Abitibi Paper Company, Ltd.

Stanley H Baldwin

Arnold E Willoughby

Pressed fiberboard is produced in an S-1-S type process at much shorter than normal (prior art) press cycles. The process includes the use of fiber furnish having preselected shrinkage characteristics. This furnish is wet formed into a mat either with or without a paper overlay, which overlay may be decorated or undecorated, depending on the desired end use and pressed wet as in the S-1-S process, using control means, such as stop bars in the hot press, to limit the final separation distance between the hot plates in each press opening to provide full caliper reduced density board. By using a fiber furnish having selected shrinkage characteristics it has been found that the pressed board can be safely removed from the press in a semi-cured, moist condition, at unusually short press cycles. The use of said fiber furnish also permits the use of higher than normal (prior art) press temperatures without incurring discloration of the paper overlays. The board is then baked and humidified to complete the curing process.

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Oakville, Canada

Stanley H Baldwin