JP4063934B2 - Belt vulcanization method and belt sleeve manufacturing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a belt vulcanizing method and a belt sleeve manufacturing method, and more specifically, a belt sleeve that can vulcanize a belt sleeve such as a V-ribbed belt or a toothed belt without using air bubbles without using a jacket. The present invention relates to a vulcanization method and a belt sleeve manufacturing method.
[0002]
[Prior art]
In the conventional belt vulcanizing method, as an example, an adhesive rubber layer is interposed between the compression rubber layer and the stretch rubber layer on the outer peripheral surface of the mold, and the core wire is laminated so as to be embedded in the adhesive rubber layer. A cylindrical jacket that can be elastically deformed is fitted concentrically on the outer side of the belt sleeve for vulcanization, and the assembly assembled in the above form is placed on a support base located below in the vulcanization can via an elastic packing material. The uncovered belt sleeve was vulcanized by placing an upper lid on the mold, press-fitting high-pressure steam outside the mold and low-pressure steam inside the drum, respectively.
[0003]
In the belt vulcanization method described above, the high pressure steam outside the jacket presses the jacket, and then presses the unvulcanized belt sleeve, thereby discharging air existing in the gap between the jacket and the mold and a predetermined shape. The rubber sleeve was molded and solidified to be dense without containing bubbles to obtain a high-quality belt sleeve.
[0004]
As a manufacturing method of the jacket, an unvulcanized rubber layer having a predetermined thickness is wound around a normal mold to form a molded body, and the molded body is made of unvulcanized rubber extending outward at at least one end edge of the molded body. After attaching the flange portion, another cylindrical jacket is fitted, and this is placed in a vulcanizing can and vulcanized, and then the molded body can be extracted from the mold.
[0005]
[Problems to be solved by the invention]
However, in the conventional belt vulcanization method, it is necessary to prepare a plurality of rubber jackets for various belt sizes and store them constantly, and occupies a large area in the factory. Further, when a special size belt is manufactured, since the jacket is not frequently used, the appearance is visually inspected every time it is used.
[0006]
Moreover, even those of any size flowed from the previous step in any order, excised jacket corresponding thereto in a short time, it is necessary to work interpolating fitted a jacket unvulcanized belt sleeve, but In reality, loss of changeover time including order restrictions and rearrangement has occurred with the introduction and replacement of various jackets of different sizes.
[0007]
Furthermore, in order to prevent so-called steam leakage, in which steam enters the unvulcanized belt sleeve from the jacket, it is necessary to manage the jacket. For example, after a long period of use, it is necessary to constantly check the aging surface condition of the flanges and inner surfaces of the jacket, the presence or absence of dust adhering to both flanges of the jacket, and changes in the jacket length and circumference. It was. If neglected, steam leakage occurred and the defective belt sleeve containing bubbles was vulcanized.
In addition, when the jacket is replaced, sufficient residual heat is generated in the vulcanizing can before use, and the length and circumference of the jacket are expanded to fit into the unvulcanized belt sleeve. It was necessary to secure appropriate dimensions that were easy to use.
[0008]
The present invention improves various problems when such a jacket is used, enables a production line to be installed in a small space, reduces loss of working time, and vulcanizes at low cost. It is an object of the present invention to provide a jacketless belt vulcanization method and a belt sleeve manufacturing method that can obtain a belt sleeve of good quality that eliminates vapor leakage and does not contain bubbles.
[0009]
[Means for Solving the Problems]
That is, in the invention according to claim 1 of the present application, in a belt vulcanizing method in which an unvulcanized belt sleeve made of at least a rubber layer is attached to a mold and vulcanized, at least molded by a film body that does not transmit vapor. The outer periphery of the unvulcanized belt sleeve mounted on the mold is surrounded, and the sealing material is mounted on a film body that does not transmit vapor on the upper and lower corners of the unvulcanized belt sleeve, and then the mold is There is a vulcanization method for a belt that is installed in a vulcanizing can and vulcanizes without vapor entering the membrane body. The membrane body that does not allow vapor to penetrate surrounds the outer surface of the unvulcanized belt sleeve and vulcanizes. By preventing the invasion of steam during vulcanization, it can be vulcanized without using a jacket, suitable for a small space production line, reducing work time loss, and vulcanizing at low cost. In the way .
[0010]
In the invention according to claim 2 of the present application, a synthetic resin film is used as a film body that does not transmit vapor, and the surrounding work is facilitated by winding it around the outer peripheral surface of an unvulcanized belt sleeve.
[0011]
[0012]
[0013]
In the invention according to claim 3 of the present application, since the sealing material is a fiber material selected from at least one layer of canvas with rubber and non-woven fabric, the sealing effect of the upper and lower corner portions is enhanced.
[0014]
In the invention according to claim 4 of the present application, in a belt vulcanizing method in which an unvulcanized belt sleeve made of at least a rubber layer is attached to a molding die and vulcanized, the synthetic resin film is replaced with an unvulcanized belt sleeve. Wrapped over a part of both sides of the mold together with the outer peripheral surface of the mold, and after further mounting the sealing material on the synthetic resin film surrounding the upper and lower corners of the unvulcanized belt sleeve, the mold is vulcanized This is a method of vulcanizing a belt that is installed in a can and vulcanizes in a state where steam does not enter the inside of the film body. The synthetic resin film is used to surround the outer peripheral surface and upper and lower corners of an unvulcanized belt sleeve. Furthermore, the upper and lower corners can be sealed more reliably with a sealing material, and the work is easy, suitable for a small space production line, reducing work time loss and low cost. In a way that can be vulcanized.
[0015]
In the invention according to claim 5 of the present application, in the method for producing a belt sleeve by molding a belt sleeve for a power transmission belt comprising at least a rubber layer and a core wire on the outer peripheral surface of the mold, and then vulcanizing the belt sleeve. A film body that is surrounded by a film body that does not allow vapor to pass over both the outer peripheral surface of the belt sleeve and part of both side surfaces of the mold, and a sealing material is provided at the upper and lower corners of the unvulcanized belt sleeve. This is a belt sleeve manufacturing method in which a molding die is placed in a vulcanizing can after being mounted on , vulcanized in a state where steam does not enter the inside of the film body, and the film body is removed after vulcanization. It can be vulcanized without using bubbles without being used, and can be used as a belt sleeve such as a V-ribbed belt or a toothed belt.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
The belt vulcanizing method of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 shows a view for producing an unvulcanized belt sleeve constituting a compressed rubber layer, a core wire, and an extended rubber layer on a mold. First, the molding die 1 is installed in a molding machine (not shown), and an unvulcanized rubber sheet 3 and an adhesive rubber layer are formed on the outer peripheral surface of the drum 1 as one or several reinforcing cloths 2 and an extended rubber layer. An unvulcanized rubber sheet 4 is wound, and a core wire 5 made of a cord such as polyester fiber, aramid fiber, or glass fiber is spun from above, and then an unvulcanized rubber sheet 6 that becomes a compressed rubber layer is wound. This forming method is generally called a reverse molding method because the compressed rubber layer is located outside.
[0017]
The rubbers of the unvulcanized rubber sheets 3 and 6 which become the stretch rubber layer and the compression rubber layer are natural rubber, butyl rubber, styrene-butadiene rubber, chloroprene rubber, ethylene-propylene rubber, alkylated chlorosulfanated polyethylene, hydrogenated For example, para-aramid fiber (trade name: Twaron, Kevlar, Technora), nylon, polyester, or rubber materials such as nitrile rubber, mixed polymer of hydrogenated nitrile rubber and unsaturated carboxylic acid metal salt, or a mixture thereof. In addition, short fibers such as vinylon and cotton are oriented in the belt width direction. The addition amount of this short fiber is 5-40 weight part with respect to 100 weight part of rubber | gum.
The adhesive rubber layer may include the short fibers, but preferably does not include them.
[0018]
The reinforcing cloth 2 is made of cotton, polyester fiber, nylon, or the like, and is a cloth woven into plain weave, twill weave, satin weave, or the like, and may be a wide angle canvas in which the crossing angle between the warp and the weft is about 90 to 120 °. The reinforcing cloth 2 is subjected to RFL treatment, and then the rubber composition is subjected to fiction and coating to form a canvas with rubber. The RFL liquid is a mixture of an initial condensate of resorcin and formalin mixed with latex. Examples of the latex used here include chloroprene, styrene / butadiene / vinylpyridine terpolymer, hydrogenated nitrile, NBR, and the like.
[0019]
FIG. 2 shows that the outer peripheral surface 9 of the unvulcanized belt sleeve 7 produced on the mold 1 is being surrounded by a film body 8 that does not allow vapor to pass therethrough. According to this, the film body 8 that does not transmit vapor is spirally wound across both the outer peripheral surface 9 of the unvulcanized belt sleeve 7 of the mold 1 taken out from the molding machine and part of both side surfaces 10 of the mold 1. . At this time, it is necessary to overlap the end portions of the film body 8 so that the unvulcanized belt sleeve 7 is not exposed. Of course, the film body 8 may be used by overlapping several plies, preferably 2 to 4 plies.
The film body 8 may have a wide width, and in this case, it is not necessary to wind the film body in a spiral shape.
[0020]
Unvulcanized belt sleeve 7 which is surrounded by the membrane body 8 is not just the outer peripheral surface 9 as shown in FIG. 3, and across a portion of both side surfaces 10 of the mold, the corner portions of the mold 1 12 is surrounded to prevent intrusion of steam during vulcanization.
[0021]
The film body 8 that does not transmit vapor is preferably a synthetic resin film. For example, polymethylpentene, polyvinylidene chloride, polyvinyl chloride, polyethylene, polypropylene, 6 nylon, 6.6 nylon, 6.10 nylon, etc. Made of polyamide, aramid and polyester. Among these, the registered trademark “Saran Wrap”, which is made of a synthetic resin film made of polymethylpentene or polyvinylidene chloride, easily surrounds the unvulcanized belt sleeve 7 and has a small thermal shrinkage during vulcanization. Thus, it can be used safely without being peeled off from the belt sleeve 7 and without generation of toxic gas during vulcanization.
The thickness of the film body 8 is not particularly limited, but a thinner one is preferable for the winding operation.
[0022]
The mold 1 equipped with the unvulcanized belt sleeve 7 surrounded by the film body 8 is installed in the vulcanizing device 15 as shown in FIG. In this vulcanizing device 15, a molding die 1 equipped with an unvulcanized belt sleeve 7 surrounded by a film body 8 is placed on a support assembly table 17 positioned below in a vulcanizing can 16, and further a molding die. An upper lid 18 is placed on the mold 1, and high pressure steam is press-fitted on the outside of the mold 1 and low-pressure steam is press-fitted inside the mold 1 to vulcanize the unvulcanized belt sleeve 1. Both the high-pressure steam and the low-pressure steam are introduced from the introduction port 19, and the internal moisture is discharged from the drain port 20.
In order to prevent low-pressure steam press-fitted into the mold 1 from entering the side where the unvulcanized belt sleeve 7 exists from the gap between the mold 1 and the support assembly 17, A rubber packing (not shown) may be attached. Further, during the vulcanization, the air existing between the mold 1 and the film body 8 and the air present between the upper lid 18 and the mold 1 are discharged from the upper lid 18 to the vulcanizer 15. It is also possible to provide a pipe (not shown) that leads to the outside.
Although the vulcanization conditions are not particularly limited, the vulcanization temperature is adjusted to a temperature at which the film body 8 does not melt. Specifically, 140 to 160 ° C. is preferable.
[0023]
FIG. 4 shows a case where a sealing material 22 is provided in the upper and lower corner parts 12 on the enclosed film body 8 in order to further surround the corner parts 12 of the mold 1. As a result, the upper and lower corner portions 12 of the mold 1 can be reliably sealed. This sealing material 22 is made of polyamide fibers such as 6 nylon, 6/6 nylon, 6/10 nylon, 4/6 nylon, 12 nylon, etc., polyester fibers, filament yarns of polyvinyl alcohol, polyethylene, polypropylene, and spun yarns such as cotton. The canvas is impregnated with rubber, and preferably 1 to 4 ply laminated. Moreover, a nonwoven fabric may be sufficient.
[0024]
When vulcanization is completed, the film body 8 can be easily peeled off from the surface of the mold 1 taken out from the vulcanization can 16. The film body 8 is scrapped. The surface of the belt sleeve 7 extracted from the mold 1 is vulcanized and roughened with the sheet surface immediately after molding as compared with the case where a jacket is used, but there is no occurrence of porous material and the like. Sulfur.
When finishing the belt sleeve 7 into, for example, a V-ribbed belt, the sleeve 7 is hung on a driving roll and a driven roll and travels under a predetermined tension, and the compressed rubber layer on the surface is polished by a polishing wheel. Since the rib crest and the rib trough are formed, the surface shape of the belt sleeve 7 is not affected.
Of course, in the present invention, besides the V-ribbed belt, it can be vulcanized as a belt sleeve for a toothed belt.
[0025]
【Example】
Examples of the present invention will be described below.
Example 1
As a core wire, 1,100 denier polyethylene terephthalate fiber is twisted in the up and down direction with an upper twist number of 11.4 times / 10 cm and a lower twist number of 21.0 times / 10 cm to form a 2 × 3 twist structure, total denier 6,600 raw codes were prepared. Next, this untreated cord was pre-dipped with an isocyanate-based adhesive, then dried at about 170 to 180 ° C., immersed in an RFL solution, and then subjected to a stretching and heat setting treatment at 200 to 240 ° C. to obtain a treated cord. .
[0026]
In addition, a plain woven canvas using cotton spun yarn was used as the reinforcing fabric. These canvases were immersed in an RFL solution and then heat treated at 150 ° C. for 2 minutes to obtain treated canvases. Thereafter, a rubber composition was friction coated with these treated canvases to obtain rubberized canvases.
[0027]
A rubber composition made of chloroprene rubber containing short aramid fibers was used for the compression rubber layer and the stretch rubber layer, and a rubber composition made of chloroprene rubber containing no short fibers was used for the adhesive rubber layer.
[0028]
After preparing these materials, add a reinforcing cloth, an unvulcanized rubber sheet with a stretch rubber layer, an unvulcanized rubber sheet with an adhesive rubber layer, a core wire, and an unvulcanized rubber sheet with a compressed rubber layer to a flat mold. Unwrapped belt sleeves were prepared by winding them one after another. Subsequently, a synthetic resin film (trade name: Saran Wrap) is wound on the outer surface of the unvulcanized belt sleeve along a part of both sides of the mold and wound in two plies in a spiral shape. A canvas with rubber was mounted on the surrounding synthetic resin film, and this was placed in a vulcanizing can and vulcanized.
[0029]
After removal of the mold from the vulcanizer, it was possible to strip the synthetic resin film of the belt sleeve outer surface easily. Further, when the appearance of the belt sleeve was inspected, it was vulcanized as it was on the sheet surface immediately after molding to form an uneven surface, but no porous was generated, and vulcanization was possible without any problems.
[0030]
【The invention's effect】
As described above, in the invention according to claim 1 of the present application, at least the outer peripheral surface of the unvulcanized belt sleeve attached to the mold is surrounded by the film body that does not transmit vapor, and the seal material is unvulcanized belt sleeve. The belt is vulcanized in such a manner that the molding die is placed in a vulcanizing can and vulcanized in a state where steam does not enter the inside of the film body after being mounted on the film body that does not transmit steam provided at the upper and lower corners of the belt. The outer peripheral surface of the unvulcanized belt sleeve is surrounded by a film body that does not transmit steam, and the steam can be vulcanized without using a jacket by preventing steam from entering during vulcanization. There is an effect that can solve various problems when using.
[0031]
In the invention according to claim 2 of the present application, a synthetic resin film is used as a film body which does not transmit vapor, and there is an effect that the surrounding work can be facilitated by wrapping around the outer peripheral surface of the unvulcanized belt sleeve. .
[0032]
[0033]
[0034]
In the invention according to claim 3 of the present application, since the sealing material is a fiber material selected from at least one layer of rubberized canvas and nonwoven fabric, there is an effect of enhancing the sealing effect of the upper and lower corner portions.
[0035]
In the invention according to claim 4 of the present application, the synthetic resin film is wound around part of both side surfaces of the molding die together with the outer peripheral surface of the unvulcanized belt sleeve, and the sealing material is disposed above and below the unvulcanized belt sleeve. A belt vulcanizing method in which the mold is placed in a vulcanizing can after being mounted on a synthetic resin film surrounding a corner portion, and vulcanized in a state where steam does not enter the inside of the film body. By using a film, the outer peripheral surface of the unvulcanized belt sleeve and the upper and lower corners can be surrounded, and the upper and lower corners can be sealed more reliably with a sealing material. It is suitable for the line, has the effect of reducing the loss of working time and vulcanizing at low cost.
[0036]
In the invention according to claim 5 of the present application, in the method for producing a belt sleeve by molding a belt sleeve for a power transmission belt comprising at least a rubber layer and a core wire on the outer peripheral surface of the mold, and then vulcanizing the belt sleeve. After surrounding the belt sleeve along the outer peripheral surface of the belt and part of both sides of the mold with a film body that does not allow vapor to pass through, the mold is placed in the vulcanizing can, and steam is added without entering the film body. This is a belt sleeve manufacturing method in which the film body is removed after vulcanization and vulcanization, and it can be vulcanized without using air bubbles without using a jacket, and as a belt sleeve for V-ribbed belts, toothed belts, etc. Can be used.
[Brief description of the drawings]
FIG. 1 is a diagram showing a step of producing an unvulcanized belt sleeve on a mold in a vulcanization method according to the present invention.
FIG. 2 is a view showing a state in which an unvulcanized belt sleeve produced on a mold is surrounded by a film body in the vulcanization method according to the present invention.
FIG. 3 is a view showing a state in which the film body is surrounded not only on the outer surface of the unvulcanized belt sleeve but also on a part of both side surfaces of the mold in the vulcanizing method according to the present invention.
FIG. 4 is a view showing a case where a sealing material is provided on upper and lower corners of a mold on an enclosed film body in the vulcanization method according to the present invention.
FIG. 5 is a view showing a state where an unvulcanized belt sleeve mounted on a mold is vulcanized in the vulcanization method according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Mold 2 Reinforcement cloth 3 Unvulcanized rubber sheet 4 Unvulcanized rubber sheet 5 Core wire 6 Unvulcanized rubber sheet 7 Belt sleeve 8 Film body 22 Sealing material

Claims (5)

In the vulcanization method of a belt in which an unvulcanized belt sleeve made of at least a rubber layer is attached to a mold and vulcanized, the outer periphery of the unvulcanized belt sleeve attached to at least the mold by a film that does not transmit vapor After surrounding the surface and mounting the sealing material on the non-vulcanized belt sleeve on the upper and lower corners of the belt sleeve through which steam does not permeate , the mold is placed in the vulcanizing can and the steam is A belt vulcanizing method characterized by vulcanizing without entering the inside.   The belt vulcanizing method according to claim 1, wherein the film body that does not transmit vapor is a synthetic resin film. 2. The belt vulcanizing method according to claim 1, wherein the sealing material is a fiber material selected from at least one layer of rubberized canvas and nonwoven fabric .   In a belt vulcanizing method in which an unvulcanized belt sleeve made of at least a rubber layer is attached to a mold and vulcanized, a synthetic resin film is bonded to both sides of the mold together with the outer peripheral surface of the unvulcanized belt sleeve. Wrapping across a part, and then mounting the sealing material on the synthetic resin film surrounding the upper and lower corners of the unvulcanized belt sleeve, the above mold is placed in the vulcanizing can, and the steam is film A belt vulcanizing method characterized by vulcanizing without entering the inside. In a method of manufacturing a belt sleeve by molding a belt sleeve for a power transmission belt composed of at least a rubber layer and a core wire on the outer peripheral surface of the molding die, and then vulcanizing the belt sleeve , both sides of the molding die together with the outer peripheral surface of the belt sleeve. The film is surrounded by a film body that does not transmit vapor over a part of the surface, and the sealing material is mounted on the film body that does not transmit vapor on the upper and lower corners of the unvulcanized belt sleeve, and then the mold is added. A method for producing a belt sleeve, characterized in that the belt sleeve is placed in a sulfur can, vulcanized in a state where steam does not enter the inside of the film body, and the film body is removed after vulcanization.

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