JP2008126502A - Method and apparatus for producing rubber sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent air incorporation during kneading when a rubber material is kneaded and rolled to produce a rubber sheet. <P>SOLUTION: The rubber material G1 is extruded from a rubber extruder which is not illustrated and fed to a kneading roll apparatus 1. The rubber material G1 is kneaded by being squeezed by the rolls arranged to face each other of the kneading roll apparatus 1 to be taken out as rubber G2. Kneading by the kneading roll apparatus 1 is carried out by being squeezed and conveyed by the opposite rolls, not like in a conventional kneader in which kneading is carried out by repeatedly rotating a bank retained in the valley between rolls. Therefore, the incorporation of air is prevented in the kneading roll apparatus 1. The rubber G2 is molded into the rubber sheet G4 of a prescribed thickness by the nip 10 arranged between the rolls 2 and 3 of a rolling roll apparatus 4. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rubber sheet manufacturing apparatus and manufacturing method, and more particularly, to a rubber sheet manufacturing apparatus and manufacturing method that prevent air from being caught when kneading rubber dough.

  The rubber sheet manufacturing apparatus for molding a rubber material into a rubber sheet having a predetermined thickness after kneading the rubber material is used for manufacturing a tire constituting member such as an inner liner rubber and sidewall rubber, a conveying member such as a rubber belt and a rubber roller, A rubber sheet manufacturing apparatus and a manufacturing method therefor have been proposed in Patent Document 1.

A conventional rubber sheet manufacturing apparatus and manufacturing method will be described with reference to FIG.
First, the configuration of the rubber sheet manufacturing apparatus will be described with reference to FIG.
The rubber sheet manufacturing apparatus includes a rubber kneading roll machine 33 including a fixed roll 31 and a moving roll 32. The fixed roll 31 has a horizontal axis, is connected to driving means (electric motor, speed reducer, etc.) (not shown), and can rotate in the direction of arrow y (clockwise). The axis of the moving roll 32 is parallel to the axis of the fixed roll 31, and can move toward and away from the axis of the fixed roll 31. Further, it can rotate in conjunction with the fixed roll 31 in the direction of the arrow z (counterclockwise). The fixed roll 31 and the moving roll 32 can be heated or cooled by hot water or cold water supplied to the inside, and a predetermined roll gap (nip) 34 is provided between both rolls.

  A width direction cutter 36 supported by the support 35 is attached to the lower part of the fixed roll 31 so as to be able to contact and be separated. A pair of the width direction cutters 36 are arranged in the width direction of the fixed roll 31 with a predetermined interval set by the width of the rubber sheet to be manufactured. Above the vicinity of the width direction cutter 36, a take-off roll 37 whose axis is parallel to the axis of the fixed roll 31 is disposed. The take-off roll 37 is a roll that also serves as a reference for measuring the thickness of the rubber sheet cut out by the widthwise cutter 36, and has a function of taking the rubber sheet in contact with the upper surface thereof and feeding it to the first conveyor 39. Above the take-off roll 37, a thickness sensor 38 is provided so as to be able to approach and separate from the take-off roll 37.

  The rubber sheet manufacturing apparatus includes a conveying means 42 including a first conveyor 39, a second conveyor 40, and a guide roll 41. The guide roll 41 is located above the downstream end of the second conveyor 40. The movable roll 32 is provided so as to be in contact with and separated from the movable roll 32. The transport means 42 has a function of transporting the rubber sheet taken up by the take-off roll 37 from the fixed roll 31 by the first conveyor 39 and the second conveyor 40 without changing the dimensions.

  The rubber sheet manufacturing apparatus further includes a winding means 43 including a winding shaft 43, a liner roll 44, and a winding stand 45. Here, the winding shaft 43 is attached to the upper part of the winding stand 45, and the liner roll 44 is attached to the lower part of the winding stand. Further, the winding stand 45 is configured to move in the left-right direction in the drawing so as to be able to approach and separate from the outer peripheral surface of the moving roll 32, and when it approaches, the winding shaft 43 is brought into contact with the moving roll 32. Can do.

Next, the rubber sheet manufacturing procedure will be described.
The first step shown in FIG. 4 (a) is a process of heat mixing, that is, heating and mixing until a temperature capable of rubber rolling is reached. The fixed roll 31 and the moving roll 32 constituting the roll machine 33 are moved in the directions of arrows y and z. And adjusting the outer peripheral surfaces of both rolls to a predetermined temperature, and then supplying unvulcanized rubber between the upper valleys to form the bank 47. The unvulcanized rubber bank 47 is rotated by rolls 31 and 32, rolled into a sheet at a nip 34, and circulated as a return rubber 48 along the fixed roll 31 to the bank 47. In this way, it is repeatedly kneaded and softened and wound around the fixed roll 31. In this step, the guide roll 41 and the winding means 46 are separated from the moving roll 32. Further, the width direction cutter 36, the take-off roll 37, the thickness sensor 38, and the conveying means 42 are not operated.

  The second step shown in FIG. 4 (b) is a process for making the thickness and width of the rubber sheet 49. The take-off roll 37, the first conveyor 39 and the second conveyor 40 are started, and the fixed roll 31 is set at a temporary thickness. The rubber sheet 49 wound around is cut into a predetermined width by the width direction cutter 36, cut out from the fixed roll 31, and taken up on the upper surface of the take-off roll 37. The rubber sheet 49 is continuously taken up on the upper surface of the second conveyor 40 through the first conveyor 39 and conveyed to the lower side of the moving roll 32. Further, the guide roll 41 is brought into contact with the moving roll 32 and the rubber sheet 49 is guided to the upper surface of the guide roll 41 so that the rubber sheet 49 is pressed against and attached to the outer peripheral surface of the moving roll 32 and joins the bank 47. To do. At this time, since the rubber sheet 49 is supplied while being attached to the outer peripheral surface of the moving roll 32, the rubber sheet 49 is supplied to the entire width of the bank 47, and the thickness of the rubber sheet 49 becomes uniform in the width direction.

  As a result, the rubber sheet 49 is separated from the fixed roll 31, moved in the order of the take-off roll 37, the first conveyor 39, the second conveyor 40, the guide roll 41, and the moving roll 32, and supplied to the bank 47. Form. While repeating this series of steps, the thickness sensor 38 is brought close to the take-off roll 37, and the thickness of the rubber sheet 49 is measured. According to this measurement data, the rubber sheet 49 is adjusted to a predetermined thickness by an adjusting means (not shown).

The third step shown in FIG. 4 (c) is a step of winding the rubber sheet 49 molded to a predetermined thickness and width. After the second step is completed, the roll machine 33, the conveying means 42, etc. are stopped simultaneously. Then, the winding shaft 43 of the winding means 46 is brought into contact with the rubber sheet 49 attached to the moving roll 32. Next, the roll machine 33 and the conveying means 42 are restarted, and the rubber sheet 49 cut out by the width direction cutter 36 to the conveying means 42 is taken up on the take-up shaft 43. At this time, as a means for preventing adhesion of the rubber sheet 49, the liner 50 fed out from the liner roll 44 is continuously sandwiched.
JP 2002-326245 A

  However, in the conventional rubber sheet manufacturing apparatus described above, in the heating procedure shown in FIG. 4 (a), air is blown when the bank 47 repeats rotation in the valleys formed on the upper surfaces of the fixed roll 31 and the movable roll 32. By biting, air is mixed in the rubber sheet 49 after rolling. In particular, in the case of a rubber having low air permeability even when not vulcanized, such as a rubber for an inner liner, a large amount of air is mixed, which may result in a defective product in which air is mixed even after vulcanization.

  The present invention has been made to solve such problems, and its purpose is to prevent air from being caught during kneading when a rubber sheet is kneaded and rolled to produce a rubber sheet. is there.

The invention according to claim 1 is composed of a plurality of kneading rolls, and kneaded by the kneading roll device for kneading the supplied rubber while conveying the rubber along the outer peripheral surface of the kneading roll, and kneaded by the kneading roll device. A rubber sheet manufacturing apparatus comprising a rolling roll device that rolls rubber to form a rubber sheet.
The invention according to claim 2 is the rubber sheet manufacturing apparatus according to claim 1, further comprising means for adjusting the surface temperature of the kneading roll.
The invention according to claim 3 is the rubber sheet manufacturing apparatus according to claim 1, further comprising conveying means for supplying the kneading roll apparatus with the rubber sheet molded by the rolling roll apparatus. Device.
The invention according to a fourth aspect is the rubber sheet manufacturing apparatus according to the first aspect, further comprising means for changing a gap between opposing rolls of the kneading roll device.
The invention according to claim 5 is the step of rotating a plurality of kneading rolls facing each other, supplying rubber to the outer peripheral surface of the kneading roll, and kneading the rubber with the outer peripheral surface of the kneading roll. A method for producing a rubber sheet, comprising: a step of conveying; and a step of molding the rubber unloaded from the kneading roll into a sheet shape by a rolling roll.

(Function)
According to the inventions according to claims 1 and 5, the rubber is kneaded by pressing while conveying the rubber along the outer peripheral surfaces of the plurality of kneading rolls, and then the kneaded rubber is rolled to obtain a sheet. Mold into a shape.
According to the invention which concerns on Claim 2, the temperature of the outer peripheral surface of the roll for kneading | mixing is adjusted to the temperature suitable for kneading | mixing of rubber | gum.
According to the invention of claim 3, the degree of kneading is gradually increased by supplying the rolled rubber to the outer peripheral surface of the kneading roll and circulating the rubber.
According to the invention which concerns on Claim 4, the conveyance direction of the rubber | gum adhering to the outer peripheral surface of the kneading roll is controlled by changing the space | interval of the kneading roll which opposes.

  According to the present invention, a rubber bank stays in a valley between a pair of rolls as in a conventional apparatus, and kneading is carried out by squeezing while conveying rubber with a roll, instead of kneading by repeatedly rotating the roll. By doing so, it is possible to prevent air from being caught during rubber kneading.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a diagram showing a configuration of a rubber sheet manufacturing apparatus according to an embodiment of the present invention.
The rubber sheet manufacturing apparatus includes a kneading roll apparatus 1 including a plurality (here, 5) of kneading rolls 1A to 1E, a rolling roll apparatus 4 including a fixed roll 2 and a moving roll 3, and a kneading roll apparatus 1 respectively. In order to guide the conveyance of rubber between the downstream end in the conveying direction and the moving roll 3, between the fixed roll 2 and the upstream end in the conveying direction of the kneading roll device 1, and between the fixed roll 2 and a winding device (not shown). Guide rolls 5, 6 and 7, a thickness sensor 8 for measuring the thickness of the rubber sheet G4 adhering to the outer peripheral surface of the fixed roll 2, and a rubber sheet G4 adhering to the outer peripheral surface of the fixed roll 2 And a width direction cutter 9 for cutting out a part in the width direction. Here, like the width direction cutter 36 in the conventional apparatus, a pair of the width direction cutters 9 are arranged in the width direction of the fixed roll 2 with a predetermined interval set by the width of the rubber sheet to be manufactured.

  The kneading rolls 1A to 1E are supplied with hot water for controlling the outer peripheral surface temperature of the roll. Further, the interval between the opposing rolls of the kneading rolls 1A to 1E is variable. The kneading rolls 1A to 1E generate a compressive strain within the compression elastic limit of the rubber against the rubber dough supplied to the outer peripheral surface of the roll. It has a function of raising the temperature to a predetermined temperature by the heat generation and heating with a roll to improve the deformability of the rubber. The surface temperature of the roll is adjusted to a constant temperature of 55 ° C. or higher (about 90 ° C. in the case of a rubber fabric with high adhesion to the roll) to prevent the rubber fabric from sticking.

  The fixed roll 1 can rotate in the direction of the arrow y, similarly to the fixed roll 31 in the conventional apparatus. Further, the axis of the moving roll 2 is parallel to the axis of the fixed roll 1 and can approach and separate from the axis of the fixed roll 1. Furthermore, it can rotate in conjunction with the fixed roll 1 in the direction of arrow z. The fixed roll 1 and the moving roll 2 can be heated or cooled by hot water or cold water supplied to the inside, and a nip 10 is provided between both rolls.

  Hereinafter, a procedure for manufacturing a rubber sheet by the rubber sheet manufacturing apparatus according to the present embodiment will be described with reference to FIGS. 2 and 3. Here, FIG. 2 is a diagram for explaining the procedure for kneading and rolling the rubber dough, and FIG. 3 is for explaining the procedure for supplying a rubber sheet molded to a predetermined width and thickness to the winding device. FIG.

  In the kneading and rolling procedure shown in FIG. 2, the kneading rolls 1A to 1E are first rotated, and hot water set at a constant temperature is supplied into the kneading rolls 1A to 1E from a hot water supply device (not shown). The heating rolls 1A to 1E are heated, and the hot water whose temperature has been reduced due to heat removal is returned to the hot water supply apparatus, heated and supplied again into the kneading rolls 1A to 1E. Thereby, the temperature of the outer peripheral surfaces of the kneading rolls 1A to 1E is adjusted to a temperature suitable for kneading. When kneading is started, the rubber itself generates heat based on hysteresis loss, so the temperature of the outer peripheral surface of the kneading rolls 1A to 1E is measured with a non-contact temperature sensor (not shown) so that the measured value becomes constant. The temperature of the hot water supplied into the kneading rolls 1A to 1E is controlled.

  Next, the rubber dough G1 is extruded from a rubber extruder (not shown) and supplied to the kneading roll device 1. In the figure, the material is supplied onto the kneading roll 1A at the upstream end of the conveying side of the kneading roll apparatus 1. The rubber dough G1 supplied to the kneading roll device 1 is squeezed by opposing rolls and kneaded, and is successively conveyed to a kneading roll in the downstream direction, and is carried out of the kneading roll device 1 as rubber G2. The kneading by the kneading roll device 1 is performed by squeezing while being conveyed by the opposing rolls, and is not repeatedly rotating the bank staying in the valleys of the roll as in the conventional device. It will not bite air.

  At this time, the kneading effect with respect to the rubber cloth G1 becomes larger when the interval between the opposing rolls of the kneading rolls 1A to 1E is narrowed. However, if the gap between the kneading rolls becomes narrow at the time when the supply of the rubber dough G1 is started from the rubber extruder, the rubber dough G1 adheres to the kneading roll 1A like the rubber G0 in FIG. As a result, there is a possibility that it will not be supplied to the adjacent kneading roll 1B. Therefore, when the supply of the rubber dough G1 from the rubber extruder is started, it is confirmed that the kneading rolls 1A, 1B, 1C, 1D, 1E are widened and conveyed from the kneading roll 1A to 1E. It is preferable to narrow the interval at the time when it is done. The confirmation at this time can be performed, for example, based on the image data obtained by photographing the outer peripheral surface of the kneading roll 1E with an image sensor. In addition, the time from when the rubber dough G1 starts to be fed onto the outer peripheral surface of the kneading roll 1A with the interval between the kneading rolls 1A to 1E being wide is measured in advance. May be.

  The rubber G2 carried out of the kneading roll device 1 is supplied to the upper surface of the moving roll 3 by the guide roll 5, and forms a small bank G3 in the valley between the fixed roll 2 and the moving roll 3. The bank G3 passes through a nip formed between the fixed roll 2 and the movable roll 3, so that the bank G3 is molded to a predetermined thickness, and the rubber sheet G4 adheres to the outer peripheral surface of the fixed roll 4. Here, unlike the bank 47 of the conventional apparatus, the bank G3 is a kneaded rubber, and therefore passes through the nip 10 without staying in the valleys of both rolls. At this time, the thickness of the rubber sheet G4 is measured online by the thickness sensor 8, and the axis of the movable roll 3 is moved and the nip is adjusted so that the measured value becomes a predetermined value, thereby adjusting the rubber sheet G4. The feedback control is performed so that becomes a predetermined thickness.

  The rubber sheet G4 adhering to the outer peripheral surface of the fixed roll 4 is taken up by the guide roll 6 to become a rubber sheet G5 and supplied to the outer peripheral surface of the kneading roll 1A of the kneading roll device 1. The rubber sheet G5 supplied to the outer peripheral surface of the kneading roll 1A is kneaded in the same manner as the rubber cloth G1 and reaches the valley between the fixed roll 2 and the movable roll 3 through the surfaces of the guide roll 5 and the movable roll 3. Then, it again passes through the nip 10 and is molded to a predetermined thickness. That is, kneading by the kneading roll device 1 and molding to a predetermined thickness by the rolling roll device 4 are repeatedly performed. Sufficient kneading is performed by repeating kneading in this way.

  When the kneading by the kneading roll device 1 and the molding to the predetermined thickness by the rolling roll device 4 are repeated and the thickness measurement value by the thickness sensor 8 is stabilized, the operation of the kneading roll device 1 as shown in FIG. The supply of the rubber G2 from the kneading roll device 1 to the moving roll 3 and the supply of the rubber G5 from the fixed roll 2 to the kneading roll device 1 are stopped, and a predetermined width from the rubber sheet G4 attached to the outer peripheral surface of the fixed roll 4 The portion G6 is cut out by the widthwise cutter 9 and conveyed to the winding device (not shown) by the guide roll 7. Thus, the rubber sheet G6 having a predetermined width and thickness is supplied to the winding device.

  In the above description, the rubber sheet G5 is obtained by pulling the rubber sheet G4 with the same width by the guide roll 6. The rubber sheet G4 has a predetermined width (the same width as the width of the rubber sheet G6 to be manufactured). What is cut in width may be taken up by the guide roll 6 and used as a rubber sheet G5. If comprised in this way, since the quantity of the rubber | gum which knead | mixes repeatedly with the kneading roll apparatus 1 can be decreased, rubber | gum can be knead | mixed little by little reliably.

It is a figure which shows the structure of the rubber sheet manufacturing apparatus which concerns on embodiment of this invention. It is a figure for demonstrating the procedure which knead | mixes and rolls rubber | gum material in embodiment of this invention. It is a figure for demonstrating the procedure which supplies the rubber sheet shape | molded by the predetermined | prescribed width and thickness to the winding device in embodiment of this invention. It is a figure for demonstrating the conventional rubber sheet manufacturing apparatus and manufacturing method.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Kneading roll apparatus, 1A-1E ... Kneading roll, 2 ... Fixed roll, 3 ... Moving roll, 4 ... Rolling roll apparatus, 5, 6, 7 ... Guide roll , 9 ... A cutter in the width direction.

Claims (5)

  A kneading roll device composed of a plurality of kneading rolls, kneading the supplied rubber along the outer peripheral surface of the kneading roll, and rolling the rubber kneaded by the kneading roll device into a rubber sheet A rubber sheet manufacturing apparatus comprising: a rolling roll device for molding. In the rubber sheet manufacturing apparatus according to claim 1,
A rubber sheet manufacturing apparatus comprising means for adjusting the surface temperature of the kneading roll. In the rubber sheet manufacturing apparatus according to claim 1,
A rubber sheet manufacturing apparatus comprising a conveying means for supplying a rubber sheet molded by the rolling roll apparatus to the kneading roll apparatus. In the rubber sheet manufacturing apparatus according to claim 1,
An apparatus for producing a rubber sheet, comprising means for changing an interval between opposed rolls of the kneading roll device.   A step of rotating a plurality of kneading rolls facing each other and supplying rubber to the outer peripheral surface of the kneading roll; a step of conveying the rubber while kneading the outer peripheral surface of the kneading roll; and the kneading roll And a step of molding the rubber unloaded from the roll into a sheet by a rolling roll.

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