Method and apparatus for manufacturing composite wood panels

Details Method and apparatus for manufacturing composite wood panels Method and apparatus for manufacturing composite wood panels

B - Operations, Transporting

27

N

18/1011, 154/40,

B27N 3/00 (2006.01)

Patent

CA 1249115

ABSTRACT OF THE DISCLOSURE An improved hot gas pressing system for use in manufacturing wood-based composite panels reduces in-press time substantially while reducing blistering, pitting, and warping in the final panel. Condensable steam as the preferred gas is injected into both faces of the mat after the press closes to an intermediate position compressing the mat to an inter- mediate density. After the steam is applied for a predetermined time period at the intermediate density quickly raising the mat temperature, a steam-through step is applied after which the press is closed to its final position. Steam is reapplied to both surfaces of the densified mat to maintain temperature further reducing cure time of the adhesive after which venting and vacuum steps are applied to both surfaces of the mat to reduce internal pressure and remove moisture from the mat prior to opening of the press.

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