JP2004345085A - Rubber sheet manufacturing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for manufacturing a rubber sheet of stable quality. <P>SOLUTION: The apparatus for manufacturing the rubber sheet is equipped with an extruder 1 for warming a rough rubber sheet to extrude the same, a chamber 5 having an introducing part 10 for directly introducing the rubber extruded from the extruder 1 into the chamber 5, the rubber sump part 6 provided on the chamber 5 to communicate with the introducing part 10, the cap 8 communicating with the rubber sump part 6 and a roller 7 rotated relatively with respect to the chamber 5 and discharging the rubber sheet RS having a predetermined cross-sectional shape through the cap 8. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a rubber sheet manufacturing apparatus, and more particularly, feeds extruded from an extruder by directly introducing rubber extruded from an extruder that heats and extrudes a rough dough into a rubber introduction section of a chamber. The present invention relates to a rubber sheet manufacturing apparatus capable of preventing a change in rubber temperature and manufacturing a rubber sheet of stable quality.
[0002]
[Prior art]
In the production process of tires and the like, the extrusion process of producing a rubber sheet is one of the most important processes in producing a tire having strict requirements for uniformity (uniformity). It is necessary to manufacture a rough dough kneaded with an internal mixer so as to maintain accurate and uniform length, thickness, shape and weight.
[0003]
Although not a patent document, FIGS. 5 and 6 show a conventional rubber sheet manufacturing apparatus. FIG. 5 is an explanatory view showing the entire configuration of a conventional rubber sheet manufacturing apparatus, and FIG. 2 is a view taken in the direction of arrow A in FIG. The extruder 1 feeds the dough kneaded by the internal mixer in the previous step from the hopper 2 and pushes out the heated rubber feed FR from the head 3. The feed rubber FR is conveyed rightward in FIG. 5 by the circulation type conveyor 4 and supplied to the rubber reservoir 6 from the upper part of the right chamber 5. The cylindrical roll 7 continuously rotates in the counterclockwise direction, and discharges the rubber sheet RS molded into a desired shape from the gap between the base 8 and the roll 7.
[0004]
In this conventional technique, the feed rubber FR heated by the extruder 1 cools during the conveyance by the conveyor 4, and therefore, there is a possibility that the rubber sheet RS cannot be molded with stable shape accuracy. Therefore, the periphery of the conveyor 4 is covered with a cover, and warm water is supplied to keep the feed rubber FR warm. This heat treatment has a certain effect when stable production is performed at a constant conveyor speed. However, in recent years, there has been a tendency for small-lot production of many kinds, and as a result, fluctuations in the extrusion speed due to switching of kinds and temporary suspension of production equipment frequently occur. As a result, it takes a long time to keep the temperature until the start-up, and there are problems such as a decrease in the operation rate of the equipment and an unstable quality of the rubber sheet RS. Conveyors with a heat retention function are expensive, and the size of the equipment itself is large.
[0005]
FIG. 7 shows another conventional rubber sheet manufacturing apparatus. In this apparatus, two cylinders 11A and 12A each having a screw provided therein extend into a two-layer extruder 10A, and each material is supplied from a hopper 13A or 14A to each cylinder 11A or 12A. Is done. A cord (made of steel or resin) 3A is further supplied to the two-layer extruder 10A from a plurality of reels 18A, and a strip-shaped narrow carcass member 5A is extruded from the extruder 10A. (See Patent Document 1).
In the rubber member extruder described in Patent Document 1, the cylinders 11A and 12A and the extruder 10A are integrally formed, and the rubber is hardly cooled during the transportation. The cylinders 11A and 12A have a complicated structure with a screw inside, and have a problem that they are increased in size and costly.
[0006]
[Patent Document 1]
JP-A-2002-307520 (paragraph number “0037”, FIG. 1)
[0007]
[Problems to be solved by the invention]
The present invention has been made in view of the above problems, and an object thereof is to extrude rubber from an extruder that heats and extrudes rough dough by directly introducing the rubber into a rubber introduction section of a chamber. It is an object of the present invention to prevent a change in the temperature of a feed rubber obtained and to produce a stable quality rubber sheet.
[0008]
[Means for Solving the Problems]
The invention according to claim 1 is a rubber sheet manufacturing apparatus comprising: an extruder that heats and extrudes a rubber raw material; and a rubber sheet molding machine that includes a roll for molding rubber in a rubber reservoir. Is directly connected to a rubber sheet molding machine, and the rubber extruded from the extruder is directly introduced into a rubber reservoir of the rubber sheet molding machine.
[0009]
According to a second aspect of the present invention, in the rubber sheet manufacturing apparatus according to the first aspect, the rubber sheet molding machine is provided with a mouthpiece that communicates with the rubber reservoir and forms the rubber extruded by the roll into a sheet shape. A rubber sheet manufacturing apparatus characterized in that:
[0010]
A third aspect of the present invention is the rubber sheet manufacturing apparatus according to the first or second aspect, wherein a plurality of extruders are directly connected to the rubber sheet forming machine.
[0011]
According to a fourth aspect of the present invention, there is provided the rubber sheet manufacturing apparatus according to the second or third aspect, further comprising a means for keeping the extruder, the molding machine, and the roll at a predetermined temperature. It is a sheet manufacturing apparatus.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view of a rubber sheet manufacturing apparatus according to a first embodiment of the present invention, and FIG. 2 is a view taken in the direction of arrow B in FIG. The first embodiment is an example in which there is one extruder and a single material rubber sheet is discharged. The same parts as those of the above-described conventional device will be described with the same reference numerals.
[0013]
In FIG. 1, the extruder 1 has an end face 3A of a head 3 in close contact with an end face 5A of a chamber 5 of a rubber sheet molding machine, and is directly connected to the chamber 5 by tightening bolts or the like. The rubber discharge hole 9 formed inside the head 3 opens in the right end face 3A with its tip expanding toward the right end face 3A of the head 3 in plan view of FIG. The chamber 5 is provided with a rubber introduction portion 10 having the same cross-sectional shape as the opening of the rubber discharge hole 9. The left side of the rubber introduction part 10 is opened at the left end face 5A of the chamber 5, and the shape and the size are matched with the opening part of the rubber discharge hole 9 on the head 3 side. The right side of the rubber introduction part 10 is open to the rubber storage part 6 of the chamber 5. Accordingly, the rubber heated by the extruder 1 is supplied from the rubber discharge hole 9 of the head 3 to the rubber reservoir 6 through the rubber inlet 10 of the chamber 5.
[0014]
The rubber reservoir 6 is a space formed between the arc-shaped concave portion 5 </ b> B (FIG. 1) of the chamber 5 and the outer periphery 7 </ b> A of the roll 7. A base 8 is fixed to the end face 5C of the chamber 5, and a gap between the base 8 and the roll 7 is formed in a desired and accurate dimension and shape. When the roll 7 rotates counterclockwise, the rubber sheet RS is discharged from the gap between the base 8 and the roll 7. The discharged rubber sheet RS is cut into an accurate width by the cutters 11 and 11 (FIG. 2) arranged on both sides in the width direction of the rubber sheet RS, and is sent in a direction indicated by an arrow X in FIG. The processing in the next step is performed.
In the above embodiment, the extruder 1, the head 3, the chamber 5, and the roll 7 are each heated by a heating means (not shown), and are kept at a constant temperature, for example, 90 ° C. for the extruder 1 and 85 ° C. for the head 3 , The chamber 5 is maintained at 85 ° C., and the roll 7 is maintained at 70 ° C. The heating means does not necessarily need to be provided individually as long as the predetermined temperature is maintained.
[0015]
According to this embodiment shown in FIGS. 1 and 2, the rubber extruded from the extruder 1 has a short distance to the rubber reservoir 6 of the chamber 5 and has no portion that comes into contact with the outside air. The temperature drop and the change in temperature can be reduced, and the rubber sheet RS having accurate dimensions and shape can be molded. Further, even if the temperature of each part is adjusted, the number of heat radiating parts is small, so that energy is saved and it is economical. Further, since no conveyor is required, the equipment is compact.
In particular, even when the molding speed of the rubber sheet RS is low (0.5 m / min or less) or when the molding is temporarily stopped due to setup change, the rubber transport path from the extruder 1 to the chamber 5 is the shortest. Therefore, the operation is stable, and the setup change is easy.
[0016]
Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 3 is a front view of a rubber sheet manufacturing apparatus according to a second embodiment of the present invention, and FIG. 4 is a view taken in the direction of arrow C in FIG. The second embodiment is an example in which there are three extruders and rubber sheets of three types of materials are used. The same parts as those in the first embodiment are denoted by the same reference numerals, and the description of the same parts as those in the first embodiment will be omitted.
[0017]
In the two extruders 21 and 22 arranged on the left side in FIG. 3, the right end surfaces of the respective heads 31 and 32 are in close contact with the left end surface 5A of the chamber 5 and are directly connected to the chamber 5 by tightening bolts or the like. I have.
The extruder 21 is connected to the chamber 5 from the horizontal direction, and the extruder 22 is connected to the chamber 5 from the upper left side. The rubber discharge holes 91 and 92 formed inside each of the heads 31 and 32 are divided into two portions toward the right end surfaces 31A and 32A of the heads 31 and 32 in the front view of FIG. , 32A. In the chamber 5, rubber introduction portions 101 and 102 having the same cross-sectional shape as the openings of the rubber discharge holes 91 and 92 are formed. The left sides of the rubber introduction portions 101 and 102 are opened at the left end face 5A of the chamber 5 and are aligned with the two branched openings of the rubber discharge holes 91 and 92 on the heads 31 and 32 side. The right side of the rubber introduction portions 101 and 102 is open to the rubber reservoir 6 of the chamber 5. Therefore, the rubber heated by the extruders 21 and 22 is supplied from the rubber discharge holes 91 and 92 of the heads 31 and 32 to the rubber reservoir 6 through the rubber introduction portions 101 and 102 of the chamber 5.
[0018]
In the extruder 23 at the upper right in FIG. 3, the feed rubber FR extruded from the lower surface of the head 33 on the left side is guided by the small roll 12, passes between the roll 7, and from the upper opening of the rubber reservoir 6. , Into the rubber reservoir 6. In FIG. 4, four partition plates 13A, 13B, 13C and 13D are inserted into the rubber reservoir 6, and the rubber reservoir 6 is partitioned into five spaces. The feed rubber FR extruded from the extruder 23 is guided to the space between the partition plates 13B and 13C. The rubber extruded from the extruder 22 is guided to a space between the partition plates 13A and 13B and a space between the partition plates 13C and 13D. The rubber extruded from the extruder 21 is guided to the space between the partition plate 13A and the chamber 5 and the space between the partition plate 13D and the chamber 5, respectively.
[0019]
When the roll 7 rotates in the counterclockwise direction, the five rubber sheets 21RS, 22RS, 23RS, 22RS, 21RS are discharged from the gap between the base 8 and the roll 7 with their boundaries connected. The rubber sheets 21RS, 21RS at both ends in the width direction of the rubber sheet are cut to the correct width by the cutters 11, 11 arranged on both sides in the width direction of the rubber sheets 21RS, 21RS, and are sent rightward in FIG. Then, the processing in the next step is performed. The extruders 21, 22, and 23, the heads 31, 32, and 33, the chamber 5, the rolls 7, and the rolls 12 are each heated and the temperature is kept constant.
[0020]
In the second embodiment, a function and effect that a rubber sheet made of a plurality of materials can be manufactured with compact equipment is added to the first embodiment.
[0021]
【The invention's effect】
Effects corresponding to the first, second, and fourth aspects: the temperature of the rubber extruded from the extruder can be reduced and the change in the temperature can be reduced, and a rubber sheet having an accurate dimension can be formed. Further, when the temperature of each part is adjusted, the number of heat radiating parts can be reduced, so that energy is saved and it is economical. Further, since no conveyor is required, the equipment is compact. In addition, since the transfer route of the rubber from the extruder to the chamber can be minimized, the operation is stable, and the setup change can be simplified.
Effect corresponding to claim 3: A rubber sheet composed of a plurality of materials can be manufactured with compact equipment.
[Brief description of the drawings]
FIG. 1 is a front view of a rubber sheet manufacturing apparatus according to a first embodiment of the present invention.
FIG. 2 is a view on arrow B of FIG.
FIG. 3 is a front view of a rubber sheet manufacturing apparatus according to a second embodiment of the present invention.
FIG. 4 is a view taken in the direction of arrow C in FIG. 3;
FIG. 5 is an explanatory view showing a conventional rubber sheet manufacturing apparatus.
6 is a view as viewed in the direction of arrow A in FIG. 5;
FIG. 7 is an explanatory view showing another conventional rubber sheet manufacturing apparatus.
[Explanation of symbols]
1, 21, 22, 23 ... extruder, 3, 31, 32, 33 ... head, 4 ... conveyor, 5 ... chamber, 6 ... rubber reservoir, 7 ... roll, 8 ... mouthpiece, 10, 101, 102 ... rubber Introductory part, 11 ... cutter.

Claims (4)

In a rubber sheet manufacturing apparatus comprising an extruder that heats and extrudes rubber dough and a rubber sheet molding machine having a roll for molding rubber in a rubber reservoir,
A rubber sheet manufacturing apparatus, wherein a head of the extruder is directly connected to a rubber sheet molding machine, and rubber extruded from the extruder is directly introduced into a rubber reservoir of the rubber sheet molding machine. The rubber sheet manufacturing apparatus according to claim 1,
The rubber sheet manufacturing apparatus is characterized in that the rubber sheet molding machine is provided with a mouthpiece that communicates with the rubber reservoir and forms the rubber extruded by the roll into a sheet shape. 3. The rubber sheet manufacturing apparatus according to claim 1, wherein a plurality of extruders are directly connected to the rubber sheet molding machine. 4. The rubber sheet manufacturing apparatus according to claim 2, further comprising a unit for keeping the extruder, the molding machine, and the roll at a predetermined temperature.

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