Warp control apparatus and method for sheet material

Details Warp control apparatus and method for sheet material Warp control apparatus and method for sheet material

1989-05-31

1991-09-17

Simmons, David A.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156208, 156210, 156351, 156356, 156378, 364471, 73 73, B32B 3100

Patent

active

050492160

ABSTRACT:
The apparatus and method of the present invention provide means by which non-warped corrugated paperboard sheet may easily and consistently be produced. The cross-directional moisture content profiles of the top and bottom liners of the corrugated sheet are automatically monitored, and controlled with independently operable water jets such that the liners have approximately equal machine and cross-direction moisture content profiles. The moisture content profiles of the liners are controlled to equalize the machine direction and cross-directional stresses created within the liners as they dry out, thereby producing non-warped corrugated paperboard sheet.

REFERENCES:
patent: 3793524 (1974-02-01), Howarth
patent: 3879607 (1975-04-01), Bjorklund
patent: 3981758 (1976-09-01), Thayer et al.
patent: 4134781 (1979-01-01), Carstens et al.
patent: 4306151 (1981-12-01), Chase
patent: 4314868 (1982-02-01), Hirakawa et al.
patent: 4345962 (1982-08-01), Cowley et al.
patent: 4497027 (1985-01-01), McGuire et al.
patent: 4733078 (1988-03-01), Sturm

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