JP2012082035A - Method for manufacturing conveyor belt and conveyor belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a conveyer belt having uniform appearance to improve a work environment.SOLUTION: Pressing is performed with sheet-like intermediate materials 5 and 6 interposed between heating plates 2 and 3 of a vulcanizer 4 and both faces of an unvulcanized belt molded body, and the sheet-like intermediate materials 5 and 6 are exfoliated from the conveyer belt 1 after vulcanization. The sheet-like intermediate materials 5 and 6 are formed of a resin having a low friction coefficient including a core sheet formed of woven fabric or knitted fabric.

Description

  The present invention relates to a conveyor belt manufacturing method for manufacturing a conveyor belt by heating and pressurizing (vulcanizing) an unvulcanized belt molded body, and a conveyor belt.

  Conventionally, the vulcanization step in the production process of a conveyor belt has the purpose of forming it into a predetermined size and appearance by a hot platen (mold) in addition to obtaining the desired physical properties of rubber. Conveyor belts are usually made by forming unvulcanized belt moldings by laminating unvulcanized rubber sheets on both the front and back sides of a core layer made of canvas or steel cord. It is manufactured by vulcanization by a method called feed firing by a vulcanizer. That is, an unvulcanized belt molded body is charged in a heating plate of a vulcanizer, pressed for a certain time, vulcanized by applying heat and pressure, and the vulcanized conveyor belt is removed from the vulcanizer. At the same time, the unvulcanized belt molded body that follows is inserted into a vulcanizer, charged into a hot platen, and vulcanized and removed. By repeating this operation, the unvulcanized belt molding is sequentially vulcanized to produce a single conveyor belt. Such feed baking is performed because of the size relationship between the conveyor belt (product) and the hot platen.

  However, in the vulcanization process, when an unvulcanized belt molded product is charged into the hot platen, if the unvulcanized belt molded product touches the hot platen, it will stick to the hot platen and it will be difficult to adjust the positioning. In some cases, charging may not be possible, and it may be difficult to remove the mold after vulcanization.

  Therefore, a non-woven fabric layer is provided on the surface of the unvulcanized belt molded body, or a mold release agent such as talc or silicon or a release agent such as silicon is applied to the surface of the unvulcanized belt molded body or the surface of the hot platen. This prevents sticking during charging and makes it easier to remove and release from the vulcanizer hot plate after vulcanization. In addition, a non-woven fabric or talc layer is formed between the unvulcanized belt molded body and the hot platen so that air or gas generated during vulcanization can be discharged out of the hot plate through this layer. Therefore, there is also an effect of suppressing the occurrence of defects in which depressions (hereinafter referred to as “bears” in this specification) are formed on the surface of the conveyor belt formed by residual air or residual gas (see, for example, Patent Document 1).

Japanese Patent No. 3833083 (pages 2 to 3, FIG. 1)

  These conventional techniques have at least the following problems.

  (i) In the method of applying powder, dust scattering occurs in the manufacturing process, which adversely affects the work environment.

  (ii) A part of talc and silicon remains in the mold during demolding and mold release, and accumulates as dirt on the mold surface by repeated feeding and firing, so it is necessary to remove it.

  (iii) Since the surface of the hot platen is not uniform due to the above-mentioned dirt, the product surface is not smooth, the escape of gas is worsened, and so-called “bearing” increases. Therefore, more talc and silicon will be applied, resulting in a vicious circle.

  (iv) Dirt on the hot plate is transferred to the product surface and deteriorates the product appearance. This cannot be improved by using a nonwoven fabric.

  (v) Non-woven fabric or the like falls off when the belt is running, and foreign matter is mixed into the conveyed product.

  By the way, it is conceivable to apply a release agent to the hot platen, but it is difficult to apply it uniformly. Even if it can be applied to a hot platen, the coating peels off as it is used, and it becomes necessary to re-coat, resulting in inferior durability, man-hours, and high costs.

  An object of the present invention is to improve the working environment and to produce a conveyor belt having a uniform appearance over a long period of time without contaminating the mold of the vulcanizer.

  The invention according to claim 1 is a method for manufacturing a conveyor belt, in which an unvulcanized belt molded body is vulcanized by pressing with a set of hot plates to form a conveyor belt, the unvulcanized belt molded body Between the front and back surfaces and the hot platen, a step of pressing in a state where a sheet-like intermediate material is interposed, and a step of peeling the sheet-like intermediate material from a vulcanized conveyor belt, The sheet-like intermediate material is composed of a low-friction coefficient resin including a core sheet made of woven fabric or knitted fabric. Here, “consisting of a low coefficient of friction resin including a core sheet made of woven fabric or knitted fabric” means that all the surfaces of the sheet-like intermediate material that come into contact with the unvulcanized belt molded body are low friction coefficient resins. Of course, the case where a part of the core sheet is exposed is included.

  In this way, at the time of vulcanization, the belt molded body is not in direct contact with the hot platen, but by interposing the sheet-like intermediate material between the hot platen and the belt molded body, it becomes easy for gas to escape, So-called “bears” are reduced. The sheet-like intermediate material is composed of a low-friction coefficient resin including a core sheet made of woven fabric or knitted fabric, and the side of the sheet-like intermediate material that comes into contact with the unvulcanized belt molded body is mainly low-friction. Since it is composed of a coefficient resin and is easily separated from the belt surface, it is considered that gas escapes to the side through them.

  Further, since the sheet-like intermediate material exists between the unvulcanized belt molded body and the hot platen, scratches and dirt on the hot platen are not transferred to the belt, and the belt appearance becomes very good. That is, by transferring the surface property of the sheet-like intermediate material, it can be finished as a smooth belt surface, and an excellent appearance can be obtained.

  Furthermore, since the sheet-like intermediate material is composed of a low friction coefficient resin including a core sheet made of a woven fabric or a knitted fabric, it is more durable than the case of using the woven fabric or the knitted fabric as it is, and is advantageous for repeated use. Become. In addition, since the sheet-like intermediate material does not change, the quality of the conveyor belt that maintains an excellent appearance on the smooth belt surface is maintained even when used repeatedly.

  After the vulcanization is completed, the sheet-like intermediate material is peeled off from the conveyor belt, so that the sheet-like intermediate material does not remain on the belt surface. Therefore, like the one described in Patent Document 1 using a nonwoven fabric, a part of the woven fabric or knitted fabric (sheet-like intermediate material) is exposed from the cover rubber, causing unevenness on the belt surface, or a part of the woven fabric or knitted fabric falls off. There is no danger of doing it.

  And since the sheet-like intermediate material is pressed in a state of being interposed between the unvulcanized belt molded body and the hot platen, the releasability and formation of the unvulcanized belt molded body and the hot platen are formed. The releasability of the conveyor belt and the hot plate is improved. In particular, because the sheet-like intermediate material is composed of a low-friction coefficient resin including a core sheet made of woven fabric or knitted fabric, the above-mentioned mold release is used rather than using the woven fabric or knitted fabric as the sheet-shaped intermediate material as it is. Excellent in properties. This eliminates the need for dusting and the like, and eliminates the presence of dusting and the like that has been a problem in the past, so that the surface of the hot platen is not soiled and the surface of the hot platen can be kept in a uniform state. As a result, cleaning for removing dirt on the surface of the hot platen due to staying is unnecessary. Therefore, productivity is improved and the hot platen is not polished during cleaning, and the smoothness of the hot plate can be maintained.

  In this case, as described in claim 2, the core sheet is a fabric made of glass fiber or aramid fiber, or a fabric made by mixing these fibers, and the low friction coefficient resin is a fluororesin (for example, 4 (Ethylene fluoride resin).

  In this way, the glass fiber or the aramid fiber constituting the core sheet of the sheet-like intermediate material is excellent in strength, so that it is difficult to wrinkle and is advantageous for repeated use.

  Further, as described in claim 3, the core sheet is a woven fabric made of any of natural fibers, chemical fibers, and metal fibers, or a woven fabric obtained by mixing these fibers, and the low friction coefficient resin is: It can also be a silicon resin. Here, natural fibers, chemical fibers, and metal fibers, which are materials of the sheet-like intermediate material, naturally have heat resistance with respect to the vulcanization temperature. For example, as natural fiber, cotton fiber, hemp fiber, rayon fiber, as chemical fiber, nylon fiber, polyester fiber, polypropylene fiber, aramid fiber, glass fiber, vinylon fiber, as metal fiber, stainless fiber, copper fiber, Titanium fiber and aluminum fiber are used.

  According to a fourth aspect of the present invention, the woven fabric that is the core sheet of the sheet-like intermediate material can be a plain woven fabric, a diagonal woven fabric, or a satin woven fabric. That is, in the case of a woven fabric, monofilaments and multifilaments made of the above-described fibers can be produced by weaving with a weaving method such as plain weave, oblique weave, and satin weave.

  In this way, by using plain weave, oblique pattern weave, and satin weave, workability can be improved and cost can be reduced.

  The invention of claim 5 is manufactured by the manufacturing method of any one of claims 1 to 4.

  In this case, after the vulcanization, the surface property of the sheet-like intermediate material is transferred to the belt surface by removing the sheet-like intermediate material, so that an excellent appearance is provided. In addition, since it has an excellent appearance, in addition to eliminating the need for repairs, even if a powdery material such as cement is conveyed, the presence of the powdery material is greatly reduced.

  As described above, the present invention can improve the working environment because a sheet-like intermediate material is interposed between the hot platen and the belt molded body instead of talc or the like during vulcanization. Since it can be used repeatedly, it is advantageous in terms of cost. It is easy to peel off the sheet-like intermediate material, and it is not necessary to remove mold contamination.

  In addition, it is possible to manufacture a conveyor belt having a uniform appearance and shape that cannot be realized by conventional methods using dust such as talc or non-woven fabric.

It is a schematic block diagram which shows the form of the vulcanization | cure process in the manufacture process of the conveyor belt which concerns on this invention. (A)-(c) is a figure which shows the state of the back-through of the rubber | gum about a sheet-like intermediate material after a press, a back-through large, during back-through, and back-through small, respectively. It is a schematic block diagram which shows the form of the other vulcanization process in the manufacture process of the conveyor belt which concerns on this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a simplified vulcanization process in the manufacturing process of a conveyor belt. Reference numeral 1 is a conveyor belt, reference numerals 2 and 3 are hot plates of a vulcanizer 4, reference numerals 5 and 6 are sheet-like intermediate materials. Reference numerals 7 and 8 denote a feeding device and a winding device for the sheet-like intermediate members 5 and 6, and reference numeral 9 denotes a winding drum of the formed conveyor belt.

  The conveyor belt includes a core body layer on which a core body canvas (or steel cord) is disposed, and a cover rubber layer that is laminated on both front and back surfaces of the core body layer. For the canvas of the core layer, polyester fiber, nylon fiber, aramid fiber, cellulose fiber, cotton fiber, canvas mixed with these, and the like are used. The rubber material for the cover rubber layer includes natural rubber, BR (polybutadiene rubber), SBR (styrene-butadiene rubber), NBR (acrylonitrile-butadiene rubber), EPDM (ethylene-propylene-diene rubber), and mixed materials thereof. Etc. are used. The cover rubber layer may be provided with a reinforcing layer provided with a reinforcing canvas for increasing belt rigidity or preventing tearing.

Then, the manufacturing method of a conveyor belt is demonstrated.
(Manufacture of unvulcanized belt moldings)
The belt-like canvas wound in a roll shape is applied or infiltrated with rubber for adhesion while being sequentially pulled out from the end, or subjected to RFL (resorcin / formalin / latex) treatment, and then rewound into a roll shape again.

Thus, an unvulcanized belt molded body is formed using the canvas subjected to the treatment for improving the adhesiveness as a core body. Specifically, while pulling out the canvas from the roll, laminate unvulcanized rubber sheets on both sides of the canvas, attach unvulcanized ear rubber material to both ends in the width direction, and cut off the excess part of both ears Thus, an unvulcanized belt molding having a predetermined width and thickness is obtained. The unvulcanized belt molded body formed in this way is sequentially wound around a drum.
(Vulcanization)
A vulcanized machine 4 shown in FIG. 1 is charged with an unvulcanized belt molded body between upper and lower heating plates 2 and 3 and vulcanized by applying heat and pressure for a certain period of time. A conveyor belt 1 having a width and thickness is formed. For example, vulcanization is performed at a surface pressure of 20 kg / cm ² at a temperature of 150 ° C. to 160 ° C. for 15 minutes to 20 minutes. The unvulcanized belt molded body is a portion inserted into the vulcanizer 4 from the left side in FIG.

  More specifically, the unvulcanized belt molded body wound around the drum is sequentially pulled out from the end, and on both the front and back surfaces, that is, the front and back surfaces (conveying surface / non-conveying surface) of the conveyor belt 1 to be formed. Sheet-like intermediate materials 5 and 6 are laminated on each corresponding surface. These sheet-like intermediate members 5 and 6 are made of a glass fiber plain weave fabric (so-called taffeta) as a core sheet, coated with a fluororesin (for example, tetrafluoroethylene resin), and an unvulcanized belt molded body or The surface to which the conveyor belt 1 after vulcanization comes into contact is a coating surface made of fluororesin. Here, “plain weave” refers to a structure in which each weft yarn passes alternately above and below one warp yarn, and the warp yarn passes alternately above and below one weft yarn (JIS L 0206: 1999 term number 2001). . `` Taffeta '' means (i) a dense and dense plain woven fabric that uses warp and warp yarns, a weft yarn and one piece of kneading yarn, or (ii) no or sweeter chemical fiber filament yarn. This is a slightly dense plain fabric with a low density (JIS L 0206: 1999 term number 1253).

  An unvulcanized belt molded body in which the sheet-like intermediate materials 5 and 6 are laminated on top and bottom is inserted into the vulcanizer 4 and charged between the upper and lower heating plates 2 and 3. At this time, since the unvulcanized belt molded body and the heating plates 2 and 3 are not adhered to each other by the sheet-like intermediate materials 5 and 6, the operation is easy and adjustments such as positioning can be easily performed.

  After charging, pressing is performed for a certain period of time, and vulcanization is performed by applying heat and pressure to the unvulcanized belt molded body. During vulcanization, air existing between the unvulcanized belt molded body and the heating plates 2 and 3 or gas generated during vulcanization is caused by the sheet-like intermediate materials 5 and 6 and the unvulcanized belt molded body. Since the belt is pushed out to both sides of the belt and discharged, the formed conveyor belt is less prone to defects caused by so-called “bearing”. Since the front and back surfaces of the unvulcanized belt molded body are in contact with the low friction coefficient resin coating surfaces of the sheet-like intermediate materials 5, 6, the adhesion to the sheet-like intermediate materials 5, 6 is weak, and the air Etc. are easily discharged.

  After the vulcanization is completed, the formed conveyor belt 1 is demolded, sent in the direction opposite to the direction in which the unvulcanized belt molded body is inserted, taken out from the vulcanizer 4, and the subsequent unvulcanized belt molding. The body is inserted into the vulcanizer 4 by the length of the hot plate in a state where the intermediate sheet materials 5 and 6 are laminated, and charged between the hot plates 2 and 3. When the formed conveyor belt 1 is demolded, it can be easily detached from the hot plates 2 and 3 by the releasability of the sheet-like intermediate materials 5 and 6. On the other hand, when the next unvulcanized belt molded body is charged, sufficient heat and pressure are applied to the unvulcanized belt molded body at the longitudinal ends of the hot plates 2 and 3. Since it cannot be added and vulcanization becomes incomplete, in order to re-vulcanize this portion, the portion where the vulcanization is incomplete is placed in the hot plates 2 and 3.

  The conveyor belt 1 removed from the vulcanizer after demolding is peeled while winding the fabrics 5 and 6 on the front and back sides while the temperature is not lowered by the winding device 8 and is wound around the winding drum 9 sequentially. In this way, a single conveyor belt 1 is manufactured by vulcanizing an unvulcanized belt molded body approximately every heating plate length.

  As in the conveyor belt manufacturing method described above, the sheet-like intermediate members 5 and 6 are interposed between the unvulcanized belt molded body and the heating plates 2 and 3 to facilitate preparation and demolding. For this reason, a dusting agent such as talc or a release agent such as silicon is not necessary, and the dusting agent or the release agent is scattered, thereby deteriorating the working environment at the manufacturing site. Thereby, contamination of the hot platen surface due to these arrivals can be avoided. In addition, even if the belt material penetrates through the sheet-like intermediate material during vulcanization, it is coated with a low friction coefficient resin, so it has good releasability and easily removes the rubber that has penetrated. You can also

  As a result, it has conventionally been necessary to perform hot plate cleaning, which requires 5 to 10 hours per time, three to four times a month. However, since this is unnecessary, significant improvement in production efficiency can be achieved. Further, even if dirt is present on the surface of the hot platen, the formed conveyor belt 1 is protected by the sheet-like intermediate materials 5 and 6, so that the dirt is not transferred to the belt surface.

  In addition, since the coated woven fabric or knitted fabric is used as the sheet-like intermediate materials 5 and 6, it is more durable than the woven fabric or knitted fabric as it is, and can be used repeatedly. In addition, the quality of the manufactured conveyor belt is stable.

  The formed conveyor belt 1 has almost no defects such as so-called “bear” on the conveying surface and the non-conveying surface, and the surface properties of the sheet-like intermediate materials 5 and 6 are uniformly transferred so that the belt surface is uniform. Since it is a smooth surface, it looks good and looks excellent. In addition, since the drainage performance of the transport surface and the non-transport surface is improved, water droplets and the like are easily swept between the pulley and the roller even in a high humidity environment such as rainy weather, and slip does not easily occur. Further, it is possible to suppress meandering during traveling and generation of abnormal noise when passing through pulleys, rollers, and the like.

  Further, since the transport surface and the non-transport surface have uniform surface properties, cracks due to bending deformation that occur when passing through a pulley or the like are unlikely to occur. And even if it is a case where powdery objects, such as cement, are conveyed, it can scrape off to the grade which does not require cleaning, and the contamination of the conveyor belt by the increase in the amount of living can be avoided. Therefore, the conveyor belt 1 has both running stability and durability capable of performing stable conveyance over a long period of time.

Next, evaluation tests for the amount of living, wrinkles, and back-through will be described. In addition, in order to confirm that the evaluation test can be repeatedly used, 15 presses were repeatedly performed using the same sheet-like intermediate material for each of the examples and the comparative examples in a test press. Check the sheet after pressing 15 times, whether or not it can be used repeatedly, from the viewpoints of (i) the amount of sitting, (ii) generation of wrinkles, (iii) slipping through rubber, and (iv) generation of bears The results are shown in Table 1.
(i) Residential Amount The manufactured conveyor belt was tested for the cement abundance when cement (powder) was conveyed. Here, the amount of presence is evaluated because if the amount of residence is large, the contamination of the conveyor belt increases with use, which causes the appearance of the belt to be impaired.
-Evaluation method-
A test piece (a vulcanized conveyor belt cut into a size of 75 mm × 75 mm) was attached to a running conveyor belt of a running test machine with double-sided tape, and the test piece was run with an appropriate amount of cement. The scraper was operated and rotated 5 or more times, and the change in the weight of the test piece was measured.
-Sample-
Examples 1 to 4, 6 to 17 and Comparative Examples 1 to 6 were vulcanized and molded using a core sheet made of a plain fabric of glass fibers as a sheet-like intermediate material, Examples 5 and 18 are obtained by vulcanization molding using a core sheet made of a plain fabric of aramid fibers as a sheet-like intermediate material and coated with a fluororesin. Specifically, as the sheet-like intermediate materials of Examples 1 to 18 and Comparative Examples 1 to 6, commercially available Teflon sheets having the above-described configuration were used. The sheet thickness and the Teflon coat film thickness of the sheet-like intermediate material were measured by confirming the cross-section of the sheet-like intermediate material with a microscope (Keyence Corporation digital microscope (VHX-600)). Note that the magnification is 450 times (the magnification can be varied up to 3000 times). The minimum thickness and the maximum thickness of the sheet-like intermediate material are measured, and the average value (average thickness) is defined as the sheet thickness.
(ii) Wrinkle generation The reason for evaluating the generation of wrinkles is that if wrinkles are transferred to the surface of the conveyor belt, the amount of presence increases and the appearance tends to be damaged.

  If wrinkles transferred to the rubber surface of the conveyor belt occur in the sheet-like intermediate material, the wrinkles are always transferred to the belt side during the next press, and it is considered impossible to reuse. When such wrinkles occur, the wrinkle determination is x.

If there is no wrinkle in the sheet-like intermediate material, or even if wrinkles enter the sheet-like intermediate material and the wrinkle is not transferred to the rubber surface, it is considered reusable. ○.
(iii) Rubber back-through If the back-through of the rubber becomes large for the sheet-like intermediate material, it will be inferior in releasability when the sheet-like intermediate material is peeled off from the vulcanization mold after vulcanization. Since the mold needs to be cleaned, there is an advantage that even if the number of presses is increased, if there is only a small amount of rubber penetration, there is no need to clean the vulcanization mold. Therefore,
As an evaluation, if the rubber back-through area exceeds 50% per unit area, it is considered that the rubber back-through is large and the mold needs to be cleaned frequently, and the determination is x. When the rubber back-through area is 50% to 10% per unit area, it is considered that it is sometimes necessary to clean the mold during the rubber back-through, and the determination is Δ. When the rubber back-through area is 10% or less per unit area, it is considered that the rubber back-through is small and the mold cleaning is hardly necessary, and the determination is “good”.
(iv) Occurrence of bears The occurrence of bears is evaluated because when bears occur on the surface of the conveyor belt, the amount of living increases and the appearance is impaired. Further, the environment is deteriorated, for example, dust scattering during conveyance of the conveyor belt is increased, and adhesion to peripheral equipment such as a support roller and a frame is facilitated.

When no bear is generated, the determination is “good”. When the generated bear has a diameter of 2 mm or more or a depth of 0.5 mm or more, the determination is x. When the diameter is less than 2 mm and the depth is less than 0.5 mm, the determination is Δ.
-Test results-
The following are shown in Tables 1 and 2. In addition, as for the back-through of the rubber, FIGS. 2 (a) and 2 (b) (for Comparative Example 5 when the back-through is large, Comparative Example 6 when the back-through is in progress and Example 14 when the back-through is small, c).

From Tables 1 and 2, it can be seen that for Examples 1 to 18, all of the press amount is small, there is little amount of wrinkles, wrinkles are not generated, and there is almost no occurrence of rubber back-through and bear. . Therefore, it can be said that the quality of the manufactured conveyor belt is maintained even if the vulcanization press is repeated using the same sheet-like intermediate material.

  Moreover, about Example 3, 4, the evaluation sheet of 150 mm x 150 mm was created, and it used repeatedly for the vulcanization molding of the rubber sheet of thickness 2.2mm with a test press, and when durability was confirmed, it repeated 100 times. There was no problem using it. Therefore, it is presumed that there is no problem even if the example is repeatedly used 100 times in other examples. The test conditions were vulcanization temperature: 150 ° C., vulcanization time: 20 minutes, and vulcanization pressure: surface pressure of 20 kg / cm 2 according to ASTM test standards.

  In addition to the above, the present invention can be implemented with the following modifications.

(i) In the above embodiment, the sheet-like intermediate material is sequentially fed out and peeled off after vulcanization, but the present invention is not limited thereto, and during vulcanization, a hot platen and a belt molded body are used. It is sufficient if there is a sheet-like intermediate material between the two, and since it can be used repeatedly as described above, the sheet-like intermediate materials 5 ′ and 6 ′ are fixed to the heating plates 2 and 3 of the vulcanizer 4 as shown in FIG. It is also possible to do. In this case, it is desirable to fix in a state where a certain tension is applied.

  In this way, it is not necessary to peel off the sheet-like intermediate materials 5 'and 6' after vulcanization, so that productivity is improved.

  (ii) In the above-described embodiment, a glass fiber plain weave fabric coated with a fluororesin is used as the core material of the sheet-like intermediate material. However, the present invention is not limited to this, for example natural It is also possible to use a woven fabric or knitted fabric made of any one of fibers, chemical fibers and metal fibers, or a plain woven fabric or knitted fabric in which these fibers are mixed and coated with a silicon resin which is a low friction coefficient resin. Similarly, it has been confirmed that it has durability and can be used repeatedly. Since silicon resin has a lower melting point than fluororesin, the range of woven fabrics or knitted fabrics that can be used as a core sheet is widened, and the degree of freedom in material selection is increased.

  (iii) In addition to plain weave, it is also possible to use a fabric obtained by coating a fabric woven with a weave method such as a twill weave or a satin weave with a low friction coefficient resin. “Slanted pattern weave” refers to a structure having a complete structure composed of at least three weft yarns and forming an oblique line (JIS L 0206: 1999 term number 2002). “Vermilion weave” is a complete structure including at least 5 warp yarns and weft yarns, in which the same warp yarn intersects with the weft yarn only once and the number of weft yarn jumps is 1 or more ( JIS L 0206: 1999 term number 2003).

  (iv) The above embodiment is applied to a conveyor belt, but it goes without saying that it can also be applied to a roofing sheet (waterproof sheet) and a flooring material.

1 Conveyor belts 2, 3 Heating plates 5, 5 ', 6, 6'

Claims (5)

A method of manufacturing a conveyor belt, which is vulcanized by pressing an unvulcanized belt molded body with a set of hot plates to form a conveyor belt,
A step of pressing in a state where a sheet-like intermediate material is interposed between the front and back surfaces of the unvulcanized belt molded body and the hot platen, and the sheet-like intermediate material is peeled off from the vulcanized conveyor belt. And having a process,
The method for manufacturing a conveyor belt, wherein the sheet-like intermediate material is made of a low friction coefficient resin including a core sheet made of woven fabric or knitted fabric.
The core sheet is a woven fabric made of glass fiber or aramid fiber, or a woven fabric obtained by mixing these fibers.
2. The method of manufacturing a conveyor belt according to claim 1, wherein the low friction coefficient resin is a fluororesin.
The core sheet is a woven fabric made of any of natural fibers, chemical fibers, and metal fibers, or a woven fabric obtained by mixing these fibers.
2. The method of manufacturing a conveyor belt according to claim 1, wherein the low friction coefficient resin is a silicon resin.
The method for manufacturing a conveyor belt according to any one of claims 1 to 3, wherein the woven fabric that is the core sheet is a plain woven fabric, an oblique woven fabric, or a satin woven fabric.
  A conveyor belt manufactured by the manufacturing method according to claim 1.