Method and apparatus for preventing thermal damage to a preforme

Details Method and apparatus for preventing thermal damage to a preforme Method and apparatus for preventing thermal damage to a preforme

1981-10-23

1984-02-07

Lowe, James B.

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

264264, 264279, B29C 602

Patent

active

044302851

ABSTRACT:
A rotary plug valve is formed which is of the type comprising a housing formed of a polymer and a rotary plug disposed in a through-passage of the housing. The plug is formed of a polymer and includes a bore selectively alignable with the through-passage to admit the passage of fluid. The plug valve is formed by forming the plug and attaching thereto a preformed polymeric shield by snap-fitting the shield onto the plug. The shield has an inner surface conforming to the periphery of the plug. The plug and shield assembly is positioned within a cavity of a mold. The cavity corresponds to the shape of the housing. A molten polymer is introduced into the cavity and intimately contacts the shield and forms the housing around the plug.

REFERENCES:
patent: 3094376 (1963-06-01), Thomas
patent: 3202749 (1965-08-01), White
patent: 3807692 (1974-04-01), Urab et al.
patent: 4180542 (1979-12-01), Wrosman
patent: 4257575 (1981-03-01), Runyan

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