Hook sheet, and sheet roll

Abstract

To improve unwindability while improving flexibility.SOLUTION: A hook sheet 1 according to one embodiment includes a base material 2, a plurality of hook portions 3 provided on one surface of the base material 2, and an adhesive layer 4 provided on the other surface of the base material 2. The hook portion 3 includes a pillar portion 31 erected from the base material 2 and a head portion 32 provided at a tip of the pillar portion 31. The thickness t1 of the base material is 35 μm or more and 70 μm or less. When the base material is viewed in a plan view, the area of the head portion per cmof the base material is 15000000 μmor more and 23000000 μmor less.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a hook sheet and a sheet roll.

Background Art

[0002] Patent Document 1 discloses, for example, a method for manufacturing an adhesive closure component applied to a baby diaper. Specifically, "According to the disclosure of Claim 1, the engaging means is composed of a shaft portion having an enlarged portion at its end, and a silicon-containing separation or barrier layer is provided in the cavity of the enlarged portion formed to reinforce the individual engaging heads, and the shaft portion is essentially freely held by the silicon-containing separation or barrier layer, and due to the fact that only a small amount of material is added to the silicon-containing separation or barrier layer and / or the separation control means, an effective desired winding and unwinding characteristic structure can be achieved for the strip-shaped adhesive closure structure." There is a description like this. Hook sheets such as adhesive closure components are wound and stored as a sheet roll. In the state of the sheet roll, the engaging means (hook portion) of the hook sheet adheres to the adhesive layer, and when the hook sheet is unwound from the sheet roll, the hook portion is peeled off from the adhesive layer.

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When applying a hook sheet to a sanitary product such as a diaper, the flexibility of the hook sheet is very important, and thinning the hook sheet is advantageous for improving flexibility. However, when the hook sheet is thinned, it is likely to cause problems in peeling when unwinding from the sheet roll, and it becomes difficult to ensure stable quality when unwinding the hook sheet from the sheet roll.

Means for Solving the Problem

[0005] The hook sheet according to one aspect of the present invention includes a base material, a plurality of hook portions provided on one surface of the base material, and an adhesive layer provided on the other surface of the base material. The hook portion includes a column portion erected from the base material and a head portion provided at the tip of the column portion. The thickness of the base material is 35 μm or more and 70 μm or less. When the base material is viewed in plan, the area of the head portion per 1 cm of the base material 2 is 15,000,000 μm 2 or more and 23,000,000 μm 2 or less.

[0006] Since the thickness of the base material is 35 μm or more, the shape stability can be maintained, and since it is 70 μm or less, the flexibility required when used in sanitary products or the like can also be maintained. Also, since the area of the head portion per 1 cm of the base material 2 is 15,000,000 μm 2 or more, it is easy to obtain an appropriate engaging force when engaging with other engaging portions to function as a mechanical fastener. Furthermore, since the area of the head portion per 1 cm of the base material 2 is 23,000,000 μm 2 or less, it is less likely to be overloaded when peeling off from the adhesive layer. As a result, it becomes easy to ensure stable quality when unwinding the hook sheet from the sheet roll.

[0007] The sheet roll according to one aspect of the present invention is formed by winding a hook sheet. The hook sheet includes a base material, a plurality of hook portions provided on one surface of the base material, and an adhesive layer provided on the other surface of the base material. The hook portion includes a column portion erected from the base material and a head portion provided at the tip of the column portion. The thickness of the base material is 35 μm or more and 70 μm or less. When the base material is viewed in plan, the area of the head portion per 1 cm of the base material 2 is 15,000,000 μm 2 or more and 23,000,000 μm 2 or less.

[0008] According to this sheet roll, it becomes easy to ensure stable quality when the hook sheet is unrolled from the sheet roll.

Effects of the Invention

[0009] According to one aspect of the present invention, it becomes easy to ensure stable quality when the hook sheet is unrolled from the sheet roll.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Modes for Carrying Out the Invention

[0011] The hook sheet according to one aspect of the embodiment includes a base material, a plurality of hook portions provided on one surface of the base material, and an adhesive layer provided on the other surface of the base material. The hook portion includes a column portion erected from the base material and a head portion provided at the tip of the column portion. The thickness of the base material is 35 μm or more and 70 μm or less. When the base material is viewed in plan, the area of the head portion per 1 cm of the base material 2 is 15000000 μm 2 or more and 23000000 μm 2 or less.

[0012] Since the thickness of the base material is 35 μm or more, the shape stability can be maintained, and since it is 70 μm or less, the flexibility required when used in sanitary products or the like can also be maintained. Also, since the area of the head portion per 1 cm of the base material 2 is 15000000 μm 2 or more, it is easy to obtain an appropriate engaging force when engaging with other engaging portions and functioning as a mechanical fastener. Furthermore, per 1 cm of the base material2 The area of the hitting head is 23000000 μm 2 Since it is 23000000 μm or less, it is difficult to become overloaded when peeling from the adhesive layer. As a result, it becomes easy to ensure stable quality when unrolling the hook sheet from the sheet roll.

[0013] In the above hook sheet, a SUS steel sheet that has been subjected to bright heat treatment after cold rolling is used as a test plate for surface finishing. The test plate has a surface roughness with an arithmetic mean roughness of 50 ± 25 μm. The hook sheet is adhered to the test plate, and the adhesive strength of the adhesive layer when pulled in a direction orthogonal to the test plate may be 4 N / cm or more and 10 N / cm or less. When forming a sheet roll, it becomes easy to ensure a desired adhesive strength while suppressing the load required for unrolling the hook sheet.

[0014] The head of the hook member has an overhang that projects with respect to the column portion, and the overhang dimension of the overhang may be 70 μm or more and 120 μm or less. When functioning as a mechanical fastener, it becomes easy to ensure a desired engaging force.

[0015] The overhang may project in both directions facing the column portion. By projecting in both directions, when the hook portion is engaged with another engaging portion as a mechanical fastener, the non-uniformity of the engaged state is reduced by engagement from both sides instead of one-sided offset engagement.

[0016] The thickness of the base material may be 45 μm or more. This is advantageous in ensuring strength stability when unrolling from the sheet roll.

[0017] The base material may contain polyolefin.

[0018] The sheet roll according to one aspect of the embodiment is formed by winding a hook sheet. The hook sheet includes a base material, a plurality of hook portions provided on one surface of the base material, and an adhesive layer provided on the other surface of the base material. The hook portion includes a column portion erected from the base material and a head portion provided at the tip of the column portion. The thickness of the base material is 35 μm or more and 70 μm or less. When the base material is viewed in a plan view, 1 cm of the base material 2 The area of the head per hit is 15,000,000 μm 2 Or more and 23,000,000 μm 2 Or less.

[0019] According to this sheet roll, it is easy to ensure stable quality when the hook sheet is unwound from the sheet roll.

[0020] The hook sheet may be wound so that the adhesive layer faces the inner side close to the core and the hook portion faces the outer side far from the core. The outermost peripheral surface becomes the hook portion, making it easier to handle.

[0021] Hereinafter, the embodiment will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same or equivalent elements are denoted by the same reference numerals, and redundant descriptions are omitted.

[0022] As shown in FIG. 1, the hook sheet 1 according to the embodiment is wound around the core 10a multiple times to form a sheet roll 10, and is maintained and stored in the state of the sheet roll 10. When applied to a sanitary product such as a diaper 100, the hook sheet 1 is pulled out from the sheet roll 10 by a processing device or the like. The sheet roll 10 is cut out into a predetermined shape applicable to the ear portion 101 of a disposable diaper 100, for example, and adhered to the ear portion 101. The hook sheet 1 includes hook portions 3 and is detachably fixed by engaging with an engaging portion 105 provided on another part of the diaper 100 (see FIG. 4) to form a mechanical fastener.

[0023] As shown in FIG. 2, the hook sheet 1 includes a base material 2, a hook portion 3 provided on one surface of the base material 2, and an adhesive layer 4 provided on the other surface of the base material 2. The hook portion 3 corresponds to one engaging portion 101a out of a pair of engaging portions 105 and 101a that form a mechanical fastener. The mechanical fastener broadly includes, for example, a structure called a surface fastener or a Hook and loop fastener, and means a fastener that can be attached and detached on a surface. The other engaging portion 105 is a loop or the like (not shown) that physically engages with the hook portion 3, which is one engaging portion.

[0024] The base material 2 is in a sheet shape with a thickness thinner than the width dimension. The base material 2 is formed from a resin material such as poly(ethylene terephthalate), polyamide such as nylon, poly(styrene-acrylonitrile), poly(acrylonitrile-butadiene-styrene), polyolefin such as polypropylene, plasticized polyvinyl chloride, and polyester. The thickness t1 of the base material 2 is 35 μm or more and 70 μm or less. The thickness t1 of the base material 2 may be 45 μm or more, or may be 50 μm or more. Also, the thickness t1 of the base material 2 may be 60 μm or less, or may be 50 μm or less.

[0025] As shown in FIGS. 2 and 3, the hook portion 3 includes a column portion 31 erected from the base material 2 and a head portion 32 provided at the tip of the column portion 31. The head portion 32 protrudes laterally with respect to the column portion 31, and in particular, includes an overhang 32a that protrudes in both opposing directions. By providing the overhang 32a, it is engaged with and held by the other engaging portion 105 (see FIG. 4). The larger the protruding dimension d of the overhang 32a, the stronger the engaging force tends to be.

[0026] The arrangement of the plurality of hook portions 3 with respect to the base material 2 may be an arrangement having regularity such as a grid pattern or a staggered pattern, or may be an irregular random arrangement. As the material of the hook portion 3, for example, polyamides such as poly(ethylene terephthalate) and nylon, polyolefins such as poly(styrene-acrylonitrile), poly(acrylonitrile-butadiene-styrene), and polypropylene, plasticized PVC, polyesters, etc. are adopted. Note that the hook portion 3 may be formed of the same material as the base material 2 or a different material and may be integrally formed with the base material 2. Also, the density at which the hook portions 3 are arranged can be, for example, about 500 to 5000, about 800 to 4000, or about 1000 to 3000 per square inch (25.4 mm square).

[0027] For the adhesive layer 4, for example, a synthetic rubber-based adhesive can be used. The adhesive force of the adhesive layer 4 only needs to have an adhesive force that enables the hook sheet 1 to adhere to a desired member such as the ear portion 101. For example, this adhesive force can be 4 N / cm or more and 10 N / cm or less. Within this range, the applicable range for adhesion without additional use of an adhesive or the like between the desired member and the hook sheet 1 is expanded. Also, this adhesive force can be 5 N / cm or more and 8 N / cm or less, and can be 5 N / cm or more and 7 N / cm or less. As a supplement, in relation to the object to be adhered, when the adhesive force is weak, the adhesive force can be appropriately reinforced by applying an adhesive or the like.

[0028] Here, the method for measuring the adhesive force of the adhesive layer 4 will be described. When measuring the adhesive force, the method for measuring the adhesive force specified in JIS is implemented (JIS Z 0237). Specifically, as the test plate to which the hook sheet 1 is adhered, the test plate specified in JIS G4305 is used. That is, a SUS steel plate that has been subjected to bright heat treatment after cold rolling is used as the test plate with a surface finish. The surface roughness of this test plate has an arithmetic mean roughness of 50 ± 25 μm. When measuring the adhesive force, a hook sheet 1 of a predetermined size is adhered to the test plate. Next, using a device equivalent to the tensile test device specified in JIS, the hook sheet 1 is pulled in a direction orthogonal to the test plate to measure the adhesive force.

[0029] The thickness t2 of the adhesive layer 4 may be 300 μm or less. One reason for this thickness t2 being 300 μm or less is to balance it with the thickness t1 of the base material 2. The thickness t2 of the adhesive layer 4 may be 5 μm or more. One reason for this thickness t2 being 5 μm or more is that it is a thickness that can function as the adhesive layer 4 and also from the perspective of manufacturing stability.

[0030] Next, referring to FIG. 3, the dimensional relationship of the hook portion 3 will be described. The dimension h from the surface of the base material 2 to the tip of the hook portion 3 (the apex portion of the head portion 32) may be 100 to 800 μm. One reason for this dimension being 100 μm or more is from the perspective of ensuring the engaging force as a mechanical fastener. The reason for this dimension being 800 μm or less is from the perspective of suppressing the discomfort (for example, pain) when touching with a finger or the like.

[0031] Among the outer diameters of the head portion 32 of the hook portion 3, the maximum dimension La may be 100 to 1000 μm, or 200 to 500 μm. When this dimension La is 200 μm or more, it becomes easier to engage with another engaging portion 105 having a fibrous loop or the like when functioning as a mechanical fastener. When this dimension La is 500 μm or less, it becomes easier to enter into the fibers of another engaging portion 105.

[0032] In particular, the overhang dimension d of the overhang 32a of the head 32 may be 70 μm or more and 120 μm or less. When this dimension d is 70 μm or more, it can tightly engage with the fibers of the other engaging portion 105, further enhancing the holding property and stability during engagement. Also, when this dimension La is 500 μm or less, the overhang 32a is more likely to enter into the loop-shaped fibers of the other engaging portion 105. Further, the dimension d may be 90 μm or more and 100 μm or less.

[0033] The thickness t3 of the head 32 of the hook portion 3 may be 10 to 200 μm or 30 to 150 μm. When this thickness t3 is 30 μm or more, the engagement state with the fibers of the other engaging portion 105 can be maintained. When this thickness t3 is 150 μm or less, it can enter into the fibers of the other engaging portion 105.

[0034] Among the outer diameters of the column portion 31 of the hook portion 3, the minimum dimension Lb may be 50 to 500 μm or 100 to 300 μm. When this dimension Lb is 100 μm or more, the posture of the hook portion 3 can be maintained. When this dimension Lb is 300 μm or less, the dimension between the outer peripheral edge of the head 32 can be ensured, making it easier to engage the fibers of the other engaging portion 105 with the head 32.

[0035] It should be noted that the above-mentioned various dimensions may be appropriately set within the scope of the gist of the invention according to various factors such as the size and density of the hook portion 3 and the type of other engaging portions. Also, the heights of all the hook portions 3 may be the same (variations within the range of manufacturing errors are allowed), or the heights may be different between some regions and other regions. Further, the shape of the hook portion 3 may also be appropriately set, and for example, it may be circular or polygonal instead of elliptical.

[0036] Next, with reference to FIG. 4, the correspondence applied to the ear portion 101 of the diaper 100 will be described. The diaper 100 is an example of a sanitary product, and an open-type diaper 100 is cited.

[0037] The diaper 100 includes a rectangular main body portion 102 that includes an outer liquid-impermeable polymer film and an inner liquid-absorbing layer. The main body portion 102 is a portion that covers across the crotch of a wearer such as an infant. Irregular pleats are formed on both side portions of the main body portion 102, and stretchable gather portions 102a are provided.

[0038] On one longitudinal end of the main body portion 102, a ventral fixing portion 103 that contacts the abdomen (lower abdomen) of the wearer is provided, and on the other end, a dorsal fixing portion 104 that contacts the back (waist) of the wearer is provided. In the ventral fixing portion 103 and the dorsal fixing portion 104, the side that contacts the wearer is the inner side, and the opposite side is the outer side.

[0039] On the outer surface of the ventral fixing portion 103, an engaging portion 105 of a mechanical fastener is fixed so as to cover a wide range in the width direction. Ear portions 101 are provided on both side portions in the width direction of the dorsal fixing portion 104. The ear portions 101 are provided with an engaging portion 101a that engages with the engaging portion 105 to form a mechanical fastener. The engaging portion 101a of the ear portion 101 is formed by processing the hook sheet 1 according to the shape of the ear portion 101 and adhering it to a predetermined position of the ear portion 101.

[0040] The diaper 100 is worn on the wearer so as to cover the crotch of the wearer with the main body portion 102, and further, the ventral fixing portion 103 is arranged to contact around the lower abdomen of the wearer, and the dorsal fixing portion 104 is arranged to contact around the waist of the wearer. Next, the left and right ear portions 101 of the diaper 100 are pulled, and the engaging portion 101a of the ear portion 101 is attached to and worn on the engaging portion 105 of the ventral fixing portion 103.

[0041] The above engaging portion 101a (hook sheet 1) is engaged with another engaging portion 105 that forms a mechanical fastener. Further, the load required when disengaging the two by peeling them off is the engaging force. For example, the engaging force generated between the hook sheet 1 according to the present embodiment and the other engaging portion 105 is 0.35 N / cm or more. If the engaging force is 0.35 N / cm or more, stable fixing becomes possible when the hook sheet 1 and the other engaging portion 105 are engaged as a mechanical fastener. Also, the engaging force can be 0.7 N / cm or more, and can be 1.0 N / cm or more. On the other hand, the engaging force can also be 2.0 N / cm or less for ease of disengagement.

[0042] Here, the method for measuring the engaging force will be described. The engaging force was measured according to the following procedure. A loop test piece with a length of 100 mm and a width of 50 mm was placed on a 90-degree shear jig with the non-peeling surface facing the jig. The hook surface (the surface having the hook portion) of a sample test piece with a length of 20 mm and a width of 25 mm having a hook portion was opposed to the loop test piece (the test piece of the other engaging portion), and the hook sample test piece was gently placed on the loop test piece. In the 90-degree shear jig, the surface in contact with the hook test piece is smoothed. A 2.0 kg hand roller was slowly rolled in the width direction at about 300 mm / min on the hook surface for one round. Next, a clip was attached to the end of the paper leader of the hook sample test piece. After hanging a 1 kg weight on the clip for 2 seconds, the weight and the clip were removed. Next, the loop test piece was placed in a 90-degree peeling jig, and the paper end of the hook sample test piece was inserted into the upper opening of a tensile testing machine. The end of the hook portion of the hook sample test piece was positioned directly below the upper opening. A peeling test was performed while pressing down the loop test piece so that it did not move, and the engaging force was measured.

[0043] Next, the sheet roll 10 will be described with reference to FIG. 1. The sheet roll 10 is formed, for example, by winding the hook sheet 1 around the core 10a. In the present embodiment, it is formed by winding the hook sheet 1 around the core 10a. The core 10a may be omitted.

[0044] The hook sheet 1 is wound around the core 10a multiple times such that the inner side closer to the core 10a is the adhesive layer 4 and the outer side farther from the core 10a is the hook portion 3. As a result, the hook portion 3 is disposed on the outer surface that is the outermost circumference of the sheet roll 10, and the adhesive layer 4 is disposed on the inner surface of the outermost circumference. As a result, the sheet roll 10 is easy to handle when being conveyed or installed at a predetermined position of a processing apparatus or the like.

[0045] In the state of the sheet roll 10, the adhesive layer 4 of the hook sheet 1 is adhered to the head 32 of each hook portion 3. Therefore, when the hook sheet 1 is unwound from the sheet roll 10, it is necessary to pull it out while peeling the adhesion between the head 32 of each hook portion 3 and the adhesive layer 4. The force required at this time is the unwinding force. If the unwinding force is too strong, an overload is applied to the hook portion 3, which may cause deformation or breakage. The magnitude of the unwinding force depends on, for example, the area of the head 32 per 1 cm of the base material 2 2 and depends on the area of the head 32 per 1 cm of the base material 2.

[0046] If this area is large, the area adhered to the adhesive layer 4 also becomes large, and a strong unwinding force is required. If the unwinding force is too strong, an overload is applied to the hook portion 3, which may cause deformation or breakage. As a result, the manufacturing stability for processing the hook sheet 1 into a predetermined shape is lacking, and it becomes difficult to ensure stable quality when the hook sheet 1 is unwound from the sheet roll 10. Conversely, if the area of the head 32 per 1 cm 2 of the base material 2 is small, it means that the head 32 is likely to be small. If the head 32 is too small, the engaging force when functioning as a mechanical fastener becomes weak, and the quality stability as a mechanical fastener decreases.

[0047] In the hook sheet 1 according to the present embodiment, when the base material 2 is viewed in a plan view from the hook portion 3 side, the area of the head 32 per 1 cm 2 of the base material 2 is 15,000,000 μm 2 or more and 23,000,000 μm 2 or less. If this area is 23,000,000 μm 2By being as follows, it is difficult to become overloaded when peeling from the adhesive layer 4. As a result, it becomes easy to ensure stable quality when the hook sheet 1 is unwound from the sheet roll 10. Also, 1 cm of the base material 2 2 The area of the head 32 per hit is 15,000,000 μm 2 or more, so it is also advantageous from the viewpoint of quality stability in functioning as a mechanical fastener. Specifically, in the present embodiment, 1 cm of the base material 2 2 The area of the head 32 per hit is 15,000,000 μm 2 or more, and as described above, it becomes easy to adjust the engagement force to 0.35 N / cm or more. As a result, when the hook sheet 1 and another engaging portion 105 are engaged with each other and function as a mechanical fastener, it becomes easy to obtain an appropriate engagement force and stable fixing becomes possible.

[0048] Also, in the sheet roll 10 according to the present embodiment, the unwinding force is 0.984 N / cm (corresponding to 2.5 N / 25 mm) or less. If the unwinding force is 0.984 N / cm or less, it does not become overloaded with respect to the hook portion 3 during unwinding, and stable quality can be ensured. Also, the unwinding force can be 0.787 N / cm (corresponding to 2.0 N / 25 mm) or less, 0.591 N / cm (corresponding to 1.5 N / 25 mm) or less, and 0.394 N / cm (corresponding to 1.0 N / 25 mm) or less. On the other hand, the unwinding force can also be 0.039 N / cm (corresponding to 0.1 N / 25 mm) or more.

[0049] Here, the method for measuring the unwinding force will be described. The measurement of the unwinding force was performed in accordance with the measurement of the adhesive force (JIS Z 0237). Specifically, first, the hook sheet 1 was adhered to a test plate specified in JIS G 4305, and the adhesive layer 4 of the second-layer hook sheet 1 was adhered so as to overlap the hook portion 3 of this hook sheet 1. Next, using a device equivalent to a tensile test device specified in JIS, the second-layer hook sheet 1 was pulled in a direction orthogonal to the first-layer hook sheet 1, and the unwinding force was measured.

[0050] Next, the operation and effects of the hook sheet 1 according to the present embodiment will be described. As described above, since the thickness t1 of the base material 2 of the hook sheet 1 is 35 μm or more, the shape stability can be maintained, and since it is 70 μm or less, the flexibility required when used for sanitary products and the like can also be maintained. Also, the area of the head 32 per 1 cm of the base material 2 2 is 15,000,000 μm 2 or more and 23,000,000 μm 2 or less, so it is difficult to cause an overload when peeling from the adhesive layer 4. As a result, it becomes easy to ensure stable quality when unwinding the hook sheet 1 from the sheet roll 10.

[0051] In the above hook sheet 1, the adhesive force of the adhesive layer 4 may be 4 N / cm or more and 10 N / cm or less. By setting the adhesive force of the adhesive layer 4 within this range, it becomes easy to ensure a desired adhesive force while maintaining peelability when forming the sheet roll 10.

[0052] Also, the head 32 of the hook portion 3 is provided with an overhang 32a that protrudes with respect to the column portion 31, and the overhang dimension d of the overhang 32a may be 70 μm or more and 120 μm or less. As a result, when functioning as a mechanical fastener, it becomes easy to ensure a desired engaging force.

[0053] The overhang 32a may protrude in both directions facing the column portion 31. When the hook portion 3 is engaged with another engaging portion 105 as a mechanical fastener by the overhang 32a protruding in both directions, the unevenness of the engaged state is reduced by the engagement from both sides instead of the offset engagement on only one side.

[0054] Also, if the thickness of the base material 2 of the hook sheet 1 is 45 μm or more, it is advantageous in ensuring the strength stability when unwinding from the sheet roll 10.

Example

[0055] Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.

[0056] [Example 1] The base material and the hook part of the hook sheet according to Example 1 are made of PP (polypropylene), and the adhesive layer is made of synthetic rubber. The area of the base material was 100 cm 2 . The dimensional thickness of the base material was 60 μm. The head of the hook part according to Example 1 has an overhang that projects in both opposing directions centered on the column part. Among the overhangs projecting in both directions, the projecting dimension of one overhang was 80 μm. The density of the hook part according to Example 1 was 1,600 per square inch.

[0057] In the plan view when the hook sheet according to Example 1 is viewed from the hook part side, the area of the head per 1 square centimeter of the base material ("head area" in Table 1), the unwinding force and the engaging force of the hook sheet according to Example 1 are as shown in Table 1.

[0058] [Example 2] The base material and the hook part of the hook sheet according to Example 2 are made of PP, and the adhesive layer is made of synthetic rubber. The area of the base material was 100 cm 2 . The dimensional thickness of the base material of the hook sheet according to Example 2 was 60 μm. The head of the hook part according to Example 2 has an overhang that projects in both opposing directions centered on the column part. Among the overhangs projecting in both directions, the projecting dimension of one overhang was 110 μm. The density of the hook part according to Example 2 was 1,600 per square inch.

[0059] In the plan view when the hook sheet according to Example 2 is viewed from the hook part side, the area of the head per 1 square centimeter of the base material ("head area" in Table 1), the unwinding force and the engaging force of the hook sheet according to Example 2 are as shown in Table 1.

[0060] [Example 3] The hook sheet according to Example 3 is the same as the hook sheet according to Example 2, except for the overhang dimension. The overhang dimension of one of the hook parts according to Example 3 was 95 μm. The density of the hook part according to Example 3 was 1,600 per square inch.

[0061] In a plan view when the hook sheet according to Example 3 is viewed from the hook part side, the area of the head per 1 square centimeter of the base material ("head area" in Table 1), the unwinding force and the engaging force of the hook sheet according to Example 3 are as shown in Table 1.

[0062] [Comparative Example 1] The base material and the hook part of the hook sheet according to Comparative Example 1 are made of PP, and the adhesive layer is made of synthetic rubber. The area of the base material was 100 cm 2 The dimensional thickness of the base material of the hook sheet according to Comparative Example 1 was 60 μm. The head of the hook part according to Comparative Example 1 has overhangs that project in both directions facing each other around the column part. Among the overhangs projecting in both directions, the overhang dimension of one of the overhangs was 45 μm. The density of the hook part according to Comparative Example 1 was 1,600 per square inch.

[0063] In a plan view when the hook sheet according to Comparative Example 1 is viewed from the hook part side, the area of the head per 1 square centimeter of the base material ("head area" in Table 1), the unwinding force and the engaging force of the hook sheet according to Comparative Example 1 are as shown in Table 1.

[0064] [Comparative Example 2] The base material and the hook part of the hook sheet according to Comparative Example 2 are made of PP, and the adhesive layer is made of synthetic rubber. The area of the base material was 100 cm 2It was. The dimensional thickness of the base material of the hook sheet according to Comparative Example 2 was 85 μm. The head of the hook portion according to Comparative Example 2 has an overhang that projects in both opposing directions centered on the column portion. Among the overhangs projecting in both directions, the projecting dimension of one overhang was 110 μm. The density of the hook portion according to Comparative Example 1 was 1,600 per square inch.

[0065] In the plan view when the hook sheet according to Comparative Example 2 is viewed from the hook portion side, the area of the head per square centimeter of the base material ("head area" in Table 1), the unwinding force and the engaging force of the hook sheet according to Comparative Example 2 are as shown in Table 1.

[0066] [Comparative Example 3] The hook sheet according to Comparative Example 3 is the same as the hook sheet according to Comparative Example 2 except for the projecting dimension of the overhang. The projecting dimension of one overhang of the hook portion according to Comparative Example 3 was 90 μm. The density of the hook portion according to Comparative Example 3 was 1,600 per square inch.

[0067] In the plan view when the hook sheet according to Comparative Example 3 is viewed from the hook portion side, the area of the head per square centimeter of the base material ("head area" in Table 1), the unwinding force and the engaging force of the hook sheet according to Comparative Example 3 are as shown in Table 1.

[0068] [Comparative Example 4] The hook sheet according to Comparative Example 4 is the same as the hook sheet according to Comparative Example 2 except for the projecting dimension of the overhang. The projecting dimension of one overhang of the hook portion according to Comparative Example 4 was 17.5 μm. The density of the hook portion according to Comparative Example 4 was 1,600 per square inch.

[0069] In the plan view when the hook sheet according to Comparative Example 4 is viewed from the hook portion side, the area of the head per square centimeter of the base material ("head area" in Table 1), the unwinding force and the engaging force of the hook sheet according to Comparative Example 4 are as shown in Table 1.

[0070] [Comparative Example 5] The base material and the hook portion of the hook sheet according to Comparative Example 5 are made of PP, and the adhesive layer is made of synthetic rubber. The area of the base material was 100 cm 2 . The dimensional thickness of the base material of the hook sheet according to Comparative Example 5 was 45 μm. The head of the hook portion according to Comparative Example 5 has an overhang that projects in both directions facing each other around the column portion. Among the overhangs projecting in both directions, the projection dimension of one overhang was 65 μm. The density of the hook portion according to Comparative Example 5 was 3,500 pieces per square inch.

[0071] In the plan view when the hook sheet according to Comparative Example 5 is viewed from the hook portion side, the area of the head per square centimeter of the base material ("head area" in Table 1), the unwinding force and the engaging force of the hook sheet according to Comparative Example 5 are as shown in Table 1.

[0072]

Table 1

[0073] [Flexibility] It was confirmed that Examples 1 to 3 and Comparative Example 1 ensured appropriate flexibility. On the other hand, it was confirmed that Comparative Examples 2 to 4 were too hard to handle. On the other hand, it was confirmed that Comparative Example 5 was too soft and lacked shape stability.

[0074] [Unwinding force] "A" in Table 1 indicates that the unwinding force was good and there was no defect in the hook portion. On the other hand, "B" in Table 1 indicates the case where some defect occurred in the hook portion. Examples 1 to 3 and Comparative Examples 1 and 4 were evaluated as "A". Comparative Examples 2, 3, and 5 were all evaluated as "B".

[0075] [Engaging force] "A" in Table 1 indicates that the engaging force is appropriate, and "B" in Table 1 indicates the case where the engaging force is inappropriate. Examples 1 to 3 and Comparative Examples 2 and 3 were evaluated as "A". Comparative Examples 1, 4, and 5 were evaluated as "B".

Description of Reference Numerals

[0076] 1... hook sheet, 2... base material, 3... hook portion, 4... adhesive layer, 10... sheet roll, 31... column portion, 32... head portion, 32a... overhang, t1... thickness of the base material, d... overhang projection dimension.

Claims

1. A base material, a plurality of hook portions provided on one surface of the base material, and an adhesive layer provided on the other surface of the base material, comprising: The hook portion includes a column portion erected from the base material and a head portion provided at the tip of the column portion, and is a hook sheet wound in a roll shape such that the adhesive layer faces the inner side closer to the core and the hook portion faces the outer side farther from the core. The thickness of the base material is 45 μm or more and 70 μm or less. When the base material is viewed in a plan view, 1 cm of the base material ２ The area of the head per is 15,000,000 μm ２ or more and 23,000,000 μm ２ or less, Using a SUS steel sheet that has been subjected to bright heat treatment after cold rolling as a test plate with a surface finish, the test plate has a surface roughness with an arithmetic mean roughness of 50 ± 25 μm. The hook sheet is adhered to the test plate, and the adhesive strength of the adhesive layer when pulled in a direction orthogonal to the test plate is 4 N / cm or more and 10 N / cm or less.

2. The hook sheet according to claim 1, wherein the thickness of the adhesive layer is 5 μm or more and 300 μm or less.

3. The hook sheet according to claim 1 or 2, wherein the head portion has an overhang protruding with respect to the column portion, and the protruding dimension of the overhang is 70 μm or more and 120 μm or less.

4. The hook sheet according to claim 3, wherein the overhang protrudes in both directions facing the column portion.

5. The hook sheet according to any one of claims 1 to 4, wherein the base material contains polyolefin.

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