Method of monitoring the bulge temperature when welding plastic

Details Method of monitoring the bulge temperature when welding plastic Method of monitoring the bulge temperature when welding plastic

1998-07-09

1999-09-07

Osele, Mark A.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

1563041, 1563042, 1563046, 156359, B29C 6502, B29C 6510, B32B 3120

Patent

active

059481900

ABSTRACT:
The invention provides a method of welding together articles made of a thermoplastic plastic material by means of a butt welding process, whereby the two articles to be welded together are held in place in coaxial relationship by means of clamping devices. Then, the two articles are heated up by means of a heating device that can be placed between the two articles to create a molten up welding zone in the region of each of the free ends of the two articles. As soon as the welding zone has reached the proper temperature, the two articles to be welded together are pressed together to create a bulge. Finally, the temperature of that bulge is continuously monitored and the temperature of the material in the interior of the afore mentioned welding zone is calculated according to the formula ##EQU1## until such a temperature is reached at which the articles can be removed from the clamping devices.

REFERENCES:
patent: 3745641 (1973-07-01), Paolini
patent: 5225025 (1993-07-01), Lambing et al.
patent: 5241157 (1993-08-01), Wermelinger et al.
patent: 5246534 (1993-09-01), Tanner et al.
patent: 5522964 (1996-06-01), Granados
patent: 5632845 (1997-05-01), Stehle et al.
patent: 5814181 (1998-09-01), Richter et al.
patent: 5855720 (1999-01-01), Johnson et al.

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