RADIO-FREQUENCY METHODS FOR ENGINEERED WOOD PRODUCTS
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United States of America Patent
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Issued Date -
Dec 15, 2016
app pub date -
Jun 10, 2016
filing date -
Jun 15, 2015
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Abstract
Radio-frequency methods for engineered wood products (EWPs), such as thick EWP products and plywood having higher moisture contents are disclosed. For thick EWP products, intermittent RF is used as the sole energy source to heat the thick EWPs. This method for thick EWPs yields a higher panel MC of 9-12% compared to 5-8% from conventional hot pressing. The RF heating process facilitates manufacturing of structural composite lumber (SCL) products including LVL, oriented strand lumber (OSL) and veneer strand lumber (VSL) in addition to sawn lumber. For plywood products, a method of using RF in pre-pressing of stack of veneer layers for preparation of plywood is developed. In a preferred embodiment a conventional cold pre-press is retrofitted with a radio-frequency (RF) generator that pre-heats the stack of veneer layers to 60-80° C. under pressure. The pre-heating allows for a final hot press at lower press temperature and higher MC within the stack.
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