JP4530938B2 - Pants-type disposable diaper - Google Patents

Description

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

  In a pants-type disposable diaper, an elastic member extending in the width direction of the diaper is disposed between a waist opening and a leg opening. For example, at least the ventral side of the diaper is defined between a first waist region defined by a maximum of 20 mm in each of the upper and lower sides with the front end edge of the core as a boundary, and between the first waist region and the leg opening. A pants-type disposable diaper having a second waistline area, wherein the arrangement interval dimension of the elastic members in the first waistline area is smaller than the arrangement interval dimension of the elastic members in the second waistline area. It has been proposed (see Patent Document 1). In this diaper, the first torso area is more than the second torso area in terms of adhesion to the skin while substantially equalizing the surface pressure per fixed area in the first torso area and the second torso area. By making it good, it is intended to prevent leakage without impairing the feeling of wearing the diaper.

  Also known is a pants-type disposable diaper that has a strong contraction force acting on the upper part of the wearer's torso and lumbar bone by gradually reducing the spacing between the elastic members toward the leg opening. (See Patent Document 2). However, in these diapers, the diaper is easily slipped off while the diaper is worn, and the appearance of the diaper is not good. Although it is conceivable to increase the tightening pressure at the waist opening to prevent slippage, in that case, it may be difficult to wear a diaper.

  Moreover, as a pants-type disposable diaper, a pants-type disposable diaper is known in which both side edges of the back side of the diaper and both side edges of the abdomen are connected to each other via a stretchable side panel. (Patent Document 3). However, this diaper also has a problem that the diaper is easily slipped off during wearing.

JP-A-9-66071 Japanese National Patent Publication No. 11-506653 JP 2001-321399 A

  Accordingly, it is an object of the present invention to provide a pants-type disposable diaper that can eliminate the various drawbacks of the above-described prior art.

  The present invention comprises an absorbent main body having a topsheet and an absorbent core, and an exterior body that is positioned on the non-skin contact surface side of the absorbent main body and fixes the absorbent main body, and has a waist opening In a pants-type disposable diaper in which a part and a pair of leg openings are formed, the absorbent core contains a cross-linked fiber, and a side part is provided in the vicinity of both side edges in the longitudinal direction of the absorbent core. The above-mentioned object is achieved by providing a pants-type disposable diaper in which an elastic member for startup is arranged along the longitudinal direction, and both side portions of the absorbent core are configured to stand up when the diaper is worn. is there.

  According to the pants-type disposable diaper of the present invention, it is difficult for slippage due to the wearer's movement or the like to occur, and leakage hardly occurs.

Hereinafter, the present invention will be described based on a preferred embodiment thereof with reference to the drawings.
The disposable diaper 1 of the present embodiment (hereinafter also simply referred to as diaper 1) is a so-called pants-type diaper, and as shown in FIGS. 1 to 4, a liquid-permeable top sheet 2, a liquid-impermeable back surface An absorbent main body 5 having a sheet 3 and a liquid-retaining absorbent core 4 interposed between the two sheets, and the absorbent main body 5 fixed on the non-skin contact surface side of the absorbent main body 5 The exterior body 10 is provided.
The diaper 1 is divided into an abdominal side A disposed on the wearer's abdomen, a back side B disposed on the back of the wearer, and a crotch C positioned therebetween. The ventral portion A, the dorsal portion B, and the crotch portion C are each when the diaper 1 in an unfolded state is divided into three regions so that the entire length in the longitudinal direction (vertical direction in FIG. 3) is divided into approximately three equal parts. It is an area. The unfolded state refers to a state in which portions located on the left and right side portions of the wearer are peeled or cut to expand the diaper into a flat shape (see FIG. 3).

The absorbent main body 5 has a vertically long rectangular shape, and the hot melt type adhesive 13 or the like is formed so that the longitudinal direction thereof coincides with the longitudinal direction of the diaper in the unfolded state and extends from the abdominal side A to the back side B. It is joined to the central portion in the width direction of the exterior body 10 by a known joining means.
As shown in FIG. 3, the exterior body 10 has a vertically-long rectangular main body fixing portion 11, and ventral side elastic members 12, 12 connected to both side edges of the main body fixing portion 11 in the ventral side A, It consists of dorsal side elastic members 13 and 13 connected to both side edges of the body fixing part 11 in the dorsal side B, and in the diaper-deployed state, the crotch part C is constricted as a whole. .
The exterior body 10 is bonded to the ventral side elastic member 12 and the dorsal side elastic member 13 which are located on the same side in the longitudinal direction, with a part thereof being overlapped on the side of the diaper as shown in FIG. The pair of side joints 14, the waist opening 7, and the pair of leg openings 8, 8 are formed by the joining.

The main body fixing portion 11 is made of a substantially non-stretchable sheet material. Examples of the sheet material include various nonwoven fabrics (single layer or multilayer nonwoven fabric), laminates of nonwoven fabrics and films, and laminates of nonwoven fabrics and woven fabrics. Etc. can be used.
The abdominal side elastic member 12 and the back side elastic member 13 have elasticity in at least the width direction of the diaper in the unfolded state, and materials usable for each include at least an elastomer film and at least laminated on the film. Examples thereof include a laminate composed of a single cover stock layer (woven fabric and / or nonwoven fabric), a laminate containing an elastomer scrim material, and the like. As the laminate and other materials that can be used as the ventral side elastic member 12 and the back side elastic member 13, those described in JP-A-2001-321399 can be used.

The absorbent core 4 in the diaper 1 is mainly composed of a fiber assembly including cross-linked fibers.
As the cross-linked fiber used for the absorbent core 4, individual cross-linked fibers, that is, those having chemical cross-links in the fibers (hereinafter also referred to as individual cross-linked fibers) are preferable. Examples of the types of fibers to be crosslinked include pulp and rayon, and cellulose fibers such as pulp are particularly preferable.
Absorber structures made from individualized cross-linked fibers generally exhibit higher resilience when wet and dry compared to absorbent structures made from uncross-linked fibers.

The method for producing individualized crosslinked fibers is not particularly limited, and examples thereof include methods described as a dry crosslinking method, an aqueous solution crosslinking method, and a non-aqueous solution crosslinking method described in Japanese Patent No. 3247386.
The dry cross-linking method is, for example, a method described in US Pat. No. 3,224,926, in which cellulose dry wrap is sprayed with a cross-linking agent, the fibers are disaggregated by mechanical action, and the fibers are in a substantially individual state. In this method, the fiber is dried at a high temperature to cause crosslinking, thereby obtaining a crosslinked fiber. Fibers obtained by the dry crosslinking method are generally very stiff due to cross-linking, and the absorbent structure made therefrom exhibits a relatively high elastic recovery.
The aqueous solution crosslinking method is, for example, a method described in US Pat. No. 3,241,553, and is a method for obtaining a crosslinked fiber by crosslinking fibers in an aqueous solution containing a crosslinking agent and a catalyst.
The non-aqueous crosslinking method is, for example, a method described in U.S. Pat. No. 4,035,147, in which the crosslinking agent and the catalyst are dehydrated in a substantially non-aqueous solution containing an insufficient amount of water to swell the fibers. This is a method of obtaining a crosslinked fiber by bringing it into contact with a non-swelled fiber.

  Examples of the crosslinking agent for forming intrafiber crosslinks on cellulose fibers include formaldehyde and / or formaldehyde addition products, dialdehyde crosslinking agents, and polycarboxylic acids. Examples of the crosslinking agent are described in, for example, the above-mentioned Japanese Patent No. 3247386.

  The fiber assembly used for the absorbent core 4 may be composed of individualized crosslinked fibers or may include fibers other than the individualized crosslinked fibers. The ratio of the individualized crosslinked fibers is preferably 10% or more, particularly 15 to 25%, based on the weight, with respect to the total amount of fibers in the fiber assembly.

  In addition, the fiber assembly used for the absorbent core 4 may be one that holds a highly water-absorbing polymer. In this case, examples of the existence form of the superabsorbent polymer include a form held between the fibers of the fiber assembly, a form sandwiched between layers composed of a plurality of fiber assemblies, and the like. The fiber assembly may be in the form of a web that has not been made into a non-woven fabric or in the form of a non-woven fabric.

  As shown in FIGS. 3 and 4, the absorbent core 4 in the present diaper 1 includes a central absorbent body 41 and a pair of side absorbent bodies 42 positioned on both sides of the central absorbent body 41 at least in the crotch part C of the diaper. , 42. One side in the longitudinal direction and the other side in the longitudinal direction of the side absorbent body 42 are connected to one side in the longitudinal direction and the other side in the longitudinal direction of the central absorbent body 41, respectively. Therefore, the cut-out portions 43 and 43 having a hollow shape are formed between the central absorbent body 41 and the pair of side absorbent bodies 42 and 42, respectively. The absorbent core 4 is arranged on the diaper 1 so that the side absorbent bodies 42 and 42 are located at least in the crotch part C. Each of the central absorbent body 41 and the pair of side absorbent bodies 42 and 42 in the diaper 1 of the present embodiment is mainly composed of a fiber assembly including crosslinked fibers. The absorbent core 4 is entirely covered with a water-permeable covering sheet (not shown) made of tissue paper or a water-permeable nonwoven fabric.

In the diaper 1, as shown in FIG. 4, the elastic members 9 for raising the side portions of the absorbent cores 4 are arranged in the longitudinal direction in the vicinity of the outer edges 42a and 42a of the pair of side absorbent bodies 42 and 42, respectively. It is arranged along. The elastic member 9 is disposed between both side edges of the absorbent core 4 (outer edges 42a of the side absorbent bodies 42) and the topsheet 2 that covers both side edges in the width direction of the diaper 1 in the deployed state. More specifically, in the longitudinal direction of the diaper 1, the crotch part C is cut longitudinally so as to extend between the abdominal side A and the back side B of the diaper. It is arranged so as to cover almost the entire length of the direction. The elastic member 9 is joined to the adjacent topsheet 2 in an expanded state, and when the diaper is worn, the elastic member 9 contracts, thereby causing the side absorbent bodies 42 and 42 (corresponding to both side portions of the absorbent core 4). Has been made to stand up.

  As shown in FIGS. 3 and 4, a pair of leak-proof cuffs 6 and 6 are formed on both sides of the absorbent main body 5 in the longitudinal direction of the diaper 1. The leak-proof cuff 6 is formed so as to extend in the longitudinal direction of the absorbent main body 4 and the diaper 1, respectively. The leak-proof cuff 6 includes a leak-proof cuff forming sheet 60 joined to the absorbent main body 5 or the exterior body 10 in the vicinity thereof, and a leak-proof cuff forming fixed in the vicinity of the free end 62 of the leak-proof cuff 6. The elastic member 61 is provided. The fixed end 63 of the leak-proof cuff 6 is located inward from the position of the side edge of the absorbent core 4 in the diaper width direction. And the waste holding | maintenance part P which got over the side edge part of the absorptive core 4 is formed between the non-skin contact surface of the both sides of the absorptive core 4 standing at the time of wear, and the leak-proof cuff 6. ing. The non-skin contact surfaces on both sides of the absorbent core 4 may be covered with a liquid-impermeable back sheet 3, but in the diaper 1 of the present embodiment, the side edges of the absorbent core 4 are It is covered with the top sheet 2 that is covered and folded, and is liquid permeable. Therefore, reabsorption of urine and the like accommodated and retained in the accommodating and holding portion P is possible.

  In the diaper 1, the wearing pressure at the time of wearing the diaper is set to 1.1 to 2.5 kPa between the waist opening 7 and the leg opening 8 in the stomach side A and the back side B of the diaper 1. First regions 91 and 91 are formed. As shown in FIG. 1, the first region 91 of the ventral side A and the first region 91 of the back side B are in a state where the ventral side elastic member 12 and the back side elastic member 13 are joined. It is an annular belt-like region extending over the wearer's waistline direction.

  In the diaper 1 of the present embodiment, the pressure when the diaper 1 is worn in the first region 91 is 1.1 to 2.5 kPa. The first region 91 is preferably formed at a portion that abuts a portion (hereinafter also referred to as an iliac region) from the wearer's iliac crest to the upper anterior iliac spine when the diaper 1 is worn. The iliac crest and superior anterior iliac spine are anatomical terms. The iliac crest is a part indicated by 15 in FIG. 5, and the superior anterior iliac spine is a part indicated by 16 in FIG. Conventionally, in order to prevent slipping while wearing a pants-type diaper, particularly to prevent slipping while wearing a pants-type disposable diaper for infants, tightening an elastic member disposed in the waist opening It has been considered effective to increase the pressure and bring the pant-type diaper into close contact with the wearer's body through the waist opening (for example, see Patent Document 2 described above). However, as a result of the study by the present inventors, in order to effectively prevent slippage during wearing of the pants-type diaper, it corresponds to the wearer's iliac region rather than increasing the tightening pressure of the waist opening. It has been found that it is effective to increase the tightening pressure of the diaper part as compared with the prior art. The reason for this is that wearers, particularly infants, have their waists protruding as a physical feature, so if the tightening pressure of the waist opening that abuts the protruding belly is increased, the tightening pressure is high. This is because the waist opening is gradually narrowed down and the waist opening is shifted down to a site where the abdomen becomes thinner.

FIG. 6 shows a state in which the baby's body is like a cone. In the figure, θ represents an angle formed by a perpendicular to the tangent line at the waist (point A) and a horizontal line toward the center of the body, F represents a tightening force of the elastic body, P represents a frictional force caused by F, f1 indicates a slip-off force caused by F, and f2 indicates a vertical drag. Here, since f1 = Fsinθ and P = νN = νf2 = νFcosθ (ν represents a friction coefficient), the downward slipping force Z at the point A is represented by the following equation.
Z = f1−P = Fsinθ−νFcosθ = F (sinθ−νcosθ)
From this equation, it can be understood that when the waist portion is in a state where slipping occurs, the slipping force increases as the tightening force (F) increases.

  As described above, the pressure when the diaper 1 is worn in the first region 91 is 1.1 to 2.5 kPa. When the pressure at the time of wearing of the diaper 1 in the first region 91 is less than 1.1 kPa, it becomes difficult to fix the first region 91 of the diaper 1 to the wearer's iliac region, and as a result, the diaper 1 slips down. Therefore, the appearance of the diaper 1 in a worn state is extremely deteriorated. In particular, the looseness at the crotch part C of the diaper 1 becomes prominent and also causes leakage of urine and feces. On the other hand, when the pressure at the time of wearing of the diaper 1 in the first region 91 is more than 2.5 kPa, the wearer's body is excessively tightened, and the wearing operation of the diaper 1 becomes difficult. From the viewpoint of more effectively preventing the diaper 1 from falling off and further improving the appearance of the diaper 1 and the wearing operation of the diaper 1, the pressure when the diaper 1 is worn in the first region 91 is 1. It is preferably 1 to 2.0 kPa, and more preferably 1.2 to 1.8 kPa.

The pressure when wearing the diaper 1 in the first region 91 is, for example, when a laminate composed of an elastomer film and at least one cover stock layer laminated on the film is used as an abdominal and dorsal side elastic member, In the first region 91 where the elongation stress of the elastomer film is locally increased, for example, locally increased, it can be controlled by forming a small number of pores and forming a large number of pores in other regions. .
The belly side and back side elastic members are gathered by arranging and fixing a large number of elastic members between two sheets (preferably between two non-woven fabrics) in parallel and in an extended state. The elastic member of the type may be used, and in that case, the pressure at the time of wearing the diaper 1 in the first region 91 is to adjust the material, thickness, elongation rate, or arrangement interval of these elastic members. Can be controlled. The elastic member disposed in the first region 91 may be made of elastic material such as natural rubber, polyurethane resin, urethane foam resin, elastic nonwoven fabric or hot melt elastic member. (Rubber), net (net) or film is preferably used.

  The pressure when wearing the diaper 1 in the first region 91 is such that the diaper 1 is mounted on a cylinder having a circumference of 500 mm, and the mounting pressure measuring device (contact pressure measuring device (AMI3037-2 manufactured by AIM Techno Co., Ltd.)) Measured by. The specific measurement method is as follows.

[Method for Measuring Pressure in First Region 91]
Using an air pack of φ = 15 mm, set the air pack so that the center of the air pack is positioned at the tip of the waist opening, and measure the mounting pressure (P1). The position of the diaper width direction for setting the air pack is approximately the center between the left and right side edges of the diaper and the left and right side edges of the absorbent core 4 (position E in FIG. 2). Subsequently, the center of the 5 mm air pack is moved in the length direction of the diaper 1 to measure the mounting pressure (P2). Similarly, measurement is performed at intervals of 5 mm to obtain P3, P4, P5,. The measurement of P1 thru | or Pn is performed over the range into which the right-and-left both sides from the waist opening part to the leg opening part in the exterior body 10 are mutually joined. For P1 to Pn, a total of four points are measured on the ventral side, two on each side. These average values are taken as the pressure on the ventral region. Similarly, a total of four points are measured on the back side, and the average value is set as the mounting pressure on the back side. The distance between the portions corresponding to 1.1 to 2.5 kPa continuously in the values of P1 to Pn is defined as the width of the first region 91. For example, when P3 to P6 are applicable, the width of the region = (6-3) × 5 = 15 mm. The center of the first area 91 at that time is the midpoint between the measurement point 3 and the measurement point 6.

  The reason why the circumference of the cylinder is set to 500 mm is that the average length around the belly of an infant who is a main subject wearing the diaper 1 of the present embodiment is approximately 500 mm. The length of the abdomen around here is an average value of the abdomen circumference measured in the standing position and the sitting position in consideration of the change in the circumference of the abdomen when the posture of the infant changes. In the case of an adult diaper, a cylinder with a circumference of 850 mm is used instead of a cylinder with a circumference of 500 mm.

  The part from the wearer's iliac crest to the upper anterior iliac spine has a certain width, and the first region 91 of the diaper 1 is fixed to the part within the range of the width, so that the diaper 1 is slipped off. Can be effectively prevented. From this viewpoint, in the diaper 1 of the present embodiment, the width of the first region 91 (that is, the length of the first region 91 along the longitudinal direction of the diaper 1) W1 is set to 12 to 35 mm. When this width W1 is 20 to 35 mm, particularly 25 to 30 mm, the diaper 1 can be prevented from slipping off more effectively, and the appearance of the diaper 1 in the worn state and the wearing operation of the diaper 1 (easy to use) Etc.) can be further improved.

In a state where the diaper 1 is worn, the relationship between the dimensions of the diaper 1 and the wearer's physique in order for the first region 91 to abut on the site from the wearer's iliac crest to the superior anterior iliac spine. is important. For example, when an infant who is a main wear target person of a pants-type diaper is considered, in the unfolded state of the diaper 1, the center position (center position along the longitudinal direction of the diaper 1) and the diaper 1 And the center position of the first region 91 of the back side B (the center position along the longitudinal direction of the diaper 1) when the distance K1 between the center line CL of the diaper 1 is 180 to 230 mm and the diaper 1 is deployed. The 1st area | region 91 can be made to contact | abut successfully to a wearer's iliac area | region by setting the distance K2 between the longitudinal direction centerlines CL of the diaper 1 to 180-230 mm. This value is determined by carrying out body measurements of about 350 infants who are the main wearees of pants diapers. Specifically, as shown in FIG. 9, the abdominal side left-right center point at the horizontal position height of the upper anterior iliac spine is the upper anterior iliac spine height front center, and the dorsal side is the upper anterior iliac spine height. As the posterior center, the length from the center of the superior anterior iliac spine to the center of the posterior center of the superior anterior iliac spine via the crotch is defined as the longitudinal length of the superior anterior iliac spine. The numerical value obtained by adding the necessary length in consideration of the thickness of the diaper material is divided into two. By setting the distances K1 and K2 to 185 to 220 mm, particularly 195 to 215 mm, the first region 91 can be brought into more successful contact with the wearer's iliac region.
In the case of an adult diaper, the distance K1 and K2 are set to 300 to 350 mm, particularly 305 to 335 mm, so that the first region 71 can be brought into more successful contact with the wearer's iliac region.

  Although the 1st field 91 exists in ventral part A and dorsal part B, the pressure at the time of wearing in ventral part A and dorsal part B does not need to be exactly the same. However, if the configuration of the first region 91 of the ventral portion A and the dorsal portion B is excessively different, the left and right side portions of the longitudinal end portion of the exterior body 10 are joined to each other at the time of wearing. It may shift to either the front or back, and a defect may occur in the appearance of the diaper 1. Therefore, the ratio of (A−B) / A is within 30%, where A is the greater pressure when wearing the first region 91 in the ventral portion A and the dorsal portion B, and B is the smaller pressure. It is preferable.

  In the present invention, the longitudinal center line CL of the diaper 1 is joined to the side edges A1, A2 of the ventral side A of the diaper 1 and the side edges B1, B2 of the back side B without substantially shifting. In this case, it means a straight line along the diaper width direction passing through the midpoints of A1 and B1 in the unfolded state of the diaper 1 (see FIG. 3). Unlike this, as shown in FIG. 1, in the state where the waist opening 7 is opened upward, the position of the edge 17 of the waist opening on the back side B side is the waist on the abdominal side A side. In the case where it extends upward from the position of the edge 16 of the opening, or vice versa, the longitudinal center line of the diaper is defined on the assumption that there is no extension.

  In addition, although the full length L (refer FIG. 3) of the exterior body 10 in the expansion | deployment state of the diaper 1 can be set arbitrarily, when "diaper feeling" and "slip-off prevention property" at the time of diaper wearing and after use are considered, In infant diapers, it is preferably set to 470 to 540 mm. In consideration of “relief when wearing”, it is desirable to completely cover the navel, and from this point of view, it is preferably set to 490 to 580 mm. . In adult diapers, it is preferably set to 780 to 830 mm, and preferably set to 800 to 880 mm from the viewpoint of completely covering the navel.

  As described above, in the diaper 1 in the present embodiment, the diaper 1 is fixed to the wearer's body mainly by the fastening force of the first region 91. In other words, unlike the conventional pants-type diaper, the tightening force by the elastic member disposed in the waist opening 7 is the main means for fixing the diaper 1 to the wearer's body in the diaper 1 of the present embodiment. is not. On the other hand, it has been confirmed by the present inventors that if the tightening force of the waist opening 7 is increased, the diaper 1 is displaced. From this viewpoint, in the diaper 1 of the present embodiment, the pressure of the waist opening 7 when wearing the diaper is set to 0.3 to 1.2 kPa, which is a lower value than that of the conventional pants-type diaper. This pressure is preferably 0.5 to 1.0 kPa lower than the average value of the pressure in the first region 91 when the diaper is worn. Moreover, by setting the pressure of the waist opening 7 when wearing the diaper within the above range, there is an advantage that the waist opening 7 can be easily expanded when the diaper 1 is worn, and the wearing operation can be easily performed. In addition, when the pressure of the waist opening 7 is less than 0.3 kPa, the natural length of the diaper 1 before wearing becomes large, and problems such as poor appearance when viewed as clothes may occur.

  When the pressure of the waist opening 7 when wearing a diaper is more preferably 0.4 to 1.0 kPa, and even more preferably 0.4 to 0.8 kPa, the diaper 1 can be more effectively prevented from falling off. can do. The pressure of the waist opening 7 can be measured by the same method as the pressure of the first region 91 described above. That is, a cylinder having a circumferential length of 500 mm is inserted (mounted) into the waist opening 7 of the diaper 1, and the center of the air pack of the mounting pressure measuring device is positioned at a position of 15 mm in the longitudinal direction of the diaper from the front end of the waist opening. Measure the pressure. The measurement is performed at 10 points at intervals of 50 mm in the circumferential direction, and the average value is taken as the pressure at the waist opening. When the position of the edge 16 of the waist opening on the ventral side A side and the position of the edge 17 of the waist opening on the back side B are shifted, the ventral side and the back side overlap. The position closest to the end of the region is the waist opening. For example, as shown in FIG. 1, the pressure of the waist opening 7 adjusts the material, thickness, elongation rate, or arrangement interval of the waist elastic member 71 disposed at both ends in the longitudinal direction of the main body fixing portion 11. Can be controlled. When the pressure of the waist opening 7 falls within the pressure range of the first region 91, the position is included in the first region 91. In the case of an adult diaper, a cylinder with a circumference of 850 mm is used instead of a cylinder with a circumference of 500 mm.

  In the diaper 1 of the present embodiment, when the diaper is worn, a region other than the first region 91, the waist opening 7 and the leg opening 6, for example, the second region located between the first region 91 and the leg opening 6. The pressure in the region 92 is preferably 0.2 to 0.8 kPa, more preferably 0.3 to 0.6 kPa. As a result, the diaper 1 can be brought into close contact with the wearer's body with an appropriate pressure, and liquid leakage can be effectively prevented. When the diaper 1 is worn, the second region 92 contacts the lower region (lower abdomen) of the wearer's iliac region. The width of the second region 92 (that is, the length of the second region 92 along the longitudinal direction of the diaper 1) W2 is preferably 40 to 70 mm, particularly 45 to 65 mm.

  In this connection, in the diaper 1, when the pressures of the waist opening 7, the first region 91, and the second region 92 when the diaper is worn are compared, the pressure in the first region 91 is the highest, and then the waist It is preferable that the pressure in the opening 7 is high and the pressure in the second region 92 is the lowest. Providing such an order in the pressure of each part not only effectively prevents the diaper 1 from slipping off during wearing, but also the diaper 1 adheres to the wearer's body without a sense of incongruity, and liquid leakage is effective. Is prevented.

  The width of the central absorbent body 41 on the diaper longitudinal center line CL is preferably 35 to 55 mm, more preferably 40 to 50 mm for infant diapers, and preferably 45 for adult diapers. It is -65mm, More preferably, it is 50-60mm.

  As a material which comprises each part of the diaper 1 of this embodiment, what is normally used in the said technical field can be especially used without a restriction | limiting. For example, as the surface sheet 2, a hydrophilic and liquid-permeable nonwoven fabric or an apertured film can be used. As the back sheet 3, a liquid-impermeable material or a water-repellent material can be used. As the liquid-impermeable material, a resin film, a laminate material of a resin film and a nonwoven fabric, or the like can be used. As the water-repellent material, a water-repellent nonwoven fabric or the like can be used. As the water-repellent nonwoven fabric, the same nonwoven fabric as a material for forming a leak-proof cuff forming sheet described later can be used.

  Examples of the fibers in the case where the water-absorbent core 4 includes fibers other than the crosslinked fibers include, for example, hydrophilic fibers such as pulp fibers, rayon fibers, cotton fibers, and cellulose acetate, polyolefin fibers such as polyethylene and polypropylene, polyesters, Condensed fibers such as polyamide can be used. The superabsorbent polymer when the superabsorbent polymer 4 is contained in the water-absorbent core 4 includes sodium polyacrylate, (acrylic acid-vinyl alcohol) copolymer, cross-linked sodium polyacrylate, (starch- Acrylic acid) graft copolymers, (isobutylene-maleic anhydride) copolymers and saponified products thereof, polyaspartic acid, and the like. These fibers and superabsorbent polymers can be used singly or in combination of two or more.

As the sheet for forming a leak-proof cuff, multi-layered composite nonwoven fabrics consisting of spunbond, meltblown, spunbond, etc., spunbond nonwoven fabrics, heat bond nonwoven fabrics, air-through nonwoven fabrics, etc. can be used. from non-woven fabric preferably of the multi-layer structure comprising a spunbond and meltblown basis weight about 12 g / m ² is preferred. The sheet for forming a leak-proof cuff preferably has a water pressure measured in accordance with a water resistance test (low water pressure method) in a waterproof test method of JIS L1092 (1998) for textile products, preferably 3 cm or more, more preferably 5 cm. That's it. When measuring the water pressure resistance, the level device filled with water was raised at a speed of 10 ± 0.5 cm / min, and it was visually observed that water came out from three places on the back side of the test piece. Measure the water level at the time. In addition, it will measure without delay when the installation of the test piece is completed.

  According to the diaper 1 of the present embodiment, since both side portions of the absorbent core are made to stand when worn, a space is formed in the crotch portion, and it has an effect of holding soft stool, and the absorbent core contains crosslinked fibers. Therefore, even if the width of the crotch portion is narrow, the urine leakage prevention performance from the crotch portion is equal to or greater than that of a conventional diaper having a wide crotch width. This is because the absorbent body, which has a high compression recovery property when dry and wet, absorbs urine quickly, and the repeated absorption performance remains unchanged, so that urine cannot be absorbed completely and does not flow on the surface. Even if the width is narrow, crotch leakage is less likely to occur. Furthermore, since the side stretchable part does not shift, the narrow absorbent body fits the wearer's crotch part (crotch part) and does not cause a gap in the crotch, which is also effective in stool moisture performance.

  And in the diaper 1 of this embodiment, as shown in FIG. 4, the second sheet 9 which consists of a liquid-permeable nonwoven fabric is distribute | arranged between the surface sheet 2 and the absorptive core 4, and this second sheet | seat is arrange | positioned. 9 is arranged over substantially the entire surface of the absorbent core 4 on the skin contact surface side. Therefore, the above-mentioned ability absorbability, urine leakage prevention property, and repeated absorption performance can be made more remarkable.

  In addition, the first region 91 fits well to the wearer's iliac region and effectively prevents the diaper from falling off, while the side absorber that stands up is less prone to slipping down. It is difficult for the diaper to slip off due to the movement of the wearer during wearing. Therefore, the appearance of the wearing diaper can be kept good, and the wearer's operation is not hindered due to the diaper slipping. In addition, slipping is effectively prevented regardless of the waist elastic member, etc., so that the elastic member arranged in the diaper can prevent the wearer's body from being excessively tightened, and the wearing feeling is good become. Furthermore, the occurrence of leakage of urine and feces during wearing is further suppressed by suppressing the falling of the diaper.

As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to the said embodiment.
For example, in the exterior body 10, both side edges of one part in the longitudinal direction of the main body fixing part 11 and both side edges of the other part are connected via the ventral side elastic member 12 and the back side elastic member 14. It is good also as a structure connected instead of the structure currently performed through one continuous side expansion-contraction member.
Further, as the absorbent core 4, a crotch part C that is not separated into the central absorbent body 41 and the side absorbent body 42 is used, and both side portions of the absorbent core 4 are arranged in the vicinity of both side edges of the absorbent core 4. You may make it stand by the elastic member 9 distribute | arranged to. Further, the absorbent core 4 may be separated into the central absorbent body 41 and the side absorbent body 42 in the entire area in the longitudinal direction, or only the portion disposed on the ventral side part A and the crotch part C, or The central absorbent body 41 and the side absorbent body 42 may be separated only in the portions disposed on the back side portion B and the crotch portion C.
The arrangement position of the elastic member 9 for raising the side part of the absorbent core is not limited as long as it can contract and raise the side part of the absorbent core, and the arrangement position is on the skin contact surface side of the absorbent core 4. It may be between the surface and the surface sheet 2, between the surface on the non-skin contact surface side of the absorbent core 4, and the surface sheet 2 folded back to the surface side.

  The leak-proof cuff 6 can be omitted. Moreover, when providing the leak-proof cuff 6, instead of fixing the leak-proof cuff forming sheet 60 in the mode shown in FIG. 4, it can be fixed in the mode shown in FIG. Further, the fixed end 63 of the leak-proof cuff 6 may be formed by fixing the leak-proof cuff forming sheet 60 to the exterior body 10, and the leak-proof cuff forming sheet 60 is the non-skin of the absorbent main body 5. It may be formed fixed to the contact surface, or may be sandwiched between the non-skin contact surface of the absorbent main body 5 and the exterior body 10 and fixed to both.

It is a perspective view of the underpants type diaper as one embodiment of the present invention. The front view which shows the state which made the diaper shown in FIG. 1 the state which contacted the skin contact surface of the abdominal part and the skin contact surface of the back part, and was seen from the non-skin contact surface side of the abdominal part. It is. It is a top view which shows the state which peeled the side junction part and made the unfolded state the diaper shown in FIG. It is a cross-sectional view which shows typically the cross section which follows the CL line | wire of FIG. 3 in a diaper wearing state. It is explanatory drawing which shows an iliac bone. It is explanatory drawing which shows the calculation method of the slipping-off force in a wearer's waist part. It is explanatory drawing which shows the measuring method of upper anterior iliac spine height front and back length. FIG. 5 is a view corresponding to FIG. 4 in another embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Disposable diaper 2 Top sheet 3 Back sheet 4 Absorbent core 5 Absorbent main body 6 Leak-proof cuff 7 Waist opening 8 Leg opening 9 Elastic member 10 for side part raising Exterior body A Abdominal side B Back side C Inseam

Claims (2)

An absorbent main body having a topsheet and an absorbent core; and an exterior body positioned on the non-skin contact surface side of the absorbent main body to fix the absorbent main body. In pants-type disposable diapers where leg openings are formed,
The absorbent core contains cross-linked fibers,
In the vicinity of both side edges in the longitudinal direction of the absorbent core, side-starting elastic members are arranged along the longitudinal direction, and both side parts of the absorbent core stand up when wearing a diaper. And
Between the waist opening and the leg opening in each of the ventral side and the back side of the diaper, there is a region where the wearing pressure when wearing the diaper is 1.1 to 2.5 kPa,
The region is formed in a portion that comes into contact with a portion from the wearer's iliac crest to the upper anterior iliac spine when the diaper is worn, and the wearing pressure when the diaper is worn is the waist opening. A pants-type disposable diaper designed to be higher than the wearing pressure when wearing a diaper. The absorbent core is separated into a central absorbent body and a pair of side absorbent bodies located on both sides of the central absorbent body, at least in the crotch part of the diaper, and the elastic member for raising the side part comprises: The pants-type disposable diaper according to claim 1, wherein the pants-type disposable diaper is disposed in the vicinity of the outer edge of each of the pair of side absorbers.

Images