JP7650647B2 - Rubber Strips and Rollers - Google Patents

Description

This invention relates to a rubber strip and a roller to which the rubber strip is applied.

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 wrapped around the outer periphery 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, 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 woven fabric winding devices, where they are wrapped around rollers that transport the transported material.

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

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 hot and humid environments 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 are concerns about the impact on the workers' bodies 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 the outer peripheral surface of the roller base material needs to be cleaned. Therefore, it is considered that there is room for improvement in terms of workability when attaching and removing the rubber strip in the above-mentioned adhesion method.

On the other hand, methods for wrapping a rubber strip without applying an adhesive include, for example, (1) transferring an acrylic adhesive to the backside of the rubber strip using a transfer method and attaching it to the roller base material, and (2) attaching a double-sided tape using an acrylic adhesive to the surface of the roller base material, and then attaching the rubber strip. In the adhesion method (2), nonwoven fabric or polyethylene terephthalate is used as the base material for the double-sided tape.

Japanese Unexamined Patent Publication No. 33-189 Japanese Unexamined Patent Publication No. 43-30132

However, in the above adhesion method (1), there is a risk that the plasticizer contained in the rubber will migrate to the adhesive, reducing the adhesive strength. As a result, there is a concern that early peeling will occur between the adhesive and the rubber strip. In addition, there is a concern that the migration of the plasticizer to the adhesive layer will reduce the adhesive's adhesive residue, making it necessary to wipe off the adhesive when replacing it, reducing workability.

In addition, even with the adhesion method (2) above, there is a risk that the plasticizer contained in the rubber will migrate to the adhesive layer, reducing the adhesive strength. In this case, there is a concern that early separation will occur between the double-sided tape and the rubber strip.

The present invention was made to address these problems, and aims to provide a rubber strip that can be wound around a roller base material stably for a long period of time while preventing early peeling, and that is easy to replace, as well as a roller to which this rubber strip is applied.

The rubber strip of the present invention is applied to a roller for transporting an object to be transported, and is a rubber strip consisting of multiple layers that is wound spirally around the outer circumferential 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 transported 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 provided between the surface layer and the adhesive layer, and an adhesive layer made of a thermosetting resin adhesive that bonds the surface layer and the resin film layer. The rubber strip of the present invention is generally used as a roll covering.

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

The resin film layer is 15 μm to 50 μm thick and is thinner than the adhesive layer.

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

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

The roller of the present invention is a roller for transporting an object, and includes a cylindrical roller base material and a rubber strip consisting of multiple layers, wound tightly in a spiral shape on the outer circumferential surface of the roller base material. The rubber strip is characterized by having a surface layer that contacts the object 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 provided between the surface layer and the adhesive layer, and an adhesive layer made of a thermosetting resin adhesive that bonds the surface layer and the resin film layer.

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 a resin film layer between the layers, dimensional changes due to shrinkage after the rubber strip is wrapped 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 high temperature environments. This prevents a decrease in the adhesive strength of the adhesive layer and interlayer peeling, and allows the rubber strip to be stably wrapped 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 improved workability.

In addition, the surface layer has a reinforcing layer, which reinforces the surface layer that comes into contact with the transported object. Furthermore, by having the reinforcing layer between the elastic layer and the adhesive layer, the effect of the plasticizer contained in the elastic layer on the adhesive layer can be reduced, making it easier to maintain the adhesive strength of the adhesive layer.

The resin film layer is 15 μm to 50 μm thick, which is thinner than the adhesive layer, preventing migration of the plasticizer while ensuring the ease of wrapping the rubber strip.

The resin film layer is made of PET film, and the thermosetting resin adhesive is a polyurethane adhesive, so the surface layer can be prevented from peeling off from the resin film layer even in high temperature and humidity environments that tend to cause the adhesive to deteriorate.

The roller of the present invention comprises a cylindrical roller base material and the rubber strip of the present invention, which is made up 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 glue residue on the rubber strip, making it easy to replace the rubber strip.

1 is a schematic diagram of a loom to which a roller of the present invention is applied; FIG. 2 is a cross-sectional view of the rubber strip of the present invention. FIG. 13 is a diagram showing a manner in which a rubber strip is wrapped. 1 is a cross section of a rubber strip of Comparative Example 1 and Comparative Example 2.

Figure 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, which rotates the surface roller 4 in the direction of the arrow.

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 conjunction 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.

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.

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). Note that resin members may also be used for the roller substrates 2a, 3a, and 4a. A rubber strip 10 is wrapped around each of the roller substrates 2a, 3a, and 4a, 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 transport. In this case, the rubber strip 10 functions as an anti-slip member.

Figure 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 Figure 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 irregularities. This makes it possible to impart an appropriate grip force to the roller without damaging the woven fabric.

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 the 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.

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, or a silicone adhesive may be used as the adhesive. In terms of versatility, cost, and adhesive residue, 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. The rubber strip of the present invention is attached to the roller base material via the adhesive layer, so it can be attached without applying an adhesive to the roller base material. Compared to such an adhesion method, the attachment and detachment work is simplified 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.

In the rubber strip 10 shown in FIG. 2, a resin film layer 13 is interposed between the elastic layer 11a, which is made of a rubber composition containing a plasticizer, and the adhesive layer 14 as a plasticizer migration prevention layer. This prevents the plasticizer from migrating to the adhesive layer 14, allowing the adhesive strength to be stable 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.

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, and a polypropylene film. A PET film is preferred because it has excellent dimensional stability and can exhibit excellent adhesion to the adhesive layer 12 and the pressure-sensitive adhesive layer 14 that are provided adjacent to it.

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. Taking these factors into consideration, 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, it is preferable that the thickness of the resin film layer 13 is formed thinner than the thickness of the adhesive layer 12.

In FIG. 2, the elastic layer 11a of the surface layer 11 is formed by crosslinking a rubber composition containing a plasticizer. Examples of the rubber component that can be used include 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, and urethane rubber. The plasticizer is not particularly limited, and an ester-based plasticizer, for example, can be used.

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 well-known crosslinking method. As a 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 heat treating the rubber composition may be used.

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 reinforces the surface layer 11 that comes into contact with the woven cloth. In addition, by providing the reinforcing layer 11b between the elastic layer 11a and the adhesive layer 12, it is possible to prevent the plasticizer contained in the elastic layer 11a from migrating to the adhesive layer 12, and it is believed 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.

The configuration of the surface layer 11 is not limited to that 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.

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, adhesive strength can be maintained even in a high temperature and high humidity environment compared to when a thermoplastic resin adhesive is used, and delamination between layers 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, a one-component curing type or two-component curing type adhesive can be used as a solvent-type adhesive.

As the thermosetting resin adhesive, a polyurethane adhesive having excellent heat resistance, water resistance and flexibility is preferable, and a two-component curing polyurethane adhesive is more preferable. A 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, polyolefin polyol, etc. Examples of the isocyanate component include aliphatic polyisocyanate, aromatic polyisocyanate, araliphatic polyisocyanate, alicyclic polyisocyanate, etc. The thickness of the adhesive layer 12 is not particularly limited, but is preferably 10 μm to 100 μm, more preferably 30 μm to 100 μm.

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. The contact surface of the release layer 15 with the adhesive layer 14 is subjected to a release treatment.

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

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) of a resin film, an adhesive layer, and a release layer, and laminating them together under heat using a thermosetting resin adhesive. The surface layer unit can be obtained by kneading a rubber composition containing a plasticizer, sheeting it, attaching a cotton cloth or the like as necessary, 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.

Figure 3 shows how the rubber strip 10 is wound around the cylindrical substrate 4a of the surface roller 4, for example. As shown in Figure 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 of the substrate 4a in the width direction (axial direction) using a nail or the like. Then, while applying tension from one end to the other end, the rubber strip 10 is wound around the substrate 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.

The rubber strip 10 of the present invention has the above-mentioned resin film layer provided between the layers, which prevents dimensional changes due to shrinkage after the rubber strip 10 is wrapped around the roller base material. This makes it difficult for gaps to form between the wrapped rubber strips, and allows the wrapped state to be stably maintained.

The configuration of the loom roller and loom to which the rubber strip of the present invention is applied is not limited to the configuration shown in the figure, 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.

As shown in the examples, the rubber strip of the present invention can maintain excellent adhesive strength even in hot and humid environments and can also prevent delamination, making it suitable for use in rollers used in hot and humid environments. For example, it can be used in 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.

The rollers to which the rubber strip of the present invention is applied are not particularly limited as long as they are rollers that transport objects, and can be applied to devices other than weaving machines. For example, they 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. Potential applications include printing rollers, steelmaking rollers, and film transport line rollers.

Example 1
A nitrile rubber composition containing an ester-based plasticizer was weighed as an elastic layer, and kneaded with two metal rolls. The kneaded nitrile rubber composition was sheeted to a predetermined size so as to have a thickness of 0.80 mm, and was attached to one side of the cotton cloth as a reinforcing layer. Then, the basis weight was transferred to the elastic layer using sandpaper, and crosslinking was performed by heating at 170°C for 4.5 minutes under a pressure of 5 kg/ ^cm2 , to obtain 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 as to have a thickness of 50 μm after drying, and a release PET film having a thickness of 38 μm was attached to obtain a film tape. Thereafter, a two-component curing urethane adhesive was applied to the other side of the PET film of the film tape so that the thickness after drying would be 60 μm, and the adhesive was thermally laminated to the cotton cloth side of the surface layer unit using two rolls at 100° to obtain the rubber strip shown in FIG. 2.

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 predetermined 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 crosslinking was performed by heating at 170°C for 4.5 minutes under a pressure of 5 kg/ ^cm2 , to obtain 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 a release paper so that the thickness after drying was 50 μm, and the rubber strip shown in FIG. 4(a) was obtained by transferring the acrylic adhesive to the cotton cloth side of the surface layer unit. In this rubber strip, an elastic layer 21, a reinforcing layer 22, an adhesive layer 23, and a release layer 24 are arranged in order from the outer surface.

Comparative Example 2
The styrene-butadiene latex was applied to the polyethylene laminated cloth so that the thickness after drying was 50 μm. The 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 predetermined dimension so that the thickness was 0.80 mm, and was attached to the surface of the styrene-butadiene latex. Then, the basis weight was transferred to the elastic layer using sandpaper, and crosslinking was performed by heating at 170° C. for 4.5 minutes under a pressure of 5 kg/cm ² , and the elastic layer was made into 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 the release paper so that the thickness after drying was 50 μm, and transferred to the polyethylene laminated cloth side, to obtain the rubber strip shown in FIG. 4(b). This rubber strip has an elastic layer 31, a latex layer 32, a laminate cloth layer 33, an adhesive layer 34, and a release layer 35 arranged in this order from the outer surface.

Comparative Example 3
A nitrile rubber composition containing an ester-based plasticizer was weighed as an elastic layer, and kneaded with two metal rolls. The kneaded nitrile rubber composition was sheeted to a predetermined size so as to have a thickness of 0.80 mm, and was attached to one side of the cotton cloth, which was a reinforcing layer. Then, the basis weight was transferred to the elastic layer using sandpaper, and crosslinking was performed by heating at 170°C for 4.5 minutes under a pressure of 5 kg/ ^cm2 to obtain a surface layer unit in which the elastic layer was 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 the cotton cloth side of the surface layer unit with two rolls at 160 degrees. This rubber strip has an elastic layer, a reinforcing layer, an adhesive layer made of a thermoplastic urethane adhesive, a resin film layer, a pressure sensitive adhesive layer, and a release layer arranged in this order from the outer surface.

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

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

<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 for 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, by gripping the end of the test piece and folding it back 180 degrees, and measuring the load at which the test piece peeled off from the stainless steel plate. 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.

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 was 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 believed 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. Comparative Example 2 was provided with styrene-butadiene latex and polyethylene laminate cloth as a plasticizer migration prevention layer, but was unable to sufficiently prevent the migration of the plasticizer, and a decrease in adhesive strength and adhesive residue were observed over time. Comparative Examples 4 and 5, which have the same layer structure as Comparative Example 1, had low adhesive strength from the start of the test and adhesive residue was observed. No follow-up observations were made on these.

In addition, in Table 1, Comparative Example 3 left no glue residue and the adhesive strength was numerically good. However, with the rubber strip of Comparative Example 3, delamination occurred between the PET film and the cotton cloth when measuring the adhesive strength, 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.

<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 of 40°C and 100% humidity, and the adhesive strength between the PET film and the cotton cloth was evaluated after each number of days. The adhesive strength was measured by a T-peel test in accordance with JIS K6854-3. The results are shown in Table 2.

As shown in Table 2, the adhesive strength between the PET film and cotton cloth in Example 1 remained good with almost no change from the start of the test until 14 days had passed. 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 to bond the PET film and the surface layer, the adhesive strength can be maintained good regardless of the environment and interlayer peeling can be prevented. In this way, the rubber strip of the present invention can contribute to stable operation without problems such as peeling even in high temperature and humid environments.

The rubber strip of the present invention can be wound around the 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 goods. In addition, the rubber strip can be wound around the roller base material without applying adhesive, which contributes to stabilizing the winding and improving the environment and workability of workers.

REFERENCE SIGNS LIST 1 weaving device 2 press roller 3 press roller 4 surface roller 5 winding roller 6 loom 10 rubber strip 11 surface layer 11a elastic layer 11b reinforcing layer 12 adhesive layer 13 resin film layer 14 pressure sensitive adhesive layer 15 release layer

Claims (5)

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: The rubber strip according to claim 1, characterized in that the surface layer has a reinforcing layer interposed between the elastic layer and the adhesive layer. The rubber strip according to claim 1 or 2, characterized in that the resin film layer is 15 μm to 50 μm thick and is thinner than the adhesive layer. 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. 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:

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