JP4781778B2 - Manufacturing method of jacket - Google Patents

Description

  The present invention relates to a manufacturing method of a jacket mainly used for manufacturing a conveyor belt, and in particular, a paper sheet or a coin such as a banknote, a card, a ticket, a postcard or the like used for a change machine, a vending machine, an automatic bill collection machine or the like. The present invention relates to a manufacturing method of a jacket used for manufacturing a transport belt that transports by the frictional force of the surface of the belt.

  Conventionally, in the internal structure of vending machines such as juices, magazines, tickets, etc., a mechanism using rollers has been used for transporting banknotes and prepaid cards. However, there are problems such as banknotes and other items being wrapped around the rollers during conveyance. Recently, two belts made of elastomer with a flat back surface are placed back to back to improve the reliability of conveyance. Thus, an increasing number of belts use a mechanism for nipping and conveying the belts between the backs of the belts.

  At present, in the case of a mechanism using a belt, in order to efficiently use the conveying ability of the belt, the entire contact area between the belt and the article is used using the entire back surface of the belt. Therefore, the surface of the back surface of the belt is smoothed so that the contact area between the articles is increased as much as possible, and further, the hardness of the elastomer on the back surface of the belt is decreased to increase the coefficient of friction. .

  Thus, increasing the contact area and softening the elastomer itself are highly effective in transporting banknotes, cards, and the like, and ensured transport. However, if the usage period is extended, the belt banknotes and card transport surface will be covered with dust and other debris and dust, or water droplets from rain that will be carried on the transported object. There is a problem that the friction coefficient of the belt conveyance surface is lowered and the conveyance capability is lowered at the same time. In addition, lowering the elastomer hardness to increase the coefficient of friction results in lower wear resistance, and wear debris on the conveyor surface of the belt can adversely affect peripheral sensors, etc. In addition, there is a problem that the durability of the belt is deteriorated and the life is shortened.

  Therefore, in order to solve the above-described problems, it has been proposed to provide a pattern on the conveying surface of the belt to suppress a decrease in friction coefficient and a decrease in feeding accuracy. There is one provided with a pattern obtained by biting a net-like member such as a knitted fabric and peeling it off (see, for example, Patent Document 1).

  This belt can maintain a constant coefficient of friction even when oil or water adheres to the back of the belt, and even when the usage period is long, paper sheets such as banknotes, cards, tickets, postcards, etc. This is a conveyor belt that is excellent in that the accuracy of feeding a conveyed object such as a coin or a coin does not decrease.

  However, there are the following problems. By vulcanizing the rubber sheet with the knitted fabric covered and peeling off the knitted fabric that has penetrated the rubber after vulcanization, a very deep knitted fabric pattern can be applied, but the knitted fabric is peeled off during the belt manufacturing process. Since the process is essential, it takes time and effort. In addition, after cooling, the knitted fabric cannot be peeled off, so it is necessary to peel it off at a high temperature before cooling, so the order of the processes can be restricted, and if the knitted fabric is torn during peeling, the subsequent peeling work is difficult It may become a defective product.

  On the other hand, in the method of manufacturing a conveyor belt having a rubber conveyance surface, the conveyance surface is vulcanized in a state in which the jacket is provided with a mesh pattern in an unvulcanized state, in contact with the conveyance surface. It has been proposed to provide a mesh pattern on the transport surface (see, for example, Patent Document 2).

JP 2000-247477 A JP 2002-273740 A

  As a manufacturing method of a jacket provided with a mesh pattern used here, specifically, a pattern-added vulcanized rubber sheet in which unvulcanized rubber is laminated on a metal plate with a mesh pattern and provided with a flat press is used as a mold. A method of laminating unvulcanized rubber sheets and vulcanizing them together by wrapping them around, laying a knitted fabric etc. on an unvulcanized rubber sheet, vulcanizing, and adding a pattern by peeling the knitted fabric Similarly, there has been a method in which a vulcanized rubber sheet is similarly wound around a mold, an unvulcanized rubber sheet is laminated, and vulcanized and integrated to form a jacket.

  When a pattern is provided by laminating a knitted fabric etc. on an unvulcanized rubber sheet, wrapping around a mold and vulcanizing, and peeling the knitted fabric, an endless sleeve-like shape can be created once. Since the pattern is greatly disturbed at the joint when the knitted fabric is wound, it is necessary to cut the portion and use it, and eventually the sheet has an end portion.

  In any method, a pattern-added vulcanized rubber sheet having an end is wound around a mold and further laminated with an unvulcanized rubber sheet and vulcanized and integrated. The joint part of is inevitably made. Because it is a vulcanized rubber sheet joint, the joint part will never be completely integrated, and it may be a weak point or a step compared to other parts. When the belt is manufactured using repeatedly, there is a problem that the joint part is cracked early and cannot be used as a jacket, or when there is a step in the joint part even if no crack occurs The level difference is transferred to the product belt and the quality of the belt is lowered.

  Therefore, in the present invention, such a problem is solved, and as a jacket for manufacturing a belt, even if it is repeatedly used as a jacket having no joint portion at least on a surface in contact with the belt, cracks or steps are transferred to the belt. It is an object of the present invention to provide a method for manufacturing a jacket that does not occur.

In order to achieve the above object and solve the problems, the present invention provides a method for manufacturing a jacket provided with a mesh pattern, which is not added to a cylindrical mold having a mesh pattern on its surface. A vulcanized rubber sheet is wound around and vulcanized to prepare a spare sleeve having a mesh pattern on one side, and the spare sleeve is covered with a cylindrical mold having a smooth surface so that the mesh pattern is on the inside, and further unadded after stacking the vulcanized rubber sheet, characterized by vulcanization integrally molded.

According to a second aspect of the present invention, the spare sleeve is a semi-vulcanized jacket manufacturing method having a vulcanization degree of 45 to 75% .

  In the present invention, an endless spare sleeve having a mesh pattern is produced by wrapping an unvulcanized rubber sheet around a mold provided with a mesh pattern and vulcanizing, so that the surface with the pattern becomes the inner surface of the jacket. Further, since a jacket is produced by wrapping unvulcanized rubber around the outside to produce a jacket, there is no joint portion on at least the inner surface that contacts the belt when the belt is produced with the jacket. Therefore, even if the jacket is used repeatedly, there is no problem that cracks are generated from the joint portion, and there is no problem that the step of the joint portion is transferred to a belt manufactured using the jacket.

  Further, when the preliminary sleeve is produced, it is in a semi-vulcanized state, so that it is firmly integrated with the unvulcanized rubber sheet laminated on the outer side when vulcanized.

  FIG. 1 is a perspective view of a jacket 1 provided with a net-like pattern 2 obtained by the manufacturing method of the present invention. The jacket 1 used for manufacturing a conveyor belt is provided with a net-like pattern 2 on the inner peripheral surface. In addition, at least the inner peripheral surface is made of vulcanized rubber.

  The manufacturing method of the jacket 1 which concerns on this invention is demonstrated according to an accompanying drawing. An unvulcanized rubber sheet 4 is wound around a cylindrical mold 3 having a net-like pattern on the surface, and a jacket J is placed in a vulcanizing tube K as shown in FIG. Sulfurate. At that time, when the net pattern of the mold 3 is transferred to the unvulcanized rubber sheet 4 and removed from the mold, the spare sleeve 5 having the net pattern on the inner surface is obtained.

  Next, as shown in FIG. 4, the preliminary sleeve 5 is placed on a cylindrical mold 6 having a smooth surface so that the net pattern is on the inside, and further, the unvulcanized rubber sheet 7 is wound around the outside and laminated and heated. -Pressurization and vulcanization integral molding can form the cylindrical jacket 1 having the mesh pattern 2 on the inner peripheral surface.

  Examples of what can be used as the mesh pattern 2 provided on the mold 4 include a knitted fabric pattern, a woven fabric pattern, and a suede woven fabric pattern. Most preferably, a knitted fabric pattern is used. By transferring a peculiar pattern of the knitted fabric pattern to the conveyance surface of the conveyance belt, it is possible to prevent a decrease in the coefficient of friction, improve conveyance performance such as feeding accuracy, and maintain the performance for a long time.

  The preliminary sleeve 5 is made of a single or blended rubber composition using butyl rubber, silicon rubber, chloroprene rubber, nitrile rubber, hydrogenated nitrile rubber or the like. Among these, it is preferable to use butyl rubber or silicon rubber because the increase in the hardness of the jacket is suppressed and durability is good even if the use frequency is high at high temperatures. As a compounding agent, a vulcanizing agent, carbon black, zinc white, stearic acid, a plasticizer, an antiaging agent, and the like are added to the rubber composition. However, these compounding agents are not particularly limited, and are added as desired.

  The unvulcanized rubber sheet 7 laminated on the outside of the preliminary sleeve 5 is desirably a rubber composition having the same composition as the rubber of the preliminary sleeve 5. However, it is also possible to make a different composition as desired. Further, the number of unvulcanized rubber sheets 7 is not limited to one, and a plurality of unvulcanized rubber sheets 7 can be laminated until reaching a thickness required for use as the jacket 1.

  When the preliminary sleeve 5 is vulcanized, it is preferable that the preliminary sleeve 5 is not completely vulcanized but is produced in a semi-vulcanized state. By doing so, the unvulcanized rubber sheet 7 wound around the outside of the preliminary sleeve 5 and the preliminary sleeve 5 can be more firmly integrated by heating and pressurizing and vulcanizing, and the resulting jacket 1 is obtained. The lifetime of the battery can be made longer. Moreover, it is preferable that the vulcanization degree of the half vulcanization at that time shall be 45 to 75% of range. When the degree of vulcanization is less than 45%, it becomes difficult to maintain the shape of the mesh pattern transferred and formed on the preliminary sleeve 5, and when it exceeds 75%, the unvulcanized rubber sheet 7 wound around the outer side of the preliminary sleeve 5 and This is not preferable because vulcanization adhesion of the resin becomes incomplete and leads to problems such as peeling between the two.

  Next, the belt manufactured using the jacket 1 manufactured by the above method is, for example, as follows.

  A conveying belt manufactured by the manufacturing method of the present invention will be described with reference to the accompanying drawings. FIG. 5 is a cross-sectional perspective view of a main part of the conveying belt according to the present invention, FIG. 6 is an enlarged cross-sectional view along AA in FIG. 5, and FIG. 7 is a schematic side view showing an example of usage of the conveying belt. It is. In addition, although the case where the conveyance belt manufactured by this invention is applied to a toothed belt is demonstrated here, it is not restricted to a toothed belt, V-ribbed belt, a low edge belt, a low edge cog belt, a flat belt, etc. It can also be applied as an outer layer of a roller.

  In FIG. 1, the toothed belt 11 for conveyance has a plurality of tooth portions 12 along the longitudinal direction of the belt and a back portion 14 in which a core wire 13 is embedded, and a tooth cloth is provided on the surface of the tooth portion 12. 15 is stuck. The transport surface 16 is provided with a net pattern. The pitch of the tooth portion 12 is preferably 3 mm or less, which can reduce the rotational fluctuation rate and increase the feeding accuracy.

  The rubber used for the tooth part 12 and the back part 14 is chloroprene rubber, nitrile rubber, hydrogenated nitrile rubber, natural rubber, EPT (ethylene propylene terpolymer), styrene-butadiene rubber, butyl rubber, chlorosulfonated polyethylene rubber, etc. It consists of a rubber composition using In the above rubber, carbon black, zinc white, stearic acid, plasticizer, anti-aging agent, etc. are added as compounding agents, and sulfur and organic peroxides are added as vulcanizing agents. The vulcanizing agent is not particularly limited. Further, the toothed belt 1 for conveyance according to the present invention may have an antistatic function depending on usage, and therefore the electric resistance value of the belt is adjusted to a low value such as 6 MΩ by adding the carbon black or the like. It is also possible to keep it.

  Moreover, you may mix | blend the chloroprene rubber excellent in crystal resistance as at least one part of a rubber component. As the crystal-resistant chloroprene rubber, those commercially available as a crystal-resistant grade can be used. As a measure of crystal resistance, the hardness (JIS) when left at 0 ° C. for 100 hours is used. The increase in hardness is preferably 10 ° C. or less. Of course, the change in hardness is ideally zero. The compounding amount of the crystal-resistant chloroprene rubber is preferably set so that the content in the rubber composition is 40% by weight or more, and the crystal-resistant chloroprene rubber occupies all the rubber components. It may be.

  Crystal resistant chloroprene rubber is hard to crystallize and hard to harden even if left in a low temperature environment for a long time. Therefore, when a rubber layer comprising the back portion 14 and the tooth portion 12 is formed with a rubber composition containing a crystal-resistant chloroprene rubber, an increase in the hardness of the rubber layer due to crystallization in a low temperature environment is suppressed, and at a low temperature It is possible to prevent a decrease in the friction coefficient.

  In addition, as shown in FIG. 7, the belt 11 for conveyance is used in such a manner that the two belts 11 a and 11 b are driven back to back and the conveyance object 16 is nipped and conveyed between the back surfaces. In addition, by having a net pattern as described above, even if waste, dust, or dust of the conveyed product adheres, it can be removed out of the pattern groove or the conveying surface 16 by rubbing between the belts, Debris, dust, dust, and the like are unlikely to accumulate on the convex portion that is a contact point with the conveyed product. Therefore, it is possible to maintain a good conveyance capability over a long period.

  Moreover, since it can also be said that a conveyed product is hooked and conveyed by the convex part of a conveyance surface, it can be said that conveyance mistakes, such as a slip, do not occur more easily.

  The procedure for manufacturing the belt will be described with an example of manufacturing a toothed belt. First, a stretchable tooth cloth 15 is wound in the circumferential direction of a mold 20 having a tooth shape, and a rope to be a core wire 13 is wound in a spiral shape on the tooth cloth 15 and then a tooth portion 12 and a back portion 14 are not added. Wrap the rubber rubber sheet. Further, the jacket 1 is put on the outside of the unvulcanized rubber sheet. The process up to this point is a normal process for manufacturing a toothed belt. And in this invention, the mesh pattern 2 is provided in the surface contact | abutted to the conveyance surface 16 (back surface of a toothed belt) of the jacket 1 wound around the outer side of this unvulcanized rubber sheet.

  As shown in FIG. 8, the jacket 1 is placed in a vulcanizer 22 having a bag-like pressure member 21 made of vulcanized rubber that is inflated by air pressure. By sending pressurized air into the pressure member 21, the pressure member 21 expands and pressurizes the jacket 1. The vulcanization time is about 20 to 40 min, the temperature is about 160 to 170 ° C., and the pressure is about 0.75 to 0.85 MPa.

  For heating, an electric heater 23 is provided inside the mold 20 or inside the vulcanizer 22 to heat the laminated body made of unvulcanized rubber including the core wire 13 and the tooth portion 12 and the back portion 14. And vulcanization is complete. The heating method is not limited to the electric heater, and it is also possible to heat by circulating the heated oil in the mold or sending steam.

  By performing vulcanization with the jacket 1 provided with the mesh pattern 2 in contact, teeth are formed on the inner surface of the belt as shown in FIG. 9, and the jacket is formed on the conveying surface 16 (back surface of the belt). A transfer belt (belt sleeve) 11 to which the net pattern 2 provided on 1 is transferred is completed. When the vulcanization is completed, the belt 1 can be manufactured by removing the jacket 1 from the vulcanization can and cutting it to a predetermined width as required.

  Since the fluidity of unvulcanized rubber is increased by heating at the time of vulcanization, the net pattern 2 provided on the jacket 1 bites into the rubber with increased fluidity due to the force restrained by the jacket 1. Then, the vulcanized rubber is cured by being vulcanized while being in a state of being entrapped.

  A conventional method of applying a net pattern by covering a net-like member on unvulcanized rubber and vulcanizing the net-like member into the rubber, and forcibly stripping the knitted fabric after vulcanization. The method of the present invention in which a pattern is formed using a jacket provided with a knitted fabric pattern is easier than simply omitting the step of attaching the mesh member, the step of stripping the mesh member, etc. Can be said.

  Further, in the process of peeling the mesh member, the mesh member may be torn, and in that case, it becomes difficult to completely remove the knitted fabric, and in some cases, it cannot be peeled off and becomes a defective product as a product. On the other hand, the method of the present invention does not cause a problem such as breakage of the mesh member, which not only facilitates production but also helps to reduce the defective rate of products.

  Although it is the depth of the net-like pattern 2 provided in the jacket 1, it is preferable to set it as the pattern of the range of 0.1-0.6 mm in average depth. When the average depth is less than 0.1 mm, the effect of conveying the object to be caught by the convex portion of the pattern becomes thin, and it is less expected to maintain and maintain the friction coefficient and improve the conveying performance such as feeding accuracy. On the other hand, if the depth exceeds 0.6 mm, the convex part on the surface of the transport surface may be scraped off due to friction with the transported object or friction between the belts when sandwiched and transported by two belts. If it is torn off, the rubber powder may be scattered around the periphery, or the belt may be damaged in some cases, which is not preferable.

  FIG. 10 is a perspective view showing a state where the jacket 1 is unfolded after the conveyor belt (belt sleeve) 11 is wound around the mold 20 and the jacket 1 is covered and vulcanized. In the method for manufacturing the conveyor belt, the conveyor surface 16 is vulcanized in a state where the jacket 1 provided with the mesh pattern 2 is in contact with the conveyor surface 16 with the conveyor surface 16 unvulcanized. A mesh pattern is transferred to FIG. Therefore, even if oil or moisture adheres due to the mesh pattern on the transport surface, the transport capability such as the transport accuracy of the transported object can be maintained at a high level without reducing the friction coefficient.

(Example)
The jackets of the examples were prepared by the manufacturing method of the present invention. A pattern of a knitted fabric having a height of 6 μm was provided on the mold surface by etching, and an unvulcanized butyl rubber sheet was wound around and semi-vulcanized. An endless spare sleeve having a pattern is created, and the spare sleeve is placed on a mold having a smooth surface, and an unvulcanized butyl rubber sheet is wound from above to vulcanize and integrate to form an inner surface with no joints or steps. Created no jacket. A belt sleeve for conveyance in which the core and the back portion are made of hydrogenated nitrile rubber and are made of polyester fiber using the jacket, the belt having a total thickness of 0.9 mm, and the rear surface being the conveyance surface The vulcanization was carried out on the pattern provided by transferring the net pattern provided on the jacket. The belt vulcanization conditions were 170 ° C. × 30 minutes. Repeated vulcanization of the belt. The inside of the jacket was observed. The results are shown in Table 1.

(Comparative example)
The jacket of the comparative example was vulcanized by winding a knitted fabric and an unvulcanized butyl rubber sheet around a cylindrical mold. Cut the endless rubber sleeve with the knitted cloth in the end corresponding to the end of the knitted fabric to make it an end sheet, and then peel off the knitted cloth that has penetrated the vulcanized rubber sheet. A sheet with a mark was obtained. Cut out the uneven pattern at the end of the knitted fabric, wrap it around the mold so that the pattern is on the inside, wrap the unvulcanized rubber sheet on the outside and laminate and vulcanize Was integrated into a jacket. A belt sleeve for conveyance in which the core and the back portion are made of hydrogenated nitrile rubber and are made of polyester fiber using the jacket, the belt having a total thickness of 0.9 mm, and the rear surface being the conveyance surface The vulcanization was carried out on the pattern provided by transferring the net pattern provided on the jacket. The belt vulcanization conditions were 170 ° C. × 30 minutes. Repeated vulcanization of the belt. The inside of the jacket was observed. The results are shown in Table 1.

  As can be seen from the results in Table 1, cracks were confirmed in the joint after 10 times of vulcanization of the belt using a conventional jacket having a joint, whereas the joint or step on the inner surface was confirmed. In the case of the jacket manufactured by the method of the present invention without any of the above, even when it was repeatedly used for vulcanization of the belt 200 times, no more occurred on the inner surface.

  In addition, on the back of the conveyor belt made with the jacket of the comparative example, a slight step pattern is transferred at the joint of the jacket, whereas the conveyor belt using the jacket of the embodiment has a uniform pattern. It became the belt which has.

It is a perspective view of the jacket obtained by the manufacturing method of this invention. In the manufacturing method of the jacket of this invention, it is a perspective view of the place which wound the unvulcanized rubber sheet around the metal mold | die which has a net-like pattern. It is sectional drawing which shows the mode of being vulcanized with a vulcanization can. It is the perspective view of the place which covered the preliminary | backup sleeve on the metal mold | die and wound the unvulcanized rubber sheet. It is a section perspective view of the conveyance belt manufactured using the jacket created with the manufacturing method of the present invention. It is an AA expanded sectional view in FIG. It is a side schematic diagram of an example of a use form of a belt for conveyance. It is sectional drawing of the place which is vulcanizing the belt. It is sectional drawing of the belt of the state with which the metal mold | die after vulcanization | cure was mounted | worn. It is perspective explanatory drawing which shows a mode that the jacket was cut open.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Jacket 2 Reticulated pattern 3 Mold 4 Unvulcanized rubber sheet 5 Spare sleeve 6 Mold 7 Unvulcanized rubber sheet 11 Conveying belt 12 Tooth part 13 Core wire 14 Back part 15 Tooth cloth 16 Conveying surface 20 Mold 21 Pressure member 22 Vulcanizer 23 Electric heater

Claims (2)

A jacket manufacturing method in which a reticular pattern, to produce a wound unvulcanized rubber sheet in a mold of cylindrical shape having a mesh pattern on the surface vulcanized pre sleeve having a reticular pattern on one surface after the preliminary sleeve laminating further unvulcanized rubber sheet over the mold surface smooth cylindrical shape as reticular pattern on the inside, the jacket manufacturing method characterized by vulcanization integrally molded . The method for manufacturing a jacket according to claim 1 , wherein the preliminary sleeve is in a semi-vulcanized state having a vulcanization degree of 45 to 75% .

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