JP2010279813A - Pants type disposable diaper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pants type disposable diaper which is resistant to the falling down of the diaper which is attributed to the movement of a wearer and so on during the wear of the diaper. <P>SOLUTION: In a pants type disposable diaper 1, an absorber body which includes an absorbent core and an external capsule material are provided, and a waist opening part 5 and a pair of leg opening parts 6, 6 are formed. The external capsule material has a structure where two elongational sheets are stacked. At least, one of the elongational sheets has stretching properties. A high mounting compression area 71 which arranges a separate elastic sheet from the two elongational sheets or the high mounting compression area 71 where a sheet with stretch properties of the two elongational sheets forms a stratified part more than two layers is contained between the waist opening part 5 and the leg opening parts 6, 6 in the ventral part and the dorsal part of the diaper respectively. The high mounting compression area 71 maintains a higher pressure than a peripheral area 72 of the waist opening part and an area 73 of the leg opening parts side from the high mounting compression area respectively when wearing the diaper. <P>COPYRIGHT: (C)2011,JPO&INPIT

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 slipped off during wearing and the appearance is deteriorated, and the wearer may not easily move due to the slipping off. Moreover, since a strong tightening pressure is applied to the waist opening, there is a possibility that it is difficult to wear the diaper.

Japanese Patent Laid-Open No. 9-84826 Japanese Utility Model Publication No. 6-421

  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 includes an absorbent body including an absorbent core, and an outer packaging material disposed on the non-skin contact surface side of the absorbent body to fix the absorbent body, and includes a waist opening and a pair of legs A pants-type disposable diaper in which an opening is formed, wherein the outer packaging material has a structure in which two extensible sheets are laminated, and at least one of the two extensible sheets has elasticity. And a stretchable sheet different from the two extensible sheets is disposed between the waist opening and the leg opening in each of the stomach side and the back side of the diaper. A mounting pressure region or a stretchable sheet of the two extensible sheets has a high mounting pressure region in which two or more layers are formed, and the high mounting pressure region includes the waist The leg opening is larger than the peripheral area of the opening and the high mounting pressure area. Than the respective section side region, in which to achieve the above object by providing a shorts type disposable diaper pressure during wearer has been made higher.

  In the pants-type disposable diaper of the present invention, it is difficult for the diaper to fall off due to the movement of the wearer during wearing of the diaper. In particular, bumping of the crotch of the diaper is difficult to occur. Therefore, the appearance of the diaper in a worn state can be kept good. The wearer's movement is not hindered due to the slipping of the diaper. Moreover, it is prevented that the elastic member distribute | arranged to the diaper overtightens a wearer's body, and a feeling of wear becomes favorable. Furthermore, by preventing the diaper from falling off, the occurrence of urine and stool leakage during wearing is suppressed.

  The present invention will be described below based on preferred embodiments with reference to the drawings. The perspective view of one Embodiment of the underpants type disposable diaper of this invention is shown by FIG. FIG. 2 shows a plan view of the developed state of the diaper of FIG. FIG. 3 shows an exploded perspective view of the diaper of FIG.

  The diaper 1 of the present embodiment has a liquid-permeable top sheet 2, a liquid-impermeable or water-repellent back sheet 3, and a liquid-retaining absorbent core 4 interposed between both sheets 2 and 3. In particular, a vertically long absorbent body 10 and an outer packaging material 11 disposed on the back sheet 3 side of the absorbent body 10 are provided.

  The outer packaging material 11 has an hourglass-like shape in which both side edges are bound inwardly in the central portion in the longitudinal direction, and defines the outline of the diaper. The outer packaging material 11 is divided in the longitudinal direction into an abdominal side A disposed on the wearer's abdominal side, a back side B disposed on the back side, and a crotch C positioned therebetween. The abdomen A and the back B correspond to the longitudinal front and rear ends of the outer packaging material 11, and the crotch C corresponds to the longitudinal center of the outer packaging material 11. In the outer packaging material 11, both side edges A1 and A2 of the ventral side A and both side edges B1 and B2 of the back side B are joined together, and the diaper 1 has a waist opening 5 and a pair of leg openings 6. It is formed. By this joining, a pair of side seal portions S are formed on the left and right side edges of the diaper 1. For this joining, for example, heat sealing, high frequency sealing, ultrasonic sealing or the like is used.

  The top sheet 2, the back sheet 3, and the absorbent core 4 each have a rectangular shape, and are integrated to form a vertically long absorbent body 10. As the surface sheet 2, the leak-proof sheet 3, and the absorbent core 4, those similar to those conventionally used for this type of diaper can be used. For example, as the absorptive core 4, what is comprised from the particle | grains and fiber material of a superabsorbent polymer, and is coat | covered with the tissue paper (not shown) etc. can be used.

  As shown in FIG. 2, side cuffs 8, 8 made of a liquid-resistant or water-repellent and breathable material are formed on the left and right sides of the absorbent body 10 in the longitudinal direction. In the vicinity of the free end of each side cuff 8, a side cuff elastic member 81 is disposed in an extended state. Thereby, when the diaper 1 assembled as shown in FIG. 1 is worn, the side member cuff 8 stands up due to the elastic member 81 contracting, and the outflow of liquid in the width direction of the absorbent body 10 is prevented. Is done. In FIG. 3, a sheet material for forming the side cuffs 8 and 8 is indicated by reference numeral 82. When the sheet material 82 is in the state of the diaper 1, a portion 82 </ b> S having a predetermined width on the outer side in the width direction of the absorbent main body 10 is wound down to the non-skin contact surface side of the back sheet 3. It is fixed between the material 11. The back sheet 3 is fixed to the outer packaging material 11 by a known joining means such as an adhesive 15.

  The outer packaging material 11 has a structure in which two stretchable nonwoven fabrics 12 and 13 are laminated. That is, it has the outer-layer nonwoven fabric 12 and the inner-layer nonwoven fabric 13 arranged on the inner surface side of the outer-layer nonwoven fabric 12, both of which are made of stretchable nonwoven fabric. In the diaper 1 of the present embodiment, the outer layer nonwoven fabric 12 forms the outer surface of the diaper 1, and the inner layer nonwoven fabric 13 is joined to the inner surface side of the outer layer nonwoven fabric 12 by an adhesive 14 such as a hot melt adhesive. The outer layer nonwoven fabric 12 and the inner layer nonwoven fabric 13 are preferably both water-repellent in view of the liquid oozing property.

Here, the stretchable nonwoven fabric has a recovery rate of 70% or more when stretched at least in the width direction. For example, an elastic fiber sheet, a composite of an elastic fiber sheet and a nonwoven fabric, a film and a nonwoven fabric , Composites of stretchable nets and nonwoven fabrics, and those using heat-shrinkable fibers. Among these, at least one surface of an elastic fiber sheet made of an elastic fiber aggregate is formed by combining a stretchable fiber aggregate and then subjected to a stretching process. This is preferable from the viewpoint of ease of elongation.
The outer layer nonwoven fabric 12 and the inner layer nonwoven fabric 13 may be stretchable nonwoven fabrics having the same configuration or may be stretchable nonwoven fabrics having different configurations.

  A plurality of waist elastic members 51, 51 are arranged along the width direction of the front and rear end portions of the outer packaging material 11 along the front and rear end edges. The waist elastic members 51 and 51 are sandwiched and fixed in an expanded state by the outer layer nonwoven fabric 12 and the inner layer nonwoven fabric 13. Each waist part elastic member 51, 51 is in a state in which both side edges A1, A2 of the ventral side part A of the diaper 1 and both side edges B1, B2 of the back side part B are joined (joined part) to each other in FIG. As shown in FIG. 2, a substantially continuous ring-shaped waist gather is formed near the waist opening 5 of the diaper 1.

  In addition, leg elastic members 61 a and 61 b are disposed on the left and right curved portions of the outer packaging material 11. Each leg part elastic member 61a, 61b is distribute | arranged along the said curved part. Each leg part elastic member 61a, 61b is distribute | arranged between the outer-layer nonwoven fabric 12 and the inner-layer nonwoven fabric 13, and is fixed to both the nonwoven fabrics 12 and 13 in the expansion | extension state with the adhesive agent. One end of each leg part elastic member 61a, 61b overlaps in the crotch part C. On the other hand, the other end is terminated at the position of each side edge of the ventral side A and the back side B. As shown in FIG. 1, each leg elastic member 61 a, 61 b is in a state where both side edges A 1, A 2 of the ventral side A of the diaper 1 and both side edges B 1, B 2 of the back side B are joined together. A substantially ring-shaped leg gather is formed in the vicinity of the leg openings 6 and 6 of the diaper 1. Elastic material such as natural rubber, polyurethane resin, foamed urethane resin, hot melt elastic member, etc. is formed into a thread (thread rubber) or a belt (flat rubber) for the waist elastic member and leg elastic member, respectively. What has been used is preferably used.

  As shown in FIG. 3, the outer layer nonwoven fabric 12 constituting the outer packaging material 11 has a length that extends further than a portion where the waist elastic members 51 and 51 are sandwiched and fixed by the outer layer nonwoven fabric 12 and the inner layer nonwoven fabric 13. And the part 12a extended from the inner-layer nonwoven fabric 13 of the outer-layer nonwoven fabric 12 is return | folded by the absorber main body 10 side, as shown in FIG.

  In the diaper 1 of this embodiment, as shown in FIG. 4, the center part of the diaper vertical direction between the waist opening part 5 and the leg opening part 6 in each of the ventral side A and the back side part B of the diaper 1. The stretchable sheet 7 different from the outer layer nonwoven fabric 12 and the inner layer nonwoven fabric 13 described above is disposed at a position slightly closer to the waist opening 5, and the region where the stretchable sheet 7 is disposed is the high attachment pressure region 71. It has become. In the high wearing pressure region 71, the pressure when wearing the diaper is higher than the pressure when wearing the diaper in the peripheral region 72 of the waist opening 5 located above the diaper. Further, in the high wearing pressure region 71, the pressure when wearing the diaper is higher than the pressure when wearing the diaper in the region 73 on the leg opening side than the region 71.

  In the diaper 1 of the present embodiment, the pressure when the diaper 1 is worn in the high wearing pressure region 71 is 0.8 to 2.5 kPa. The high wearing pressure region 71 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 9a in FIG. 5, and the superior anterior iliac spine is a part indicated by 9b 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 the wearer, especially infants, has a waist that protrudes as a physical feature, so if the tightening pressure at the waist opening that abuts the protruding belly is increased, the waist 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 belly circumference 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, in the present embodiment, the pressure when the diaper 1 is worn in the high wearing pressure region 71 is 0.8 to 2.5 kPa. When the pressure when the diaper 1 is worn in the high wearing pressure region 71 is 0.8 kPa or more, it is easy to fix the high wearing pressure region 71 of the diaper 1 to the wearer's iliac region, and as a result, the diaper 1 Is prevented, and the appearance of the diaper 1 in a worn state is also improved. In particular, the looseness at the crotch part C of the diaper 1 can be remarkably suppressed, and leakage of urine and feces can be effectively prevented. On the other hand, when the pressure when the diaper 1 is worn in the high wearing pressure region 71 is 2.5 kPa or less, the wearer's body can be prevented from being excessively tightened, and the wearing operation of the diaper 1 is easy. 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 high wearing pressure region 71 is 1 0.1 to 2.5 kPa is preferable, 1.1 to 2.0 kPa is more preferable, and 1.2 to 1.8 kPa is still more preferable.

  As the stretchable sheet 7 that can be used for forming the high mounting pressure region 71, the basis weight of the stretchable nonwoven fabric similar to that described above as the nonwoven fabric constituting the outer layer nonwoven fabric 12 and the inner layer nonwoven fabric 13 or the same stretchable nonwoven fabric is increased. A stretchable net, a stretchable film, a urethane sheet, or the like can be used. In addition, a sheet other than these can be widely used in which the pressure in the high mounting pressure region 71 can be increased more than other portions. As the elastic sheet 7, it is preferable to use a sheet having a higher stress at the time of contraction than the elastic nonwoven fabric constituting the outer layer nonwoven fabric 12.

  The pressure when the diaper 1 is worn in the high wearing pressure region 71 is worn by attaching the diaper 1 to a cylinder having a circumference of 500 mm, and a wearing pressure measuring device (contact pressure measuring device (AMI3037-2 manufactured by AIM Techno Co., Ltd.)). ). The specific measurement method is as follows.

[Measurement Method of Pressure in High Wear Pressure Area 71]
Using an air pack of φ = 15 mm, the air pack is inserted between the diaper 1 and the cylinder, and the mounting pressure is measured. The center of the air pack is located substantially in the center between the left and right side edges of the diaper and the left and right side edges of the absorbent core 4 in the diaper width direction, and in the diaper vertical direction, the high wearing pressure region 71 is set so as to be positioned at the center position C71 in the vertical direction of the diaper (the position where the center of the air pack is positioned is indicated by P1 in FIG. 2). The measurement of the pressure in the high wearing pressure region 71 is performed on both the left and right sides of the abdominal side A and the left and right sides of the back side B, and the average value of the four measured values in total is used as the pressure in the high wearing pressure region 71.

  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 high wearing pressure region 71 of the diaper 1 is fixed to the part within the range of the width, thereby shifting the diaper 1. Falling can be effectively prevented. From this viewpoint, in the diaper 1 of the present embodiment, the width of the high mounting pressure region 71 (that is, the length of the high mounting pressure region 71 along the longitudinal direction of the diaper 1) W1 is set to 12 to 35 mm. When the width W 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 wearing state and the wearing operation of the diaper 1 (easy to use) Etc.) can be further improved.

In order for the high wearing pressure region 71 to come into contact with the site from the wearer's iliac crest to the superior anterior iliac spine while wearing the diaper 1, the dimensions of the diaper 1 and the wearer's physique Relationship 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 in the longitudinal direction of the diaper 1) C71 and the diaper in the abdomen side portion A The distance K1 (refer to FIG. 3) between the longitudinal center line CL of the first diaper 1 is 180 to 220 mm, and the center position of the high wearing pressure region 71 on the back side B (the longitudinal length of the diaper 1) when the diaper 1 is deployed. Center position in the direction) The distance K2 (see FIG. 3) between C71 and the longitudinal center line CL of the diaper 1 is set to 180 to 220 mm, so that the high wearing pressure region 71 can be successfully applied to the iliac region of the wearer. It can be made to contact. 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. 7, 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 upper 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 215 mm, particularly 185 to 210 mm, the high wearing pressure region 71 can be brought into more successful contact with the wearer's iliac region.
In the case of an adult diaper, by setting the distances K1 and K2 to 300 to 350 mm, particularly 305 to 335 mm, the high wearing pressure region 71 can be brought into more successful contact with the wearer's iliac region. .

  Although the high wearing pressure region 71 exists in the ventral part A and the dorsal part B, the pressures during wearing in the ventral part A and the dorsal part B do not have to be exactly the same. However, if the configuration of the high attachment pressure region 71 of the ventral side A and the back side B is excessively different, the left and right side portions of the longitudinal front and rear end portions of the outer packaging material 11 are joined to each other at the time of attachment. In this case, the diaper 1 may be displaced to the front or back, resulting in a defect in the appearance of the diaper 1. Therefore, when the larger pressure at the time of wearing the high wearing pressure region 71 in the ventral part A and the dorsal part B is A and the smaller one is B, the ratio of (A−B) / A is within 30%. Preferably there is.

  The above-described 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 the 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. 2). Unlike this, for example, as shown in FIGS. 8A and 8B, both side edges A1, A2 of the ventral side A are not joined to both side edges B1 ′, B2 ′ of the back side B, In the case of joining at B1 and B2 which are positions inward in the longitudinal direction from both side edges B1 ′ and B2 ′, assuming that there is no region from B1 and B2 to B1 ′ and B2 ′, As before, a longitudinal centerline of the diaper is defined.

  In addition, although the full length L of the outer packaging material 11 in the unfolded state of the diaper 1 can be arbitrarily set, it is set to 460 to 520 mm in consideration of “clean feeling” and “prevention of slipping” when the diaper is mounted and after use. It is preferable to do. In addition, in consideration of “relief at the time of wearing”, it is desirable to completely cover the navel, and from this point of view, it is preferable to set it to 490 to 580 mm.

  In the diaper 1 according to the present embodiment, the diaper 1 is fixed to the wearer's body mainly by the tightening force of the high wearing pressure region 71. In other words, unlike the conventional pants-type diaper, the tightening force by the peripheral region 72 of the waist opening 5 is not the main means for fixing the diaper 1 to the wearer's body in the diaper 1 of the present embodiment. . On the other hand, it has been confirmed by the present inventors that if the tightening force of the peripheral region 72 of the waist opening 5 is increased, the diaper 1 is displaced. From this viewpoint, in the diaper 1 of the present embodiment, the pressure in the peripheral region 72 of the waist opening 5 when wearing the diaper (hereinafter also referred to as the pressure of the waist opening 5) is higher than that of a conventional pant-type diaper. The lower value is 0.3 to 1.5 kPa. This pressure is preferably 0.5 to 1.0 kPa lower than the average value of the pressure in the high wearing pressure region 71 when the diaper is worn. Moreover, by setting the pressure of the waist opening 5 at the time of wearing the diaper within the above range, there is an advantage that the waist opening 5 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 5 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 5 when wearing a diaper is more preferably 0.4 to 1.2 kPa, and even more preferably 0.4 to 1.0 kPa, the diaper 1 is prevented from slipping off more effectively. can do. The pressure in the waist opening 5 can be measured by the same method as the pressure in the high wearing pressure region 71 described above. That is, a cylinder having a circumferential length of 500 mm is inserted (attached) into the waist opening 5 of the diaper 1, and the center of the air pack of the attachment pressure measuring device is located at a position 15 mm in the diaper longitudinal direction 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. As shown in FIGS. 8A and 8B, when the position of the edge of the waist opening on the abdomen and the position of the edge of the waist opening on the back are misaligned, Of the region where the side overlaps, the position closest to the end is defined as the waist opening.

  In the diaper 1, it is preferable that the elastic members 61a and 61b are arranged in an extended state substantially along the leg opening. And it is preferable that the pressure of the leg opening part 6 at the time of diaper wear is 1.0-2.4 kPa, especially 1.2-2.2 kPa. When the pressure of the leg opening 6 at the time of wearing the diaper is within the above range, the opening end of the leg opening 6 fits the wearer's buttocks appropriately, and the liquid leakage from around the leg of the wearer is effective. Can be prevented. Moreover, even if the weight in the crotch of the diaper 1 increases due to urination / defecation during use, the absorber is prevented from separating from the wearer's body in the crotch, and the appearance of the diaper 1 being worn is deteriorated. And leakage of urine and feces is prevented. As a result, effects such as being able to keep the diaper 1 in a worn state in a good state can be obtained.

  The mounting pressure at the leg opening is measured by the following method. The device / air pack is the same as the waist opening measurement. A cylinder having a circumferential length of 300 mm is inserted into (attached to) the leg opening 6 of the diaper 1, and six points are measured at intervals of 50 mm in the circumferential direction at the portion where the elastic members 61 a and 61 b are arranged. When there are a plurality of elastic members 61a and 61b, measurement is performed at the center point of the width of the region where the elastic members are arranged. The average value of 12 points on the right foot and left foot is taken as the mounting pressure of the leg opening 6. For those where the leg elastic members 61a and 61b are not completely or partially, the mounting pressure in the region where the side cuff elastic members 81 are disposed in the corresponding portion is used as the mounting pressure of the leg opening. The reason why the circumference of the cylinder is 300 mm is that the average length of the buttocks (foot circumference) of the infant who is the main subject wearing the diaper 1 of the present embodiment is approximately 300 mm.

Furthermore, in the diaper 1 of the present embodiment, the pressure when the diaper is worn in the region 73 (also referred to as the lower region 73) on the leg opening 6 side with respect to the high wearing pressure region 71 is the same as that when the diaper is worn in the high wearing pressure region 71. Lower than pressure. When the pressure in the lower region 73 is low and the pressure in the high wearing pressure region 71 is also low, 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.
The pressure in the lower region 73 is preferably 0.3 to 2.3 kPa lower than the pressure in the high mounting pressure region, and more preferably 0.5 to 2.2 kPa lower. The pressure in the lower region 73 is preferably 0.05 to 0.8 kPa, more preferably 0.1 to 0.6 kPa.
When the diaper 1 is worn, the lower region 73 comes into contact with the lower region (lower abdomen) of the wearer's iliac region. The width of the lower region 73 (that is, the length of the second region 72 along the longitudinal direction of the diaper 1) W2 is preferably 40 to 70 mm, particularly 45 to 65 mm.

  The pressure in the lower region 73 can be measured by the same method as the pressure in the high mounting pressure region 71 described above. That is, a cylinder having a circumferential length of 500 mm is inserted (attached) from the waist opening 5 of the diaper 1 to a depth reaching the leg openings 6 and 6, and the attachment pressure is measured. The measurement of the pressure in the lower region 73 is performed on both the left and right sides of the abdominal side A and the left and right sides of the back side B, and the average value of a total of four measurement values is used as the pressure in the lower region 73. In the measurement of the pressure in the lower region 73 on the ventral side A, the air pack has a center between the right and left side edges of the diaper and the left and right side edges of the absorbent core 4 in the diaper width direction. It is located at the center, and is set so as to be located at the center in the longitudinal direction between the high mounting region 71 and the leg elastic member 61a in the diaper longitudinal direction. In the measurement of the pressure in the lower region 73 on the back side B, the center of the air pack is approximately between the left and right side edges of the diaper and the left and right side edges of the absorbent core 4 in the diaper width direction. It is located at the center, and in the diaper longitudinal direction, the distance from the longitudinal center line CL is set to a position that is the same as the set position on the ventral side A. In FIG. 2, the position where the center of the air pack is located is indicated by P2.

According to the diaper 1 of the present embodiment, the elastic sheet 7 is arranged at a predetermined site, and the high wearing pressure region 71 has a high pressure when the diaper is worn, and the high wearing pressure region 71 is the intestine of the wearer. In order to prevent the slipping off by satisfactorily coming into contact with the bone part, it is difficult for the diaper to fall off due to the movement of the wearer during wearing of the diaper. Moreover, since the outstanding slip prevention performance is obtained even if it does not clamp the peripheral area | region of a waist opening part, a feeling of wear becomes favorable.
Moreover, since the high attachment pressure area | region 71 where the pressure at the time of diaper wear is high has arranged and formed the elastic sheet 7 different from the two elastic nonwoven fabrics which comprise an outer packaging material, the same elastic sheet It is easier to control the stress than using the two layers. The stretchable sheet 7 is fixed to both side edges of the abdominal side A and the back side B, and the skin contact surface of the absorbent main body 10 is overlapped with the absorbent main body 10. It is fixed to.

  In the diaper 1 of this embodiment, as shown in FIG. 3, the outer layer nonwoven fabric 12 and the inner layer nonwoven fabric 13 are not joined to each other in most of the stomach side A and the back side B of the diaper. Specifically, the narrow central joint 14 formed by applying an adhesive over the entire length in the longitudinal direction of the outer packaging material 11 to the peripheral edge of the outer packaging material 11 and the central portion in the width direction of the outer packaging material 11. Only, the outer layer nonwoven fabric 12 and the inner layer nonwoven fabric 13 are joined. In most of each of the ventral side A and the back side B of the diaper, the outer nonwoven fabric 12 and the inner nonwoven fabric 13 are not joined to each other, so that the original stretching of the stretchable nonwoven fabric is not hindered. The air permeability is improved by not using an adhesive for bonding. In the ventral part A, the ratio of the area where the outer nonwoven fabric 12 and the inner nonwoven fabric 13 are not joined to the total area of the ventral part A is preferably 70% or more, and is 80 to 100%. Is more preferable. The same applies to the back side portion B side.

  Next, the disposable diaper as other embodiment of this invention is demonstrated with reference to FIG.9 and FIG.10. In the following description, a different point from the diaper 1 mentioned above is demonstrated, and description is abbreviate | omitted about the same point. About the point which is not mentioned especially, the description regarding the diaper 1 mentioned above is applied suitably. In FIG.9 and FIG.10, the same code | symbol is attached | subjected to the structural member similar to the disposable diaper 1. FIG.

In the diaper shown in FIG. 9, the outer layer nonwoven fabric 12a folded back at the waist opening 5 is folded back so that a two-layered layer portion 7A is formed on the skin contact surface side of the inner layer nonwoven fabric 13, and the two layers. The region where the multi-layer portion 7A is disposed is a high mounting pressure region 71 in which a total of four layers of stretchable nonwoven fabrics are laminated in the thickness direction.
In the diaper shown in FIG. 10, the outer layer nonwoven fabric 12a folded back at the waist opening 5 is folded in a three-fold state so that a three-layered layer portion 7B is formed on the skin contact surface side of the inner layer nonwoven fabric 13. The region where the three layers of the multilayer portions 7B are arranged is a high wearing pressure region 71 in which a total of five layers of stretchable nonwoven fabrics are laminated in the thickness direction.

In this way, even when the outer layer nonwoven fabric 12a folded at the waist opening 5 is used to form the high wearing pressure region 71 having a higher pressure when wearing the diaper than the upper and lower regions, the diaper is being worn. It is difficult for diapers to fall off due to wearer's movements. Moreover, since the outstanding slip prevention performance is obtained even if it does not clamp the peripheral area | region of a waist opening part, a feeling of wear becomes favorable.
Moreover, the effect similar to the disposable diaper 1 mentioned above is show | played. Moreover, since the high attachment pressure area | region 71 with the high pressure at the time of diaper wear is formed by forming the multilayer part 7A, 7B of two or more layers on one side of the two elastic nonwoven fabrics which comprise an outer packaging material, Separate processes (procurement of materials, cutting, conveyance, joining) are not required, and formation is easy by folding and joining the outer packaging material. Further, since the joining is simply performed by folding, the positional displacement of the overlapping nonwoven fabrics is not formed.

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 diaper shown in FIG. 9 and FIG. 10, only the outer layer nonwoven fabric 12 was folded at the waist opening 5, but both the outer layer nonwoven fabric 12 and the inner layer nonwoven fabric 13 were folded back to the skin contact surface side. It is also possible to fold both nonwoven fabrics so as to form multiple layers to form a high mounting pressure region. Moreover, the multilayer part formed with the nonwoven fabric turned up by the waist opening part can be made into the multilayer part of four layers or more instead of 2 layers or 3 layers.
Further, in the multilayer portion where the outer layer nonwoven fabric 12 is folded twice as shown in FIG. 10, only the nonwoven fabric portion that directly contacts the skin, the central portion in the diaper width direction is not joined to the folded portion of the lower diaper. By joining the left and right side edges of 1 with a pair of side seal portions S, an elastic nonwoven fabric that does not interlock with the main body of the diaper 1 can form a leak-proof wall for the waist opening 5.

One of the outer layer nonwoven fabric 12 and the inner layer nonwoven fabric 13 has extensibility, but may not have elasticity. For example, in the diaper of each embodiment described above, a substantially non-stretchable sheet can be used instead of the stretchable inner layer nonwoven fabric 13. As the substantially non-stretchable sheet, various known ones can be used, for example, a sheet having a number of dispersed slits extending in the longitudinal direction of the diaper and extending in the diaper width direction by opening the slits. Etc. can be used. As the non-stretchable sheet, in addition to a single layer or multilayer nonwoven fabric, a laminate of a nonwoven fabric and a film, etc., which has been subjected to slit processing can be used.
Moreover, it has a high wearing pressure area formed by arranging a stretchable sheet on one of the belly side and back side of the diaper, and a high wearing formed by arranging a multilayer part of the stretchable sheet on the other side. It may have a pressure region.

In the disposable diaper 1 described above, both side edges A1, A2 of the ventral side A and both side edges B1, B2 of the back side B are joined to each other to form a side seal portion. Alternatively, it may be pre-engaged with various engaging members such as buttons and hook-and-loop fasteners to form a pants shape. Further, the joining or engaging position between the side edges A1 and A2 of the ventral side A and the side edges B1 and B2 of the back side B is not limited to the position directly beside the body, but is slightly forward or rearward of the body. It may be.
On the non-skin surface side of the outer layer nonwoven fabric 12 of the disposable diaper 1 described above, when the outer layer nonwoven fabric 12 and the inner layer nonwoven fabric 13 are joined with an adhesive 14 such as a hot melt pressure sensitive adhesive, a hot melt pressure sensitive adhesive or the like is used. By fixing the disposal tape at a position overlapping with the adhesive 14, the disposable diaper 1 that can be discarded in a compact manner can be obtained while maintaining the stretchability of the disposable diaper 1.

  Hereinafter, the present invention will be described in more detail with reference to examples. However, the scope of the present invention is not limited to such examples.

[Example 1]
A pants-type diaper was produced in FIGS. As the outer layer nonwoven fabric 12 and the outer layer nonwoven fabric 13, those obtained by compounding non-elastic fibers on both sides of the elastic fiber were used, and as the stretchable sheet 7, those obtained by compounding non-elastic fibers on both sides of the elastic film were used. Table 1 shows the pressure when wearing each part of the diaper. In the unfolded state, the distance from the longitudinal center line CL to the center position C71 of the high attachment pressure region on the abdomen and the dorsal side was 180 to 220 mm.

[Example 2]
Using the outer layer nonwoven fabric 12a folded back to the absorbent main body 10 side in the waist opening 5 without using the stretchable sheet 7, as shown in FIG. 9, a high wearing pressure region 71 made of a total of four layers of stretchable nonwoven fabric is formed. A pants-type diaper was produced in the same manner as in Example 1 except that it was formed. The peripheral region 72 of the waist opening of the diaper is composed of three layers of stretchable nonwoven fabric, and the lower region 73 is composed of two layers of stretchable nonwoven fabric. Table 1 shows the pressure when wearing each part of the diaper.

Example 3
Using the outer layer nonwoven fabric 12a folded back to the absorbent main body 10 side in the waist opening 5 without using the stretchable sheet 7, as shown in FIG. 10, a high wearing pressure region 71 made of a total of five layers of stretchable nonwoven fabric is formed. A pants-type diaper was produced in the same manner as in Example 1 except that it was formed. The peripheral region 72 of the waist opening of the diaper is composed of three layers of stretchable nonwoven fabric, and the lower region 73 is composed of two layers of stretchable nonwoven fabric. Table 1 shows the pressure when wearing each part of the diaper.

[Comparative Example]
In Example 2, the outer layer nonwoven fabric 12a folded back to the absorbent main body 10 side at the waist opening 5 is extended to the position where the high mounting pressure region is formed in Example 2 without forming a two-layered multilayer part. A pants-type diaper was produced in the same manner as in Example 2 except that the above was used. Table 1 shows the pressure when wearing each part of the diaper. Table 1 shows the pressures of the parts corresponding to the respective parts in Example 1.

[Evaluation]
The obtained diapers were attached to three 1 to 2 year old infants and evaluated as follows. The results are shown in Table 2.
(1) Operability when wearing (easy to put diapers on)
○: Easy to fold △: Slightly fragile ×: Slightly difficult (2) Position shift in the high mounting pressure area 60 minutes after mounting ○: No position shift △: Slight position shift ×: Position shift (3) 60 minutes mounted Misalignment of rear waist opening ○: No misalignment Δ: Slight misalignment ×: Misalignment (4) Rubber trace on body part corresponding to peripheral area of waist opening 60 minutes after wearing ○: Rubber trace None △: Some rubber marks ×: Rubber marks (5) Tightening traces in the body part corresponding to the high wearing pressure area 60 minutes after wearing ○: No tightening traces △: Some tightening traces X: Tightening traces

It is a perspective view which shows one Embodiment of the underpants type disposable diaper of this invention. It is a top view which shows the unfolded state of the diaper shown in FIG. It is a disassembled perspective view of the diaper shown in FIG. 4A is a cross-sectional view taken along the line II-II in FIG. 2, and FIG. 4B is a cross-sectional view taken along the line III-III in FIG. 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. It is a figure which shows another embodiment of the diaper of this invention, Fig.8 (a) is a perspective view, FIG.8 (b) is a top view which shows an unfolded state. It is a figure which shows another embodiment of the diaper of this invention, FIG. 9 (a) is a figure equivalent to FIG. 4 (a), FIG.9 (b) is a figure equivalent to FIG.4 (b). It is a figure which shows another embodiment of the diaper of this invention, FIG. 10 (a) is a figure equivalent to FIG. 4 (a), FIG.10 (b) is a figure equivalent to FIG.4 (b).

DESCRIPTION OF SYMBOLS 1 Pants type disposable diaper 2 Top sheet 3 Back sheet 4 Absorbent core 5 Waist opening 6 Leg opening 71 High wearing pressure area 72 Peripheral area of waist opening 73 Lower area (Leg opening side of high wearing pressure area region)

Claims (3)

An absorbent body including an absorbent core, and an outer packaging material arranged on the non-skin contact surface side of the absorbent body and fixing the absorbent body, and a waist opening and a pair of leg openings are formed A pants-type disposable diaper that has been
The outer packaging material has a structure in which two extensible sheets are laminated, and at least one of the two extensible sheets has elasticity.
A high wearing pressure region in which a stretchable sheet different from the two stretchable sheets is disposed between the waist opening and the leg opening in each of the belly side and the back side of the diaper, or Of the two extensible sheets, the stretchable sheet has a high mounting pressure region in which two or more layers are formed,
The high wearing pressure region is a pants-type disposable diaper in which pressure at the time of wearing the diaper is higher than each of a peripheral region of the waist opening and a region on the leg opening side of the high wearing pressure region.   It is a disposable diaper for infants, and in the unfolded state of the diaper, the distance from the longitudinal center line to the center position of the high wearing pressure region on the abdominal side is 180 to 220 mm, and the back side from the longitudinal center line The pants-type disposable diaper according to claim 1, wherein a distance to a center position of the high wearing pressure region of the portion is 180 to 220 mm.   The high wearing pressure region has a pressure when wearing diapers of 0.8 to 2.5 kPa, and the peripheral region of the waist opening has a pressure of 0.3 to 1.5 kPa when wearing diapers. The pants-type disposable diaper according to claim 1 or 2, wherein the pressure difference between the high wearing pressure region and the peripheral region of the waist opening is 0.5 to 1.0 kPa.

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