Calendering paper containing thermoplastic contaminants

Details Calendering paper containing thermoplastic contaminants Calendering paper containing thermoplastic contaminants

1976-01-08

1977-04-05

Bashore, S. Leon

Paper making and fiber liberation

Processes and products

Conditioning, preparing or repairing of apparatus

100 38, 100 93RP, 162206, 162359, D21F 506, D21F 902

Patent

active

040160300

ABSTRACT:
A pulp slurry including pulp made from recycled waste paper is formed into tissue paper in a paper-making machine having an improved calender stack preceded by a conventional drying and creping section. Drying may be completed on a Yankee dryer or the drying may be partial on the Yankee and completed on so-called afterdryers. One or more rolls in the calender stack are cooled to about 90.degree. F by passing liquid coolant therethrough to keep the paper at a temperature below the melting temperature of thermoplastic contaminants in the recycled waste paper so that the contaminants pass through the calender roll in a hardened, nonsticky or less sticky condition. The cooled calender roll is kept dry by an air shower. A continuous doctor on the cooled roll removes any contaminants that adhere to the roll.

REFERENCES:
patent: 680135 (1901-08-01), Drew et al.
patent: 1291626 (1919-01-01), Parks
patent: 1326615 (1919-12-01), Pope
patent: 2001023 (1935-05-01), Howell et al.
patent: 2111834 (1938-03-01), Berry
patent: 2378113 (1945-06-01), Van De Carr, Jr.
patent: 2908964 (1959-10-01), Appenzeller
patent: 2981175 (1961-04-01), Goyette
patent: 3082683 (1963-03-01), Justus
patent: 3647619 (1972-03-01), Mack et al.
patent: 3957573 (1976-05-01), Miyamoto et al.

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