Center shot extrusion head for coating wire

Details Center shot extrusion head for coating wire Center shot extrusion head for coating wire

1996-01-03

1996-10-15

Nguyen, Khanh P.

Plastic article or earthenware shaping or treating: apparatus

Distinct means to feed, support or manipulate preform stock...

Extrusion shaping means

4251311, 4251331, 425186, 425190, 425461, 425467, B29C 4702, B29C 4712

Patent

active

055652182

ABSTRACT:
An extrusion head includes a housing having a passageway extending therethrough, a portion of the passageway tapered in frusto-conical fashion, an inlet hole extends from the outer surface of the housing into the passageway such that insulating material can flow into the passageway, a first die member is configured to be inserted within the passageway and having a tapered outer surface which engages the tapered portion of the passageway forming a sealed relation therebetween, the first die member includes an opening extending therethrough, an intermediate die member is also configured to be inserted within the passageway and includes an annular groove including a narrow portion and a wider portion, the narrow portion of the groove aligns with the inlet hole when the intermediate die member is inserted within the passageway and allows for substantially uniform flow of the coating material therearound resulting in a substantially uniform and accurate extrusion of the insulating material onto a wire which passes through the extrusion head, a plug member is threaded into the passageway and engages the intermediate die member so as to securely hold it in position.

REFERENCES:
patent: 4165957 (1979-08-01), Kertscher
patent: 4806425 (1989-02-01), Chu-Ba
patent: 5031568 (1991-07-01), Milliman
patent: 5183669 (1993-02-01), Gouillemette
patent: 5316583 (1994-05-01), Milliman
patent: 5332379 (1994-07-01), Baumgarten
patent: 5468137 (1995-11-01), Becktel et al.

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