JP2006061680A - Pants type disposable diaper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pants type disposable diaper in which the moving and falling down of the diaper hardly occurs due to the movement of a wearer during wearing the diaper. <P>SOLUTION: An area 71 where pressures is 1.1 to 2.5 kPa at the time of wearing the diaper is present between a waist opening portion 5 and leg opening portions 6, respectively in an abdominal side portion A and a back side portion B of the pants type disposable diaper 1. The width of the above area 71 is 15 to 35 mm. The distance from the center line in the longitudinal direction to the center position of the above area of the abdominal side portion A is 180 to 220 mm, and the distance from the center line in the longitudinal to the central position of the above area of the back side portion B is 180 to 220 mm when the diaper 1 is expanded. Pressures at the waist opening portion 5 at the time of wearing the diaper is 0.3 to 1.5 kPa. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a pants-type disposable diaper, and more particularly to a pants-type disposable diaper for infants.

  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 is a pants-type disposable diaper having a waist opening and a pair of leg openings,
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 pressure when wearing the diaper is 1.1 to 2.5 kPa, and the region The width is 15-35 mm,
In the deployed state of the diaper, the distance from the longitudinal center line to the center position of the region on the ventral side is 180 to 220 mm, and the distance from the longitudinal center line to the center position of the region on the back side is 180-220 mm,
The said objective is achieved by providing the underpants type disposable diaper by which the pressure of the said waist opening part at the time of diaper wear is set to 0.3-1.5kPa.

Further, the present invention is a diaper mounting method in which a wearer wears a pants-type disposable diaper having a waist opening and a pair of leg openings,
The diaper which tightens the site | part of the diaper corresponding to the said site | part by a predetermined means so that the mounting pressure of the site | part from a wearer's iliac crest to the upper anterior iliac spine after a diaper installation may be 1.1-2.5kPa. A mounting method is provided.

  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 falling 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, the occurrence of leakage of urine and feces during wearing is suppressed by suppressing the falling of the diaper.

  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 is an exploded perspective view showing a state before the diaper shown in FIG. 1 is assembled. FIG. 3 shows a plan view of the developed state of the diaper in FIG.

  The diaper 1 of the present embodiment has a substantially longitudinal absorption having a liquid-permeable top sheet 2, a water-repellent back sheet 3, and a liquid-retaining absorbent core 4 interposed between the two sheets 2 and 3. The body main body 10 and the outer packaging material 11 arranged on the back sheet 3 side of the absorber main body 10 are provided.

  The outer packaging material 11 has an hourglass shape in which both side edges are bound inward 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 and the back surface sheet 3, the same material as that conventionally used for this type of diaper can be used. The absorbent core 4 is made of superabsorbent polymer particles and a fiber material, and is covered with tissue paper (not shown).

  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. Each side cuff 8 has a fixed end and a free end along the longitudinal direction of the absorbent body 10. The fixed end is fixed to the top sheet 2. Furthermore, the fixed end and the free end are fixed to the topsheet 2 at both ends in the longitudinal direction of the absorbent body 10 (ends in the vertical direction in FIG. 3). On the other hand, a side cuff elastic member 81 is arranged in an expanded state in the vicinity of the free end. 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.

  The outer packaging material 11 has at least two nonwoven fabrics, that is, an outer layer nonwoven fabric 12 and an inner layer nonwoven fabric 13 disposed on the inner surface side of the outer layer nonwoven fabric 12. 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 with an adhesive such as a hot melt pressure-sensitive 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.

  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. The waist elastic members 51, 51 are both elastic members when 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 are joined (joined portions) to each other. The ends of 51 and 51 are arranged so as to overlap each other, or the ends of both elastic members 51 and 51 are continuously arranged up to both joint portions. As a result, as shown in FIG. 1, a substantially continuous ring-shaped waist gather is formed in the vicinity of the waist opening 5 of the diaper 1.

  The outer packaging material 11 extends outward from the front and rear end edges of the absorbent body 10, and the extended portion is folded back to the absorbent body 10 side. The wrapped outer packaging material 11 covers the front and rear end portions of the absorber body 10 (that is, the top sheet 2 at the front and rear end portions of the absorber body 10). Instead of this configuration, only the outer layer nonwoven fabric 12 in the outer packaging material 11 is further extended and extended from the 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. The outer layer nonwoven fabric 12 can be folded back to the absorbent body 10 side.

  Leg elastic members 61a and 61b are disposed on the left and right curved portions of the outer packaging material 11, respectively. 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 by the predetermined joining means in the expansion | extension state. 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. When each leg part elastic member 61a, 61b joins both the side edges A1, A2 of the belly side part A of the diaper 1 and both side edges B1, B2 of the back side part B, the both elastic members 61a, 61b It arrange | positions so that edge parts may overlap, or the edge part of both the elastic members 61a and 61b is continuously arrange | positioned to the both junction part. As a result, as shown in FIG. 1, a substantially continuous ring-shaped leg gather is formed in the vicinity of the leg openings 6, 6 of the diaper 1.

  In the diaper 1, a large number of elastic members extending in the width direction of the diaper 1 are arranged between the waist opening 5 and the leg opening 6 in the stomach side A and the back side B of the diaper 1. By arranging the elastic member, a first region 71 and a second region 72 extending in the width direction of the diaper 1 are formed between the waist opening 5 and the leg opening 6. A first elastic member 71 a is disposed in the first region 71, and a second elastic member 72 a is placed in the second region 72. The first region 71 is located between the waist opening 5 and the leg opening 6, and the second region 72 is located between the first region 71 and the rec opening.

  Both the first elastic member 71a and the second elastic member 72a are sandwiched and fixed between the outer nonwoven fabric 12 and the inner nonwoven fabric 13 in an expanded state. The first elastic member 71a is a first elastic member 71a of the ventral side A when 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 are joined together. And the first elastic member 71a of the back side portion B are arranged so as to overlap each other, or the end portions of the elastic members 71a and 71a are arranged up to both joint portions. The same applies to the second elastic member 72a. As a result, as shown in FIG. 1, gathers are formed in the first region 71 and the second region 72 in the ventral side A and the back side (not shown) of the diaper 1, respectively.

  Both the first elastic member 71 a and the second elastic member 72 a extend between the left and right side edges of the diaper 1 (that is, the left and right side edges of the outer packaging material 11) and the left and right side edges of the absorbent core 4. Yes. And in the site | part in which the absorptive core 4 exists, neither the 1st elastic member 71a and the 2nd elastic member 72a exist substantially. As a result, the gathers formed in the first region 71 and the second region 72 are located between the left and right side edges of the diaper 1 and the left and right side edges of the absorbent core 4, and the absorbent core 4 is present. The position is substantially free of gathers. Thereby, even in the mounted state, the portion where the absorbent core 4 is present does not cause the outer packaging material 11 to contract due to the contraction of the first elastic member 71a and the second elastic member 72a, and the diaper 1 is also visually improved. Also, the absorption performance is good.

  As each elastic member in the diaper 1 of the present embodiment, a stretchable material such as natural rubber, polyurethane resin, urethane foam resin, stretchable nonwoven fabric or hot melt stretchable member is used as a thread (thread rubber) or a strip (flat). (Rubber), net (net) or film is preferably used.

  Thus, in the diaper 1 of the present embodiment, the pressure when the diaper 1 is worn in the first region 71 is 1.1 to 2.5 kPa. The first 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. 4, 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 of 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. 5 shows a state in which the baby's body looks 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 71 is 1.1 to 2.5 kPa. When the pressure at the time of wearing of the diaper 1 in the first region 71 is less than 1.1 kPa, it becomes difficult to fix the first region 71 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, if the pressure when wearing the diaper 1 in the first region 71 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 71 is 1. It is preferably 1 to 2.0 kPa, and more preferably 1.2 to 1.8 kPa.

  The pressure when the diaper 1 is worn in the first region 71 can be controlled by adjusting, for example, the material, thickness, elongation rate, or arrangement interval of the first elastic member 71a.

  The pressure at the time of wearing the diaper 1 in the first region 71 is 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 71]
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 in which the air pack is set 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 (see FIG. 3). 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 to Pn is performed over a range where the left and right side portions of the outer packaging material 11 from the waist opening to the leg opening are joined to each other. 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 at the back side, and the average value is set as the wearing pressure at 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 71. For example, when P3 to P6 are applicable, the width of the region = (6-3) × 5 = 15 mm. The center of the first region 71 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.

  The part from the wearer's iliac crest to the upper anterior iliac spine has a certain width, and the first region 71 of the diaper 1 is fixed to the part within the range of the width. Can be effectively prevented. From this viewpoint, in the diaper 1 of the present embodiment, the width of the first region 71 (that is, the length of the first region 71 along the longitudinal direction of the diaper 1) W1 is set to 15 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 a state where the diaper 1 is worn, the relationship between the dimensions of the diaper 1 and the physique of the wearer in order for the first region 71 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 of the first region 71 of the ventral side A (center position along the longitudinal direction of the diaper 1) and the diaper 1. And the center position of the first region 71 of the back side portion B (the center position along the longitudinal direction of the diaper 1) in a deployed state of the diaper 1 with a distance K1 between the longitudinal center line CL of the diaper 1 and 180 mm By setting the distance K2 between the diaper 1 and the longitudinal center line CL to 180 to 220 mm, the first region 71 can be successfully brought into contact with the wearer's iliac region. 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. 6, the abdominal side left and 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 215 mm, particularly 190 to 215 mm, the first region 71 can be brought into more successful contact with the wearer's iliac region.

  Although the 1st field 71 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. That is, if the pressure at the time of wearing of the 1st field 71 in ventral part A and back part B is 1.1-2.5 kPa, the material of an elastic body, thickness, extension rate, arrangement interval May be different in ventral side A and dorsal side B. However, if the configuration of the first region 71 of the ventral portion A and the back portion 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 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% when A is the greater pressure when the first region 71 is attached to the ventral portion A and the dorsal portion B, and B is the smaller one. 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, for example, as shown in FIGS. 7A and 7B, 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 being joined 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.

  As described above, 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 first elastic member 71 a disposed in the first region 71. In other words, unlike the conventional pants-type diaper, the tightening force by the elastic member disposed in the waist opening 5 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 contrary, it has been confirmed by the present inventors that if the tightening force 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 of the waist opening 5 when wearing the diaper is set to 0.3 to 1.5 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 71 when the diaper is worn. Further, by setting the pressure of the waist opening 5 when 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 of the waist opening 5 can be measured by the same method as the pressure of the first 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. 7A and 7B, when the position of the edge of the waist opening on the abdomen side is shifted from the position of the edge of the waist opening on the back side, Of the region where the side overlaps, the position closest to the end is defined as the waist opening. The pressure of the waist opening 5 can be controlled, for example, by adjusting the material, thickness, elongation rate, or arrangement interval of the waist elastic member 51. When the pressure of the waist opening 5 falls within the pressure range of the first region 71, the position is included in the first region 71.

  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, when the diaper is worn, a region other than the first region 71, the waist opening 5 and the leg opening 6, for example, the first region 71 located between the first region 71 and the leg opening 6. The pressure in the two regions 72 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 72 contacts the lower region (lower abdomen) of the wearer's iliac region. The width of the second region 72 (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.

  In this regard, in the diaper 1, when the pressures of the waist opening 5, the first region 71, and the second region 72 when the diaper is worn are compared, the pressure in the first region 71 is the highest, and then the waist It is preferable that the pressure in the opening 5 is high and the pressure in the second region 72 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.

As is clear from the above description, if the wearing pressure of the wearer's iliac region is 1.1 to 2.5 kPa after the wearing of the pant-type diaper, the diaper slippage is effectively prevented. The One specific means for setting the mounting pressure within such a range is the first elastic member disposed in the first region 71. However, the means is not limited to such an elastic member, and the wearing pressure of the wearer's iliac region may be within the above range by other means. For example, after wearing the diaper, the diaper portion corresponding to the iliac region may be tightened with a belt or the like so that the wearing pressure of the wearer's iliac region is within the above range. That is, the present invention, in addition to the invention of the pants-type disposable diaper described so far, a liquid-permeable surface sheet, a water-repellent back sheet, and a liquid-retaining absorbent core disposed between both sheets, And a pants-type disposable having a waist opening and a pair of leg openings, the outer packaging material disposed on the back sheet side, the left and right side portions of the longitudinal front and rear ends of the outer packaging material being joined to each other In the diaper mounting method in which the diaper is mounted on the wearer, the site is such that the mounting pressure of the site from the wearer's iliac crest to the upper anterior iliac spine is 1.1 to 2.5 kPa after the diaper is mounted. The invention also includes an invention of a diaper mounting method for fastening a diaper part corresponding to the above by a predetermined means.

  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 1 of the embodiment, the first elastic member 71a or the second elastic member 72a is disposed only between the left and right side edges of the diaper 1 and the left and right side edges of the absorbent core 4. However, the elastic members 71a or 72a may be partially overlapped only on the left and right side edges of the absorbent core 4, or may be arranged over the entire length of the diaper in the width direction. In this case, a force of contraction by the first or second elastic member acts on the outer packaging material 11 in a portion overlapping the absorbent core 4. However, even in such a case, the outer packaging material 11 located in the region where the absorbent core 4 is disposed is attached to the absorbent core 4 with an adhesive, so that the elasticity of the elastic member can be obtained using the rigidity of the core 4. Shrinkage can be suppressed and wrinkles can be prevented from occurring in the outer packaging material 11 in the portion where the core 4 is disposed. Also, the first elastic member 71a or the second elastic member 72a sandwiched and fixed between the outer layer and inner layer nonwoven fabrics 12 and 13 should be hardly fixed to the nonwoven fabrics 12 and 13 only at the portion where the absorbent core 4 is arranged. As a result, wrinkles can be prevented from occurring in the outer packaging material 11 in the portion where the core 4 is disposed.

  Moreover, this invention has the area | region where the pressure at the time of diaper wearing is set to 1.1-2.5 kPa between the said waist opening part and the said leg opening part in each of the belly side part and back side part of a diaper. And the width of the region is 15 to 35 mm, the distance from the longitudinal center line CL to the center position of the region on the ventral side is 180 to 220 mm, and the longitudinal center line is in a deployed state of the diaper. If the distance from CL to the center position of the said area | region of a back side is 180-220 mm, and the pressure of the said waist opening part at the time of diaper wear is 0.3-1.5 kPa, If it is a pants type disposable diaper Includes any form. For example, as shown in FIG. 8, a third region 73 may be provided between the waist opening 51 and the first region 71.

  In addition, as shown in FIG. 9, a plurality of first elastic members 71a are arranged across the entire width direction of the diaper in the ventral side A, and the central portion of the first elastic member 71a is directed to the crotch part C of the diaper. And may be curved in a convex shape. Such a curved shape of the first elastic member 71a makes it easier to fit the diaper into the body shape of the infant whose abdomen is protruding. As a result, the vertical displacement of the diaper is less likely to occur.

  Furthermore, as shown in FIG. 10, a plurality of first elastic members 71 a are arranged in the abdominal side A across the entire width direction of the diaper and are located near the crotch C of the diaper. 71a may be curved in a convex shape toward the crotch portion C. In this case, it is preferable to increase the degree of curvature of the first elastic member 71a closer to the crotch part C. With such an arrangement of the first elastic member 71a, a wide range around the abdomen can be covered with the first elastic member 71a. As a result, in addition to the contraction in the left-right direction, the force of contraction in the up-down direction is generated, so that it is possible to prevent the diaper from being displaced in the up-down direction and raise the center part in the width direction of the diaper upward. .

  Furthermore, in this embodiment, both side edges A1, A2 of the ventral side A and both side edges B1, B2 of the back side B are joined together to form a side seal portion. Alternatively, it may be pre-engaged with various engaging members such as 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.

  Furthermore, in the present embodiment, the outer packaging material 11 is composed of the outer layer and the inner layer nonwoven fabrics 12 and 13, but the material of the outer packaging material is not limited thereto, and may be a laminated sheet of a nonwoven fabric and a water repellent sheet, for example.

  Furthermore, in this embodiment, although the diaper 1 was comprised from the outer packaging material 11 which defines the outline of a diaper, and the absorber main body 10 mounted on it, it replaces with this and a surface sheet and The outline of the diaper may be defined by the back sheet, and the absorbent core may be interposed between both sheets. Moreover, you may comprise the site | part extended outward from the right-and-left both sides of the absorptive core in the belly side part and back side part of a diaper from an elastic panel material.

  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.

[Examples 1 and 2 and Comparative Examples 1 to 4]
The underpants type diaper shown in FIG. 1 thru | or FIG. 3 was produced. The surface sheet 2 in the absorbent body 10 was composed of a hydrophilic air-through nonwoven fabric having a basis weight of 25 g / m ² . The back sheet 3 was composed of a polyethylene sheet having a basis weight of 20 g / m ² . Further, the outer layer nonwoven fabric 11 in the outer packaging material 11 was composed of a water-repellent air-through nonwoven fabric having a basis weight of 25 g / m ² , and the inner layer nonwoven fabric was composed of a water-repellent spunbonded nonwoven fabric having a basis weight of 18 g / m ² . The pressure generated by each elastic member was adjusted by changing the type of elastic material and the elongation rate. Table 1 shows each value in the obtained diaper.

The obtained diapers were attached to three 1 to 2 year old infants and evaluated as follows. The results are shown in Table 1.
(1) Operability when wearing (easy to put diapers on)
○: Easy to fold △: Slightly fragile ×: Slightly difficult (2) Position shift of the first area 60 minutes after mounting ○: No position shift △: Slight position shift ×: Position shift slightly (3) 60 minutes after mounting Misalignment of waist opening of ○ ○: No misalignment Δ: Slight misalignment ×: Misalignment (4) Rubber mark in body part corresponding to first region 60 minutes after wearing ○: No rubber mark Δ: Slightly There is rubber mark ×: Rubber seal (5) Positional displacement of the side seal part before and after ○: No positional deviation △: Some positional deviation ×: There is positional deviation

  Further, for the diapers of Example 1 and Comparative Example 1, the main effects of the present invention are “presence / absence of rubber marks in the body part corresponding to the first region 60 minutes after wearing” and “waist opening 60 minutes after wearing” The presence or absence of misalignment was evaluated in detail. Twenty-five infants aged 11 months to 37 months were put on each of these diapers, and the mothers were asked to investigate whether they would support “hard rubber marks” and “difficult to shift”. The results are shown in Table 2.

  As is apparent from the results shown in Table 1, it can be seen that the diaper of each example is easy to break and that the diaper does not easily fall off. In addition, since the diaper of Example 2 has a difference in the shape in the abdominal part and the back part compared with the diaper of Example 1, it was observed that a side seal part shifted | deviated a little to the front side of a body. It was a problem-free level.

  On the other hand, the diaper of Comparative Example 1 corresponds to a conventional pants-type disposable diaper, and the diaper is easily displaced. In the diaper of Comparative Example 2, since the width of the first region was not sufficient, the diaper was easily misaligned. In the diaper of Comparative Example 3, there was no region corresponding to the first region, it was difficult to put on the diaper, and rubber marks were likely to remain. In the diaper of Comparative Example 4, the width of the first region was too large and it was difficult to put on the diaper.

  As is clear from the results shown in Table 2, the diaper of Example 1 has received very high support from the mother regarding the evaluation items of “difficult to leave rubber marks” and “difficult to cause displacement”. I understand. On the other hand, in the diaper of Comparative Example 1, the mother's support is only about half.

It is a perspective view which shows one Embodiment of the underpants type disposable diaper of this invention. It is a disassembled perspective view which shows the state before assembling the diaper shown in FIG. It is a top view which shows the expansion | deployment state of the outer packaging material 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. Fig.7 (a) is a perspective view which shows another embodiment of the diaper of this invention, FIG.7 (b) is a top view which shows the unfolded state of the diaper shown in Fig.7 (a). It is a top view in the unfolded state which shows another embodiment of the diaper of this invention. It is a top view in the unfolded state which shows another embodiment of the diaper of this invention. It is a top view in the unfolded state which shows another embodiment of the diaper of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pants type disposable diaper 2 Top sheet 3 Back sheet 4 Absorbent core 5 Waist opening 6 Leg opening 71 1st area | region 72 2nd area | region

Claims (9)

A pants-type disposable diaper having a waist opening and a pair of leg openings,
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 pressure when wearing the diaper is 1.1 to 2.5 kPa, and the region The width is 15-35 mm,
In the deployed state of the diaper, the distance from the longitudinal center line to the center position of the region on the ventral side is 180 to 220 mm, and the distance from the longitudinal center line to the center position of the region on the back side is 180-220 mm,
A pants-type disposable diaper in which the pressure of the waist opening when wearing a diaper is 0.3 to 1.5 kPa.   The pants-type disposable diaper according to claim 1, wherein the region mainly exists between left and right side edges of the diaper and left and right side edges of the absorber.   3. The pants-type disposable diaper according to claim 1, wherein the region is formed at a site that contacts a site from the wearer's iliac crest to the upper anterior iliac spine when the diaper is worn.   The pants-type disposable diaper according to any one of claims 1 to 3, wherein the region includes an elastic material.   The pants-type disposable diaper according to any one of claims 1 to 4, wherein a pressure of the waist opening when wearing a diaper is lower than a pressure of the region when wearing the diaper.   The underpants type disposable diaper in any one of Claim 1 thru | or 5 by which the pressure of the area | regions other than the said area | region and the said waist opening part at the time of diaper wear is 0.2-0.8 kPa.   The pants-type disposable diaper according to any one of claims 1 to 6, wherein an elastic member is arranged in an extended state along the leg opening.   The pants-type disposable diaper according to claim 7, wherein the pressure in the region other than the region, the waist opening, and the leg opening is 0.2 to 0.8 kPa when the diaper is worn. In a diaper mounting method in which a wearer wears a pants-type disposable diaper having a waist opening and a pair of leg openings,
The diaper which tightens the site | part of the diaper corresponding to the said site | part by a predetermined means so that the mounting pressure of the site | part from a wearer's iliac crest to the upper anterior iliac spine after a diaper installation may be 1.1-2.5kPa. Wearing method.

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