Method and apparatus for molding hollow, slender workpieces

Details Method and apparatus for molding hollow, slender workpieces Method and apparatus for molding hollow, slender workpieces

1981-12-07

1983-12-27

Hoag, Willard E.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

To produce composite, plural part or multilayered article

264259, 2643281, 249122, 425112, 425116, 425127, 425129R, 425190, 425577, B29C 500, B29D 2308, B29F 1022

Patent

active

044229950

ABSTRACT:
There is provided a method for injection-molding an elongate hollow workpiece about a central core. A first quantity of plastic is injected into a first mold cavity through which part of the core extends, to form a spacer element around the core. After the spacer element has hardened, the core and spacer element are transferred to a second mold cavity in which the spacer element holds the core separated from the walls, thereby supporting it against lateral movement. Then, a second quantity of plastic is injected into the second mold cavity to complete the workpiece.

REFERENCES:
patent: 3375552 (1968-04-01), Beck
patent: 3947176 (1976-03-01), Rainville
patent: 4295811 (1981-10-01), Sauer
patent: 4347209 (1982-08-01), Suzuki

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