The veneer then passes through a gluing machine that applies a thin layer of waterproof adhesive. Once dried and trimmed, the sheets pass through a sander or grinder that flattens and smooths them to a consistent thickness. The veneer sheet is then dried with hot air, causing it to shrink some, and then it is trimmed to size for LVL production. The logs are debarked, pressure steamed with a mix of water vapor and chemicals for 48-hours, and then run through a veneer peeler that ‘unrolls’ the log into a continuous sheet with a thickness between 1/16” and 1/4”. It is made in a similar manner to plywood using softwood veneer logs or peelers. LVL or laminated veneer lumber was used to make propellers for aircraft in WW2 but didn’t become a construction material until the mid-1970s.
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