Apparatus for injection molding against a preformed web

Details Apparatus for injection molding against a preformed web Apparatus for injection molding against a preformed web

1980-01-22

1981-05-26

Hoag, W. E.

Plastic article or earthenware shaping or treating: apparatus

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

And means to apply stress to preform and uniting in stressed...

425112, 425122, 425126R, 425127, 425129R, 425383, 425394, 425412, 425542, B29C 100, B29C 304

Patent

active

042695791

ABSTRACT:
Apparatus for injection-moulding articles of plastics material onto a preformed web inserted into the mould, the web is held under substantially constant tension during the closing of the mould, between a pair of clamps, the proximal clamp being fixed relative to the mould and the distal clamp free but bearing a load to furnish the desired tension in the web. The load may be imposed by a weight attached to the distal clamp, conveniently by means of an electromagnet.

REFERENCES:
patent: 1373405 (1921-04-01), Brown
patent: 1904268 (1933-04-01), Bronson
patent: 2745164 (1956-05-01), Ros
patent: 3384281 (1968-05-01), Mason
patent: 3594262 (1971-07-01), Magidson
patent: 3659767 (1972-05-01), Martin
patent: 3849042 (1974-11-01), Anderegg
patent: 3904145 (1975-09-01), Steinberger et al.
patent: 3904338 (1975-09-01), Straumanis
patent: 4029453 (1977-06-01), Campion

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