Process for welding thermoplastic by injection

Details Process for welding thermoplastic by injection Process for welding thermoplastic by injection

1985-10-24

1987-12-08

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Repairing or restoring consumer used articles for reuse

15624411, 156499, 219421, 2221465, 264261, 264266, B29C 3502, B29C 4514, B29C 6502, B32B 3500

Patent

active

047117460

ABSTRACT:
A device is provided for forming a plastic weld, to repair a crack in a plastic article or join two plastic parts. The device comprises a barrel having an internal chamber. A nozzle is part of the barrel and forms a restrictive orifice outlet. Plastic filler rod can be forced by drive rolls into the chamber through an inlet. A heater coil is provided to heat the barrel. In use, the drive rolls are actuated to fill the chamber with filler plastic and generate a high pressure (e.g. 2500 psi). Concurrently, the heater coil heats the plastic in the chamber to a molten state. The molten plastic is forcefully ejected through the orifice outlet. To effect the weld, the hot tip of the nozzle is buried in the workpiece and drawn along the crack; it plasticizes the weld area plastic as it moves along. At the same time, the molten filler plastic is jetted into the molten weld area plastic and forcefully intermixed therewith to generate a competent bead.

REFERENCES:
patent: 2372737 (1945-04-01), Philips
patent: 2862543 (1955-12-01), Kaminsky
patent: 3713947 (1973-01-01), Hawkins
patent: 4090643 (1978-05-01), Wilkinson et al.
patent: 4199082 (1980-04-01), Ornsteen
patent: 4289257 (1981-09-01), Herb et al.
patent: 4378076 (1983-03-01), Stirnweiss
patent: 4601597 (1986-07-01), Bertram et al.

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