Vacuum calibrator tool

Details Vacuum calibrator tool Vacuum calibrator tool

1995-08-07

1997-07-15

Davis, Robert

Plastic article or earthenware shaping or treating: apparatus

Including means advancing continuous length work through...

264562, 425 92, 4253261, 425388, B29C 4790

Patent

active

056481020

ABSTRACT:
A vacuum calibrator tool for use with a vacuum chamber is provided to accurately size and shape the outer surface of molten plastic extrudate entering the vacuum chamber. The tool provides water passages to introduce water into the extrudate receiving opening of the tool at several positions along the extrudate receiving opening so that an extended zone of water within the extrudate receiving opening provides a film of water between the vacuum calibrator tool and the extrudate passing through it to lubricate the extrudate and to permit accurate sizing and shaping of the extrudate. The vacuum calibrator tool is preferably formed of a low coefficient of friction plastic material such as glass filled polytetrafluroethylene solid commercially under the registered trademark TEFLON.RTM..

REFERENCES:
patent: 3541189 (1970-11-01), Yoshikawa et al.
patent: 3717426 (1973-02-01), Tucking et al.
patent: 4022557 (1977-05-01), Johnson
patent: 4029452 (1977-06-01), Schippers et al.
patent: 4543051 (1985-09-01), Maillefer
patent: 4740146 (1988-04-01), Angelbeck
patent: 5464335 (1995-11-01), Bessemer et al.
patent: 5516270 (1996-05-01), Lehtinen

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