Method of manufacturing dimensionally stable cellulosic fibre-based composite board and product
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United States of America Patent
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Issued Date -
Oct 24, 2002
app pub date -
Feb 14, 2001
filing date -
Feb 14, 2001
priority date (Note) -
Abandoned
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Abstract
A method for manufacturing a dimensionally stable composite cellulosic product having side and edge surfaces involves applying a sheet of thermoplastic material to at least one side surface of the composite product. Pressure and heat are applied for a pre-determined period via a heated press to melt the thermoplastic material to bond to and coat the at least one side surface of the product. The resulting product enjoys significantly improved dimensionally stability when exposed to water. Thickness swelling of the coated product is reduced by over 70% as compared to a conventional composite cellulosic product without the coating. In the case of oriented strand board (OSB) manufactured according to the method of the present invention, thickness swell of 2-5% after 24 hour water soaking is observed as compared to 10-15% swell with conventional OSB.
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