B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/974
B29C 65/42 (2006.01)
Patent
CA 1235560
"A PROCESS FOR WELDING THERMOPLASTIC BY INJECTION" ABSTRACT OF THE DISCLOSURE 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.
499245
Drader Clarence H.
Johnson Ernest Peter
LandOfFree
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