Method and apparatus for producing rod shape article with synthetic resin

Abstract

The invention can prevent interruption of manufacturing work when exchanging a bobbin. In a manufacturing apparatus of a synthetic resin bar, thermoplastic resin is consecutively extruded by an extruder, to coat the outer periphery of a tensile strength body T such as a steel wire, etc., traveling at a prescribed speed, and then cooled to be solidified to form a covering layer. The manufacturing apparatus has a sending-out apparatus 10 of the tensile strength body T positioned in front of an extruder forming the covering layer. The sending-out apparatus 10 is provided with a mounting part 32 of a bobbin 30 on which the tensile strength body T is wound by a prescribed quantity, a feeding apparatus 34 of the tensile strength body T, a line reservation part 36 for reserving the prescribed quantity of the tensile strength body T, and a tension applying part 38 for applying prescribed tension to the travelling tensile strength body T. The travelling tensile strength body T is reserved in the line reservation part 36 provided with entrance and exit sheaves 36a, 36b and a turn sheave 36c in a state where a reserved line length can be changed.

Description

technical field [0001] The present invention relates to a synthetic resin rod-shaped object coated with a thermoplastic resin on a steel wire, for example, a method and a manufacturing apparatus for the rod-shaped object used for a tensile wire of a spiral bushing for carrying an optical fiber. Background technique [0002] As an apparatus for manufacturing a spiral bushing for carrying an optical fiber, for example, a technique proposed in Japanese Patent No. 2827183 is known. In the manufacturing device disclosed in this gazette, the basic configuration is that a vibration prevention device is provided between the delivery drum on which the tensile member such as steel wire is wound and the extruder, and the device is equipped with a device for preventing the tensile member from being sent out. The vibration of the anti-tension body sent out from the drum rotates at the same pace as the delivery speed of the anti-tension body, and the pair of annular members of the anti-te...

AI Technical Summary

Problems solved by technology

Manufacturing has to be interrupted during this period, and the shape must be stabilized after restarting manufacturing, resulting in a lot of product loss

[0006] In addition, the winding tension of the tensile body such as steel wire wound on the drum is not constant. If the tensile body is output in this state, the tension will fluctuate when it is sent out, and it will be formed in the extrusion molding machine. Decreased shape and dimension accuracy of synthetic resin bushing layer

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