IMPREGNERAT PAPPER OCH FORFARANDE FOR DESS FRAMSTELLNING

摘要

The paper contains a pre-condensate phenolic resin in which free carbon dioxide-containing bubbles are present and is manufactured by impregnating a paper with an aqueous impregnating solution of a phenol/formaldehyde pre-condensate containing a carbonate, followed by drying and partial curing of said pre-condensate under conditions which result in release of carbon dioxide containing bubbles. The paper may be laminated to plywood by hot pressing to complete curing of the resin. The carbon dioxide provides a combination of long shelf-life for the impregnated paper and rapid completion of the curing.