Adhesive tape

Abstract

In order to provide an adhesive tape in which adhesive residue is inhibited, an adhesive tape is used which has a base material (10) having a base cloth (1) composed of warp yarns and weft yarns, a first laminated layer (2) formed on a first face (1A) of the base cloth, and a second laminated layer (3) formed on a second face (1B) of the base cloth, and an adhesive layer (6) formed as the outermost layer on the face side of the base material (10) on which the first laminated layer (2) is formed. On the face of the first laminated layer on the side opposite the base cloth, concavities and convexities (2B) are formed by the warp yarns and weft yarns.

Description

Technical Field

[0001] This invention relates to adhesive tape suitable for use as a packaging material and a maintenance material. Background Technology

[0002] High-adhesion adhesive tapes are widely used for securing, bundling, or masking materials in a wide range of fields, including agriculture, civil engineering, construction, and transportation. Furthermore, for ease of handling, such adhesive tapes require adequate substrate strength and tearability. Patent Document 1 discloses an adhesive tape with improved tearability.

[0003] Patent Document 1 describes an adhesive tape formed as follows: a knitted fabric is formed by inserting flat yarns, primarily made of thermoplastic resin, into the warp yarns of independently knitted multifilament yarns. An anchoring layer, either chemically or physically, is formed on one side or the back side of the knitted fabric. A knitted fabric substrate is formed by laminating thermoplastic resin onto one or both sides of the anchoring layer in a molten or dry film state. A pressure-sensitive adhesive is then applied to one or both sides of the knitted fabric substrate to form the adhesive tape. Furthermore, specific values ​​are specified for the longitudinal / transverse tensile strength, longitudinal / transverse tear strength, and longitudinal elongation.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2002-294189 Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] Conventional adhesive tapes typically have the following structure: a thermoplastic resin laminate covers the surface of such a base fabric, and an adhesive layer is formed through a primer layer. With such adhesive tapes, when peeling them off after they have been applied to the substrate, the adhesive sometimes peels off from the laminate and remains on the substrate (hereinafter, this phenomenon is referred to as "adhesive residue").

[0009] If adhesive residue occurs, the surface of the bonded object will be contaminated by the adhesive, and the operation of wiping off the adhesive residue on the surface of the bonded object will result in a decrease in the efficiency of the packaging and curing operations.

[0010] Furthermore, adhesive tape is typically supplied in rolled form. However, in this case, the rolled adhesive layer will come into contact with the side of the substrate opposite to the side where the adhesive layer forms. If adhesive residue forms on this opposite side, insufficient adhesive will adhere to the surfaces of the adhered objects, sometimes resulting in gaps or reduced adhesion. Additionally, if adhesive residue remains on the surface of the adhesive tape opposite to the adhesive layer, it will impair the processability of the tape roll, sometimes compromising its intended use when applied to the adhered objects.

[0011] Therefore, the object of the present invention is to provide an adhesive tape that suppresses such adhesive residue.

[0012] Methods for solving problems

[0013] The inventors have discovered that adhesive residue can be suppressed by forming irregularities in the adhesive tape on the surface of the laminate that fixes the adhesive layer.

[0014] That is, the present invention includes the following methods.

[0015] [1] An adhesive tape, having the following characteristics:

[0016] The substrate comprises a base fabric composed of warp and weft yarns, a first laminate formed on a first surface of the base fabric, and a second laminate formed on a second surface of the base fabric.

[0017] The adhesive layer is formed as the outermost layer on the side of the substrate where the first laminate has been formed.

[0018] On the side of the first laminate opposite to the base fabric, there are irregularities formed by the warp and weft yarns.

[0019] [2] According to the adhesive tape described in [1], the side of the second laminate opposite to the base fabric is a smooth surface.

[0020] [3] The adhesive tape according to [1] or [2], wherein a primer layer is formed between the first laminate and the adhesive layer.

[0021] [4] According to the adhesive tape described in [3], the surface of the first laminate is subjected to corona treatment, and the primer layer is formed on the corona-treated surface.

[0022] [5] The adhesive tape according to any one of [1] to [4], wherein the first and second sides of the base fabric are corona-treated surfaces.

[0023] [6] The adhesive tape according to any one of [1] to [5], wherein a backing agent layer is provided on the side of the second laminate opposite to the base fabric.

[0024] [7] The adhesive tape according to any one of [1] to [6], wherein the warp yarn is multifilament,

[0025] The weft yarns mentioned above are flat yarns.

[0026] [8] The adhesive tape according to any one of [1] to [7], wherein the warp yarn is a polyester multifilament.

[0027] [9] The adhesive tape according to any one of [1] to [8], wherein the first laminate and the second laminate contain a thermoplastic resin comprising polyethylene.

[0028]

[10] According to the adhesive tape described in [9], wherein the weft yarn is a flat yarn made of polyethylene.

[0029]

[11] The adhesive tape according to any one of [1] to

[10] , wherein the base fabric is a warp-knitted fabric formed by inserting the weft yarn into a loop structure formed by the warp yarn.

[0030]

[12] According to the adhesive tape described in

[11] , wherein the above-mentioned coil structure is an independent chain stitch.

[0031]

[13] According to the adhesive tape of

[11] or

[12] , wherein the first laminate is formed on the base fabric and one warp yarn is exposed on the surface of the weft yarn.

[0032] The second laminate is formed on the base fabric, where the second side of the two warp yarns is exposed on the surface of the weft yarn.

[0033] Invention Effects

[0034] In the adhesive tape of the present invention, by providing unevenness on the surface of the first laminate, the contact area between the first laminate and the adhesive layer is increased. This improves the bonding strength between the first laminate and the adhesive layer, suppressing adhesive residue. Furthermore, by smoothing the surface of the second laminate, when the adhesive tape is wound, the difference in bonding strength between the surface of the second laminate in contact with the adhesive layer and the first laminate in bond with the adhesive layer further suppresses adhesive residue on the surface of the second laminate. Attached Figure Description

[0035] [ Figure 1 The figures shown are examples of base fabrics. (a) shows an example of a plain weave base fabric, and (b) shows an example of a warp-knitted base fabric.

[0036] [ Figure 2 This is a schematic diagram illustrating a lamination process according to one embodiment of the present invention.

[0037] [ Figure 3 This is a cross-sectional view illustrating the manufacturing process of an adhesive tape according to one embodiment of the present invention.

[0038] [ Figure 4 This is a schematic cross-sectional view illustrating the cross-sectional structure of an adhesive tape according to one embodiment of the present invention. Detailed Implementation

[0039] <Kib>

[0040] As the base fabric used in the adhesive tape of the present invention, a woven or knitted fabric composed of long-fiber warp and weft yarns can be used. The fabric structure of the woven fabric can be selected from plain weave, twill weave, satin weave, etc., depending on various characteristics such as cutting direction and strength. Furthermore, the knitted fabric used in the adhesive tape of the present invention is preferably a fabric having a structure in which a continuous loop is formed by one of the warp and weft yarns, and the other yarn is inserted through that loop. Which of the warp / weft yarns is formed into a loop is determined based on the hand-tear-based cutting direction of the adhesive tape, and the direction perpendicular to the yarn forming the loop is taken as the hand-tear direction. It should be noted that the warp yarns described below are yarns whose elongation direction is configured to be approximately parallel to the length direction of the adhesive tape, and the weft yarns are yarns whose elongation direction is configured to be approximately perpendicular to the length direction of the adhesive tape.

[0041] Figure 1 In the example of base fabric 1, plain weave base fabric (a) and warp-knitted base fabric (b) are shown. By having such a structure, unevenness is formed on the surface through the crossing and interlacing of warp yarns 11 and weft yarns 12. It should be noted that... Figure 1 In (b), an independent chain stitch structure is shown as a coil structure based on warp yarn 11, but it is not limited to this. For example, it can be a single comb warp denbigh structure as disclosed in Japanese Patent Application Publication No. 2014-210998. Other known coil structures can also be used in the same way.

[0042] As such a base fabric, a warp-knitted fabric is formed by inserting weft yarns into a loop structure formed by warp yarns. The loop structure is used as an independent chain stitch. A first laminate is formed on a first surface where one warp yarn is exposed on the surface of the weft yarn, and a second laminate is formed on a second surface where two warp yarns are exposed on the surface of the weft yarn. Thus, on the first surface, the contact area between the weft yarn and the laminate can be increased, and the laminate peeling can be suppressed.

[0043] (warp yarn)

[0044] There are no particular restrictions on the warp yarn; any material suitable for this field can be used. This includes polyolefin resins such as polyethylene and polypropylene, polyester resins such as polyethylene terephthalate and polybutylene terephthalate, thermoplastic resins such as acrylic resins and polyamide resins, cupro fiber, regenerated fibers such as viscose rayon, and semi-synthetic fibers such as acetate and triacetate. Among these, polyester fibers have lower yarn stretch compared to other thermoplastic synthetic fibers such as polypropylene and nylon. Therefore, when hand-tearing along the width of the adhesive tape, it can suppress warp yarn elongation and prevent burrs and unraveling at the cross-section.

[0045] When using these fibers as warp yarns, multifilament yarns are preferred as the fiber form. This ensures moderate tearability while maintaining the longitudinal strength of the adhesive tape. A base fabric with a denier of 10–1000, preferably 20–500, and a warp density of 10–50 threads per inch offers good balance in terms of base fabric strength, tearability, and stretchability.

[0046] (Weft yarn)

[0047] There are no particular restrictions on the weft yarn; any material suitable for use in this field can be used, and the same material as the warp yarn can be used. As for the fiber form, flat yarn is preferred to ensure tearability and suppress burrs at the cut surface. Flat yarn can be obtained by melting and extruding thermoplastic resin from a T-die or a circular die to form a film, and then processing the formed film into a finer width. A base fabric with a fineness of 30–1000 denier, preferably 50–500 denier, and a weft density of 5–40 threads per inch, preferably 8–30 threads per inch, exhibits good balance between substrate strength, tearability, and thermal degradation during lamination.

[0048] For this base fabric, the surface that forms the first laminate as described later is called the first surface, and the surface that forms the second laminate as described later, opposite to the first surface, is called the second surface.

[0049] To improve adhesion to the laminate and suppress lamination (referred to as "laminate peeling"), the first and second sides of the base fabric can be treated with physical or chemical methods, also known as anchoring treatment. Examples of physical treatments include corona treatment, UV treatment, and sputtering treatment, while examples of chemical treatments include coating with resins selected from organotitanium, isocyanate, polyethyleneimine, and polybutadiene.

[0050] <Laminated Layer>

[0051] The laminate is formed by extending a resin material on both sides of a base fabric. When a thermoplastic resin is chosen as the material for both the warp and weft yarns, it is preferable to choose the same resin material as the laminate to suppress lamination. For example, when using polyethylene weft yarns, by also using a thermoplastic resin containing polyethylene in the laminate, a stable bonding force between the laminate and the base fabric can be obtained. The thickness of the laminate can be selected from the range of 5 to 300 μm. In particular, the first laminate, which reflects the unevenness of the base fabric, is appropriately chosen to be of the most suitable thickness depending on the type of base fabric, and the second laminate, which is planarized, is formed to a thickness greater than or equal to the thickness required to offset the unevenness of the base fabric.

[0052] use Figure 2 and Figure 3 This will illustrate the method for forming laminated layers. It should be noted that... Figure 3 The diagram shows a first surface 1A of a base fabric 1 where a first laminate 2 is formed on the surface of the base fabric 1 with one warp yarn 11 exposed on the weft yarn 12, and a second surface 1B of a base fabric 1 where a second laminate 3 is formed on the base fabric 1 with two warp yarns 11 exposed on the surface of the weft yarn 12.

[0053] First, such as Figure 2 As shown, using an extrusion laminator 20, resin material 24 is supplied from the extruder 21 through a T-die 22 to the first surface 1A of the base fabric 1 formed by warp yarns 11 and weft yarns 12. The resin material 24, together with the base fabric 1, is pushed against a cooling roller 26 by a rubber pressure roller 25, thus bonding the resin material 24 to the base fabric 1. Here, when bonding the resin material 24 to the first surface 1A, a matte roller 27 with an uneven surface is used as the cooling roller 26, thereby achieving the desired effect. Figure 3 As shown in (a), in the case of knitted fabric, when the first laminate 2 having a matte surface 2A is formed on the base fabric 1 and a first surface 1A of a warp yarn 11 is exposed on the surface of the weft yarn 12, the unevenness of the base fabric is easily reflected in the process described later, and is therefore preferred.

[0054] Next, the surface is flipped over, and resin material 24 is bonded to the second surface 1B of the base fabric 1 using the same method as the first surface 1A. As the cooling roller 26 at this time, a so-called mirror roller 28, whose surface has been mirror-finished, is used to achieve the desired effect. Figure 3 As shown in (b), a second laminate 3 with a smooth surface 3A can be formed. The outer surface of the second laminate 3 is not limited to the smooth surface 3A, and a material layer that becomes a smooth surface can be further formed, or a release treatment can be performed on the matte surface to improve the release properties.

[0055] Here, when the resin material already bonded to the second surface 1B of the base fabric 1 is pressed towards the mirror roller 28 by the rubber pressure roller 25, the matte surface 2A in contact with the pressure roller 25 becomes a first laminate 2 with an uneven surface 2B reflecting the unevenness of the warp yarns 12 and weft yarns 11. By making the surface of the first laminate 2 uneven 2B as described above, the formation of... Figure 4 When the adhesive layer 6 is shown, the bonding area between the first laminate 2 and the adhesive layer 6 is increased, which can effectively suppress adhesive residue.

[0056] When the uneven surface is formed on the first laminate 2 in the manner described above, uneven surfaces originating from the matte roller 27 and from the warp yarns 12 and weft yarns 11 are formed on the uneven surface 2B. To avoid affecting the bonding surface between the adhesive layer 6 and the bonded object, it is preferable that the average depth of the recesses from the matte roller is 1 μm or more and less than 10 μm. Furthermore, to increase the bonding area with the adhesive layer 6 and to avoid affecting the bonding surface between the adhesive layer 6 and the bonded object, it is preferable that the average depth of the recesses from the warp yarns 12 and weft yarns 11 is 10 μm or more and less than 20 μm.

[0057] In the above manufacturing method, the first side 1A and the second side 1B of the base fabric 1 can be subjected to surface treatment (anchoring treatment) by physical or chemical means. Examples of physical treatments include corona treatment, UV treatment, and sputtering treatment, while examples of chemical treatments include coating with a resin selected from organotitanium, isocyanate, polyethyleneimine, and polybutadiene. Figure 2 The diagram shows the method of processing using the corona treatment device 23.

[0058] As Figure 4 The schematic cross-sectional view illustrates the structure of an adhesive tape according to one embodiment of the present invention. Figure 4 In the structure shown, the following example is shown: For a substrate 10 formed by forming laminates (first laminate 2 and second laminate 3) on both sides of a base fabric 1, a primer layer 4 and an adhesive layer 6 are formed on the first laminate side, and a backing agent layer 5 is formed on the second laminate 3 side.

[0059] <Primer Layer>

[0060] To improve adhesion to the adhesive layer, a layer can be formed on the surface of the first laminate 2 formed as described above. Figure 4The primer layer 4 is as shown. Examples of primers include coatings of various elastomers (e.g., copolymers of ethylene and vinyl acetate, chlorinated polypropylene, reactants of styrene-butadiene copolymers and phenolic resins, butyl acrylate, vinyl acetate, acrylamide, reactants of natural or synthetic rubber, etc.) and coatings of various primers. Alternatively, the primer layer 4 can be formed by modifying the surface of the first laminate 2 using corona treatment, etching, plasma treatment, sandblasting, etc., or by modifying the surface of the first laminate 2 using corona treatment, etc. The thickness of the primer layer is such that the unevenness in the first laminate 2 is reflected on the outer surface of the primer layer without compromising the effect of inhibiting adhesive residue caused by the unevenness.

[0061] <Adhesive layer>

[0062] As described above, the adhesive layer 6 is formed directly on the first laminate 2 with its uneven surface, or formed in between the primer layer 4, serving as the outermost layer on the side of the substrate 10 where the first laminate is formed. As the adhesive, a suitable selection from known adhesive compositions can be used to achieve the desired adhesive strength. The adhesive layer 6 contains a base polymer (referred to as the adhesive base polymer) as an adhesive component. There are no particular limitations on the adhesive base polymer; acrylic adhesives and rubber-based adhesives can be used. Examples of acrylic adhesives include those made by copolymerizing monomers containing functional groups such as methyl methacrylate, ethyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, 2-ethylhexyl methacrylate, isooctyl methacrylate, nonyl methacrylate, and isononyl methacrylate as the main components, and copolymerizing monomers containing functional groups such as methacrylic acid, crotonic acid, fumaric acid, itaconic acid, and maleic anhydride, vinyl acetate, acrylonitrile, styrene, 2-hydroxyethyl methacrylate, and 2-hydroxymethylethyl acrylamide therein as needed.

[0063] Examples of rubber-based adhesives include those obtained by mixing one or more elastomer components such as natural rubber, styrene-butadiene rubber, butyl rubber, isoprene rubber, butadiene rubber, and styrene-isoprene block copolymers, or by mixing rosin-based resins, terpene-based resins, aliphatic petroleum resins, aromatic petroleum resins, copolymer petroleum resins, alicyclic petroleum resins, coumarone-indene resins, pure monomer resins, phenolic resins, and xylene resins.

[0064] In addition to the adhesive base polymer, the adhesive layer 6 may contain various additives known in the art. Such additives may include one or more of the following: crosslinking agents, flame retardants, antioxidants, weathering agents, softeners, stabilizers, fillers, extenders, reinforcing agents, etc.

[0065] The thickness of the adhesive layer 6 can be appropriately set according to the purpose and the components of the adhesive used; for example, it can be formed in the range of 5 to 200 μm. The adhesive layer 6 can be formed by directly coating it onto the first laminate 2 using various coating apparatuses, or it can be formed by coating it after the primer layer 4 has been formed or surface treatment has been performed using various coating apparatuses. Examples of coating apparatuses include, for example, roller coaters, die coaters, lip coaters, Mayer bar coaters, and gravure coaters.

[0066] <Back coating>

[0067] When the tape is wound, various release agents can be applied as backing agent layer 5 to the side surface of the second laminate that is in contact with the adhesive layer 6. Examples of release agents include long-chain alkyl release agents (copolymers of stearyl acrylate with acrylic acid, vinyl acetate or acrylonitrile, copolymers of stearyl acrylamide with acrylonitrile and acrylic acid, copolymers of stearyl vinyl ether with acrylic acid, maleic anhydride and acrylonitrile), addition reaction type, condensation reaction type, cationic polymerization type, free radical polymerization type polysiloxane release agents, etc.

[0068] These release agents can also be applied using the various coating devices described above.

[0069] Example

[0070] The present invention will be described in more detail below through embodiments, but the present invention is not limited to these embodiments in any way.

[0071] (Example 1)

[0072] The warp yarn is made of 30 denier polyester multifilament (density of 24 threads / inch), and the weft yarn is made of 300 denier high-density polyethylene flat yarn (density of 17 threads / inch), knitted to form... Figure 1 (b) shows warp yarns forming an independent chain stitch structure in warp-knitted fabric, which is used as a base fabric.

[0073] Next, a polyethylene resin laminate is formed on both the surface and back of the base fabric. First, the first side 1A of the base fabric (the side where one warp yarn 11 is exposed on the surface of the weft yarn 12) laid between two rubber rollers is corona treated. Then, polyethylene resin is melt-extruded from a T-die and pressed through the rubber rollers onto the matte roller 27 to form a first laminate 2 with a matte surface 2A. Next, the surface is flipped over, and the second side 1B is also corona treated. Then, using the same method as the first side, polyethylene resin is melt-extruded from a T-die and pressed through the rubber rollers onto the mirror roller 28 to form a second laminate 3 with a smooth surface 3A. On the first laminate 2, an uneven surface 2B reflecting the unevenness based on the warp and weft yarns is formed. The thickness of the first laminate is 37 μm, and the thickness of the second laminate is 40 μm. In the unevenness formed on the surface of the first laminate, the average depth of the recesses from the matte roller is 3.0 μm, and the average depth of the recesses from the warp and weft yarns is 12.4 μm (both are arithmetic mean after measuring 10 points. The measurements were taken using a white light interference microscope). Next, using a roller coater, an acrylic adhesive is applied to the uneven surface 2B of the first laminate 2 to form an adhesive layer 6 with a thickness of 35 μm, thereby producing the adhesive tape of Example 1.

[0074] (Example 2)

[0075] After corona treatment of the uneven surface 2B of the first laminate 2, an acrylic adhesive is applied using a roller coater to form an adhesive layer 6. Otherwise, the adhesive tape of Example 2 is produced by operating in the same manner as in Example 1.

[0076] (Example 3)

[0077] After corona treatment of the uneven surface 2B of the first laminate 2, an ethylene-vinyl acetate copolymer primer layer 4 is formed on the corona-treated surface. Then, an acrylic adhesive is applied using a roller coater to form an adhesive layer 6. Otherwise, the adhesive tape of Example 3 is produced by operating in the same manner as in Example 1.

[0078] (Example 4)

[0079] The warp yarns are made of 30 denier polyester multifilament (78 threads / inch), and the weft yarns are made of 100 denier polyester multifilament (18 threads / inch). The weave is formed as follows: Figure 1(a) A plain weave fabric as shown is used as the base fabric. Otherwise, the adhesive tape of Example 4 is produced in the same manner as in Example 3. In the unevenness formed on the surface of the first laminate, the average depth of the recesses from the matte roller is 1.9 μm, and the average depth of the recesses from the warp and weft yarns is 13.5 μm (both are arithmetic mean values ​​after measuring 10 points. Measurements were taken using a white light interference microscope).

[0080] (Comparative Example 1)

[0081] An acrylic adhesive was applied to the smooth surface 3A side of the second laminate 3 in Example 1 to form an adhesive layer. No acrylic adhesive was applied to the first laminate side. Otherwise, the adhesive tape of Comparative Example 1 was made in the same manner as in Example 1.

[0082] (Comparative Example 2)

[0083] An acrylic adhesive was applied to the smooth surface 3A side of the second laminate 3 in Example 4 to form an adhesive layer. No acrylic adhesive was applied to the first laminate side. Otherwise, the adhesive tape of Comparative Example 2 was made in the same manner as in Example 4.

[0084] (Comparative Examples 3-5)

[0085] The order of forming the first and second laminates in Examples 1 to 3 was reversed, and only the surface state of the first laminate was made matte. Otherwise, the same procedure was followed as in Examples 1 to 3 to produce the adhesive tapes of Comparative Examples 3 to 5.

[0086] Evaluation Methods

[0087] <Residual adhesive on the bonded body>

[0088] Adhesive tape, cut to a length of 300 mm in the warp direction and 24 mm in the weft direction, was applied to a test plate (SUS304 steel plate) used in the adhesion strength test of JIS Z 0237 using the method described in JIS Z 0237. The plate was then left to stand for approximately 20 minutes at a temperature of 23±1℃ and a relative humidity of 50±5%. Then, based on the adhesion strength test method of the same standard, the adhesive tape was peeled off from the test plate. The area of ​​adhesive residue (or adhesive residue due to damage to the interface between the laminate and the adhesive layer) was measured, and the proportion of this residue in the peeled adhesive tape area was calculated. Additionally, adhesive residue was also measured for samples prepared in the same manner and left to stand at a temperature of 23±1℃ and a relative humidity of 50±5% for 3 days and 1 week. The results are shown in Tables 1 and 2.

[0089] [Table 1]

[0090]

[0091] [Table 2]

[0092]

[0093] For the adhesive tape of the present invention, adhesive residue can be effectively suppressed by having an uneven surface on the adhesive coating surface that reflects the unevenness of the base fabric surface. In particular, by performing a surface treatment on the first lamination layer of the adhesive coating surface, an adhesive tape with substantially no adhesive residue can be provided.

[0094] Explanation of reference numerals in the attached figures

[0095] 1. Base cloth

[0096] 11 warp yarns

[0097] 12 weft yarns

[0098] 1A First Page

[0099] 1B Second Page

[0100] 2 First layer

[0101] 2A Matte finish

[0102] 2B Concave-convex surface

[0103] 3 Second layer

[0104] 3A Smooth Surface

[0105] 4. Primer layer

[0106] 5. Backing Coating

[0107] 6 Adhesive layer

[0108] 10 Substrate

[0109] 20 Extrusion Laminator

[0110] 21 Extruder

[0111] 22 T-shaped mold

[0112] 23 Corona Treatment Device

[0113] 24 Resin Materials

[0114] 25 Pressure rollers (rubber-made)

[0115] 26 Cooling rollers

[0116] 27 Matting Roller

[0117] 28 smoothing rollers

Claims

1. An adhesive tape comprising: The substrate has a base fabric composed of warp and weft yarns, a first laminate formed on a first surface of the base fabric, and a second laminate formed on a second surface of the base fabric. An adhesive layer is formed as the outermost layer on the side of the substrate where the first laminate has been formed. The first laminate is formed on the base fabric where one warp yarn is exposed on the surface of the weft yarn. The second laminate is formed on the base fabric where the second side of the two warp yarns is exposed on the surface of the weft yarn. On the side of the first laminate opposite to the base fabric, there are irregularities formed by the warp and weft yarns, as well as irregularities formed by the matting roller. The average depth of the recesses created by the warp and weft yarns is 10 μm or more and 20 μm or less. The average depth of the recesses created by the matte roller is greater than 1 μm and less than 10 μm. The average depth is the arithmetic mean of the values ​​measured at 10 points using a white light interference microscope.

2. The adhesive tape according to claim 1, wherein, The side of the second laminate opposite to the base fabric is a smooth surface.

3. The adhesive tape according to claim 1 or 2, wherein, A primer layer is formed between the first laminate and the adhesive layer.

4. The adhesive tape according to claim 3, wherein, The surface of the first laminate is subjected to corona treatment, and the primer layer is formed on the corona-treated surface.

5. The adhesive tape according to claim 1 or 2, wherein, The first and second sides of the base fabric are corona-treated surfaces.

6. The adhesive tape according to claim 1 or 2, wherein, A backing agent layer, which is a release agent layer, is provided on the side of the second laminate opposite to the base fabric.

7. The adhesive tape according to claim 1 or 2, wherein, The warp yarn is multifilament. The weft yarn is a flat yarn.

8. The adhesive tape according to claim 1 or 2, wherein, The warp yarn is a polyester multifilament.

9. The adhesive tape according to claim 1 or 2, wherein, The first laminate and the second laminate contain a thermoplastic resin comprising polyethylene.

10. The adhesive tape according to claim 9, wherein, The weft yarn is a flat yarn made of polyethylene.

11. The adhesive tape according to claim 1 or 2, wherein, The base fabric is a warp-knitted fabric formed by inserting the weft yarn into a loop structure formed by the warp yarn.

12. The adhesive tape according to claim 11, wherein, The coil structure is an independent chain-like thread.

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