FUSION METHOD FOR THERMOPLASTIC RESIN PRODUCT - Toa Luxury Joint Valve Manufacturing Co., Ltd.

Title:

FUSION METHOD FOR THERMOPLASTIC RESIN PRODUCT

Document Type and Number:

Japanese Patent JP2699161

Kind Code:

B2

Abstract:

PROBLEM TO BE SOLVED: To heat a resin uniformly by preventing the concentration of heat and to improve fusion quality by a method in which after a resistance heating element being heated to the melting temperature of a resin, a cooling-off period is given by interrupting the current temporarily or by lowering power supply remarkably.
SOLUTION: When a fusion work start signal is sent to CPU by turning on a start switch, the passage of the current is started with voltage read in advance. By the energization, a heating wire is heated, and when the temperature reaches the melting temperature of a resin, which was read previously, the current is interrupted for a time set in advance. After the passage of the cooling-off period, in which the current was turned off, the energization is reopened with the initial voltage. Fusion is controlled by a method in which the voltage is adjusted so that the temperature of the heating wire is kept as high as possible within a proper fusion temperature range for a time set previously, and the resin on the fusion interfaces on both sides of an EF joint 1 and a PE pipe 2.

Inventors:

Kumagaya Masaru

Application Number:

JP19110595A

Publication Date:

January 19, 1998

Filing Date:

July 03, 1995

Export Citation:

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