JPWO2019069467A1 - Disposable diapers for low weight children - Google Patents

Abstract

A disposable diaper (1) for a low-weight child comprising an absorbent core (2) having a narrow portion at a longitudinal center portion, wherein the folded diaper (1) is developed and extended in the longitudinal direction. In a state where the skin side is pressed down on the upper surface of the table with the skin side down, the board and the weight are placed, and when the natural state is reached, the absorbent core (2) is in the first region (S1) along the upper surface. , A second region (S2) separated upward from the upper surface, and another fold line (FLa) is formed as a boundary between the first region (S1) and the second region (S2). .

Description

  The present invention relates to a disposable diaper for low-weight children.

  Low-birth-weight infants born with low weight often spend their stomach on their wombs. In addition, there is a concept of minimal handling that it is desirable for a low weight child to avoid touching the body as much as possible. Patent Literature 1 discloses a diaper having a cutting line for separating a part of a fastening tape. According to such a diaper, it is possible to minimize contact with the body of a low-weight child at the time of replacement.

JP 2016-120077 A

  The shape of the absorbent core provided in the diaper of Patent Document 1 is a substantially rectangular shape in plan view. Even in the case of a narrow absorbent core for a low-weight child, it is preferable to provide a narrow portion having a width narrower than the end portion in the central portion in the longitudinal direction. Doing so makes it easier for underweight children to move their legs. Moreover, when a low-weight child closes a leg, it can suppress that a skin of a low-weight child is pressed with a highly rigid absorbent core.

  On the other hand, when the narrow portion is provided in the absorbent core, the length of the sheet portion from the side end of the absorbent core to the side end of the diaper increases. If the diaper is loosely worn so that the seat contacts the legs of the low-weight child, the diaper absorbs from the crotch and buttocks of the low-weight child when the seat is pinched between the legs of the low-weight child The core may float.

  Therefore, an object of the present invention is to provide a disposable diaper for a low-weight child, in which the leg can be easily moved by the low-weight child and the fit of the absorbent core to the low-weight child is improved.

A main invention for achieving the above object has a longitudinal direction and a width direction, and has an absorbent core having a narrow portion narrower than an end portion in a central portion in the longitudinal direction, The width at the center of the absorbent core is 15 mm or more and 45 mm or less, and in a packaged state, is a disposable diaper for a low-weight child that is folded in two along a folding line along the width direction, and is folded in two. After pressing the disposable diaper against the upper surface of the table with the skin side down in a state where the disposable diaper is expanded and stretched in the longitudinal direction, a plate of a size that covers the entire surface of the disposable diaper is placed on the disposable diaper. After placing a weight of 1 kg on the board and leaving it for 2 minutes, the weight and the board are removed and when the natural state is set on the upper face, the absorbent core follows the upper face. A first region and a second region that is upwardly separated from the upper surface, and another fold line serving as a boundary between the first region and the second region is formed. This is a disposable diaper for low weight children.
Other features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

  According to the present invention, it is possible to provide a disposable diaper for a low-weight child, in which the low-weight child can easily move the legs and in which the absorbability of the absorbent core is improved.

It is the top view which looked at the diaper 1 developed and extended in the longitudinal direction from the skin side. FIG. 2A is a schematic sectional view of the first waist portion 1A, and FIG. 2B is a schematic sectional view of the crotch portion 1B. 3A to 3C are explanatory diagrams of the diaper 1 in a mounted state. 4A and 4B are explanatory diagrams of a method of packaging the diaper 1, and FIG. 4C is an explanatory diagram of a mounted state of the diaper 1 'of the comparative example. FIG. 3 is a plan view of the absorbent core 2. 6A and 6B are explanatory diagrams of the product length L1. 7A and 7B are explanatory diagrams of an apparent product length L2 and an apparent height H2. FIG. 8A to FIG. 8C are illustrations of an act imitating the act of a nurse or the like, and the diaper 1 thereafter. 9A and 9B are explanatory diagrams of another folding line FLa formed on the diaper 1. FIG.

At least the following matters will become apparent from the description of the present specification and the accompanying drawings.
Having a longitudinal direction and a width direction, at the central portion in the longitudinal direction, comprising an absorbent core having a narrow portion narrower than the end portion, the central width of the absorbent core in the longitudinal direction, 15 mm or more and 45 mm or less, in a packaged state, a disposable diaper for a low-weight child that is folded in half along the folding line along the width direction, wherein the folded disposable diaper is unfolded in the longitudinal direction and In a stretched state, after pressing against the upper surface of the table with the skin side down, a plate large enough to cover the entire surface of the disposable diaper is placed on the disposable diaper, and a 1 kg weight is placed on the plate. After leaving for two minutes, the weight and the plate are removed, and when the natural state is set on the upper surface, the absorbent core is separated from the first region along the upper surface and the upper surface from the upper surface. That the second and a region, the other fold line at the boundary between the first region and the second region is formed, it is a disposable diaper for low weight infants, wherein.

  According to such a disposable diaper for a low weight child, the narrow part of the absorbent core makes it easy for the low weight child to move the leg. Further, since the absorbent core is broken at a plurality of positions different in the longitudinal direction, the absorbent core is likely to bend along the rounded buttocks. Therefore, it is possible to improve the fit of the absorbent core to a low-weight child.

  The disposable diaper for a low-weight child, wherein the separate fold line is formed on both sides of the fold line in the longitudinal direction.

  According to such a disposable diaper for a low-weight child, the absorbent core has many break points, and the absorbent core can more easily follow the buttocks.

  The disposable diaper for a low-weight child, wherein the rigidity in the width direction of the absorbent core 2 in a region including the folding line is 1.1 N or less. It is.

  According to such a disposable diaper for low-weight children, when the legs of the low-weight children are closed, it is possible to prevent the absorbent core from pressing the skin of the low-weight children. Further, another folding line other than the folding line at the time of packaging is easily formed.

In such a disposable diaper, the density of the absorbent core is less than 0.0155 g / cm ³ .

  According to such a disposable diaper, the absorbent core is soft, and another folding line other than the folding line at the time of packaging is easily formed.

  In such a disposable diaper, after the disposable diaper is unfolded and extended in the longitudinal direction, in a natural state where the disposable diaper is placed on the upper surface of a table with the skin side down, the height of the disposable diaper in a direction perpendicular to the upper surface is increased. The length must be less than 70 mm.

  According to such a disposable diaper, the diaper is not easily broken into two along the folding line at the time of packaging, and the absorbent core is easily fitted along the crotch and buttocks of a low-weight child, so that the diaper can be easily worn. Therefore, it is possible to improve the fit of the absorbent core to a low-weight child.

  In such a disposable diaper, the folded foldable disposable diaper, in a state of being developed and extended in the longitudinal direction, is pressed against the upper surface of a table with the skin side down, and then the disposable diaper is placed on the disposable diaper. After placing a plate of a size to cover the entire surface of the disposable diaper, placing a weight of 1 kg on the plate and allowing it to stand for 2 minutes, removing the weight and the plate and allowing it to be in a natural state on the upper surface, The height of the disposable diaper in a direction perpendicular to the upper surface is 60 mm or less.

  According to such a disposable diaper, even a nurse or the like who takes measures such as rubbing the diaper before wearing can be made aware of the good fit of the absorbent core to a low-weight child.

  In such a disposable diaper, the length from the center of the absorbent core to one end of the narrow portion in the longitudinal direction is at least 22% of the longitudinal length of the absorbent core. There is.

  According to such a disposable diaper, the legs of the low-weight child can be easily pulled up by the narrow portion extending in the longitudinal direction.

  In such a disposable diaper, the length from the center of the absorbent core to the other end of the narrow portion in the longitudinal direction is at least 22% of the longitudinal length of the absorbent core. That.

  According to such a disposable diaper, even when the diaper is normally worn or when it is worn back and forth, the legs of the low-weight child can be easily pulled up by the narrow portion extending in the longitudinal direction.

  In such a disposable diaper, both end portions in the width direction of the narrow portion have straight portions along the longitudinal direction.

  According to such a disposable diaper, the width of the absorbent core can be reduced in a wider range in the longitudinal direction, and the leg of a low-weight child can be easily lifted.

  In such a disposable diaper, having a pair of fastening tapes extending from the waist portion on one side in the longitudinal direction to both outer sides in the width direction, in a state where the disposable diaper is expanded and extended in the longitudinal direction, The length in the longitudinal direction from the other end in the longitudinal direction of the disposable diaper to the other end in the longitudinal direction of the narrow portion is the one side in the longitudinal direction of the disposable diaper. The length in the longitudinal direction from an end to the other end in the longitudinal direction of the fastening tape is greater than or equal to the length.

  According to such a disposable diaper, since the narrow portion is not provided beyond the approximate locking position of the fastening tape, that is, beyond the lifting position of the legs of the low-weight child, the narrow portion is unnecessary. It is not long and can secure the absorption capacity of the absorbent core.

  In such a disposable diaper, the narrow portion includes a first fold guide portion, a second fold guide portion, and a third fold guide portion for guiding the absorbent core to bend along the width direction. , Are arranged side by side in the longitudinal direction.

  According to such a disposable diaper, the diaper is three-dimensionally deformed so as to fit a low-weight child who takes a posture when he was in the womb, both when wearing the diaper normally and when wearing it reversely. .

  In such a disposable diaper, the first folding guide portion is disposed on one side in the longitudinal direction more than the second folding guiding portion, and the third folding guiding portion is more than the second folding guiding portion. Disposed on the other side in the longitudinal direction, at least one of the first folding guiding portion and the third folding guiding portion is disposed in a portion where the width of the absorbent core starts to be reduced in the narrow portion. That you are.

  According to such a disposable diaper, the diaper can be folded at the base of the leg on the ventral side of the raised leg of the low weight child, and fits the body of the low weight child. In addition, the width of the absorbent core can be reduced in a wider range in the longitudinal direction, and the leg of a low-weight child can be easily lifted.

  In such a disposable diaper, the absorbent core is symmetrical in the longitudinal direction.

  According to such a disposable diaper, the diaper can be normally worn or can be worn back and forth.

  In such a disposable diaper, a pair of three-dimensional gathers is disposed on both sides in the width direction of the disposable diaper, and the three-dimensional gathers are elastic members for the three-dimensional gathers that expand and contract in the longitudinal direction. The length of the narrow portion in the longitudinal direction is longer than the length of the elastic portion of the elastic member for the three-dimensional gather portion in a state in which the disposable diaper can be raised on the skin side and the disposable diaper is expanded and extended in the longitudinal direction. Is long.

  According to such a disposable diaper, the elastic member for the three-dimensional gather portion can be arranged in the narrow portion, and the standing height of the three-dimensional gather portion can be secured.

=== Embodiment ===
A disposable diaper for a low-weight child is a diaper intended for an infant weighing 3000 g or less (particularly less than 2500 g). Hereinafter, a tape-type disposable diaper to be attached to a low-weight child with a fastening tape will be described as an example of a disposable diaper for a low-weight child. However, the disposable diaper for a low-weight child is not limited to the tape type, and may be, for example, a pad-type disposable diaper without a fastening tape.

<<< Structure of tape-type disposable diaper 1 >>
FIG. 1 is a plan view of a tape-type disposable diaper 1 (hereinafter, referred to as a “diaper”) for a low-weight child that has been developed and elongated in a longitudinal direction, as viewed from the skin side. FIG. 2A is a schematic sectional view of the first waist portion 1A, and FIG. 2B is a schematic sectional view of the crotch portion 1B.

  The diaper 1 has a longitudinal direction and a width direction. The diaper 1 has a first waistline 1A, a crotch 1B, and a second waistline 1C arranged in the longitudinal direction. As shown in FIG. 2A, the direction in which the members constituting the diaper 1 are stacked is referred to as a thickness direction. In the thickness direction, the side in contact with the wearer is called the skin side, and the opposite side is called the non-skin side.

  The diaper 1 includes an absorbent core 2 for absorbing excreted liquid, a liquid-permeable top sheet 3 disposed on the skin side of the absorbent core 2, and a liquid disposed on a non-skin side of the absorbent core 2. An impervious leak-proof sheet 4; an outer sheet 5 arranged on the non-skin side of the leak-proof sheet 4 to form the outer shape of the diaper 1; And a pair of side sheets 6 that extend.

  The absorbent core 2 is formed by molding a liquid absorbent fiber such as pulp fiber containing a highly absorbent polymer (so-called SAP) into a predetermined shape, or a SAP in which a SAP sheet is attached to a hydrophilic sheet. Examples include a sheet and an air-laid sheet in which liquid absorbent fibers are formed into a sheet by an air-laid method. The absorbent core 2 may be covered with a core wrap sheet 2A such as a liquid-permeable tissue paper or a nonwoven fabric.

  A pair of three-dimensional gather portions 8 and a pair of leg elastic members 10 that extend and contract in the longitudinal direction so as to extend along the wearer's leg are arranged on both sides in the width direction of the diaper 1. In the three-dimensional gather portion 8, a part of the side sheet 6 stands on the skin side by the three-dimensional gather portion elastic member 9 which expands and contracts in the longitudinal direction. The excrement is blocked by the three-dimensional gather part 8.

  The leg elastic members 10 are arranged outside the width direction from the rising start points of the three-dimensional gather portions 8 in the width direction (the width direction inner ends of the adhesive (not shown) for bonding the side sheet 6 to the top sheet 3). I have. The diaper 1 fits around the wearer's leg by the leg elastic member 10, and leakage of excrement is suppressed.

  As the elastic member 9 for the three-dimensional gather portion and the leg elastic member 10, a thread-like elastic member such as thread rubber can be exemplified. However, the invention is not limited thereto, and a sheet-like elastic member such as a stretchable film may be used.

  Further, the elastic member 9 for the three-dimensional gather portion and the leg elastic member 10 each have an elastic portion (effective length portion) in which elasticity is developed in the longitudinal direction. Among the three-dimensional gather part elastic member 9 and the leg elastic members 10, the part fixed to the sheet while being extended in the longitudinal direction becomes the elastic part. In the drawing, only the elastic part is shown.

  The diaper 1 has a pair of fastening tapes 7 extending from the first waistline 1A (one waistline in the longitudinal direction) to both outer sides in the width direction. The fastening tape 7 has a tape base 7A and a hook member 7B. The tape base 7A has a substantially rectangular shape that is long in the width direction. The hook member 7B is, for example, a male member of a hook-and-loop fastener, and is provided on the skin side surface of the tape base 7A.

  When the diaper 1 is worn, the diaper 1 in the deployed state is folded in two at substantially the center in the longitudinal direction while being applied to the wearer. Next, both sides in the width direction of the first waist portion 1A are folded inward. Finally, the hook member 7B of the fastening tape 7 is locked to the non-skin side surface of the second waist portion 1C.

  The diaper 1 is for a low-weight child. Therefore, the length of the diaper 1 in the longitudinal direction (product length L1) in a state where the diaper 1 is unfolded and extended in the longitudinal direction is preferably about 175 mm to 330 mm. Specifically, the product length L1 for a body weight of less than 2500 g may be about 310 mm, the product length L1 for a body weight of less than 1500 g may be about 270 mm, and the product length L1 for a body weight of less than 1000 g may be about 230 mm.

  Further, the waist size of the diaper 1 is preferably set to about 160 to 295 mm. Specifically, the waist size for a body weight of less than 2500 g is preferably 273.5 mm, and the waist size for a body weight of less than 1500 g is about 220 mm. The waist dimension was such that the product was stretched without wrinkles in the width direction with the front end in the width direction of one fastening tape 7 being aligned with the end in the width direction of the hook member 7B of the other fastening tape 7. The dimensions in the state.

<<< diaper 1 reverse mounting>
3A to 3C are explanatory diagrams of the diaper 1 in a mounted state. There is a view that it is desirable that low-weight infants who give birth with a weight of less than 2500 g, especially in low-birth weight infants, spend their time in a prone position while in the womb. The posture when in the womb was that the back was rounded in a C shape as shown in FIG. 3A, and the legs were opened in an M shape as shown in FIG. It is in a state where it is. Hereinafter, such a posture is also referred to as a “bent prone posture”.

  In addition, there is a concept of minimal handling that it is desirable that the body of a low-weight child should not touch the body as much as possible.

  Therefore, when the diaper 1 is replaced, the diaper 1 may be replaced with a low-weight child who remains prone by passing the diaper 1 between legs of the low-weight child who is prone without turning the low-weight child on his back. Therefore, as shown in FIG. 3A, the first waist portion 1A provided with the fastening tape 7 is not only mounted in a normal manner so as to cover the back side, but also as shown in FIG. 3B, the first waist portion 1A. There is a case in which the front and rear mounting is performed so as to cover the ventral side. In the case of reverse mounting, it is not necessary to put a hand under the abdomen of a prone low-weight child to lock or remove the fastening tape 7.

  Further, a cutting line 11 for cutting a part of the first waist portion 1A to which the fastening tape 7 is fixed may be provided in the diaper 1. By doing so, removal of the diaper 1 from a low-weight child becomes easy.

<<< Diaper 1 for low-weight children >>
4A and 4B are explanatory diagrams of a method of packaging the diaper 1. FIG. FIG. 4C is an explanatory diagram of a mounted state of the diaper 1 ′ of the comparative example. FIG. 5 is a plan view of the absorbent core 2. 6A and 6B are explanatory diagrams of the product length L1. 7A and 7B are explanatory diagrams of an apparent product length L2 and an apparent height H2. 6A and 7A are schematic perspective views of the diaper 1 during measurement, and FIGS. 6B and 7B are schematic cross-sectional views of the diaper 1 during measurement.

  The diaper 1 is folded in two by a folding line FL along the width direction in a packaged state. Specifically, as shown in FIG. 4A, after both sides in the width direction of the diaper 1 are folded inward in the width direction, as shown in FIG. It is packaged in a folded state.

Here, the “product length L1”, “apparent product length L2”, and “apparent height H2” of the diaper 1 are defined.
The “product length L1” is the length L1 of the diaper 1 in the longitudinal direction when the diaper 1 folded in two is unfolded and extended in the longitudinal direction (see FIGS. 1, 6A, and 6B).
The “apparent product length L2” refers to the length L2 in the longitudinal direction of the diaper 1 in a natural state in which the diaper 1 is unfolded and extended in the longitudinal direction, and then placed on the upper surface of the diaper 1 with the skin side down. (See FIGS. 7A and 7B).
The “apparent height H2” is the height of the diaper 1 in a direction perpendicular to the upper surface of the table in the natural state (FIGS. 7A and 7B).

  The state in which the diaper 1 is unfolded in the longitudinal direction is a state in which the two folds at the time of packaging are open. The state in which the diaper 1 is elongated in the longitudinal direction is a state in which the diaper 1 is elongated in the longitudinal direction such that wrinkles generated in the diaper 1 are not substantially visually recognized. More specifically, the diaper 1 is in a state where the diaper 1 is extended until the length in the longitudinal direction of each member (for example, the side sheet 6 or the like) constituting the diaper 1 is equal to or close to the length in the longitudinal direction of the member alone. .

  The following method can be exemplified as a method for measuring the product length L1, the apparent product length L2, and the apparent height H2. First, the diaper 1 folded in two is taken out of the package. Then, marks M1 and M2 are provided at the center in the width direction of both ends 1a and 1b in the longitudinal direction of the diaper 1, respectively.

  Next, the diaper 1 is fixed to the upper surface 30a (horizontal surface) of the test table 30 in a state where the diaper 1 is developed and extended in the longitudinal direction (see FIG. 6A). At this time, the non-skin side 1c of the diaper 1 is turned up, and the skin side 1d of the diaper 1 is turned down (facing the test stand 30). The longitudinal direction of the diaper 1 is aligned with the X direction of the upper surface 30a of the test table 30. In this state, the length in the X direction from the one end 1a (mark M1) to the other end 1b (mark M2) in the longitudinal direction of the diaper 1 (the length of the diaper 1 in the longitudinal direction) is measured. The measured length is referred to as “product length L1”.

  Next, the extended state in the longitudinal direction is released from the above state, and the diaper 1 is brought into a natural state (see FIG. 7A). The diaper 1 has a three-dimensional gather portion elastic member 9 and leg elastic members 10. The diaper 1 has a folding line FL at the time of packaging. Therefore, in the natural state of the diaper 1, the two elastic members 9, 10 contract, and the central portion in the longitudinal direction of the diaper 1 rises like a mountain. In this state, the length in the X direction from the one end 1a (mark M1) to the other end 1b (mark M2) in the longitudinal direction of the diaper 1 (the length of the diaper 1 in the longitudinal direction) is measured. The measured length is referred to as “apparent product length L2”. The length from the upper surface 30a to the vertex 1e of the diaper 1 in a direction perpendicular to the upper surface 30a of the test table 30 is referred to as "apparent height H2".

  The fact that the apparent product length L2 is smaller than the product length L1 and the value obtained by dividing the apparent product length L2 by the product length L1 (L2 / L1) is smaller means that the height of the diaper 1 at the center in the longitudinal direction is higher. (Apparent height H2) is increased. That is, the diaper 1 is easily broken into two in a natural state.

  Conversely, an increase in the value (L2 / L1) obtained by dividing the apparent product length L2 by the product length L1 means that the height of the mountain (apparent height H2) at the central portion of the diaper 1 in the longitudinal direction decreases, That is, the state in which the diaper 1 is deployed in the longitudinal direction is easily maintained.

  Here, the shape of the absorbent core 2 of the diaper 1 of the present embodiment will be described. As shown in FIG. 5, the absorbent core 2 has a narrow portion 2 </ b> A at the center in the longitudinal direction, which is narrower than the ends. Further, the width W1 of the center CL of the absorbent core 2 in the longitudinal direction (the center CL bisecting the absorbent core 2 in the longitudinal direction) is set to 15 mm or more and 45 mm or less.

  In the case of the absorbent core 2 of the present embodiment, a pair of notches 22b (details will be described later) are arranged at the center CL in the longitudinal direction. Therefore, the length W1 in the width direction between the vertices of the pair of notches 22b is 15 mm or more and 45 mm or less. Further, the width W2 of the absorbent core 2 near the notch 22b is also 15 mm or more and 45 mm or less.

  By setting the width W1 (W2) of the center CL in the longitudinal direction of the absorbent core 2 to 15 mm or more, the absorbing ability of the absorbent core 2 can be secured, and urine leakage can be prevented. On the other hand, by providing the absorbent core 2 with the narrow portion 2A and making the width W1 (W2) of the center CL in the longitudinal direction of the absorbent core 2 45 mm or less, the absorbent core applied to the crotch of a low-weight child 2 becomes narrower. Therefore, a low-weight child can easily move the legs. Further, when the low-weight child closes the leg, it is possible to prevent the absorbent core 2 having high rigidity from pressing the skin of the low-weight child.

  However, when the absorbent core 2 is provided with the narrow portion 2A, as shown in FIG. 1, the sheet portion around the leg from the side end of the absorbent core 2 to the side end of the diaper 1 in the width direction (the back sheet 5 or the like). The length W3 of the side sheet 6 and the like becomes longer. Since the length W3 of the seat portion around the leg is long, the height of the three-dimensional gather portion 8 can be secured. However, if the diaper 1 is loosely fitted to the extent that the seat around the leg contacts the leg of the low-weight child, the crotch of the low-weight child may occur when the seat around the leg is pinched by the leg of the low-weight child. There is a possibility that the absorbent core 2 may float from the buttocks and buttocks.

  Therefore, the value (L2 / L1) obtained by dividing the apparent product length L2 by the product length L1 may be increased. If the value (L2 / L1) obtained by dividing the apparent product length L2 by the product length L1 is reduced and the diaper 1 is easily broken into two at the folding line FL at the time of packaging, the absorbent core 2 floats from a low-weight child. This is because the diaper can be easily worn in the folded state.

  This is because a nurse or the like who wears a diaper on a low-weight child places the diaper under the low-weight child or releases the hand through the diaper between the legs of the low-weight child, and then the diaper becomes Because it breaks into two. Then, it is difficult for the absorbent core 2 to follow the crotch and buttocks of the low-weight child, and the diaper 1 'is worn in a state where the diaper 1' is folded in two at the folding line FL at the time of packaging as shown in FIG. 4C. That is, the absorbent core 2 is mounted in a state of being floated from a low weight child.

  Table 1 shows the results obtained by changing the value (L2 / L1) obtained by dividing the apparent product length L2 by the product length L1, and evaluating the fit of the absorbent core 2 to a low-weight child.

  Five types of samples 1 to 5 were prototyped. The product length L1 and apparent product length L2 of each sample 1 to 5 were measured, and a value (L2 / L1) obtained by dividing the apparent product length L2 by the product length L1 was calculated. In addition, the subject actually mounted each sample 1 to 5 on a doll imitating a low-weight child, and evaluated the fit.

  The specifications of Samples 1 to 5 are as follows. The expansion ratio of the elastic member 9 for the three-dimensional gather portion is 1.99 times for the sample 1, 1.85 times for the sample 2, 1.55 times for the sample 3, 1.46 times for the sample 4, and 1.46 times for the sample 5. The elastic member 9 for gathers was not provided. The extension ratio is a degree of elongation when the natural length of the elastic member is set to 1, and indicates the strength of expansion and contraction of the elastic member. The rigidity of the absorbent core in the longitudinal direction was high for samples 1 to 3 (hard) and low for samples 4 to 5 (soft). Samples 1 to 4 had the leg elastic members 10, and sample 5 did not have the leg elastic members 10. The product length L1 was 240 mm for samples 1 to 3 and 230 mm for samples 4 to 5.

  The evaluation of the fit was performed by the subject visually observing the doll equipped with each of the samples 1 to 5, or touching the buttocks of the doll from above the sample. The subject rated the sample that felt that "the floating of the absorbent core 2 from the doll was small and the fit was good" was evaluated as "O", and "the float of the absorbent core 2 from the doll was large and the fit was good." A sample which felt “not present” was evaluated as “×”.

  From the results of Table 1, in samples 1 and 2 in which the value obtained by dividing the apparent product length L2 by the product length L1 is 0.52 and 0.69, the fit of the absorbent core 2 to a low-weight child is not good. I understood. On the other hand, in samples 3 to 5 in which the value obtained by dividing the apparent product length L2 by the product length L1 was 0.72, 0.79, and 1, it was found that the absorbability core 2 had a good fit to a low-weight child. .

  Therefore, in the diaper 1 of the present embodiment for low-weight children, the value obtained by dividing the apparent product length L2 by the product length L1 is set to 0.7 or more and 1 or less (0.7 ≦ L2 / L1 ≦ 1).

  By doing so, the diaper 1 is not easily broken into two along the folding line FL at the time of packaging, and the state in which the diaper 1 is developed in the longitudinal direction is easily maintained. Therefore, when the diaper 1 is worn, the nurse or the like lays the diaper 1 under the low-weight child or passes through the diaper 1 between the legs of the low-weight child in a prone position, so that the diaper 1 remains in a long position. It tends to be deployed in the direction. For this reason, it becomes easy to wear the diaper 1 while the absorbent core 2 follows the crotch and buttocks of a low-weight child. Therefore, even if the length W3 (see FIG. 1) of the seat portion around the leg is long, the floating of the absorbent core 2 from the crotch and buttocks of the low weight child can be suppressed, and the absorbent core 2 fits the low weight child. Performance can be improved.

  By suppressing the floating of the absorbent core 2 in this way, excreted urine is absorbed by the absorbent core 2 without passing through the skin of a low-weight child. Therefore, it is possible to prevent the skin of a low-weight child from being stimulated by excreted urine.

  In addition, in the bent prone position peculiar to the low-weight child, the position of the heel of the low-weight child's leg is adjusted to the position of the buttocks of the low-weight child estimated from the outside of the diaper 1. Therefore, as shown in FIG. 4C, if the absorbent core 2 floats from the buttocks of the low-weight child, the lifting of the legs of the low-weight child becomes insufficient. Therefore, by suppressing the floating of the absorbent core 2, the leg of the low-weight child can be pulled up to an appropriate position.

  In addition, since the diaper 1 is easily maintained in the longitudinally expanded state, when the diaper 1 is worn, the diaper 1 can be smoothly passed between the legs of a prone low-weight child, and the wearability is improved. Good. In addition, after a nurse or the like spreads the diaper 1 under the low-weight child, or releases the hand through the diaper 1 between the legs of the prone low-weight child, the diaper 1 is hard to break into two patterns. Therefore, it is possible to prevent the diaper 1 that is folded in two from stimulating the skin of a low-weight child.

  Table 2 shows the results of evaluating the fit of the absorbent core 2 to low-weight children by changing the apparent height H2. Four types of samples 6 to 9 were prototyped, and the apparent height H2 was measured. Then, the subject actually mounted each sample 6 to 9 on a doll imitating a low-weight child, and evaluated the fit.

  The specifications of Samples 6 to 9 are as follows. The expansion ratio of the elastic member 9 for the three-dimensional gather portion was 1.99 times for the sample 6, 2.17 times for the sample 7, 2.10 times for the sample 8, and 1.46 times for the sample 9. The rigidity of the absorbent core 2 in the longitudinal direction was high (hard) for Samples 6 to 7 and low (soft) for Samples 8 to 9. The product length L1 was 240 mm for samples 6 and 8, 175 mm for sample 7, and 230 mm for sample 9. In addition, all the samples 6 to 9 had the leg elastic members 10.

  The evaluation of the fit is the same as the evaluation method in Table 1. That is, the doll on which each of the samples 6 to 9 was attached was evaluated in two steps by visually observing the doll or touching the buttocks of the doll from above the sample.

  From the results in Table 2, it was found that in Samples 6 to 7 in which the apparent height H2 was 81.7 mm and 70 mm, the absorbability of the absorbent core 2 to low-weight children was not good. On the other hand, in the samples 8 to 9 having the apparent heights H2 of 51 mm and 45 mm, it was found that the absorbent core 2 had good fit to low-weight children.

  Therefore, in the diaper 1 for low-weight children, the apparent height H2 may be less than 70 mm (H2 <70 mm). The fact that the apparent height H2 is low means that the diaper 1 does not easily break into two at the folding line FL at the time of packaging, and when the diaper 1 is worn, the absorbent core 2 is placed along the crotch and buttocks of a low weight child, The diaper 1 can be easily worn. Therefore, the fit of the absorbent core 2 to a low-weight child can be improved.

  Further, in the diaper 1 for a low-weight child, the extension ratio of the elastic member 9 for the three-dimensional gather portion may be smaller than the extension ratio of the leg-hole elastic member 10.

  In a natural state, the diaper 1 is curved with the skin side inward due to the contraction of the elastic members 9 and 10. The elastic member 9 for the three-dimensional gather portion located on the inner side in the width direction has a greater influence on the deformation of the diaper 1 than the leg elastic member 10. Therefore, by setting the above-described stretching magnification, the curvature of the diaper 1 can be suppressed, and the diaper 1 is less likely to be broken into two at the folding line FL at the time of packaging.

  Further, when the rigidity in the longitudinal direction of the absorbent core 2 is high and the expansion ratio of the elastic member 9 for the three-dimensional gather portion is high, the diaper 1 is bent at an acute angle at the folding line FL at the time of packaging when the state shown in FIG. As the user stands up, the apparent height H2 increases. Therefore, as shown in the results of Tables 1 and 2, the longitudinal rigidity of the absorbent core 2 is reduced and the absorbent core 2 is softened, while the elongation ratio of the elastic member 9 for the three-dimensional gather portion is reduced. Good to do. By doing so, the value (L2 / L1) obtained by dividing the apparent product length L2 by the product length L1 can be increased, the apparent height H2 can be reduced, and the diaper 1 is less likely to be broken into two.

  Specifically, the extension ratio of the elastic member 9 for the three-dimensional gather portion may be set to be 1.3 times or more and 2.1 times or less. By reducing the stretching magnification to 2.1 times or less, the diaper 1 does not easily break into two. On the other hand, by setting the stretching magnification to 1.3 times or more, the three-dimensional gather portion 8 can be erected and leakage of excrement can be suppressed.

  Further, by setting the stretching magnification to 2.1 times or less, the standing of the three-dimensional gather portion 8 can be appropriately suppressed. By doing so, even if the diaper 1 is worn loose enough so that the three-dimensional gather portion 8 comes into contact with the low-weight child, the floating of the absorbent core 2 from the low-weight child can be suppressed.

  The measurement of the expansion ratio of the elastic members 9 and 10 may be performed by a known method. For example, in the diaper 1 in the natural state, the length H0 in the longitudinal direction of the elastic part (the part fixed to the sheet in the extended state) of the elastic member to be measured is measured. Next, in a state where the diaper 1 is extended in the longitudinal direction so that wrinkles generated in the diaper 1 cannot be visually recognized, the longitudinal length H1 of the elastic portion of the elastic member is measured. Then, a value obtained by dividing the length H1 by the length H0 is set as an extension ratio (extension ratio = H1 / H0).

<< Reduction of folding line FL at the time of packaging >>
8A to 8C are explanatory views of an act imitating an act of a nurse or the like, and the diaper 1 thereafter. 8A and 8B are schematic perspective views of the diaper 1, and FIG. 8C is a schematic sectional view of the diaper 1. 9A and 9B are explanatory diagrams of another folding line FLa formed on the diaper 1, and are schematic cross-sectional views of the diaper 1. FIG.

  As described above, when the diaper 1 is easily broken into two at the folding line FL at the time of packaging, the absorbent core 2 is easily lifted from a low-weight child. In addition, even when the folding line FL at the time of packaging has a strong folding habit, the absorbent core 2 can easily float from a low-weight child. If the folding habit is strong, the fold line FL of the diaper 1 is bent at an acute angle and protrudes outward as in the diaper 1 'of the comparative example in FIG. 4C. Therefore, the absorbent core 2 does not easily follow the rounded buttocks and floats.

  However, in hospitals and the like, there are cases where a nurse or the like unfolds the diaper 1 in the longitudinal direction after removing the diaper 1 for a low-weight child from the package, and confirms adhesion of dust. In addition, a nurse or the like may rub the diaper 1 before wearing by hand so that the diaper 1 becomes soft. At this time, the folding habit of the folding line FL at the time of packaging is reduced.

  Furthermore, in the diaper 1 of the present embodiment, when a nurse or the like performs an action such as rubbing the diaper 1, another fold line FLa other than the fold line FL at the time of packaging is formed on the diaper 1. .

  The diaper 1 may be set as follows, imitating the action of a nurse or the like. First, the folded diaper 1 taken out of the package is pressed against the upper surface 30a of the test table 30 in a state where the diaper 1 is unfolded and elongated in the longitudinal direction as shown in FIG. 8A. At this time, the non-skin side 1c of the diaper 1 is turned up, and the skin side 1d is turned down. Then, a plate 31 having a size to cover the entire surface of the diaper 1 is placed on the diaper 1, and a 1 kg weight 32 is placed on the plate 31 and left for 2 minutes. Thereafter, the weight 32 and the plate 31 are removed, and the diaper 1 is brought into a natural state on the upper surface 30a of the test stand 30 (FIGS. 8B and 8C).

  In its natural state, the absorbent core 2 includes a first region S1 along the upper surface 30a of the test table 30 and a second region S2 separated upward from the upper surface 30a of the test table 30, as shown in FIG. 9A. Shall be provided. The diaper 1 is formed with another folding line FLa which is a boundary between the first area S1 and the second area S2. Another fold line FLa is a fold line that folds the absorbent core 2 along the width direction, similarly to the fold line FL at the time of packaging.

  In addition, that the absorbent core 2 is along the upper surface 30a of the test stand 30 means that the absorbent core 2 is in contact with the upper surface 30a of the test stand 30 via the top sheet 3 or the like. Therefore, when the diaper stands up at the folding line FL at the time of packaging at an acute angle, that is, only at the boundary between the region where the absorbent core 2 is present and the sheet portions 3, 4, and 5 outside the longitudinal direction therefrom. When the fold line is formed, it is not included.

  By attaching the diaper 1 on which the folding line FL at the time of packaging and another folding line FLa are formed to a low-weight child, the absorbent core 2 is folded along the width direction at the plurality of folding lines FL and FLa. That is, the absorbent core 2 breaks at a plurality of different positions in the longitudinal direction. Therefore, it is possible to prevent only the fold line FL at the time of packaging from protruding as in the diaper 1 ′ of the comparative example of FIG. 4C, and the absorbent core 2 is curved along the rounded buttocks. Therefore, the fit of the absorbent core 2 to a low-weight child can be improved.

  By improving the fit of the absorbent core 2, excreted urine can be prevented from irritating the skin of the low-weight child without passing through the skin of the low-weight child. Also, when the posture is specific to a low-weight child, the position of the heel of the leg can be adjusted to the correct position of the buttocks of the low-weight child, and the leg can be pulled up to an appropriate position.

  In summary, in the diaper 1 of the present embodiment, the absorbent core 2 has the narrow portion 2A, the length W3 of the seat portion around the leg (see FIG. 1) is long, and the low-weight child closes the leg. The absorbent core 2 may float when it is pressed. However, since another folding line FLa is formed in the diaper 1, the absorbent core 2 easily follows the buttocks of the low-weight child, and the floating of the absorbent core 2 from the low-weight child can be suppressed.

  In the diaper 1 after the act imitating the act of a nurse or the like (FIG. 8A), as shown in FIG. 9A, different fold lines FLa are formed on both sides of the mountain folded at the fold line FL at the time of packaging. Good to be. In addition, as shown in FIG. 9B, the peak folded at the folding line FL at the time of packaging is tilted to one side, and the absorbent core 2 on the side opposite to the side where the peak is tilted is separated upward from the upper surface 30 a of the test table 30. Alternatively, another folding line FLa may be formed only on the side where the mountain is inclined.

  However, as shown in FIG. 9A, it is preferable that another folding line FLa is formed in two places. Since there are many bending origins of the absorbent core 2, the absorbent core 2 is more easily fitted along the rounded buttocks, and the fit of the absorbent core 2 to a low-weight child is improved.

  Further, the rigidity of the absorbent core 2 may be reduced so that the absorbent core 2 is soft so that another folding line FLa is formed on the diaper 1. Specifically, the rigidity of the absorbent core 2 in the longitudinal direction and the width direction is preferably set to 1.1 N or less. By doing so, another folding line FLa is easily formed on the diaper 1.

  Table 3 shows the results of evaluating the ease of closing the legs of low-weight children by changing the rigidity of the diaper 1 in the width direction. Four types of samples 10 to 13 were prototyped, and the stiffness of the diaper 1 in the longitudinal direction, that is, the width direction stiffness of a region straddling the folding line FL at the time of packaging was measured. Then, the subject actually mounted each of the samples 10 to 13 on the doll imitating a low-weight child, and evaluated the ease of closing when closing the legs of the doll.

  The specifications of Samples 10 to 13 are as follows. The absorbent core of Sample 10 was formed by stacking two layers of an airlaid sheet, and had a width of 25 mm. The absorbent core of Sample 11 was formed by stacking two layers of an airlaid sheet and had a width of 40 mm. The absorbent core of Sample 12 was a one-layer airlaid sheet with a width of 35 mm. The absorbent core of Sample 13 was obtained by laminating pulp fibers, and had a width of 35 mm.

  Subjects evaluated the ease of closing the legs on a three-point scale. Specifically, a sample that felt that "the doll's legs were hard to close and the diaper exerted a strong force on the doll" was evaluated as "x", and "the doll's legs were easy to close and the diaper was strong on the doll. The sample which felt that "the doll was not applied" was evaluated as "O", and the sample which felt that "the doll's legs were very easy to close and little force was applied from the diaper to the doll" was evaluated as "◎".

  From the results in Table 3, it was found that in the samples 10 to 11 having the rigidity in the width direction of 1.145 N and 1.103 N, it was difficult to close the legs of the doll. On the other hand, it was found that in the sample 12 having the rigidity in the width direction of 0.861 N, the legs of the doll were easily closed. In addition, in the case of Sample 13 having a rigidity of 0.298 N in the width direction, it was found that the legs of the doll were very easy to close.

  Therefore, the rigidity in the width direction of the absorbent core 2 in the region including the folding line FL at the time of packaging may be set to 1.1 N or less. By doing so, when the legs of the low-weight child wearing the diaper 1 are closed, it is possible to prevent the absorbent core 2 having high rigidity from pressing the skin of the low-weight child. At the same time, another fold line FLa other than the fold line FL at the time of packaging is easily formed on the diaper 1 including the absorbent core 2 having low rigidity. Accordingly, the absorbent core 2 is more easily fitted along the rounded buttocks, and the fit of the absorbent core 2 to a low-weight child is improved.

  The stiffness of the absorbent core 2 may be measured by a known method, and the following method can be exemplified. First, the diaper 1 expanded and extended in the longitudinal direction is folded at the side end of the absorbent core 2 in the width direction. Then, the side end of the absorbent core 2 is extended from the test table. In addition, the terminal of the digital force gauge is set so as to be in contact with the central portion in the longitudinal direction of the side end of the absorbent core 2 (that is, the region across the folding line FL at the time of packaging). Then, the terminal of the digital force gauge is moved about 5 mm inward of the diaper 1 in the width direction. The maximum value (compression force) when the terminal pushes the absorbent core 2 is defined as the rigidity value of the absorbent core 2 in the width direction.

Further, the density of the absorbent core 2 is preferably less than 0.0155 g / cm ³ . By doing so, the absorbent core 2 becomes soft. Therefore, when a nurse or the like rubs the diaper 1, another folding line FLa is easily formed on the diaper 1 (absorbent core 2), and the absorbent core 2 is easily along the rounded buttocks.

In particular, the density of the center CL in the longitudinal direction of the absorbent core 2, that is, the density of the portion of the absorbent core 2 where the folding line FL is formed at the time of packaging is preferably less than 0.0155 g / cm ³ . By doing so, the folding habit of the folding line FL at the time of packaging is less likely to be attached to the absorbent core 2. In addition, when a nurse or the like rubs the diaper 1, the folding habit is easily alleviated. Therefore, it is possible to prevent the fold line FL from protruding at the time of packaging like the diaper 1 ′ of the comparative example of FIG. 4C, and the absorbent core 2 is easily formed along the rounded buttocks.

The density of the absorbent core 2 may be measured by a known method. For example, a measurement target site is cut out from the absorbent core 2 and the basis weight (g / cm ² ) and the thickness (cm) are measured. The density (g / cm ³ ) is calculated by dividing the grammage (g / cm ² ) by the thickness (cm). The thickness is measured, for example, by using a dial thickness gauge ID-C1012C manufactured by Mitutoyo Corporation or equivalent, and setting the contact pressure to 3 gf / cm ² to pressurize the target part to measure. Can be illustrated.

  Although details will be described later, the absorbent core 2 includes a plurality of folding guide portions 21a to 21c (a pair of notches 22a to 22c) for guiding the absorbent core 2 to bend along the width direction. They are provided at different positions in the longitudinal direction.

  Therefore, when the nurse or the like rubs the diaper 1 or the like, the absorbent core 2 is easily broken at the folding guide portions 21a to 21c, and another folding line FLa other than the folding line FL at the time of packaging is easily formed on the diaper 1. . Therefore, the absorbent core 2 can easily follow the rounded buttocks.

  Furthermore, assuming a case where a nurse or the like rubs the diaper 1, for example, the weights 32 are placed on the diaper 1 with respect to the samples 6 to 9 in Table 2 as described above, and thereafter, The apparent height H3 was measured. Then, the subject actually mounted each sample 6 to 9 on a doll imitating a low-weight child, and evaluated the fit.

  The evaluation of the fit was evaluated in two stages by visually observing the doll equipped with each of the samples 6 to 9 and touching the buttocks of the doll from above the sample. However, the evaluation of the apparent height H3 after placing the weight 32 (fitness evaluation 2 in Table 2) assumes that the diaper 1 was worn after being rubbed, and the subject evaluated the apparent height H2 (Table 2). Evaluation of fit property of 2 was performed more strictly than 1).

  From the results in Table 2, in all the samples 6 to 9, the apparent height H3 after placing the weight 32 was smaller than the apparent height H2. In other words, it has been found that the diaper 1 is less likely to break into two when the folding habit of the folding line FL at the time of packaging is reduced.

  And from the result of Table 2, it turned out that in the samples 6-7 whose apparent height H3 is 73 mm and 62 mm, the absorptivity of the absorbent core 2 to a low weight child is not good. On the other hand, it was found that in Samples 8 to 9 in which the apparent height H3 was 48 mm and 25 mm, the absorbability of the absorbent core 2 was good for low-weight children.

  Therefore, in the diaper 1 for a low-weight child, the folded diaper 1 is pressed against the upper surface of the diaper 1 with the skin side down while the diaper 1 is folded and extended in the longitudinal direction. After the weight 32 is placed and left for 2 minutes, the apparent height H3 in the natural state is preferably set to 60 mm or less (H3 ≦ 60 mm).

  By doing so, it is possible for a nurse or the like who takes measures such as rubbing the diaper 1 before wearing to recognize that the absorbent core 2 has a good fit to a low-weight child, and the fit of the diaper 1 can be improved. We are satisfied and use.

<<< shape of absorbent core 2 >>
The diaper 1 for low weight children preferably has the following features. However, the absorbent core 2 only needs to have the narrow portion 2A, and is not limited to the following.

  As shown in FIG. 5, the length L5 from the center CL of the absorbent core 2 in the longitudinal direction to one end 2A1 of the narrow portion 2A (the end 2A1 on the non-tape side opposite to the fastening tape 7 side) is It is preferable that the length be at least 22% of the length L4 of the absorbent core 2 in the longitudinal direction (L5 ≧ L4 × 0.22).

  Further, in the longitudinal direction, the narrow portion 2A may extend to the outside in the longitudinal direction beyond the center CL2 between the center CL of the absorbent core 2 and the one end 2b of the absorbent core 2 on the non-tape side.

  By doing so, as shown in FIG. 3A, in the case of normal mounting in which the second waist portion 1C on the non-tape side is mounted so as to cover the abdominal side, the low waist portion 2A extending toward the non-tape side allows the low waist portion 2A to be low. It makes it easier to lift the legs of heavyweight children. In other words, the narrow portion 2A is located at the crotch portion of the low-weight child whose leg is pulled up to the non-tape side. Therefore, when the legs of the low-weight child are closed, it is possible to prevent the absorbent core 2 having high rigidity from pressing the skin of the low-weight child. If the length L5 is less than 22% of the length L4, it is difficult for the narrow portion 2A to be located at the crotch portion of the low-weight child whose leg is lifted.

  Similarly, the length L6 from the center CL of the absorbent core 2 to the other end 2A2 of the narrow portion 2A (the end 2A2 on the tape side which is the fastening tape 7 side) in the longitudinal direction is the longitudinal direction of the absorbent core 2. (L6 ≧ L4 × 0.22).

  Further, in the longitudinal direction, the narrow portion 2A may extend to the outside in the longitudinal direction beyond the center CL3 between the center CL of the absorbent core 2 and the other end 2c of the absorbent core 2 on the tape side.

  By doing so, as shown in FIG. 3B, even in the case where the first waist portion 1A on the tape side is mounted so as to cover the abdomen, the low waist portion 2A extending to the tape side allows the first waist portion 1A to be low. It makes it easier to lift the legs of heavyweight children. In other words, the narrow portion 2A is located at the crotch portion of the low-weight child whose leg is lifted to the tape side. Therefore, when the legs of the low-weight child are closed, it is possible to prevent the absorbent core 2 having high rigidity from pressing the skin of the low-weight child. If the length L6 is less than 22% of the length L4, it becomes difficult for the narrow portion 2A to be located at the crotch portion of the low-weight child whose leg is lifted.

  Further, as shown in FIG. 5, both ends 2a in the width direction of the narrow portion 2A may have straight portions 2A3 along the longitudinal direction. In this case, the width of the absorbent core 2 can be narrowed over a wider range in the longitudinal direction, for example, as compared to a case where the side end of the absorbent core 2 has an arc shape that protrudes inward in the width direction. Specifically, the width of the absorbent core 2 can be set to 15 mm or more and 45 mm or less not only at the center CL in the longitudinal direction of the absorbent core 2 but also at the linear portion 2A3. Therefore, it becomes easy to raise the legs of the low-weight child. In addition, when the legs of the low-weight child are closed, it is possible to prevent the absorbent core 2 from pressing the skin of the low-weight child.

  Further, in the absorbent core 2 of the present embodiment, straight portions 2A3 are provided on both sides in the longitudinal direction with respect to the center CL in the longitudinal direction. Therefore, both when the diaper 1 is normally worn and when the diaper 1 is worn back and forth, the leg of the low-weight child can be easily pulled up.

  Further, by increasing the width of the narrow portion 2A, the indicator 12 whose color changes due to urination can be accommodated in the narrow portion 2A. The indicator 12 easily reacts in the narrow portion 2A. Therefore, the indicator 12 can be made to react even with a small amount of urine of a low-weight child, and it becomes easy to understand the time for changing the diaper 1.

  In the narrow portion 2A, the length W3 of the sheet portion around the leg from the side end of the absorbent core 2 to the side end of the diaper 1 in the width direction is long (see FIG. 1), and the standing height of the three-dimensional gather portion 8 is increased. Can be secured. Therefore, as shown in FIGS. 1 and 5, the length of the narrow portion 2A in the longitudinal direction is longer than the length L9 of the elastic portion 9 of the elastic member 9 for the three-dimensional gather portion in a state where the diaper 1 is unfolded and extended in the longitudinal direction. The length L10 may be lengthened (L9 <L10).

  By doing so, the narrow portion 2A can be arranged over a long range of the expansion and contraction portion of the elastic member 9 for the three-dimensional gather portion, and the three-dimensional gather portion 8 can be raised more reliably. Therefore, the excreted liquid can be blocked by the three-dimensional gather portion 8.

  However, the length of the narrow portion 2A may be set as follows when the diaper 1 is unfolded and elongated in the longitudinal direction (FIG. 1). In the longitudinal direction, the length L7 from the non-tape side (the other side) end 1a of the diaper 1 to the non-tape side end 2A1 of the narrow portion 2A is from the tape side (one side) end 1b of the diaper 1. The length of the fastening tape 7 to the non-tape end 7a is preferably L8 or more (L7 ≧ L8).

  When the diaper 1 is normally mounted, the approximate locking position of the end 7a of the fastening tape 7 in the second waist portion 1C is set at the above-described length from the non-tape side end 1a of the diaper 1 to the center CL side in the longitudinal direction. The position p1 is L8 away (see FIGS. 1 and 3C). The leg of the low-weight child is not pulled up to the outside in the longitudinal direction from the locking position p1 of the fastening tape 7. Therefore, it is preferable to arrange the end 2A1 of the narrow portion 2A closer to the center CL in the longitudinal direction than the position p1. In this way, the absorbing capacity of the absorbent core 2 can be ensured by not unnecessarily lengthening the narrow portion 2A.

  As shown in FIG. 5, the narrow portion 2A has a first folding guide portion 21a, a second folding guiding portion 21b, and a third folding guide for guiding the absorbent core 2 to bend along the width direction. The guide portions 21c are arranged side by side in the longitudinal direction.

  More specifically, the second folding guide 21b is disposed at the center in the longitudinal direction of the narrow portion 2A. The first folding guide 21a is disposed closer to the tape (one side) in the longitudinal direction than the second folding guide 21b. The third folding guiding portion 21c is arranged on the non-tape side (the other side) in the longitudinal direction from the second folding guiding portion 21b.

  In the absorbent core 2 of the present embodiment, as the first to third folding guide portions 21a to 21c, a pair of cutout portions 22a to 22b projecting inward in the width direction are provided on both sides in the width direction of the narrow portion 2A. 22c is provided. The pair of notches 22a to 22c have a shape symmetric with respect to a center line (not shown) that bisects the absorbent core 2 in the width direction, and are arranged symmetrically. The notches 22a to 22c are not limited to the mountain shape shown in FIG. 5, but may be, for example, a rectangular shape or a score line.

In the notched portions 22a to 22c, the basis weight (g / cm ² ) of the members (such as liquid absorbent fibers) constituting the absorbent core 2 is lower than that of the surrounding region, or the absorbent core 2 Does not exist. Therefore, at the portion of the absorbent core 2 provided with the pair of cutouts 22a to 22c, the absorbent core 2 is easily bent along the width direction due to the difference in rigidity with the surrounding region.

  As shown in FIG. 3C, the crotch part of the low-weight child whose leg is lifted comes into contact with a part deviated to one side from the center in the longitudinal direction of the diaper 1. Therefore, it is preferable that the diaper 1 has a folding starting point at a position (F1) at which the legs start to rise from the buttocks in contact with the floor for a low-weight child whose legs are raised on his back. Further, it is preferable that the diaper 1 also has a starting point for bending at the position (F2) of the base on the ventral side of the leg that is being lifted. By doing so, the part (F1 to F2) of the diaper 1 that contacts the crotch part of the low-weight child becomes the bottom, and the diaper 1 is easily deformed three-dimensionally. Therefore, the diaper 1 can easily follow the low-weight child raising the leg, and the fit is improved.

  The portion between the second folding guiding portion 21b and the third folding guiding portion 21c fits into the crotch portion of the low weight child to whom the diaper 1 is usually worn. Then, the second folding guide portion 21b and the third folding guiding portion 21c are bent along the low-weight child whose legs are lifted to the non-tape side, and the diaper 1 is three-dimensionally deformed and fits the body of the low-weight child. I do.

  Similarly, a portion between the first folding guiding portion 21a and the second folding guiding portion 21b is fitted to the crotch portion of the low-weight child to whom the diaper 1 is worn back and forth. Then, the first folding guide portion 21a and the second folding guiding portion 21b are folded along the low-weight child whose legs are pulled up to the tape side, and the diaper 1 is three-dimensionally deformed and fits the body of the low-weight child. .

  As described above, by providing the folding guide portions 21a to 21c at three places in the longitudinal direction of the absorbent core 2, the posture unique to a low-weight child can be obtained regardless of whether the diaper 1 is normally worn or when it is worn back and forth. Take a low weight baby to fit the body.

  In addition, since the absorbent core 2 has a plurality of folding guides 21a to 21c and a plurality of folding starting points, the folding of the diaper 1 at the folding line FL at the time of packaging can be eased. Therefore, as in the diaper 1 ′ of the comparative example of FIG. 4C, the fold line FL portion of the diaper 1 when it is packaged can be prevented from protruding outward, and the diaper can be fitted along the crotch and buttocks of a low weight child. 1 becomes easy to bend. Therefore, the floating of the absorbent core from the crotch and buttocks of the low weight child can be further suppressed.

  Further, in the absorbent core 2 of the present embodiment, the first fold guide 21a and the third fold guide 21c are arranged at the longitudinal ends of the narrow portion 2A, that is, the width of the absorbent core 2 Are located at the site where the shape begins to narrow. Therefore, the notch 22a of the first folding guide 21a and a part of the notch 22c of the third folding guide 21c are formed by the outline 2A4 inclined inward in the width direction of the narrow portion 2A. .

  Therefore, the diaper 1 can be folded at the base of the abdomen of the raised leg (F2 in FIG. 3C), and the diaper 1 fits the body of a low-weight child. In addition, the inclination of the outline 2A4 inclined inward in the width direction of the narrow portion 2A can be made steep. Therefore, the width of the absorbent core 2 can be reduced in a wider range in the longitudinal direction, and the leg of a low-weight child can be easily pulled up. In addition, when the legs of the low-weight child are closed, it is possible to prevent the absorbent core 2 from pressing the skin of the low-weight child.

  Note that the first to third folding guide portions 21a to 21c are not limited to being formed by the cutout portions 22a to 22c. For example, in the manufacturing process, the absorbent core 2 may be bent along the width direction, the basis weight of the members constituting the absorbent core 2 may be reduced along the width direction, or the absorbent core 2 may be bent in the width direction. The first to third folding guides 21a to 21c may be formed by forming a slit along the width direction at the center of the first and second folds.

  As described above, the absorbent core 2 of the present embodiment has a symmetric shape with respect to the center CL in the longitudinal direction. Therefore, on both sides in the longitudinal direction with respect to the longitudinal center CL of the absorbent core 2, folding guide portions (21a, 21c) are provided, or the linear portion 2A3 of the absorbent core 2 is provided. Therefore, the diaper 1 can be normally worn or can be worn back and forth, and the same effect can be obtained in any case.

  As described above, the embodiments of the present invention have been described. However, the above embodiments are for facilitating the understanding of the present invention, and are not intended to limit and interpret the present invention. Further, it is needless to say that the present invention can be changed or improved without departing from the spirit thereof, and the present invention includes equivalents thereof.

1 diapers (disposable diapers for low-weight children),
1A first girth, 1B crotch, 1C second girth,
2 absorbent core, 2A narrow part, 2A3 linear part,
21a first fold guide, 21b second fold guide,
21c third fold guiding portion, 22a to 22c notch portion,
3 Top sheet, 4 leakproof sheet,
5 exterior sheet, 6 side sheet, 7 fastening tape,
8 three-dimensional gather part, 9 three-dimensional gather part elastic member,
10 leg elastic member, 11 cutting line, 12 indicator,
30 test stand (stand), 30a upper surface, 31 boards, 32 weight,
FL folding line, L1 product length, L2 Apparent product length,
H2, H3 Apparent height S1 First area, S2 second area, FLa Another folding line

Claims (14)

Having a longitudinal direction and a width direction,
In the central portion in the longitudinal direction, comprising an absorbent core having a narrow portion narrower than the end portion,
The central width of the absorbent core in the longitudinal direction is 15 mm or more and 45 mm or less,
In a packaged state, the disposable diaper for a low-weight child folded in two along the folding line along the width direction,
In a state where the disposable diaper that has been folded in two is expanded and extended in the longitudinal direction and pressed against the upper surface of a table with the skin side down, the size of the disposable diaper covers the entire surface of the disposable diaper. After placing a weight plate and placing a 1 kg weight on the plate and allowing it to stand for 2 minutes, remove the weight and the plate and leave them in a natural state on the top surface,
The absorbent core has a first region along the upper surface, and a second region separated upward from the upper surface,
Another fold line that forms a boundary between the first region and the second region is formed,
Disposable diapers for low weight children characterized by the following. A disposable diaper for low weight children according to claim 1,
The disposable diaper for a low-weight child, wherein the another folding line is formed on both sides of the folding line in the longitudinal direction. It is a disposable diaper for low weight children according to claim 1 or 2,
The rigidity in the width direction of the absorbent core 2 in a region including the folding line is 1.1 N or less, a disposable diaper for a low-weight child. It is a disposable diaper for low weight children according to any one of claims 1 to 3,
The density of the absorbent core is less than 0.0155 g / cm ³ . It is a disposable diaper for low-weight children according to any one of claims 1 to 4,
After the disposable diaper is unfolded and extended in the longitudinal direction, the height of the disposable diaper in a direction perpendicular to the upper surface is less than 70 mm in a natural state in which the disposable diaper is placed on the upper surface of the table with the skin side down. Disposable diapers for low-weight children, characterized by the following. It is a disposable diaper for low weight children according to any one of claims 1 to 5,
In a state where the disposable diaper that has been folded in two is expanded and extended in the longitudinal direction and pressed against the upper surface of a table with the skin side down, the size of the disposable diaper covers the entire surface of the disposable diaper. After placing a weight plate and placing a 1 kg weight on the plate and allowing it to stand for 2 minutes, remove the weight and the plate and allow them to be in a natural state on the upper surface. A disposable diaper for low-weight children, wherein the height of the disposable diaper is 60 mm or less. It is a disposable diaper for low weight children according to any one of claims 1 to 6,
The length from the center of the absorbent core to one end of the narrow portion in the longitudinal direction is at least 22% of the longitudinal length of the absorbent core. Disposable diapers for low weight children. A disposable diaper for low weight children according to claim 7,
The length from the center of the absorbent core to the other end of the narrow portion in the longitudinal direction is at least 22% of the longitudinal length of the absorbent core. Disposable diapers for low weight children. A disposable diaper for a low-weight child according to any one of claims 1 to 8,
Disposable diapers for low-weight children, characterized in that both ends in the width direction of the narrow portion have straight portions along the longitudinal direction. It is a disposable diaper for low weight children according to any one of claims 1 to 9,
Having a pair of fastening tapes extending from both sides in the width direction from the waist portion on one side in the longitudinal direction,
In a state where the disposable diaper is expanded and elongated in the longitudinal direction,
The length in the longitudinal direction from the other end in the longitudinal direction of the disposable diaper to the other end in the longitudinal direction of the narrow portion is the one side in the longitudinal direction of the disposable diaper. The length of the fastening tape from the end to the other end in the longitudinal direction of the fastening tape is equal to or longer than the length in the longitudinal direction. A disposable diaper for low-weight children according to any one of claims 1 to 10,
In the narrow portion, a first fold guide, a second fold guide, and a third fold guide that guide the absorbent core to bend along the width direction are arranged in the longitudinal direction. A disposable diaper for low-weight children, which is disposed. A disposable diaper for low weight children according to claim 11,
The first folding guide portion is arranged on one side in the longitudinal direction than the second folding guide portion,
The third folding guide portion is disposed on the other side in the longitudinal direction than the second folding guide portion,
At least one of the first fold guide portion and the third fold guide portion is disposed at a portion of the narrow portion where the width of the absorbent core starts to be reduced. Disposable diapers for children. It is a disposable diaper for low weight children according to any one of claims 1 to 12,
The disposable diaper for low-weight children, wherein the absorbent core has a symmetrical shape in the longitudinal direction. A disposable diaper for a low weight child according to any one of claims 1 to 13,
A pair of three-dimensional gathers is arranged on both sides in the width direction of the disposable diaper,
The three-dimensional gather portion can be raised on the skin side by the three-dimensional gather portion elastic member that expands and contracts in the longitudinal direction,
The length of the narrow portion in the longitudinal direction is longer than the length of the elastic portion of the elastic member for the three-dimensional gather portion in a state where the disposable diaper is unfolded and extended in the longitudinal direction. Disposable diapers for low weight children.

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