Manufacture and performance of new structural shet material LVB made from small sized veneers

在日本，要求用国内种植木材的低等级部件生产一些新的结构板材材料。LVB（层压单板）由长度和宽度均为45-90cm的小尺寸单板组成，被认为是lauan胶合板的替代品之一。研究了日本柏木（HINOKI）和柳杉（SUGI） LVB的强度特性。试验结果总结如下：1 . LVB的MOE与lauan胶合板几乎相同贴面的端部接缝对产品的MOE没有影响HINOKI LVB的MOE和MOR均大于SUGI LVB， 13.7mm厚的HINOKI LVB在集中荷载下的弯曲性能不逊于12.5mm的lauan胶合板，且优于15mm的刨花板。通过安装机器人来安排小贴面，可以使加工生产线完全自动化。一般来说，LVB可以有效地从国内生长的软木材中制造出来，并且具有足够的强度。

In Japan, it is required to produce some new structural sheet materials from low grade components of the domestic plantation timbers. LVB (laminated veneer board) which is composed of small sized veneers such as 45-90cm both in length and width has been considered as one of the substitutes for lauan plywood.The strength properties of HINOKI (Japanese cypress) and SUGI (Cryptomeria) LVB were investigated. Tests results are summarized as follows;1 The MOE of LVB is almost the same as that of lauan plywood.2 There is no effecto of the end joints of the veneers on the MOE of the products.3 Both the MOE and the MOR of HINOKI LVB are larger than those of SUGI LVB.4 HINOKI LVB 13.7mm thick is not at all inferior to 12.5mm lauan plywood, and is for better than 15mm particleboard in bending performance under a concentrated load.It is possible to fully automate the processing line by fitting it with robots for arranging the small veneers.Generally, LVB can be manufactured from the domestic grown soft-woods efficiently and was found to have sufficient strength.