1. LVL AS A CONSTRUCTION MATERIAL Figure 1.28. Peeling line, from block centring (left) to veneer mat clipping and stacking (right). A colour camera technique is used to recognize and analyse even the smallest details on the veneer mat, such as knots, holes, splits, bark and rot. Based on this camera analysis, the system optimizes the points at which the mat is to be cut. The mat is then clipped into sheets. Defects such as splits, fishtails and large holes are cut out according to predefined parameters. The clipped veneers are stacked in different bins according to their size and moisture content. Softwood is typically sorted into two or three moisture grades as the moisture content can Figure1.29. Drying line. vary widely, from 30% to over 150%. Sorting of veneers according to moisture content enhances the efficiency of drying and attainment of the desired final moisture content. 1.6.3 Drying and grading the veneer The aim of the drying process is to dry the green veneers to a moisture content suitable for gluing. Too high veneer moisture hampers gluing and generates steam during hot pressing. 28 LVL Handbook Europe
RkJQdWJsaXNoZXIy MjU0MzgwNw==