JP2012171108A - Method for manufacturing transmission belt with mark - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a transmission belt with a mark where the mark attached on a back surface is not vanished while using a method for vulcanization-molding a belt body with an orthogonal molding, and favorable appearance is obtained.SOLUTION: The method for manufacturing a transmission belt with a mark includes steps of laminating a film laminated body formed by overlapping a thermoplastic resin film 8 for printing which is printed with a mark 7 on a back face and has a melting point lower than a vulcanization-molding temperature and a mold release resin film 9 having a melting point higher than the vulcanization-molding temperature on a back face side of an outer canvas 2 laminated at a periphery around a molding drum 21 at the inner periphery side; and peeling the mold release resin film 9 from the outermost periphery of a belt body after vulcanization molding. As a result, the mark 7 is prevented from being vanished by covering the mark 7 attached on the back face with the thermoplastic resin film 8 for printing which melts in the vulcanization-molding process, and the thermoplastic resin film 8 for printing is prevented from adhering to a rubber jacket 22 at the peripheral side by blocking the peripheral side of the thermoplastic resin film 8 for printing with the mold release resin film 9 which is not melted.

Description

  The present invention relates to a manufacturing method of a transmission belt with a mark provided with a mark on the back surface.

  When manufacturing transmission belts such as multi-rib belts, toothed belts, cogged belts, V belts, flat belts, etc., between the metal molding drum on the inner circumference and the rubber jacket fitted on the outer circumference The belt back member such as the outer canvas forming the belt body, the stretch rubber layer, the adhesive rubber layer, the core wire, and the compression rubber layer are arranged in this order, and these are heated between the molding drum and the jacket. By pressing and vulcanizing the rubber, the core wire is embedded in the rubber layer, and the endless belt body is vulcanized by a method of bonding the belt back member and the rubber layer. A belt driving surface member such as an inner canvas that is in contact with a driving member such as a pulley may be laminated on the outer side of the compression rubber layer. The core wire is usually wound in a spiral shape and embedded in the adhesive rubber layer.

  This vulcanization molding method of the belt main body includes a method called normal molding in which the belt back member is disposed on the outer jacket side and a method called reverse molding in which the belt back member is disposed on the inner drum side. . The endless belt body, which is vulcanized by reverse molding, is used by reversing the inner peripheral side and outer peripheral side, and the one that is vulcanized by normal molding is used without being reversed. .

  The endless transmission belt manufactured in this way includes a transmission belt with a mark provided with marks such as a product name, a lot number, and a manufacturing date on the back. As a method of giving a mark to the transmission belt with the mark, a transfer mark material in which a mark is attached to a base material such as a resin film is superimposed on a belt back member fixed to the belt back surface and heated and pressed, A method of peeling the base material and transferring the mark to the belt back member (for example, see Patent Document 1) or a method of printing the mark directly on the belt back member with an ink jet printer (for example, see Patent Document 2) is adopted. Yes.

  In any of the methods for applying marks of transmission belts with marks described in Patent Documents 1 and 2, since the mark applied to the belt back member is exposed, a tension pulley, an idler pulley, or the like is brought into contact with the back surface of the transmission belt. In such a case, there is a problem that the mark disappears due to rubbing.

  As a means for preventing the disappearance of such a mark, the present inventors preliminarily press-bonded a thermoplastic resin film on which the mark is printed on the back surface in a state where the mark is printed on the back side of the belt back member. A manufacturing method of a transmission belt with a mark in which a belt main body is vulcanized and molded at a temperature equal to or higher than the melting point of the thermoplastic resin film using a belt back member preliminarily bonded with a plastic resin film has been proposed (Japanese Patent Application 2010). 138987).

  Further, the present inventors further superimpose a thermoplastic resin film for an outer cover on the front side of the thermoplastic resin film for printing on which the mark is printed on the back surface, and superimpose these two thermoplastic resin films. A manufacturing method of a transmission belt with a mark is also proposed (Japanese Patent Application No. 2010-168455), in which the belt main body is preliminarily pressure-bonded and vulcanized and molded at a temperature equal to or higher than the melting point of these thermoplastic resin films.

JP-A-5-42754 JP 7-238992 A

  The manufacturing method of the transmission belt with a mark proposed in the above Japanese Patent Application Nos. 2010-138987 and 2010-168455 is based on a thermoplastic resin film for printing and a thermoplastic resin film for an outer cover, which are melted in the vulcanization molding process of the belt body. The mark given to the belt back member can be covered and its disappearance can be suitably prevented. However, when these manufacturing methods are applied to the positive molding in which the belt back member is arranged on the outer jacket side in the vulcanization molding process, the thermoplastic resin film for melting printing and outer cover adheres to the rubber jacket. However, there is a problem that the appearance is poor. In the reverse molding in which the belt back member is disposed on the inner peripheral molding drum side, even if these thermoplastic resin films melt, they do not adhere to the metal molding drum.

  Accordingly, an object of the present invention is to provide a method for manufacturing a transmission belt with a mark by which a mark applied to the back surface is not lost and a good appearance is obtained by a method of vulcanizing the belt main body by normal molding. It is.

  In order to solve the above-described problems, the present invention provides a belt in which a belt constituent member including at least a rubber layer and a core wire is laminated around a molding drum on an inner peripheral side so that a belt back member is provided on the outermost peripheral side. A main body laminating step, and a rubber jacket is inserted into the outer peripheral side of the belt main body laminated around the molding drum, and the belt main body laminated is heated and pressed between the molding drum and the jacket, and is endless. A vulcanization molding step of vulcanizing and molding the belt main body, and in a manufacturing method of a transmission belt with a mark that gives a mark to the back of the belt main body, before the vulcanization molding step, from a vulcanization molding temperature A printing process in which a reverse mark, which is the reverse of the mark, is printed on the back surface of a printing thermoplastic resin film having a low melting point, and before or after the printing process, the printing thermoplastic resin film. A film superposing process in which a release resin film having a melting point higher than the vulcanization molding temperature is superposed on the surface of the rumm, and a printing thermoplastic resin in which the inversion mark is printed before or after the belt body laminating process. A film laminating step for laminating a film film and a laminated film body obtained by superimposing the release resin film on at least a part of the back side of the belt back member, and after the vulcanization molding step, A method in which a release film peeling process for peeling the resin film from the vulcanized belt main body was provided was adopted.

  That is, before the vulcanization molding step, a printing step of printing a reverse mark on the back surface of the printing thermoplastic resin film having a melting point lower than the vulcanization molding temperature, and before or after this printing step, the printing thermoplasticity Thermoplastic resin film for printing, in which a reversal mark is printed before or after the film stacking process in which a release resin film having a melting point higher than the vulcanization molding temperature is superimposed on the surface of the resin film, and the belt body laminating process And a film laminating step for laminating a laminated film body in which the resin film for mold release is laminated on at least a part of the back side of the belt back member, and the resin film for mold release is vulcanized after the vulcanization molding step. By providing a release film peeling process that peels from the molded belt body, the belt body is vulcanized by forward molding to add a mark to the back surface. Cover with a thermoplastic resin film for printing that melts in the molding process to prevent disappearance of the mark, and melt the melt by blocking the outer periphery of the thermoplastic resin film for printing with a release resin film that does not melt. The printed thermoplastic resin film was prevented from adhering to the rubber jacket on the outer peripheral side so that a good appearance was obtained.

  In the film laminating step, the overlap film body is preliminarily pressure-bonded to the back side of the belt back surface member, thereby bringing the overlap film body into close contact with the belt back surface member, and air or the like is provided at these interfaces to which marks are given. The mark can be displayed neatly without being caught.

  By making the thermoplastic resin film for printing transparent and having a low melting point in the range of 70 to 140 ° C., the thermoplastic resin film for printing is surely melted and the mark is clearly displayed. can do. The vulcanization molding temperature is usually in the range of 140 to 180 ° C.

  The thermoplastic resin film for printing includes ethylene vinyl acetate copolymer, ethylene acrylic acid copolymer, ethylene ethyl acrylate copolymer, ethylene methacrylic acid copolymer, ethylene methyl methacrylate copolymer, ethylene methyl acrylate. It may be formed of at least one selected from a copolymer, an ionomer of an ethylene acrylic acid copolymer, and an ionomer of an ethylene methacrylic acid copolymer. These thermoplastic resin films all carry ink well and can print inversion marks well.

  The printing thermoplastic resin film has a thickness in the range of 10 to 50 μm, preferably in the range of 20 to 30 μm. If the thickness is less than 10 μm, the film tends to be damaged or distorted when printing the reversal mark, making it difficult to print, and possibly causing poor fusion during vulcanization molding. It is because there exists a possibility that the fuse | melted film may peel when it exceeds.

  The release resin film may be a high melting point resin film having a melting point in the range of 200 to 250 ° C.

  The release resin film is a polyester resin composed of polyethylene terephthalate having a melting point of 210 to 245 ° C or polybutylene terephthalate having a melting point of 210 to 225 ° C, and having a melting point of 220 to 245 ° C. It may be formed of at least one selected from a 4-methyl-1-pentene polymer and a triacetyl cellulose having a melting point in the range of 290 to 300 ° C.

  The release resin film has a thickness in the range of 10 to 80 μm, preferably in the range of 20 to 50 μm. If the thickness is less than 10 μm, the film may be damaged when the film is peeled off after vulcanization molding. If the thickness exceeds 80 μm, the resin film for mold release that is made disposable increases.

  By making the release resin film uniaxially or biaxially stretched and strengthened, it is possible to reliably prevent breakage when the film is peeled off after vulcanization molding.

  The method for manufacturing a transmission belt with a mark according to the present invention includes a printing step of printing a reverse mark on the back surface of a thermoplastic resin film for printing having a melting point lower than the vulcanization molding temperature before the vulcanization molding step, Before or after the printing process, a film stacking process in which a release resin film having a melting point higher than the vulcanization molding temperature is superimposed on the surface of the printing thermoplastic resin film, and a printing thermoplastic with a reversal mark printed A film laminating step for laminating a laminated film body in which a resin film and a release resin film are superposed on at least a part of the outer peripheral side of the belt back member disposed on the outermost periphery in the vulcanization molding step; After the molding process, there is a release film peeling process for peeling the release resin film from the vulcanized belt body. It is possible to prevent loss of the mark, to prevent adhesion to the rubber jacket of the molten printed thermoplastic resin films, it is possible to obtain a good appearance.

Partially omitted perspective view showing a marked transmission belt manufactured by the marked transmission belt manufacturing method according to the present invention The flowchart which shows the manufacturing process of the transmission belt with a mark of FIG. Conceptual diagram explaining the printing process of FIG. Conceptual diagram explaining the film stacking step of FIG. FIG. 2 is a conceptual diagram for explaining the belt body lamination step in FIG. (A), (b) is the conceptual diagram explaining the film lamination process of FIG. Conceptual diagram explaining the vulcanization molding step of FIG. The conceptual diagram explaining the release film peeling process of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a marked transmission belt 1 manufactured by the method for manufacturing a marked transmission belt according to the present invention. The transmission belt 1 with a mark is a cogged belt, and an endless belt body is an adhesive rubber in which an outer canvas 2, a stretch rubber layer 4a, and a core wire 3 are embedded as a belt back member from the back side on the outer peripheral side. The mark 7 is formed of a layer 4b, a compression rubber layer 5 having a cog portion 5a formed therein, and an inner canvas 6 in contact with the driving member, and displays a product name, a lot number, and a manufacturing date on the back surface. And is covered with a thermoplastic resin film 8 for printing solidified after melting as described later. The core wire 3 is embedded so as to extend in the belt circumferential direction, the cog portion 5a is formed so as to extend in the direction orthogonal to the belt circumferential direction, and the inner canvas 6 is compressed rubber layer 5 so as to follow the unevenness of the cog portion 5a. It is fixed to.

  The stretch rubber layer 4a, the adhesive rubber layer 4b and the compression rubber layer 5 are made of chloroprene rubber (CR), nitrile rubber (NBR), ethylene propylene rubber (EPDM), hydrogenated nitrile rubber (HNBR), chlorosulfonated polyethylene (CSM). ), Alkylated chlorosulfonated polyethylene (ACSM) and the like.

  The outer canvas 2 and the inner canvas 6 are formed of plain fabric, twill fabric, satin fabric, etc. woven from 6 nylon fiber, 66 nylon fiber, polyester fiber, aramid fiber, etc. After impregnating the same kind of rubber composition by a soaking process, the rubber composition is fixed to the adhesive rubber layer 4b and the compressed rubber layer 5 respectively in a vulcanization molding process described later.

  The core wire 3 is made of inorganic fiber such as para-aramid fiber having high tensile strength, twisted cord of organic fiber twisted with polyester fiber such as polyethylene terephthalate or polyethylene naphthalate, or glass cord twisted with high-strength glass fiber. It is formed of a twisted cord and is embedded in the adhesive rubber layer 4b in the vulcanization molding process.

  The thermoplastic resin film 8 for printing is transparent and has an ethylene vinyl acetate copolymer, ethylene acrylic acid copolymer, ethylene ethyl acrylate copolymer, ethylene methacrylic acid copolymer having a melting point in the range of 70 to 140 ° C. A polymer, an ethylene methyl methacrylate copolymer, an ethylene methyl acrylate copolymer, an ionomer of an ethylene acrylic acid copolymer, and an ionomer of an ethylene methacrylic acid copolymer. Those having a thickness of 20 to 30 μm are solidified after being melted in the vulcanization molding process and are in close contact with the outer canvas 2 so as to cover the mark 7.

  Below, the manufacturing method of the transmission belt 1 with the mark mentioned above is demonstrated. FIG. 2 is a flowchart showing the manufacturing process of the transmission belt 1 with a mark. In this manufacturing process, a printing process for printing the mark 7 on the back surface of the printing thermoplastic resin film 8, and a release resin film 9 to be described later are superimposed on the surface of the printing thermoplastic resin film 8 printed with the mark 7. Around the forming drum 21 described later, the inner canvas 6 forming the belt body, the compressed rubber layer 5, the adhesive rubber layer 4b, and the spiral wound around the forming drum 21 to be described later. A belt body laminating step for laminating the core wire 3, the stretched rubber layer 4 a and the outer canvas 2, and a film body in which the printed thermoplastic resin film 8 and the release resin film 9 are superimposed on the back side of the outer canvas 2. A film laminating step for laminating at least a part, a rubber jacket is fitted on the outer peripheral side of the belt main body laminated around the forming drum 21, and the belt main body is formed into the forming drum Heated and pressed between the 1 and the jacket 22, consisting of an endless vulcanization molding step of the belt body is vulcanized molding and release film peeling step of peeling the release resin film 9 from the belt body.

  FIG. 3 shows the printing process. In this printing process, an ink jet printer 11 capable of on-demand printing is used. The ink jet printer 11 ejects ink from the printer head 11a based on the product name, lot number, and date of manufacture date output from the production management computer 12, and is unwound and supplied from the reel 13 as a roll film. On the printing table 14, the reversed reverse mark 7 is printed on the upper surface of the printing thermoplastic resin film 8. For this printing, white ink having excellent contrast with the black outer canvas 2 is used. The mark 7 to be printed may have a design pattern added to the characters. The printer may be a thermal printer or the like.

  The printing thermoplastic resin film 8 on which the inverted mark 7 is printed is sandwiched between a pair of upper and lower feed rollers 15 and fed forward, and the tip is held by a chuck 16 and stretched in the longitudinal direction. The cutter 17 is cut into a predetermined length L. In this embodiment, the length dimension L is shorter than the outer peripheral length of the outer canvas 2 stacked on the outermost periphery in the belt body stacking step described later. The width dimension W is substantially equal to the width of the outer canvas 2, that is, the width of the belt body laminate. Therefore, in the film stacking step described later, a part of the back surface of the outer canvas 2 is covered with the printing thermoplastic resin film 8.

  FIG. 4 shows the film stacking step. In this film stacking step, the release resin film 9 is stacked on the opposite surface with the surface on which the mark 7 of the printing thermoplastic resin film 8 is printed as the back surface. The length dimension of the release resin film 9 is made equal to the length dimension L of the cut printing thermoplastic resin film 8, and the width dimension is the printing thermoplastic resin film 8 in the vulcanization molding process described later. Is formed to be slightly wider than the width dimension W of the printing thermoplastic resin film 8 to such an extent that it does not protrude outside the overlapped release resin film 9 when melted. This film stacking step can also be performed before the printing step.

  The release resin film 9 has a thickness of 20 to 50 μm and a polyester resin composed of polyethylene terephthalate having a melting point in the range of 210 to 245 ° C. or polybutylene terephthalate having a melting point in the range of 210 to 225 ° C. Is formed of at least one selected from 4-methyl-1-pentene polymer having a melting point of 290 to 300 ° C. and uniaxial or biaxial Stretch strengthened.

  FIG. 5 shows the belt body lamination step. In this belt body laminating step, the inner canvas 6 and the compressed rubber layer 5 form the belt body from the innermost circumference toward the outermost circumference around the metal forming drum 21 having the convex portion 21a formed on the outer circumference. Then, the adhesive rubber layer 4b, the core wire 3 wound in a spiral shape, the stretched rubber layer 4a, and the outer canvas 2 are laminated.

  6A and 6B show the film laminating step. In this film laminating step, as shown in FIG. 6 (a), it is cut in advance to a predetermined length shorter than the outer peripheral length of the transmission belt 1, and impregnated with the same rubber composition as the stretched rubber layer 4a and the adhesive rubber layer 4b. The laminated film laminated in the film overlapping step is laminated on the back side of the outer canvas 2 facing the back surface of the thermoplastic resin film 8 on which the mark 7 is printed, and thereafter, FIG. As shown in Fig. 4, the laminated outer canvas 2 and the film stack are preliminarily pressure-bonded. The pre-bonding is performed by a hot press, the heating temperature is 100 to 130 ° C., the pressing surface pressure p1 is 0.2 to 0.4 MPa, and the pressing time is 3 to 20 seconds. By this pre-compression, a part of the printing thermoplastic resin film 8 is melted and the film stack is brought into close contact with the outer canvas 2, and from the interface between the laminated outer canvas 2 and the printing thermoplastic resin film 8. Air etc. are excluded. Therefore, the mark 7 given to this interface is displayed neatly. This film lamination process can also be performed before the belt body lamination process.

  FIG. 7 shows the vulcanization molding process. In this vulcanization molding step, a rubber jacket 22 is fitted on the outer peripheral side of the belt main body laminated around the molding drum 21 in the belt main body lamination step, and the belt main body laminated is formed with the molding drum 21 and the jacket 22. The belt body is vulcanized and molded by heating and pressurizing. The heating temperature in the vulcanization molding step is 140 to 180 ° C., the pressing surface pressure p2 is 0.1 to 3 MPa, and the pressing time is 20 to 40 minutes. In this vulcanization molding step, the core wire 3 is embedded in the adhesive rubber layer 4b, the outer canvas 2 and the inner canvas 6 are bonded to the stretch rubber layer 4a and the compression rubber layer 5, respectively, and the convex portion of the molding drum 21 is further provided. A cog portion 5a is formed in the compressed rubber layer 5 by 21a to form an endless belt body, and the printing thermoplastic resin film 8 on the outer peripheral side of the outer canvas 2 is melted, so that the back surface of the outer canvas 2 is melted. The mark 7 given to is covered.

  FIG. 8 shows the release film peeling step. In this release film peeling step, the jacket 22 is removed from the vulcanized belt body, and the release resin film 9 is peeled from the outermost periphery of the belt body. After that, the formed endless belt body is extracted from the forming drum 21, mounted on a separate mantle, cut into a V-shaped cross section while rotating the belt body, and each marked transmission shown in FIG. The belt 1 is manufactured. The thermoplastic resin film for printing 8 that melts at the time of vulcanization molding is cut off from the rubber jacket 22 on the outer peripheral side by the release resin film 9 that does not melt, so the jacket for removing the thermoplastic resin film for printing 8 is removed. It does not adhere to 22. Therefore, the marked transmission belt 1 having a good appearance can be manufactured.

  In the embodiment described above, a part of the back surface of the outer canvas is partially covered with the printing thermoplastic resin film, but the entire back surface of the outer canvas may be covered with the printing thermoplastic resin film.

  In the above-described embodiment, the marked transmission belt is a cogged belt and has an inner canvas. However, the marked transmission belt manufacturing method according to the present invention includes a multi-rib belt, a toothed belt, a V belt, It can also be used to manufacture other marked transmission belts such as flat belts, and the inner canvas can be omitted. In the compressed rubber layer, short fibers such as 6 nylon, 66 nylon, polyester, and aramid may be mixed as reinforcing fibers.

DESCRIPTION OF SYMBOLS 1 Transmission belt with mark 2 Outer canvas 3 Core wire 4a Stretch rubber layer 4b Adhesive rubber layer 5 Compression rubber layer 5a Cog part 6 Inner canvas 7 Mark 8 Printing thermoplastic resin film 9 Release resin film 11 Inkjet printer 11a Printer head 12 Computer 13 Reel 14 Printing stand 15 Feed roller 16 Chuck 17 Cutter 21 Molding drum 21a Convex part 22 Jacket

Claims (9)

  A belt body laminating step of laminating at least a rubber layer and a belt constituting member consisting of a core wire so as to provide a belt back surface member on the outermost peripheral side around the inner peripheral side forming drum; A vulcanization molding step in which a rubber jacket is fitted on the outer peripheral side of the belt body laminate, the belt body laminate is heated and pressurized between a molding drum and a jacket, and an endless belt body is vulcanized. In the manufacturing method of a transmission belt with a mark for providing a mark on the back surface of the belt body, the back surface of the thermoplastic resin film for printing having a melting point lower than the vulcanization molding temperature before the vulcanization molding step In addition, a printing step of printing a reverse mark in which the mark is reversed face down, and before or after the printing step, the surface of the thermoplastic resin film for printing is higher than the vulcanization molding temperature. The thermoplastic resin film for printing on which the reversal mark is printed and the release resin film are overlapped before or after the belt stacking step for superimposing the release resin film having dots and the belt body stacking step. A film laminating step for laminating the laminated film body on at least a part of the back side of the belt back member, and after the vulcanization molding step, the release resin film is peeled off from the vulcanized belt main body. The manufacturing method of the transmission belt with a mark characterized by providing the release film peeling process to perform.   The manufacturing method of the transmission belt with a mark of Claim 1 which made the said laminated | multilayer film body press-press to the back side of the said belt back surface member at the said film lamination process.   The manufacturing method of the transmission belt with a mark of Claim 1 or 2 which used the said thermoplastic resin film for printing as a transparent and low melting point resin film in the range of 70-140 degreeC.   The printing thermoplastic resin film is made of ethylene vinyl acetate copolymer, ethylene acrylic acid copolymer, ethylene ethyl acrylate copolymer, ethylene methacrylic acid copolymer, ethylene methyl methacrylate copolymer, ethylene methyl acrylate. The manufacturing method of the transmission belt with a mark of Claim 3 formed with at least 1 sort (s) chosen from the ionomer of a copolymer, the ethylene acrylic acid copolymer, and the ionomer of an ethylene methacrylic acid copolymer.   The manufacturing method of the transmission belt with a mark in any one of Claims 1 thru | or 4 which made the thickness of the said thermoplastic resin film for printing the range of 10-50 micrometers.   The manufacturing method of the transmission belt with a mark in any one of Claim 1 thru | or 5 which made the said resin film for mold release the resin film of high melting | fusing point whose range is 200-250 degreeC.   The release resin film is made of polyethylene terephthalate having a melting point in the range of 210 to 245 ° C, or a polyester resin made of polybutylene terephthalate having a melting point in the range of 210 to 225 ° C, and having a melting point of 220 to 245 ° C. The manufacturing method of the transmission belt with a mark of Claim 6 formed with at least 1 sort (s) chosen from the 4-methyl- 1-pentene type polymer and the triacetyl cellulose which has melting | fusing point of the range of 290-300 degreeC. .   The manufacturing method of the transmission belt with a mark in any one of Claim 1 thru | or 7 which made thickness of the said resin film for mold release the range of 10-80 micrometers.   The manufacturing method of the transmission belt with a mark in any one of Claim 1 thru | or 8 which extended | stretched and strengthened the said resin film for mold release by carrying out the uniaxial or biaxial stretching.

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