Connecting sheet and clothing attachment item

Abstract

To provide a connecting sheet that can reduce noise generated when peeled from an object.SOLUTION: The connecting sheet is laminated to the object and thus connected to the object, and includes: a sheet substrate having a first main surface and a second main surface; a first adhesive layer formed on the first main surface of the sheet substrate; and a plurality of hook components that protrude from the first main surface of the sheet substrate in a first direction and are spaced in a second direction in which the first main surface extends. The hook components each includes: a column portion that extends from the sheet substrate in the first direction and protrudes from a surface of the first adhesive layer; and a head portion that extends from a tip of the column portion in the second direction. The lower surface of the head portion is covered with an adhesive material.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] One aspect of the present invention relates to a connecting sheet and a clothing attachment article. [Background technology]

[0002] Connecting sheets using adhesive materials have been used to secure articles to clothing and the like. For example, absorbent articles such as napkins are secured to clothing such as underwear via the adhesive of the connecting sheet. For example, Patent Document 1 describes a connecting sheet having a slip-preventing adhesive layer for releasably attaching the article to clothing. This connecting sheet has an adhesive layer on the main surface of the sheet substrate. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-115563 Summary of the Invention [Problem to be solved by the invention]

[0004] When an article such as a napkin is peeled off from a garment, the adhesive layer of the connecting sheet is peeled off from the garment. In this case, noise is generated as the adhesive layer peels off from the garment. Conventional connecting sheets have a problem in that they generate a large amount of noise when peeled off from the garment. Therefore, there has been a demand for reducing the noise generated when peeling a connecting sheet from an object such as a garment. [Means for solving the problem]

[0005] A connecting sheet in one embodiment of the present invention is a connecting sheet that connects to an object by being overlaid on the object, and includes a sheet base having a first main surface and a second main surface, a first adhesive layer formed on the first main surface of the sheet base, and a plurality of hook members that protrude from the first main surface of the sheet base in a first direction and are arranged at a distance from each other in a second direction in which the first main surface extends, wherein the hook members include a pillar portion that extends from the sheet base in the first direction and protrudes from the surface of the first adhesive layer, and a head portion that extends from the tip of the pillar portion in the second direction, and at least the underside of the head portion is covered with an adhesive material. [Effects of the Invention]

[0006] According to the present invention, it is possible to reduce noise generated when peeling the connecting sheet from the object. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a diagram showing a napkin provided with a connecting sheet according to one embodiment. [Figure 2] FIG. 2 is a cross-sectional view showing a portion of a connecting sheet according to one embodiment. [Figure 3] 1A is a perspective view showing a roll product in which a connecting sheet is wound into a roll, and FIG. 1B is a cross-sectional view showing how the connecting sheets are overlapped in the roll product. [Figure 4] 10 is a graph showing the relationship between the thickness of the first adhesive layer of the connecting sheet and the noise level. [Figure 5] 1(a) is an enlarged photograph of the connecting sheet according to the example, and FIG. 1(b) is an enlarged photograph showing the connecting sheet before the adhesive material is applied. [Figure 6] 1 is a table showing experimental results of examples and comparative examples. [Figure 7] 1 is a table showing experimental results of examples and comparative examples. [Figure 8] 1 is a table showing experimental results of examples and comparative examples. [Figure 9] 1 is a table showing experimental results of examples and comparative examples. DETAILED DESCRIPTION OF THE INVENTION

[0008] Various embodiments will be described in detail below with reference to the drawings, in which the same or equivalent parts are designated by the same reference numerals.

[0009] FIG. 1 is a diagram showing a napkin equipped with a connecting sheet according to one embodiment of the present invention. The napkin 1 has a liquid-permeable front surface 1a facing the skin, a liquid-impermeable back surface 1b (connecting surface) facing the clothing, and a connecting sheet 100 provided on the back surface 1b. The back surface 1b is the connecting surface that is connected to the clothing. In the example shown in FIG. 1, connecting sheets 100 are provided in multiple regions on the back surface 1b, each spaced apart from one another. The number of regions in which the connecting sheets 100 are provided, the shape of each region, and the dimensions of each region are not limited to these and can be designed as desired. Furthermore, the connecting sheet 100 is not limited to napkins and may be applied to light incontinence pads, body warmers (used by attaching them to clothing), and other such products. Napkins and light incontinence pads are collectively referred to as absorbent articles. Absorbent articles, including body warmers that are attached to clothing, are also referred to as garment-attachable articles.

[0010] Next, the structure of connecting sheet 100 will be described with reference to Figure 2. Figure 2 is a cross-sectional view showing a portion of connecting sheet 100 according to one embodiment. For the purpose of explanation, an XYZ Cartesian coordinate system is also shown in Figure 2.

[0011] The connecting sheet 100 is connected to an object 150 such as underwear by being placed on top of the object 150. In this way, the connecting sheet 100 can secure the napkin 1 to the object 150 such as clothing. As shown in FIG. 2, the connecting sheet 100 includes a sheet base material 110, a first adhesive layer 120, a second adhesive layer 125, and a plurality of hook members 130. In this embodiment, the direction perpendicular to the sheet base material 110 is defined as the Z-axis direction (first direction). The direction perpendicular to the Z-axis direction is defined as the X-axis direction, and the direction perpendicular to both the Z-axis direction and the X-axis direction is defined as the Y-axis direction.

[0012] The sheet substrate 110 is substantially sheet-shaped and has a first main surface 110a and a second main surface 110b that face each other in the Z-axis direction. The sheet substrate 110 extends in the XY plane (second direction). That is, the first main surface 110a and the second main surface 110b extend in the XY plane. Of these, a plurality of hook members 130 are formed on the first main surface 110a. The sheet substrate 110 is formed from a resin material, for example, poly(ethylene terephthalate), polyamide such as nylon, poly(styrene-acrylonitrile), poly(acrylonitrile-butadiene-styrene), polyolefin such as polypropylene, plasticized vinyl chloride, polyester, or the like. The thickness of the sheet substrate 110 is approximately 20 μm to 100 μm.

[0013] The first adhesive layer 120 is formed on the first main surface 110a of the sheet substrate 110. The first adhesive layer 120 is provided so as to fill the spaces between the multiple hook members 130. The first adhesive layer 120 is formed so as to cover substantially the entire surface of the first main surface 110a (except for the positions of the hook members 130). Examples of materials used for the first adhesive layer 120 include natural rubber / resin, synthetic rubber / resin, and acrylate copolymers. The thickness of the first adhesive layer 120 may be 10 μm or more, or 20 μm or more, and may be 100 μm or less, or 90 μm or less. The coating weight may be 10 gsm or more, or 20 gsm or more, and may be 100 gsm or less, or 90 gsm or less. The adhesive strength of the first adhesive layer 120 may be 2 (N / 25 mm) or more, or 4 (N / 25 mm) or more, or 14 (N / 25 mm) or less, or 8 (N / 25 mm) or less. The adhesive strength of the first adhesive layer 120 is a value defined by the JISZ 0237 method.

[0014] The second adhesive layer 125 is formed on the second main surface 110b of the sheet substrate 110. The material of the second adhesive layer 125 is the same adhesive material as that of the first adhesive layer 120. The first adhesive layer 120 and the second adhesive layer 125 may be formed of the same adhesive material, or may be formed of different adhesive materials. The second adhesive layer 125 may also be omitted. The thickness of the first adhesive layer 120 may be 10 μm or more, or 20 μm or more, and may be 120 μm or less, or 110 μm or less.

[0015] The hook members 130 protrude in the Z-axis direction (first direction) from the first main surface 110a of the sheet substrate 110. The hook members 130 are arranged spaced apart from one another in the XY plane, which is the plane in which the first main surface 110a extends. The hook members 130 may be arranged in a lattice pattern perpendicular to the XY plane, or in a lattice pattern diagonal to the XY plane, a staggered pattern, or randomly. Examples of materials that can be used for the hook members 130 include poly(ethylene terephthalate), polyamides such as nylon, poly(styrene-acrylonitrile), poly(acrylonitrile-butadiene-styrene), polypropylene, plasticized vinyl chloride, and polyester. The hook members 130 may be made of the same material as the sheet substrate 110 and formed integrally with the sheet substrate 110. Alternatively, the hook members 130 may be made of a different material from the sheet substrate 110 and formed as separate members. The density at which the hook members 130 are arranged can be, for example, about 500 to 5000 pieces per square inch, or about 1600 to 3500 pieces per square inch.

[0016] The average height of hook members 130 from first main surface 110a may be 170 μm or more, or 90 μm or more. The average height of hook members 130 from first main surface 110a may be 330 μm or less, or 310 μm or less.

[0017] The hook members 130 protrude in the Z-axis direction positive direction beyond the surface 120a of the first adhesive layer 120 on the Z-axis positive side. The difference between the average height of the hook members 130 (measured from the first main surface 110a of the sheet substrate 110) and the average thickness of the first adhesive layer 120 (measured from the first main surface 110a of the sheet substrate 110), i.e., the protrusion amount of the hook members 130 from the first adhesive layer 120, may be 10 μm or more, or 100 μm or more. The protrusion amount may be 600 μm or less, or 500 μm or less. Note that this protrusion amount is ultimately determined within the spirit of the invention based on various factors, such as the size and density of the hook members 130, the material and thickness of the adhesive, and the type of object. Furthermore, the heights of all the hook members 130 in the connecting sheet 100 may be the same (variations within the range of manufacturing error are allowed), or the heights may differ between some regions and other regions.

[0018] Hook member 130 includes a pillar portion 131 and a head portion 132. Pillar portion 131 extends in the Z-axis direction from sheet substrate 110 and protrudes from surface 120a of first adhesive layer 120. Head portion 132 extends from the tip of pillar portion 131 in the XY plane. Note that the shapes of pillar portions 131 and head portions 132 of all hook members 130 in connecting sheet 100 may be the same (variations within the range of manufacturing error are allowed), or the shapes may differ between some regions and other regions.

[0019] The hook member 130 has adhesive-applied portions 141, 142 formed by covering portions protruding from the first adhesive layer 120 with an adhesive. Specifically, the outer peripheral surface 131a of the pillar portion 131 is covered with an adhesive. As a result, the adhesive-applied portion 141 is formed on the outer peripheral side of the pillar portion 131. Furthermore, the lower surface 132a of the head portion 132 is covered with an adhesive. As a result, the adhesive-applied portion 142 is formed on the lower side of the head portion 132. The thickness of the adhesive-applied portion 141 is not particularly limited, but may be 5 μm or more, or 10 μm or more. The thickness may be 50 μm or less, or 40 μm or less. The thickness of the adhesive-applied portion 142 is not particularly limited, but may be 5 μm or more, or 10 μm or more. The thickness may be 100 μm or less, or 80 μm or less.

[0020] The adhesive application portion 142 is formed over the entire area between the inner peripheral end (the connection portion between the base portion 131 and the head portion 132) and the outer peripheral end 132b of the lower surface 132a of the head portion 132. Therefore, the adhesive application portion 142 of the head portion 132 extends further outward than the adhesive application portion 141 of the base portion 131.

[0021] A release material 155 is applied to the upper surface 132c of the head 132 of the hook member 130. As a result, no adhesive material is applied to the upper surface 132c of the head 132. Here, as shown in FIG. 3(a), the connecting sheet 100 may be rolled up and distributed as a roll product 200. In this case, as shown in FIG. 3(b), the connecting sheet 100 is rolled up so that the first main surface 110a is positioned on the outer periphery. The hook member 130 is positioned so that it protrudes from the first main surface 110a toward the outer periphery. Therefore, the second adhesive layer 125 on the second main surface 110b side is superimposed on the upper surface 132c of the head 132 of the hook member 130, which is positioned on the inner periphery. Because the release material 155 is applied to the upper surface 132c of the head 132 and no adhesive material is disposed thereon, the superimposed second adhesive layer 125 can be quickly peeled off from the upper surface 132c.

[0022] Next, the functions and effects of the connecting sheet 100 according to this embodiment will be described.

[0023] The connecting sheet 100 is a connecting sheet 100 that connects to an object 150 by being overlapped with the object 150, and includes a sheet base material 110 having a first main surface 110a and a second main surface 110b, a first adhesive layer 120 formed on the first main surface 110a of the sheet base material 110, and a plurality of hook members 130 that protrude from the first main surface 110a of the sheet base material 110 in the Z-axis direction and are arranged at a distance from each other in the X-axis and Y-axis directions along which the first main surface 110a extends, and the hook members 130 include a pillar portion 131 that extends from the sheet base material 110 in the Z-axis direction and protrudes from the surface of the first adhesive layer 120, and a head portion 132 that extends from the tip of the pillar portion 131 in the X-axis and Y-axis directions, and the lower surface 132a of the head portion 132 is covered with an adhesive material.

[0024] FIG. 4 is a graph showing the relationship between the thickness of the first adhesive layer 120 of the connecting sheet and the noise level. The noise level refers to the magnitude of noise generated when the connecting sheet is peeled from an object. Measurement point P1 indicates the measurement result when the thickness of the first adhesive layer 120 is zero, i.e., when the first adhesive layer 120 is not formed. Measurement point P2 indicates the measurement result when the thickness of the first adhesive layer 120 is large enough that the hook members 130 are completely buried in the first adhesive layer 120. In other words, measurement point P2 indicates the noise level when the connecting sheet is composed only of an adhesive layer. As shown in FIG. 4, the noise level decreases as the thickness of the first adhesive layer 120 increases from measurement point P1. The noise level also decreases as the thickness of the first adhesive layer 120 decreases from measurement point P2, reaching a minimum at measurement point P3. Thus, when the connecting sheet 100 according to this embodiment is connected to an object via both the hook members 130 and the first adhesive layer 120, the noise generated during peeling can be reduced.

[0025] Thus, the effect of reducing noise when the connecting sheet 100 is peeled off is achieved by a combination of multiple factors. For example, when the connecting sheet 100 is connected to the object 150 by both the hook member 130 and the first adhesive layer 120, the first adhesive layer 120 is intermittently bonded to the object 150. In this case, noise during peeling can be reduced compared to when the first adhesive layer 120 is peeled off from a state in which it is bonded entirely to the object 150. In addition, the underside 132a of the head 132 of the hook member 130 is covered with an adhesive material. Therefore, when the head 132 of the hook member 130 is released from the fibers of the object 150 during peeling, the adhesive material functions as a cushion. This attenuates the force of deformation of the head 132 when peeled off, thereby reducing the generated noise.

[0026] The adhesive strength of first adhesive layer 120 is 2 (N / 25 mm) to 14 (N / 25 mm). In this case, the connecting strength between connecting sheet 100 and object 150 can be ensured while noise generated during peeling can be suppressed.

[0027] The height of hook member 130 from first main surface 110a is 170 μm to 330 μm. In this case, the connecting force between connecting sheet 100 and object 150 can be ensured, while noise generated during peeling can be suppressed.

[0028] Connecting sheet 100 further includes second adhesive layer 125 formed on second main surface 110b of sheet substrate 110. In this case, connecting sheet 100 is fixed to another member via second adhesive layer 125.

[0029] A release material 155 is applied to the upper surface 132c of the head 132 of the hook member 130. In this case, it is possible to prevent the adhesive material from adhering to the upper surface 132c of the head 132.

[0030] The connecting sheet 100 is wound into a roll so that the first main surface 110a is disposed on the outer periphery. In this case, the connecting sheet 100 can be unwound from the roll and cut into the required amount.

[0031] The napkin 1 has the above-described connecting sheet 100 on the connecting surface that is connected to the clothing, which can reduce noise that occurs when the napkin 1 is peeled off from the clothing.

[0032] Furthermore, typical napkins are individually wrapped. The packaging material is made of nonwoven fabric, film, paper, etc. In conventional napkins, the connecting sheet is composed only of an adhesive layer. If this adhesive layer is exposed, it will adhere to the packaging material, making it impossible to peel off or causing damage during use. Therefore, in the past, a release liner was used to cover the adhesive layer, or a release material was applied to the packaging material. On the other hand, in the case of napkin 1 using connecting sheet 100 of this embodiment, the adhesive strength to the packaging material can be reduced, which is advantageous in that it is not necessary to apply a release liner or a release layer to the packaging material. Furthermore, hook member 130 prevents slippage from the packaging material, which advantageously prevents wrinkles and other problems caused by the napkin 1 moving within the packaging material.

[0033] The present invention is not limited to the above-described embodiments.

[0034] For example, the shape of the hook member is not limited to the above-described embodiment, and may be any shape, as long as it has a post and a head and can form an adhesive layer on the underside of the head.

[0035] Examples are shown below, but the present invention is not limited to the following examples.

[0036] [Example] Example 1 was a sheet substrate 110 having a hook member 130 as shown in FIG. 5(b), with a first adhesive layer 120 and adhesive application portions 141, 142 formed as shown in FIG. 5(a). The height of the hook member, adhesive composition, adhesive coating amount, adhesive strength, and shear strength were as shown in FIG. 6. Adhesion strength was measured in accordance with JIS Z 0237 by applying 80 μm of adhesive to a PP film, attaching it to a SUS panel, and performing a 90° peel at 300 mm / min. The adhesive strength is expressed in units of "N / 25 mm." Shear strength was measured by attaching the film to cotton attached to a metal panel and pulling it in the shear direction at 300 mm / min. The shear strength is expressed in units of "N / 20 mm x 25 mm." The diameter of the post of the hook member was 250 μm, the diameter of the head was 290 μm, and the thickness of the head was 80 μm. The density of the hook members was 1600 pins / square inch.

[0037] Compared to Example 1, Example 2 (see FIG. 7) and Example 3 (see FIG. 8) used different adhesive materials for the first adhesive layer and different coating amounts. Example 1 did not have the first adhesive layer, and Comparative Example 2 did not have the hook member (see FIG. 6). Example 2 did not have the hook member, and Comparative Example 3 (see FIG. 7). Example 3 did not have the hook member, and Comparative Example 4 (see FIG. 8). Examples 4 and 5 did not have the hook member height and different adhesive materials, and compared to Example 1, they were used (see FIG. 9). Comparative Example 5 (see FIG. 9) was a commercially available product without a hook member (Unicharm Corporation's "Sofy Hadaomoi (registered trademark) Fluffy Type 25 cm") (presumably using hot melt as the adhesive layer).

[0038] The magnitude of noise generated during peeling was measured for the above-mentioned Examples 1 to 5 and Comparative Examples 1 to 5. In these measurements, the connecting sheets of Examples 1 to 5 and Comparative Examples 1 to 5 were fixed to napkins, and the napkins were connected to underwear via the connecting sheets. Then, the noise generated when the napkins were peeled off the underwear by hand was measured. The noise was measured using a precision sound level meter manufactured by Rion Co., Ltd. The noise was measured at frequencies from 31.5 to 8000 Hz (dB). The results are shown in Figures 6 to 9.

[0039] The frequencies of noise that users are concerned about as noise are between 500 and 4000 Hz. In Figs. 6 to 8, the results of Examples 1 to 3 at those frequencies are hatched. At those frequencies, in Fig. 6, the noise of Example 1 is smaller than that of Comparative Examples 1 and 2, and the relationship shown in the graph in Fig. 4 holds. Similarly, the relationship shown in the graph in Fig. 4 holds for Example 2 in Fig. 7 and Example 3 in Fig. 8. [Explanation of symbols]

[0040] 1...napkin, 100...connecting sheet, 110...sheet base material, 110a...first main surface, 110b...second main surface, 120...first adhesive layer, 125...second adhesive layer, 130...hook member, 131...post portion, 132...head portion, 132a...lower surface, 150...object, 155...release material.

Claims

1. A connecting sheet that is connected to underwear by being placed over the underwear, a sheet substrate having a first main surface and a second main surface; a first adhesive layer formed on the first main surface of the sheet base; a plurality of hook members protruding in a first direction from the first main surface of the sheet base material and arranged spaced apart from each other in a second direction in which the first main surface extends; The hook member is a column portion extending from the sheet base material in the first direction and protruding from a surface of the first adhesive layer; a head portion extending from a tip end of the column portion in the second direction, an adhesive application section that covers at least the lower surface of the head with an adhesive; the height of the hook member from the first main surface is 170 μm to 330 μm; The adhesive strength of the adhesive material of the first adhesive layer and the adhesive material application portion is 2 (N / 25 mm) to 8 (N / 25 mm).

2. The connecting sheet according to claim 1 , further comprising a second adhesive layer formed on the second main surface of the sheet substrate.

3. The connecting sheet according to claim 1 or 2, wherein a release material is applied to the upper surface of the head of the hook member.

4. The connecting sheet according to any one of claims 1 to 3, which is wound into a roll shape with the first main surface disposed on the outer periphery.

5. A clothing attachment item having a connecting sheet described in any one of claims 1 to 4 on a connecting surface that is connected to the underwear.

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