JPH10329198A - Method and apparatus for manufacturing filament - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent damage of a sliding part by slidably mounting a die at a crosshead via a slip bush. SOLUTION: A sleeve 3 is charged to a crosshead body 2 from the side of supplying a core wire 4. Further, a rotary die 5 is mounted at the body 2 via a holder 7. Oil free heat resistant slip bushes 91, 92, 93 are interposed between the surfaces of them so that the die 5 is rotatable due to relative slip to them. When resin 1 is supplied from an extruder body side, it flows into the body 2, spreads by the sleeve 3, and is then extruded from the die 5 to form a predetermined coating on the wire 4. In this process, the die 5 is rotated at a predetermined speed by a motor to extrude filament 10 having a spiral groove via a groove of the inner surface of the die. Thus, damage of the sliding part of the die 5 is prevented to lengthen its lifetime.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the field of extrusion production of a filament, and more specifically, a method of producing a filament having a spiral groove on the surface by extruding a resin with a rotary die. And a manufacturing apparatus. This type of striated body includes a finned cable and a spacer for snow, sound and vibration proofing.

[0002]

2. Description of the Related Art FIG. 2 shows an example of a conventional apparatus for manufacturing a linear body with a crosshead as a center. A resin 1 supplied from an extruder main body (not shown) is used as a crosshead body 2.
After it flows into the inside and is expanded by the sleeve 3, it is pushed out by the rotating die 5. In addition, the filament 10 manufactured by this is manufactured as what is extruded and coated on the core wire 4.

The rotary die 5 is attached to the crosshead body 2 by a holder 7, and ball bearings 81, 8 are provided on each surface of the crosshead body 2 and the holder 7.
By interposing the two and 83, the rotary die 5 is rotatably supported.

[0004] A sprocket 6 is mounted on the rotary die 5 at a portion protruding to the outside, and is linked to a motor (not shown) via a chain or the like, so that the rotary die is rotated at a predetermined rotation speed. Accordingly, a spiral groove is formed on the surface of the striated body 10 by the groove on the inner surface of the rotary die 5.

[0005]

In the above-mentioned prior art; the manufacturing apparatus shown in FIG. 2; and the method, ball bearings 81, 82 and 83 are used to make the rotary die 5 rotatable. , A lubricant is indispensable, and it is generally used in an environment of 100 ° C. or less.

However, when a lubricant is supplied to a ball bearing that supports a rotary die, the lubricant may be mixed into the extruded resin, and the lubricant cannot be used.

In order to extrude the resin with the crosshead, it is necessary to heat the crosshead body to a temperature at which the resin can be extruded, for example, to 180 ° C. or more for polyethylene, and to 100 ° C. or less as described above. In the case of a ball bearing used at a temperature, it must be used at a temperature as high as nearly twice the heat-resistant temperature.

[0008] Under the circumstances described above, the life of the ball bearing supporting the rotary die is extremely short, and the ball bearing is damaged in one to two weeks, and the extrusion line must be stopped in a short time.

Therefore, the problems to be solved by the present invention (objects)
It is an object of the present invention to provide a method of manufacturing a striated body and a device therefor, which can prevent a sliding portion of a rotary die from being damaged and can extend the life.

[0010]

According to the present invention, there is provided a method of manufacturing a striated body, which comprises extruding a resin by a die slidably mounted on a crosshead by a slide bush.

[0011] Further, according to the present invention, there is provided an apparatus for manufacturing a linear body having a rotary die in a crosshead, wherein a sliding bush is provided between the rotary die and the crosshead body and the holder. Intervening.

The sliding bush does not require lubrication, and a heat-resistant sliding bush can be easily obtained.

[0013]

FIG. 1 shows an embodiment of the present invention. Reference numeral 2 denotes a crosshead body in which a sleeve 3 is loaded from a side supplying a core wire 4 and a rotary die 5 is provided on an extruding side. Is attached.

The rotating die 5 is attached to the crosshead body 2 by the holder 7, and an oil-free, heat-resistant sliding bush is provided between the rotating die 5 and each surface of the crosshead body 2 and the holder 7. The rotating dies 5 are provided with the sliding bushes 91, 9
2 and 93 are rotatably supported by relative sliding.

The rotary die 5 assembled as described above
Has a sprocket 6 mounted on a portion protruding toward the pushing side, and is linked to a motor (not shown) via a chain or the like.

According to the apparatus configured as described above, the resin 1 supplied from the extruder main body flows into the crosshead body 2, is developed by the sleeve 3, and is extruded from the rotary die 5. A predetermined coating is formed on the core wire 4. In the process, the rotary die 5 is rotated at a predetermined speed by a motor, and is extruded as a linear body 10 having a spiral groove by a groove on the inner surface of the die.

When the extrusion manufacturing was continuously performed as described above, the sliding portion of the rotary die 5, that is, the sliding bushes 91, 92, 93 was not damaged even after 3 months or more, and the sliding was performed. It was confirmed that there was no machine stop due to moving part breakage and stable continuous operation was possible.

[0018]

According to the present invention as described above, it is intended to provide a method and an apparatus for manufacturing a striated body which can prevent the sliding portion of the rotary die from being damaged and extend the life. The problem (purpose) can be achieved, and in the conventional ball bearing, it was necessary to always prepare a large number of spare parts because it was not known when the ball bearing would be damaged. However, according to the present invention, spare parts were required. Thus, it can be said that there is no need for parts and replacement costs, and the economic effect is great.

[Brief description of the drawings]

FIG. 1 is an explanatory cross-sectional view of a crosshead having a rotary die according to an embodiment of the present invention.

FIG. 2 is an explanatory cross-sectional view of a crosshead having a rotating die according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Resin 2 Crosshead body 3 Sleeve 4 Core wire 5 Rotating die 6 Sprocket 7 Holder 91, 92, 93 Sliding bush 10 Linear body

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Akira Shoji 5-1-1, Hidaka-cho, Hitachi City, Ibaraki Prefecture Hidaka Factory, Hitachi Cable, Ltd.

Claims (2)

[Claims] 1. A method of extruding a resin supplied into a crosshead by a rotary die, wherein the resin is extruded by the die slidably mounted on the crosshead by a slide bush. Method. 2. An apparatus for manufacturing a linear body having a rotary die in a crosshead, wherein a sliding bush is interposed between the rotary die and the crosshead body and a holder.