JP2004237740A - Rubber belt vulcanizing method and unvulcanized belt molding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the quality of a belt as a product by avoiding the occurrence of a defect in the product due to porosity, caused by the insufficient degassing of an unvulcanized belt molding in vulcanizing treatment, and poor adhesion of a core wire with rubber. <P>SOLUTION: A degassing member 20 with gas permeability is interposed at one end in the axial direction of a belt sleeve between a core wire material 5b and an inner belt sleeve 5a or between the material 5b and an outer belt sleeve 5c in a state wherein an outside end in the axial direction of the belt sleeve is positioned to the outside with respect to the end in the axial direction of the belt sleeve, so that a state, wherein the core wire 5b communicates with the outside of the belt molding 5, can be maintained via the member 20 in the vulcanizing treatment via a jacket. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

  The present invention relates to a method for vulcanizing a rubber belt and an unvulcanized belt molded product used for the method, and more particularly to a technique for producing a high-quality rubber belt without poor deaeration during vulcanization. It is.

  An outline of a conventional vulcanizing device for an unvulcanized rubber belt and an unvulcanized belt molded body used for the vulcanizing device are as follows. That is, as shown in FIG. 7, the belt vulcanizing apparatus A includes a supporting assembly table 1 for erecting a cylindrical mold 2 on which an unvulcanized rubber belt molded body 5 described below is externally mounted, and a cylindrical vulcanizing apparatus A. In order to cover and close the upper side of the mold 2, a flange 3 placed on the cylindrical mold 2, an upper lid 4 provided above the flange 3, and an exterior It comprises a cylindrical rubber-made jacket 6 which is externally provided on the molded unvulcanized belt 5 and a vulcanized can 7 in which these are hermetically sealed.

  An upper inlet 8 for passing high-pressure steam into the vulcanizer 7 and a lower outlet 9 are provided on the vulcanizer 7, and an inlet pipe for passing low-pressure steam into the mold 2. A bottom member 12 provided with a discharge pipe 11 and a discharge pipe 11 is disposed below the mold 2 on the lower surface side of the supporting assembly table 1. High-pressure steam from a high-pressure steam supply source (not shown) is supplied to the vulcanizer 7 using an inlet 8 and an outlet 9, and low-pressure steam from a low-pressure steam supply source (not shown) is supplied to an introduction pipe 10 and a discharge pipe. 11 so as to be freely supplied into the mold 2.

  The unvulcanized belt molded body 5 is formed by sequentially winding the respective rubber belt components of the inner belt sleeve 5a, the core wire 5b as the reinforcing material, and the outer belt sleeve 5c on the outer peripheral surface of the mold 2 as a molding die. It is formed by doing. In the vulcanization step, a jacket 6 made of a flexible material such as a rubber material is extrapolated around the outer periphery of the unvulcanized belt molded body 5 having the mold 2 and then put into a vulcanizing can 7 in that state. That is, the mold assembly in which the mold 2, the unvulcanized belt molded body 5, and the jacket 6 are integrated is attached to the support assembly table 1 with the flange 3 provided at one end thereof facing upward. The vulcanizing apparatus A is installed upright so as to cover the introduction section 13.

Thereafter, the upper lid 4 is closed, and the flange 3, the supporting assembly table 1, the mold 2, and the jacket 6 surround and press and clamp the same, so that the steam in the vulcanizing can 7 is formed on the unvulcanized belt molded body 5. Sealed to prevent direct contact. Then, the unvulcanized belt molded body 5 is vulcanized while being tightened by the jacket 6 by pressurizing and heating by injecting high-pressure steam outside the jacket 6 and low-pressure steam inside the mold 2 respectively. A vulcanization step is performed. As such a technique, for example, a technique disclosed in Japanese Patent Application Laid-Open No. 7-314453 is known.
JP-A-7-314453

  In a conventional vulcanizing method using a vulcanizing apparatus, a vulcanizing treatment is performed by heating while applying pressure by a difference in vapor pressure acting on the inside and outside of an unvulcanized belt molded body. However, in this method, the air existing in the unvulcanized belt molded body, the air existing in the gap between the unvulcanized belt molded body and the rubber jacket fitted to the outer peripheral surface, and the rubber generated during the vulcanization. In some cases, the gas components that are generated cannot be completely trapped during vulcanization.

  In other words, the high-pressure steam injected into the outside of the jacket causes the upper and lower ends of the jacket to be in a state where the neck is tightened, the outer diameters of both end surfaces are reduced, and the internal air and gas components are confined. As a result, there is a disadvantage that a defective belt having bubbles therein is generated. In addition, when the jacket is pushed to the mold side, the space between the jacket, the mold, the upper lid, and the support base is substantially in a sealed state, and the above-described inconvenience is liable to be caused even when the air or the like cannot be sufficiently removed. . In particular, there is a problem that air bubbles concentrate around the core wire inside the belt, resulting in poor porous or poor adhesion between the core wire and rubber.

  The present invention has been made in view of the above problems, and has as its object the above-described porous defect due to insufficient degassing of the unvulcanized belt molded body during the vulcanization treatment, and the core wire and rubber. An object of the present invention is to improve the quality of a belt as a product and thereby reduce costs by avoiding the occurrence of a product defect due to poor adhesion.

Means for Solving the Problems and Effects of the Invention

  The unvulcanized belt sleeve of the present invention is formed by concentrically laminating an inner belt sleeve, an outer belt sleeve, and a core wire interposed between these belt sleeves, and the inner circumference of the inner belt sleeve. A cylindrical mold disposed on the outer side, and a tubular jacket disposed on the outer peripheral side of the outer belt sleeve, with heating and pressurized fluid on the outer peripheral side of the jacket, and An unvulcanized belt formed of an endless belt used in a vulcanizing apparatus capable of vulcanizing by supplying a heating fluid to the inside thereof, wherein the unvulcanized belt formed between the core wire and the inner belt sleeve or the core. At one end in the axial direction of the belt sleeve between the wire and the outer belt sleeve, a ventilating member having air permeability is attached at the outer end in the axial direction of the belt sleeve. , It is characterized in that are interposed in a state in which a position close to the outside of the belt sleeve axial end of the unvulcanized belt moldings.

  According to this configuration, at one end in the axial direction of the belt sleeve between the core wire and the inner belt sleeve, or between the core wire and the outer belt sleeve, a deaeration member having air permeability is provided in the belt sleeve axial direction. Since the outer end is interposed in the unvulcanized belt molded body in a position closer to the outside than the axial end of the belt sleeve as the unvulcanized belt molded body, the jacket is vulcanized during the vulcanization process Even if a neck-tightening phenomenon occurs in which the upper and lower ends of the belt molded body are tightly tightened due to the diameter reduction deformation, the core wire portion and the belt are formed by the deaeration member existing between the inner belt sleeve and the outer belt sleeve in the radial direction. Communication with the outside of the body is maintained.

Therefore, it is possible to eliminate the air existing in the unvulcanized belt molded body and the concentration and remaining of bubbles around the core wire inside the belt, and the problem that a defective belt having bubbles inside occurs, the porous defect, Alternatively, it is possible to avoid various problems associated with the vulcanization treatment, such as occurrence of poor adhesion between the core wire and rubber.
That is, even if a neck-tightening phenomenon occurs due to the diameter reduction deformation of the jacket during the vulcanization process, the communication between the core wire portion and the outside of the belt molded body is maintained by the degassing member, resulting in poor porous or core. It is possible to contribute to providing a good belt without problems such as poor adhesion between the wire and rubber.

  Further, it is preferable that the deaeration member is a woven fabric or a nonwoven fabric, and is provided by being wound around at least one circumference of the unvulcanized belt molded body.

According to this preferred configuration, a predetermined time is required in the step of winding and mounting the core wire on the inner belt sleeve formed in a cylindrical shape, or in the step of laminating the outer belt sleeve on the wound core wire in a cylindrical shape. By wrapping a woven fork of a length or a non-woven fabric together, it is possible to equip it as an unvulcanized belt molded body, and to maintain the assembled state until the end of the subsequent vulcanization treatment. Can be.
In addition, since the deaeration member is made of cloth, cylindrical molding can be easily and easily performed with a small operating force, and air can be wound around the entire circumference as a non-vulcanized belt molded body from the entire circumference of 360 degrees. And gas components can be extracted quickly and satisfactorily, which contributes to realizing a quick and light vulcanization treatment.

  The rubber belt vulcanizing method of the present invention comprises an inner belt sleeve, an outer belt sleeve, and a core wire interposed between the two belt sleeves concentrically laminated to form an unvulcanized belt molded body, With a cylindrical mold disposed on the inner peripheral side of the inner belt sleeve and a cylindrical jacket disposed on the outer peripheral side of the outer belt sleeve, heating and pressurized fluid is supplied to the outer peripheral side of the jacket. A rubber belt vulcanizing method for vulcanizing the unvulcanized belt formed body by supplying and pressing from the outer periphery of the jacket, and supplying a heating fluid to the inside of the mold, wherein the core wire and the inner belt are At one end in the axial direction of the belt sleeve between the sleeve or the core wire and the outer belt sleeve, a ventilating member having air permeability is provided. The outer end in the axial direction of the belt sleeve is interposed so as to be located at a position closer to the outside than the axial end of the belt sleeve, and the vulcanizing treatment is performed via the jacket during the vulcanization treatment via the jacket. Thus, the communication between the core wire and the outside of the belt molded body is maintained.

  Another method for vulcanizing a rubber belt of the present invention includes forming a non-vulcanized belt molded body by laminating a belt sleeve and a core wire concentrically, and forming a cylindrical mold disposed on the inner peripheral side of the belt sleeve. With a tubular jacket disposed on the outer peripheral side of the belt sleeve, a heating and pressurizing fluid is supplied to the outer peripheral side of the jacket and pressed from the outer peripheral side of the jacket, and inside the mold. In the rubber belt vulcanization method of vulcanizing the unvulcanized belt formed body by supplying a heating fluid, one end in the belt sleeve axial direction between the core wire and the belt sleeve has air permeability. The deaeration member is interposed in such a state that the outer end in the belt sleeve axial direction is located closer to the outer side than the belt sleeve axial end as an unvulcanized belt formed body, and the jacket is provided. During the vulcanization process via, it is characterized in that in order to maintain the communication with the I'm going through the degassing member and the core wire material and the belt shaped body outside.

  According to these rubber belt vulcanization methods, even if a neck-tightening phenomenon occurs due to the diameter reduction deformation of the jacket during the vulcanization treatment, the communication between the core wire portion and the outside of the belt molded body is maintained by the degassing member. Thus, it is possible to contribute to the provision of a good belt having no problems such as poor porous or poor adhesion between the core wire and rubber.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows the vulcanizing apparatus K in which the unvulcanized rubber belt molded body 5 is set, and FIG. 2 shows the unvulcanized rubber belt molded body 5 used in the vulcanizing apparatus K. In the vulcanizing apparatus K and the unvulcanized rubber belt molded body 5, the same components as those of the conventional one shown in FIG. 7 described above are denoted by the same reference numerals, and therefore the description of the same parts is basically omitted. Shall be.

  The vulcanizing apparatus K is mainly for vulcanizing a double V-ribbed rubber belt DV (see FIG. 6), and is an unvulcanized rubber belt formed around an outer peripheral surface of a cylindrical mold 2. (An example of an unvulcanized belt sleeve) 5, a supporting assembly table (an example of a support table) 1 on which a mold assembly M formed by fitting a cylindrical rubber jacket 6 is mounted, and a mold assembly M. A first heat source mechanism N1 capable of freely supplying high-pressure steam (an example of a heated and pressurized fluid) to the outer peripheral side of the jacket 6 while equipping the vulcanizing can 7 with the upper lid 4 to be placed, and an internal space of the mold 2. And a second heat source mechanism N2 capable of supplying low-pressure steam.

  As a reference, the double V-ribbed rubber belt DV as a finished product has a core with an adhesive rubber layer interposed on both sides between an inner V rubber belt 5a and an outer V rubber belt 5c as shown in FIG. It has a cross-sectional structure in which wires 5b are arranged, and each V rubber belt is often formed in a toothed shape.

  The supporting assembling table 1 is configured by a horizontal circular plate-shaped body mounted and mounted on the upper surface of a receiving table 14 fixed to the lower inside of the cylindrical vulcanizing can 7. An introduction portion 13 that is just fitted into the mold 2 is fixed to the center portion, and a cylindrical bottom member 12 is attached below the center. The vulcanizing can 7 has a main body 7A having a high-pressure steam discharge port 9 formed in the center of the lower end, and a lid can that is detachably attached to the upper end of the main body 7A by screwing means or the like, and can be hermetically sealed when mounted. And a unit 7B.

  The first heat source mechanism N1 is provided with a high-pressure steam generation drive unit 15 and an inlet provided on a side surface at an upper end portion of the main body can 7A to supply the high-pressure high-temperature steam from the generation drive unit 15 into the vulcanization can 7. It is composed of a port 8 and the above-mentioned discharge port 9 and exerts a function of pressing the rubber jacket 6 in the diameter reducing direction.

  The second heat source mechanism N2 includes a high-temperature and low-pressure steam generation drive unit 16, an introduction pipe 10 mounted on the bottom member 12 for supplying the low-pressure and high-temperature steam from the generation drive unit 16 into the mold 2, and a discharge pipe 11 And has a function of supplying heat required for vulcanization to the unvulcanized rubber belt molded body 5 via the mold 2.

  As shown in FIG. 3, a flange 3 serving as a cover for covering an upper end opening portion of the mold 2 has a diameter larger than that of the mold 2 between an upper cover 4 serving as a cover of the mold assembly M and the mold 2. It is formed to have a diameter substantially equal to the maximum diameter of the belt sleeve 5a, and has a cut amount on the outer peripheral portion of the flange 3 from the outer periphery of the flange 3 toward the center so as not to communicate with the inner space of the mold 2. Further, a large number of flow grooves 17 penetrating in the axial direction of the mold 2 are formed. A large number of the flow grooves 17 are regularly arranged at regular intervals radially from the center of the flange 3 in plan view.

  With this configuration, the flange 3 is located at the upper end of the inner belt sleeve 5a, so that the upward movement of the unvulcanized belt molded body 5 can be stopped. The air and gas components can be maintained in a good discharging action.

  As shown in FIG. 1, one end communicates with a portion surrounded by a mold assembly M and a supporting assembly base 1, more specifically, a portion surrounded by a mold 2, an unvulcanized rubber belt molded body 5, a jacket 6, and the supporting assembly base 1. And a lower communication pipe (an example of a fluid path) 18 having the other end communicating with the atmosphere, the mold assembly M and the upper lid 4, more specifically, the mold 2, the unvulcanized rubber belt molded body 5, the jacket 6, and the upper lid 4. An upper communication pipe (an example of a fluid path) 19 is provided, one end of which communicates with the portion surrounded by.

  The upper communication pipe 19 is routed outside the vulcanizing can 7 through the upper lid 4 and the ceiling surface of the lid can 7B, and the lower communication pipe 18 is connected to the support assembly stand 1 and the main body can. It is arranged outside the vulcanizing can 7 through the bottom of 7A.

  Here, the unvulcanized rubber belt molded body 5 will be described. FIG. 2 shows the unvulcanized rubber belt molded body 5 fitted in the mold 2 with the flange 3. The unvulcanized rubber belt molded body 5 is formed by concentrically laminating an inner belt sleeve 5a made of a rubber material, an outer belt sleeve 5c made of a rubber material, and a core wire 5b interposed between the belt sleeves 5a and 5c. It is configured. As the core wire 5b, a cord having high strength and low elongation made of polyester fiber, aramid fiber, glass fiber or the like is used.

  At the upper end (an example of one end in the axial direction of the belt sleeve) and the lower end (an example of one end in the axial direction of the belt sleeve) between the core wire 5b and the outer belt sleeve 5c, a deaeration member 20 having air permeability is provided. The outer end in the belt sleeve axial direction is interposed so as to be located at a position closer to the outside than the belt sleeve axial end as the unvulcanized belt molded body 5. The inner and outer belt sleeves 5a and 5c are formed to have the same width dimension (axial dimension in the belt sleeve), and the core wire 5b is set to have a narrow width that is slightly retracted inward in both the upper and lower directions. ing.

  That is, as the air-permeable degassing member 20, a nonwoven fabric having a width of about 25 mm and being wound around the core wire 5b just once is selected, and the non-woven fabric is larger than the upper and lower ends of the outer belt sleeve 5c. They are provided at positions protruding upward and downward by about 5 mm, respectively. The pair of upper and lower nonwoven fabrics 20, 20 are formed by winding the unvulcanized belt formed body 5 sequentially around the outer periphery of the mold, that is, immediately before winding the outer belt sleeve 5c around the core wire 5b. By arranging them at the locations, they can be formed integrally with the unvulcanized belt molded body 5.

  Next, a vulcanizing step of performing a vulcanizing treatment using the above-described vulcanizing apparatus K and the double V-ribbed type unvulcanized rubber belt molded body 5 will be described. First, as shown in FIG. 1, a jacket 6 is fitted to an unvulcanized rubber belt molded body 5 having a mold 2 with a flange 3 to form a mold assembly M, and the mold assembly M is Are placed on the support assembly table 1 in an upright state, while being fitted to the introduction section 13.

  Next, the upper cover 4 is placed on the flange 3 and the jacket 6 so as to be in contact with the upper ends thereof, and then the first and second heat source mechanisms N1 and N2 are driven, and high-temperature and low-pressure steam is injected into the mold 2, and Then, high-temperature and high-pressure steam is supplied into the vulcanizing can 7, respectively. Then, the rubber jacket 6 is pressed from the outer peripheral side and is forcibly compressed in the direction of reducing the diameter, and the unvulcanized rubber belt molded body is heated and pressed while strongly pressing the outer belt sleeve 5c in the inner diameter direction. Sulfurize.

  At this time, as shown in FIG. 4, even if a neck-tightening phenomenon occurs in which the upper and lower ends of the jacket 6 are reduced in diameter, the outer diameter of the mold 2 in the supporting assembly table 1 is slightly larger than the outer diameter of the mold 2. When the jacket 6 is pushed to the mold 2 side by the lower communication pipe 18 disposed at the place where it is located and the upper communication pipe 19 through the flow groove 17 of the flange 3 whose upper end is tightly attached to the outer peripheral part of the jacket 6. In addition, surplus air and gas components or air around the core wire generated in a substantially closed space between the jacket 6, the mold 2, the upper lid 4, and the support assembly table 1 can be quickly released and extracted.

  As a result, there are inconveniences such as the occurrence of a defective belt having air bubbles therein, the above-mentioned porous defect caused by insufficient deaeration of the unvulcanized belt molded product, and the occurrence of a product defect due to a poor adhesion between the core wire and rubber. Can be avoided, and a good belt as a product can be produced.

  For reference, FIG. 5 shows the adhesive force between the core wire and the rubber (the inner and outer rubber belts) in each of the conventional belt and the belt using the vulcanizing apparatus and the unvulcanized belt formed body of the present invention. A bar graph is shown. From this bar graph, it can be understood that the belt according to the present invention has improved the adhesive strength between the core wire and rubber to twice or more the strength of the conventional belt.

  [Another Embodiment] The deaeration member 20 may be provided only at one of the upper end and the lower end of the unvulcanized belt molded body 5, or the communication pipes 18 and 19 may be provided only at one of the support assembly table 1 and the upper lid 4. The structure of equipping may be sufficient. Various types of belts to be vulcanized, such as a low-edge belt, a toothed belt, and a V-belt, are possible, and a state in which they are not vulcanized is generally referred to as an “unvulcanized belt sleeve”.

  Although it is specified for a so-called double V-ribbed rubber belt, a general rubber belt such as a V-belt having a rubber belt portion only inside the core wire also has a deaeration member 20 between the core wire and the belt sleeve. It is possible to interpose.

  That is, "an unvulcanized belt molded body formed by concentrically laminating a belt sleeve and a core wire, and having an air permeability at one end in the belt sleeve axial direction between the core wire and the belt sleeve. The unvulcanized member in which the outer end in the belt sleeve axial direction is located at a position closer to the outside than the belt sleeve axial end as an unvulcanized belt molded body. Belt molded body ".

  The operation and effect of the above configuration are as follows. The communication between the core wire portion and the outside of the belt molded body is maintained by the deaeration member, and a good belt having no problems such as poor porous or poor adhesion between the core wire and rubber. It can be created.

Sectional drawing which shows the vulcanizing apparatus in the state equipped with the unvulcanized belt molded object Sectional view showing an unvulcanized belt molded body having a mold Top view showing the shape of the flange Effect diagram showing the necking phenomenon due to the jacket during vulcanization The figure which shows the bar graph showing the adhesive force of a core wire and rubber Sectional view showing the structure of a double V-ribbed rubber belt Sectional view showing a conventional vulcanizing device

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Support stand 2 Mold 3 Flange 4 Top lid 5 Unvulcanized belt molded object 5a Inner belt sleeve 5b Core wire 5c Outer belt sleeve 6 Jacket 17 Flow groove 18, 19 Fluid path 20 Deaeration member M Mold assembly

Claims (4)

  An inner belt sleeve, an outer belt sleeve, and a core formed by concentrically laminating a core wire interposed between the two belt sleeves; and a cylindrical mold disposed on the inner peripheral side of the inner belt sleeve. With a tubular jacket disposed on the outer peripheral side of the outer belt sleeve, a heating pressurized fluid is supplied to the outer peripheral side of the jacket, and a heating fluid is supplied to the inside of the mold. An unvulcanized belt molded product of an endless belt used in a vulcanization apparatus capable of vulcanization processing, wherein the unvulcanized belt formed between the core wire and the inner belt sleeve, or between the core wire and the outer belt sleeve. One end of the belt sleeve in the axial direction is provided with a ventilating member having air permeability, and the outer end in the axial direction of the belt sleeve is provided with a belt as an unvulcanized belt molded body. Unvulcanized belt molded body are interposed in a state than Tosuribu axial end becomes a position closer to the outside.   2. The unvulcanized belt formed body according to claim 1, wherein the deaeration member is a woven cloth or a nonwoven cloth, and is provided by being wound around at least one circumference. The inner belt sleeve, the outer belt sleeve, and the core wire interposed between these belt sleeves are laminated concentrically to form an unvulcanized belt molded body,
With a cylindrical mold disposed on the inner peripheral side of the inner belt sleeve and a cylindrical jacket disposed on the outer peripheral side of the outer belt sleeve, a heated pressurized fluid is provided on the outer peripheral side of the jacket. In the rubber belt vulcanizing method of vulcanizing the unvulcanized belt molded body by supplying and pressing from the jacket outer peripheral side, and supplying a heating fluid to the inside of the mold, respectively.
At one end in the axial direction of the belt sleeve between the core wire and the inner belt sleeve, or between the core wire and the outer belt sleeve, a ventilating member having air permeability is attached in the belt sleeve axial direction. Interposed in a state where the outer end is located closer to the outside than the belt sleeve axial end,
A method of vulcanizing a rubber belt, comprising: maintaining the communication between the core wire and the outside of the belt molded body via the deaeration member during the vulcanization treatment via the jacket. A belt sleeve and a core wire are concentrically laminated to form an unvulcanized belt molded body, and a cylindrical mold disposed on an inner peripheral side of the belt sleeve and disposed on an outer peripheral side of the belt sleeve. With the cylindrical jacket provided, a heated and pressurized fluid is supplied to the outer peripheral side of the jacket to press it from the outer peripheral side of the jacket, and the heated fluid is supplied to the inside of the mold, respectively. In a rubber belt vulcanization method for vulcanizing a vulcanized belt molded body,
At one end in the axial direction of the belt sleeve between the core wire and the belt sleeve, a ventilating member having air permeability, and the outer end in the axial direction of the belt sleeve, a belt sleeve as an unvulcanized belt molded body Interposed at a position closer to the outside than the axial end,
A method of vulcanizing a rubber belt, comprising: maintaining the communication between the core wire and the outside of the belt molded body via the deaeration member during the vulcanization treatment via the jacket.

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