JP4199447B2 - Method and apparatus for forming rubber canvas - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a calender roll machine for gluing unvulcanized rubber to the surface of a base fabric, and more specifically, used for gluing work such as crimping or rubbing a thin layer of unvulcanized rubber to the base fabric surface. The present invention relates to a method for keeping constant the tension applied in the width direction of the base fabric when the base fabric is inserted.
[0002]
[Prior art]
Conventionally, in order to perform a gluing operation such as an operation of pressing a thin layer of unvulcanized rubber on both sides of a suede or woven fabric base fabric (hereinafter referred to as coating) using a calendar roll machine, first, the base fabric Widely adopted is a means of gluing unvulcanized rubber on one side and then winding it up once, and then repeating the same process to glue the unvulcanized rubber on the other side of the base fabric to adhere and integrate.
[0003]
For example, as illustrated in FIG. 1, when uncured rubber is frictioned on the base fabric surface by a calendar roll machine 1 in which three roll groups are arranged in the vertical direction, a narrow gap is formed between the upper and lower rolls. Among the three rolls arranged and arranged, that is, the top roll 2, the center roll 3, and the bottom roll 4, unvulcanized rubber is stored between the top roll 2 and the center roll 3, and with the rotation of the center roll 3, A thin layer 10 of unvulcanized rubber is formed along the surface of the center roll 3, the unvulcanized rubber thin layer is pulled out between the center roll 3 and the bottom roll 4, and at the same time, a base fabric is provided between the center roll 3 and the bottom roll 4. After passing the base fabric 9 pulled out from the supply roll 7 while applying a predetermined tension, the thin layer 10 of unvulcanized rubber is rubbed on one side surface of the base fabric 9 on the bottom roll 4 and is not shown once. roll Winding with a take-up roll, and then repeating the same operation, the unvulcanized rubber is frictioned on the other side of the base fabric, this is cooled, and the unvulcanized rubber is adhered to the base fabric surface. ing.
[0004]
[Problems to be solved by the invention]
However, in the conventional coating method, since the center cloth 3 and the bottom roll 4 are passed from the base cloth 9 without passing the fixed roll or the like, the brake is applied only by the shaft 13 that supports the base cloth 9. However, in this brake system, it is necessary to increase the braking force by the shaft 13, and the tension applied to the base fabric is different at the center and the outermost winding of the base fabric at the time of coating. As a result, the shrinkage stress of the warp yarn is uneven and the weft yarn is undulated, and the thrust force of the product is increased when the product is manufactured.
[0005]
In view of the above-mentioned points, the present invention provides a method for forming a rubber canvas with no tension difference due to the tension in the width direction of the base fabric and the winding diameter when the base fabric is inserted into a calendar roll, and an apparatus therefor. It is intended.
[0006]
[Means for Solving the Problems]
The present invention provides a method for forming a canvas with rubber, in which a base cloth is supplied from a base cloth supply roll to a calendar roll through at least two guide rolls, and unvulcanized rubber is glued to the base cloth . By moving the guide roll in parallel with the direction of entry of the base fabric into the calendar roll machine, the angle of the base fabric wrapping around the other guide roll is varied, so that the friction force between the base fabric and the guide roll is applied to the calendar roll. There is a method of forming a canvas with rubber that adjusts the tension applied to the base fabric during supply.
[0007]
According to the first aspect of the present invention, by moving one of the guide rolls in parallel with the direction in which the base cloth enters the calendar roll machine, the angle of wrapping the base cloth around the other guide roll is varied. Thus, a method for forming a canvas with rubber that adjusts the tension applied to the base cloth when it is supplied to the calendar roll by the frictional force between the base cloth and the guide roll, and the difference in tension in the width direction of the base cloth, and the base There is no difference in tension due to the winding diameter of the fabric.
[0008]
The invention according to claim 2 is the method for forming a canvas with rubber according to claim 1, wherein a minimum braking force is applied to the base fabric supply roll.
[0009]
According to the second aspect of the present invention, the base cloth supply roll is applied with a minimum braking force, so that the base cloth supply roll is not subjected to any force. Because there is no tension, the variation in tension due to the winding diameter and the difference in tension in the width direction of the canvas can be minimized.
[0010]
The invention according to claim 3 is an apparatus for forming a canvas with rubber, in which the base fabric is supplied from the base fabric supply roll to the calendar roll through at least two guide rolls, and the unvulcanized rubber is glued to the base fabric. By moving the position of the guide roll parallel to the direction in which the base cloth enters the calender roll machine, the friction between the base cloth and the guide roll is adjusted by adjusting the winding angle of the base cloth wound around the other guide roll. There is a rubber-equipped canvas molding device that can adjust the tension applied to the base fabric when it is fed to the calendar roll.
[0011]
According to invention of Claim 3, the winding angle of the base fabric wound around the other guide roll is adjusted by moving the position of one guide roll in parallel with the approach direction to the calender roll machine of a base fabric. Thus, by using a rubberized canvas molding apparatus that can adjust the tension applied to the base fabric when fed to the calendar roll by the frictional force between the base fabric and the guide roll, the tension of the base fabric can be easily adjusted, The tension difference in the width direction of the base fabric and the tension difference due to the winding diameter of the base fabric do not occur.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below.
FIG. 1 is a schematic front view of a calender device in the case of friction of unvulcanized rubber on a base fabric using a calender roll machine in which three rolls are arranged in the vertical direction. In the vertical direction, the rolls are arranged in parallel between the rolls, that is, between the top roll 2 and the center roll 3 with a device not shown in the drawing in advance. The unvulcanized rubber 6 which has been blended, kneaded and heated is supplied to the rolls 2 and 3 in the biting direction, and the unvulcanized rubber 6 temporarily stored between the rolls 2 and 3 is stored. Is pulled out between the center roll 3 and the bottom roll 4 as a thin layer 10 of unvulcanized rubber in which the center roll 3 is substantially half-wound along the surface of the center roll 3 while rolling with the rotation of both rolls. . On the other hand, a base fabric 9 drawn from a base fabric supply roll 7 is supplied between the center roll 3 and the bottom roll 4 through a first guide roll 11 and a second guide roll 12 under a low tension. 3 and the bottom roll 4, the thin layer 10 of the unvulcanized rubber is rubbed and adhered to one side surface of the base fabric 9 passing through the portion, and then temporarily attached to the take-up roll via a guide roller (not shown). Wind up. A part of the unvulcanized rubber remaining without adhering to the surface of the base fabric 9 adheres to the surface of the center roll 3 and is refluxed. Next, the same operation is repeated to rub the unvulcanized rubber on the other side of the base fabric 9 and cool it to obtain an adhesive paste in which the unvulcanized rubber is adhered and integrated on both sides of the base fabric.
[0015]
Here, the base fabric 9 is supplied from the base fabric supply roll 7 to the calender roll machine 1 through at least two guide rolls. However, as shown in FIG. After being wound around one guide roll 11, it is wound around a second guide roll 12 and inserted into the calendar roll machine 1.
[0016]
Here, by moving the second guide roll 12 parallel to the direction in which the base cloth 9 enters the calender roll machine 1, the winding angle of the base cloth 9 around the first guide roll 11 can be varied, and accordingly. Since the frictional force between the first guide roll 11 and the base cloth 9 also changes, the frictional force of the first guide roll 11 on the base cloth 9 serves as a brake to the base cloth 9.
[0017]
By doing so, the brake applied to the base fabric supply roll 7 may be a minimum force, and the tension applied in the width direction of the base fabric 9 and the tension difference due to the winding diameter can be eliminated.
[0018]
【Example】
Next, the present invention will be specifically described with reference to examples.
(Example)
The base fabric 9 was supplied from the base fabric supply roll 7 to the first guide roll 11. The winding angle α of the base fabric 9 on the first guide roll 11 at this time was 155 degrees. Next, after the base fabric 9 was supplied to the second guide roll 12, the base fabric 9 was supplied to the calendar roll machine 1. Here, the shrinkage stress of the base fabric was measured at each position of the belt width between the base fabric supply roll 7 and the first guide roll 11. As conditions, the shrinkage stress when the 4% base fabric was stretched was measured. The shrinkage stress at the center in the width direction of the base fabric was 0.1 KN. FIG. 2 shows the result of setting the central portion to 100 at each position.
[0019]
Then, the base fabric 9 is subjected to friction and coating with the calender roll machine 1, and a belt sleeve is formed, vulcanized and cut into a predetermined width using the canvas coated with the rubber paste, and the toothed belt 106MY25. Got.
[0020]
A lateral runout test was conducted using the above-mentioned toothed belt. Suspended between a 24-tooth drive pulley and a driven pulley of a flat pulley, applied a load of 350 N to the driven pulley, rotated the belt twice, and then measured the amount of movement of the belt in the width direction during one rotation of the belt did. At this time, if the belt moved 0.6 mm, it was regarded as defective. As shown in FIG. 4, the defective rate per month in the example was stable at about 0.2%.
[0021]
(Conventional example)
The base fabric 9 was supplied directly from the base fabric supply roll 7 to the calendar roll machine 1. At this time, the torque applied to the base fabric supply roll 7 was 5 KN. At this time, the shrinkage stress of the base fabric measured at the center in the width direction of the base fabric 9 between the calender roll machine 1 and the base fabric supply roll 7 was 0.1 KN when 4% stretched. It was. Then, when the shrinkage stress was measured at an arbitrary position in the width direction of the base fabric 9, if the central portion is set to 100, the result shown in FIG. 3 is obtained, and the shrinkage stress increases toward the end in the width direction of the base fabric. You can see that
[0022]
Further, lateral runout was measured using a belt manufactured by a conventional apparatus under the same conditions as in the example. The result at this time is shown in FIG. It can be seen that the conventional example has a lateral shake defect rate of 5 times or more as compared with the example.
[0023]
【The invention's effect】
As described above, the present invention is applied to the base fabric when supplied to the calendar roll by the frictional force between the base fabric and the roll by adjusting the winding angle of the base fabric wound around one of the guide rolls. By using the method for forming a canvas with rubber characterized by adjusting the tension, there is an effect that a difference in tension in the width direction of the base fabric and a difference in tension due to the winding diameter of the base fabric do not occur.
[0024]
According to the invention described in claim 2, the wrapping angle of the base fabric around the one guide roll is enabled by allowing the base fabric to move in the direction of entering the calendar roll of the other roll of the guide rolls. Therefore, there is an effect that the frictional force applied to the base fabric can be adjusted with certainty.
[0025]
According to the third aspect of the present invention, the base cloth supply roll has a force applied to the base cloth supply roll by using the method for forming a rubberized canvas according to claim 1 or 2 in which a minimum braking force is applied to the base cloth supply roll. Therefore, there is an effect that the variation in the tension due to the winding diameter and the difference in the tension in the width direction of the canvas can be made as small as possible.
[0026]
According to the invention described in claim 4, by adjusting the winding angle of the base fabric wound around the other guide roll by making the position of one guide roll variable, the frictional force between the base fabric and the guide roll. This is an apparatus for forming a canvas with rubber that can adjust the tension applied to the base fabric when it is fed to the calendar roll, so that the tension of the base fabric can be easily adjusted, and the tension difference in the width direction of the base fabric, There is an effect that there is no difference in tension due to the winding diameter.
[Brief description of the drawings]
FIG. 1 is a schematic front view of a calendar device of the present invention.
FIG. 2 is a diagram showing shrinkage stress at a position in the width direction of the base fabric in the molding method of the present invention. (The center of the base fabric is 100)
FIG. 3 is a view showing shrinkage stress at a position in the width direction of a base fabric in a conventional forming method. (The center of the base fabric is 100)
FIG. 4 is a graph in which the lateral runout failure rate of a belt molded by the method of the present invention is investigated over time.
FIG. 5 is a graph in which a lateral runout failure rate of a belt formed by a conventional method is examined over time.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Calendar roll machine 2 Top roll 3 Center roll 4 Bottom roll 6 Unvulcanized rubber 9 Base cloth 10 Thin layer 11 of unvulcanized rubber 1st guide roll 12 2nd guide roll 13 Axis

Claims (3)

In a method for forming a canvas with rubber, in which a base fabric is supplied from a base fabric supply roll to a calendar roll through at least two guide rolls and unvulcanized rubber is glued to the base fabric, one of the guide rolls is used as a base roll. By moving the cloth in parallel with the direction of entry into the calendar roll machine, the base cloth winding angle to the other guide roll is varied to change the base force at the time of supply to the calendar roll by the frictional force between the base cloth and the guide roll. A method for forming a canvas with rubber, characterized by adjusting a tension applied to the cloth. 2. The method for forming a canvas with rubber according to claim 1, wherein a minimum braking force is applied to the base fabric supply roll. In a rubber-equipped canvas molding device that supplies base fabric to a calendar roll through at least two guide rolls from a base fabric supply roll and pastes unvulcanized rubber to the base fabric, the position of one guide roll is set to the calendar of the base fabric By adjusting the wrapping angle of the base fabric wound around the other guide roll by moving it parallel to the direction of entry into the roll machine, the base at the time of supply to the calendar roll by the frictional force between the base fabric and the guide roll is adjusted. An apparatus for forming a canvas with rubber, wherein tension applied to the cloth can be adjusted.

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