Process for making a fiber overlay web for a composite board
Abstract
Abstract A PROCESS FOR MAKING A MOIST WEB FOR USE IN FORMING AN OVERLAY FOR A COMPOSITE ASSEMBLY OF BOARD OR PANEL COMPONENTS TO BE CURED IN A HOT PRESS, THE WEB BEING FORMED FROM A SLURRY OF CELLULOSIC FIBER PULP TO WHICH HAS BEEN ADDED A PROPORTIONATE AMOUNT OF A PALE, THERMOPLASTIC, NEUTRAL HYDROCARBON RESIN IN WATER SUSPENSION. AFTER THOROUGHLY MIXING THESE TOGETHER, ADDITIONAL QUANTITIES OF PARAFFINE WAX EMULSION SIZE AND OF PHENOL-FORMALDEHYDE RESIN ARE ADDED. AFTER THIS HAS BEEN THOROUGHLY MIXED THE PH IS ADJUSTED BY THE ADDITION OF A QUANTITY OF ALUM TO A VALUE OF FROM 4.5 TO 5. AN AQUEOUS PIGMENTED COLOR COATING MIXTURE IS THEN PREFERABLY APPLIED TO THE OUTER SURFACE OF THE WET WEB CONSISTING OF WATER, A BASIC POLYMER EMULSION SUCH AS VINYL ACRYLIC LATEX, VINYL ACETATE HOMOPOLYMER OR ACRYLATE ESTER COPOLYMER AND PIGMENT. THE RESULTANT SKINS OF THE PANEL EMERGIG FROM THE HOT PRESS SEPARATE FREELY FROM THE PLATENS OR CAUL PLATES WITH NO RESIDUE BUILDUP EVEN THOUGH THE LATTER MAY HAVE ROUGH OR UNEVEN PATTERN EMBOSSING SURFACES.
Inventors
- 👤 R Wheeler
Bibliographic Details
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