Apparatus for heating a fleece
Method for heat treatment of fibrous mats
Forming apparatus and method
Method of pressing reconstituted lignocellulosic materials Patent #: 4393019
ApplicationNo. 06/599599 filed on 04/13/1984
US Classes:264/83, Work is organic material156/285, Direct application of vacuum or fluid pressure during bonding156/296, Strands, rods, tubes or sticklike bodies to each other only156/312, Sequential different pressure applying156/62.2, With formation of lamina by bulk deposition of discrete particles to form self-supporting article264/102, To degas or prevent gas entrapment264/109, FORMING ARTICLES BY UNITING RANDOMLY ASSOCIATED PARTICLES264/120Plural, intermittent pressure applying
ExaminersPrimary: Wityshyn, Michael G.
International ClassB27N 3/08 (20060101)
AbstractAn 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 intermediate 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.
Field of SearchWith formation of lamina by bulk deposition of discrete particles to form self-supporting article
Direct application of vacuum or fluid pressure during bonding
To remove gas from between assembled laminae
Strands, rods, tubes or sticklike bodies to each other only
By curing of nonfully polymerized self-sustaining lamina