and the intermediate portion are extensible in the longitudinal direction of the disposal tape in an unfolded state in which the triple-folded state is released. The tensile strength at which the fixed joint portion starts to elongate is higher than the tensile strength at which the intermediate portion starts to elongate.

Drawings

Fig. 1 is a perspective view showing an embodiment of a pants-type disposable diaper of the present invention.

Fig. 2 is an expanded plan view schematically showing the skin-facing surface side of the pants-type disposable diaper shown in fig. 1 in an expanded and stretched state.

Fig. 3 is a perspective view showing a disposal form of the pants-type disposable diaper shown in fig. 1.

Fig. 4 is a cross-sectional view showing the structure of a disposal tape provided on the pants-type disposable diaper shown in fig. 1.

Fig. 5(a) and (b) are perspective views showing a state in which the disposal tape of the pants-type disposable diaper shown in fig. 1 is stretched.

Fig. 6 is a partial plan view showing an example of the arrangement of the disposal tape of the present invention.

Detailed Description

According to patent document 1, the length of the waste tape increases due to the elongation thereof, and therefore, the diaper is easily lumped, and the diaper is easily maintained in a lumped state. According to patent document 2, one end of the adhesive tape tab can be held and the tab extended, and as a result, the tab is sufficiently extended to wrap around the product.

However, if the disposal tape having an extensible portion is excessively extended, it may break. Further, there is a case where an operator who uses the disposal tape to form a diaper into a lump and discard the diaper, holds the disposal tape with an uncomfortable feeling that the disposal tape breaks, and uses the disposal tape without sufficiently stretching the disposal tape.

Patent documents 1 and 2 do not disclose a technique for preventing excessive elongation of the waste tape.

The present invention relates to a pants-type disposable diaper which can eliminate the above-described drawbacks of the prior art.

The present invention will be described below based on preferred embodiments of the present invention with reference to the drawings. Fig. 1 shows an embodiment of a pants-type disposable diaper of the present invention. A pants-type disposable diaper 1 (hereinafter, also simply referred to as "diaper 1") shown in the figure is one type of wearing article that is worn and used on the lower abdomen of a wearer.

As shown in fig. 1, the diaper 1 is a pants-type disposable diaper having a waist opening 1W through which a waist of a wearer passes and a pair of

leg openings

1L, 1L through which lower limbs of the wearer pass.

The diaper 1 comprises: an absorbent main body 4 having a front sheet, a back sheet, and an absorber 40; and an outer casing 5 disposed on the non-skin-facing surface side of the absorbent main body 4. The outer package 5 forms a non-skin-facing surface of the diaper 1, i.e., an outer surface of the diaper 1.

In the present specification, the "skin-facing surface" is a surface facing the skin side of the wearer when worn, i.e., a surface relatively close to the skin of the wearer, of the diaper 1 or a component thereof (e.g., the topsheet 2) as an absorbent article, and the "non-skin-facing surface" is a surface facing the opposite side (dressing side) to the skin side when worn, i.e., a surface relatively far from the skin of the wearer, of the diaper 1 or a component thereof. The term "worn" as used herein means a state in which the diaper 1 is maintained in a normal and proper wearing position, i.e., in a proper wearing position.

The diaper 1 includes a stomach-side portion a disposed on the stomach side of the wearer in a worn state, a crotch portion C disposed in the crotch portion, and a back-side portion B disposed on the back side of the wearer. In the diaper 1, both side edges of the outer package 5 in the longitudinal direction X of each of the front and back side portions a, B are joined to each other by a known joining means such as an adhesive, heat sealing, or ultrasonic sealing. Thereby, the waist opening 1W and the pair of

leg openings

1L and 1L are formed.

Fig. 2 shows the diaper 1 in an unfolded and extended state. The "developed and stretched state" of the diaper 1 means a state in which both side edge portions of the exterior body 5 in the longitudinal direction X of each of the front side portion a and the back side portion B are torn from a joined state and brought into a developed state, and the elastic members of the respective portions are stretched to expand the diaper 1 in the developed state to a design size (the same size as when the diaper 1 is expanded to a flat shape in a state in which the influence of the elastic members is completely eliminated).

The diaper 1 has a longitudinal direction X corresponding to a direction extending from the stomach-side portion a to the back-side portion B via the crotch portion C, and a lateral direction Y perpendicular to the longitudinal direction X in a state where the diaper 1 is spread in a flat shape as shown in fig. 2. The longitudinal direction X coincides with the longitudinal direction of the absorbent main body 4. The diaper 1 is formed to be bilaterally symmetric with respect to a longitudinal centerline CL extending in the longitudinal direction X and bisecting the diaper 1 in the transverse direction Y, as shown in fig. 2.

The absorbent main body 4 of the diaper 1 has a front sheet 2 on the skin-facing surface side, a back sheet 3 on the non-skin-facing surface side, and an absorber 40 between the two sheets 2 and 3. In the absorber 40, the front sheet 2, the back sheet 3, and the absorber 40 are located at least over the entire crotch portion C, and extend from the crotch portion C in the longitudinal direction X to at least a part of the stomach-side portion a and the back-side portion B. In the diaper 1, the absorber 40 includes the liquid retentive absorbent core 41 and the core sheet 42 covering the absorbent core 41, but the absorber 40 may not include the core sheet.

As shown in FIG. 2, the diaper 1 has

leakage preventing cuffs

6, 6 extending in the longitudinal direction X on both side portions of the absorbent main body 4 in the longitudinal direction X. The leakage-

proof flanges

6, 6 contain: a cuff forming sheet 61 having water repellency continuously over the entire length of the absorbent main body 4 in the longitudinal direction X; and 1 or more cuff elastic members 62 fixed to the inside of the cuff forming sheet 61 in the transverse direction Y in an extended state in the longitudinal direction X. The

leakage preventing cuffs

6 and 6 are fixed to the front sheet by cuff fixing portions (not shown) extending in the longitudinal direction X. The

leakage preventing cuffs

6, 6 are provided with cuff elastic members 62 so as to rise toward the skin-facing surface side.

As materials for the outer casing 5, the front sheet 2, the back sheet 3, the absorber 40 included in the absorbent body 4, and the constituent members such as the leakage preventing cuffs 6, the same materials as those conventionally used in the art can be used without particular limitation.

As shown in fig. 1, a disposal tape 10 is provided on the back side portion B of the diaper 1. The disposal tape 10 is a member for maintaining the disposal form of the diaper 1. The disposal tape 10 is located at a substantially central portion in the lateral direction Y in the back side portion B of the diaper 1. The disposal tape 10 is disposed so that the longitudinal direction thereof coincides with the longitudinal direction X of the diaper 1.

Fig. 3 shows the disposal form of the diaper 1 when it is discarded. When the diaper 1 is discarded, the diaper 1 is rolled up from the crotch portion C toward the waist opening portion 1W so that the abdomen portion a of the diaper 1 shown in fig. 1 faces inward, thereby forming a rolled-up state shown in fig. 3. In the rolled diaper 1, the disposal tape 10 provided on the back side portion B is exposed to the outside of the rolled diaper 1. As described later, the disposal tape 10 is stretched in the longitudinal direction of the tape 10, and then wound around the outer periphery of the diaper 1 which is wound up to be in a disposal form, thereby maintaining the diaper 1 in the disposal form.

Fig. 4 shows a cross-sectional structure of the waste tape 10 in a three-folded state. The waste tape 10 is mainly composed of 3 portions. Specifically, the disposal tape 10 includes a fixed portion 12, an intermediate portion 15, and a fastening portion 18. These 3 portions are arranged in this order along the longitudinal direction X1 of the waste tape 10. These 3 portions are laminated in this order to form a three-fold state. No other member is present between the fixed portion 12 and the intermediate portion 15, and both are provided in direct contact with each other. Similarly, no other member is present between the intermediate portion 15 and the fixed portion 18, and both are directly connected to each other.

The fixing portion 12 of the disposal tape 10 has a fixing portion sheet 13. The fixing portion sheet 13 has a 1 st surface 13a and a 2 nd surface 13 b. In the disposal tape 10 in the three-folded state, the fixing portion sheet 13 has a 1 st surface 13a facing the intermediate portion 15 and a 2 nd surface 13b facing the outer surface of the diaper 1, except for a folded portion 13' described later. The fixing portion 12 has a fixing portion adhesive portion 14. The fixing portion adhesive portion 14 is provided on the 2 nd surface 13b of the fixing portion sheet 13. The fastening portion 12 is fastened to the outer surface of the back side portion B of the diaper 1 by a fastening portion adhesive portion 14. The disposal tape 10 is fixed to the outer surface of the back side portion B of the diaper 1 via the fixing portion adhesive portion 14 so as not to be attachable and detachable. As a method for fixing the waste tape 10 to the outer surface of the diaper 1, a known method such as an adhesive such as a hot-melt adhesive or welding can be used.

The intermediate portion 15 of the waste tape 10 is a portion that is easily elongated by a weak tensile force when the tensile force is applied to the waste tape 10, and increases the length of the waste tape 10. The intermediate portion 15 has an intermediate portion piece 16. The intermediate portion sheet 16 may be the same length as the fixing portion sheet 13 described above, or may be a different length. The intermediate portion sheet 16 may have the same width as the fixing portion sheet 13 or a different width. The intermediate sheet 16 has a 1 st surface 16a and a 2 nd surface 16 b. In the disposal tape 10 in the three-folded state, the intermediate portion sheet 16 has a 1 st surface 16a facing the fixed portion 18 and a 2 nd surface 16b facing the fixed portion 12, except for a folded portion 16' described later. The intermediate portion 15 has an intermediate portion adhesive portion 17. The intermediate portion adhesive portion 17 is provided on the 2 nd surface 16b of the intermediate portion sheet 16. The intermediate portion adhesive portion 17 is a member for joining the intermediate portion 15 of the triple-folded disposal tape 10 and the fixing portion 12 in a releasable manner. Thus, the intermediate portion adhesive portion 17 is preferably made of a low-adhesion adhesive.

In the fastening portion 12 described above, the fastening portion sheet 13 has a folded portion 13' in which one end of the disposal tape 10 in the longitudinal direction X1 is folded back toward the intermediate portion 15. The folded portion 13' is joined to one end of the intermediate portion sheet 16 of the intermediate portion 15 on the 2 nd surface 16b side. Thus, the fixed portion 12 is provided directly in connection with the intermediate portion 15. As a method of continuously providing (continuously providing) the fixed portion 12 and the intermediate portion 15, a known method such as an adhesive such as a hot-melt adhesive or welding can be used.

The fastening portion 18 of the disposal tape 10 is a portion which can be fastened to any position on the outer surface of the diaper 1 and which is fastened to the outer surface of the diaper 1 when the disposal form of the diaper 1 is maintained by the disposal tape 10. The fastening portion 18 forms a tip end region of the disposal tape 10 and has a fastening portion sheet 19. The fixing section sheet 19 may have the same length as the fixing section sheet 13 or the intermediate section sheet 16, or may have a different length. The fixing portion sheet 19 may have the same width as the fixing portion sheet 13 or the intermediate portion sheet 16, or may have a different width. The fixing portion sheet 19 has a 1 st surface 19a and a 2 nd surface 19 b. In the disposal tape 10 in the three-folded state, the 2 nd surface 19b of the sheet 19 for a fastening portion faces the intermediate portion 15. The fastening portion 18 includes a fastening portion adhesive portion 20. The fastening portion adhesive portion 20 is provided on the 2 nd surface 19b of the fastening portion sheet 19. The fastening portion adhesive portion 20 is a member that releasably joins the fastening portion 18 of the three-folded disposal tape 10 to the intermediate portion 15, and that reliably fastens the fastening portion 18 to an arbitrary position on the outer surface of the diaper 1. From this viewpoint, the degree of adhesiveness of the adhesive section 20 for a fastening section is preferably determined.

The intermediate portion sheet 16 of the intermediate portion 15 described above is folded back at one end in the longitudinal direction X1 toward the fastening portion 18 to form a folded-back portion 16'. The folded-back portion 16' is joined to one end of the fastening portion sheet 19 of the fastening portion 18 on the 2 nd surface 19b side. Thereby, the intermediate portion 15 and the fixed portion 18 can be provided directly in series. As a method of providing the intermediate portion 15 and the fastening portion 18 continuously, a known method such as an adhesive such as a hot-melt adhesive or welding can be used.

Further, at the other end of the fixing section sheet 19 of the fixing section 18, a grip sheet 21 is joined to the 2 nd surface 19b side. The tab piece 21 is a piece separate from the fixing portion piece 19.

The disposal tape 10 composed of 3 portions as described above is folded into three (three-folded) folds in a zigzag shape. The disposal tape 10 is attached to the back side portion B of the diaper 1 so that the free end of the disposal tape 10 in the three-folded state, that is, the attachment portion of the grip piece 21 in the fastening portion 18, faces the waist opening portion 1W side of the diaper 1.

The fastening portion 18 and the intermediate portion 15 can be extended in the longitudinal direction X1 of the disposal tape 10 in the unfolded state where the three-folded state is released. Here, the unfolded state in which the three-folded state is released refers to a state in which the intermediate portion 15 of the waste tape 10 is peeled off from the fixed portion 12 and the intermediate portion 15 is peeled off from the fixed portion 18, and the waste tape 10 in the three-folded state is linearly unfolded. In the unfolded state, the disposal tape 10 can be pulled by the force of a person, and at this time, the fixed portion 18 and the intermediate portion 15 can be extended.

In the disposal tape 10, the tensile strength Pb at which the intermediate portion 15 starts to elongate is lower than the tensile strength Pc at which the fixed portion 18 starts to elongate. That is, the anchor portion 18 can be held by a finger or the like and stretched in the longitudinal direction X1 of the disposal tape 10 to elongate the anchor portion 18 and the intermediate portion 15, respectively, and in this stretching process, the intermediate portion 15 starts to elongate earlier than the anchor portion 18 (see fig. 5 (a)), and after the intermediate portion 15 has been elongate to a certain extent or more, the anchor portion 18 starts to elongate (see fig. 5 (b)). Therefore, for example, it is possible to inform in advance as information that the fastening portion 18 should not be further extended when the extension is started, and it is possible to prevent the intermediate portion 15 from being excessively extended by an operator who rolls the diaper 1 in a disposal form, such as a guardian or a caregiver of an infant, and to prevent the intermediate portion from being broken or the like. This allows the operator to sufficiently pull the waste tape 10 without excessively extending the intermediate portion 15. By using the disposal tape in a sufficiently extended state, the disposal tape can be easily wound around a rolled diaper, and the operability of rolling the diaper 1 into a disposal form is excellent.

The "information" in "informing in advance that the object should not be further stretched as the information" is, for example, an explanatory text "do not further stretch when the pinched portion starts stretching". The information may be an explanatory text, a symbol, a combination thereof, or the like. The information is displayed, for example, in the constituent parts of the diaper or in the packaging of the diaper, in diaper-related advertisements, or in web pages.

The tensile strength is a value determined independently of the width of the waste tape 10. The tensile strengths Pb and Pc at which the respective portions of the intermediate portion and the fixed portion start to elongate were measured by the following methods.

[ method of measuring tensile Strength at the beginning of elongation ]

The intermediate portion of the disposal tape in the three-folded state is peeled from the fixing portion, and the disposal tape is brought into an unfolded state in which the three-folded state is released. Next, the longitudinal direction of the waste tape was aligned with the drawing direction, the distance between chucks was set to 10mm, and each part such as the intermediate part was mounted on a chuck of a drawing tester (for example, model "AUTOGRAPH AG-X" manufactured by shimadzu corporation). The respective portions are attached to the chuck while avoiding joints with other adjacent portions. For example, when the intermediate portion is attached, a portion between a joint with the fixed portion and a joint with the fixed portion is attached to the chuck while avoiding the joint. Next, the sheet was stretched at a speed of 300mm/min, and the tensile strength was measured while varying with the stretching distance. The tensile strength (N) at which the elongation of each portion is started is the strength of the measured first maximum point. In the measured curve of tensile strength (N), the first maximum point is the first maximum point to occur. When the first local maximum point cannot be clearly determined or observed, the maximum strength at the time of elongation between 30% and 70% of the elongation is regarded as the strength of the first local maximum point. The maximum value of the tensile strength that varies with the tensile distance is defined as the breaking strength, the time point at which the breaking strength is indicated is defined as "at breaking" of each of the portions, and the elongation at breaking is defined as "100% elongation".

The tensile strength Pc at which the rigid joint portion 18 starts to elongate is preferably lower than the breaking strength Pe of the intermediate portion 15. By adopting this configuration, the fastening portion 18 starts to elongate in the process of pulling the waste adhesive tape 10, whereby the operator can recognize that the elongation of the intermediate portion 15 has approached the limit. That is, the operator can stretch the waste tape 10 to such an extent that the breakage of the intermediate portion 15 is not caused.

The breaking strength (N) at each part such as the intermediate part in the waste tape is the maximum value of the tensile strength which changes with the tensile distance in the [ method for measuring tensile strength at the start of elongation ].

From the viewpoint of more reliably achieving the above-described effects, the ratio (Pe/Pc) of the breaking strength Pe of the intermediate portion 15 to the tensile strength Pc at which the fixed connection portion 18 starts to elongate is preferably 2 or more, more preferably 3 or more, further preferably 6 or less, more preferably 5 or less, further preferably 2 or more and 6 or less, and more preferably 3 or more and 4 or less.

From the same viewpoint as described above, the fastening portion 18 preferably visually changes before and after the extension. With this configuration, the operator can easily adjust the force for pulling the waste tape so that the intermediate portion 15 during extension does not break by making the fastening portion 18 visually changeable while the fastening portion 18 is extending.

The visual change of the fastening portion 18 may be a change in the color of the fastening portion 18, a change in the shape of a figure or a symbol provided to the fastening portion 18, or a combination thereof. Specifically, the fixed portion 18 may be changed from a dark color to a light color or from a light color to a dark color before and after elongation, or the figures and symbols may be enlarged before and after elongation. For example, the area ratio of the colored portion to the non-colored portion of the fastening portion 18 changes due to the fastening portion 18 being pulled, and the color changes. Further, the pattern or the like provided to the fastening portion 18 may be stretched in association with the stretching of the fastening portion 18, and the pattern or the like may be deformed.

From the viewpoint of facilitating the elongation of the disposal tape 10 and preventing accidental elongation, the tensile strength Pb at which the intermediate portion 15 starts to elongate is preferably 1.0N or more, more preferably 3.0N or more, further preferably 6.5N or less, more preferably 5N or less, further preferably 1.0N or more and 6.5N or less, and more preferably 3.0N or more and 5N or less.

From the viewpoint of facilitating the elongation of the intermediate portion 15 earlier than the fixed joint portion 18, the tensile strength Pc at which the fixed joint portion 18 starts to elongate is preferably 10N or more, more preferably 12N or more, and further preferably 19.5N or less, more preferably 15N or less, and further preferably 10N or more and 19.5N or less, and more preferably 12N or more and 15N or less.

From the viewpoint of suppressing breakage of the waste tape 10 during stretching of the waste tape, the breaking strength Pf of the fastening portion 18 is preferably 20N or more, more preferably 25N or more, and further preferably 50N or less, more preferably 45N or less, and further preferably 20N or more and 50N or less, and more preferably 25N or more and 45N or less.

From the viewpoint of suppressing the separation of the fixed portion 12 from the outer surface of the diaper 1 when the disposal tape is pulled, the tensile strength Pc at which the fixed portion 18 starts to elongate is preferably lower than the separation strength Pg between the diaper 1 and the fixed portion 12. From the viewpoint of more reliably achieving the above-described effects, the ratio (Pg/Pc) of the peel strength Pg between the diaper 1 and the fixing portion 12 to the tensile strength Pc at which the fastening portion 18 starts to elongate is preferably 3 or more, more preferably 4 or more, furthermore preferably 8 or less, more preferably 7 or less, furthermore preferably 3 or more and 8 or less, more preferably 4 or more and 7 or less.

The peel strength Pg between the diaper 1 and the fixed part 12 is measured by the following method.

[ method of measuring the peel strength between diaper and fixed part ]

The disposal tape in the three-folded state of the diaper is brought into an unfolded state in which the three-folded state is released. Next, the length direction of the waste tape was aligned with the stretching direction, and the fixed portion and the sheet forming the outer surface of the diaper were mounted between chucks of a tensile tester (for example, model "AUTOGRAPH AG-X" manufactured by shimadzu corporation). In this attachment, the waste tape side is attached to the chuck except for the joint of the intermediate portion, and the diaper side is attached to the chuck at positions spaced apart by 10mm in the longitudinal direction from the crotch-side end of the fixing portion toward the crotch. The distance between the chucks was set to 50 mm. Then, the diaper was stretched at a rate of 300mm/min to peel the fixed part from the outer surface of the diaper, and the maximum value of the tensile strength in this process was defined as the peel strength Pg between the diaper and the fixed part.

The diaper 1 has a high rigidity region where the absorbent core 41 is present on the inner side in the thickness direction of the diaper 1, and a low rigidity region where the rigidity is lower than the high rigidity region. In addition, the diaper 1 has a waist gather WG and a leg gather LG (see fig. 1) formed in the peripheral edge region of the diaper 1. The peripheral region is a region on the waist end side of the absorber 40. In order to improve the stretchability of the waist gathers WG and the leg gathers LG, the waist gathers WG and the leg gathers LG are often formed in a low stiffness region.

From the viewpoint of stably applying a tensile force to the intermediate portion 15 and the fixed portion 18, at least a part of the fixed portion 12 is preferably disposed in a high rigidity region inside the low rigidity region. In this case, the fixing portion 12 may be disposed entirely in the high rigidity region. The phrase "inside the low rigidity region" means that the region is located inside the low rigidity region in both the longitudinal direction X and the transverse direction Y. As a method of disposing the disposal tape 10 in the high rigidity region, for example, a method of partially overlapping the absorber 40 with the longitudinal direction inner side of the fixing portion 12 can be cited. As shown in fig. 6, the fixing portion 12 may be entirely overlapped with the absorber 40.

In order to prevent the waste tape 10 from being excessively elongated and to facilitate the winding of the waste tape around the diaper 1, the tensile strength Pc at which the fastening portion 18 starts to be elongated is preferably higher than the tensile strength P3b at which the intermediate portion 15 is elongated 3 times as long as the length before being elongated 3 times. With this configuration, the fixed portion 18 starts to elongate after the intermediate portion 15 has extended 3 times or more the length before the elongation. Here, the length of the intermediate portion 15 before and after the extension is the length of a portion of the intermediate portion 15 that can be extended in the longitudinal direction X1 before and after the extension.

From the viewpoint of more reliably achieving the above-described effects, the ratio (Pc/P3b) of the tensile strength Pc at which the rigid bond section 18 starts to elongate to the tensile strength P3b at 3-fold elongation of the intermediate section 15 is preferably 1.5 or more, more preferably 2.0 or more, and is preferably 3.5 or less, more preferably 3.0 or less, and is preferably 1.5 or more and 3.5 or less, and more preferably 2.0 or more and 3.0 or less.

"tensile strength at elongation of 3 times the length before elongation" is the tensile strength at the time point when the length of the intermediate portion becomes 3 times the length before elongation in the process of stretching at a speed of 300mm/min in the above-mentioned [ method for measuring tensile strength at which elongation starts ].

In the

diaper

1, 1 or more

elastic members

53, 54 extending in the transverse direction Y are disposed in the vicinity of the waist opening 1W and/or the waist portion which is a portion between the waist opening 1W and the leg openings 1L. In the leg opening 1L, an elastic member 52 is disposed along the opening 1L, and the elastic member 52 has a portion extending in the longitudinal direction X. By the expansion and contraction of these elastic members, the diaper 1 fits the body of the wearer, the wearing feeling of the diaper 1 is good, and leakage of excrement can be effectively prevented.

As described above, the diaper 1 has, in addition to the above elastic members, elastic members 62 extending and contracting in the longitudinal direction X in the leakage-preventing cuffs 6. Hereinafter, a portion which is expanded and contracted in a predetermined direction such as the vertical direction X and the lateral direction Y by such an elastic member or the like is also referred to as an expansion/contraction portion.

There is a possibility that irregularities may be formed on the outer surface of the diaper 1 due to the stretchability of the stretchable portion, and when the disposal tape is disposed at a location where such irregularities are formed, there is a fear that accidental peeling may occur. From the viewpoint of reliably fixing the disposal tape 10 to the outer surface of the diaper 1, the fixing portion 12 of the disposal tape 10 is preferably located at a position not overlapping with the stretchable portion in a plan view (plan view) of the diaper 1. As such an embodiment, there is an example in which the end portion 12a of the fixing portion 12 on the crotch portion C side is positioned on the open end 50 side of the waist opening 1W in the longitudinal direction X, compared with the stretchable portion stretchable and contractible in the longitudinal direction X (see fig. 2). At this time, the end 12a of the fixing portion 12 on the crotch portion C side is disposed closer to the opening end 50 side of the waist opening 1W in the back portion B than the end of the cuff elastic member 62 on the back portion B side and the end of the elastic member 52 on the back portion B side disposed along the leg opening. That is, in the longitudinal direction X, the length L10 between the end 12a of the fixed portion 12 on the crotch portion C side and the waist opening end 50 of the back portion B is shorter than the length L12 between the cuff elastic member 62 and the waist opening end 50 and the length L14 between the elastic member 52 disposed at the leg opening portion and the waist opening end 50 (see fig. 2).

In order to more reliably join the disposal tape 10 to the outer surface of the diaper 1, when the length between the end portion 12a on the crotch portion C side of the fixing portion 12 and the waist opening end 50 of the back portion B is L10 (see fig. 2) and the length between the cuff elastic member 62 and the waist opening end 50 is L12 (see fig. 2), the ratio of L12 to L10 (L12/L10) is preferably 1.05 or more, more preferably 1.1 or more, further preferably 2.0 or less, more preferably 1.75 or less, further preferably 1.05 or more and 2.0 or less, more preferably 1.1 or more and 1.75 or less.

From the same viewpoint as described above, when the length between the elastic member 52 disposed in the leg opening portion 1L and the waist opening end 50 is L14 (see fig. 2), the ratio of L14 to L10 (L14/L10) is preferably 1.1 or more, more preferably 1.2 or more, further preferably 2.5 or less, more preferably 2.2 or less, further preferably 1.1 or more and 2.5 or less, and more preferably 1.2 or more and 2.2 or less.

In stretching the waste tape, the tensile strength Pc at which the fastening portion 18 starts to elongate is preferably lower than the breaking strength Ph of the sheet forming the outer surface from the viewpoint of suppressing the split of the sheet forming the outer surface of the diaper. From the viewpoint of more reliably achieving the above-described effects, the ratio (Ph/Pc) of the breaking strength Ph of the sheet forming the outer surface of the diaper 1 to the tensile strength Pc at which the fastening portion 18 starts to elongate (Ph/Pc) is preferably 1.2 or more, more preferably 1.5 or more, and furthermore preferably 3.0 or less, more preferably 2.5 or less, and furthermore preferably 1.2 or more and 3.0 or less, and more preferably 1.5 or more and 2.5 or less.

The breaking strength Ph of the sheet forming the outer surface of the diaper 1 was measured by the following method.

A measuring piece having a length of 150mm in the longitudinal direction and the same length as that of the waste tape in a three-folded state was cut out from a piece forming the outer surface of the diaper 1. Next, the long side of the test piece was aligned with the stretching direction, and the tensile strength was measured in the same manner as in the above-mentioned [ method for measuring tensile strength at the start of elongation ]. The breaking strength of the sheet is the maximum value of the tensile strength that varies with the stretching distance.

On the premise that the tensile strength Pc at which the fixed joint portion 18 starts to elongate is higher than the tensile strength Pb at which the intermediate portion 15 starts to elongate, an appropriate material may be selected as the

sheets

16 and 19 constituting the intermediate portion 15 and the fixed joint portion 18, respectively, so that the intermediate portion 15 and the fixed joint portion 18 can elongate. Specifically, as a material constituting these

sheets

16 and 19, for example, an extensible film can be used. Examples of such a film include multilayer films such as a monolayer film and a coextruded film. As a material constituting the extensible film, for example, polyolefin such as linear low density polyethylene is preferable. Further, at least 1 material selected from the group consisting of polyvinyl chloride, ethylene-vinyl acetate copolymer, and polyvinyl alcohol is also preferable. Further, it is advantageous to use a material having a permanent set of at least 50%, more preferably at least 70%.

As the sheet 13 constituting the fixing portion 12, the same material as the constituent material of the sheet described above may be used, or an arbitrary material that is not stretchable, i.e., is not plastically deformable may be used. For example, any conventionally used known material such as a resin sheet (plastic sheet, film, etc.), nonwoven fabric, woven fabric, etc. can be used without particular limitation. Even if the constituent material of the fixing section sheet 13 is stretchable, the stretchability is not exhibited in the portion fixed to the outer surface of the diaper 1.

As the intermediate portion adhesive portion 17 for releasably joining the intermediate portion 15 and the fixed portion 12 and the fixed portion adhesive portion 20 for releasably joining the fixed portion 18 and the intermediate portion 15, for example, a rubber-based adhesive and an acrylic adhesive are generally used, and a rubber-based adhesive is preferably used. Examples of the rubber-based adhesive include synthetic rubbers such as styrene-butadiene block copolymers and hydrogenated styrene-butadiene block copolymers, and mixtures of these synthetic rubbers and resins. Further, a solid adhesive composed of heat sealing, a hot-melt adhesive, a melt-blown or fibrous adhesive, a liquid adhesive requiring a curing time, or the like may be used.

The intermediate portion adhesive portion 17 and the fastening portion adhesive portion 20 may be formed on the entire 2 nd surface 16b of the intermediate portion sheet 16 and the entire 2 nd surface 19b of the fastening portion sheet 19, respectively. The

adhesive portions

17 and 20 may be formed at intervals. In this case, the

adhesive portions

17 and 20 can be formed at intervals by applying the adhesive at intervals.

The disposal tape 10 provided on the outer surface of the diaper 1 can be produced as follows: the fixing portion sheet 13 is partially laminated on one end portion of the intermediate portion sheet 16, the fixing portion sheet 19 is partially laminated on the other end portion of the intermediate portion sheet 16, and the laminated portions are joined by a known method such as an adhesive to be integrated therewith. In the laminated portion, a folded portion may be formed by folding a part of the sheet as in the above-described embodiment.

The present invention has been described above based on preferred embodiments of the present invention, but the present invention is not limited to the embodiments. For example, in the above embodiment, the disposal tape 10 is provided on the back portion B of the diaper 1, but the location where the disposal tape 10 is provided is not limited thereto, and may be, for example, the abdomen portion a or the crotch portion C.

In the above embodiment, the disposal tape 10 is provided at a substantially central portion in the lateral direction Y of the diaper 1, but the portion where the disposal tape 10 is provided is not limited thereto, and may be provided in, for example, one of the right and left side regions of the diaper 1. Further, in the above embodiment, the disposal tape 10 is disposed such that the longitudinal direction X1 thereof coincides with the longitudinal direction X of the diaper 1, but the direction of the disposal tape 10 is not limited thereto, and for example, the disposal tape 10 may be disposed such that the longitudinal direction X1 thereof coincides with the lateral direction Y of the diaper 1.

In the above embodiment, the other end of the fixing section sheet 19 is joined to the tab sheet 21, but the disposal tape 10 may not have the tab sheet 21.

The pants-type wearing article of the present invention may be a pants-type sanitary napkin or the like, in addition to a pants-type disposable diaper for infants or adults.

The present invention further discloses the following pants-type disposable diaper according to the above embodiment.

<1>

A pants-type disposable diaper having a waist opening and a pair of leg openings and including a stomach-side portion disposed on the stomach side of a wearer in a worn state, a crotch portion disposed in the crotch portion, and a back-side portion disposed on the back side,

a disposal tape is provided on the outer surface of the disposable diaper,

the disposal tape is formed in a three-folded state in which a fixing portion, an intermediate portion, and a fastening portion are arranged in this order in the longitudinal direction of the disposal tape and fixed to the outer surface of the disposable diaper, and the fixing portion, the intermediate portion, and the fastening portion are laminated in this order,

in the waste tape in a three-folded state, the fixed portion and the intermediate portion are releasably joined to each other, and the intermediate portion and the fixed portion are releasably joined to each other,

the fastening portion and the intermediate portion are extensible in the longitudinal direction of the disposal tape in an unfolded state in which the triple-folded state is released,

the tensile strength at which the fixed joint portion starts to elongate is higher than the tensile strength at which the intermediate portion starts to elongate.

<2>

The pants-type disposable diaper according to the above <1>, wherein no other member is present between the fixed portion and the intermediate portion, and the fixed portion and the intermediate portion are provided so as to be directly connected,

there is no other component between the intermediate portion and the fixed portion, and the intermediate portion and the fixed portion are provided so as to be directly connected to each other.

<3>

The pants-type disposable diaper according to the above <1> or <2>, wherein the intermediate portion has an intermediate portion adhesive portion on a surface facing the fastening portion, and the intermediate portion adhesive portion detachably joins the intermediate portion of the waste tape in the three-folded state and the fastening portion.

<4>

The pants-type disposable diaper according to the above <1> to <3>, wherein a tensile strength Pc at which the fastening portion starts to elongate is lower than a breaking strength Pe of the intermediate portion.

<5>

The pants-type disposable diaper according to any one of the above <1> to <4>, wherein a ratio (Pe/Pc) of a breaking strength Pe of the intermediate portion to a tensile strength Pc at which the fixed portion starts to elongate is preferably 2 or more, more preferably 3 or more, and further preferably 6 or less, more preferably 5 or less.

<6>

The pants-type disposable diaper according to any one of the above <1> to <5>, wherein the fastening part is formed so as to be visually changed before and after the extension.

<7>

The pants-type disposable diaper according to any one of the above <1> to <6>, wherein the visual change is a change in color, a deformation of a figure or a symbol, or a combination thereof.

<8>

The pants-type disposable diaper according to any one of the above <1> to <7>, wherein a tensile strength Pb at which the intermediate portion starts to elongate is 1.0N or more, preferably 3.0N or more, and further 6.5N or less, preferably 5N or less.

<9>

The pants-type disposable diaper according to any one of the above <1> to <8>, wherein the tensile strength Pc at which the fastened part starts to elongate is 10N or more, preferably 12N or more, and 19.5N or less, preferably 15N or less.

<10>

The pants-type disposable diaper according to any one of the above <1> to <9>,

the tensile strength Pb of the intermediate portion at which elongation starts is 6.5N or less,

the tensile strength Pc at which the fixed part starts to elongate is 19.5N or less.

<11>

The pants-type disposable diaper according to any one of the above <1> to <10>, wherein the breaking strength Pf of the fastening portion is 20N or more, preferably 25N or more, and 50N or less, preferably 45N or less.

<12>

The pants-type disposable diaper according to any one of the above <1> to <11>, wherein a tensile strength Pc at which the fastening part starts to elongate is lower than a peel strength Pg between the disposable diaper and the fixing part.

<13>

The pants-type disposable diaper according to any one of the above <1> to <12>, wherein a ratio (Pg/Pc) of a peel strength Pg between the disposable diaper and the fixed portion to a tensile strength Pc at which the fixed portion starts to elongate is preferably 3 or more, more preferably 4 or more, and further preferably 8 or less, more preferably 7 or less.

<14>

The pants-type disposable diaper according to any one of the above <1> to <13>, wherein at least a part of the fixing portion is disposed in a high rigidity region located inward of a low rigidity region located in a peripheral edge region of the disposable diaper.

<15>

The pants-type disposable diaper according to any one of the above <14>, wherein the disposable diaper comprises an absorbent core,

the high rigidity region is a region where the absorbent core is present in the thickness direction of the disposable diaper.

<16>

The pants-type disposable diaper according to the above <14> or <15>, wherein the entire fixed portion is disposed in the high rigidity region.

<17>

The pants-type disposable diaper according to any one of the above <1> to <16>, wherein the tensile strength Pc at which the fastening portion starts to elongate is higher than the tensile strength P3b at 3 times elongation of the intermediate portion, and the 3 times elongation of the intermediate portion is a length of 3 times the length of the intermediate portion before elongation.

<18>

The pants-type disposable diaper according to any one of the above <1> to <17>, wherein a ratio (Pc/P3b) of a tensile strength Pc at which the fastening part starts to elongate to a tensile strength P3b at 3-fold elongation of the intermediate part is 1.5 or more, preferably 2.0 or more, and 3.5 or less, preferably 3.0 or less.

<19>

The pants-type disposable diaper according to any one of the above <1> to <18>, wherein the disposable diaper has an extensible part that extends and contracts in the longitudinal direction when a direction extending from the abdomen-side part to the back-side part via the crotch part is taken as a longitudinal direction and a direction orthogonal to the longitudinal direction is taken as a transverse direction,

the waste tape is provided on the back portion, and an end portion of the fixing portion on the crotch portion side is located closer to an opening end side of the waist opening portion than the stretchable portion in the longitudinal direction.

<20>

The pants-type disposable diaper according to the above <19> comprising an absorbent body having a front sheet on a skin-facing surface side and a back sheet on a non-skin-facing surface side, and an absorbent body between the front sheet and the back sheet, the pants-type disposable diaper having leakage preventive cuffs extending in the longitudinal direction X on both side portions of the absorbent body in the longitudinal direction,

the leak protection turn-ups includes: a sheet for forming a turned-up edge; and 1 or more cuff elastic members fixed in an extended state in the longitudinal direction,

in the back portion, an end portion on the crotch portion side of the fixing portion is disposed closer to a waist opening end side of the waist opening than an end portion on the back portion side of the cuff elastic member and an end portion on the back portion side of the elastic member disposed along the leg opening.

<21>

The pants-type disposable diaper according to the above <20>, wherein a ratio of L12 to L10 (L12/L10) is 1.05 or more, preferably 1.1 or more, and 2.0 or less, preferably 1.75 or less, when a length between the crotch-side end portion of the fastening portion and the waist open end of the back portion is L10 and a length between the cuff elastic member and the waist open end is L12.

<22>

The pants-type disposable diaper according to any one of the above <20> or <21>, wherein a ratio of L14 to L10 (L14/L10) is 1.1 or more, preferably 1.2 or more, and 2.5 or less, preferably 2.2 or less, when a length between the crotch-side end portion of the fastening portion and the waist-open end of the back-side portion is L10 and a length between an elastic member disposed in the leg-opening portion and the waist-open end is L14.

<23>

The pants-type disposable diaper according to any one of the above <1> to <22>, wherein a tensile strength Pc at which the fastening part starts to elongate is lower than a breaking strength Ph of a sheet forming the outer surface.

<24>

The pants-type disposable diaper according to any one of the above <1> to <23>, wherein a ratio (Ph/Pc) of a breaking strength Ph of a sheet forming an outer surface of the disposable diaper to a tensile strength Pc at which the fastening part starts to elongate is 1.2 or more, preferably 1.5 or more, and 3.0 or less, preferably 2.5 or less.

Industrial applicability of the invention

According to the present invention, it is possible to prevent the disposal tape from being excessively extended, and to improve the workability of disposing the diaper.

Claims

1. A pants-type disposable diaper having a waist opening and a pair of leg openings, and including a stomach-side portion disposed on the stomach side of a wearer in a worn state, a crotch portion disposed in the crotch portion, and a back-side portion disposed on the back side, characterized in that:

a disposal tape is provided on the outer surface of the disposable diaper,

the tensile strength Pc at which the fixed joint portion starts to elongate is higher than the tensile strength Pb at which the intermediate portion starts to elongate.

2. A pants-type disposable diaper according to claim 1, characterized in that:

no other component is present between the fastening portion and the intermediate portion, which are arranged directly in connection,

3. A pants-type disposable diaper according to claim 1 or 2, characterized in that:

the intermediate portion has an intermediate portion adhesive portion on a surface opposite to the fixing portion, and the intermediate portion adhesive portion releasably bonds the intermediate portion of the waste tape in the three-folded state and the fixing portion.

4. A pants-type disposable diaper according to claim 1 or 2, characterized in that:

the tensile strength Pc at which the rigid joint portion starts to elongate is lower than the breaking strength Pe of the intermediate portion.

5. A pants-type disposable diaper according to claim 1 or 2, characterized in that:

the ratio of the breaking strength Pe of the intermediate portion to the tensile strength Pc at which the fixed portion starts to elongate is 2 or more and 6 or less.

6. A pants-type disposable diaper according to claim 1 or 2, characterized in that:

the fixing portion is formed so as to be visually changed before and after the elongation.

7. A pants-type disposable diaper according to claim 6, characterized in that:

the visual change is a change in color, a distortion of a graphic or symbol, or a combination thereof.

8. A pants-type disposable diaper according to claim 1 or 2, characterized in that:

the tensile strength Pb at which the intermediate portion starts to elongate is 1.0N to 6.5N.

9. A pants-type disposable diaper according to claim 1 or 2, characterized in that:

the tensile strength Pc at which the fixed part starts to elongate is 10N to 19.5N.

10. A pants-type disposable diaper according to claim 1 or 2, characterized in that:

11. A pants-type disposable diaper according to claim 1 or 2, characterized in that:

the fracture strength Pf of the fixed part is 20N or more and 50N or less.

12. A pants-type disposable diaper according to claim 1 or 2, characterized in that:

the tensile strength Pc at which the fastening part starts to elongate is lower than the peel strength Pg between the disposable diaper and the fixing part.

13. A pants-type disposable diaper according to claim 1 or 2, characterized in that:

the ratio of the peel strength Pg between the disposable diaper and the fixing portion to the tensile strength Pc at which the fixing portion starts to elongate is 3 to 8.

14. A pants-type disposable diaper according to claim 1 or 2, characterized in that:

at least a part of the fixing portion is disposed in a high rigidity region located inward of a low rigidity region located in a peripheral region of the disposable diaper.

15. A pants-type disposable diaper according to claim 14, wherein:

the disposable diaper includes an absorbent core having a core portion,

16. A pants-type disposable diaper according to claim 14, characterized in that:

the fixing portion is disposed entirely in the high rigidity region.

17. A pants-type disposable diaper according to claim 1 or 2, characterized in that:

the tensile strength Pc at which the rigid joint portion starts to elongate is higher than the tensile strength P3b at 3 times elongation of the intermediate portion, and the 3 times elongation of the intermediate portion is a length at which the intermediate portion is elongated 3 times as long as the length before elongation.

18. A pants-type disposable diaper according to claim 1 or 2, characterized in that:

the ratio of the tensile strength Pc at which the fastening portion starts to elongate to the tensile strength P3b at 3-fold elongation of the intermediate portion is 1.5 to 3.5.

19. A pants-type disposable diaper according to claim 1, characterized in that:

the disposable diaper has an extensible part that extends and contracts in the longitudinal direction when a direction extending from the stomach-side part to the back-side part via the crotch part is taken as a longitudinal direction and a direction orthogonal to the longitudinal direction is taken as a transverse direction,

20. A pants-type disposable diaper according to claim 19, characterized in that:

the pants-type disposable diaper comprises an absorbent main body having a front sheet on a skin-facing surface side and a back sheet on a non-skin-facing surface side, and an absorbent body between the front sheet and the back sheet, and has leakage preventing cuffs extending in the longitudinal direction on both side portions of the absorbent main body in the longitudinal direction,

the leak protection turn-ups contain: a sheet for forming a turned-up edge; and 1 or more cuff elastic members fixed in an extended state in the longitudinal direction,

21. A pants-type disposable diaper according to claim 20, characterized in that:

when the length between the crotch-side end of the fastening portion and the waist-open end of the back portion is L10 and the length between the cuff elastic member and the waist-open end is L12, the ratio of L12 to L10 is 1.05 or more and 2.0 or less.

22. A pants-type disposable diaper according to any one of claims 20 or 21, characterized in that:

when the length between the crotch-side end of the fastening portion and the waist-open end of the back portion is L10 and the length between the elastic member disposed in the leg-opening portion and the waist-open end is L14, the ratio of L14 to L10 is 1.1 or more and 2.5 or less.

23. A pants-type disposable diaper according to claim 1 or 2, characterized in that:

the tensile strength Pc at which the fastening portion starts to elongate is lower than the breaking strength Ph of a sheet forming the outer surface of the disposable diaper.

24. A pants-type disposable diaper according to claim 1 or 2, characterized in that:

the ratio of the breaking strength Ph of the sheet forming the outer surface of the disposable diaper to the tensile strength Pc at which the fastening part starts to elongate is 1.2 to 3.0.