Pants-type disposable diapers

Abstract

To provide disposable pant-type diapers that prevent slipping down while walking while maintaining ease of putting on and taking off and a comfortable fit. [Solution] In the pant-type disposable diaper 1A, the outer body 3A has a pelvic region K and an abdominal elastic member 60 that is expandable in the width direction W, and a pressing sheet and a back sheet that sandwich the abdominal elastic member and have a lower expansion rate than the abdominal elastic member. The adhesive pattern 61 that adheres the abdominal elastic member to the pressing sheet and back sheet has a first adhesive pattern 62 of a predetermined area and a second adhesive pattern 63 that has a smaller area than the first adhesive pattern. The first adhesive pattern is provided in the width direction central region and dorsal region of the abdominal portion 34 and is provided closer to the leg opening 36 than the pelvic region, and the second adhesive pattern is provided in the pelvic region. The first and second adhesive patterns are arranged around the waist opening 33, and the compression in the pelvic region is set higher than the compression in the regions other than the pelvic region.

Description

Technical Field

[0001] The present invention relates to a pull-on disposable diaper. Background Art

[0002] Conventionally, pull-on disposable diapers (hereinafter referred to as "disposable pull-on diapers") comprising an absorbent member inside an outer cover that covers the abdomen and buttocks of a wearer are known (see, for example, Patent Documents 1 to 4).

[0003] Here, the disposable pull-on diaper described in Patent Document 1 has, in a waist portion surrounding the wearer's torso, a first region and a second region that expand and contract in the width direction, and a third region provided between the first region and the second region, the third region having a lower expansion / contraction rate in the width direction than the first region and the second region.

[0004] Furthermore, in the disposable pull-on diaper described in Patent Document 2, a high wearing pressure region that abuts against a region from the iliac crest to the anterior superior iliac spine of the wearer during wearing is set. In the high wearing pressure region, the pressure during wearing is set to be higher than that of both the peripheral region of the waist opening and the region on the leg opening side closer to the leg opening than the high wearing pressure region.

[0005] Furthermore, the disposable pull-on diaper described in Patent Document 3 is provided with a plurality of elastic members that form gathers along the entire circumference of the waist portion surrounding the wearer's torso, and the spacing between the elastic members becomes narrower as the elastic members are closer to the waist opening. The plurality of elastic members are also set such that their elongation rate becomes higher as the elastic members are closer to the waist opening.

[0006] Furthermore, in the paper pants described in Patent Document 4, two high-pressure regions (first high-pressure region and second high-pressure region) are provided below the waist opening, extending continuously in the width direction. On both sides of the waist portion in the width direction, the first high-pressure region is spaced apart from the second high-pressure region and positioned above the second high-pressure region. Also, in the center of the waist portion in the width direction, the rear side of the first high-pressure region is positioned above the front side of the first high-pressure region, and a portion of the first high-pressure region and a portion of the second high-pressure region overlap. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Patent No. 6169467 [Patent Document 2] Japanese Patent Publication No. 2007-44089 [Patent Document 3] Japanese Patent Application Publication No. 8-112308 [Patent Document 4] Patent No. 6503489 [Overview of the project] [Problems that the invention aims to solve]

[0008] Incidentally, with disposable diapers, if the waistband around the wearer's torso doesn't fit well, it can slip down while walking, causing the wearer's legs to get caught and hindering their movement. In particular, after urination, the weight increases and the absorbent material expands, making the waistband more prone to slipping down, making it even more difficult for the wearer to walk.

[0009] In contrast, the disposable underwear described in Patent Documents 1 to 4 prevents the underwear from slipping down by providing areas with relatively increased elasticity or relatively increased compression in a part of the waist area. However, the areas with increased elasticity or compression in the waist area are continuous around the entire circumference of the waist, surrounding the wearer's torso. As a result, these areas with increased elasticity or compression also tightly constrict relatively soft areas such as the center of the wearer's abdomen, causing the disposable underwear to dig in unnecessarily. This resulted in conventional disposable underwear being difficult to put on and take off, as well as causing a decrease in comfort.

[0010] This invention was made in view of the above-mentioned problems, and aims to provide a pant-type disposable diaper that prevents slipping down while walking while suppressing a decrease in ease of putting on and taking off and comfort of wear. [Means for solving the problem]

[0011] To achieve the above objective, the present invention provides a disposable pant-type diaper comprising: an outer body in which, when the longitudinal direction is defined as the direction extending from the ventral side of the wearer through the crotch to the dorsal side, and the width direction is defined as the direction perpendicular to the longitudinal direction, the sides in the width direction of the ventral part covering the wearer's abdomen and the sides in the width direction of the dorsal part covering the wearer's buttocks are joined together to form a waist opening and a pair of leg openings; and an absorbent member disposed inside the outer body, wherein the outer body has a pelvic region that faces the anterior superior iliac spine of the wearer when worn, and has a stretchable film that is stretchable in the width direction, and a pair of sheet materials sandwiching the stretchable film, the pair of sheet materials having a lower stretchability than the stretchable film, and the The stretchable film is positioned in a cylindrical waist area that covers the wearer's abdomen and buttocks. The adhesive pattern that bonds the stretchable film to the sheet material comprises a first adhesive pattern with a predetermined area in plan view and a second adhesive pattern with a smaller area in plan view than the first adhesive pattern. The first adhesive pattern is provided in the central and dorsal regions in the width direction of the abdominal portion and is positioned closer to the leg opening than the pelvic region. The second adhesive pattern is provided in the pelvic region. The first and second adhesive patterns are positioned around the waist opening, and the compression in the pelvic region is set higher than the compression in other regions. [Effects of the Invention]

[0012] As a result, the disposable pant-type diaper of the present invention can prevent slipping down while walking while maintaining ease of putting on and taking off and a comfortable fit. [Brief explanation of the drawing]

[0013] [Figure 1] This is an exploded view showing the pant-type disposable diaper of Example 1. [Figure 2] This is a cross-sectional view of AA in Figure 1. [Figure 3] This is a cross-sectional view of BB in Figure 1. [Figure 4] This is a plan view showing the front of the pant-type disposable diaper of Example 1. [Figure 5] It is a plan view showing the rear side of the pant-type disposable diaper of Example 1. [Figure 6] It is a table showing the measurement results of the downward displacement dimension of the outer cover during walking in the first paper pant and the second paper pant. [Figure 7] It is a cross-sectional view of essential parts showing the pant-type disposable diaper of Example 2. [Figure 8] It is a plan view showing the front side of the pant-type disposable diaper of Example 2. [Figure 9] It is a plan view showing the rear side of the pant-type disposable diaper of Example 2. [Figure 10] It is a cross-sectional view of essential parts showing the pant-type disposable diaper of Example 3. [Figure 11] It is a plan view showing the front side of the pant-type disposable diaper of Example 3. DETAILED DESCRIPTION OF THE INVENTION

[0014] A mode for carrying out the pant-type disposable diaper of the present invention will be described based on Examples 1 to 3 shown in the drawings. In the present specification, the direction from the wearer M's ventral side through the crotch portion toward the dorsal side, that is, the direction corresponding to the front-rear direction of the wearer M is defined as the longitudinal direction L. The direction orthogonal to the longitudinal direction L is defined as the width direction W. Furthermore, in the present specification, terms such as "up-down", "left-right", "front-rear" are used with reference to the wearer M.

[0015] (Example 1) The pant-type disposable diaper of Example 1 (hereinafter referred to as "paper pant 1") is used for absorbing body fluids such as urine of the wearer M. As shown in FIGS. 1 to 5, the paper pant 1 includes an absorbent member 2, an outer cover 3, and a hook tape 4.

[0016] As shown in Figure 2, the absorbent member 2 has a structure in which an absorbent material 23 is interposed between the top sheet 21 and the liquid-impermeable sheet 22, and the absorbent material 23 absorbs and retains bodily fluids that have permeated through the top sheet 21. The planar shape of the absorbent member 2 is not particularly limited, but it is generally approximately rectangular as shown in Figure 1.

[0017] The top sheet 21 is a sheet material that comes into contact with the wearer M's skin when the disposable pants 1 are worn. The top sheet 21 is made of a permeable sheet material that allows bodily fluids to pass through, and can be made of perforated or non-perforated nonwoven fabric or a perforated plastic sheet, for example. In Example 1, as shown in Figure 2, the top sheet 21 wraps around the side edge of the absorbent body 23 and extends to the back side of the absorbent body 23.

[0018] The liquid-impermeable sheet 22 is a sheet material fixed to the outer casing 3. The liquid-impermeable sheet 22 is made of a sheet material that is impermeable to bodily fluids and can be made of, for example, a liquid-impermeable plastic sheet such as polypropylene or a nonwoven fabric. In Example 1, as shown in Figure 2, the liquid-impermeable sheet 22 is folded back (to the non-skin side) on both sides in the width direction W of the absorbent body 23 together with the top sheet 21, but the structure is not limited to this, and other known structures can be adopted.

[0019] The absorbent body 23 is formed from a material capable of absorbing and retaining bodily fluids, such as a pulp fiber stack, a filament aggregate of cellulose acetate, or a nonwoven fabric. The absorbent body 23 may be made by mixing or fixing a superabsorbent polymer as needed. The absorbent body 23 may also contain superabsorbent polymer fibers, or polymer particles other than superabsorbent polymer particles. Furthermore, the absorbent body 23 may also contain inorganic particles other than superabsorbent polymer particles.

[0020] The absorbent material 23 is then packaged in a packaging sheet 24 having liquid permeability and liquid retention properties, such as crepe paper, to maintain its shape and polymer content. As the packaging sheet 24, tissue paper, especially crepe paper, nonwoven fabric, poly-laminated nonwoven fabric, or a sheet with small holes can be used.

[0021] Furthermore, three-dimensional gathers 25 are provided on both sides of the absorbent member 2 in the width direction W. The three-dimensional gathers 25 have a two-layer structure formed by folding the sheet material. The three-dimensional gathers 25 have a gather fixing part 25a sandwiched between the absorbent member 2 and the outer body 3, upright parts 25b that stand up from both sides of the absorbent member 2 in the width direction W, and a gather elastic member 25c provided on the upright part 25b. The gather elastic member 25c is a thread-like elastic material extending in the longitudinal direction L. The contraction force of the gather elastic member 25c causes the upright parts 25b to stand up toward the wearer M. The three-dimensional gathers 25 then come into contact with the wearer M from the groin area through the legs to the buttocks, preventing leakage of bodily fluids (so-called lateral leakage) between the wearer M and the paper pants 1.

[0022] In the unfolded state shown in Figure 1, the outer casing 3 is a strip-shaped structure extending in the longitudinal direction L, with a front region A1 and a rear region A2 at both ends of the longitudinal direction L, and a narrower constricted region A3 in the middle of the longitudinal direction L than the front region A1 and the rear region A2. The outer casing 3 is folded in the middle of the longitudinal direction L together with the absorbent member 2 after the back surface of the absorbent member 2 is joined to the inner surface (top surface) facing the wearer M by a bonding means such as hot melt adhesive. The outer casing 3 is then joined to the front region A1 and the rear region A2 in the width direction W by heat welding or hot melt adhesive to form a side seal portion 6 (see Figure 4), thus forming a so-called pant-type structure.

[0023] The outer garment 3, formed in the shape of pants, has a cylindrical waist portion 31 that covers the abdomen and buttocks of the wearer M, and a crotch portion 32 located below the waist portion 31, as shown in Figures 4 and 5. The waist portion 31 has a waist opening 33 at its upper end that surrounds the torso of the wearer M. The waist opening 33 is formed by the edges of the front region A1 and the rear region A2. Of the waist portion 31, the front side corresponding to the front region A1 becomes the ventral portion 34 (see Figure 4) that covers the abdomen of the wearer M, and the rear side corresponding to the rear region A2 becomes the dorsal portion 35 (see Figure 5) that covers the buttocks of the wearer M.

[0024] The outer casing 3 has a pair of pelvic regions K on both sides of the ventral portion 34 in the width direction W, which face the anterior superior iliac spine and its periphery when the wearer M is wearing the paper pants 1. The "anterior superior iliac spine" is the part of the ilium of the pelvis that protrudes the most forward. The pair of pelvic regions K are positioned symmetrically across the central region of the ventral portion 34.

[0025] Furthermore, the outer casing 3 has a pair of posterior regions H on its dorsal side 35 that face both sides and the peripheral edges of the wearer M's lumbar spinous processes when the paper pants 1 are worn. The "lumbar spinous processes" are projections that protrude posteriorly from the center of the back of the lumbar vertebrae. On both sides of the lumbar spinous processes are laterally extending parts called transverse processes, which make up a relatively flat area of ​​the back. In other words, the posterior regions H are the areas of the wearer M's back that face the flat areas.

[0026] Furthermore, the crotch area 32 corresponds to the constricted area A3 and covers the crotch of the wearer M, and has a pair of leg openings 36 on both sides in the width direction W into which the wearer M's legs are inserted. The pair of leg openings 36 are formed by the edges of the constricted area A3.

[0027] As shown in Figures 2 and 3, the outer casing 3 has a two-layer structure consisting of a retaining sheet 41 and a back sheet 42 (a pair of sheet materials). Between the retaining sheet 41 and the back sheet 42, an abdominal elastic member 43 and a leg elastic member 44 are arranged. The back sheet 42 has folded-over portions 42a at both ends in the longitudinal direction L that are folded inward, and a waist elastic member 45 is arranged on the folded-over portions 42a (see Figure 3).

[0028] The pressing sheet 41 and the back sheet 42 have water-repellent properties that prevent bodily fluids from passing through, and can be made of materials such as nonwoven fabric. The back sheet 42 may be made of a sheet material that has moisture permeability without compromising liquid impermeability (waterproofing) in order to prevent stuffiness. Furthermore, the non-skin side of the back sheet 42 (the side that comes into contact with the clothing or the side facing the clothing) is covered with a sheet material 46 such as nonwoven fabric.

[0029] The abdominal elastic member 43 and the waist elastic member 45 are elongated elastic members, such as thread elastic, that extend in the width direction W and are arranged at regular intervals in the longitudinal direction L. The abdominal elastic member 43 is provided over almost the entire surface of the waist portion 31. The waist elastic member 45 is provided on the periphery of the waist opening 33. The abdominal elastic member 43 and the waist elastic member 45 are sandwiched between the presser sheet 41 and the back sheet 42 in an extended state with a predetermined stretching force and are bonded to the presser sheet 41 and the back sheet 42 via hot melt adhesive or the like. Then, as the abdominal elastic member 43 and the waist elastic member 45 return to their natural length by their own contraction force, gathers are formed in the waist portion 31 and the waist opening 33.

[0030] The gathers conform the waist portion 31 and waist opening 33 to the torso of the wearer M wearing the paper pants 1, preventing leakage of bodily fluids between the wearer M and the paper pants 1 (so-called back leakage or abdominal leakage). Specifically, the compression at the waist portion 31 (the pressure applied to that area when wearing the paper pants 1) is determined by the elasticity of the abdominal elastic member 43. Furthermore, the compression at the waist opening 33 is determined by the elasticity of the waist elastic member 45.

[0031] Furthermore, the boundary between the abdominal elastic member 43 and the waist elastic member 45 does not necessarily have to be clearly defined. For example, among a plurality of elongated elastic members extending in the width direction W at predetermined intervals in the longitudinal direction L on the waist portion 31, even if the number cannot be specified, some of the elastic members on the upper side (waist opening 33 side) may function as the waist elastic member 45, and the remaining elastic members may function as the abdominal elastic member 43.

[0032] The leg-around elastic member 44 is provided around the periphery of the leg-around opening 36 and is a plurality of elongated elastic members, such as elastic threads, that extend along the leg-around opening 36 and are arranged at predetermined intervals. The leg-around elastic member 44 is sandwiched between the presser sheet 41 and the back sheet 42 in an extended state with a predetermined stretching force and is bonded to the presser sheet 41 and the back sheet 42 via hot melt adhesive or the like. Then, as the leg-around elastic member 44 returns to its natural length by its own contraction force, gathers are formed in the leg-around opening 36. The gathers conform the leg-around opening 36 to the legs of the wearer M wearing the paper pants 1, preventing leakage of bodily fluids (so-called lateral leakage) between the wearer M and the paper pants 1. In other words, the compression at the leg-around opening 36 is determined by the elasticity of the leg-around elastic member 44.

[0033] Furthermore, in Example 1, as shown in Figures 1 and 3, a first cover sheet 47 and a second cover sheet 48 are provided on the inner surface of the outer casing 3, covering both ends (front end 2a and rear end 2b) of the absorbent member 2 in the longitudinal direction L. The first cover sheet 47 covers the inner surface of the waist portion 31 from the inner surface of the front folded portion 42a to the position overlapping with the front end 2a of the absorbent member 2, and extends over the entire width W. The second cover sheet 48 covers the inner surface of the waist portion 31 from the inner surface of the rear folded portion 42a to the position overlapping with the rear end 2b of the absorbent member 2, and extends over the entire width W. The first cover sheet 47 and the second cover sheet 48 are each bonded to the outer casing 3 with a hot melt adhesive. In addition, both the first cover sheet 47 and the second cover sheet 48 have water-repellent properties that prevent bodily fluids from passing through, similar to the retaining sheet 41 and the back sheet 42, and can be made of, for example, nonwoven fabric.

[0034] While attaching the first cover sheet 47 and the second cover sheet 48 separately from the exterior body 3 offers the advantage of greater freedom in material selection, it also has disadvantages such as increased materials and manufacturing processes. Therefore, the folded portion 42a, formed by folding both ends of the back sheet 42 of the exterior body 3 in the longitudinal direction L toward the inner side, can be extended to the portion that overlaps with both ends (front end 2a, rear end 2b) of the absorbent member 2 in the longitudinal direction L, thereby forming a portion equivalent to the first cover sheet 47 and the second cover sheet 48.

[0035] The hook tapes 4 are provided on both sides of the width direction W of the outer casing 3, in this case on both sides of the width direction W of the back side portion 35 of the waist portion 31. Each hook tape 4 has a tape base material 4a and a hook portion 4b. One end of the tape base material 4a in the width direction W is fixed to the outer casing 3 (back side portion 35) in an immovable manner, and the other end in the width direction W is a free end. The tape base material 4a is formed from nonwoven fabric, woven fabric, knitted fabric, resin film, stretchable material, or a laminate thereof. The tape base material 4a has a tab portion 4c that extends further in the width direction W at the other end in the width direction W, which is the free end. The hook portion 4b is provided on the surface of the tab portion 4c facing the ventral side portion 34.

[0036] The hook portion 4b is, for example, a hook tape of a hook-and-loop fastener, and is a member that detachably engages with the non-skin side of the back sheet 42, which is covered with a sheet material 46 such as a nonwoven fabric. That is, the hook tape 4 detachably engages with the non-skin side of the ventral portion 34 via the hook portion 4b.

[0037] Furthermore, on the non-skin side of the ventral portion 34, markers 7 indicating the engagement position of the hook tape 4 are provided on both sides in the width direction W. The markers 7 are provided by coloring or otherwise applying a color to the sheet material 46 that covers the non-skin side of the ventral portion 34. Here, the markers 7 are provided at a position where the length from the position where the hook tape 4 is fixed to the outer casing 3 to the marker 7 is longer than the length from the position where the hook tape 4 is fixed to the outer casing 3 to the hook portion 4b.

[0038] Furthermore, in the paper pants 1 of Example 1, when the paper pants 1 are worn, the length from the fixing position of the hook tape 4 to the mark 7 is shortened to the length from the fixing position of the hook tape 4 to the length from the fixing position of the hook tape 4 to the hook portion 4b, thereby narrowing the circumference of both sides of the ventral portion 34 in the width direction W. At this time, the central region of the ventral portion 34 is not tightened by the hook tape 4, and its circumference is not narrowed. As a result, the paper pants 1 of Example 1 can be set so that the compression in the pelvic region K is higher than the compression in the areas of the ventral portion 34 other than the pelvic region K and the compression in the dorsal portion 35. In other words, the compression of the waist portion 31, which is determined by the elastic force of the abdominal elastic member 43, is locally increased in the pelvic region K by engaging the hook portion 4b of the hook tape 4 with the mark 7.

[0039] Furthermore, the compression in the pelvic region K should be set to be at least 1.3 times the compression in the back region H when the water absorption amount of the absorbent material 2 is 100cc. In particular, it is desirable that the compression in the pelvic region K be set to be at least 2.1 times the compression in the back region H when the water absorption amount of the absorbent material 2 is zerocc.

[0040] In other words, in the paper pants 1 of Example 1, for example, when the amount of water absorbed by the absorbent material 2 is zero cc, the compression in the pelvic region K is set to 1.37 N (Newtons), and the compression in the back region H is set to 0.65 N. As a result, in the paper pants 1 of Example 1, when the amount of water absorbed by the absorbent material 2 is zero cc, the compression in the pelvic region K is set to 2.1 times (1.3 times or more) the compression in the back region H.

[0041] Furthermore, the paper pants 1 of Example 1 are set such that, for example, when the absorbent material 2 absorbs 100cc, the compression in the pelvic region K becomes 1.31N and the compression in the back region H becomes 1.02N. This makes it possible to set the paper pants 1 of Example 1 so that when the absorbent material 2 absorbs 100cc, the compression in the pelvic region K is 1.3 times the compression in the back region H.

[0042] Here, compression is measured by placing a 6-axis force sensor between the paper pants 1 and the pelvic region K or posterior region H. The 6-axis force sensor is a sensor that shows the magnitude and direction of force and torque (moment) as a three-dimensional spatial vector. A commercially available 6-axis force sensor can be used, and here a 6-axis force sensor manufactured by Leptrino Co., Ltd. was used.

[0043] Next, the function of the paper pants 1 of Example 1 will be explained.

[0044] To wear the paper pants 1 of Example 1, the wearer M or caregiver inserts both of the wearer M's legs into the leg openings 36 and pulls up the outer body 3 by holding the waist opening 33. At this time, one end of the hook tape 4a in the width direction W is fixed to the outer body 3, but the hook portion 4b is not engaged with the outer body 3. Therefore, the hook tape 4 does not affect the compression at the waist portion 31, and the compression at the waist portion 31 is determined by the elastic force of the abdominal elastic member 43.

[0045] After the outer garment 3 is put on the wearer M, the wearer M or caregiver then engages the hook portion 4b of the hook tape 4 with the mark 7 provided on the non-skin side of the back sheet 42. As a result, the waist portion 31 is constrained by the length of the hook tape 4 on both sides in the width direction W, and is tightened compared to when the hook portion 4b is not engaged. Therefore, the compression of the outer garment 3 in the pelvic region K is higher than the compression in the areas of the ventral portion 34 other than the pelvic region K and the compression in the dorsal portion 35.

[0046] Thus, in the paper pants 1 of Example 1, by engaging the hook tape 4 with the back sheet 42 of the outer body 3, the outer body 3 can be locally pressed against the wearer M at the position of the anterior superior iliac spine, which is the part of the ilium of the pelvis that protrudes the most forward. As a result, the paper pants 1 of Example 1 can improve the fit of the waist portion 31 and prevent the outer body 3 from slipping down while walking.

[0047] Furthermore, in the paper pants 1 of Example 1, the compression is high in the pelvic region K opposite the anterior superior iliac spine, while the compression in areas of the ventral portion 34 other than the pelvic region K and in the dorsal portion 35 is set lower than the compression in the pelvic region K. In other words, in the paper pants 1 of Example 1, there is no continuous area of ​​relatively high compression in the waist portion 31 around the entire circumference of the wearer M's torso. As a result, the paper pants 1 of Example 1 do not have high compression in areas opposite to relatively soft parts such as the center of the wearer M's abdomen, and the center of the abdomen is not tightly constricted. As a result, the paper pants 1 of Example 1 do not cause unnecessary digging in, are easy to put on and take off, and can suppress a decrease in wearing comfort.

[0048] Furthermore, the paper pants 1 of Example 1 have a back region H on the back side portion 35 of the outer casing 3 that faces both sides of the lumbar spinous processes of the wearer M when the paper pants 1 are worn. The compression in the pelvic region K of the paper pants 1 should be set to 1.3 times or more the compression in the back region H when the water absorption amount of the absorbent material 2 is 100 cc (in particular, when the water absorption amount of the absorbent material 2 is zero cc, the compression in the pelvic region K should be approximately 2.1 times or more the compression in the back region H).

[0049] To verify the effect of preventing the outer casing from slipping down in disposable pull-up diapers, we measured the amount of slippage of the outer casing when walking while wearing the first type of disposable pull-up diaper and the amount of slippage of the outer casing when walking while wearing the second type of disposable pull-up diaper.

[0050] The measurement of the slip-down dimension was performed after four male and four female subjects walked for two minutes at a predetermined walking speed (3 km / h for men and 2.5 km / h for women). Furthermore, the first type of paper underwear was designed so that when the absorbent material absorbed zero cc, the compression in the pelvic region K opposite the wearer's anterior superior iliac spine was 2.1 times that of the region other than the pelvic region (posterior region H), and when the absorbent material absorbed 100 cc, the compression in the pelvic region K was 1.3 times that of the posterior region H. Furthermore, the second type of disposable underwear is designed so that the compression in the pelvic region K, which is opposite the wearer's anterior superior iliac spine, and the compression in the region outside the pelvic region (posterior region H) are approximately the same (when the absorbent material absorbs zero cc, the compression in the pelvic region K is 1.2 times that of the posterior region H; when the absorbent material absorbs 100 cc, the compression in the pelvic region K is 1.0 times that of the posterior region H). In addition, since the slip-down dimension changes depending on the amount of water absorbed by the absorbent material 2, the slip-down dimension was measured here when the absorbent material 2 absorbed zero cc, 100 cc, and 200 cc, and the average value was calculated. The measurement results for the slip-down dimension are shown in Figure 6.

[0051] As shown in Figure 6, when walking while wearing the first disposable diaper 1, the amount of slippage of the outer casing was 0.7 mm when the amount of absorbed water was zero cc, 1.5 mm when the amount of absorbed water was 100 cc, and an average of 1.3 mm. In contrast, when walking while wearing the second disposable diaper, the amount of slippage of the outer casing was 1.9 mm when the amount of absorbed water was zero cc, 5.3 mm when the amount of absorbed water was 100 cc, and an average of 4.4 mm.

[0052] Thus, in the first type of disposable underwear, when the absorbent material absorbs 100cc, the compression in the pelvic region K is set to 1.3 times the compression in the back region H. As a result, when the absorbent material absorbs zerocc, the slip-down dimension is reduced to 0.7mm (suppression dimension 1.2mm), compared to 1.9mm in the second type of disposable underwear. Furthermore, it was found that when the absorbent material absorbs 100cc, the first type of disposable underwear can reduce the slip-down dimension to 1.5mm (suppression dimension 3.8mm), compared to 5.3mm in the second type of disposable underwear.

[0053] From these verification results, it was found that the paper pants 1 of Example 1 can suppress the slippage of the outer body 3 during walking by setting the compression in the pelvic region K to at least 1.3 times the compression in the back region H when the water absorption amount of the absorbent material 2 is at least 100cc. In this case, the paper pants 1 of Example 1 can maintain the pelvic region K at the position of the anterior superior iliac spine, allowing the paper pants 1 to be properly fitted.

[0054] Furthermore, in the first disposable underwear, when the absorbent material 2 absorbed 100cc, the compression in the pelvic region K was set to 1.3 times the compression in the back region H. As a result, even when the absorbent material absorbed 200cc, the first disposable underwear significantly suppressed the slippage of the outer garment compared to the second disposable underwear (the amount of slippage suppression was 4.2mm). Therefore, in the disposable underwear 1 of Example 1, when the absorbent material 2 absorbed 100cc, the compression in the pelvic region K was set to 1.3 times or more the compression in the back region H. Even when the absorbent material 2 absorbed a large amount of moisture (200cc), the slippage of the outer garment 3 could be appropriately prevented without worsening the wearing comfort.

[0055] Furthermore, in the first paper pants, the compression in the pelvic region K is set to be 2.1 times the compression in the back region H when the absorbent material absorbs zero cc. As a result, in the paper pants 1 of Example 1, by setting the compression in the pelvic region K to be 2.1 times or more the compression in the back region H when the absorbent material 2 absorbs zero cc, it becomes possible to make the compression in the pelvic region K 1.3 times or more the compression in the back region H when the absorbent material 2 absorbs 100 cc. In addition, as shown in Figure 6, the first paper pants hardly cause the outer body 3 to slip down when the absorbent material 2 absorbs zero cc. Therefore, even in the paper pants 1 of Example 1, if the compression in the pelvic region K is set to be 2.1 times or more the compression in the back region H when the absorbent material 2 absorbs zero cc, the fixation of the outer body 3 in the pelvic region K can be improved, and the slip-down of the outer body 3 can be further suppressed.

[0056] Furthermore, the paper pants 1 of Embodiment 1 are provided with hook tapes 4 on both sides in the width direction W of the outer body 3, which are detachably engaged with the non-skin side of the abdominal portion 34. Markers 7 indicating the engagement positions of the hook tapes 4 are provided on both sides in the width direction W of the abdominal portion 34.

[0057] As a result, in the paper pants 1 of Example 1, the wearer M or caregiver can use the markings 7 as a guide to engage the hook tape 4 with the outer body 3, thereby tightening both sides of the waist portion 31 in the width direction W with the hook tape 4 and appropriately increasing the compression in the pelvic region K. Furthermore, the paper pants 1 of Example 1 can prevent the paper pants 1 from slipping down while walking and suppress deterioration of wearing comfort.

[0058] Furthermore, when the wearer M removes the paper pants 1 in the toilet or elsewhere, or when the tightening by the hook tape 4 is released, or when tightening of the waist portion 31 is not necessary, the wearer M or caregiver may engage the hook portion 4b at any position on the abdominal portion 34 where it is not tightened by the hook tape 4.

[0059] (Example 2) The disposable pant-type diaper of Example 2 (hereinafter referred to as "paper pant 1A") has an abdominal elastic member 60 positioned at the waist portion 31, which is made of an expandable film that can expand and contract in the width direction W. Note that the paper pant 1A of Example 2 does not have a hook tape 4.

[0060] In other words, the outer casing 3A of the paper pants 1A in Example 2, as shown in Figure 7, has a two-layer structure consisting of a pressing sheet 41 and a back sheet 42 (a pair of sheet materials), similar to the outer casing 3 of the paper pants 1 in Example 1. In the paper pants 1A of Example 2, an abdominal elastic member 60 and a leg elastic member 44 (see Figures 8 and 9) are arranged between the pressing sheet 41 and the back sheet 42. The back sheet 42 has folded-over portions 42a at both ends in the longitudinal direction L, which are folded inward, similar to Example 1, and a waist elastic member 45 is arranged on the folded-over portions 42a.

[0061] The abdominal elastic member 60 in Example 2 is a stretchable film that can stretch in the width direction W, and can be made of a sheet material such as polyurethane or polyolefin elastomer. The abdominal elastic member 60, made of stretchable film, is positioned over almost the entire surface of the waist portion 31, that is, the entire area of ​​the ventral portion 34 and the dorsal portion 35. The abdominal elastic member 60 is sandwiched between the presser sheet 41 and the back sheet 42 in a state stretched with a predetermined stretching force, and is bonded to the presser sheet 41 and the back sheet 42 via an adhesive such as ultrasonic bonding or hot melt adhesive. Then, as the abdominal elastic member 60 returns to its natural length by its own contraction force, gathers are formed in the waist portion 31. In other words, the compression in the waist portion 31 is determined by the stretching force of the abdominal elastic member 60.

[0062] Furthermore, in the paper pants 1A of Example 2, as shown in Figures 8 and 9, multiple adhesive patterns 61 (areas where adhesive is applied) that bond the abdominal elastic member 60 to the press sheet 41 and back sheet 42 (a pair of sheet materials) are provided, distributed almost evenly throughout the entire waist portion 31, and each adhesive pattern 61 exhibits a circular shape when the paper pants 1A is viewed from above.

[0063] Furthermore, as shown in Figure 8, the area of ​​the adhesive pattern 61 in plan view is smaller around the waist opening 33 than around the leg opening 36. In other words, the area of ​​the adhesive pattern 61 around the waist opening 33 is smaller than the area of ​​the adhesive pattern 61 around the leg opening 36.

[0064] Furthermore, as shown in Figures 8 and 9, the area of ​​the adhesive pattern 61 in plan view is smaller for the one provided in the pelvic region K than for the one provided in the central region of the ventral region 34 and the dorsal region 35. In other words, the area of ​​the adhesive pattern 61 provided in the pelvic region K is smaller than the area of ​​the adhesive pattern 61 provided in the central region of the ventral region 34 and the dorsal region 35.

[0065] In the paper pants 1A of Example 2, the adhesive pattern 61 has a predetermined first adhesive pattern 62 with a planar area and a second adhesive pattern 63 with a planar area smaller than the first adhesive pattern 62. The first adhesive pattern 62 is provided in the central region of the ventral portion 34 and the dorsal portion 35, and the second adhesive pattern 63 is provided in the pelvic region K. Furthermore, the first adhesive pattern 62 is positioned closer to the leg opening 36 than the second adhesive pattern 63.

[0066] The area of ​​the first adhesive pattern 62 is 0.5 mm². 2 ~1.5mm 2 The area of ​​the second adhesive pattern 63 is set to approximately 0.2 mm². 2 ~0.5mm 2 It is desirable to set the spacing to a certain extent. Furthermore, it is desirable to set the spacing between adjacent first adhesive patterns 62 to approximately 1 mm to 3 mm, and the spacing between adjacent second adhesive patterns to approximately 3 mm to 8 mm.

[0067] Here, the pressing sheet 41 and back sheet 42 have a lower elasticity than the abdominal elastic member 60 and hardly stretch at all. The adhesive pattern 61 then fixes the abdominal elastic member 60, which is made of stretchable film, to the pressing sheet 41 and back sheet 42, which hardly stretch at all. Therefore, at the position where the adhesive pattern 61 is provided, the elasticity of the abdominal elastic member 60 is suppressed by the pressing sheet 41 and back sheet 42. Furthermore, the more the elasticity of the abdominal elastic member 60 is suppressed and the less elastic it is, the lower the compression on the waist area 31 becomes.

[0068] In contrast, in the paper pants 1A of Example 2, the area of ​​the adhesive pattern 61 provided around the waist opening 33 is smaller than the area of ​​the adhesive pattern 61 provided around the leg opening 36. Therefore, the abdominal elastic member 60 has higher elasticity in the area around the waist opening 33 than in the area around the leg opening 36. As a result, the paper pants 1A of Example 2 can apply higher compression to the outer body 3A around the waist opening 33 than around the leg opening 36.

[0069] Furthermore, in the paper pants 1A of Example 1, the area of ​​the adhesive pattern 61 provided in the pelvic region K is smaller than the area of ​​the adhesive pattern 61 provided in the central region of the ventral portion 34 and the dorsal portion 35. As a result, the elasticity of the waist portion 31 is locally increased in the pelvic region K. Therefore, in the paper pants 1A of Example 2, the compression of the outer body 3A in the pelvic region K can be made higher than the compression of the outer body 3A in the central region of the ventral portion 34 and the dorsal portion 35.

[0070] Thus, the paper pants 1A of Example 2 can partially (locally) increase the compression of the waist area 31, and the compression of the outer body 3A in the pelvic region K can be set higher than the compression of the outer body 3A in areas other than the pelvic region K. For this reason, the paper pants 1A of Example 2 can prevent the outer body 3A from slipping down while walking and suppress a decrease in wearing comfort.

[0071] (Example 3) The disposable pant-type diaper of Example 3 (hereinafter referred to as "paper pant 1B") has an abdominal elastic member 70 positioned at the waist portion 31, which is made of an expandable film that can stretch in the width direction W, and is locally made of two or more layers in the pelvic region K. Note that the paper pant 1B of Example 3 does not have a hook tape 4.

[0072] In other words, the outer casing 3B of the paper pants 1B in Example 3, as shown in Figure 10, has a two-layer structure consisting of a pressing sheet 41 and a back sheet 42 (a pair of sheet materials), similar to the outer casing 3 of the paper pants 1 in Example 1 and the outer casing 3A of the paper pants 1A in Example 2. An abdominal elastic member 70 and a leg elastic member 44 (see Figure 11) are arranged between the pressing sheet 41 and the back sheet 42. The back sheet 42 has folded-over portions 42a at both ends in the longitudinal direction L, which are folded inward, similar to Examples 1 and 2, and a waist elastic member 45 is arranged on the folded-over portions 42a.

[0073] The abdominal elastic member 70 of Example 3 is a stretchable film that can be stretched in the width direction W, and can be made of a sheet material such as polyurethane or polyolefin elastomer. The abdominal elastic member 70 of Example 3 also has a first stretchable film 71 having a predetermined stretch ratio and a second stretchable film 72 having a higher stretch ratio than the first stretchable film 71 (see Figure 11). It is desirable that the stretch ratio of the first stretchable film 71 be about 140% to 160%, and the stretch ratio of the second stretchable film 72 be about 160% to 190%.

[0074] As shown in Figure 11, the first stretchable film 71 is positioned over almost the entire surface of the waist portion 31, i.e., the entire area of ​​the ventral portion 34 and the dorsal portion 35. The first stretchable film 71 is sandwiched between the presser sheet 41 and the back sheet 42 while stretched with a predetermined stretching force, and is bonded to the presser sheet 41 and the back sheet 42 via an adhesive such as ultrasonic bonding or hot melt adhesive. Then, as the first stretchable film 71 returns to its natural length by its own contraction force, gathers are formed in the waist portion 31.

[0075] As shown in Figure 11, the second stretchable film 72 is positioned in the pelvic region K of the ventral portion 34 of the waist portion 31 and is laminated on the first stretchable film 71. The second stretchable film 72 is fixed to the first stretchable film 71 with an adhesive or the like. As a result, in the paper pants 1B of Example 3, the first stretchable film 71 and the second stretchable film 72 are laminated in the pelvic region K, resulting in two layers of stretchable film constituting the abdominal elastic member 70. In addition, in areas of the waist portion 31 other than the pelvic region K (the central region of the ventral portion 34 and the dorsal portion 35), only the first stretchable film 71 is positioned, resulting in a single layer of stretchable film constituting the abdominal elastic member 70.

[0076] Thus, in the paper pants 1B of Example 3, the outer body 3B has an abdominal elastic member 70 made of an expandable film that can expand and contract in the width direction W. In the pelvic region K, the abdominal elastic member 70 is made up of two layers by laminating a first expandable film 71 and a second expandable film 72, while in the waist portion 31 outside the pelvic region K, only the first expandable film 71 is arranged, making it a single layer. Here, the more expandable films the abdominal elastic member 70 is made of, the higher its elasticity.

[0077] Therefore, in the pelvic region K, where the first stretchable film 71 and the second stretchable film 72 are laminated to form a two-layer structure, the elasticity of the abdominal elastic member 70 is higher than in areas other than the pelvic region K. As a result, the paper pants 1B of Example 3 can achieve higher compression in the pelvic region K than in areas other than the pelvic region K, such as the central area of ​​the ventral portion 34 and the dorsal portion 35.

[0078] Thus, the paper pants 1B of Example 3 can partially (locally) increase the compression of the waist area 31, and the compression of the outer body 3B in the pelvic region K can be set higher than the compression of the outer body 3B in areas other than the pelvic region K. For this reason, the paper pants 1B of Example 3 can prevent the outer body 3B from slipping down while walking and suppress a decrease in wearing comfort.

[0079] Furthermore, in the paper pants 1B of Example 3, the abdominal elastic member 70 made of stretchable film has a first stretchable film 71 with a predetermined stretch ratio and a second stretchable film 72 with a higher stretch ratio than the first stretchable film 71. In the pelvic region K, the first stretchable film 71 and the second stretchable film 72 with a higher stretch ratio are laminated together. In other words, in Example 3, the second stretchable film 72 with a higher stretch ratio is added to the first stretchable film 71 in the pelvic region K.

[0080] As a result, the paper pants 1B of Example 3 can partially (locally) increase the compression in the pelvic region K with a simple structure. Furthermore, by adding a second stretchable film 72 with a higher stretchability than the first stretchable film 71 in the pelvic region K of the paper pants 1B of Example 3, the stretchability of the abdominal elastic member 70 in the pelvic region K can be made higher than, for example, the stretchability of the abdominal elastic member 70 when two layers of the first stretchable film 71 are stacked in the pelvic region K. Thus, the paper pants 1B of Example 3 can increase the compression in the pelvic region K compared to when two layers of the first stretchable film 71 are stacked, and can further suppress the slippage of the outer garment 3B during walking.

[0081] The disposable pant-type diapers of the present invention have been described above based on Examples 1 to 3. However, the specific configuration is not limited to these examples, and changes or additions to the design are permitted as long as they do not deviate from the gist of the invention as described in each claim.

[0082] In the paper pants 1A of Example 2, an example was shown in which the adhesive pattern 61 that adheres the abdominal elastic member 60 to the press sheet 41 and back sheet 42 has a first adhesive pattern 62 of a predetermined area and a second adhesive pattern 63 with a smaller area than the first adhesive pattern 62. However, the area of ​​the adhesive pattern 61 in plan view should be smaller around the waist opening 33 than around the leg opening 36, and smaller in the pelvic region K than in the central region of the abdominal portion 34 and the dorsal portion 35. For example, an adhesive pattern 61 may be provided in which the area gradually decreases from the leg opening 36 toward the waist opening 33, or an adhesive pattern 61 may be provided in which the area in plan view increases as it moves away from the pelvic region K.

[0083] Furthermore, although an example was shown in which the adhesive pattern 61 is distributed almost evenly across the entire waist portion 31, the position where the adhesive pattern 61 is provided can be set arbitrarily. For example, the spacing of the adhesive pattern 61 may be widened in the pelvic region K and its surrounding areas. In addition, the area and shape of the adhesive pattern 61 in plan view can be arbitrarily set according to the material, size, and shape of the outer body 3A, the size of the area of ​​the adhesive pattern 61, etc.

[0084] Furthermore, in the paper pants 1B of Example 3, an example was shown in which the abdominal elastic member 70 made of stretchable film was made in two layers in the pelvic region K and in one layer in the region other than the pelvic region K. However, it is sufficient for the stretchable film to be laminated into two or more layers in the pelvic region K, and for the region other than the pelvic region K to have fewer layers of stretchable film than in the pelvic region K. Therefore, the paper pants 1B may, for example, have three or more layers of stretchable film laminated in the pelvic region K, while setting the number of layers of stretchable film in the region other than the pelvic region K to two or the like.

[0085] Furthermore, in the paper pants 1B of Example 3, an example was shown in which a second stretchable film 72, which has a higher stretchability than the first stretchable film 71, was laminated to a first stretchable film 71, which has a predetermined stretchability, in the pelvic region K. However, the stretchable films laminated in the pelvic region K may be the same (first stretchable film 71). In other words, as long as the stretchability of the pelvic region K is set higher than the stretchability of the regions other than the pelvic region K, the stretchability of the laminated stretchable films and the number of layers can be set arbitrarily.

[0086] Furthermore, the expansion ratios of the first stretchable film 71 and the second stretchable film 72 can be arbitrarily set according to the material, size, shape, etc., of the outer casing 3A. [Explanation of Symbols]

[0087] 1. Paper pants (disposable diapers in the style of pants) 2 Absorbing member 3. Exterior 31 Waist area 33 Waist opening 34 Ventral part 35 Dorsal part 36 Leg opening 4 Hook and Tape 7 Landmarks K Pelvic region L Longitudinal direction W (width direction) M wearer

Claims

1. A disposable pant-type diaper comprising: an outer body in which both sides in the width direction of the abdominal portion covering the wearer's abdomen and both sides in the width direction of the back portion covering the wearer's buttocks are joined together to form a waist opening and a pair of leg openings, and an absorbent member disposed inside the outer body, wherein the longitudinal direction is defined as the direction extending from the wearer's abdominal side through the crotch to the back, and the width direction is defined as the direction perpendicular to the longitudinal direction, and an outer body in which both sides in the width direction of the abdominal portion covering the wearer's buttocks are joined together to form a waist opening and a pair of leg openings, and an absorbent member disposed inside the outer body, The outer casing has a pelvic region that faces the wearer's anterior superior iliac spine when worn, and includes a stretchable film that is expandable in the width direction, and a pair of sheet materials that sandwich the stretchable film. The pair of sheet materials have a lower rate of expansion than the stretchable film. The stretchable film is positioned in a cylindrical waist portion that covers the wearer's abdomen and buttocks. The adhesive pattern for bonding the stretchable film and the sheet material comprises a first adhesive pattern with a predetermined area in plan view, and a second adhesive pattern with a smaller area in plan view than the first adhesive pattern. The first adhesive pattern is provided in the central region in the width direction of the ventral portion and in the dorsal portion, and is provided in a position closer to the leg opening than the pelvic region. The second adhesive pattern is provided in the pelvic region, The first adhesive pattern and the second adhesive pattern are arranged around the waist opening. The compression in the pelvic region is set higher than the compression in other regions. A pant-type disposable diaper characterized by the following features.

2. In the disposable pant-type diaper described in claim 1, The spacing between adjacent first adhesive patterns is set to be less than or equal to the spacing between adjacent second adhesive patterns. A pant-type disposable diaper characterized by the following features.

3. In the disposable pant-type diaper described in claim 1 or claim 2, The area of ​​the first adhesive pattern is 0.5 mm². ２ ~1.5mm ２ The setting is configured such that the area of ​​the second bonding pattern is 0.2 mm². ２ ~0.5mm ２ Set to A pant-type disposable diaper characterized by the following features.

4. In the disposable pant-type diaper described in claim 1 or claim 2, The aforementioned adhesive pattern exhibits a circular shape when viewed from above. A pant-type disposable diaper characterized by the following features.

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