Preparing hot-moldable thermosetting resin and cellulose fiber mixtures
First Claim
6. THE METHOD WHICH COMPRISES MECHANICALLY RUBBING AND DEFIBERING WOOD IN AN ENVIRONMENT OF STEAM AT A PRESSURE IN THE RANGE FROM 50 TO 200 POUNDS PER SQUARE INCH GAUGE AND AT A TEMPERATURE AT WHICH LIGNIN CONTENT OF THE WOOD IS SOFTENED TO FACILITATE DEFIBRATION TO SUBSTANTIALLY ULTIMATE WOOD FIBERS AND OPENED-UP AGGREGATES OF ULTIMATE FIBERS FOR A TIME IN THE RANGE FROM 30 SECONDS TO 6 MINUTES AND THE TIME OF EXPOSURE TO STEAM BEING SUFFICIENTLY SHORT TO PRESERVE WITHIN THE FIBERS SUBSTANTIALLY ALL THE CONTENT OF THE WOOD AND NOT OVER ABOUT 120 SECONDS AT 200 POUNDS PER SQUARE INCH GAUGE, WHEREBY THE RESULTING MOIST MASS OF FIBERS CONTAINS INCREASED CONTENTS OF WATER-SOLUBLE MATERIAL AND OF ACID, DISTRIBUTING ONTO THE SAID FIBERS SUSPENDED IN A MOVING STREAM IN A VEHICLE OF STEAM AN AQUEOUS SOLUTION OF THERMOSETTING RESIN-FORMING MATERIAL WHICH SOLUTION HAS A PH ABOVE THAT OF THE FIBERS AND IS CHARACTERIZED BY PRECIPITABILITY OF RESIN-FORMING SOLIDS AT A LOWERED PH VALUE, THE QUANTITY OF SAID SOLUTION BEING LIMITED FOR A PRECIPITATION OF ALL THE RESIN SOLIDS THEREIN BY ACID IN THE FIBERS, WHEREBY THE ACID IN THE FIBERS EFFECTS PRECIPITATION OF SAID SOLIDS ON THE FIBERS, MOVING THE COATED FIBERS IN A VEHICLE OF DEHYDRATING GAS AT NON-THERMOSETTING TEMPERATURE AND TIME FOR SAID SOLIDS AND THEREBY QUICKLY REDUCING THE MOISTURE CONTENT OF SAID COATED FIBERS ARE CONTENT NOT OVER 60% BY WEIGHT, WHEREBY SAID FIBERS ARE NON-COHERENT IN MASS FORM EXCEPT FOR MECHANICAL INTERFELTING, AND SEPARATING THE FIBERS FROM THE RESULTING MOISTURE-LADEN AIR AS A MASS OF FELTABLE THERMOSETTING FIBERS.
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Accused Products
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Citations
7 Claims
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6. THE METHOD WHICH COMPRISES MECHANICALLY RUBBING AND DEFIBERING WOOD IN AN ENVIRONMENT OF STEAM AT A PRESSURE IN THE RANGE FROM 50 TO 200 POUNDS PER SQUARE INCH GAUGE AND AT A TEMPERATURE AT WHICH LIGNIN CONTENT OF THE WOOD IS SOFTENED TO FACILITATE DEFIBRATION TO SUBSTANTIALLY ULTIMATE WOOD FIBERS AND OPENED-UP AGGREGATES OF ULTIMATE FIBERS FOR A TIME IN THE RANGE FROM 30 SECONDS TO 6 MINUTES AND THE TIME OF EXPOSURE TO STEAM BEING SUFFICIENTLY SHORT TO PRESERVE WITHIN THE FIBERS SUBSTANTIALLY ALL THE CONTENT OF THE WOOD AND NOT OVER ABOUT 120 SECONDS AT 200 POUNDS PER SQUARE INCH GAUGE, WHEREBY THE RESULTING MOIST MASS OF FIBERS CONTAINS INCREASED CONTENTS OF WATER-SOLUBLE MATERIAL AND OF ACID, DISTRIBUTING ONTO THE SAID FIBERS SUSPENDED IN A MOVING STREAM IN A VEHICLE OF STEAM AN AQUEOUS SOLUTION OF THERMOSETTING RESIN-FORMING MATERIAL WHICH SOLUTION HAS A PH ABOVE THAT OF THE FIBERS AND IS CHARACTERIZED BY PRECIPITABILITY OF RESIN-FORMING SOLIDS AT A LOWERED PH VALUE, THE QUANTITY OF SAID SOLUTION BEING LIMITED FOR A PRECIPITATION OF ALL THE RESIN SOLIDS THEREIN BY ACID IN THE FIBERS, WHEREBY THE ACID IN THE FIBERS EFFECTS PRECIPITATION OF SAID SOLIDS ON THE FIBERS, MOVING THE COATED FIBERS IN A VEHICLE OF DEHYDRATING GAS AT NON-THERMOSETTING TEMPERATURE AND TIME FOR SAID SOLIDS AND THEREBY QUICKLY REDUCING THE MOISTURE CONTENT OF SAID COATED FIBERS ARE CONTENT NOT OVER 60% BY WEIGHT, WHEREBY SAID FIBERS ARE NON-COHERENT IN MASS FORM EXCEPT FOR MECHANICAL INTERFELTING, AND SEPARATING THE FIBERS FROM THE RESULTING MOISTURE-LADEN AIR AS A MASS OF FELTABLE THERMOSETTING FIBERS.
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7. THE METHOD OF CLAIM 6 WHEREIN THE DISSOLVED RESINOUS MATERIAL IS A PHENOL-FORMALDEHYDE CONDENSATION PRODUCT.
Specification
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Current AssigneeClark C. Heritage
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Original AssigneeClark C. Heritage
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InventorsHeritage, Clark C.
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Application NumberUS03/334,164Time in Patent Office1,278 DaysField of SearchUS Class Current523/326CPC Class CodesB27N 3/14 Distributing or orienting t...C08L 2666/02 Organic macromolecular comp...C08L 61/06 of aldehydes with phenolsC08L 97/02 Lignocellulosic material, e...
