Cold caustic fiberboard manufacture

• US 3,202,569 A
• Filed: 06/22/1961
• Issued: 08/24/1965
• Est. Priority Date: 06/22/1961
• Status: Expired due to Term

• Current Assignee: Gilbert Godin, William G. Coggan
• Original Assignee: Gilbert Godin, William G. Coggan
• Inventors: Coggan, William G., Godin, Gilbert
• Application Number:
  US04/118,883
• Time in Patent Office: 1,524 Days
• US Class Current: 162/13
• CPC Class Codes: C08L 2666/02 Organic macromolecular compounds, natural resins, waxes or and bituminous materials
• CPC Class Codes: C08L 97/02 Lignocellulosic material, e.g. wood, straw or bagasse manufacture of articles made from lignocellulosic material by dry processes B27N
• CPC Class Codes: D21C 3/22 Other features of pulping processes
• CPC Class Codes: D21J 1/00 Fibreboard preparation of pulp compositions or addition of chemical agents D21B, D21C, D21H; formation of the wet web D21F

Claims

1. A PROCESS FOR THE PRODUCTION OF WOOD FIBERBOARD COMPRISING THE STEPS OF DIGESTING HARDWOOD CHIPS IN A 2.5%-10%, BY WEIGHT, CAUSTIC SOLUTION FOR ABOUT 1/4 TO 2 HOURS AT ABOUT 70*F.-200*F. AND AT A PRESSURE IN THE APPROXIMATE RANGE OF FROM ATMOSPHERIC PRESSURE TO 300 P.S.I.G., SEPARATING THE DIGESTED CHIPS FROM THE BODY OF THE DIGESTING LIQUOR, REFINING THE DIGESTED CHIPS INTO A FIBROUS MASS, NEUTRALIZING THE SEPARATED FIBER MASS, FORMING A FURNISH COMPRISING THE REFINED FIBERS, FORMING A FIBROUS MAT FROM SAID FURNISH BY APPLYING PORTIONS OF THE FURNISH TO A FORAMINOUS SUPPORT AND PARTIALLY DEWATERING THE FURNISH ON SAID SUPPORT, SUFFICIENT FURNISH BEING APPLIED PER AREA OF SUPPORT TO CREATE A PARTIALLY DEWATERED WEB HAVING A THICKNESS OF AT LEAST ABOUT 1/2 INCH, AND THEN COMPRESSING SAID PARTIALLY DEWATERED BOARD TO REMOVE FURTHER WATER THEREFROM AND TO INCREASE THE DENSITY THEREOF.