Method for reducing edge curl on green sheets

Details Method for reducing edge curl on green sheets Method for reducing edge curl on green sheets

1988-05-26

1989-02-28

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Treating shaped or solid article

To swell or plasticize

34 34, 34 50, 264 58, 264 61, 264 65, 264344, 264DIG39, B29C 7100, C04B 4181, F26B 2108, F27D 702

Patent

active

048083658

ABSTRACT:
A process for reducing edge curl in green sheets in which the sheets are first placed in a chamber at about 95% relative humidity for a period of about 2 weeks at room temperature. In this part of the process, the sheets absorb water which causes the internal stresses in the green sheet to relax. Thereafter, the sheets are dried by placing them in a chamber at about 35% relative humidity for a period of about 1 week at room temperature. In this period, the absorbed water evaporates and the green sheets become firm with less edge curl than they exhibited prior to the treatment.

REFERENCES:
patent: 2274426 (1942-02-01), Miller
patent: 3148955 (1964-09-01), Nichols
patent: 3953562 (1976-04-01), Hait et al.
patent: 4340436 (1982-07-01), Dubetsky et al.
patent: 4497677 (1985-02-01), Sanada et al.

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