JP5425873B2 - Production method of unvulcanized rubber sheet - Google Patents

Description

  The present invention relates to a method for producing an unvulcanized rubber sheet produced using an insulation calendar.

  FIG. 3 is a diagram for explaining a conventional method for producing an unvulcanized rubber sheet. As shown in FIG. 3, the production of a conventional unvulcanized rubber sheet is performed using an apparatus called an installation calendar.

  The installation calendar includes a calendar unit 10, a pull roll unit 20, a cooling unit 30, and a winding unit 40. The production of unvulcanized rubber sheets is made by processing high-temperature unvulcanized rubber into unvulcanized rubber sheets. A calendar process, a pull roll process in which a plurality of sheet-processed unvulcanized rubbers are bonded with a pull roll and then cooled, a cooling process in which the bonded unvulcanized rubber sheet S is further cooled, and cooled unvulcanized It is performed through a winding process in which the rubber sheet S is wound around a winding roll and a cutting process in which the wound unvulcanized rubber sheet S is cut by a cutter 49 (Patent Document 1).

  Then, one end of the cut unvulcanized rubber sheet S is wound as it is on a winding roll, while the other end is wound on a new winding roll, and a new winding is started. Thus, by exchanging the two winding rolls, continuous production of the unvulcanized rubber sheet is performed without stopping the line.

  In each of the above steps, an appropriate speed is set so that the unvulcanized rubber sheet S does not sag or wrinkle. The pull roll process may be omitted depending on the product.

JP 2010-173223 A

  However, in the conventional method, when the unvulcanized rubber sheet S after being cut is wound on a new winding roll, the sheet width becomes wide at the portion of the length of about 10 m of the winding core portion. The accuracy sometimes deteriorated. Thus, the unvulcanized rubber sheet S whose width accuracy is deteriorated may cause a problem in use in the next process such as automatic molding, and may increase the occurrence of tire defects in the product tire.

  However, conventionally, the cause of the widening of the sheet was unknown, so that it was not possible to cope with it appropriately.

  Therefore, the present invention suppresses the occurrence of deterioration in width accuracy when the unvulcanized rubber sheet cut after being wound by the winding roll is wound on a new winding roll, and in the next step It is an object of the present invention to provide a method for producing an unvulcanized rubber sheet that can be used without any problem and can reduce the occurrence of tire defects in a product tire.

  As a result of intensive studies, the present inventor has found that the above problems can be solved by the invention described below, and has completed the present invention.

The invention described in claim 1
A calendar process for processing high-temperature unvulcanized rubber into an unvulcanized rubber sheet, a cooling process for cooling the unvulcanized rubber sheet, and a winding for winding the cooled unvulcanized rubber sheet on a winding roll A method for producing an unvulcanized rubber sheet, comprising a removing step and a cutting step for cutting the unvulcanized rubber sheet after completion of winding,
When the cooled unvulcanized rubber sheet after completion of the cutting step is wound on the next winding roll, the predetermined length of the tip is wound at a winding speed higher than the normal winding speed. Is a method for producing an unvulcanized rubber sheet.

The invention described in claim 2
The method for producing an unvulcanized rubber sheet according to claim 1, wherein the winding speed faster than the normal winding speed is a winding speed that is 2-3% faster than the normal winding speed. It is.

  According to the present invention, the uncured rubber sheet that has been cut after being wound by the winding roll is restrained from being deteriorated in width accuracy when wound on a new winding roll, in the next step. Therefore, it is possible to provide a method for producing an unvulcanized rubber sheet that can be used without any problem and can reduce the occurrence of tire defects in a product tire.

It is a figure explaining the production method of the unvulcanized rubber sheet of embodiment of this invention. It is a figure explaining the production method of the unvulcanized rubber sheet of embodiment of this invention. It is a figure explaining the production method of the conventional unvulcanized rubber sheet.

  In the conventional method, when the unvulcanized rubber sheet after being cut is wound around a new winding roll in the conventional method, by being cut, the difference in speed between the cooling step and the winding step is obtained. It can be seen that the generated tension is canceled and the sheet width is widened, and this canceled tension is compensated by increasing the speed of the new winding roll to suppress the spread of the sheet width. .

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

  1 and 2 are views for explaining a method for producing an unvulcanized rubber sheet according to an embodiment of the present invention. The production method of the unvulcanized rubber sheet of the present embodiment is performed using the same installation calendar as shown in FIGS.

1. Configuration of Installation Calendar As described above, the installation calendar includes the calendar unit 10, the pull roll unit 20, the cooling unit 30, the winding unit 40, the cutter 49, and a control unit (not shown) for controlling these components, and driving means for each unit. The (motor) is controlled by the control unit.

  The insulation calendar is usually configured to roll an unvulcanized rubber sheet S having a thickness of 0.3 to 3.0 mm, cool it, and wind it.

  The conveying speed of the unvulcanized rubber sheet S in each part of the calendar unit 10, the pull roll unit 20, the cooling unit 30, and the winding unit 40 is configured to be set independently, and the calendar of the unvulcanized rubber sheet S is configured. When the speed at the section 10 is 100, the speed at the pull roll section 20, the cooling section 30, and the winding section 40 can be set at 90 to 110, respectively.

  The calendar unit 10 is a device that rolls high-temperature unvulcanized rubber and processes it into an unvulcanized rubber sheet S. The first unvulcanized rubber is rolled by the first calendar device 11. The sheet S1 is processed, and an unvulcanized rubber having a different composition from the first unvulcanized rubber sheet S1 is rolled by the second calender device 12 to form a second unvulcanized rubber sheet S2.

  The pull roll unit 20 is an apparatus that forms the unvulcanized rubber sheet S by bonding the first and second unvulcanized rubber sheets S1 and S2. Reference numeral 21 denotes a joining roller.

  The cooling unit 30 is configured by arranging the cooling drums 31 to 36 in two upper and lower rows, and moving the unvulcanized rubber sheet S while folding the front and back surfaces of the unvulcanized rubber sheet S to the cooling drums 31 to 36. To cool alternately.

  The cooling unit 30 may be constituted by a front cooling unit and a rear cooling unit, and the pull roll unit 20 may play the role of the front cooling unit.

  The winding part 40 is for the first auxiliary material roll 51 and the first auxiliary material roll 51 wound with the first auxiliary material 51a and the second auxiliary material material 52a wound with the second auxiliary material 52a. A roll 52 and a second winding roll 44 are provided. Reference numerals 41 and 42 denote a first roller and a second roller for driving the belt.

  In the case of changing to the next auxiliary material in the winding unit 40 for continuous production, that is, when starting a new winding with a new winding roll (first change), FIG. Thus, the cutter 49 is lowered and the unvulcanized rubber sheet S is cut. Next, as shown in FIG. 2B, the cutter 49 is raised, the rotation of the first auxiliary material roll 51 and the first winding roll 43 is stopped, and the first winding roll 43 is further lifted from the belt. . Further, the second auxiliary material roll 52 and the second winding roll 44 are rotated, and the second winding roll 44 is further lowered to the position of the belt to wind up the unvulcanized rubber sheet S.

  The next second change is to stop the rotation of the second auxiliary material roll 52 and the second winding roll 44 and rotate the first auxiliary material roll 51 and the first winding roll 43. Then, it is wound up by the first winding roll 43. In the third and subsequent times, the unvulcanized rubber sheet S is wound up by alternately changing the auxiliary material roll and the winding roll in the same manner.

2. Method for Producing Unvulcanized Rubber Sheet A method for producing an unvulcanized rubber sheet according to the present embodiment is a method for producing an unvulcanized rubber sheet S using the above installation calendar. The unvulcanized rubber is processed into first and second unvulcanized rubber sheets S1 and S2, and the first and second unvulcanized rubber sheets S1 and S2 are bonded to each other in the pull roll 20 A process for processing the vulcanized rubber sheet S, a cooling process for cooling the unvulcanized rubber sheet S in the cooling unit 30, and a winding for winding the unvulcanized rubber sheet S cooled in the winding unit 40 on a winding roll. And a cutting step of cutting the end of the unvulcanized rubber sheet S wound up in the winding step with a cutter 49.

  In the production method of the unvulcanized rubber sheet, the conveyance speed of each part is a ratio of calendar part: pull roll part (front cooling part): cooling part (rear cooling part): winding part = 100: 102: 98: 100 Is set as follows.

  In the present embodiment, winding of the unvulcanized rubber sheet S by the winding roll is finished, and the winding speed of the unvulcanized rubber sheet S when changing to a new winding roll is changed. The change is made as follows.

(1) Until immediately before the winding of the unvulcanized rubber sheet S is changed, the unvulcanized rubber sheet S is wound at a normal winding speed.

(2) When starting winding with a new winding roll, the winding speed is changed to a higher winding speed than the normal winding speed. That is, after the winding by the first winding roll 43 is completed as shown in FIG. 2 (a), the cutter 49 is lowered to cut the unvulcanized rubber sheet S, and then as shown in FIG. 2 (b). When starting winding from the cut start end (tip portion) of the unvulcanized rubber sheet S by the second winding roll 44, a predetermined length (for example, 10 m) is wound from the cut start end of the vulcanized rubber sheet S. Until unwinding, the unvulcanized rubber sheet S is wound at a winding speed that is 2 to 3% faster than the winding speed until the unvulcanized rubber sheet S is cut (normal winding speed).

  As a result, the vulcanized rubber sheet S having an increased sheet width is subjected to an appropriate tensile force that is greater than the tensile force at the normal winding speed, and is wound while returning the sheet width to an appropriate size. Can be taken.

(3) Thereafter, the unvulcanized rubber sheet S is wound up by returning to the normal winding speed.

  Using the above installation calendar, perform the first winding at normal calendar speed, pull roll speed, cooling speed, and winding speed, and then change the winding roll and compare as shown in Table 1. The second winding was performed at a normal winding speed in the example, and at five winding speeds higher than the normal winding speed in the example.

  And the rate of increase (R / average value) (%) of the width of the rubber sheet near the winding start end in the second winding, trouble occurrence rate (%) in the automatic molding machine used in the next process, tire defect The occurrence rate (%) of was measured. The results are shown in Table 1.

  From Table 1, in the case of Examples 3 and 4 in which the winding speed at the time of winding change (at the time of cutting) was increased by 2 to 3%, the rate of increase in the rubber sheet width (R / average value), automatic It can be seen that both the trouble occurrence rate (%) in the molding machine and the tire defect occurrence rate (%) are greatly improved as compared with the comparative example.

  Note that the calendar speed, pull roll speed, cooling speed, winding speed, and speed at the time of winding change in the table are expressed as relative ratios when the winding speed before the winding change is 100. In the table, “R” of R / average value (%) of the rubber sheet width is a difference between the maximum width and the minimum width of the unvulcanized rubber sheet S wound up, and the “average value” is the winding value. It is the average width of the unvulcanized rubber sheet S taken.

  While the present invention has been described based on the embodiments, the present invention is not limited to the above embodiments. Various modifications can be made to the above-described embodiments within the same and equivalent scope as the present invention.

DESCRIPTION OF SYMBOLS 10 Calendar part 11 1st calendar apparatus 12 2nd calendar apparatus 20 Pull roll part 21 Joining roller 30 Cooling part 31-36 Cooling drum 40 Winding part 41 1st roller 42 2nd roller 43 1st winding roll 44 2nd Winding roll 49 cutter 51 first auxiliary material roll 51a first auxiliary material 52 second auxiliary material roll 52a second auxiliary material S unvulcanized rubber sheet S1 first unvulcanized rubber sheet S2 first One unvulcanized rubber sheet

Claims (2)

A calendar process for processing high-temperature unvulcanized rubber into an unvulcanized rubber sheet, a cooling process for cooling the unvulcanized rubber sheet, and a winding for winding the cooled unvulcanized rubber sheet on a winding roll A method for producing an unvulcanized rubber sheet, comprising a removing step and a cutting step for cutting the unvulcanized rubber sheet after completion of winding,
When the cooled unvulcanized rubber sheet after completion of the cutting step is wound on the next winding roll, the predetermined length of the tip is wound at a winding speed higher than the normal winding speed. A method for producing an unvulcanized rubber sheet.   The method for producing an unvulcanized rubber sheet according to claim 1, wherein the winding speed faster than the normal winding speed is a winding speed that is 2-3% faster than the normal winding speed. .

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