Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – By calendering
Patent
1988-01-11
1989-10-17
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
By calendering
2642102, 26421113, 264216, 264237, 425 66, 425 721, 425325, B29C 4790
Patent
active
048745715
ABSTRACT:
The invention relates to an apparatus for calendering a plastic web extruded from a slot die, and a method of operating this apparatus, the apparatus having at least two cooled rolls, which work in conjunction, the plastic web passing through the calendering nip between them. The plastic is particularly a partly crystalline type, notably polypropylene. The slot die is arranged above the first nip, and the plastic web passing through the nip continuously comes off the first roll and passes around the second roll at about 180.degree. or more. Below the nip there is a blowing device for causing cooling gas to impinges along the entire width of the plastic web in the channel between the first roll and the plastic web coming off it.
REFERENCES:
patent: 3277227 (1966-10-01), Kesseler et al.
patent: 3429959 (1969-02-01), Salhofer
patent: 3708565 (1973-01-01), Seiffert
patent: 3981952 (1976-09-01), Ruddell et al.
patent: 4056592 (1977-11-01), Izumi et al.
patent: 4340342 (1982-07-01), Kim
Dubno Herbert
Reifenhauser GmbH & Co. Maschinenfabrik
Thurlow Jeffery
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