JP7328757B2 - disposable diaper - Google Patents

Description

The present invention relates to tape-type disposable diapers.

Patent Document 1 discloses a tape-type disposable diaper. This type of disposable diaper is mainly composed of a diaper body that covers the buttocks and the lower abdomen in a state of being applied to the crotch, and the side panel provided on the buttock side of the diaper body, for example, is turned toward the lower abdomen and fixed. ing. At this time, it is important to prevent leakage from the gap by avoiding the gap between the diaper and the user's body.

When developing disposable diapers for adults, it is necessary to assume users with various body shapes. Some users to be assumed weigh less than 30 kg, while others weigh more than 80 kg. The hip size varies from about 50 cm to over 120 cm, and the thickness of the thighs also varies widely. Moreover, it must be possible to deal with users whose right and left sides of the body are in different states due to causes such as contracture.

On the other hand, disposable diapers are generally mass-produced, and sizes are standardized such as S, M, L, and LL. For this reason, it is necessary to devise ways to accommodate people with various body shapes. In actual disposable diapers, elastic materials are provided around the waist and legs to prevent gaps from forming between the diaper and the body, thereby preventing leakage through the gaps.

Tape-type disposable diapers developed for adults generally have a pair of left and right side panels each provided with two upper and lower fastening tapes. The upper fastening tape is provided to tightly attach the diaper body around the waist, and the lower fastening tape is provided to tightly attach the diaper body around the legs. In order to eliminate the gap around the waist, the upper fastening tape is pulled diagonally from the abdomen side to the leg side and fixed to the target zone provided on the lower abdomen of the main body of the diaper. In order to eliminate the gap around the leg, the lower fastening tape is pulled diagonally from the leg side toward the ventral side and fixed to the target zone.

Hook-and-loop fasteners are used as means for fixation between the fastening tape and the target zone. The loop surface of the hook-and-loop fastener is attached to the target zone of the diaper body, and the hook surface of the hook-and-loop fastener provided on the back side of the fastening tape is engaged with the loop surface, thereby fixing the fastening tape to the target zone. A special hook surface that is most easily engaged with the nonwoven fabric is used, and the hook surface is engaged with the exterior part of the diaper body, or a special nonwoven fabric that is easily engaged with a general hook surface is used as the exterior part of the diaper body. There are also disposable diapers designed to be used for

JP 2014-018387 A JP 2009-240679 A

When trying to wear the disposable diaper on the body without gaps, depending on the user's body shape, the inclination angles of the upper and lower fastening tapes may be insufficient. You can eliminate gaps around the waist by making the upper fastening tape more inclined toward the leg side, or eliminate the gap around the legs by making the lower fastening tape more inclined toward the ventral side. be. However, the fastening tape can only be attached to the hook-and-loop fastener provided in the target zone or to the nonwoven fabric forming the main body of the diaper, and the fastening tapes cannot be attached so as to overlap each other.

Therefore, if hook-and-loop fasteners are also provided on the side panels, the pair of left and right side panels can be fixed together. In other words, the loop surface of the hook-and-loop fastener is provided on the surface side of the side panel opposite to the wearer's body, and the hook surface of the hook-and-loop fastener provided on the back side of the other side panel can be engaged and fixed. This means that However, in this case, there are problems such as a rise in material costs and a decrease in comfort as a diaper due to hardening of the side panels. In addition, the volume of the fastening tape increases by the amount of the hook-and-loop fastener, and the fastening tape can be easily removed by the movement of the user.

Patent Literature 2 discloses embossing a side panel (“fixing tape” in Literature 2). Embossing is applied to the surface opposite to the hook-and-loop fastener provided on the fastening tape (“pinch part” in Document 2) to create weak adhesion between the back side and the hook-and-loop fastener, and the fastening tape is attached to the side panel. It is the content to be temporarily fixed. This document also suggests using the secondary effect of the embossing applied to the side panels to cross and fix the left and right side panels (paragraph [0045] of document 2, see FIG. 3). . This suggestion is based on the finding that the embossed non-woven fabric facilitates engagement with the hook surface of the hook-and-loop fastener (the "male member" in Document 2).

However, what is described in Patent Document 2 is to cross and fix the left and right side panels, not to cross the two fixing tapes provided on the side panels.

Also, the embossed non-woven fabric has a smooth surface and is less likely to engage with the hook surface of the hook-and-loop fastener. In this regard, Patent Document 2 discloses the length and height of each side of each quadrangular pyramid with respect to knurled embossing provided on an embossing roller for embossing (see paragraph 0070 of Document 2). However, various other conditions must be met in order to provide sufficient engaging force between the embossed nonwoven fabric and hooks of hook-and-loop fasteners. Patent Document 2 does not indicate such a condition.

I would like to be able to overlap and stick the two fixing tapes provided on the side panel .

One aspect of the disposable diaper has a diaper main body covering the buttocks and the lower abdomen in a state of being applied to the crotch, and two crossable fastening tapes adjacent to each other along the longitudinal direction of the diaper main body. , a side panel made of nonwoven fabric provided on both sides of the fixed end side of the diaper body, and a loop surface of a hook-and-loop fastener provided on the outer surface of the diaper body on the side of the fixed end opposite to the human body. , a hook surface of the hook-and-loop fastener provided on the inner surface of the fastening tape on the human body side and engaged with the loop surface, and a hook surface of the hook-and-loop fastener provided on the outer surface of the fastening tape on the side opposite to the human body, and applying an engaging force to the hook surface. and an embossed pattern.
One aspect of the embossed pattern is that when the two fastening tapes are crossed and overlapped, the hook surface of the upper fastening tape engages only with the embossed pattern of the lower fastening tape and is fixed. By setting the thickness ratio of the embossed portion to the non-embossed portion to be 10 to 14%, the shear force of the hook surface engaged with the embossed pattern is applied to the hook engaged with the loop surface. 50-65% of the surface shear force.
Another aspect of the embossed pattern is that when the two fastening tapes are crossed and overlapped, the hook surface of the upper fastening tape engages only with the embossed pattern of the lower fastening tape. By setting the area ratio of the embossed part to the non-embossed part to 15 to 40% so that it is fixed by It was set to 50 to 65% of the shear force of the hook surface.

One aspect of the method for manufacturing a disposable diaper includes the step of preparing a diaper body that covers the buttocks and the lower abdomen in a state of being applied to the crotch region; A pair of members made of nonwoven fabric, each having a fastening tape at its tip, having an embossed pattern applied to a position on the outer surface opposite to the human body, and the pair of members being embossed with each other. a step of preparing a side panel attached to a position where the hook surface of the hook-and-loop fastener engaging the pattern becomes the inner surface of the two fastening tapes on the human body side; a step of attaching the side panel to a member constituting the diaper main body; attaching a loop surface of the hook-and-loop fastener that engages the hook surface.
As one aspect, the non-woven fabric, which is the material of the side panel, is embossed so that the thickness ratio of the embossed portion to the non-embossed portion is 10 to 14% to form the embossed pattern. The embossed pattern is such that when the two fastening tapes are crossed and overlapped, the hook surface of the upper fastening tape is engaged only with the embossed pattern of the lower fastening tape and fixed. The shear force of the hook face engaged with the loop face was 50-65% of the shear force of the hook face engaged with the loop face.
As another aspect, the step of forming the embossed pattern by subjecting the nonwoven fabric, which is the material of the side panel, to embossing such that the area ratio of the embossed portion to the non-embossed portion is 15 to 40%. When the two fastening tapes are crossed and overlapped, the hook surface of the upper fastening tape is fixed by engaging only the embossed pattern of the lower fastening tape. The shear force of the hook face engaged with the embossed pattern was 50-65% of the shear force of the hook face engaged with the loop face.

Since the two fixing tapes provided on the side panels can be overlapped and attached to each other, the disposable diaper can be fitted to the user's body shape without gaps.

1 is a perspective view of a disposable diaper as an embodiment; FIG. The top view which shows the disposable diaper seen from the outer surface side. The top view which shows the disposable diaper seen from the inner surface side. The enlarged plan view of a side panel. FIG. 4 is an enlarged plan view of the side panel showing a state in which the breaking portion is broken; The enlarged plan view of the embossed pattern provided in the side panel. FIG. 4 is an enlarged perspective view of a side panel showing a state in which two fixing tapes are crossed by breaking a breaking portion; The perspective view which shows the test apparatus used for the test of a shear force.

An embodiment will be described with reference to the drawings. This embodiment is an example of application to a disposable diaper for adults.

[structure]
As shown in FIGS. 1 to 3, the disposable diaper 11 mainly includes a diaper body 31 that covers the buttocks and the lower abdomen while being placed on the crotch of the human body. The diaper main body 31 is worn on the human body by turning the region covering the buttocks forward and fixing it to the region covering the lower abdomen. In the present embodiment, the end of the diaper body 31 on the side of the region covering the lower abdomen is called the fixed end 12 , and the end on the side of the region covering the buttocks side is called the fixed end 13 .

The side surface of the diaper main body 31 is shaped such that the central portion between the fixed end 12 side region and the fixed end 13 side region is hollowed out. The gouged shape of the central portion serves as a leg hole and enhances the fit of the diaper main body 31 to the legs of the human body.

The diaper main body 31 has an absorbent body 34 laminated between a backsheet 32 (see FIG. 2) and a topsheet 33 (see FIG. 3). Both the back sheet 32 and the top sheet 33 are sheets made of nonwoven fabric. The backsheet 32 does not have liquid permeability, and the topsheet 33 has liquid permeability. The diaper main body 31 has a liquid-impermeable waterproof sheet 35 interposed between the absorbent body 34 and the backsheet 32 . The waterproof sheet 35 is attached, for example, to the nonwoven fabric forming the back sheet 32 . As such a waterproof sheet 35, one having air permeability is used as one example, and one having no air permeability is used as another example.

As shown in FIGS. 1 and 3 , the diaper body 31 has side sheets 36 on both sides of the top sheet 33 . These side sheets 36 are attached and joined to the surface sheet 33 and face each other with a predetermined space therebetween.

Leg gathers 37 are formed on the side edges of the surface sheet 33 by adhering thread rubber with a hot-melt adhesive. The leg gathers 37 enhance the fit of the diaper main body 31 to the legs and prevent leakage of urine from the crotch area of the wearer.

A waist gather 38 is formed using thread rubber at the edge of the diaper main body 31 on the side of the fixed end 13 . The waist gathers 38 enhance the fit of the diaper main body 31 to the waist on the back side.

At the tip of the side sheet 36, a three-dimensional gather 39 is formed by folding back a rubber thread coated with a hot-melt adhesive.

2 and 3 schematically show leg gathers 37, waist gathers 38, and three-dimensional gathers 39. FIG.

In order to fix the fixed end 13 to the fixed end 12 of the diaper main body 31, this embodiment employs a hook-and-loop fastener 51. As shown in FIG. The hook-and-loop fastener 51 is a combination of a loop surface 52 in which a plurality of loops are densely packed and a hook surface 53 in which a plurality of hooks are densely packed. do. Illustrations of the loops and hooks themselves are omitted.

In the disposable diaper 11 of this embodiment, the hook surface 53 of the hook-and-loop fastener 51 does not engage with the nonwoven fabric forming the backsheet 32 . As another form, the hook surface 53 of the hook-and-loop fastener 51 may engage not only the loop surface 52 but also the nonwoven fabric forming the back sheet 32 . As described above, the hook surface 53 is engaged with the nonwoven fabric forming the back sheet 32 by using a special hook surface that easily engages with the nonwoven fabric, or by using a special nonwoven fabric that easily engages with a general hook surface. It can be realized by using it for the exterior part of.

As shown in FIGS. 1 and 2, the diaper main body 31 has loop surfaces 52 of hook-and-loop fasteners 51 on the outer surface of the fixed end 12 side opposite to the human body. The loop surface 52 has an elongated rectangular shape along the fixed end 12 .

As shown in FIGS. 1 and 3, the diaper main body 31 has side panels 71 on both sides of the fixed end 13 side. Each side panel 71 has two fixing tapes 72 adjacent to each other along the longitudinal direction of the diaper body 31 at its tip. Each of these fixing tapes 72 has a hook surface 53 of the hook-and-loop fastener 51 on the inner surface on the human body side. The hook surface 53 has a size that extends over the entire width of the fastening tape 72 . In this way, the fixing tape 72 serves as a knob for fixing the hook surface 53 to the loop surface 52 provided on the fixed end 12 side of the diaper main body 31 .

The side panel 71 is made of nonwoven fabric. It is a nonwoven fabric with a basis weight of 30 to 120 g/m ² . Another preferred example is a non-woven fabric having a basis weight of 50 to 100 g/m ² , and a more preferred example is 70 to 90 g/m ² .

The portion to which the loop surface 52 of the hook-and-loop fastener 51 is attached is called the target zone TZ. This is because the hook surface 53 provided on the fastening tape 72 is a target area for engaging the loop surface 52 .

As shown in FIG. 4 , the side panel 71 has a tearing portion 73 along the width direction of the diaper body 31 between two adjacent fastening tapes 72 . The breakable portion 73 is formed by perforations and can be easily broken by manual force (see FIG. 5). The two adjacent fastening tapes 72 are more easily crossed with each other in a state where the torn portion 73 is torn (see FIG. 7).

The side panel 71 has an embossed pattern 101 . The embossed pattern 101 is provided on the entire surface of the side panel 71 .

As shown in FIGS. 4 and 5, the embossed pattern 101 is a plurality of linear patterns arranged adjacently along the width direction of the diaper main body 31, and is formed by embossing. Embossing is applied to the surface opposite to the surface on which the hook surface 53 is provided. As shown in an enlarged view in FIG. 6, the embossed pattern 101 has a corrugated uneven pattern. In this embodiment, the concave portion is called an embossed portion 102 and the convex portion is called a non-embossed portion 103 . These embossed portions 102 and non-embossed portions 103 are adjacent to each other.

However, the embossed pattern 101 is not limited to the waveform, and may be a pattern other than the waveform in which the embossed portions 102 and the non-embossed portions 103 are alternately adjacent to each other.

In this embodiment, the surface having the embossed pattern 101 is called an embossed surface 104 (see FIGS. 1 and 2 and FIGS. 4 and 5), and the back surface is called a non-embossed surface 105 (see FIGS. 1 and 3). The embossed surface 104 is an embossed surface. Therefore, as described above, the embossed surface 104 is provided on the surface opposite to the surface on which the hook surface 53 is provided, and the hook surface 53 is provided on the non-embossed surface 105 .

The hook surface 53 of the hook-and-loop fastener 51 engages the non-embossed portion 103 of the embossed pattern 101 provided on the embossed surface 104 . The hook surface 53 also engages the non-embossed surface 105 slightly, though not as strongly as the embossed surface 104 . There is a significant difference between the embossed surface 104 and the non-embossed surface 105 in terms of the engaging force of the hook surface 53 of the hook-and-loop fastener 51 .

In this embodiment, various attributes of the embossed pattern 101 are determined as follows.
(a1) The shear force of the hook surface 53 engaged with the embossed pattern 101 is 50% or more of the shear force of the hook surface 53 engaged with the loop surface 52 .
(a2) The shearing force of the hook surface 53 engaged with the embossed pattern 101 is 2.8 times or more the shearing force of the hook surface 53 engaged with the non-embossed surface 105 of the embossed pattern 101 .
(a3) The thickness ratio of the embossed portion 102 to the non-embossed portion 103 is 4-27%, preferably 10-14%.
(a4) The area ratio of the embossed portion 102 to the non-embossed portion 103 is 5-90%, preferably 15-40%.

[Production method]
The disposable diaper 11 of this embodiment is manufactured through the following steps (1) to (4). The steps (1) to (4) do not indicate the chronological order.

(1) Step of preparing diaper body The step of preparing diaper body 31 includes the following steps. At this time, inclusion of other steps is also permitted. For example, during the manufacturing process of the diaper body 31, it is possible to include a step of attaching the side panels 71 and the loop surfaces 52 of the hook-and-loop fasteners 51, which will be described later, to the members constituting the diaper body, such as the back sheet 32 and the top sheet 33. is. Here, the process of preparing the diaper main body 31 will be described, ignoring the process of attaching the side panel 71 and the loop surface 52 of the hook-and-loop fastener 51 .

[Sub-process 1]
The absorber 34 is molded.

[Sub-step 2]
A three-dimensional gather 39 is formed. The three-dimensional gathers 39 are formed by sandwiching a thread rubber coated with a hot-melt adhesive and folding back the tip portion of the side sheet 36 .

[Sub-step 3]
A surface sheet 33 is prepared and a three-dimensional gather 39 is attached.

[Sub-step 4]
A nonwoven fabric forming the back sheet 32 is prepared, and a waterproof sheet 35 is attached.

[Sub-step 5]
A waist gather 38 is formed. The waist gathers 38 are formed by sandwiching the rubber thread coated with the hot-melt adhesive between the film and the non-woven fabric.

[Sub-step 6]
A waist gather 38 is attached to the back sheet 32 to which the waterproof sheet 35 is attached.

[Sub-step 7]
A leg gather 37 is formed. The leg gathers 37 are formed by attaching thread rubber coated with a hot-melt adhesive to the portions around the legs of the back sheet 32 to which the waterproof sheet 35 is attached.

[Sub-step 8]
The absorbent body 34 molded in sub-process 1 is interposed, and the top sheet 33 that has undergone sub-processes 2 and 3 and the back sheet 32 that has undergone sub-processes 4-7 are bonded together.

[Sub-step 9]
After sub-step 8, leg holes are formed. In this step, the side portions of the back sheet 32 and the top sheet 33, which are stuck together with the absorbent body 34 interposed therebetween, are cut by a leg hole cutter. A leg hole having leg gathers 37 on the side is formed at the cut portion.

Thus, the diaper body 31 is completed.
Since the diaper main body 31 is formed by integrally joining the side panels 71 and attaching the loop surfaces 52 of the hook-and-loop fasteners 51 , the diaper body 31 is not completed without the side panels 71 and the loop surfaces 52 .

(2) Step of Preparing Side Panels The step of preparing the side panels 71 includes the following steps.

[Sub-process 1]
A nonwoven fabric having one side embossed is prepared. Such nonwovens may be sourced from any source or manufactured in-house. An embossed nonwoven fabric is produced, for example, as follows.

The embossed pattern 101 is formed by embossing. In this embossing process, the workpiece is sandwiched between a smooth roller with a smooth surface and an embossed roller with an uneven pattern on the surface. This is a processing method that produces an embossed pattern on one side of the The uneven pattern of the embossing roller is transferred to form an embossed pattern on the workpiece.

Therefore, the nonwoven fabric forming the side panel 71 is sandwiched between the smooth roller and the embossed roller, and both rollers are rotated while being heated. As a result, the pattern applied to the embossing roller is transferred to the nonwoven fabric, and an embossed pattern 101 is formed on one surface of the nonwoven fabric.

The embossed pattern 101 is thus formed on the outer surface side of the side panel 71 opposite to the human body. Although an example of forming the embossed pattern 101 on the entire surface of the side panel 71 is shown in this embodiment, the embossed pattern 101 may be formed on at least a part of the fastening tape 72 . The non-woven fabric is appropriately embossed in accordance with the intended embossed pattern 101 .

[Sub-step 2]
A hook surface 53 of a hook-and-loop fastener 51 is attached to an embossed nonwoven fabric. The attachment position of the hook surface 53 is adjusted so that it can be attached to each of the two fixing tapes 72 provided on each of the pair of side panels 71 . The hook surface 53 is attached to the inner surface positioned on the human body side, that is, the surface on which the embossed pattern 101 is not provided.

[Sub-step 3]
The non-woven fabric to which the hook surface 53 of the hook-and-loop fastener 51 is attached is cut and arranged into the shape of the side panel 71. - 特許庁At this time, the breaking portion 73 is also produced at the same time or separately. A pair of left and right side panels 71 are manufactured. Thus, the side panel 71 having the broken portion 73 to which the hook surface 53 is attached is obtained.

(3) Attaching Side Panels Attaching the side panels 71 to the diaper main body 31 . The attachment points are positions on both sides of the diaper main body 31 on the fixed end 13 side. As an example, the side panels 71 are attached to the surface sheet 33 before and after the three-dimensional gathers 39 are attached in the sub-step 3 of "(1) step of preparing the diaper body".

(4) Step of attaching the loop surface of the hook-and-loop fastener The loop surface 52 of the hook-and-loop fastener 51 is attached to the diaper main body 31 . The attachment position is the end on the side of the fixed end 12, which is the outer surface located on the side opposite to the human body. As an example, the loop surface 52 is attached to the back sheet 32 to which the waterproof sheet 35 is attached before or after attaching the waist gathers 38 in sub-step 6 of "(1) Diaper main body preparation step". conduct.

The disposable diaper 11 is completed through the above steps (1) to (4).

[Effect]
In order to wear the disposable diaper 11 on the human body, the diaper main body 31 on the fixed end 12 side is applied to the lower abdomen while the top sheet 33 side of the diaper main body 31 is applied to the crotch, and the fixed end 13 side covering the buttocks is applied to the lower abdomen. The diaper main body 31 is brought forward and fixed to the fixed end 12 . Hook-and-loop fasteners 51 are used for fixing. That is, the two fixing tapes 72 provided on the left and right side panels 71 are pinched with fingers, and the hook-and-loop fastener 51 provided on the fixing tape 72 is attached to the loop surface 52 of the hook-and-loop fastener 51 provided in the target zone TZ. The hook surface 53 is pressed. As a result, the hook surface 53 is engaged with the loop surface 52 to fix them together, and the disposable diaper 11 is put on the human body.

In some cases, the upper fastening tape 72 should be slanted toward the leg or the lower fastening tape 72 should be slanted toward the abdomen in order to increase the fit to the human body. Inclining the upper fastening tape 72 toward the leg may eliminate the gap around the waist, or inclining the lower fastening tape 72 toward the abdomen may eliminate the clearance around the leg. It is from.

Depending on the user's body shape, the angle of inclination of the upper and lower fastening tapes 72 may deepen, and a good feeling of fit may be obtained only when they are crossed. In order to allow the upper and lower fixing tapes 72 to intersect more freely at this time, the breaking portion 73 should be broken. As a result, the two fixing tapes 72 can be overlapped by crossing each other.

As shown in FIG. 7, when the two fixing tapes 72 are superimposed, the lower fixing tape 72 is fixed to the target zone TZ by the hook-and-loop fastener 51 . The fastening tape 72 overlaid thereon is fixed by engaging the hook surface 53 with the embossed pattern 101 provided on the surface side of the fastening tape 72 on the lower side. In this way, the two fastening tapes 72 can be pasted together without any trouble. Therefore, it is possible to increase the tolerance of the user's body shape, which allows the garment to fit the body without gaps, and to provide a good fit to more users.

According to this embodiment, the fastening tape 72 overlaid on the lower fastening tape 72 fixed to the target zone TZ can be fastened with sufficient strength. The main factors are the configurations (G1) to (G6) shown below.
(G1) The hook shearing force of the hook surface 53 engaged with the embossed pattern 101 is 50% or more of the shearing force of the hook surface 53 engaged with the loop surface 52 .
(G2) The shearing force of the hook surface 53 engaged with the embossed pattern 101 is 2.8 times or more the shearing force of the hook surface 53 engaged with the back side of the embossed pattern 101, that is, the non-embossed surface 105. .
(G3) The embossed pattern 101 has a thickness ratio of the embossed portion 102 to the non-embossed portion 103 of 4 to 27%, preferably 10 to 14%.
(G4) The embossed pattern 101 has an area ratio of the embossed portion 102 to the non-embossed portion 103 of 5 to 90%, preferably 15 to 40%.
(G5) The embossed pattern 101 has a plurality of linear patterns adjacent to each other.
(G6) The embossed pattern 101 is also provided on the area of the side panel 71 other than the fastening tape 72 .

[Modification]
Various modifications and changes are allowed in implementation.

For example, the area where the embossed pattern 101 is provided does not necessarily have to be the entire surface of the side panel 71 . The embossed pattern 101 may be provided at least on the surface of the fastening tape 72 opposite to the human body. may

In other implementations, all variations and modifications are permitted.

1. Shear Force A test apparatus as illustrated in FIG. 8 was manufactured, and it was verified by experiments that sufficient fixing strength was obtained for the overlapping fastening tapes 72 . In this testing apparatus, a test material 203 having a test surface 202 is placed on a desk 201, a belt 205 made of nonwoven fabric having a weight 204 detachably attached to an end thereof is provided, and a belt 205 on the opposite side of the belt 205 A hook tape 206 having hook surfaces 53 of hook-and-loop fasteners 51 at the ends is fixed. It is a simple device in which the hook surface 53 is engaged with the test surface 202 .

Experiments were conducted under the following conditions.

Prepared as the test surface 202 are:
・Loop surface of hook-and-loop fastener ・Embossed surface 104 of nonwoven fabric (side panel 71) introduced in the above embodiment
・Same non-embossed surface 105
- There are four types of non-woven fabrics that are not embossed.

The hook tape 206 had a width of 25 mm and a length of 28 mm. This was placed on the test surface 202 without applying a load, and a weight 204 of 1 kg was applied for 2 seconds to engage the hook surface 53 with the test surface 202 .

After that, the weight 204 is removed from the belt 205, and the test surface 202 is set in the tension/compression tester while the hook surface 53 is engaged with the test surface 202. Both the test surface 202 and the hook surface 53 are pulled vertically. Engagement force was measured. 180° peel test.

The tension/compression tester and chuck speed used are
・Tension compression tester: Imada Seisakusho Co., Ltd. SV-55C-20H
- Chuck speed: 240 mm/min.

Table 1 shows the experimental results.
The numerical values shown in Table 1 are experimental results and indicate shear forces (unit: N/25 mm).

Measurements could not be taken for the non-embossed side 105 and the non-embossed nonwoven. This is because it was separated from the hook surface 53 when it was temporarily engaged with the hook surface 53 and the weight 204 of 1 kg was attached and a load was applied. Therefore, the shear force between the non-embossed surface 105 and the hook surface 53 and between the non-embossed nonwoven fabric and the hook surface 53 is estimated to be 1 Kgf (9.7 N) or less.

As for the embossed surface 104 , it can be seen from the experimental results shown in Table 1 that a shear force of 50% or more was generated in comparison with the loop surface 52 of the normal hook-and-loop fastener 51 .

In this way, when a shear force of 50% or more is obtained compared to the loop surface 52 of the normal hook-and-loop fastener 51, when the disposable diaper 11 is worn, the two fastening tapes 72 adjacent to each other are crossed and attached. In order to achieve this purpose, the question is whether the shear force is sufficient. Therefore, the inventors of this application conducted a sensory test.

The sensory test was conducted by preparing a side panel similar to the side panel 71 described in the embodiment, and attaching the hook surface 53 of the hook-and-loop fastener 51 provided on the fastening tape 72 to four different surfaces. The surface to which the hook surface 53 is attached is
(a) Non-woven fabric that is not embossed (b) The surface opposite to the embossed pattern 101 provided on the other side panel 71 (c) The surface of the embossed pattern 101 provided on the other side panel 71 (d) Embodiment It is similar to the loop surface 52 of the hook-and-loop fastener 51 described in . Regarding the above (b) and (c), another panel similar to the side panel 71 is prepared, and the surface opposite to the embossed pattern 101 provided on the fastening tape 72 and the surface of the embossed pattern 101 are respectively attached. used.

A sensory test was performed by attaching the hook surface 53 of the hook-and-loop fastener 51 to each of the above surfaces and pulling them laterally, ie, in the shear direction. At this time, the subjects were asked to evaluate the shear force on a scale of 1 to 5. Evaluation 1 is the weakest shear force, and evaluation 5 is the strongest evaluation.

Table 2 shows the results of the sensory test.
The non-embossed nonwoven fabric of (a) above and the non-embossed surface of (b) above were evaluated as 1. On the other hand, the loop surface 52 of the hook-and-loop fastener 51 of (d) was evaluated as 5. In other words, when (a) and (b) are evaluated as 1 and (d) is evaluated as 5, how much is the shear force of the hook surface 53 against the embossed surface of (b), that is, the surface having the embossed pattern 101? The purpose of this sensory test is whether you feel that it is.
The result was a rating of 3.
To put it plainly, the result was that it felt somewhere between (a) (b) hardly sticking and (d) strongly sticking.

From the results of the above sensory test, the measurement value of shear force of 50% or more compared to the loop surface 52 of the normal hook-and-loop fastener 51 shown in Table 1 is the same as that of the two fastenings adjacent to each other when the disposable diaper 11 is worn. It can be said that the shear force is sufficient to achieve the purpose of crossing and pasting the tapes 72 .

Experimental results for the embossed surface 104 and the non-embossed surface 105 are compared. As described above, the shear force of the non-embossed surface 105 is estimated to be 9.7N or less. Assuming that it is 9.7N, the average value of the embossed surface 104 is 27.1N, so
27.1N/9.7N=2.8
becomes. Therefore, the shearing force of the embossed surface 104 is 2.8 times or more the shearing force of the non-embossed surface 105 .

From these experimental results, G1 and G2 described above, which are based on the fact that the fastening tape 72 superimposed thereon can be fastened with sufficient strength to the fastening tape 72 on the lower side fixed to the target zone TZ. The correctness of the factors was verified.

2. Thickness ratio between embossed part and non-embossed part Using a digital microscope, the thicknesses of the embossed part 102 and the non-embossed part 103 were measured. The equipment and software used
・Equipment used: Dino-Lite Pro from Optoscience Co., Ltd.
Polarizer
・Software used: DinoCapture2.0
is.

Table 3 shows the measurement results.
All are the results of measurement at a magnification of 60 times. The thickness of the embossed portion 102 was 0.088 to 0.103 mm (0.094 mm on average), and the thickness of the non-embossed portion 103 was 0.777 to 0.901 mm (0.850 mm on average).

As is clear from this measurement result, the embossed pattern 101 has a thickness ratio of the embossed portion 102 to the non-embossed portion 103 of 10 to 14%.

Therefore, the correctness of the factor G3, which is the basis for the fact that the fastening tape 72 overlaid on the lower fastening tape 72 fixed to the target zone TZ can be fastened with sufficient strength, is verified. was done.

3. Area ratio of embossed part and non-embossed part In the above experiment and measurement, the width of the embossed part 102 was set to 1.0 mm, and the width of the non-embossed part 103 was set to 3.0 mm. The surface 104 was used. Therefore, the area ratio of the embossed portion 102 to the non-embossed portion 103 is 33.333%.

Since the correctness of the above factors G1 to G3 has been verified, the value of 33.333% of the area ratio of the embossed portion 102 to the non-embossed portion 103 also proves the correctness of the above G4 factor. It will be.

11 Disposable Diaper 12 Fixed End 13 Fixed End 31 Diaper Body 32 Back Sheet 33 Top Sheet 34 Absorber 35 Waterproof Sheet 36 Side Sheet 37 Leg Gather 38 Waist Gather 39 Solid Gather 51 Velcro Fastener 52 Loop Surface 53 Hook Surface 71 Side Panel 72 Fastening tape 73 Fractured portion 101 Embossed pattern 102 Embossed portion 103 Non-embossed portion 104 Embossed surface 105 Non-embossed surface 201 Desk 202 Test surface 203 Test material 204 Weight 205 Belt 206 Hook tape TZ Target zone

Claims (11)

a diaper body that covers the buttocks and the lower abdomen while being applied to the crotch;
a side panel made of a non-woven fabric, which has two intersecting fastening tapes adjacent to each other along the longitudinal direction of the diaper body, and which are provided on both sides of the fixed end side of the diaper body, respectively;
a loop surface of a hook-and-loop fastener provided on the outer surface of the diaper main body opposite to the human body on the fixed end side;
a hook surface of a hook-and-loop fastener provided on the inner surface of the fastening tape on the human body side and engaged with the loop surface;
an embossed pattern provided on the outer surface of the fastening tape on the side opposite to the human body and generating an engaging force on the hook surface;
with
The embossed pattern is such that when the two fastening tapes are crossed and overlapped, the hook surface of the upper fastening tape is engaged only with the embossed pattern of the lower fastening tape and fixed. By setting the thickness ratio of the embossed portion to the non-embossed portion to 10 to 14%, the shear force of the hook surface engaged with the embossed pattern is reduced to the shear force of the hook surface engaged with the loop surface. 50-65% of the force,
disposable diapers. a diaper body that covers the buttocks and the lower abdomen while being applied to the crotch;
a side panel made of a non-woven fabric, which has two intersecting fastening tapes adjacent to each other along the longitudinal direction of the diaper body, and which are provided on both sides of the fixed end side of the diaper body, respectively;
a loop surface of a hook-and-loop fastener provided on the outer surface of the diaper main body opposite to the human body on the fixed end side;
a hook surface of a hook-and-loop fastener provided on the inner surface of the fastening tape on the human body side and engaged with the loop surface;
an embossed pattern provided on the outer surface of the fastening tape on the side opposite to the human body and generating an engaging force on the hook surface;
with
The embossed pattern is such that when the two fastening tapes are crossed and overlapped, the hook surface of the upper fastening tape is engaged only with the embossed pattern of the lower fastening tape and fixed. By setting the area ratio of the embossed portion to the non-embossed portion to 15 to 40%, the shear force of the hook surface engaged with the embossed pattern is reduced to the shear force of the hook surface engaged with the loop surface. 50-65% of the force,
disposable diapers. The shear force of the hook surface engaged with the embossed pattern is 2.8 times or more the shear force of the hook surface engaged with the back side of the embossed pattern.
The disposable diaper according to claim 1 or 2. The embossed pattern has a thickness ratio of the embossed portion to the non-embossed portion of 10 to 14%.
The disposable diaper according to claim 2. The embossed pattern has a plurality of linear patterns adjacent to each other,
A disposable diaper according to any one of claims 1 to 4. The embossed pattern is also provided in an area other than the fastening tape of the side panel,
A disposable diaper according to any one of claims 1 to 5. The side panel has a fracture portion along the width direction of the diaper body,
The two fastening tapes can freely cross each other with the breaking portion broken.
A disposable diaper according to any one of claims 1 to 6. A step of preparing a diaper body that covers the buttocks and the lower abdomen while being applied to the crotch;
A pair of members made of nonwoven fabric having two crossable fastening tapes at their ends, which are arranged adjacent to each other along the longitudinal direction of the diaper body, and are applied to the outer surface on the side opposite to the human body. a side panel having an embossed pattern formed by embossing and attached at a position where the hook surface of the hook-and-loop fastener engaging the embossed pattern of the pair of members becomes the inner surface of the two fastening tapes facing the human body; the process of preparing
a step of attaching the side panels to members constituting the diaper body so as to be positioned on both sides of the diaper body on the fixed end side;
a step of attaching the loop surface of the hook-and-loop fastener that engages with the hook surface to a member constituting the diaper body so as to be positioned on the outer surface of the diaper body opposite to the human body on the fixed end side of the diaper body;
with
A step of embossing the nonwoven fabric, which is the material of the side panel, so that the thickness ratio of the embossed portion to the non-embossed portion is 10 to 14% to form the embossed pattern,
The embossed pattern is such that when the two fastening tapes are crossed and overlapped, the hook surface of the upper fastening tape is engaged only with the embossed pattern of the lower fastening tape and fixed. The shear force of the hook surface engaged with the loop surface is 50 to 65% of the shear force of the hook surface engaged with the loop surface,
A method for manufacturing a disposable diaper. A step of preparing a diaper body that covers the buttocks and the lower abdomen while being applied to the crotch;
A pair of members made of nonwoven fabric having two crossable fastening tapes at their ends, which are arranged adjacent to each other along the longitudinal direction of the diaper body, and are applied to the outer surface on the side opposite to the human body. a side panel having an embossed pattern formed by embossing and attached at a position where the hook surface of the hook-and-loop fastener engaging the embossed pattern of the pair of members becomes the inner surface of the two fastening tapes facing the human body; the process of preparing
a step of attaching the side panels to members constituting the diaper body so as to be positioned on both sides of the diaper body on the fixed end side;
a step of attaching the loop surface of the hook-and-loop fastener that engages with the hook surface to a member constituting the diaper body so as to be positioned on the outer surface of the diaper body opposite to the human body on the fixed end side of the diaper body;
with
A step of embossing the non-woven fabric, which is the material of the side panel, so that the area ratio of the embossed part to the non-embossed part is 15 to 40% to form the embossed pattern,
The embossed pattern is such that when the two fastening tapes are crossed and overlapped, the hook surface of the upper fastening tape is engaged only with the embossed pattern of the lower fastening tape and fixed. The shear force of the hook surface engaged with the loop surface is 50 to 65% of the shear force of the hook surface engaged with the loop surface,
A method for manufacturing a disposable diaper. A step of attaching the hook surface of the hook-and-loop fastener to the non-woven fabric that is the material of the side panel,
A method for manufacturing a disposable diaper according to claim 8 or 9. a step of cutting the non-woven fabric to which the hook surface of the hook-and-loop fastener is attached into the shape of the side panel;
A method for manufacturing a disposable diaper according to any one of claims 8 to 10.

Images