Method for manufacturing an extruded product, method for manufacturing a protective cover, extruded product, protective cover, method for attaching a protective cover

Abstract

The present invention provides a method for manufacturing extruded products that can be produced even for products that have parts that are difficult to maintain their shape, such as protective covers on the side edges of belts. [Solution] A method for manufacturing an extruded product, comprising an extrusion step of co-extruding a first resin and a second resin arranged to surround a part of the first resin, characterized in that the first resin and the second resin are peelable in the molded state.

Description

Technical Field

[0005] ,

[0001] The present invention relates to a method for manufacturing an extruded product, a method for manufacturing a protective cover, an extruded product, a protective cover, and a method for attaching the protective cover.

Background Art

[0002] In a belt such as a conveyor belt, a protective cover may be attached to prevent fraying and damage to the belt side edge and to prevent injury to workers. Such a protective cover includes, for example, a long rubber cover having a U-shaped cross section, and is adhered so that the side edge of the belt is fitted into the U-shaped space portion.

[0003] To manufacture such a protective cover, for example, a long and thin rubber plate is bent into a U-shape, or it is formed by extrusion of resin.

[0004] In addition, as another method for protecting the edge of the belt, in the case of a belt made of a thermoplastic resin, while an operator presses a release paper and a mat against the edge of the belt, a heating plate is pressed against it from above and below to heat it, and the edge is melted and deformed so as to be rounded with the resin of the belt to protect the edge (see, for example, Patent Document 1). Also, there is a method of protecting the edge by pressing a string-like contour material made of a thermoplastic resin against the edge of the belt and welding it with a welding device and a hot air nozzle (see, for example, Patent Document 2).

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

[0006] However, while large conveyor belts can be manufactured using the above method, it is difficult to manufacture small conveyor belts, such as those used in conveyor belt sushi restaurants, using this method because the protective covers are small. For example, in the case of rubber sheets, bending is difficult due to their small size, and in the case of extrusion, the resin would stick together when extruded, and the upper and lower parts of the U-shape were thin and difficult to maintain their shape, making it difficult to mold them into the desired shape.

[0007] Furthermore, even after molding, maintaining the shape was difficult, as the upper and lower parts of the U-shape would stick together during storage or transportation. Moreover, this problem is not limited to the protective cover on the side edge of the belt; similar issues exist in other articles that have parts that are difficult to maintain their shape.

[0008] Furthermore, in attaching protective covers to belt edges, conventional methods such as those described in Patent Documents 1 and 2 require workers to press a mat against the edge while working, and also necessitate separate equipment such as welding devices and high-temperature air nozzles, making the attachment and processing of the belt edges cumbersome and time-consuming.

[0009] Therefore, the inventors of the present invention diligently researched the manufacturing of finished products having parts that are difficult to maintain their shape, such as the protective cover mentioned above, and conceived the idea of ​​using co-extrusion of resin. Co-extrusion is a method of manufacturing molded products by simultaneously extruding multiple different resins (see, for example, Patent Document 3).

[0010] The present invention aims to provide a method for manufacturing an extruded product, a method for manufacturing a protective cover, an extruded product, and a protective cover, which can be manufactured even for products having parts that are difficult to maintain their shape, such as a protective cover on the side edge of a belt. [Means for solving the problem]

[0011] A method for manufacturing an extruded article according to one aspect of the present invention is a manufacturing method for manufacturing a molded article by extruding a resin, comprising an extrusion step of co-extruding a first resin and a second resin arranged to surround a part of the first resin, characterized in that the first resin and the second resin are peelable in the molded state.

[0012] With this configuration, since the first resin and the second resin are detachable, the space left by the removed first resin portion can be easily formed by detaching and removing the first resin portion from the second resin portion after molding. For example, in the case of a U-shape, the area enclosed by the top, bottom, and right sides of the U-shape can be made into a space, and a molded product including the horizontal bars at the top and bottom of the U-shape can be easily manufactured. Note that "enclosing a part of the first resin" means that the ends of the first resin are not enclosed but the periphery is enclosed by the second resin, or that a part of the periphery of the first resin is enclosed by the second resin.

[0013] Furthermore, the method for manufacturing this extruded product is characterized in that the first resin is non-adhesive or less adhesive than the second resin.

[0014] With this configuration, since the first resin is non-adhesive or weakly adhesive, it is easy to separate it from the second resin.

[0015] Furthermore, this method for manufacturing the extruded product is characterized in that the first resin is a resin with higher hardness than the second resin.

[0016] In this configuration, the first resin is a high-hardness resin, and this part acts as a framework, preventing bending due to differences in stress when the resin is extruded. Furthermore, when not in use and being stored, the shape of the molded product can be maintained by leaving the first resin in place without separating and removing it, and when in use, the shape can be maintained by separating and removing the first resin to obtain the finished product.

[0017] Furthermore, this method for manufacturing the extruded product is characterized in that the second resin is a tacky resin.

[0018] According to this configuration, since the second resin is a tacky resin, it is suitable for use as a protective cover for the belt edge portion due to its high adhesiveness and flexibility. On the other hand, in the case of a tacky resin, when extruding only the second resin or co-extruding it with other resins to be melted, it is difficult to maintain the shape during extrusion. However, by co-extruding with the first resin having a high peelable hardness, it is possible to manufacture a molded product that retains its shape even with the tacky second resin.

[0019] Also, in this method for manufacturing an extruded molded product, the first resin is any one of polypropylene, polyethylene, polyacetal, and polyethylene terephthalate, and the second resin is any one of polyurethane, polyolefin, polyvinyl chloride, ethylene-vinyl acetate copolymer resin, and polyamide.

[0020] According to this configuration, it is suitable in terms of the adhesiveness, hardness of the first resin, tackiness of the second resin, peelability between the first resin and the second resin, etc.

[0021] Also, in this method for manufacturing an extruded molded product, the extruded molded product is long, and in the molded state, a concave groove is formed along the longitudinal direction at the central portion in the width direction or at a predetermined interval in the width direction.

[0022] According to this configuration, cutting becomes easy along the concave groove, and it can be cleanly cut in half.

[0023] Also, this method for manufacturing an extruded molded product further includes a step of cooling the co-extruded product extruded by the extrusion step and a step of cutting the cooled co-extruded product.

[0024] Here, the cooling step can adopt various cooling methods such as a cooling method by natural drying or a cooling method by a gas or a liquid.

[0025] The manufacturing method of the protective cover according to one aspect of the present invention is a method for manufacturing a protective cover that protects the edge of a belt such as a conveyor belt, and includes a removal step of removing the first resin portion from the extrusion molded product manufactured by the above-described manufacturing method.

[0026] According to this configuration, by removing the first resin from the extrusion molded product, a space is formed in that portion. Thereby, even in a shape in which it is difficult to maintain the shape such that a space is formed, it can be manufactured easily and reliably.

[0027] Further, the manufacturing method of this protective cover is characterized by further including a cutting step of cutting the extrusion molded product along the longitudinal direction prior to the removal step.

[0028] According to this configuration, by cutting the extrusion molded product and removing the first resin, even in a shape having a U-shaped space and a convex edge portion extending on one side, it can be manufactured easily and reliably.

[0029] Further, in the manufacturing method of this protective cover, the extrusion molded product is long, and in the molded state, the first resin portion has convex portions formed vertically in the height direction along the longitudinal direction at the central portion in the width direction, and the second resin portion is segmented by the convex portions of the first resin portion.

[0030] According to this configuration, since the second resin is configured to be segmented left and right with the convex portion of the first resin as a boundary, without cutting the extrusion molded product, by peeling the second resin portion from the first resin, even in a shape having a U-shaped space and a convex edge portion extending on one side, cutting is not required and it can be manufactured more easily.

[0031] An extrusion molded product according to one aspect of the present invention is an extrusion molded product formed by extrusion of a resin, and includes a first resin portion and a second resin portion arranged so as to surround the first resin portion, and the first resin portion and the second resin portion are separable.

[0032] With this configuration, since the first resin and the second resin are detachable, the space left by the removed first resin portion can be easily formed by detaching and removing the first resin portion from the second resin portion.

[0033] Furthermore, this extruded product is characterized in that the first resin portion is made of a non-adhesive resin or a resin that is less adhesive than the second resin portion.

[0034] Furthermore, this extruded product is characterized in that the first resin portion has higher hardness than the second resin portion.

[0035] Furthermore, this extruded product is characterized in that the second resin portion is made of a tacky resin.

[0036] Furthermore, in this extruded product, the first resin portion is one of polypropylene, polyethylene, polyacetal, or polyethylene terephthalate, and the second resin portion is one of polyurethane, polyolefin, polyvinyl chloride, ethylene-vinyl acetate copolymer resin, or polyamide.

[0037] Furthermore, this extruded product is a long extruded product, characterized in that grooves are formed along the longitudinal direction in the central part in the width direction or at predetermined intervals in the width direction.

[0038] Furthermore, this extruded product is a long extruded product, characterized in that the first resin portion has protrusions formed in the central part in the width direction and in the vertical direction along the longitudinal direction, and the second resin portion is divided by the protrusions of the first resin portion. In addition, this extruded product can also be configured in which multiple first resin portions are formed.

[0039] Furthermore, a protective cover according to one aspect of the present invention is a protective cover for protecting the edge of a belt such as a conveyor belt, which is used in a state in which the extruded product described above is cut along the groove in the central part in the width direction and the first resin part is removed, and has a main body and a pair of convex edges extending parallel to the width direction from the upper and lower ends of the main body, and is characterized in that when attached to the edge of the belt, the edge of the belt is protected by the main body and the pair of convex edges.

[0040] With this configuration, even extruded products can be made into protective covers with complex shapes that are difficult to maintain, such as those with convex edges as described above, and the edges of the belt can be reliably protected.

[0041] Furthermore, this protective cover is a long protective cover with a thickness of 1 to 5 mm and a length in the width direction of 6 to 30 mm, and the thickness of the convex edge portion is 0.2 to 1 mm and its length in the width direction is 3 to 20 mm.

[0042] This configuration allows for a protective cover that can be used on a small belt.

[0043] Furthermore, this protective cover is a method for attaching any of the above-mentioned protective covers to the belt edge, and is characterized by comprising the steps of attaching the belt edge so that the pair of protruding edges sandwich it, and heating and melting the pair of protruding edges.

[0044] With this configuration, unlike conventional methods of protecting belt edges, which require the worker's skill to press a mat against the belt while welding, or necessitate separate welding equipment or high-temperature air nozzles, and involve cumbersome attachment and processing of the belt edge, this method allows for easier attachment of the protective cover by simply attaching a U-shaped protective cover to the edge and heating and melting the convex edge with a heating device such as a high-frequency welder.

[0045] Furthermore, in conventional configurations where the belt edge is encased in resin or the like, the seal width becomes small, and there is a risk that the protective part will be exposed prematurely due to wear. Also, in conventional cases where a semicircular resin is welded with an air nozzle, there is a risk that the welded interface will detach. However, with the U-shaped protective cover described above, it is possible to create a larger seal width, and the pair of U-shaped convex edges can be securely welded to the belt, thus minimizing the risk of exposure or detachment of the protective part.

[0046] Furthermore, while conventional belt edge protection methods tend to result in thicker welded areas on the belt surface, thinning the upper and lower molten surfaces of the U-shape reduces the step difference in the molten surface, thereby suppressing snagging on the belt surface. [Effects of the Invention]

[0047] According to the present invention's method for manufacturing extruded articles, even molded articles having parts that are difficult to maintain their shape can be manufactured by extrusion molding. [Brief explanation of the drawing]

[0048] [Figure 1] Cross-sectional view showing a protective cover according to one embodiment of the present invention. [Figure 2] An explanatory diagram showing protective covers according to one embodiment of the present invention attached to both side edges of a belt. [Figure 3] (a) Perspective view of an extruded product according to one embodiment of the present invention, (b) Cross-sectional view [Figure 4] Diagram illustrating the manufacturing process of an extruded product according to one embodiment of the present invention. [Figure 5] Explanatory diagram of the cross-section of the first mold used in the manufacturing process of an extruded product according to one embodiment of the present invention. [Figure 6] Cross-sectional diagram of a second mold used in the manufacturing process of an extruded product according to one embodiment of the present invention. [Figure 7] Cross-sectional view of a modified example of an extruded product according to one embodiment of the present invention. [Figure 8] Cross-sectional view of the component after cutting the extruded product shown in Figure 7 and removing the first resin portion. [Figure 9] Diagram illustrating the attachment of the components shown in Figure 8 to two belts. [Figure 10] Cross-sectional view of another modified example of an extruded product according to one embodiment of the present invention. [Figure 11] Cross-sectional view of a modified example of an extruded product according to one embodiment of the present invention. [Modes for carrying out the invention]

[0049] The following describes in detail, with reference to the drawings, a method for manufacturing an extruded product, a method for manufacturing a protective cover, an extruded product, and a protective cover according to one embodiment of the present invention. However, the present invention is not limited to this embodiment. Furthermore, in the following embodiments, two types of extruded products using polypropylene as the first resin and polyurethane as the second resin are described as examples, but the present invention is not limited to these resins, and other resins can also be used.

[0050] <1. Structure of the protective cover> Figure 1 is a cross-sectional view showing a protective cover according to one embodiment of the present invention. Figure 2 is an explanatory diagram showing the protective cover according to one embodiment of the present invention attached to both side edges of a belt.

[0051] As shown in Figure 1, the protective cover 1 of this embodiment is a long protective cover that protects the edge of a belt 100 such as a small conveyor belt. It has a main body 1a and a pair of convex edges 1b, 1b that extend parallel to the width direction X from the ends of the upper and lower surfaces of the main body 1a. When attached to the edge of the belt 100, the edge of the belt 100 is protected by the main body 1a and the pair of convex edges 1b, 1b.

[0052] Specifically, a space is formed in the gap A between the pair of protruding edges 1b, 1b that extend parallel from the upper and lower surfaces on one side of the main body 1a, and the side edge of the belt 100 fits into this space, protecting the edge of the belt 100. Figure 2 shows the state in which two protective covers 1 are attached to the side edges on both sides of the belt 100.

[0053] For example, if belt 100 is a thin flat belt with a thickness of 1.5 mm, the protective cover 1 will have an overall thickness L1 of approximately 2.5 mm, a thickness L2 of approximately 0.5 mm for the convex edge portion 1b, and an overall length L3 of approximately 12 mm. In this case, the length L5 of the convex edge portion 1b will be approximately 7 mm, occupying more than half of the overall length L3. Therefore, the width L4 of the portion where the belt is sandwiched will be approximately 1.5 mm, and the length L5 will be approximately 7 mm, resulting in a long, narrow gap A. The protective cover 1 will then protect the portion of belt 100 from the side edge to the center, approximately 12 mm in length. Note that the above dimensions are just one example of this embodiment.

[0054] Furthermore, the protective cover 1, for example, uses polyurethane, a material with high drawdown and tack properties. The thickness L2 of the convex edge 1b is thin, about 0.5 mm, and the length L5 is long, about 7 mm. The gap A between the convex edges 1b is small, about 1.5 mm wide. Therefore, if it were to be manufactured by general extrusion molding, the gap A would easily close, making it difficult to maintain its shape. This problem can be solved by using the manufacturing method described later.

[0055] Note that protective cover 1 is just one example; when used on a thin belt, it may have a thickness of 2-5 mm, a width of 6-30 mm, a thickness of 0.2-1 mm at the raised edge, and a width of 3-25 mm.

[0056] The protective cover 1 is attached to the edge of the belt 100 by attaching a pair of convex edges 1b to one edge of the belt 100 so as to sandwich the edge, and then heating and melting the pair of convex edges 1b using a heating device such as a high-frequency welder to weld them to the belt 100. The same procedure is followed for the other edge of the belt 100 (see Figure 2).

[0057] Thus, by using the protective cover 1 of this embodiment, the operator's skill, such as pressing a mat against the belt edge while welding, is not required, as in conventional methods of protecting belt edges. Furthermore, large-scale welding equipment and high-temperature air nozzles are not necessary, and the protective cover can be easily attached to the belt edge.

[0058] In other words, in the case of conventional configurations where the belt edge is wrapped in resin or the like, the seal width becomes small, and there is a risk that the protective part will be exposed prematurely due to wear. Also, in the case of conventional air nozzles that weld a semicircular resin, there is a risk that the welded interface will fall off. However, with this protective cover 1, it is possible to create a larger seal width, and the pair of U-shaped convex edges can be firmly welded to the belt, thus minimizing the risk of exposure or detachment of the protective part.

[0059] Specifically, with conventional methods, for example, when using a 0.5 mm thick sheet, the distance at which the urethane melts from the belt edge can only be about 1 mm. However, by using the protective cover of this embodiment, a sufficient sealing width of, for example, 5 mm or 7 mm can be achieved, significantly improving the lifespan due to wear.

[0060] Furthermore, if one attempts to ensure a longer seal width using conventional methods, for example, one might consider cutting a 2mm thick urethane sheet, inserting the belt, and melting it. However, in this case, the thickness of the convex edge would be 1mm, and the step would not be completely melted, resulting in a lack of quality and processing stability. Therefore, by using the protective cover of this embodiment, it is possible to increase the seal width while keeping the thickness of the convex edge thin, which offers significant advantages over conventional methods.

[0061] Furthermore, in the storage state, the protective cover 1 of this embodiment is preferably in the form of an extruded product, as described below.

[0062] <2. Structure of extruded products> Figure 3(a) is a perspective view of an extruded product according to one embodiment of the present invention, and (b) is a cross-sectional view. As shown in Figure 3, the extruded product 2 of this embodiment is an extruded product formed by extruding resin, and comprises a first resin part 3 and a second resin part 4 arranged to surround the first resin part 3, and the first resin part 3 and the second resin part 4 are peelable.

[0063] Furthermore, the extruded product 2 has a groove 4a formed in the central part in the width direction X, along the longitudinal direction Y. Note that the groove 4a is not limited to the central part in the width direction; it is also possible to have a configuration in which multiple grooves are formed along the longitudinal direction at predetermined intervals in the width direction (see Figure 7).

[0064] Furthermore, the extruded product 2 has a non-adhesive first resin part 3 and is highly detachable from the second resin part 4. The first resin part 3 is not limited to being non-adhesive; it may be made of a resin that is less adhesive than the second resin part 4, as long as it can be separated from the second resin part 4.

[0065] Furthermore, the second resin part 4 is made of a tacky resin, and the first resin part 3 is made of a resin with higher hardness than the second resin part 4. In this way, the tacky resin of the second resin part 4, which acts as a protective cover, increases its adhesion to the belt edge, and it is also suitable for belts that move, such as conveyor belts, as it offers high flexibility. In addition, since the first resin part 3 is made of a high-hardness resin, it forms the skeleton of the extruded product 2, which is suitable for maintaining the shape of the extruded product 2 and the second resin part 4 and for handling during storage and transportation.

[0066] Furthermore, as shown in Figure 2, the extruded product 2 of this embodiment is a thin, long, flat plate-shaped molded product, in which the first resin part 3 is molded into a belt shape of a predetermined thickness, and the second resin part 4 is molded into a flat belt shape of a predetermined thickness so as to cover all sides of the first resin part 3. In addition, grooves 4a, 4a are formed along the longitudinal direction in the center of the width direction X on the upper and lower surfaces of the second resin part 4. These grooves 4a serve as markers when cutting and facilitate cutting.

[0067] Furthermore, the groove 4a can have a certain effect even if it is present on only one of the upper or lower surfaces. Also, the groove 4a is not limited to the central part in the width direction, but can also be formed as grooves along the longitudinal direction with predetermined intervals in the width direction (see Figure 5).

[0068] The extruded product 2 is cut along the groove 4a and the first resin part 3 is removed to form the protective cover 1 (see Figure 1). However, if the product is stored or transported in the protective cover 1 state, the upper and lower pair of convex edges 4a of the second resin part 4 may stick together or break, making it difficult to maintain its shape. Therefore, it is desirable to store and transport the product in the extruded product 2 state and use it in the protective cover 1 state.

[0069] Furthermore, as will be explained below, this extruded product 2 is manufactured by co-extruding the first resin part 3 while it is encased in the second resin part 4.

[0070] <3. Method for manufacturing extruded articles>

[0071] Next, we will explain the method for manufacturing the extruded product 2. Figure 4 is an explanatory diagram showing the manufacturing process of an extruded product according to one embodiment of the present invention. Figure 5 is an explanatory diagram of the cross-section of the first mold used in the extruder in the manufacturing process. Figure 6 is an explanatory diagram of the cross-section of the second mold used in the extruder in the manufacturing process.

[0072] As shown in Figure 4, in this embodiment, first, as an example, a first resin material made of polypropylene and a second resin material made of polyurethane are each fed into the extruder. Then, the first and second resin materials are each carried toward a mold (die) attached to the tip by a screw or the like. The temperature range for the first resin material made of polypropylene is 180°C to 280°C, and the temperature range for the second resin material made of polyurethane is 130°C to 250°C.

[0073] The first resin material then passes through the cavity 11a of the first mold 11 and fills the cavity 12a of the second mold 12. Meanwhile, as the second resin material passes through the cavity 11b of the first mold 11, it is covered by the first resin material, and sufficient pressure is applied to enhance adhesion. Finally, the first resin material and the second resin material surrounded by it are extruded together as a single unit from the opening 12b of the second mold 12.

[0074] The co-extruded products of the first and second resins are then transported to a cooling bed where the resins are cooled. The cooling bed can utilize any known cooling method, such as natural drying, air, or liquid.

[0075] The co-extruded product, having passed through the cooling layer, is gradually solidified as it is pulled out by a take-up machine, and then transported to a cutting machine where it is cut to a predetermined length.

[0076] This process completes an extruded product 2 comprising a rigid polypropylene first resin part 3 and a tacky polyurethane second resin part 4 that is tightly arranged to surround it (see Figure 3).

[0077] Furthermore, it is also possible to manufacture the protective cover 1 by cutting the extruded product 2 manufactured as described above along the groove portion 4a and removing the first resin portion 3 (see Figure 1). However, if the product is stored or transported with the protective cover 1 attached, the upper and lower pair of convex edges 4a of the second resin portion 4 may stick together or break, making it difficult to maintain its shape. Therefore, it is desirable to store and transport the product in the state of the extruded product 2 and to use it with the protective cover 1 attached. In this embodiment, the extruded product 2 is a thin, flat plate in which the first resin portion 3 is made of hard polypropylene and the second resin portion 4 is made of tacky polyurethane, so it can be easily cut along the groove portion 4a.

[0078] <4. Other Embodiments> As described above, preferred embodiments of the present invention have been explained, but various additions, modifications, or deletions are possible without departing from the spirit of the present invention.

[0079] For example, in this embodiment, the extruded product 2 has a configuration in which the second resin part 4 covers the first resin part 3 of 1, but it is not limited to this, and it is also possible to have a configuration in which the first resin part is arranged in two or three places. Figure 7 is a cross-sectional view of the extruded product 2A in which the first resin part 3A is arranged in three places. As shown in Figures 8 and 9, by cutting this extruded product 2A along the groove 4Aa, it is possible to make a member like an H-beam with both sides hollow, which can be used when joining two belts together.

[0080] Furthermore, in this embodiment, the extruded product 2 is configured such that the second resin part 4 covers the entire perimeter of the side surface of the first resin part 3, and can be cut and the first resin part 3 removed to be used as a protective cover. However, as shown in Figure 10, it is also conceivable to have an extruded product 2B in which the second resin part 4B covers a part of the perimeter of the side surface of the first resin part 3B, and can be used as a protective cover by removing the first resin part 3B.

[0081] Furthermore, while the extruded product 2 of this embodiment is assumed to be cut along the central groove 4a in order to remove the first resin part 3, as shown in the extruded product 2C of Figure 11(a), it is also possible to configure the first resin part so that the upper and lower parts of the central portion protrude as 3C, and the upper and lower protrusions 3Ca separate the left and right second resin parts 4C, allowing the second resin parts 4C to be peeled off and separated without cutting (Figure 11(b)). In addition, it is also possible to configure the first resin part 3C to consist of multiple first resin parts 3C (Figures 11(c)(d)).

[0082] Furthermore, although this embodiment describes a protective cover for the side edge of a belt as an example, the present invention is not limited to this. The present invention can be applied to any configuration that is made of a highly tacky resin and is difficult to maintain its shape, such as a thin-walled protruding portion in the shape of a cantilever beam.

[0083] Furthermore, although this embodiment describes extrusion molding as an example, the product is not limited to this and can also be manufactured using other resin molding methods such as injection molding or lamination molding using multiple resins.

[0084] Furthermore, although this embodiment describes an extruded product using polypropylene and polyurethane resin materials, the present invention can be applied to any combination of materials in which the first resin is non-sticky or weakly sticky and has sufficient hardness to form a skeleton, the second resin is tacky, and these materials are peelable. For example, polyethylene, polyacetal, polyethylene terephthalate, etc. can be used as the first resin, and polyolefin, polyvinyl chloride, ethylene-vinyl acetate copolymer resin, polyamide, etc. can be used as the second resin. [Explanation of Symbols]

[0085] 1. Protective cover 2. Extruded products 3. First resin part 4. Second resin part 4a Concave groove 11. First mold 11a Cavity 11b Cavity 12. Second mold 12a Cavity 12b opening 100 belts 2A Extruded product (modified version) 3A 1st resin part 4A Second resin part 4Aa Concave groove part 2B Extruded product (modified version) 3B 1st resin part 4B 2nd resin part 2C Extruded product (modified version) 3C 1st resin part 3Ca protrusion 4C 2nd resin part

Claims

1. A method for manufacturing extruded products, which involves extruding resin to produce molded products. The process includes an extrusion step of co-extruding a first resin and a second resin arranged to surround a part of the first resin, The first resin and the second resin are characterized in that they are peelable in the molded state. A method for manufacturing extruded products.

2. The first resin is characterized by being non-adhesive or having weaker adhesion than the second resin. A method for manufacturing an extruded article according to claim 1.

3. In the molded state, the first resin is characterized in that it is a resin with higher hardness than the second resin. A method for manufacturing an extruded article according to claim 2.

4. The second resin is characterized in that it is a tacky resin. A method for manufacturing an extruded article according to claim 1.

5. The first resin is one of polypropylene, polyethylene, polyacetal, or polyethylene terephthalate. The second resin is one of polyurethane, polyolefin, polyvinyl chloride, ethylene-vinyl acetate copolymer resin, or polyamide. A method for manufacturing an extruded article according to claim 1.

6. The extruded product is long, In the molded state, grooves are formed along the longitudinal direction, either in the central part in the width direction or at predetermined intervals in the width direction. A method for manufacturing an extruded article according to claim 1.

7. The extruded product is long, In the molded state, the first resin has protrusions formed in the central part in the width direction, and in the vertical direction along the longitudinal direction. The second resin is characterized by being divided by the protrusions of the first resin, The extruded article according to claim 1.

8. A step of cooling the co-extruded product extruded by the aforementioned extrusion step, The process further includes cutting the co-extruded product after cooling. A method for manufacturing an extruded article according to claim 1.

9. This is a method for manufacturing a protective cover that protects the edges of belts such as conveyor belts. The invention is characterized by comprising a removal step of removing the first resin portion from an extruded product manufactured by any one of claims 1 to 8, A method for manufacturing a protective cover.

10. The invention further comprises a cutting step of cutting the extruded product along its longitudinal direction prior to the removal step, A method for manufacturing a protective cover according to claim 9.

11. It is an extruded product formed by extruding resin, First resin part, It comprises a second resin part arranged to surround a part of the first resin part, The first resin portion and the second resin portion are characterized in that they are detachable. Extruded product.

12. The first resin portion is characterized by being a non-adhesive resin or a resin that is weaker than the second resin portion. The extruded product according to claim 11.

13. The first resin part is characterized by having a higher hardness than the second resin part. The extruded product according to claim 11.

14. The second resin part is characterized by being a tacky resin. The extruded product according to claim 11.

15. The first resin part is one of polypropylene, polyethylene, polyacetal, or polyethylene terephthalate. The second resin part is one of polyurethane, polyolefin, polyvinyl chloride, ethylene-vinyl acetate copolymer resin, or polyamide. The extruded product according to claim 11.

16. It is a long extruded product, A groove is formed along the longitudinal direction, either in the central part in the width direction or at predetermined intervals in the width direction. The extruded product according to claim 11.

17. It is a long extruded product, The first resin part has protrusions formed in the central part in the width direction, and in the vertical direction along the longitudinal direction, The second resin portion is divided by the protrusion of the first resin portion. The extruded product according to claim 11.

18. Multiple first resin parts are formed, The extruded product according to claim 17.

19. An extruded product according to any one of claims 11 to 18 is used in a state in which it is cut along the groove in the central part in the width direction and the first resin part is removed, and is a protective cover for protecting the edge of a belt such as a conveyor belt. It has a main body and a pair of convex edges extending parallel to the width direction from the upper and lower ends of the main body. The main body and the pair of convex edges protect the edge of the belt when the main body is attached to the edge of the belt. Protective cover.

20. It is a long protective cover, The thickness is 1 to 5 mm, and the length in the width direction is 6 to 30 mm. The thickness of the convex edge is 0.2 to 1 mm, and its length in the width direction is 3 to 20 mm. The protective cover according to claim 19.

21. A method for attaching the protective cover to the belt edge according to claim 19, The process of attaching the belt edge so that it is sandwiched between the pair of convex edges, The process includes heating and melting the pair of convex edges. How to attach the protective cover.

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