Multiple-roll calendars for producing thermoplastics film

Details Multiple-roll calendars for producing thermoplastics film Multiple-roll calendars for producing thermoplastics film

1975-07-21

1977-07-26

Spicer, Jr., Robert L.

Plastic article or earthenware shaping or treating: apparatus

Press forming means, press reshaping means, or vulcanizing...

425DIG235, 425367, 425372, B29C 1500

Patent

active

040380122

ABSTRACT:
A multiple-roll calender for producing thermoplastics films, in which, viewed in the direction of working, a penultimate roll is spaced from the roll which immediately precedes it so that for a period as it travels from said preceding roll to the penultimate roll the material being calendered is not in contact with any of the rolls, and said penultimate roll and a final roll which together define a final working gap, are provided with drive means whereby they can be driven at varying speeds independently of the other rolls.
A guide roller may be provided to guide the material centrally into the final working gap or a pull-off roller or pair of pull-off rollers and a constant pressure roller may be provided to guide the material to the final working gap. Alternatively a pull-off roller and a scraper device, defining with the penultimate roll a gap which narrows in a downstream direction may be provided.

REFERENCES:
patent: 2258659 (1941-10-01), Mosler
patent: 2897538 (1959-08-01), Shapiro et al.
patent: 2898873 (1959-08-01), Cale
patent: 3499957 (1970-03-01), Ancker
patent: 3655312 (1972-04-01), Erb et al.
patent: 3936258 (1976-02-01), Lake

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