B - Operations – Transporting – 27 – D
Patent
B - Operations, Transporting
27
D
144/118
B27D 3/00 (2006.01)
Patent
CA 1220406
ABSTRACT OF THE DISCLOSURE A method and apparatus for pressing plywood is disclosed. A stack of wood veneer sheets having a layer of adhesive arranged between successive sheets is pressed together between a pair of pressing platens with a given pressure for a first period of time. The platens are then held in a first relative platen press- ing position for a second period of time. The first relative position corresponds with the position reached by the pressing platens at the end of the first period of time. As a result of the pressing method, compression of the wood veneers is minimized, thereby permitting the use of thinner veneers. A transducer is provided for sensing the first relative pressing position of the platens at the end of the first period of time and for producing a signal during the second period of time corresponding with the deviation of the platens from the first relative position. In response to the deviation signal, the pressing platens are returned to the first position. In order to enhance the adhesive bond between successive sheets of the stack, heat is applied to the stack during the first and second periods of time.
458155
Hall Thomas D.
Huffman Howard L.
Boise Cascade Corporation
Gowling Lafleur Henderson Llp
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