Plastic and nonmetallic article shaping or treating: processes – With printing or coating of workpiece
Patent
1988-08-12
1990-09-11
Lowe, James
Plastic and nonmetallic article shaping or treating: processes
With printing or coating of workpiece
264229, 264249, 264266, 26427218, 264310, B29C 6502, B29C 6506
Patent
active
049561383
ABSTRACT:
A method is disclosed for the manufacture of an electrofusion coupler, for connecting adjoining lengths of thermoplastics pipes, and which coupler takes the form of a sleeve of thermoplastics material, to receive adjoining ends of adjoining pipes, the sleeve having an electrical resistance heater embedded therein and extended around the sleeve. In the method, a plastics preform is wound with a resistance heating wire, while heating the wire, to melt the surface of the preform, or applying molten plastics to the preform in the vicinity where the wire runs onto the preform, in order to ensure that the heating wire is fully embedded in the preform. A pressing roller may be run over the preform surface before the molten plastics has solidified, in order to smooth over the molten plastics. The preform 10 is subsequently placed in an injection mould and an outer encapsulating jacket is injection moulded around the preform.
REFERENCES:
patent: 3422179 (1969-01-01), Bauer et al.
patent: 4797993 (1989-01-01), Kenworthy et al.
Glynwed Tubes and Fittings Limited
Lowe James
Poff Clifford A.
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