Rubber Strips and Rollers

Abstract

To provide a rubber strip which prevents early detachment, can be wound to a roller material in a long term stably, and is also excellent in working properties in replacement, and a roller to which the rubber strip is applied.SOLUTION: A rubber strip 10 is applied to a roller transporting a transport object, is wound to a peripheral face of a columnar roller substrate of the roller spirally without a gap, and is formed of a plurality of layers, the rubber strip comprises: a surface layer 11 contacting the transport object, and including an elastic layer 11a formed of a rubber composition including a plasticizer; an adhesive layer 14 adhered to the peripheral face of the roller substrate; a resin film layer 13 provided between the surface layer 11 and the adhesive layer 14; and an adhesive agent layer 12 which is formed of a thermosetting resin based adhesive agent for adhering the surface layer 11 and the resin film layer 13.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a rubber strip and a roller having a rubber strip applied thereto. [Background technology]

[0002] For example, a loom is provided with a surface roller and a press roller as loom rollers for transporting the woven fabric. These rollers rotate in cooperation to transport and wind the woven fabric. A rubber strip is wound around the outer peripheral surface of the base material of these rollers, and contact with the woven fabric via the rubber strip provides the roller with an appropriate grip force, thereby preventing the woven fabric from slipping (see Patent Document 1 and Patent Document 2). Rubber strips are also used in devices other than looms, such as a woven fabric winding device, and are wound around rollers that transport the transported material in the device.

[0003] Conventionally, a method for winding a rubber strip is known in which, for example, the surface of the roller base material is cured with an organic solvent, a rubber-based adhesive such as a nitrile-based or chloroprene-based adhesive is applied to the surface, and the rubber strip is then adhered in a spiral shape (helical shape) on top of the adhesive. In this case, the rubber strip is fixed with nails at both ends of the roller.

[0004] However, in the above-mentioned adhesion method, it is considered that the initial adhesive strength between the roller base material and the rubber strip is not stable due to uneven application of the adhesive. In addition, in a hot and humid environment such as overseas, there is a concern that the adhesive may change in quality and the rubber strip may peel off early. Furthermore, the adhesive contains organic solvents such as toluene and methyl ethyl ketone, and there is a concern about the impact on the human body of the worker and the surrounding area. In addition, the rubber strip is replaced periodically (for example, every 1.5 years) because the surface that comes into contact with the transported goods gradually wears away. When the rubber strip is adhered using an adhesive as in the past, the adhesive remains on the roller base material when the rubber strip is removed, so it is necessary to clean the outer circumferential surface of the roller base material. Therefore, it is considered that there is room for improvement in the above-mentioned adhesion method from the viewpoint of workability when attaching and removing the rubber strip.

[0005] On the other hand, methods for wrapping a rubber strip without applying an adhesive include, for example, (1) a method in which an acrylic adhesive is transferred to the back side of the rubber strip by a transfer method and then attached to the roller base material, and (2) a method in which a double-sided tape using an acrylic adhesive is attached to the surface of the roller base material, and then the rubber strip is attached. In the adhesion method (2), nonwoven fabric or polyethylene terephthalate is used as the base material for the double-sided tape. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 33-189 [Patent Document 2] Japanese Unexamined Patent Publication No. 43-30132 Summary of the Invention [Problem to be solved by the invention]

[0007] However, in the above adhesion method (1), the plasticizer mixed in the rubber may migrate to the adhesive, causing a decrease in adhesive strength. As a result, there is a concern that early peeling may occur between the adhesive and the rubber strip. In addition, there is a concern that the migration of the plasticizer to the adhesive layer may reduce the adhesive's adhesive residual property, which may require wiping off when replacing the adhesive, resulting in a decrease in workability.

[0008] In addition, even with the above adhesion method (2), there is a risk that the plasticizer contained in the rubber will migrate to the adhesive layer, reducing the adhesive strength, which may result in early separation between the double-sided tape and the rubber strip.

[0009] The present invention has been made to address such problems, and has an object to provide a rubber strip that prevents early peeling, can be wound around a roller base material stably for a long period of time, and is easy to replace, as well as a roller to which this rubber strip is applied. [Means for solving the problem]

[0010] The rubber strip of the present invention is applied to a roller for conveying an object to be conveyed, and is a rubber strip consisting of a plurality of layers, wound spirally around the outer peripheral surface of the cylindrical roller base material of the roller without gaps, and is characterized by having a surface layer that contacts the object to be conveyed and includes an elastic layer made of a rubber composition containing a plasticizer, an adhesive layer that adheres to the outer peripheral surface of the roller base material, a resin film layer provided between the surface layer and the adhesive layer, and an adhesive layer made of a thermosetting resin adhesive that adheres the surface layer and the resin film layer. The rubber strip of the present invention is generally used as a roll covering.

[0011] The surface layer is characterized by having a reinforcing layer interposed between the elastic layer and the adhesive layer.

[0012] The resin film layer has a thickness of 15 μm to 50 μm, and is thinner than the adhesive layer.

[0013] The resin film layer is made of a polyethylene terephthalate (PET) film, and the thermosetting resin adhesive is a polyurethane adhesive.

[0014] The transported object is a woven fabric, and the roller is a roller used in a loom.

[0015] The roller of the present invention is a roller for transporting an object to be transported, comprising a cylindrical roller base material and a rubber strip consisting of a plurality of layers and wound tightly in a spiral shape around the outer peripheral surface of the roller base material, the rubber strip being characterized in that it has a surface layer which comes into contact with the object to be transported and which includes an elastic layer made of a rubber composition containing a plasticizer, an adhesive layer which adheres to the outer peripheral surface of the roller base material, a resin film layer which is provided between the surface layer and the adhesive layer, and an adhesive layer which is made of a thermosetting resin-based adhesive which bonds the surface layer to the resin film layer. Effect of the Invention

[0016] The rubber strip of the present invention can prevent the plasticizer from migrating from the elastic layer to the adhesive layer by providing a resin film layer between the surface layer including the elastic layer and the adhesive layer. In addition, by interposing the resin film layer between the layers, dimensional changes due to shrinkage after the rubber strip is wound around the roller base material can be prevented. Furthermore, by adhering the resin film layer to the surface layer with a thermosetting resin adhesive, the surface layer can be prevented from peeling off from the resin film layer even in a high temperature environment. This prevents the adhesive strength of the adhesive layer from decreasing and interlayer peeling, and the rubber strip can be stably wound for a long period of time. In addition, by preventing the migration of the plasticizer with the resin film layer, the occurrence of glue residue can also be prevented, which contributes to improving workability.

[0017] In addition, since the surface layer has a reinforcing layer, the surface layer that comes into contact with the transported object can be reinforced. Furthermore, by interposing the reinforcing layer between the elastic layer and the adhesive layer, the influence of the plasticizer contained in the elastic layer on the adhesive layer can be reduced, and the adhesive strength of the adhesive layer can be easily maintained.

[0018] The resin film layer has a thickness of 15 μm to 50 μm, which is thinner than the adhesive layer, so that migration of the plasticizer can be prevented while ensuring ease of wrapping of the rubber strip.

[0019] Since the resin film layer is made of a PET film and the thermosetting resin adhesive is a polyurethane adhesive, the surface layer can be prevented from peeling off from the resin film layer even in a hot and humid environment that tends to cause deterioration of the adhesive.

[0020] The roller of the present invention comprises a cylindrical roller base material and a rubber strip of the present invention, which is made of multiple layers and wound tightly in a spiral shape around the outer circumferential surface of the roller base material, so that the rubber strip can be stably wound around the roller for a long period of time. In addition, the roller does not leave any adhesive residue on the rubber strip, so that the workability when replacing the rubber strip is excellent. [Brief description of the drawings]

[0021] [Figure 1] 1 is a schematic diagram of a loom to which a roller of the present invention is applied; [Diagram 2] FIG. 2 is a cross-sectional view of the rubber strip of the present invention. [Diagram 3] FIG. 13 is a diagram showing a manner in which a rubber strip is wrapped. [Figure 4] 1 is a cross section of the rubber strips of Comparative Example 1 and Comparative Example 2. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] Fig. 1 shows a schematic diagram of a loom equipped with a loom roller as a roller of the present invention. The loom 6 includes a weaving device 1 that weaves warp and weft threads to weave woven fabric A, a pair of press rollers 2 and 3, a surface roller 4 that cooperates with the pair of press rollers to transport the woven fabric, and a take-up roller 5. A drive motor (not shown) is connected to the surface roller 4 to rotate the surface roller 4 in the direction of the arrow.

[0023] The press rollers 2 and 3 are pressed against the circumferential surface of the surface roller 4 via the woven fabric A, and the press rollers 2 and 3 rotate in accordance with the rotation of the surface roller 4. In this case, as the surface roller 4 rotates in the direction of the arrow, the woven fabric A sent out from the weaving device 1 is wound around the press roller 2, the surface roller 4, and the press roller 3 in that order and is sandwiched between these rollers, and is sent out to the take-up roller 5. The take-up roller 5 takes up the woven fabric.

[0024] The press rollers 2 and 3 each have a roller base material 2a and 3a made of a metal member, and a rubber strip 10 of the present invention attached to the outer circumferential surface of each roller base material 2a and 3a. Similarly, the surface roller 4 also has a roller base material 4a made of a metal member, and a rubber strip 10 of the present invention attached to the outer circumferential surface of the roller base material 4a.

[0025] The metal members of the roller substrates 2a, 3a, and 4a are, for example, general steel materials such as carbon steel pipes for mechanical construction (so-called STKM materials). The roller substrates 2a, 3a, and 4a may be made of resin materials. Each of the roller substrates 2a, 3a, and 4a is wrapped with a rubber strip 10, which improves the gripping force (holding ability) of each of the rollers 2, 3, and 4 and prevents the woven fabric A from slipping during conveyance. In this case, the rubber strip 10 functions as an anti-slip member.

[0026] FIG. 2 shows a cross-sectional view of a rubber strip 10. The rubber strip 10 is a laminate having a surface layer 11 that contacts the woven fabric, an adhesive layer 14 that adheres to the outer peripheral surface of the roller base material, a resin film layer 13 provided between the surface layer 11 and the adhesive layer 14, an adhesive layer 12 that bonds the surface layer 11 and the resin film layer 13, and a release layer 15. In the rubber strip 10 of FIG. 2, the surface layer 11 has an elastic layer 11a and a reinforcing layer 11b. The surface of the elastic layer 11a that contacts the woven fabric may be formed with rough unevenness. This makes it possible to impart an appropriate grip force to the roller without damaging the woven fabric.

[0027] In the rubber strip 10, a release layer 15 is attached to the adhesive surface 14a of the adhesive layer 14. When using the rubber strip 10, the release layer 15 is peeled off to expose the adhesive surface 14a, which is then attached to a roller substrate. When the rubber strip 10 is attached to the roller substrate, the layers are, in order from the outer peripheral surface side, the elastic layer 11a, the reinforcing layer 11b, the adhesive layer 12, the resin film layer 13, the adhesive layer 14, and the roller substrate.

[0028] Here, the adhesive used in the adhesive layer 14 may be a known adhesive having adhesive properties. For example, an acrylic adhesive, a natural rubber adhesive, a synthetic rubber adhesive, a silicone adhesive, etc. may be used as the adhesive. In terms of versatility, cost, adhesive residue, etc., it is preferable to use an acrylic adhesive. The thickness of the adhesive layer 14 is, for example, 10 μm to 300 μm, and preferably 10 μm to 100 μm. Since the rubber strip of the present invention is attached to the roller base material via the adhesive layer, it can be attached without applying an adhesive to the roller base material, which simplifies the attachment and detachment work compared to such an adhesion method, and also leads to stabilization of adhesion. However, when an adhesive layer is used, the plasticizer contained in the rubber composition may migrate to the adhesive layer, causing the adhesive to deteriorate and reducing the adhesive strength.

[0029] Therefore, in the rubber strip 10 of Fig. 2, a resin film layer 13 is interposed as a plasticizer migration prevention layer between the elastic layer 11a made of a rubber composition containing a plasticizer and the adhesive layer 14. This prevents the plasticizer from migrating to the adhesive layer 14, allowing the adhesive force to be exerted stably for a long period of time. In addition, by providing a resin film with high dimensional stability, dimensional changes due to shrinkage after wrapping around the roller base material can be prevented.

[0030] The resin film used for the resin film layer 13 is not particularly limited, and examples thereof include a PET film, a polyethylene naphthalate film, a polybutylene terephthalate film, a polycarbonate film, a polypropylene film, etc. A PET film is preferable because it has excellent dimensional stability and can exhibit excellent adhesion to the adhesive layer 12 and the pressure-sensitive adhesive layer 14 provided adjacently.

[0031] The thickness of the resin film layer 13 is not particularly limited, and is set to, for example, 9 μm to 100 μm. The thicker the thickness, the higher the rigidity of the film, which may make it difficult to wind the rubber strip. On the other hand, the thinner the thickness, the lower the effect of preventing dimensional changes due to shrinkage after winding. In consideration of these, the thickness of the resin film layer 13 is preferably 15 μm to 75 μm, and more preferably 15 μm to 50 μm. From another perspective, the thickness of the resin film layer 13 is preferably formed to be thinner than the thickness of the adhesive layer 12.

[0032] In Fig. 2, the elastic layer 11a of the surface layer 11 is formed by crosslinking a rubber composition containing a plasticizer. The rubber component may be natural rubber, butadiene rubber, styrene butadiene rubber, isoprene rubber, butyl rubber, acrylonitrile butadiene rubber (nitrile rubber), ethylene propylene rubber, chloroprene rubber, acrylic rubber, silicone rubber, fluororubber, urethane rubber, or the like. The plasticizer is not particularly limited, and an ester-based plasticizer, or the like, may be used.

[0033] The rubber hardness of the elastic layer 11a is, for example, 40 degrees to 90 degrees. The rubber hardness is a value measured in accordance with JIS K6253-3 Type A Durometer A. This rubber hardness is obtained by crosslinking the rubber composition using a known crosslinking method. As the crosslinking method, for example, a method of irradiating the rubber composition with active rays such as ultraviolet rays, gamma rays, and electron beams may be used, or a method of blending the rubber composition with a crosslinking agent such as peroxide or a catalyst such as platinum and then subjecting the rubber composition to a heat treatment may be used.

[0034] The reinforcing layer 11b of the surface layer 11 is interposed between the elastic layer 11a and the adhesive layer 12, and is made of cotton cloth, nonwoven cloth, or the like. For example, synthetic fibers such as nylon fibers are used as the nonwoven cloth. The reinforcing layer 11b can reinforce the surface layer 11 that comes into contact with the woven cloth. Furthermore, by providing the reinforcing layer 11b between the elastic layer 11a and the adhesive layer 12, it is possible to suppress the plasticizer contained in the elastic layer 11a from migrating to the adhesive layer 12, and it is considered that the adverse effects associated with the migration can be reduced. The thickness of the reinforcing layer 11b is, for example, 100 μm to 500 μm.

[0035] The configuration of the surface layer 11 is not limited to the configuration shown in Fig. 2. For example, the reinforcing layer 11b may be omitted from the surface layer 11, or another intermediate layer may be provided in place of the reinforcing layer 11b.

[0036] The adhesive layer 12 is a layer that bonds the surface layer 11 and the resin film layer 13, and is formed by coating a thermosetting resin adhesive. As shown in the examples, by using a thermosetting resin adhesive as the adhesive, the adhesive strength can be maintained even in a high temperature and high humidity environment compared to the case of using a thermoplastic resin adhesive, and interlayer peeling can be prevented. As the thermosetting resin adhesive, a known adhesive can be used, such as a polyurethane adhesive, a polyester adhesive, or an epoxy resin adhesive. In addition, as the solvent-type adhesive, a one-component curing type or two-component curing type adhesive can be used.

[0037] As the thermosetting resin adhesive, a polyurethane adhesive having excellent heat resistance and water resistance and flexibility is preferable, and a two-component curing polyurethane adhesive is more preferable. The two-component curing polyurethane adhesive is composed of a polyol component as a main agent and an isocyanate component as a curing agent. Examples of the polyol component include polyurethane polyol, polyester polyol, polycarbonate polyol, polyether polyol, acrylic polyol, and polyolefin polyol. Examples of the isocyanate component include aliphatic polyisocyanate, aromatic polyisocyanate, araliphatic polyisocyanate, and alicyclic polyisocyanate. The thickness of the adhesive layer 12 is not particularly limited, but is preferably 10 μm to 100 μm, and more preferably 30 μm to 100 μm.

[0038] For the release layer 15, resin films such as PET film, polyethylene naphthalate film, polybutylene terephthalate film, polycarbonate film, polypropylene film, and release paper can be used. Among these, it is preferable to use a resin film, and it is more preferable to use a resin film of the same material as the resin film 13. The resin film of the same material means that at least the type of resin (PET, polyethylene naphthalate, polybutylene terephthalate, polycarbonate, polypropylene, etc.) is the same. For example, it is preferable to use a PET film for the resin film layer 13 and a PET film for the release layer 15. In this case, it is more preferable that the thicknesses of the resin films are approximately the same. In addition, a release treatment is performed on the contact surface of the release layer 15 with the adhesive layer 14.

[0039] The total thickness of the rubber strip 10 is appropriately set depending on the application. The total thickness is, for example, 0.5 mm to 5.0 mm. In the layer structure of the rubber strip 10, it is preferable that the elastic layer 11a is formed to have the thickest thickness. Specifically, the thickness of the elastic layer 11a is 50% or more, and preferably 60% or more, of the total thickness of the rubber strip 10. On the other hand, in the layer structure excluding the release layer 15, it is preferable that the resin film layer 13 is formed to have the thinnest thickness. This makes it easier to make the bending rigidity of the entire rubber strip 10 appropriate, and improves the workability of attaching the rubber strip 10.

[0040] The rubber strip of the present invention can be obtained, for example, by preparing a surface layer unit including a surface layer, and a unit (film tape) including a resin film, an adhesive layer, and a release layer, and laminating them together under heating using a thermosetting resin adhesive. The surface layer unit can be obtained by kneading a rubber composition containing a plasticizer, sheeting it, and, if necessary, laminating a cotton cloth or the like, and then crosslinking it. On the other hand, the film tape can be obtained by applying an adhesive to one side of a resin film and laminating a release layer.

[0041] FIG. 3 shows a state in which the rubber strip 10 is wound around the cylindrical base material 4a of the surface roller 4, for example. As shown in FIG. 3, the rubber strip 10 has an endless long shape. After a predetermined length of the release layer of the rubber strip 10 is peeled off, the rubber strip 10 is mechanically fixed to one end in the width direction (axial direction) of the base material 4a by a nail or the like. Then, while applying tension from one end to the other end, the rubber strip 10 is wound around the base material 4a in a spiral shape so that the elastic layer 11a becomes the outer peripheral surface. At this time, the rubber strip 10 is wound without gaps and without overlapping each other, and both ends of the rubber strip 10 in the width direction are in contact with each other. After that, when the rubber strip 10 reaches the other end, it is fixed using a nail or the like.

[0042] The rubber strip 10 of the present invention has the above-mentioned resin film layer provided between the layers, which makes it possible to prevent dimensional changes due to shrinkage, etc., after the rubber strip 10 is wound around the roller base material. This makes it difficult for gaps to form between the wound rubber strips, and makes it possible to stably maintain the wound state.

[0043] The configuration of the loom roller and the loom to which the rubber strip of the present invention is applied is not limited to the configuration shown in the drawings, and may be modified as appropriate. For example, the rubber strip 10 may be applied only to the base material 4a of the surface roller 4, or the rubber strip 10 may be applied only to the base materials 2a, 3a of the press rollers 2, 3.

[0044] As shown in the examples, the rubber strip of the present invention can maintain excellent adhesive strength even in a hot and humid environment and can prevent delamination, so it can be suitably used for rollers used in hot and humid environments. For example, it can be used for loom rollers used in water jet looms and air jet looms. A water jet loom is a loom that inserts a weft thread by spraying water compressed by a pump from a nozzle together with the weft thread, and an air jet loom is a loom that inserts a weft thread by spraying compressed air from a nozzle together with the weft thread.

[0045] In addition, the roller to which the rubber strip of the present invention is applied is not particularly limited as long as it is a roller for transporting an object, and can be applied to devices other than weaving machines. For example, it can be applied to rollers in devices such as woven fabric winding devices, woven fabric inspection machines, fishing net machines, knitting machine winding devices, fabric dyeing machines, fabric dryers, film slitters, and cardboard production machines. It is expected that the rubber strip of the present invention can be applied to printing rollers, steelmaking rollers, film transport line rollers, and the like. EXAMPLES

[0046] Example 1 A nitrile rubber composition containing an ester-based plasticizer was weighed as the elastic layer, and kneaded with two metal rolls. The kneaded nitrile rubber composition was sheeted to a specified size so as to have a thickness of 0.80 mm, and was attached to one side of the cotton cloth as the reinforcing layer. Then, the basis weight was transferred to the elastic layer using sandpaper, and the sheet was pressed with a pressure of 5 kg / cm. 2 The resulting mixture was heated at 170°C for 4.5 minutes to crosslink the surface layer unit, in which the elastic layer was a crosslinked product of the nitrile rubber composition. The rubber hardness of the elastic layer was 70 degrees. Next, an acrylic adhesive was applied to one side of a 38 μm thick PET film so that the thickness after drying was 50 μm, and a 38 μm thick release PET film was attached to obtain a film tape. Then, a two-liquid curing urethane adhesive was applied to the other side of the PET film of the film tape so that the thickness after drying was 60 μm, and the two rolls were thermally laminated at 100° with the cotton cloth side of the surface layer unit to obtain the rubber strip shown in FIG. 2.

[0047] Comparative Example 1 A nitrile rubber composition containing an ester-based plasticizer was weighed as the elastic layer, and kneaded with two metal rolls. The kneaded nitrile rubber composition was sheeted to a specified size so as to have a thickness of 0.80 mm, and was attached to one side of the cotton cloth as the reinforcing layer. Then, the basis weight was transferred to the elastic layer using sandpaper, and the sheet was pressed with a pressure of 5 kg / cm. 2 The rubber strip was then heated at 170°C for 4.5 minutes to crosslink the rubber, obtaining a surface layer unit in which the elastic layer was a crosslinked product of the nitrile rubber composition. The rubber hardness of the elastic layer was 70 degrees. Next, an acrylic adhesive was applied to a release paper so that the thickness after drying was 50 μm, and transferred to the cotton cloth side of the surface layer unit to obtain a rubber strip as shown in FIG. 4(a). In this rubber strip, an elastic layer 21, a reinforcing layer 22, an adhesive layer 23, and a release layer 24 are arranged in this order from the outer surface.

[0048] Comparative Example 2 Styrene-butadiene latex was applied to a polyethylene laminate cloth so that the thickness after drying would be 50μm. A nitrile rubber composition containing an ester-based plasticizer was weighed out for the elastic layer, and kneaded with two metal rolls. The kneaded nitrile rubber composition was sheeted to a specified dimension so that the thickness was 0.80mm, and then bonded to the surface of the styrene-butadiene latex. The mesh was then transferred to the elastic layer using sandpaper, and the layer was pressed with a pressure of 5kg / cm. 2 The rubber strip was then heated at 170°C for 4.5 minutes to crosslink the rubber, forming a crosslinked elastic layer of the nitrile rubber composition. The rubber hardness of the elastic layer was 70 degrees. The acrylic adhesive was then applied to a release paper so that the thickness after drying was 50 μm, and the coating was transferred to the polyethylene laminate cloth side to obtain a rubber strip as shown in FIG. 4(b). In this rubber strip, an elastic layer 31, a latex layer 32, a laminate cloth layer 33, an adhesive layer 34, and a release layer 35 are arranged in this order from the outer surface.

[0049] Comparative Example 3 A nitrile rubber composition containing an ester-based plasticizer was weighed as the elastic layer, and kneaded with two metal rolls. The kneaded nitrile rubber composition was sheeted to a specified size so as to have a thickness of 0.80 mm, and was attached to one side of the cotton cloth as the reinforcing layer. Then, the basis weight was transferred to the elastic layer using sandpaper, and the sheet was pressed with a pressure of 5 kg / cm. 2 , and heated at 170 ° C for 4.5 minutes to crosslink, obtaining a surface layer unit in which the elastic layer is a crosslinked body of the nitrile rubber composition. The rubber hardness of the elastic layer was 70 degrees. Next, an acrylic adhesive was applied to one side of a PET film having a thickness of 38 μm so that the thickness after drying was 50 μm, and a release PET film having a thickness of 38 μm was attached to obtain a film tape. Then, a thermoplastic urethane adhesive was applied to the other side of the PET film of the film tape so that the thickness after drying was 60 μm, and the rubber strip was obtained by thermally laminating it with the cotton cloth side of the surface layer unit with two rolls at 160 degrees. In this rubber strip, an elastic layer, a reinforcing layer, an adhesive layer made of a thermoplastic urethane adhesive, a resin film layer, an adhesive layer, and a release layer are arranged in order from the outer surface.

[0050] Comparative Example 4 As a commercially available adhesive-backed rubber strip, a rubber strip (BO-301) manufactured by BOLIM was used.

[0051] Comparative Example 5 As a commercially available adhesive rubber strip, a rubber strip (KMC-41 / R) manufactured by BOBOTEX was used.

[0052] <Peel test (adhesive strength)> The rubber strips obtained above were each cut to a width of 25 mm and a length of 200 mm to prepare test pieces. The adhesive layer of each test piece was attached to a stainless steel plate made of SUS304, and left in an environment of 40°C and 100% humidity, and the adhesive strength and adhesive residue were evaluated after each number of days. The test environment was set to a high temperature and high humidity environment, assuming use in a loom roller used in a water jet loom, for example. The adhesive strength was measured in accordance with JIS Z0237 using a tensile tester, where the end of the test piece was held and folded 180 degrees, and the load at which the test piece peeled off from the stainless steel plate was measured. The adhesive residue was also evaluated by observing the surface of the stainless steel plate after the test piece was peeled off. The results are shown in Table 1.

[0053] [Table 1]

[0054] As shown in Table 1, the adhesive strength of the rubber strip of Example 1 remained almost unchanged from the start of the test until 14 days later, and the adhesive strength could be maintained. Furthermore, no adhesive residue was observed after peeling. On the other hand, Comparative Example 1 had low adhesive strength from the start of the test, and a decrease in adhesive strength and adhesive residue were observed over time. The rubber strip of Comparative Example 1 only had a reinforcing layer (cotton cloth) between the elastic layer and the adhesive layer, and it is considered that the plasticizer contained in the elastic layer migrated to the adhesive layer over time, resulting in a decrease in adhesive strength and adhesive residue. In Comparative Example 2, styrene-butadiene latex and polyethylene laminate cloth were provided as plasticizer migration prevention layers, but the migration of the plasticizer could not be sufficiently prevented, and a decrease in adhesive strength and adhesive residue were observed over time. In Comparative Examples 4 and 5, which have the same layer structure as Comparative Example 1, adhesive strength was low from the start of the test, and adhesive residue was observed. No follow-up observations were made on these.

[0055] In addition, in Table 1, in Comparative Example 3, there was no glue residue and the adhesive strength was numerically good. However, in the rubber strip of Comparative Example 3, delamination occurred between the PET film and the cotton cloth when the adhesive strength was measured, suggesting the possibility that the adhesive strength could not be accurately evaluated. Therefore, the following test was carried out to evaluate the adhesive strength between the PET film and the cotton cloth.

[0056] <Peel test (adhesive strength)> Each test piece was cut to a width of 25 mm and a length of 200 mm and left in an environment with a temperature of 40°C and a humidity of 100%, and the adhesive strength between the PET film and the cotton fabric was evaluated after each period of time. The adhesive strength was measured by a T-peel test in accordance with JIS K6854-3. The results are shown in Table 2.

[0057] [Table 2]

[0058] As shown in Table 2, the adhesive strength between the PET film and the cotton cloth in Example 1 remained almost unchanged from the start of the test until 14 days had passed, and was maintained well. On the other hand, the adhesive strength in Comparative Example 3 was high at the start of the test, but dropped significantly after 7 days. From these results, it can be seen that by using a thermosetting resin adhesive as the adhesive for bonding the PET film and the surface layer, the adhesive strength can be maintained well regardless of the environment, and interlayer peeling can be prevented. Thus, the rubber strip of the present invention can contribute to stable operation without problems such as peeling even in high temperature and humid environments. [Industrial Applicability]

[0059] The rubber strip of the present invention can be wound around a roller base material stably for a long period of time while preventing early peeling, and is also easy to replace, so it can be widely used for rollers that transport objects. In addition, the rubber strip can be wound around the roller base material without applying an adhesive, which contributes to stabilizing winding and improving the environment and workability of workers. [Explanation of symbols]

[0060] 1 Weaving equipment 2 Press roller 3 Press roller 4 Surface roller 5 Winding roller 6. Loom 10 Rubber Strip 11 Surface layer 11a Elastic layer 11b Reinforcement layer 12 Adhesive layer 13 Resin film layer 14 Adhesive layer 15 Release layer

Claims

1. A rubber strip that is applied to a roller for conveying an object to be conveyed, is wound spirally around the outer peripheral surface of a cylindrical roller base material of the roller without any gaps, and is made up of multiple layers, a surface layer that contacts the material to be conveyed and includes an elastic layer made of a rubber composition containing a plasticizer; an adhesive layer that adheres to the outer circumferential surface of the roller base material; a resin film layer that is provided between the surface layer and the adhesive layer; and an adhesive layer that is made of a thermosetting resin adhesive that bonds the surface layer and the resin film layer, the resin film layer is made of a polyethylene terephthalate film, and the thermosetting resin adhesive is a polyurethane adhesive; The rubber composition containing the plasticizer is a nitrile rubber composition containing an ester-based plasticizer. A rubber strip characterized by:

2. 2. The rubber strip according to claim 1, wherein the surface layer has a reinforcing layer interposed between the elastic layer and the adhesive layer.

3. The rubber strip according to claim 1 or 2, characterized in that the resin film layer has a thickness of 15 μm to 50 μm and is thinner than the adhesive layer.

4. 4. The rubber strip according to claim 1, wherein the transported material is a woven fabric, and the roller is a roller used in a loom.

5. A roller for conveying an object, the roller base material is cylindrical; and a rubber strip consisting of a plurality of layers, wound tightly in a spiral shape around the outer circumferential surface of the roller base material, the rubber strip having a surface layer that comes into contact with the material to be conveyed and that includes an elastic layer made of a rubber composition containing a plasticizer, an adhesive layer that adheres to the outer circumferential surface of the roller base material, a resin film layer that is provided between the surface layer and the adhesive layer, and an adhesive layer that is made of a thermosetting resin adhesive that bonds the surface layer and the resin film layer; the resin film layer is made of a polyethylene terephthalate film, and the thermosetting resin adhesive is a polyurethane adhesive; The rubber composition containing the plasticizer is a nitrile rubber composition containing an ester-based plasticizer. A roller characterized by:

Images