JP2004106223A - Extruder for rubber-coated cord and extrusion method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rubber-coated cord extrusion device which shortens the time required for molding a rubber layer even if the rubber-coated cord is used and easily alters the density of the cords. <P>SOLUTION: This rubber-coated cord extruder is equipped with a cord supply part 1 which supplies one or more cords C, a rubber supply part 2 which supplies a rubber material to be applied to the cords C and a die 11 which extrudes one or more the rubber-coated cords C in a row to mold them. In addition, the extruder is equipped with a converging roll 20 which guides the row of the rubber-coated cords C extruded from the die 11 in a width direction and a movable guide 21 for altering the guide width of the cords C. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention provides a cord supply unit that supplies a plurality of cords, a rubber supply unit that supplies a rubber material to be coated on the cord, and a die unit where a plurality of rubber-coated cords are extruded and formed in a row. And a method of extruding a rubber-coated cord using the device.
[0002]
[Prior art]
Fiber cords (reinforcement cords) are sometimes used for reinforcement in rubber products and rubber layers formed on the products. For example, there are a specific rubber layer in a tire, a rubber layer formed on an outer peripheral surface of a flexible tube, a rubber hose, a joint, and the like. In order to manufacture such a product or rubber layer, first, a fiber as a reinforcing cord is formed into a string, and several tens to several hundreds are arranged in parallel, and bonded with a low pitch weft yarn at a coarse pitch. In a state in which the fiber arrangement is not disturbed, rubber is rubbed with, for example, a calender machine to obtain an unvulcanized rubber-coated Sudarecord.
[0003]
[Problems to be solved by the invention]
However, in order to obtain such a Sudarecord, it is necessary to continuously process a large amount of material. In addition, since the beginning and end of the treatment cannot be used in rubber coating by a calendar machine, it is necessary to increase the treatment amount in consideration of this.
[0004]
In the case of hoses and joints, it is necessary to change the inner diameter of the product according to the pipe diameter. In this case, even if the inner diameter is changed, the withstand pressure must be kept constant. Therefore, when the diameter is small, the density of the reinforcing cord must be low, and when the diameter is large, the density must be high. Since it is not easy to change the density of the reinforcing cord, it has been responded by changing the number of plies.
[0005]
Therefore, there is a method of using a rubber-coated cord in which a single fiber (single) fiber is coated with a rubber, instead of the above-mentioned Sudarecord by the calendar machine. However, in the case of a single fiber, there is a problem that it takes time to form the rubber layer (winding the rubber-coated cord). Further, in order to cope with recent high-mix low-volume production, there is a demand for a mechanism that can easily change the density density even in the case of a single fiber.
[0006]
SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to reduce the time for forming a rubber layer by using a rubber-coated cord, and to easily change the density of the cord. It is an object of the present invention to provide a rubber-coated cord extruding apparatus and an extruding method.
[Means for Solving the Problems]
In order to solve the above-mentioned problems, a rubber-coated cord extruding device according to the present invention comprises:
A cord supply unit for supplying a plurality of cords, a rubber supply unit for supplying a rubber material to be coated on the cords, and a mouthpiece for extruding a plurality of cords coated with rubber in a row. A rubber-coated cord extrusion device,
The present invention is characterized in that it is provided with a guide section for guiding the width direction of the row of rubber-coated cords extruded from the base section, and a guide width changing mechanism capable of changing the guide width.
[0007]
The operation and effect of the rubber-coated cord extrusion device having this configuration are as follows. That is, a plurality of cords are supplied to the cord supply unit, and rubber is supplied to the rubber supply unit. Then, a plurality of rubber-coated rubber-coated cords are extruded and formed in rows from the base. That is, since the rubber-coated cord is not processed one by one, but is a process of a plurality of cords, the processing time can be shortened, for example, when winding the cords. Further, a guide portion is provided for guiding the row of rubber-coated cords extruded from the base portion in the width direction. This guide width is configured to be changeable. That is, if the guide width is changed, the density of the reinforcing cord can be easily changed. As a result, it is possible to provide an apparatus for extruding a rubber-coated cord, in which the time for forming the rubber layer can be reduced by using the rubber-coated cord, and the density of the cord can be easily changed. Note that the method of using the extruded rubber coated cords in a row is not limited to a specific one. That is, a rubber layer as a product may be directly formed, or may be wound into a roll at one end, and then a rubber-coated cord may be pulled out from the roll again to cut out a rubber layer to be used as a product. A form is conceivable.
[0008]
As a preferred embodiment of the present invention, a second guide portion is further provided between the base portion and the guide portion.
By providing such a second guide portion, the rubber-coated cord can be guided to the guide portion in a more stable state.
[0009]
As another preferred embodiment of the present invention, the base portion has a plurality of openings corresponding to the number of cords, and the plurality of openings are arranged in a staggered manner. can give.
[0010]
When a plurality of openings are formed in the base, if the openings approach each other, it becomes difficult to process the openings. Therefore, by arranging the openings in a staggered manner, it is possible to increase the distance between the openings and the adjacent openings, thereby facilitating the manufacture of the base. The plurality of rubber-coated cords extruded from the base part also have a staggered shape, but can be straightened by the guide part and the second guide part.
[0011]
As still another preferred embodiment of the present invention, a plurality of openings corresponding to the number of cords are formed in the base, and the openings are located at both ends in the width direction among the plurality of openings. The two openings may be formed such that the opening shapes at the both ends in the width direction are formed on the oblique sides in the same direction.
[0012]
The rubber-coated cord extruded from the base portion becomes a strip-like rubber when passing through the guide portion. For example, consider a state in which this strip rubber is wound around a drum. In this case, it is necessary to abut the ends in the width direction of the strip rubber (see FIG. 8). However, in reality, it is difficult to abut these ends, and a gap is formed or overlapped, so that a desired winding state is not obtained. Therefore, the opening shape at the both ends in the width direction is set to the oblique side for the two openings located at both ends in the width direction. With this configuration, the strip rubber manufactured by the plurality of rubber-coated cords extruded from the base has the both ends in the width direction formed on the oblique sides, and the ends can be easily butted.
[0013]
As still another preferred embodiment of the present invention, the guide portion is formed with a guide recess corresponding to a cross-sectional shape of a rubber-coated cord.
By providing such a guide recess, the rubber-coated cord can be more reliably guided.
[0014]
As still another preferred embodiment of the present invention, the cross-sectional shape of the opening formed in the base is elliptical, and the major axis direction of the ellipse coincides with the width direction.
[0015]
By covering the rubber with such an elliptical shape, even if the guide width is changed in the guide portion, adjacent rubber-coated cords can be securely joined together.
[0016]
In order to solve the above problems, the method for extruding a rubber-coated cord according to the present invention includes:
Providing a plurality of codes;
Supplying a rubber material to be coated on the cord;
Extruding a plurality of rubber-coated cords in a row from the base portion, and extruding the rubber-coated cords.
Having a step of guiding the width direction of the row of rubber-coated cords extruded from the base portion by a guide portion,
The method is characterized in that it has a step of changing the guide width in the guide portion at an appropriate timing.
The operation and effect of this configuration are as described above. The timing for changing the guide width can be changed not only before starting the extrusion molding operation but also during the extrusion molding. Thereby, the density of one rubber product (rubber layer) can be changed depending on the place.
[0017]
As a preferred embodiment of the present invention, a plurality of codes having different types are cited.
[0018]
That is, a plurality of codes are not all of the same type, but may be of different types. Thereby, various needs can be met.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
A preferred embodiment of an apparatus for extruding a rubber-coated cord according to the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing an outline of the apparatus, in which (a) shows a front view and (b) shows a side view. FIG. 2 is a perspective view showing an outline of the apparatus.
[0020]
<Apparatus configuration>
The main part of the device is composed of a part for extruding a rubber-coated cord. The code is supplied to the code supply unit 1 from the direction of arrow A in FIG. This cord is a reinforcement cord that reinforces the rubber layer, and is formed of metal fibers, synthetic fibers, chemical fibers, or the like. A plurality of codes are supplied in a row.
[0021]
A passage through which the cord passes is provided at the center of the main body 3. A cord guide 6 is fastened to the main body 3 via a set screw 4 and a nut 5. A passage for passing the cord is formed in the center of the cord guide 6. The passage of the cord is formed in the horizontal direction, but the passage of the rubber material is inclined (30 to 45 degrees) with respect to the passage of the cord. The rubber material is supplied in the direction of arrow B. Above the main body 3, an extension nozzle 7 is attached at an angle, and a flange 8 for attaching a small extruder (not shown) is attached to the extension nozzle 7.
[0022]
The intersection of the cord passage and the rubber material passage is at the junction 9 where the cord is covered with the rubber material. A die 11 (corresponding to a base) is attached to a tip end of the main body 3 by a fixing screw 10. A plurality of openings are formed in the die 11 in a row. This will be described later. From the die 11, it is extruded from a rubber-coated cord.
[0023]
A converging roll 20 (corresponding to a guide portion) is provided in front of the die 11. The converging roll 20 also has a function of guiding the width direction of the plurality of extruded rubber-coated cords in a row. FIG. 3 is an enlarged view showing the configuration of the convergence roll 20. The converging roll 20 includes a shaft portion 21 and a pair of moving guides 22 movable along the shaft portion 21. (A) shows a state where the moving guide 22 is narrowed, and (b) shows a state where the moving guide 22 is widened. That is, the moving guide 22 and a mechanism for moving the moving guide 22 function as a guide width changing mechanism. The mechanism for moving the movement guide 22 can be constituted by a motor and a transmission mechanism (gear, pinion rack, cam, etc.).
[0024]
A plurality of rubber-coated cords C are guided between the pair of moving guides 22. Further, by changing the guide width in this way, the density of the cords in a plurality of rubber-coated cords to be manufactured (the composite of the plurality of cords and rubber is referred to as a multi-cord) can be changed. The surface of the moving guide 22 that is in contact with the rubber-coated cord is an inclined surface to facilitate guiding.
[0025]
FIG. 3C shows the positional relationship between the rubber-coated cords immediately after being extruded from the die 11, and the adjacent rubber-coated cords C are in a state where a gap is opened, but are adjacent by the converging roll 20. The rubber-coated cord C is joined. In the rubber-coated cord C, a fiber C1 is disposed at the center, and a rubber C2 is coated so as to surround the periphery thereof.
[0026]
The cross-sectional shape of the rubber-coated cord C is not limited to a specific cross-sectional shape, but is preferably an elliptical shape as shown in FIG. The major axis direction of the ellipse matches the width direction of the multicode. With the elliptical shape, even if the density of the cords is reduced as shown in FIG. 3B, the joining between the adjacent rubber-coated cords can be maintained. The size of the elliptical rubber-coated cord C is, for example, about a major axis x = 2 mm and a minor axis y = 1 mm. In addition, any shape may be used as long as it is not a pure ellipse but close to an ellipse (a horizontally long shape such as an ellipse). Further, the shape may be a horizontally long rectangular shape.
[0027]
FIG. 4 is a diagram illustrating another embodiment of the convergence roll 20. In this configuration example, a plurality of guide concave portions 21 a are formed in the shaft portion 21. The shape of the concave portion 21a is preferably a shape corresponding to the cross-sectional shape of the rubber-coated cord C to be formed. Thereby, guiding can be performed more reliably.
[0028]
<Die configuration>
Next, a configuration example of the die 11 will be described. FIG. 5 is a diagram illustrating a configuration example of the dice 11 according to the first embodiment. In this example, nine square openings 11a are formed in a row (horizontally). In this case, the cross-sectional shape of the rubber-coated cord is also square. The length of one side of the square is, for example, about 0.9 mm.
[0029]
FIG. 6 is a diagram illustrating a configuration of the dice 11 according to the second embodiment. In FIG. 5, the shapes of the openings 11a are all the same, but in FIG. 6, the cross sections of the openings 11b and 11c located at both ends in the width direction are trapezoidal. In particular, the sides 110 and 111 at the both ends in the width direction are formed on the oblique sides, and are inclined at the same angle. In the case of the dice shown in FIG. 5, the cross-section of the multi cord 30 is rectangular. Considering the case where the multi-code 30 is wound around the winding drum, as shown in FIG. 8A, unless the ends 30a of the adjacent multi-codes 30 are accurately matched, the end 30a and the end Since a gap is formed between the portions 30a or one end 30a runs on the other end 30a, a desired shape may not be obtained. Thus, if the dice 11 as shown in FIG. 6 are used, the end 30a of the multicode 31 is not vertical but becomes a hypotenuse, as shown in FIG. 8B. Thereby, the ends 31a of the multi cord 31 can be smoothly joined to each other.
[0030]
FIG. 7 is a diagram illustrating a configuration of the dice 11 according to the third embodiment. In this example, the plurality of openings 11d are arranged in a row, but are formed in a staggered manner. In the configuration examples shown in FIGS. 5 and 6, it is difficult to manufacture the dies 11 because the openings are close to each other. It will be easier. In the case of the staggered shape, the plurality of rubber-coated cords extruded from the die 11 also have a staggered shape, but can be corrected to a horizontal state by the guide mechanism.
[0031]
FIG. 9 is a diagram illustrating a configuration example in which another second guide portion is provided between the die 11 and the converging roll 20. A guide roll 24 and a guide roll 23 are arranged from the side closer to the die 11. The guide width becomes smaller toward the downstream side. For example, when the guide width of the converging roll 20 is 7 mm, the guide width of the guide roll 23 is 9 mm, and the guide width of the guide roll 24 is 13 mm. This makes it possible to more reliably guide the rubber-coated cords in a row in the width direction. In the guide roll 24 closer to the die 11, the rubber-coated cord C passes above the roll, passes below the roll in the guide roll 23, and passes above the guide in the converging roll 20. This is a suitable guide mechanism when a plurality of openings are arranged in a staggered manner.
[0032]
<Still another embodiment>
The number of codes constituting the multicode is not particularly limited, but is preferably two to several tens, and particularly preferably 10 to 15 codes. The cross-sectional shape of the rubber-coated cord (that is, the shape of the opening of the die 11) is not limited to a specific shape, and various cross-sectional shapes can be adopted.
[0033]
When supplying a plurality of codes, it is not necessary to supply all codes with the same material, and codes of different materials can be supplied at the same time. For example, it is possible to manufacture a multi-cord in which a synthetic fiber or a chemical fiber is combined with a metal fiber. Thereby, multi-codes of various qualities can be obtained. Therefore, various user needs can be met.
[0034]
In the present embodiment, the guide width is changed by moving the moving guide 22 of the converging roll 20, but several guide rolls having different guide width dimensions (the dimensions are fixed) are prepared. Alternatively, the guide width may be changed by exchanging the guide width.
[0035]
There are other ways to change the code density. For example, the amount of rubber adhered can be changed by changing the supply amount and pressure of rubber during extrusion molding from the die 11. Increasing the screw rotation speed of the extruder can increase the amount of rubber adhesion, and lowering the rotation speed can reduce the rubber adhesion amount. It can also be adjusted by adjusting the amount of rubber to be supplied. Also, by increasing the take-up speed of the multi-cord, the amount of rubber adhesion can be reduced.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a view showing an outline of a rubber-coated cord extruding apparatus, wherein (a) is a front view and (b) is a side view.
FIG. 2 is a perspective view showing an outline of a rubber-coated cord extruding apparatus. FIG. 3 is a view showing a configuration of a converging roll. FIG. 4 is a view showing another embodiment of a converging roll. FIG. FIG. 6 is a diagram illustrating a configuration example of a dice according to a second embodiment. FIG. 7 is a diagram illustrating a configuration example of a dice according to a third embodiment. FIG. FIG. 9 is a view showing another embodiment of the guide section.
DESCRIPTION OF SYMBOLS 1 Code supply part 2 Rubber supply part 3 Main body part 11 Dies 11a, 11b, 11c, 11d Opening part 20 Converging roll 21 Shaft part 21a Concave part 22 Moving guide C Rubber coating cord

Claims (8)

A cord supply unit for supplying a plurality of cords, a rubber supply unit for supplying a rubber material to be coated on the cords, and a mouthpiece for extruding a plurality of cords coated with rubber in a row. An extruding device for a rubber-coated cord, comprising a guide portion for guiding a row of rubber-coated cords extruded from the base portion in a width direction, and a guide width changing mechanism capable of changing a guide width. A rubber-coated cord extruding device, characterized in that: 2. The rubber-coated cord extrusion device according to claim 1, further comprising a second guide portion provided between the base portion and the guide portion. The plurality of openings corresponding to the number of cords are formed in the base portion, and the plurality of openings are arranged in a staggered manner. Extruder for rubber coated cord. A plurality of openings corresponding to the number of cords are formed in the base, and two openings located at both ends in the width direction of the plurality of openings are respectively located at both ends in the width direction. The rubber-coated cord extrusion device according to any one of claims 1 to 3, wherein the opening shape in (1) is formed on the oblique side in the same direction. The rubber coating cord extruding device according to any one of claims 1 to 4, wherein a guide recess corresponding to a cross-sectional shape of the rubber coating cord is formed in the guide portion. The cross-sectional shape of the opening formed in the base is an elliptical shape, and a major axis direction of the ellipse coincides with the width direction. Rubber coated cord extrusion equipment. Providing a plurality of codes;
Supplying a rubber material to be coated on the cord;
Extruding a plurality of rubber-coated cords in a row from the base portion, and extruding the rubber-coated cords.
Having a step of guiding the width direction of the row of rubber-coated cords extruded from the base portion by a guide portion,
A method of extruding a rubber-coated cord, comprising a step of changing a guide width in the guide portion at an appropriate timing. The method of extruding a rubber-coated cord according to claim 7, wherein the types of the plurality of cords are different.

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