Disposable diapers

Abstract

The present invention provides a shorts-type disposable diaper, in which the extension portion of the discarding tape can be extended in the length direction of the discarding tape when it is unfolded after being folded. The main body of the diaper has an outer surface (5A) on which a fixed portion (12) of the discarding tape is fixed and an inner sheet (56) located on the skin-opposite side of the outer surface. The diaper has a first region (R1) and a second region (R2) at a portion overlapping with the fixed portion (12). The first region (R1) is located on the side of a connection portion (11) of the fixed portion (12) with the extension portion (15). The diaper has a buffer structure that is deformed in a manner that increases the distance between the outer surface (5A) and the inner sheet (56) when the discarding tape is folded and pulled in a direction perpendicular to the outer surface (5A). The second region (R2) is located on the side of the fixed portion (12) opposite to the connection portion (11), and the increase in distance is smaller than that of the first region (R1).

Description

Technical Field

[0001] The present invention relates to a pants-type disposable diaper having a disposal tape. Background Art

[0002] From the viewpoint of easy and hygienic disposal after use, a shorts-type disposable diaper is known, which has a disposal tape capable of maintaining the disposable diaper in a rolled-up state. For example, the present applicant has previously proposed a shorts-type disposable diaper having a disposal tape, wherein the disposal tape is provided with a fixing portion, an extension portion, and a fixing portion fixed to the outer surface of the disposable diaper along the length direction of the disposal tape, and is maintained in a three-fold state in this order.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent document 1: US2020 / 237582A1 Summary of the invention

[0006] The present invention provides a pants-type disposable diaper having a waist opening and a pair of leg openings, and having an abdominal part arranged on the abdominal side of a wearer in a worn state and a dorsal part arranged on the dorsal side.

[0007] A discarding tape for maintaining the disposable diaper in a discarded state is provided on the outer surface of the main body of the disposable diaper. The discarding tape has a fixed portion, an extension portion, and a fixing portion fixed to the outer surface of the main body arranged in this order along the length direction of the discarding tape, and is provided on the outer surface of the main body in a folded state.

[0008] The surfaces of the discarding tape in the folded state facing each other in the thickness direction are bonded to each other in a releasable manner.

[0009] The extendable portion of the discarding tape can extend in the longitudinal direction of the discarding tape in an expanded state in which the folded state is released.

[0010] The main body portion has an outer surface to which the fixing portion is fixed, and an inner sheet located on the skin-opposite side of the outer sheet forming the outer surface. The main body portion has a first region and a second region at a portion overlapping the fixing portion. The first region is located on the connecting portion side with the elongated portion in the length direction of the fixing portion, and is a region having a buffer structure that is deformed in such a way that the distance between the outer surface and the inner sheet increases when the discarded tape that has been released from the folded state is pulled in a direction perpendicular to the outer surface to which the discarded tape is fixed, and the second region is located on the opposite side of the connecting portion in the length direction of the fixing portion, and is a region where the increase in the distance is smaller than that in the first region. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a perspective view showing one embodiment of the underpants type disposable diaper of the present invention.

[0012] Figure 2 It is schematically indicated Figure 1 The illustrated diagram is a developed plan view of the skin-opposing side of the pants-type disposable diaper in the developed and stretched state.

[0013] Figure 3 yes Figure 2 Schematic cross-sectional view of line II.

[0014] Figure 4 (a) and (b) in the formula are used to indicate Figure 1 The perspective view of the underpants type disposable diaper shown is a state where the discarding tape is stretched.

[0015] Figure 5 Yes means Figure 1 A perspective view of a pants-type disposable diaper in a discarded state is shown.

[0016] Figure 6 (a) to (c) are schematic cross-sectional views schematically showing the structure of the cushioning structure of the underpants-type disposable diaper and the change in the structure of the main body portion when the discarding tape is gradually stretched.

[0017] Figure 7 (a) and (b) are explanatory diagrams of the relationship between the elongation rate including the deformation amount of the main body portion of the diaper and the tensile load, and are explanatory diagrams of the effects of one embodiment of the present invention.

[0018] Figure 8 This is a diagram for explaining the test method of the vertical pull test of the discarding tape. DETAILED DESCRIPTION

[0019] According to the discarding tape described in Patent Document 1, the elongation of the elongated portion increases its length and can be extendedly arranged around the rolled-up diaper, making it easy to keep the diaper in a rolled-up state. However, it is difficult to adjust the force applied until the elongation of the discarding tape begins when a person pulls the discarding tape by hand. In addition, due to the inertia when the hand pulls strongly, it is possible to imagine that the above load is applied to the discarding tape. Since the elongated portion will break if it exceeds the tensile strength (also called the breaking limit elongation) that can be stretched, it is preferred to increase the tensile strength from the viewpoint of suppressing breakage. When the increase is too high, the elongated portion will not extend unless it is pulled strongly, and the discarding operation becomes difficult.

[0020] The present invention relates to a pants-type disposable diaper capable of eliminating the above-mentioned disadvantages of the prior art.

[0021] Hereinafter, the present invention will be described based on preferred embodiments thereof with reference to the drawings.

[0022] Figure 1 1 shows an embodiment of the shorts-type disposable diaper of the present invention. The shorts-type disposable diaper 1 shown in the figure (hereinafter simply referred to as "diaper 1") has a waist opening 1W through which the waist of the wearer passes, and a pair of leg openings 1L, 1L through which the lower limbs of the wearer pass. The diaper 1 includes an absorbent body 4 having a front sheet 2, a back sheet 3 and an absorbent body 40, and an outer body 5 arranged on the non-skin-opposite side of the absorbent body 4. The outer body 5 forms the non-skin-opposite side of the diaper 1, that is, the outer surface of the diaper 1.

[0023] In this specification, the "skin-opposing surface" refers to the surface of the diaper or its components (e.g., the front sheet) that faces the skin side of the wearer when worn, that is, the surface that is relatively close to the skin side of the wearer, and the "non-skin-opposing surface" refers to the surface of the diaper or its components that faces the side opposite to the skin side (the wearing side) when worn, that is, the surface that is relatively away from the skin side of the wearer. In addition, "when worn" here means maintaining a normal appropriate wearing position, that is, maintaining the state of the correct wearing position of the diaper 1.

[0024] The diaper 1 includes an abdominal portion A disposed on the abdominal side of the wearer in the worn state, a crotch portion C disposed in the crotch portion, and a dorsal portion B disposed on the dorsal side of the wearer. The diaper 1 is bonded to each other at both side edges of the outer body 5 along the longitudinal direction X in each of the abdominal portion A and the dorsal portion B by a known bonding method such as bonding agent, heat sealing, ultrasonic sealing, etc. Thus, the waist opening 1W and the pair of leg openings 1L, 1L are formed.

[0025] exist Figure 2, the diaper 1 is shown in the unfolded and stretched state. The "unfolded and stretched state" of the diaper 1 means that the diaper 1 is in the unfolded state after the edges of the outer bodies 5 of the ventral part A and the dorsal part B are joined to each other at both sides along the longitudinal direction X and the diaper 1 is cut (torn) apart, and the unfolded diaper 1 is stretched to the elastic components of each part to the designed size (the same size as when the diaper is stretched to a flat surface without the influence of the elastic components).

[0026] The diaper 1 has a longitudinal direction X corresponding to a direction extending from the ventral portion A through the crotch portion C to the dorsal portion B, and when the diaper 1 is Figure 2 The diaper 1 is formed as shown in the state of being expanded into a plane, and the lateral direction Y is perpendicular to the longitudinal direction X. The longitudinal direction X coincides with the length direction of the absorbent body 4. Figure 2 As shown, the diaper 1 is bilaterally symmetrical with respect to a longitudinal center line CL extending in the longitudinal direction X and dividing the diaper 1 into two equal parts in the transverse direction Y.

[0027] The outer body 5 is as follows Figure 2 and Figure 3 As shown, the diaper 1 includes an outer sheet 55, an inner sheet 56 disposed on the skin-facing side of the outer sheet 55, and a plurality of elastic members 53, 54 disposed in a stretched state between the two sheets 55, 56. The outer sheet 55 forms the outer surface of the diaper 1, and the outer sheet 55 is adjacent to the inner sheet 56. The outer sheet 55 and the inner sheet 56 are preferably made of nonwoven fabrics. As the nonwoven fabric, nonwoven fabrics based on various manufacturing methods can be used, for example, nonwoven fabrics based on various manufacturing methods such as spunbond nonwoven fabrics, thermally bonded nonwoven fabrics, spunlace nonwoven fabrics, meltblown nonwoven fabrics, and hot air nonwoven fabrics can be used. Among these nonwoven fabrics, spunbond nonwoven fabric or hot air nonwoven fabric is preferably used as the outer layer sheet 55 from the viewpoints of good texture and breathability, satisfying the necessary physical properties such as strength when used in the diaper 1, and being available at a relatively low price. As the inner layer sheet 56 (inner square sheet), spunbond nonwoven fabric is preferably used from the viewpoints of good breathability, satisfying the necessary physical properties such as strength when used in the diaper 1, and being available at a relatively low price.

[0028] The outer body 5 has an elastic region G that expands and contracts in the transverse direction Y by the expansion and contraction of the elastic members 53 and 54. More specifically, the elastic region G includes a waist elastic region G1 formed outside the absorbent body 4 in the longitudinal direction X, and a lower elastic region G2 formed on the crotch C side relative to the waist elastic region G1.

[0029] The diaper 1 has a ventral waist stretch region FG1 located on the ventral part A side and a dorsal waist stretch region BG1 located on the dorsal part B side as the waist stretch region G1, and has a ventral lower stretch region FG2 located on the ventral part A side and a dorsal lower stretch region BG2 located on the dorsal part B side as the lower stretch region G2. Figure 2 In the figure, reference numeral 53 denotes an elastic member 53 disposed in the waist stretch region G1, and reference numeral 54 denotes an elastic member 54 disposed in the lower stretch region G2 around the waist.

[0030] The elastic waist region G1 is formed outside each of the two ends 4a and 4b of the absorbent body 4 in the longitudinal direction X. The elastic waist region G1 is arranged at the waist of the wearer in the worn state.

[0031] The lower stretchable region G2 is formed between the ends 4a, 4b of the absorbent body 4 in the longitudinal direction X and the lower end of the side seal 7 in the longitudinal direction X of each of the ventral portion A and the dorsal portion B. In the lower stretchable region G2, the elastic member 54 is arranged to extend in the transverse direction Y at least between the side seal 7 and the side edge of the absorbent body 4 extending in the longitudinal direction X. The elastic member 54 is preferably arranged in an extended state in the transverse direction Y in the portion crossing the absorbent body 4, but instead of this structure, the elastic member 54 may not be arranged between the both side edges of the absorbent body 4 along the longitudinal direction X, or the elastic member 54 may be arranged in a state in which a process such as being precisely performed is performed so as not to exhibit elastic stretchability.

[0032] The absorbent body 40 of the diaper 1 of this embodiment is as follows Figure 3 As shown, the absorbent core 41 includes a liquid-retaining absorbent core 41 and a core wrap sheet (core wrap sheet) 42 covering (wrapping) the skin-facing surface and the non-skin-facing surface of the absorbent core 41. The absorbent core 41 includes a water-absorbent polymer and a hydrophilic fiber. The core wrap sheet 42 may be a single sheet covering the entire circumference of the absorbent core 41, or may be a core wrap sheet covering the entire circumference of the absorbent core 41 by two or more sheets.

[0033] Diapers 1 Figure 2 As shown, the two sides of the absorbent body 4 along the longitudinal direction X are provided with leak-proof cuffs 6, 6 extending along the longitudinal direction X. The leak-proof cuffs 6, 6 include: a water-repellent cuff-forming sheet 61 continuous over the entire length of the absorbent body 4 in the longitudinal direction X; and one or more cuff elastic members 62 fixed in a stretched state in the longitudinal direction X on the inner side of the cuff-forming sheet 61 in the transverse direction Y. The leak-proof cuffs 6, 6 stand up (erect) toward the skin-opposing side by having the cuff elastic members 62.

[0034] As materials used for components such as the outer body 5, the front sheet 2, the back sheet 3 and the absorbent body 40 included in the absorbent body 4, and the leakage-barrier cuffs 6, 6, the same materials as those conventionally used in the technical field can be used without particular limitation.

[0035] The diaper 1 of this embodiment is provided with a discard tape on the outer body 5. Specifically, Figure 1 As shown in the figure, a discarding tape 10 is provided on the outer surface 5A of the outer body 5 of the back side portion B. The discarding tape 10 is a member used to maintain the discarding state of the diaper 1. The discarding tape 10 is located in the substantially central portion of the back side portion B of the diaper 1 in the transverse direction Y. In addition, the discarding tape 10 of this embodiment is provided in a manner such that its longitudinal direction X1 is consistent with the longitudinal direction X of the diaper 1 in the trifolded state.

[0036] Figure 3 yes Figure 2 Schematic cross-sectional view of line II. Figure 3 , a cross-sectional structure of a discarded adhesive tape 10 in a three-folded state is shown. The discarded adhesive tape 10 is mainly composed of three parts. Specifically, the discarded adhesive tape 10 is composed of a fixed portion 12, an extension portion 15, and a fixing portion (fixing portion) 18. These fixed portions 12, extension portions 15, and fixing portions 18 are arranged in this order along the length direction X1 of the discarded adhesive tape 10. The discarded adhesive tape 10 of this embodiment is formed in a three-folded state in which the fixed portion 12, the extension portion 15, and the fixing portion 18 are stacked in this order.

[0037] The discarding tape 10 is placed on the outer surface of the main body of the diaper in a folded state, but the "folded state" is not limited to the above-mentioned three-folded state, and may be a two-folded state in which the fixing portion 12, the extension portion 15, and the fixing portion 18 are folded. For example, an example may be a state in which only the fixing portion 12 and the extension portion 15 are folded, and the extension portion 15 and the fixing portion 18 overlap on the fixing portion 12. However, the discarding tape 10 before use in the unfolded state is formed in a three-folded state and has a structure in which the fixing portion 12, the extension portion 15, and the fixing portion 18 overlap in this order, which is not only compact but also easy to pull out the fixing portion 18 in the stretching direction of the discarding tape 10, which is preferred in terms of facilitating the discarding operation.

[0038] The folded discarded adhesive tape 10 preferably has the fixed portion 12 folded with the extension portion 15 and the fixing portion 18, or the fixed portion 12, the extension portion 15 and the fixing portion 18 folded. In addition, in the discarded adhesive tape 10 in which the fixed portion 12, the extension portion 15 and the fixing portion 18 are folded in such a state, it is preferred that the surfaces opposite to each other in the thickness direction are joined so as to be peelable from each other. In the discarded adhesive tape folded in other ways, it is preferred that the surfaces opposite to each other in the thickness direction are peelable from each other. The thickness direction referred to herein is a direction perpendicular to the outer surface of the main body portion to which the discarded adhesive tape 10 is fixed, and is a direction in which the fixed portion 12 overlaps with the extension portion 15 and the fixing portion 18, or a direction in which the fixed portion 12, the extension portion 15 and the fixing portion 18 overlap.

[0039] The fixing portion 12 of the waste tape 10 has a fixing portion sheet 13. The fixing portion sheet 13 has a first surface 13a and a second surface 13b. In the waste tape 10 that is in a three-folded state, the fixing portion sheet 13 has a first surface 13a opposite to the extension portion 15, and a second surface 13b opposite to the outer surface of the diaper 1, except for the folded portion 13' described later. In addition, the fixing portion 12 has a fixing portion adhesive portion 14. The fixing portion adhesive portion 14 is provided on the second surface 13b of the fixing portion sheet 13. The fixing portion 12 is fixed to the outer surface of the back portion B of the diaper 1 by the fixing portion adhesive portion 14. The waste tape 10 is fixed to the outer surface of the back portion B of the diaper 1 via the fixing portion adhesive portion 14 in an undetachable manner. 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, fusion, etc. can be used.

[0040] The extension portion 15 has an extension portion sheet 16. The extension portion sheet 16 may have the same length as the previously described fixed portion sheet 13, or may have a different length. In addition, the extension portion sheet 16 may have the same width as the fixed portion sheet 13, or may have a different width. The extension portion sheet 16 has a first surface 16a and a second surface 16b. In the waste adhesive tape 10 that is in a three-folded state, the extension portion sheet 16 has a first surface 16a that is opposite to the fixing portion 18, and a second surface 16b that is opposite to the fixed portion 12, except for the portion that overlaps with the folding portion 16' and the folding portion 13' described later.

[0041] The extension part 15 has an extension part adhesive part 17. The extension part adhesive part 17 is provided on the second surface 16b of the extension part sheet 16. The extension part adhesive part 17 is a portion where the extension part 15 and the fixing part 12 are releasably joined in the discarding tape 10 which will be in a trifolded state. Therefore, the extension part adhesive part 17 is preferably composed of an adhesive with low adhesiveness.

[0042] The fixing portion 12 described above is as follows Figure 3As shown, the fixing portion sheet 13 has a folded portion 13' folded toward the extension portion 15 at one end in the longitudinal direction X1 of the discarding tape 10. The folded portion 13' is bonded to one end of the extension portion sheet 16 of the extension portion 15 on the second surface 16b side. Thus, the fixing portion 12 is directly connected to the extension portion 15. As a method for connecting the fixing portion 12 and the extension portion 15, a known method such as a hot melt adhesive, fusion, or a combination of the two can be used.

[0043] The fixing portion 18 of the discarding tape 10 can be fixed to any position of the outer surface of the diaper 1 (the outer surface 5A of the outer body 5), and is fixed to the outer surface 5A of the diaper 1 when the discarding tape 10 is used to maintain the discarded state of the diaper 1. The fixing portion 18 forms the front end area of ​​the discarding tape 10 and has a fixing portion sheet 19. The fixing portion sheet 19 can be the same length as the fixed portion sheet 13 or the extension portion sheet 16, or a different length. The fixing portion sheet 19 can be the same width as the fixed portion sheet 13 or the extension portion sheet 16, or a different width. The fixing portion sheet 19 has a first surface 19a and a second surface 19b. In the discarding tape 10 in the three-fold state of the present embodiment, the second surface 19b of the fixing portion sheet 19 is opposite to the extension portion 15.

[0044] The fixing portion 18 has a fixing portion adhesive portion 20. The fixing portion adhesive portion 20 is provided on the second surface 19b of the fixing portion sheet 19. The fixing portion adhesive portion 20 is a portion that releasably joins the fixing portion 18 and the extension portion 15 of the discarding tape 10 in a trifolded state, and reliably fixes the fixing portion 18 to an arbitrary position on the outer surface of the diaper 1. The degree of adhesiveness of the fixing portion adhesive portion 20 is determined from this viewpoint.

[0045] The extension part sheet 16 in the extension part 15 mentioned above has a folded part 16' folded toward the fixing part 18 at one end in the longitudinal direction X1. The folded part 16' is joined to one end of the fixing part sheet 19 in the fixing part 18 on the second surface 19b side. Thus, the extension part 15 is directly connected to the fixing part 18. At the other end of the fixing part sheet 19 in the fixing part 18, a pinching piece 21 is combined on the second surface 19b side. The pinching piece 21 and the fixing part sheet 19 are separate sheets.

[0046] As a method of connecting the extension portion 15 and the fixing portion 18 and a method of joining the tab 21 and the fixing portion sheet 19, known methods such as adhesives such as hot melt adhesives, fusion, or a combination of these can be used.

[0047] The discarding tape 10 composed of the three parts of the fixing part 12, the extension part 15 and the fixing part 18 in this embodiment is folded in three parts in a Z shape. The discarding tape 10 is attached to the back part B of the diaper 1 in such a manner that the free end of the discarding tape 10 in the three-folded state, that is, the attachment part of the tab 21 in the fixing part 18, faces the waist opening 1W side of the diaper 1.

[0048] The extension portion 15 and the fixing portion 18 of the waste tape 10 are capable of expansion and contraction in the length direction X1 of the waste tape 10. In this embodiment, the direction in which the waste tape 10 in the length direction X1 expands is referred to as the expansion direction X1A, and the direction in which the waste tape 10 contracts is referred to as the contraction direction X1B. Figure 4 As shown in (a), the discarded adhesive tape 10 which is in a three-folded state is unfolded and unfolded, and a person holds the fixed portion 18 by hand and stretches it in the extension direction X1A of the adhesive tape. When a tensile force is applied to the discarded adhesive tape 10 in this way, Figure 4 (b) The elongated portion 15 and the fixed portion 18 shown are extended respectively, so that the length of the waste tape 10 is increased. In the present embodiment, the elongated portion 15 and the fixed portion 18 can be extended in the elongation direction X1A of the waste tape 10 in the unfolded state in which the three-folded state is released. Here, the so-called unfolded state in which the three-folded state is released refers to the state in which the elongated portion 15 and the fixed portion 12 of the waste tape 10 are peeled off, and the elongated portion 15 and the fixed portion 18 are peeled off, and the waste tape 10 in the three-folded state is unfolded into a straight line. In the above unfolded state, the waste tape 10 can be stretched by human force, and at this time, the elongated portion 15 and the fixed portion 18 can be extended.

[0049] exist Figure 5 The diaper 1 is shown in the figure in the form of disposal when it is disposed of. Figure 1 The diaper 1 shown in the figure is rolled up from the crotch portion C toward the waist opening 1W in such a way that the ventral portion A faces inward, so as to form a Figure 5 In the rolled-up diaper 1, the discarding tape 10 provided on the back side portion B is exposed outside the rolled-up diaper 1. In this state, Figure 4 As shown in (b), the discarding tape 10 is stretched and wrapped around the outer periphery of the rolled-up discarded diaper 1, and the fastening portion 18 is fixed to the outer surface 5A, thereby maintaining the diaper 1 in the discarded state.

[0050] In the present embodiment, the discard tape 10 is disposed at a position facing the absorbent core 41 of the absorber 40 .

[0051] The diaper 1 of this embodiment includes a disposal tape 10 and a main body portion 1A having the disposal tape 10 fixed on the outer surface. The main body portion 1A includes an outer body 5 and an absorbent body 4 fixed to the skin-facing side of the outer body 5. The outer surface 5A of the main body portion 1A in the diaper 1 is constituted by the outer surface of the outer sheet 55 forming the non-skin-facing side of the outer body 5.

[0052] Hereinafter, the main body portion 1A of the diaper 1 is also referred to as a diaper main body 1A.

[0053] Diaper body 1A Figure 3 and Figure 6 As shown in FIG. 1 , the outer surface 5A having the fixing portion 12 fixed with the discarding tape 10 and the inner sheet 56 located on the skin-opposing side of the outer surface 5A. Figure 6 As shown, at the portion overlapping with the fixing portion 12 of the discard tape 10, the diaper body 1A has a first region R1 on the side of the connecting portion 11 with the extension portion 15 in the longitudinal direction X1 of the fixing portion 12, and has a second region R2 on the side opposite to the connecting portion 11 in the longitudinal direction X1 of the fixing portion 12.

[0054] The first region R1 is Figure 6 As shown in (b), the cushioning structure is deformed in such a way that the distance between the outer surface 5A and the inner square sheet as the inner sheet 56 in the diaper 1 increases when the discarded tape 10 released from the trifolded state is pulled in a direction perpendicular to the outer surface 5A to which the discarded tape 10 is fixed increases. On the other hand, in the second region R2, compared with the first region R1, the increase in the distance between the outer surface 5A and the inner sheet 56 (inner square sheet) is smaller when the discarded tape 10 released from the trifolded state is pulled in a direction perpendicular to the outer surface 5A. The distance between the outer surface 5A and the inner sheet 56 (inner square sheet) is measured along the normal direction of the surface of the inner sheet 56 (inner square sheet).

[0055] The buffer structure is a structure that deforms other parts of the discarding tape 10, i.e., the main body of the diaper 1, before the extension part 15 starts to extend when the discarding tape 10 is pulled while the fixing part 12 of the discarding tape 10 is fixed to the diaper 1. When the discarding tape 10 is provided with the buffer structure, the time when the discarding tape starts to extend is advanced, but the time when the extension part such as the extension part 15 starts to extend is delayed. By providing such a buffer structure, at the beginning of the pulling of the discarding tape 10, not only the discarding tape 10 but also the main body of the diaper is deformed, so that the extension of the discarding tape 10 relative to the tensile load N at the beginning of the pulling of the discarding tape 10 can be suppressed.

[0056] The buffer structure is preferably present in the outer body 5 of the diaper body. The structure of the buffer structure is not limited to the deformation of the outer body 5, and includes a portion that is deformed with the pulling when the discarding tape 10 is pulled in a vertical direction relative to the outer surface 5A of the outer body 5 of the fixing portion 12. That is, the buffer structure or the position where it is formed can be arbitrarily set according to the position of the fixing portion 12. The independent structure of the buffer structure will be described later.

[0057] Since the diaper body 1A has the first region R1 having a buffer structure in the portion overlapping with the fixing portion 12 of the discarding tape 10 , it is possible to suppress the discarding tape 10 from being broken due to excessive elongation.

[0058] For this function, refer to Figure 7 (a) and Figure 7 (b) Explanation. Figure 7 (b) is a diagram schematically showing the relationship between the elongation of the amount of deformation of the protective cushioning structure and the pulling load when the discarding tape 10 is pulled, in the case where the diaper body 1A has a first region R1 having a cushioning structure at a portion overlapping with the fixing portion 12 of the discarding tape 10, as in the diaper 1, Figure 7 (a) is a similar graph in the case where the diaper body 1A does not have such a cushioning structure.

[0059] like Figure 7 As shown in (a), there is no buffer structure, and the reaction force immediately after the waste tape 10 is pulled is relatively large, and it is difficult to feel the extension of the waste tape 10. Therefore, after the pulling force exceeds the pulling strength of the elongation part at the beginning of the extension, it becomes easy to act until it reaches the breaking point all at once, and in the case of people who are not used to using the waste tape 10 with the elongation part, the waste tape 10 breaks depending on the situation.

[0060] In contrast, Figure 7 As shown in (b), if the first region R1 having a buffer structure is provided in the portion overlapping with the fixed portion 12 of the discarding tape 10, the reaction force immediately after the discarding tape 10 starts to be pulled is small, so the discarding tape 10 is not pulled hard until the elongation portion 15 starts to elongate. Thus, the discarding tape 10 can be pulled while adjusting the pulling load, and after exceeding the pulling strength at which the elongation portion starts to elongate, the pulling force is prevented from acting until it reaches the breaking point. Thus, the breakage caused by excessive elongation of the discarding tape 10 can be suppressed without impairing the operability during discarding.

[0061] In addition, in the diaper 1, the diaper body 1A has not only a first area R1 with a cushioning structure but also a second area R2 without a cushioning structure in the portion that collides with the fixing portion 12 of the disposal tape 10. Therefore, compared with the case where the cushioning structure exists in the entire portion overlapping with the fixing portion 12, it is possible to suppress the occurrence of problems such as damage to the sheet forming the outer surface 5A or detachment of the disposal tape 10 from the diaper body as the case may be.

[0062] Figure 6 FIG. 1 is a diagram showing a preferred embodiment of the first region R1 and the second region R2 provided at a location overlapping with the fixing portion 12. Figure 6 In the middle, the left side is the waist opening side, and the right side is the crotch C side.

[0063] Figure 6 The first region R1 of the embodiment shown in the figure has a gap forming structure as a buffer structure. Figure 6 As shown in (a), the discarded adhesive tape 10 is unfolded from the folded state and unfolded. Figure 6 As shown in (b), when the discarding tape 10 is pulled in a direction perpendicular to the outer surface 5A to which the discarding tape 10 is fixed by a force weaker than the pulling load at which the extension portion 15 starts to extend, a gap S is generated between the outer layer sheet 55 forming the outer surface 5A and the inner layer sheet 56 located inwardly adjacent to the outer layer sheet 55. The release of the folded state of the discarding tape 10 in this embodiment is the release of the three-folded state.

[0064] On the other hand, in the second region R2, there is no gap forming structure that causes peeling between the outer layer sheet 55 and the inner layer sheet 56 that form the outer surface 5A when the waste tape 10 is pulled in a direction perpendicular to the outer surface 5A that fixes the waste tape 10 with a force weaker than the pulling load at which the elongation portion 15 starts to stretch.

[0065] When the diaper body has such a gap forming structure, the discarding tape 10 as a whole starts to stretch earlier, but since the stretching is caused by the deformation of the outer surface 5A (outer layer sheet 55) being pulled upward, the actual stretching start time of the stretchable part such as the stretching part 15 can be delayed. Figure 6 (c) shows that even from Figure 6 When the state (b) is further pulled, the buffer structure is provided, so that at the beginning of pulling of the discard tape 10, not only the discard tape 10 but also a part of the diaper body is deformed, thereby suppressing the rapid increase of the pulling force at the beginning of pulling of the discard tape 10, thereby preventing the elongated portion of the discard tape 10 from breaking.

[0066] The first tensile test for measuring the tensile load at which the elongation portion 15 starts to elongate, the tensile load at which the fixing portion 18 starts to elongate, and the like will be described.

[0067] In the first pulling test, among the fixed portion 12, the extension portion 15 and the fixing portion 18 constituting the discarding tape 10, the extension portion 15 and the fixing portion 18 are removed from the discarding tape 10 as test pieces, and the pulling test is performed independently. The test piece used in the pulling test may be prepared and used in the same configuration as the extension portion 15 and the fixing portion 18 instead of being taken from the discarding tape 10.

[0068] In the first pulling test, for each of the elongation portion 15 and the fixed portion 18, the two ends of the discarded tape 10 in the length direction X1 are gripped by the upper and lower chucks of the pulling tester, and a pulling load (vertical stress) is applied by pulling in the direction away from the chuck (vertical direction), and the elongation (vertical deformation) of the elongation portion 15 and the fixed portion 18 is measured. The expansion speed (pulling speed) of the chuck distance is set to 300mm / min. The length (initial length) of the sample between the chucks when the upper and lower chucks are gripped is set to 10mm, and for each of the elongation portion 15 and the fixed portion 18, the pulling load that changes with the increase of the distance between the chucks (pulling distance) is measured. The pulling load at the beginning of the elongation of the above-mentioned parts is used as the load of the first maximum point measured. The first maximum point is the maximum point that appears for the first time in the curve of the measured pulling load. When the first local maximum point cannot be clearly determined or cannot be observed, the maximum load at an elongation between 10% and 50% is regarded as the first local maximum point strength.

[0069] The following vertical pulling test is performed to determine whether peeling occurs between the outer layer sheet 55 and the inner layer sheet 56 (inner square sheet) by a force weaker than the pulling load at which the elongation portion 15 starts to extend obtained by the first pulling test.

[0070] [Test method for vertical pull test]

[0071] In the vertical pull test, the discarding tape 10 in an extended state is pulled in a direction perpendicular to the outer surface 5A of the main body portion of the diaper to which the discarding tape 10 is fixed, and changes occurring inside the main body portion are examined.

[0072] In the vertical pull test, first, the diaper 1 with the discard tape 10 attached to the outer surface 5A of the main body portion is pulled with the width direction center line C1 (refer to Figure 1) is taken as the folding peak, and the positions of the left and right side sealing parts 7 are overlapped with each other on the skin-facing side of the diaper, so as to form a state in which the skin-facing sides of the right half and the left half of the diaper 1 are in surface contact with each other.

[0073] Joining, such as Figure 8 As shown, the diaper 1 is held by the lower chuck 81 of the upper and lower chucks of the pull tester in a position where the upper edge of the lower chuck 81 coincides with the positions of the left and right side seals 7, so that the skin-facing surfaces of the left and right side seals are pressed against each other. At this time, the width direction central axis C8 of the lower chuck 81 and the connection portion 11 of the fixing portion 12 of the discarding tape 10 and the extension portion 15 are aligned.

[0074] The upper chuck 82 of the tensile tester is twisted 90 degrees relative to the lower chuck 81 about the center line connecting the upper and lower chucks, and clamps the end of the fastening portion 18 of the waste tape 10 in the unfolded state.

[0075] In this state, the pulling test is performed. The pulling speed is set to 10 mm / min, and the pulling tester is stopped when the measured load reaches the pulling load at which the elongation portion 15 starts to stretch, which is obtained based on the result of the first pulling test. Then, it is confirmed whether peeling occurs between the outer layer sheet 55 and the inner layer sheet 56 (inner square sheet).

[0076] In the case of the diaper 1 of this embodiment, Figure 6 As shown in (b) and (c), no peeling occurs between the outer layer sheet 55 and the inner layer sheet 56 (inner square sheet) in the second region R2, but peeling occurs between the outer layer sheet 55 and the inner layer sheet 56 (inner square sheet) at least in the first region R1, and the fixed portion 12 of the discarding tape 10 and the outer layer sheet 55 are deformed to be suspended by the connecting portion 11 of the fixed portion 12 of the discarding tape 10 and the extension portion 15. In addition, along with this deformation, peeling occurs between the outer layer sheet 55 and the inner layer sheet 56 (inner square sheet) in the region adjacent to the connecting portion 11 in the horizontal direction Y.

[0077] The outer layer sheet 55 is made of a commonly used 10 to 30 g / m 2 In the case of a spunbonded nonwoven fabric or hot air nonwoven fabric of a certain degree, it can be confirmed through the outer layer sheet from the area adjacent to the connecting portion 11 in the horizontal direction Y that peeling has occurred between the outer layer sheet 55 and the inner layer sheet 56 (inner square sheet) in the first region R1. In the case where it is difficult to confirm, an incision is made in the outer layer sheet 55 in the area adjacent to the connecting portion 11 in the horizontal direction Y, and the peeling between the outer layer sheet 55 and the inner layer sheet 56 (inner square sheet) is confirmed by visual inspection. This state observation can be performed while the sample is maintained in the state held by the chuck of the pulling test machine, or the sample can be removed from the test machine.

[0078] In addition, the above test methods such as Figure 2 As shown, the discarding tape 10 is installed on the outer surface 5A of the main body portion at a position that coincides with the longitudinal center line CL that divides the diaper 1 into two equal parts in the transverse direction Y, and the left and right side sealing portions 7 are also parallel to the longitudinal center line CL that divides the diaper 1 into two equal parts in the transverse direction Y, and are symmetrical with respect to the longitudinal center line CL. When the discarding tape 10 is not at a position that coincides with the longitudinal center line CL, the diaper 1 is divided into two parts in the circumferential direction in a plane connecting the position of the discarding tape 10 and the position opposite to the position in the circumferential direction of the diaper 1, so that the inner surfaces of the two parts are in contact with each other, and the chuck of the pulling test machine is gripped to perform the same vertical pulling test. The upper edge of the lower chuck 81 coincides with the central position of the height direction of the fixed diaper 1.

[0079] In the gap forming structure existing in the first region R1, the outer layer sheet 55 and the inner layer sheet 56 as the inner square sheet may not be joined originally, but it is preferable to Figure 6 As shown in (a) and (b), the bonding is weak so that peeling occurs when the discarding tape 10 is pulled with a force weaker than the pulling load at which the elongation portion 15 starts to extend.

[0080] When peeling occurs between the joined sheets, a gap gradually appears as the peeling between the sheets proceeds after the pulling of the tightly joined discarding tape 10 begins. Since the work (energy) accompanying the peeling between the sheets is gradually consumed in this process, the effect of not pulling the discarding tape 10 with great force until the elongation portion 15 begins to extend can be further promoted.

[0081] In addition, after the pulling of the tightly joined discarding tape begins, the pulling load is suppressed from increasing sharply, and damage to the outer surface 5A or the outer layer sheet constituting the outer surface 5A caused by the provision of a buffer structure is prevented, so as to form a diaper that is easy to use and not easy to break with the discarding tape 10. Preferably, the joining strength between the outer layer sheet 55 and the inner layer sheet 56 (inner square sheet) in the first region R1 is lower than the joining strength between the outer layer sheet 55 and the inner layer sheet 56 (inner square sheet) in the second region R2.

[0082] [Method for measuring bonding strength]

[0083] The bonding strength between the outer layer sheet 55 and the inner layer sheet 56 (inner square sheet) in the first region R1 and the second region R2 was measured in the following manner.

[0084] First, peel off each of the outer layer sheet 55 and the inner layer sheet 56 (inner square sheet) in the area of ​​the diaper 1 including the portion where the discard tape 10 is installed. Join and cut off the excess outer layer sheet 55 and the inner layer sheet 56 (inner square sheet) along the long side of the discard tape 10. And, measure the bonding strength between the outer layer sheet 55 and the inner layer sheet 56 (inner square sheet) by a T-type peel test. The peeling direction is along the length direction of the discard tape 10. In addition, the bonding strength is the maximum value of the maximum point strength in each area of ​​the first area R1 and the second area R2 as the measured value of each area,

[0085] The bonding strength between the outer layer sheet 55 and the inner layer sheet 56 (inner square sheet) in the first region R1 is preferably 90% or less, more preferably 75% or less, compared with the bonding strength between the outer layer sheet 55 and the inner layer sheet 56 (inner square sheet) in the second region R2. In addition, it is preferably 0% or more, more preferably 25% or more, and preferably 0% or more and 90% or less, more preferably 25% or more and 75% or less.

[0086] In addition, after the pulling of the tightly joined discarding tape begins, the pulling load is suppressed from increasing sharply, and damage to the outer surface 5A or the outer layer sheet constituting the outer surface 5A caused by the provision of a buffer structure is prevented, so as to form a diaper that is easy to use and not easy to break with the discarding tape 10. In view of this, the joining strength between the outer layer sheet 55 and the inner layer sheet 56 (inner square sheet) in the second region R2 is preferably 110% or more, more preferably 125% or more, and preferably 200% or less, more preferably 150% or less, and preferably 110% or more and 200% or less, and more preferably 125% or more and 150% or less, relative to the pulling load at which the elongation portion 15 starts to stretch.

[0087] Similarly, after the pulling of the tightly connected discarding tape begins, the pulling load is suppressed from increasing sharply, and the damage of the outer surface 5A or the outer layer sheet constituting the outer surface 5A caused by the provision of a buffer structure is prevented, so as to form a diaper that is easy to use and not easy to break with the discarding tape 10. In the length direction X1 of the fixing portion 12, the length L1 from the connecting portion 11 with the extension portion 15 in the fixing portion 12 to the second region R2 is preferably more than 10% of the full length L of the fixing portion 12, more preferably more than 25%, and further preferably less than 90%, more preferably less than 75%, and further preferably more than 10% and less than 90%, more preferably more than 25% and less than 75%.

[0088] In the diaper 1 of this embodiment, as Figure 6As shown in (b), the main body 1A has a third region R3 on the opposite side of the connecting portion 11 with the extension portion 15 in the clamping portion 12 and the side having the first region R1 and the second region R2, and the third region R3 has a gap forming structure having the same structure as that in the first region R1. In the third region R3 on the opposite side of the first region R1, the outer layer sheet 55 and the inner layer sheet 56 (inner square sheet) are peeled off by a force weaker than the pulling load at the beginning of the extension of the extension portion 15, and the gap forming structure between the outer surface 5A and the inner layer sheet 56 (inner square sheet) is increased, which can more reliably prevent the extension portion 15 from being broken or the outer layer sheet 55 forming the outer surface from being damaged.

[0089] In the diaper 1 of this embodiment, by having the third region R3, when pulled with a force weaker than the pulling load at the beginning of the extension of the extension portion 15, the diaper 1 can be stretched. Figure 6 As shown in (b), a space having a triangular cross-sectional shape having a vertex near the connecting portion 11 and having a cross section along the length direction X1 of the fixing portion 12 is formed between the outer layer sheet 55 and the inner layer sheet 56 (inner square sheet). As a result, after the pulling of the close-fitting waste tape starts, the rapid increase in the pulling load can be further suppressed, and the damage of the outer surface 5A or the outer layer sheet constituting the outer surface 5A caused by the provision of the buffer structure can be more reliably prevented.

[0090] In the first region R1 of the diaper 1, as shown in FIG. Figure 6 As shown in (a), a plurality of weakly bonded portions arranged at intervals in the longitudinal direction X1 of the fixing portion 12 are bonded between the outer layer sheet 55 and the inner layer sheet 56 (inner square sheet) in the gap forming structure in the first region R1.

[0091] In each of the multiple weak joining portions, the outer layer sheet 55 and the inner layer sheet 56 may be joined in a direct contact state via an adhesive applied on one or both of the outer layer sheet 55 and the inner layer sheet 56, or the outer layer sheet 55 and the inner layer sheet 56 may be joined only by an adhesive applied around the elastic component 54.

[0092] When the outer layer sheet 55 and the inner layer sheet 56 (inner square sheet) are joined by a weak joint portion intermittently arranged in the length direction X1 of the fixing portion 12, the gap between the outer layer sheet 55 and the inner layer sheet 56 increases intermittently by pulling the discarded tape 10, so that the user can easily recognize that the extension portion begins to extend by touch of the hand.

[0093] In addition, the outer layer sheet 55 and the inner layer sheet 56 are joined only by the adhesive applied around the elastic component 54 to form a weak joint, which is also preferred from the viewpoint of providing a clear difference between the bonding strength of the outer layer sheet 55 and the inner layer sheet 56 in the first region R1 and the bonding strength of the outer layer sheet 55 and the inner layer sheet 56 in the second region R2.

[0094] exist Figure 6 In the embodiment shown, there is a region R4 where the outer layer sheet 55 and the inner layer sheet 56 (inner square sheet) are not joined between the joint portion where the outer layer sheet 55 and the inner layer sheet 56 (inner square sheet) are joined in the gap forming structure of the first region R1, and the joint portion 59 where the outer layer sheet 55 and the inner layer sheet 56 (inner square sheet) are joined in the second region R2. The presence of this region R4 makes it easy for the user to recognize that the elongation portion begins to elongate by the touch of the hand. From this point of view, in the longitudinal direction X1 of the fixing portion 12, when the joint portion of the first region R1 is composed of a plurality of weak joint portions arranged intermittently, the length L2 of the region R4 in the longitudinal direction X1 is preferably 3% or more of the total length L of the fixing portion 12 in the longitudinal direction X1, and more preferably 10% or more. It is also preferably 50% or less, more preferably 20% or less, and it is also preferably 3% or more and 50% or less, and more preferably 10% or more and 20% or less.

[0095] From the same point of view, the length L2 of the above-mentioned area R4 is preferably greater than 2 mm, more preferably greater than 5 mm, and preferably less than 30 mm, more preferably less than 10 mm, and preferably greater than 2 mm and less than 30 mm, more preferably greater than 5 mm and less than 10 mm.

[0096] When the outer sheet 55 and the inner sheet 56 (inner square sheet) are bonded only by the bonding agent applied around the elastic member 54 to form a weak bond, when a gap is generated between the outer sheet 55 and the inner sheet 56 (inner square sheet), it is preferred that the outer sheet 55 and the elastic member 54 or the elastic member 54 and the inner sheet 56 (inner square sheet) are peeled off. From the same point of view, it is more preferred that the elastic member 54 and the outer sheet 55 are peeled off. The elastic member 54 is preferably arranged in an extended state in a direction intersecting the longitudinal direction X1 of the fixing portion 12.

[0097] In the portion existing in the gap forming structure, the elastic component 54 is configured in an extended state in a direction intersecting with the length direction X1 of the fixed portion 12, that is, in a natural state, it is configured in a contracted state accompanied by wrinkles of the outer layer sheet 55 and / or the inner layer sheet 56 (inner square sheet). Therefore, at the initial stage of pulling the waste tape 10, not only the gap forming structure is deformed, but also the elastic component 54 is deformed from the contracted state to the extended state. This can suppress the rapid increase in the pulling force of the waste tape 10 at the initial stage of pulling, thereby further preventing the waste tape 10 from breaking in the extended portion.

[0098] In addition, when the elastic member 54 and the outer layer sheet 55 are peeled off, the inner layer sheet 56 (inner square sheet) shrinks in the direction intersecting the length direction X1 of the fixing portion 12 compared to the outer layer sheet 55 in the portion where the gap forming structure exists, thereby making it easy to show / maintain the gap forming structure. In addition, the reason why the peeling between the elastic member 54 and the outer layer sheet 55 is more preferred than the peeling between the elastic member 54 and the inner layer sheet 56 (inner square sheet) is that: when the peeling between the elastic member 54 and the inner layer sheet 56 (inner square sheet) occurs and the elastic member 54 is bonded to the outer layer sheet 55 side, the outer layer sheet 55 is difficult to shrink due to the rigidity of the waste tape 10 bonded to the opposite side, which is inferior from the viewpoint of making the gap forming structure easy to show / maintain.

[0099] In the diaper of the present invention, it is not necessary that the fixing portion 18 can be extended in the length direction X1 of the discarding tape. However, it is also preferred that the fixing portion 18 has a fixing portion extension portion that can be extended in the length direction X1 of the discarding tape, and the pulling strength of the fixing portion extension portion at the beginning of extension is higher than the pulling strength of the extension portion 15 at the beginning of extension. This is more preferred from the viewpoint of preventing the extension portion 15 from being broken due to pulling the discarding tape 10 and also preventing the discarding tape 10 from being accidentally pulled excessively and damaging the feeling of use.

[0100] The present invention has been described above based on its preferred embodiment, but the present invention is not limited to the above embodiment. For example, the first region R1 may also have a buffer structure that is deformed in a manner that the thickness of the outer layer sheet 55 constituting the outer surface 5A increases locally as the waste tape is pulled, and the outer surface 5A and the inner layer sheet 56 increase. In addition, the first region R1 and the third region R3 may also have a gap-forming structure without an elastic component 54 between the outer surface 5A of the outer layer sheet 55 and the inner layer sheet 56 (inner square sheet). In addition, it may also be that the outer surface 5A of the outer layer sheet 55 and the inner layer sheet 56 in the first region R1 are directly bonded via a patterned coating adhesive whose bonding strength is lower than that of the second region R2, for example, it may be bonded via a bonding agent with a lower gram weight than that of the second region R2, or the second region R2 may be bonded by a bonding agent applied over the entire surface, and the first region R1 may be bonded by a patterned coating adhesive. In addition, the elastic component may also be a band-shaped elastic component instead of a thread-shaped elastic component.

[0101] In the above embodiment, the discarding tape 10 is provided at the back portion B of the diaper 1, but the location where the discarding tape 10 is provided is not limited thereto, and for example, it may be provided at the ventral portion A or the crotch portion C. In the above embodiment, the discarding tape 10 is provided at the substantially central portion in the transverse direction Y of the diaper 1, but the location where the discarding tape 10 is provided is not limited thereto, and for example, it may be provided at any side region on the left or right of the diaper 1. Furthermore, in the above embodiment, the discarding tape 10 is provided in such a manner that its longitudinal direction X1 coincides with the longitudinal direction X of the diaper 1, but the direction of the discarding tape 10 is not limited thereto, and for example, the discarding tape 10 may be provided in such a manner that its longitudinal direction X1 coincides with the transverse direction Y of the diaper 1.

[0102] In addition, the shorts-type wearing article of the present invention is not limited to Figure 1 The pants-type disposable diaper of the illustrated form may have other forms as long as it is a diaper to be worn on the lower abdomen of a wearer.

[0103] The present invention further discloses the following additional notes.

[0104] <1>

[0105] A pants-type disposable diaper having a waist opening and a pair of leg openings, and having a ventral portion arranged on the ventral side of a wearer in a worn state and a dorsal portion arranged on the dorsal side, wherein:

[0106] A discard tape for maintaining the disposable diaper in a discarded state is provided on the outer surface of the main body portion of the disposable diaper.

[0107] The above-mentioned waste tape, wherein the fixing portion, the extension portion and the fixing portion fixed to the outer surface of the above-mentioned main body portion are arranged in this order along the length direction of the waste tape, and are arranged on the outer surface of the above-mentioned main body portion in a folded state,

[0108] The discarding tape in the folded state has its surfaces facing each other in the thickness direction bonded to each other so as to be releasable.

[0109] The waste tape is in an unfolded state in which the folded state is released, and the elongated portion is capable of extending in the length direction of the waste tape.

[0110] The main body portion includes an outer surface to which the fixing portion is fixed, and an inner sheet located closer to the skin than the outer sheet forming the outer surface.

[0111] The main body portion has a first area and a second area at a location overlapping with the fixing portion.

[0112] The first region is located on the connecting portion side with the extension portion in the longitudinal direction of the fixing portion, and is a region having a buffer structure that is deformed in such a manner that the distance between the outer surface and the inner square sheet increases when the discarding tape released from the folded state is pulled in a direction perpendicular to the outer surface to which the discarding tape is fixed.

[0113] The second region is located on the opposite side of the connecting portion in the longitudinal direction of the fixing portion and is a region where an increase in the distance is smaller than that in the first region.

[0114] <2>

[0115] Above <1> The shorts-type disposable diaper described in

[0116] In the longitudinal direction of the fixing portion, a length from the end portion on the extension portion side of the fixing portion to the second region is not less than 10% and not more than 90% of the entire length of the fixing portion.

[0117] <3>

[0118] Above <1> or <2> The shorts-type disposable diaper described in

[0119] The buffer structure in the first area has a gap forming structure, which generates a gap between the outer sheet and the inner sheet when the discarded tape that has been released from the folded state is pulled in a direction perpendicular to the outer surface with a force weaker than the pulling load at which the elongated portion starts to stretch. The second area does not have the gap forming structure.

[0120] <4>

[0121] Above <3> The shorts-type disposable diaper described in

[0122] In the above-mentioned gap forming structure, there is no connection between the above-mentioned outer layer sheet and the above-mentioned inner sheet, or there is a weak connection portion connecting the above-mentioned outer layer sheet and the above-mentioned inner sheet, so that when the above-mentioned outer layer sheet and the above-mentioned inner sheet are pulled with a force weaker than the above-mentioned pulling load at the beginning of the extension of the above-mentioned extension portion, the above-mentioned outer layer sheet and the above-mentioned inner sheet are peeled off.

[0123] <5>

[0124] Above <3> or <4> The shorts-type disposable diaper described in

[0125] The bonding strength between the outer layer sheet and the inner sheet in the gap forming structure is lower than the bonding strength between the outer layer sheet and the inner sheet in the second region.

[0126] <6>

[0127] Above <3> to <5> The shorts-type disposable diaper according to any one of the above,

[0128] The outer layer sheet and the inner sheet in the gap forming structure of the first region are joined by a plurality of weakly joined portions arranged at intervals in the longitudinal direction of the fixing portion.

[0129] <7>

[0130] Above <6> The shorts-type disposable diaper described in

[0131] Between the joint portion where the outer layer sheet and the inner sheet are joined in the gap forming structure and the joint portion where the outer layer sheet and the inner sheet are joined in the second region, there is an area where the outer layer sheet and the inner sheet are not joined, which is wider than the intervals between the plurality of weak joints.

[0132] <8>

[0133] Above <4> , <6> or <7> The shorts-type disposable diaper described in

[0134] The main body portion is provided with an elastic member which overlaps with the discarding tape in the folded state and extends in a direction intersecting with the longitudinal direction of the fixing portion.

[0135] In the weakly joined portion, the outer layer sheet and the inner layer sheet are joined only by the adhesive applied around the elastic member.

[0136] <9>

[0137] Above <8> The shorts-type disposable diaper described in

[0138] When a gap is generated between the outer-layer sheet and the inner sheet, separation occurs between the outer-layer sheet and the elastic member or between the elastic member and the inner sheet.

[0139] <10>

[0140] Above <9> The shorts-type disposable diaper described in

[0141] When a gap is generated between the outer layer sheet and the inner sheet, separation occurs between the elastic member and the outer layer sheet.

[0142] <11>

[0143] Above <3> to <10> The shorts-type disposable diaper according to any one of the above,

[0144] The main body portion also has the gap forming structure on the side opposite to the side having the first region and the second region across the connection portion between the fixing portion and the extension portion.

[0145] <12>

[0146] Above <1> to <11> The shorts-type disposable diaper according to any one of the above,

[0147] The fixing portion also includes a fixing portion extension portion that can be extended in the longitudinal direction of the discarding tape, and the tensile strength at which the fixing portion extension portion starts to extend is higher than the tensile strength at which the extension portion starts to extend.

[0148] <13>

[0149] Above <1> to <12> The shorts-type disposable diaper according to any one of the above,

[0150] The folded state of the discarding tape is a three-fold state in which the fixed portion, the extension portion, and the fixed portion are folded and stacked.

[0151] <14>

[0152] Above <1> to <12> The shorts-type disposable diaper according to any one of the above,

[0153] The folded state of the discarding tape is a two-fold state in which the fixing portion, the extension portion, and the fixing portion are folded at one location.

[0154] <15>

[0155] Above <1> to <14> The shorts-type disposable diaper according to any one of the above,

[0156] The inner square sheet is an inner sheet that forms the outer body of the diaper together with the outer sheet.

[0157] The bonding strength between the outer layer sheet and the inner layer sheet in the first region is 90% or less, preferably 75% or less of the bonding strength between the outer layer sheet and the inner layer sheet in the second region.

[0158] <16>

[0159] Above <15> The shorts-type disposable diaper described in

[0160] The bonding strength between the outer layer sheet and the inner layer sheet in the first region is 0% to 90%, preferably 25% to 75%, of the bonding strength between the outer layer sheet and the inner layer sheet in the second region.

[0161] <17>

[0162] Above <1> to <16> The shorts-type disposable diaper according to any one of the above,

[0163] The inner square sheet is an inner sheet that forms the outer body of the diaper together with the outer sheet.

[0164] The bonding strength between the outer layer sheet and the inner layer sheet in the second region is 110% to 200%, preferably 125% to 150%, relative to the tensile load at which the elongation portion starts to elongate.

[0165] <18>

[0166] Above <1> to <17> The shorts-type disposable diaper according to any one of the above,

[0167] The length from the connection portion of the fixing portion with the extension portion to the second region is not less than 10% and not more than 90% of the entire length of the fixing portion, and preferably not less than 25% and not more than 75%.

[0168] Possibility of Industrial Application

[0169] According to the present invention, the handling efficiency at the time of disposal can be not impaired, and the breakage of the discarding tape due to excessive elongation can be suppressed, and the breakage of the outer layer sheet can also be prevented.

Claims

1. A pants-type disposable diaper having a waist opening and a pair of leg openings, and having a ventral portion disposed on the ventral side of the wearer in a worn state and a dorsal portion disposed on the dorsal side, wherein: A discard tape for maintaining the disposable diaper in a discarded state is provided on the outer surface of the main body portion of the disposable diaper. The waste tape, wherein the fixing portion, the extension portion and the fixing portion fixed to the outer surface of the main body are arranged in this order along the length direction of the waste tape, and are arranged on the outer surface of the main body in a folded state, The discarding tape in the folded state has its surfaces facing each other in the thickness direction bonded to each other so as to be releasable. The extendable portion of the discarding tape is extendable in the longitudinal direction of the discarding tape in the unfolded state where the folded state is released. The main body portion includes an outer surface to which the fixing portion is fixed, and an inner square sheet located on the skin-facing side of the outer layer sheet forming the outer surface. The main body portion has a first area and a second area at a location overlapping with the fixing portion, The first region is located on the connecting portion side with the extension portion in the longitudinal direction of the fixing portion, and is a region having a buffer structure that is deformed in such a manner that the distance between the outer surface and the inner square sheet increases when the discarding tape that has been released from the folded state is pulled in a direction perpendicular to the outer surface to which the discarding tape is fixed. The second region is located on the opposite side of the connecting portion in the longitudinal direction of the fixing portion and is a region where the increase in the distance is smaller than that in the first region. The buffer structure in the first region has a gap forming structure, which generates a gap between the outer sheet and the inner sheet when the discarded tape that has been released from the folded state is pulled in a direction perpendicular to the outer surface with a force weaker than the pulling load at which the elongation portion starts to stretch, and the second region does not have the gap forming structure. The outer sheet and the inner sheet in the gap forming structure of the first region are bonded by a plurality of weak bonding portions arranged at intervals in the longitudinal direction of the fixing portion. Between the joint portion where the outer layer sheet and the inner sheet are joined in the gap forming structure and the joint portion where the outer layer sheet and the inner sheet are joined in the second region, there is a fourth region where the outer layer sheet and the inner sheet are not joined and the region is wider than the intervals between the plurality of weak joints.

2. The shorts-type disposable diaper according to claim 1, characterized in that: In the longitudinal direction of the fixing portion, a length from the end portion on the extension portion side of the fixing portion to the second region is not less than 10% and not more than 90% of the entire length of the fixing portion.

3. The shorts-type disposable diaper according to claim 1, characterized in that: In the gap forming structure, the outer layer sheet and the inner sheet are not joined, or have a weak joining portion in which the outer layer sheet and the inner sheet are joined in such a manner that they peel apart when pulled with a force weaker than the pulling load at which the elongation portion starts to elongate.

4. The shorts-type disposable diaper according to claim 1 or 3, characterized in that: The bonding strength between the outer layer sheet and the inner square sheet in the gap forming structure is lower than the bonding strength between the outer layer sheet and the inner square sheet in the second region.

5. The shorts-type disposable diaper according to claim 1, characterized in that: The length of the fourth region in the longitudinal direction of the fixing portion is not less than 3% and not more than 50% of the entire length L of the fixing portion in the longitudinal direction.

6. The shorts-type disposable diaper according to claim 1 or 5, characterized in that: A length of the fourth region in the longitudinal direction of the fixing portion is greater than or equal to 2 mm and less than or equal to 30 mm.

7. The shorts-type disposable diaper according to claim 3 or 5, characterized in that: The main body portion is provided with an elastic member which overlaps with the discarding tape in the folded state and extends in a direction intersecting with the longitudinal direction of the fixing portion. In the weakly joined portion, the outer-layer sheet and the inner-side sheet are joined in a state of direct contact via a bonding agent applied to one or both of the outer-layer sheet and the inner-side sheet.

8. The shorts-type disposable diaper according to claim 3 or 5, characterized in that: The main body portion is provided with an elastic member which overlaps with the discarding tape in the folded state and extends in a direction intersecting with the longitudinal direction of the fixing portion. In the weakly joined portion, the outer layer sheet and the inner square sheet are joined only by the adhesive applied around the elastic member.

9. The pants-type disposable diaper according to claim 7, characterized in that: When a gap is generated between the outer-layer sheet and the inner-side sheet, peeling occurs between the outer-layer sheet and the elastic member or between the elastic member and the inner-side sheet.

10. The pants-type disposable diaper according to claim 9, characterized in that: When a gap is generated between the outer layer sheet and the inner square sheet, separation occurs between the elastic member and the outer layer sheet.

11. The pants-type disposable diaper according to claim 9, characterized in that: When a gap is generated between the outer layer sheet and the inner square sheet, the inner square sheet contracts relative to the outer layer sheet in a direction intersecting the longitudinal direction of the fixing portion at a portion where the gap forming structure exists.

12. The underpants type disposable diaper according to any one of claims 1 to 3, characterized in that: The main body portion has a third region on the side opposite to the side having the first region and the second region, sandwiching a connection portion between the fixing portion and the extension portion, and the third region has the gap forming structure.

13. The pants-type disposable diaper according to claim 12, characterized in that: When the discarded tape that has been released from the folded state is pulled in a direction perpendicular to the outer surface with a force weaker than the pulling load at which the extension portion starts to extend, a space is formed between the outer sheet and the inner sheet whose cross-sectional shape along the length direction of the fixing portion is a triangle shape with a vertex near the connecting portion.

14. The underpants type disposable diaper according to any one of claims 1 to 3, characterized in that: The fixing portion also includes a fixing portion extension portion that can be extended in the longitudinal direction of the discarding tape, and the tensile strength at which the fixing portion extension portion starts to extend is higher than the tensile strength at which the extension portion starts to extend.

15. The underpants type disposable diaper according to any one of claims 1 to 3, characterized in that: The folded state of the discarding tape is a three-folded state in which the fixing portion, the extension portion, and the fixed portion are folded and stacked.

16. The underpants type disposable diaper according to any one of claims 1 to 3, characterized in that: The folded state of the discarding tape is a two-fold state in which the fixing portion, the extension portion, and the fixing portion are folded at one location.

17. The underpants type disposable diaper according to any one of claims 1 to 3, characterized in that: The inner square sheet is an inner sheet that forms the outer body of the diaper together with the outer sheet. The bonding strength between the outer layer sheet and the inner layer sheet in the first region is 90% or less of the bonding strength between the outer layer sheet and the inner layer sheet in the second region.

18. The pants-type disposable diaper according to claim 17, characterized in that: The bonding strength between the outer layer sheet and the inner layer sheet in the first region is 0% or more and 90% or less of the bonding strength between the outer layer sheet and the inner layer sheet in the second region.

19. The pants-type disposable diaper according to claim 18, characterized in that: The bonding strength between the outer layer sheet and the inner layer sheet in the first region is 25% or more and 75% or less of the bonding strength between the outer layer sheet and the inner layer sheet in the second region.

20. The underpants type disposable diaper according to any one of claims 1 to 3, characterized in that: The inner square sheet is an inner sheet that forms the outer body of the diaper together with the outer sheet. The bonding strength between the outer layer sheet and the inner layer sheet in the second region is 110% or more and 200% or less with respect to the tensile load at which the elongation portion starts to elongate.

21. The pants-type disposable diaper according to claim 20, characterized in that: The bonding strength between the outer layer sheet and the inner layer sheet in the second region is 125% or more and 150% or less with respect to the tensile load at which the elongation portion starts to elongate.

22. The underpants type disposable diaper according to any one of claims 1 to 3, characterized in that: The length from the connection portion of the fixing portion with the extension portion to the second region is not less than 25% and not more than 75% of the entire length of the fixing portion.

23. The pants-type disposable diaper according to claim 1 or 2, characterized in that: The first area is an area having a buffer structure. As the discarded tape that has been released from the folded state is pulled in a direction perpendicular to the outer surface to which the discarded tape is fixed, the buffer structure is deformed in such a way that the thickness of the outer layer sheet is locally increased and the distance between the outer surface and the inner sheet is increased.

24. The pants-type disposable diaper according to claim 1 or 5, characterized in that: The main body portion has a third region on the side opposite to the side having the first region and the second region, sandwiching the connection portion between the fixing portion and the extension portion, and the third region has the gap forming structure. The first region and the third region each have a space-forming structure without an elastic member between the outer layer sheet and the inner square sheet.

25. The underpants type disposable diaper according to any one of claims 1 to 3, characterized in that: The outer sheet and the inner sheet in the first region are directly bonded via a patterned coated bonding agent in which the bonding strength between the outer sheet and the inner sheet in the first region is lower than the bonding strength between the outer sheet and the inner sheet in the second region.

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