Method of warpage control for molded fiber trays

Details Method of warpage control for molded fiber trays Method of warpage control for molded fiber trays

1977-12-15

1979-05-01

Hoag, W. E.

Paper making and fiber liberation

Processes and products

Article forming processes

162224, 162227, 162228, 264324, B29J 504, D21J 104, D21J 106, D21J 310

Patent

active

041522036

ABSTRACT:
Method of eliminating warpage of molded fiber trays during free drying by pressing the back side of the preform where ribs cross with a dimpling projection on a rubber insert in a pressure head on a molding machine.

REFERENCES:
patent: 2939602 (1960-06-01), Grant
patent: 2996118 (1961-08-01), Chaplin
patent: 3284917 (1966-11-01), Foote
patent: 3477908 (1969-11-01), Daniele
patent: 3845896 (1974-11-01), Crabtree

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