JP5898128B2 - Open disposable diaper - Google Patents

Description

  The present invention relates to an open-type disposable diaper.

  Conventionally, an open-type disposable having a front waistline region, a rear waistline region, and a crotch region, having a pair of leg-hole openings, and having an absorber extending across the crotch region and extending to the front waistline region and the rear waistline region Diapers are known (see, for example, Patent Document 1).

JP 2003-70840 A

  However, in recent years, due to the increase in the number of mothers who have never had diapers in their infants and infants due to the nuclear family and the declining birthrate, it has become clear from where the wearers should wear such disposable disposable diapers. I began to hear the voice of no.

  On the other hand, manufacturers are also making efforts to explain in detail the procedures for wearing open diapers through stores and online tools.

  Applicant pays attention to the current situation, and without reading these wearing procedures etc., the market for open-type disposable diapers where the wearer can easily know where to pull and lift the open-type disposable diaper. I thought there was a high need.

  Then, this invention is made | formed in view of the above-mentioned subject, and it aims at providing the open-type disposable diaper which can be easily and correctly mounted | worn with a wearer.

  The first feature of the present invention includes a front waistline region, a rear waistline region, and a crotch region positioned between the front waistline region and the rear waistline region, and a pair of leg opening portions are formed. And a product longitudinal direction extending from the front waistline region to the rear waistline region, and a product width direction orthogonal to the product longitudinal direction, comprising an absorber extending across the crotch region and extending to the front waistline region and the rear waistline region An open-type disposable diaper having a crotch expansion / contraction portion that is formed in an absorber arrangement region in which the absorber is arranged in the crotch region and that can expand and contract in the product longitudinal direction, and the leg opening A pair of leg stretchable parts that can be stretched at least in the product longitudinal direction, and a waist stretchable part that is formed in the rear waistline and can be stretched in the product width direction, and the crotch stretchable part, Less The absorber core arrangement region, which is surrounded by the stretchable part and the waist stretchable part and in which the absorbent core constituting the absorbent body is placed, is formed so as not to stretch, and the absorbent body in the longitudinal direction of the product The gist of the invention is that the length of the core arrangement region is configured to be longer than half of the length of the crotch stretchable part in the product longitudinal direction.

  As described above, according to the present invention, it is possible to provide an open-type disposable diaper that can be easily and correctly attached to a wearer.

It is an expanded top view of an open type disposable diaper concerning an embodiment of the present invention. It is an expanded top view of an open type disposable diaper concerning an embodiment of the present invention. It is FF sectional drawing of the open-type disposable diaper which concerns on the 1st Embodiment of this invention. It is a figure which shows a mode that the open type disposable diaper which concerns on the 1st Embodiment of this invention is mounted | worn with a wearer. It is a figure which shows a mode that the open type disposable diaper which concerns on the 1st Embodiment of this invention is mounted | worn with a wearer. It is a figure which shows a mode that the open type disposable diaper which concerns on the 1st Embodiment of this invention is mounted | worn with a wearer.

(First embodiment of the present invention)
With reference to FIG. 1 thru | or FIG. 6, the open type disposable diaper 10 which concerns on the 1st Embodiment of this invention is demonstrated.

  In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic and ratios of dimensions and the like are different from actual ones.

  Therefore, specific dimensions and the like should be determined in consideration of the following description. Moreover, the part from which the relationship and ratio of a mutual dimension differ also in between drawings may be contained.

  FIG.1 and FIG.2 is an expanded plan view of the open-type disposable diaper 10 which concerns on this embodiment. FIG. 3 is a cross-sectional view of the open-type disposable diaper 10 taken along the line FF shown in FIG.

  As shown in FIGS. 1 and 2, the open-type disposable diaper 10 has a front waistline region 20, a crotch region 25, and a back waistline region 30. The open-type disposable diaper 10 has a pair of leg openings 35 formed therein.

  Here, the front waistline region 20 is a portion in contact with the wearer's front waistline portion, the back waistline region 30 is a portion in contact with the wearer's back waistline portion, and the crotch region 25 is in contact with the front waistline region 20 and the rear. It is a part located between the waist area 30.

  In the present embodiment, a direction from the front waistline region 20 to the rear waistline region 30 is referred to as a product longitudinal direction L, and a direction orthogonal to the product longitudinal direction L is referred to as a product width direction W.

  The open-type disposable diaper 10 includes an absorbent body 40 that extends over the crotch region 25 and extends to the front waistline region 20 and the rear waistline region 30. As shown in FIG. 3, the absorber 40 is comprised by the absorber core 40a and the core wrap 40b.

  The absorbent core 40a is the same as that used in conventional disposable diapers, and the absorbent core 40a can be appropriately configured using known members and materials such as pulverized pulp and high-absorption polymer. The absorber core 40a is wrapped with a sheet-like core wrap 40b.

  The core wrap 40b is a sheet that covers the absorbent core 40a. At least a part of the core wrap 40b on the skin contact surface side is composed of various fiber nonwoven fabrics or tissue sheets having liquid permeability.

For example, as the member constituting the core wrap 40b, and air-through fibrous nonwoven fabric of weight approximately 10 to 30 g / ^{m 2,} and spunbonded nonwoven fabric, SMS (spunbond - Merutoburon - spunbond) nonwoven fabric and a mass of about 10 to 30 g / m ^Two tissue sheets can be used.

  Further, as shown in FIG. 3, a liquid-permeable top sheet 50 is provided on the surface side (skin contact surface side) of the absorber 40, and the back surface side (non-skin contact surface) of the absorber 40. A liquid-impermeable back sheet 60 is provided on the side). Side flaps 70 are respectively provided on the side edges of the absorbent body 40 in the product width direction W. The side flap 70 is comprised by the nonwoven fabric which piled up the 1 sheet or 2 or more sheets.

  The pair of side flaps 70 in the rear waistline region 30 are each provided with a fastening tape 90. The fastening tape 90 is configured to be attachable to a predetermined region on the non-skin contact surface side of the front waistline region 20.

  The open-type disposable diaper 10 is formed in the crotch region 25 and includes a crotch expansion / contraction portion 200a that can expand and contract in the product longitudinal direction L.

  Specifically, the crotch expansion / contraction part 200 a is disposed in the crotch part 200 formed in the crotch region 25. More specifically, the crotch expansion / contraction part 200a is formed in the absorber arrangement region 300 in which the absorber 40 is arranged in the crotch region 25.

  Further, the center of the crotch stretchable part 200a in the product longitudinal direction L is arranged on the front waistline region 20 side of the center of the open-type disposable diaper 10 in the product longitudinal direction L. However, the crotch expansion / contraction part 200a is arrange | positioned so that the center of the open-type disposable diaper 10 in the product longitudinal direction L may be straddled.

  In the present embodiment, the crotch stretchable part 200a is configured by a stretchable sheet. For example, the stretchable sheet may be a stretchable film formed by melting a thermoplastic elastomer resin such as urethane or styrene, a stretchable nonwoven fabric made of stretchable fibers, a stretchable film or a stretchable nonwoven fabric. A composite sheet or the like obtained by laminating a non-stretchable sheet that has been cut or weakened can be used.

  Further, instead of the stretchable sheet, the crotch stretchable portion 200a may be configured by arranging thread-like / strip-like stretchable elastic members made of polyurethane elastic fiber or natural rubber in parallel with each other.

  In such a case, considering the rigidity of the absorbent core 40a and the rigidity of the other members constituting the open-type disposable diaper 10, the thickness of the elastic member to be used and the pitch to be arranged can be appropriately selected. When in the natural state (non-stretched state), it is preferable that the entire side edge portion in the product width direction W of the absorbent core 40a is in a contracted state.

  Specifically, the expansion / contraction rate of the crotch expansion / contraction part 200a is preferably 1.2 times or more and 1.8 times or less. For example, in this embodiment, the expansion / contraction ratio of the crotch expansion / contraction part 200a may be set to 1.4 times.

  The expansion / contraction rate means the degree of expansion / contraction of the crotch expansion / contraction part 200a in the expansion / contraction direction (product longitudinal direction L in this embodiment), and is defined as follows.

  Expansion rate = (length in the expansion / contraction direction of the crotch expansion / contraction part 200a in the maximum expansion state) / (length in the expansion / contraction direction of the crotch expansion / contraction part 200a in the natural state)

  In addition, in this specification, this expansion / contraction rate shall be measured as follows, for example.

  First, when the open-type disposable diaper 10 is enclosed in a package or the like, the open-type disposable diaper 10 is taken out of the package, and in that state, 20 ° C. ± 2 ° C. and a relative humidity of 60% ± 5% RH. Leave in an atmosphere for 60 minutes.

  Second, the length in the stretch direction of the desired region in such a state (ie, the natural state), and the length in the stretch direction of the desired region when stretched from the natural state to a state where wrinkles by the elastic member cannot be visually confirmed. Measure the thickness.

  Thus, by setting the expansion / contraction rate of the crotch expansion / contraction part 200a to 1.2 times or more and 1.8 times or less, it is possible to suitably follow the expansion and contraction of the wearer's skin.

  For example, when the wearer takes a forward bending posture such that the front side of the body contracts, the skin on the buttocks side of the wearer extends about 30% relative to the stretched body.

  In other words, when the expansion / contraction ratio of the crotch expansion / contraction part 200a is 1.2 times or less, the crotch expansion / contraction part 200a is not sufficiently contracted in the natural state, and compared with a case where the crotch expansion / contraction part 200a is not provided. The difference in the easiness of bending of the diaper 10 is small, and the front waistline region 20 cannot stand up at a desired position.

  On the other hand, if the expansion ratio of the crotch expansion / contraction part 200a is larger than 1.8 times, the contraction dimension in the contraction direction of the crotch expansion / contraction part 200a becomes too large, so that the region where the crotch expansion / contraction part 200a exists is more than along the body. The open disposable diaper 10 is easily displaced downward from the wearer.

  The front surface side (top sheet 50 side) of the absorbent body 40 is formed along the leg opening 35 and includes at least a pair of leg stretchable portions (leg gathers) 75 that can be stretched in the product longitudinal direction L.

  The leg stretchable part 75 is longer than the crotch stretchable part 200a in the product longitudinal direction L, and is provided outside the crotch stretchable part 200a in the product width direction W.

  Moreover, the leg expansion-contraction part 75 is formed with the elastic sheet similarly to the crotch expansion-contraction part 200a. Specifically, the width of the stretchable sheet (the width in the product width direction W in the natural state of the open disposable diaper 10) is preferably 5 mm or more and 35 mm or less at least in the crotch region 25.

  Here, when the width of the stretchable sheet is less than 5 mm, the effect of substantially following the wearer's leg around the surface does not appear, and when the width of the stretchable sheet exceeds 35 mm, the area along the leg circumference. Becomes wider, and the stretchable sheet is easily wound around the wearer's body or turned over.

  The expansion / contraction rate of the leg expansion / contraction part 75 is preferably 1.5 to 2.4 times. For example, in this embodiment, the expansion / contraction rate of the leg expansion / contraction part 75 is set to 1.9 times. The expansion / contraction rate of the leg expansion / contraction part 75 shall be prescribed | regulated similarly to the expansion / contraction rate of the above-mentioned crotch expansion / contraction part 200a.

  Further, the interval between the inner ends of the pair of left and right leg stretchable portions 75 in the product width direction W becomes wider as it goes from the crotch region 25 to the front waistline region 20, and as it goes from the crotch region 25 to the rear waistline region 30. And become wider.

  In addition, this space | interval is the product of the left-right paired leg expansion-contraction part 75, after extending | stretching and hold | maintaining the open-type disposable diaper 10 in the product longitudinal direction L and the product width direction W from the natural state to the state which can not be visually confirmed. The distance between the inner ends in the width direction W is measured.

  The open-type disposable diaper 10 includes a waist stretchable portion (waist gather) 100 that is formed in the rear waistline region 30 and can be stretched in the product width direction W.

  In this embodiment, the waist elastic part 100 is comprised by the elastic sheet similarly to the crotch elastic part 200a and the leg elastic part 75. FIG. The member constituting the waist stretchable portion 100 is not particularly limited, but it is preferable to use a member that is as thin as possible, has low rigidity, and has a small width ratio.

In the present embodiment, a stretchable film having a basis weight of 30 g / m ² is used as the waist stretchable portion 100. Use of such a stretchable film is preferable from the viewpoint of reducing the basis weight.

  The waist stretchable part 100 is stretched by 1.5 to 2.5 times the length in a non-stretched state (natural state), and then adhered to the backsheet 60 by a hot melt adhesive or heat treatment.

  The waist stretchable part 100 is disposed between the top sheet 50 and the back sheet 60. In addition, as shown in FIG. 3, the core wrap 40b may be arrange | positioned between the top sheet 50 and the waist expansion-contraction part 100. FIG.

  Or when the exterior sheet 60a arrange | positioned between the absorber 40 and the back sheet 60 is provided, the waist expansion-contraction part 100 may be arrange | positioned between the exterior sheet 60a and the back sheet 60. FIG.

  Moreover, when the leakproof sheet is intermittently disposed in the product longitudinal direction L, the waist stretchable part 100 may play a role of a leakproof material. In this case, the width of the waist stretchable part 100 is preferably wider than the width of the absorber 40.

  Moreover, the waist expansion-contraction part 100 is comprised so that the width penetration rate in the product longitudinal direction L may be 30% or less when shrink | contracting in the product width direction W. FIG.

  By making the width expansion ratio of the waist stretchable part 100 30% or less, more preferably 10% or less, the shrinkage of the waist stretchable part 100 in the product longitudinal direction L is suppressed, and the waist stretchable part 100 is disposed on the heel part. Further, it is possible to suppress the end portion of the rear waistline region 30 from being shifted from the predetermined position due to the contraction in the product longitudinal direction L.

  In addition, in this specification, this width-inclusive rate shall be measured as follows, for example.

  First, the waist stretchable part 100 is removed from the open-type disposable diaper 10, and the removed waist stretchable part 100 is left in an atmosphere of 20 ° C. ± 2 ° C. and a relative humidity of 60% ± 5% RH for 24 hours. The width of the position corresponding to the center in the product width direction W when the part 100 is placed on the open disposable diaper 10 is defined as a sheet-like elastic element width (WA) in a natural state.

  Secondly, the entire width of the removed waist stretchable part 100 is held on a measuring chuck of a tensile tester (manufactured by Shimadzu Corporation) and attached to an open disposable diaper 10 at a speed of 100 mm / min. The width (WB) of the position corresponding to the center in the product width direction W of the waist stretchable part 100 at the time of placement on the open disposable diaper 10 is measured.

  Then, using the measured (WA) and (WB), the width ratio is calculated by the following equation.

    Width ratio (%) = ((WA) − (WB)) / (WA)) × 100

  Moreover, the absorber core arrangement | positioning area | region 300 is formed so that it may not expand-contract. Here, the absorbent core arrangement region 300 is surrounded by the crotch stretchable portion 200, the leg stretchable portion 75, and the waist stretchable portion 100, and is a region where the absorbent core 40a that constitutes the absorbent body 40 is disposed. .

  In this specification, “the predetermined area does not expand and contract” means that the expansion ratio of the predetermined area along the product longitudinal direction L and the expansion ratio of the predetermined area along the product width direction W are both 1.15 times or less. Means that.

  In the state where the expansion / contraction ratio of the absorbent core arrangement region 300 is 1.15 times or less, the absorbent core arrangement region 300 is substantially wrinkled or uneven due to the shrinkage of the absorbent core 40a. First, the absorbent core arrangement region 300 can be maintained in a state close to a plane without rising.

  The absorbent body 40 has a weight per unit area along end portions in the product longitudinal direction L of the front waistline region 20 and the rear waistline region 30 of the crotch stretchable portion 200a, that is, along an end portion in the product longitudinal direction L of the crotch portion 200. Or low rigidity regions 115 and 125 where the absorber core 40a does not exist.

  According to such a configuration, as shown in FIG. 4 and FIG. 6, in the deployed open disposable diaper 10 in the natural state, along the end in the product longitudinal direction L on the rear waistline region 30 side of the crotch stretchable part 200 a. The crotch region 25 can rise from the region A and the region B along the end in the product longitudinal direction L on the front waistline region 30 side of the crotch stretchable part 200a.

  Further, as shown in FIG. 2, the end E1 on the rear waistline region 30 side of the leg stretchable part 75 is closer to the front waistline area 20 than the end E2 on the crotch region 25 side in the product longitudinal direction L of the waist stretchable part 100. It is configured to be arranged on the side.

  According to such a configuration, as shown in FIGS. 4 and 6, the end E1 of the leg stretchable part 75 in the product longitudinal direction L in the rear waistline region 30 side and the waist stretchable part 100 in the product longitudinal direction L of the waist stretchable part 100 A part of the rear waistline region 30 can rise from the region C between the end E2 and the base portion E2.

  Moreover, as shown in FIG. 2, the absorber core 40a is not arrange | positioned in the area | region 300A between the leg expansion-contraction part 75 and the junction part 81. As shown in FIG.

  According to such a configuration, the presence of the region 300A makes it difficult for the absorbent core arrangement region 300 to be affected by the rise of the leg stretchable portion 75 and to maintain a state close to a plane.

  2, the length L2 of the absorber core arrangement region 300 in the product longitudinal direction L is configured to be longer than half the length L1 of the crotch stretchable part 200a in the product longitudinal direction L. Yes.

  According to such a configuration, the wear assistant uses the absorbent core arrangement region 300 that is maintained in a state close to a plane as a reference position for placing the wearer in the open-type disposable diaper 10 in the natural state that is being deployed. Visually visible.

  Further, a pair of leg side gathers 80 extending along the product longitudinal direction L are provided inside the pair of leg stretchable portions 75 (near the center in the product width direction W).

  The leg side gather 80 includes a joint portion 81 and a free end portion 82 that is located on the opposite side of the joint portion 81 and on which an elastic member (not shown) is disposed.

  Here, the joining portion 81 may be joined to the top sheet 50, or may be joined to the leak-proof film or the back sheet 60 disposed on the non-skin contact surface side with respect to the top sheet 50.

  Further, the end of the free end portion 82 in the product longitudinal direction L is joined to the top sheet 50. The joint portion 81 is disposed between the crotch stretchable portion 200a and the leg stretchable portion 75 in the product width direction W.

  When worn, the leg side gather 80 rises with the joint portion 81 as the base end portion, and the free end portion 82 contacts the wearer's skin with the apex portion.

  In the region of the rear waistline region 30 than the crotch portion 200, the length between the joint portion 81 and the free end portion 82 is configured to be shorter than the joint portion 81, the leg stretchable portion 75, and the length. It may be.

  According to such a configuration, the leg side gather 80 rises at the center side (the absorbent core arrangement region 300 side) in the product width direction W with respect to the leg stretchable portion 75 that stands up, and the leg side gather 80 rises high. However, by being configured to be lower than the rising height of the leg stretchable portion 75, the wearer can more easily focus on the absorbent core arrangement region 300.

  Moreover, the absorber 40 has the low rigidity area | region 110 in which the basis weight is lower than the other site | part of the absorber 40 in the back waist area 30, or the absorber core 40a does not exist.

  In addition, the waist elastic part 100 and the absorber 40 are comprised so that it may overlap at least partially in planar view of the open-type disposable diaper 10. FIG. Specifically, the waist stretchable part 100 is configured to overlap at least a part of the low-rigidity region 110 in a plan view of the open-type disposable diaper 10.

  Further, the low-rigidity region 110 is formed to extend to the vicinity of the end E3 on the rear waistline region 30 side in the product longitudinal direction L of the absorber 40.

  The width of the low-rigidity region 110 in the product width direction W becomes wider toward the end E3 on the rear waistline region 30 side in the product longitudinal direction L of the absorber 40.

  Furthermore, the absorber 40 has the expansion / contraction suppression area | region 120 which is an area | region where the expansion-contraction in the product width direction W was suppressed rather than the other area | region.

  Here, as shown in FIG. 2, the expansion / contraction suppression region 120 is formed outside the low-rigidity region 110 in the product width direction W, respectively.

  More specifically, the shape of the low-rigidity region 110 is a wedge shape in the plan view of the open-type disposable diaper 10.

  In addition, the boundary between the expansion / contraction suppression region 120 and the low rigidity region 110 is formed as an arc that protrudes toward the center in the product width direction W.

  According to this configuration, the wear assistant can be given an image of the shape of the buttocks of the wearer.

  As shown in FIG. 2, the end E4 on the crotch region 25 side in the product longitudinal direction L of the low rigidity region 110 is disposed closer to the crotch region 25 than the tape arrangement region 90A where the fastening tape 90 is provided. Also good.

  An end E5 of the waist stretchable part 100 on the rear waistline region side in the product longitudinal direction L is an end E3 of the absorbent body 40 on the rear waistline region 30 side in the product longitudinal direction L and a product longitudinal direction L of the open disposable diaper 10 You may arrange | position between the edge parts E by the side of the back waist area 30.

  Furthermore, the end portion E2 on the crotch region 25 side in the product longitudinal direction L of the waist stretchable part 100 may extend to the end portion E4 on the crotch region 25 side in the product longitudinal direction L of the low rigidity region 110, or the low rigidity The region 110 may be disposed beyond the end portion E4 on the crotch region 25 side in the product longitudinal direction L.

  Moreover, as shown in FIG. 1, you may be comprised so that the area | region D with the shortest length of the absorber core 40a in the product width direction W may exist in the area | region where the crotch expansion-contraction part 200a is arrange | positioned.

  In the open-type disposable diaper 10, since the crotch expansion / contraction part 200a becomes a bottom part of the open-type disposable diaper 10, the open-type disposable diaper 10 can be mounted along the wearer's body. ing.

  Here, by making the area | region D exist as mentioned above, the bottom part of this open type disposable diaper 10 can be more reliably arrange | positioned in a wearer's crotch part.

  Moreover, as shown in FIG. 1, the center position O2 of the crotch stretchable part 200a in the product longitudinal direction L is arranged closer to the front waistline region 20 than the center position O1 of the open disposable diaper 10 in the product longitudinal direction L. It may be configured.

  The crotch dimension of the human body is larger on the buttocks side than on the abdomen. Therefore, according to the above-described configuration, the wear assistant can easily put the open-type disposable diaper 10 on an appropriate position based on the wearer's crotch dimension.

  Further, as shown in FIG. 2, the length W1 in the product width direction W at the central position O2 of the crotch stretchable part 200a in the product longitudinal direction L is the product width direction W at the end of the crotch stretchable part 200a in the product longitudinal direction L. It may be configured to be shorter than the length W2.

  According to this structure, since the shape seen from the external appearance of the crotch expansion / contraction part 200a is a constricted shape like a crotch part of a female underwear, the wear assistant can put the open disposable diaper 10 on the wearer. When putting it on, the crotch stretchable part 200a is mounted so as to be arranged at the crotch part of the wearer, and it can be visually confirmed that the mounting position is correct.

  Hereinafter, with reference to FIG. 4 thru | or FIG. 6, the method of mounting | wearing a wearer with the open-type disposable diaper 10 is demonstrated.

  First, when the open-type disposable diaper 10 is taken out from the package and the taken-out open-type disposable diaper 10 is expanded, as shown in FIGS. A region A along the end in the product longitudinal direction L on the waistline region 30 side and a region B along the end in the product longitudinal direction L on the front waistline region 20 side of the crotch stretchable part 200a rise from the base point.

  In this case, as shown in FIGS. 4 and 6, a part of the rear waistline region 30 is a product of the end E1 on the rear waistline region 30 side in the product longitudinal direction L of the leg stretchable part 75 and the product of the waist stretchable part 100. Starting from the region C between the end portion E2 on the crotch region 25 side in the longitudinal direction L, the product rises toward the crotch region 25 side in the product longitudinal direction L.

  In addition, since the absorber core arrangement | positioning area | region 300 is formed so that it may not expand-contract, it is maintained in the state near a plane, without standing up.

  Secondly, as shown in FIGS. 4 and 6, the wear assistant (for example, mother) brings the wearer's back portion into contact with a part of the rear waistline region 30 that is standing, and the crotch region 25 that is rising. The open type disposable diaper 10 in a state where the wearer's buttocks are brought into contact with the absorbent core arrangement region 300 between the rear waistline region 30 and the standing waistline 30 is put on the wearer.

  Here, since the wedge-shaped shape of the boundary between the expansion / contraction suppression region 120 and the low-rigidity region 110 can cause the wearer to hold the image of the groove of the wearer's buttocks, As described above, it is sensuous that the groove of the wearer's buttocks should be aligned near the boundary between the expansion / contraction suppression region 120 and the low-rigidity region 110 in the open-type disposable diaper 10 in the natural state as described above. I understand.

  Third, after putting the wearer on the open disposable diaper 10 in the natural state, the front waistline region 20 is folded back as shown in FIG. 5, and the front waistline region 20 and the back waistline region are fastened by the fastening tape 90. By attaching 30, the open disposable diaper 10 is put on the wearer's body.

  According to the open-type disposable diaper 10 according to the present embodiment, when the open-type disposable diaper 10 is developed, as shown in FIGS. 4 and 6, in the natural state, the crotch region 25 includes the region A and the region B. A configuration in which the rear waistline region 30 rises as a base point, a part of the rear waistline region 30 rises from the region C toward the crotch region 25 in the product longitudinal direction L, and the absorber core arrangement region 300 is maintained in a state close to a plane. Therefore, the wear assistant brings the wearer's back part into contact with a part of the rear waistline region 30 that is standing up, and the wearer's buttocks between the crotch region 25 and the absorbent core arrangement region 300 that are standing up By making the contact, the open-type disposable diaper 10 can be accurately attached to the wearer.

  Moreover, according to the open-type disposable diaper 10 which concerns on this embodiment, when a wear assistant makes a wearer wear the open-type disposable diaper 10 with the heel of the crotch expansion-contraction part 200a seen from the external appearance, a crotch expansion-contraction part It is possible to pull up while visually confirming that 200a is appropriately disposed in the crotch part of the wearer.

  That is, if the wear assistant notices that the crotch stretchable part 200a is not properly disposed in the crotch part of the wearer, the wear assistant may also correct the mounting position of the open disposable diaper 10 before stopping the fastening tape. it can.

  As described above, according to the open-type disposable diaper 10 according to the present embodiment, the wearing assistant can easily attach the open-type disposable diaper 10 to the correct position, and therefore, the mounting position of the open-type disposable diaper 10 Induction of leakage due to misalignment can be avoided.

  In addition, the open disposable diaper 10 which concerns on the characteristic of this embodiment described above may be expressed as follows.

  When the open-type disposable diaper 10 according to the feature of the present embodiment is unfolded, in the natural state, at least a part of the rear waistline region 30 rises toward the crotch region 25 side in the product longitudinal direction L, and the crotch region 25 Is bent toward the rear waistline region 30 side of the product longitudinal direction L, and the front waistline region 20 is configured to bend toward the opposite side of the rear waistline region 30 side of the product longitudinal direction L. To do.

  Although the present invention has been described in detail using the above-described embodiments, it is obvious to those skilled in the art that the present invention is not limited to the embodiments described in this specification. The present invention can be implemented as modified and changed modes without departing from the spirit and scope of the present invention defined by the description of the scope of claims. Therefore, the description of the present specification is for illustrative purposes and does not have any limiting meaning to the present invention.

DESCRIPTION OF SYMBOLS 10 ... Open type disposable diaper 20 ... Front waistline area 25 ... Inseam area 30 ... Back waistline area 35 ... Leg circumference opening 40 ... Absorber 40a ... Absorber core 40b ... Core wrap 50 ... Top sheet 60 ... Back sheet 70 ... Side flap 75 ... Leg stretchable part 80 ... Leg side gather 81 ... Joint part 82 ... Free end part 90 ... Fastening tape 100 ... Waist stretchable part 115, 125 ... Low rigidity area 200 ... Crotch part 200a ... Crotch stretchable part

Claims (9)

A front waistline region, a back waistline region, and a crotch region located between the front waistline region and the back waistline region;
A pair of leg hole openings are formed, and the absorbent body extends across the crotch region and extends to the front waistline region and the rear waistline region,
An open-type disposable diaper having a product longitudinal direction from the front waistline region to the rear waistline region and a product width direction orthogonal to the product longitudinal direction,
A crotch expansion / contraction part formed in the absorber arrangement region where the absorber is arranged in the crotch region, and expandable / contractible in the product longitudinal direction,
A pair of leg stretchable parts formed along the leg opening and at least stretchable in the product longitudinal direction;
A waist stretchable portion formed in the rear waistline region and stretchable in the product width direction;
The crotch stretchable part is formed of a stretchable sheet, and is provided inside the leg stretchable part in the product width direction, and the center of the open-type disposable diaper in the product longitudinal direction and the product width direction It is arranged to straddle
The absorber core placement region in which the absorber core that is surrounded by the crotch stretch portion, the leg stretch portion, and the waist stretch portion and that constitutes the absorber is disposed is formed so as not to stretch.
An open-type disposable diaper characterized in that the length of the absorbent core arrangement region in the product longitudinal direction is longer than half of the length of the crotch stretchable part in the product longitudinal direction.   An end of the leg stretchable part on the side of the rear waistline is configured to be disposed closer to the front waistline of the waist than an end of the waist stretchable part on the side of the front waistline. The open type disposable diaper according to claim 1.   The open-type disposable diaper according to claim 1, wherein the waist stretchable part and the absorber are configured to overlap each other. The absorbent body has a low rigidity area where the basis weight is lower than other parts of the absorbent body or the absorbent body core is not present in the rear waistline region,
The waist stretchable part is configured to overlap with at least a part of the low-rigidity region in a plan view of the open-type disposable diaper,
The width of the low-rigidity region in the product width direction is configured to become wider toward an end of the absorber in the product longitudinal direction on the rear waistline side. The open-type disposable diaper according to 1. The absorber has a stretch suppression region that is a region in which expansion and contraction in the product width direction is suppressed compared to other regions,
The open-type disposable diaper according to claim 4 , wherein the expansion / contraction suppression area is configured to be formed outside the low-rigidity area in the product width direction. The shape of the low rigidity region is a wedge shape in a plan view of the open disposable diaper,
The open-type disposable diaper according to claim 5, wherein a boundary between the expansion / contraction suppression region and the low-rigidity region is formed by an arc that protrudes toward the center in the product width direction.   2. The open mold according to claim 1, wherein an area where the length of the absorber core in the product width direction is shortest exists in an area where the crotch stretchable part is disposed. Disposable diapers.   The center position of the crotch expansion / contraction part in the product longitudinal direction is configured to be arranged closer to the front waist region than the center position of the open disposable diaper in the product longitudinal direction. Item 2. An open-type disposable diaper according to item 1.   The length in the product width direction at the center position of the crotch stretchable part in the product longitudinal direction is configured to be shorter than the length in the product width direction at the end of the crotch stretchable part in the product longitudinal direction. The open-type disposable diaper according to claim 1, wherein:

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