JP7531984B2 - Conveyor roller for resin sheet manufacturing equipment - Google Patents

Description

The present invention relates to a conveying roller used in a resin sheet manufacturing device.

Resin sheets are manufactured from resin materials such as thermoplastic resins and rubber, and are used for a variety of purposes. Resin sheets are manufactured, for example, by extruding plasticized resin material, rolling it to a specified thickness and width using rollers, hardening it, and then pulling out the sheet of the specified thickness.

For example, Patent Document 1 discloses a manufacturing apparatus in which a thermoplastic resin is extruded from an extruder, formed into a sheet material of a predetermined thickness using mirror-finished rolling rollers, then slowly cooled by conveying rollers through a heating furnace, and taken up by take-up rollers to obtain a thermoplastic resin sheet.
Furthermore, Patent Document 2 discloses a method for manufacturing an uneven thickness resin sheet, in which the uneven thickness resin sheet is obtained by passing resin extruded from a die by an extruder through forming rollers and cooling rollers to give it a predetermined cross section, passing it through a heating device or heat treatment device equipped with conveying rollers, and then cooling it.

In resin sheet manufacturing equipment, conveying rollers are typically used in heating furnaces, heat treatment devices, and cooling devices to convey the resin sheet. For example, in Patent Document 1, metal conveying rollers are used in the heating furnace. In some cases, conveying rollers are used to apply tension and driving force to the sheet.

Japanese Patent Application Publication No. 11-320656 JP 2009-220440 A

However, resin sheets manufactured by resin sheet manufacturing equipment and raw resin materials may be sticky. Uncrosslinked rubber is particularly sticky. Furthermore, when the resin material that constitutes the resin sheet is processed into a sheet shape, the resin sheet and resin material are likely to become sticky at high temperatures. If the resin sheet becomes sticky during processing, defects such as the resin sheet being wrapped around the conveying rollers or the conveyed sheet being deflected or conveyed unevenly, causing uneven thickness in the sheet, are likely to occur. In such cases, it is desirable for the conveying rollers for the resin sheet manufacturing equipment to be ones to which the resin material is less likely to stick.

In addition, when the transport rollers are used in a heating device or heat treatment device, these transport rollers become very hot. Hot transport rollers are difficult to handle, and roller replacement and maintenance work becomes cumbersome.

The object of the present invention is to provide a conveying roller for a resin sheet manufacturing device that can suppress adhesion of the resin sheet. Another object of the present invention is to improve the handleability of the conveying roller, which becomes hot, and to make replacement and maintenance of the conveying roller more efficient.

After extensive research, the inventor discovered that at least one of the above problems could be solved by integrating a braided tube made by braiding resin monofilaments into a cylindrical shape with the core material of the conveying roller so that the braided tube is exposed to the outer periphery of the roller, and thus completed the present invention.

The present invention is a conveying roller used in a heating device or heat treatment device of a resin sheet manufacturing apparatus, the conveying roller having a core material of the roller and a braided tube in which resin monofilaments are braided into a cylindrical shape, and the core material and the braided tube are integrated so that when the core material is inserted into the braided tube, the resin filaments of the braided tube are exposed in a dotted pattern on the outermost circumference of the conveying roller (first invention).

In the first invention, preferably, the braided structure of the braided tube is plain weave (second invention). In the first or second invention, preferably, the resin material constituting the resin monofilament has a durometer of HDD50-95 measured in accordance with JIS K 7215, or a Rockwell hardness of HRR50-115 or HRD50-115 measured in accordance with JIS K 7202-2 (third invention). In the third invention, preferably, the resin material constituting the resin monofilament is a resin material mainly composed of any one of polyphenylene sulfide resin, polyethylene terephthalate resin, polyamide resin, and copolymer of tetrafluoroethylene and perfluoroalkoxyethylene (fourth invention).

According to the conveying roller for a resin sheet manufacturing apparatus of the present invention (first invention), the contact between the resin sheet and the conveying roller becomes close to point contact, and adhesion of the resin sheet to the conveying roller in the heating device or heat treatment device of the resin sheet manufacturing apparatus can be suppressed. Also, the conveying roller (first invention) used in the heating device or heat treatment device of the resin sheet manufacturing apparatus of the present invention does not easily transmit heat from the roller core material to the outer circumferential surface of the conveying roller, improving the handleability when the conveying roller becomes hot, and enabling efficient replacement and maintenance of the conveying roller.

Furthermore, when the second, third, and fourth inventions are adopted, the adhesion suppression effect and ease of handling at high temperatures are further improved.

FIG. 2 is a perspective view showing a conveying roller according to the first embodiment. 1 is a perspective view illustrating a structure and a manufacturing method of a conveying roller according to a first embodiment.

The following describes an embodiment of the invention with reference to the drawings, taking as an example a conveying roller used in a manufacturing device for resin sheets (particularly rubber sheets). The invention is not limited to the specific embodiments shown below, and can be implemented by modifying the form.

Figure 1 is a perspective view showing a conveying roller 1 of the first embodiment. The conveying roller 1 has a roller core material 12 and a braided tube 11. The braided tube 11 is made by braiding resin monofilaments (11a, 11b) into a cylindrical shape.

The core material 12 and the braided tube 11 are integrated with each other in a state where the core material 12 is inserted into the cylindrical braided tube 11. The means of integration is not particularly limited, and integration using an adhesive or the like may be used. The core material 12 and the braided tube 11 are integrated such that the resin monofilaments of the braided tube 11 are exposed in a dotted manner on the outermost circumference of the conveying roller 1, thereby forming the conveying roller 1. Another layer (e.g., an elastic layer) may be provided between the core material 12 and the braided tube 11.

The conveying roller 1 is used as a conveying roller in a heating device or a heat treatment device of a resin sheet manufacturing apparatus. In the resin sheet manufacturing apparatus, when a resin sheet or a resin material is conveyed by the conveying roller 1, the resin sheet or the resin material is in point contact with the braided tube exposed on the outer periphery of the conveying roller.

The specific configuration of the core material 12 is not particularly limited as long as the conveying function of the conveying roller 1 is exerted. Typically, the core material 12 is formed into a cylindrical shape from metal or the like, and has a bearing, shaft, hole, etc. in the central axis portion. The core material 12 may be formed with a key groove, gears, pulleys, etc. so that a driving force can be applied by the conveying roller 1.

The braided tube 11 will now be described. In the braided tube 11, the cylindrical braiding is performed by preparing multiple resin monofilaments, arranging half of them (11a, 11a...) in a right-handed spiral and the remaining half (11b, 11b...) in a left-handed spiral, and weaving them so that the sides that become the outer periphery are switched at the positions where the resin monofilaments with different winding directions intersect. A braided tube with this structure is also commonly known as a braided tube.

As shown in the partially enlarged view of FIG. 1, the braided tube 11 has a structure similar to that of a woven fabric when viewed in part, with resin monofilaments 11a, 11a arranged in a first direction passing radially outside and inside of resin filaments 11b, 11b arranged in a second direction intersecting the first direction. Preferably, each resin monofilament is braided individually (single piece) to correspond to the warp and weft threads of the woven fabric structure. Note that multiple resin monofilaments may be pulled together and braided into bundles to correspond to the warp and weft threads of the woven fabric structure.

1, it is preferable that the braided tube 11 has a woven structure when viewed partially, in which the resin monofilaments 11a corresponding to the warp threads and the resin monofilaments 11b corresponding to the weft threads alternately rise and fall and cross each other like a plain weave fabric. In other words, it is preferable that the braided tube 11 has a plain weave braid structure.
The braided structure of the braided tube 11 is not limited to a plain weave, but may be a twill weave (diagonal weave), in particular a four-ply double-sided twill weave, or a satin weave.

The resin monofilaments 11a and 11b that make up the braided tube 11 will now be described. The resin monofilament can be a resin, preferably a thermoplastic resin, extruded into a string shape with a predetermined cross section, typically a circular cross section. The resin monofilament may be coated as appropriate. In addition, the resin material that makes up the resin monofilament preferably has a durometer hardness of HDD 50 to 95 measured in accordance with JIS K 7215, or a Rockwell hardness of HRR 50 to 115 or HRD 50 to 115 measured in accordance with JIS K 7202-2.

The resin material constituting the resin monofilaments 11a and 11b is not particularly limited, but is preferably a resin material mainly composed of any one of polyphenylene sulfide (PPS) resin, polyethylene terephthalate (PET) resin, polyamide (PA) resin, and copolymer of tetrafluoroethylene and perfluoroalkoxyethylene (PFA resin). The polyamide resin may be an aromatic polyamide resin. In this embodiment, the resin monofilament constituting the braided tube 11 is composed of a resin material mainly composed of polyphenylene sulfide (PPS) resin. As a braided tube braided with monofilaments of a resin material, a commercially available product as a protective tube for cables, etc. can also be used.

Figure 2 shows an example of the structure and manufacturing method of the conveying roller 1 of the first embodiment. The braided tube 11 is adjusted to a predetermined length, and the core material 12 is passed through the tube, and the two are integrated at a predetermined position. The braided tube 11 has the property of expanding in diameter when contracted in the length direction, and contracting in diameter when stretched in the length direction. By utilizing this property, it is easy to insert the core material 12 into the braided tube 11 and to adhere it closely to and integrate it with the core material 12.

Because the braided tube 11 is composed of multiple resin monofilaments 11a, 11b, it is preferable to perform appropriate end treatment (e.g., tape wrapping) at the longitudinal ends of the braided tube 11 to prevent the resin monofilaments from falling apart.

The operation and effects of the transport roller 1 of the first embodiment will be described.
In the conveying roller 1, a braided tube 11 formed by braiding resin monofilaments into a cylindrical shape is arranged so as to be exposed on the outer periphery of the conveying roller 1. Therefore, at the outermost periphery of the conveying roll, the resin monofilaments that appear alternately on the radially outward side in the woven fabric appear as dots or short lines and are exposed. When a resin sheet is conveyed with such a conveying roller 1, the contact between the resin sheet and the conveying roller 1 becomes close to point contact, and adhesion between the conveying roller and the resin sheet in the resin sheet manufacturing apparatus can be suppressed.

In addition, the braided tube 11, which is made by braiding resin monofilaments into a cylindrical shape with a braided structure of either a plain weave, twill weave, or satin weave, has many empty spaces when viewed in cross section. As a result, the heat capacity of the braided tube 11 itself is small, and heat conduction from the core material 12 to the outer surface of the roller is also poor. Therefore, even if the conveying roller 1 in the resin sheet manufacturing device becomes hot, the heat of the roller core material is not easily transferred to the outer surface of the conveying roller, and even if the surface of the roller comes into contact with the human body, burns are less likely to occur, and handling of the conveying roller when it becomes hot is improved. This makes it possible to efficiently replace and maintain the conveying roller. In the case of a braided tube of resin monofilament, the contact area at the outermost circumference is dotted, which also contributes to preventing burns and making replacement more efficient.

In addition, when the braided tube 11 has a plain weave structure, as in the conveying roller 1 of the first embodiment, the degree of bending of the monofilament due to the woven structure of the resin monofilament increases, and the point-like contact area at the outermost periphery of the conveying roller becomes more pronounced, thereby further improving the adhesion suppression effect and ease of handling at high temperatures.

When the sheet manufacturing equipment to which the conveying roller is applied is a rubber manufacturing equipment, the uncrosslinked rubber material is particularly likely to stick to the roller. From the viewpoint of further suppressing adhesion between the conveying roller and the resin material of the sheet, it is preferable to increase the void ratio of the braided tube. The void ratio of the braided tube can be increased by using thick resin filaments or by widening the intervals between the resin filaments to make the braiding more sparse. In addition, when the braided structure is a plain weave, the void ratio of the braided tube can also be increased by making the angle between the right-handed spiral monofilament and the left-handed spiral monofilament closer to 90 degrees.

On the other hand, if you want to increase the driving force of the conveying roller, you can make the angle between the right-handed and left-handed spiral monofilaments smaller.

Furthermore, when the resin material constituting the resin monofilament, as in the conveying roller 1 of the first embodiment described above, has a durometer hardness of HD50 to 95 measured in accordance with JIS K 7215, or a Rockwell hardness of HRR50 to 115 or HRD50 to 115 measured in accordance with JIS K 7202-2, the resin monofilament becomes less likely to be crushed, and the braid structure becomes more three-dimensional in the thickness direction, which particularly improves the adhesion suppression effect and the ease of handling at high temperatures.

Furthermore, when the resin material constituting the resin monofilament is a resin material mainly composed of any one of polyphenylene sulfide resin, polyethylene terephthalate resin, polyamide resin, and a copolymer of tetrafluoroethylene and perfluoroalkoxyethylene, as in the conveying roller 1 of the first embodiment described above, the adhesion suppression effect is further improved.
In addition, the resin material constituting the resin monofilament is preferably selected so that the melting point and softening point of the resin material are 20° C. or more higher, more preferably 40° C. or more higher than the operating temperature of the conveying roller in the resin sheet manufacturing apparatus.

The invention is not limited to the above-described embodiment, and can be implemented with various modifications. Other embodiments of the invention are described below, but in the following description, the differences from the above-described embodiment will be mainly described, and detailed descriptions of similar parts will be omitted. Furthermore, these embodiments can be implemented by combining parts with each other, or by substituting parts.

The shape of the conveying roller is typically cylindrical or columnar, but is not limited to this. The conveying roller may also be tapered so that one end is smaller in diameter than the other end. The conveying roller may also be barrel-shaped with a larger diameter in the center of the roller, or may be constricted with a smaller diameter in the center of the roller. By utilizing the expansion and contraction of the braided tube 11, the core material and the braided tube can be tightly attached and integrated even in rollers of this shape.

The cross-sectional shape of the resin monofilament that constitutes the braided tube 11 may be circular, elliptical, triangular, or rectangular. In addition, the resin monofilament may be coated as necessary for purposes such as preventing dirt and static electricity.

The resin sheet manufactured by the resin sheet manufacturing apparatus using the conveying roller 1 of the above embodiment is not particularly limited. The resin material constituting the resin sheet may be rubber, thermoplastic elastomer, thermoplastic resin, or thermosetting resin. In addition, the resin sheet may be a single-layer sheet, or may be a resin sheet having a laminated structure.

The transport roller can be used in a heating device or a heat treatment device of a resin sheet manufacturing apparatus, and is highly industrially useful because it can transport resin materials and resin sheets.

1 Conveyor roller 11 Braided tube 11a, 11b Resin monofilament 12 Core material

Claims (4)

A conveying roller used in a heating device or a heat treatment device of a resin sheet manufacturing apparatus,
The conveying roller is
A core material of the roller;
The braided tube is made by braiding resin monofilaments into a cylindrical shape.
The core material and the braided tube are integrated together such that, with the core material inserted into the braided tube, the resin monofilament of the braided tube is exposed in a dotted manner on the outermost peripheral portion of the conveying roller.
Conveyor roller for resin sheet manufacturing equipment. The braided tube has a plain weave structure.
The transport roller for use in a resin sheet manufacturing apparatus according to claim 1 . The resin material constituting the resin monofilament has a durometer hardness of HDD50 to 95 as measured in accordance with JIS K 7215, or a Rockwell hardness of HRR50 to 115 or HRD50 to 115 as measured in accordance with JIS K 7202-2.
The transport roller for use in a resin sheet manufacturing apparatus according to claim 1 or 2. The resin material constituting the resin monofilament is a resin material mainly composed of any one of polyphenylene sulfide resin, polyethylene terephthalate resin, polyamide resin, and a copolymer of tetrafluoroethylene and perfluoroalkoxyethylene.
The transport roller for a resin sheet manufacturing apparatus according to claim 3 .

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