Compression control and its significance in the manufacture and effects on properties of poplar LVL

✍ Scribed by H. J. Zhang; Y. H. Chui; M. H. Schneider

• Book ID: 104662690
• Publisher: Springer
• Year: 1994
• Tongue: English
• Weight: 306 KB
• Volume: 28
• Category: Article
• ISSN: 0043-7719
• DOI: 10.1007/bf00204214

✦ Synopsis

In order to control the compression effectively, the main processing parameters for hot-pressing of poplar LVL were investigated in this study. Results from an orthogonal experiment show qualitatively that compression of poplar LVL is influenced by pressing pressure and moisture content of the veneers. High press pressure and veneer moisture content lead to high compression during hot pressing. It is shown that compression has significant effects on modulus of elasticity, modulus of rupture, specific gravity and thickness swelling of poplar LVL. Modulus of elasticity, modulus of rupture and specific gravity appear to be directly proportional to compression within the compression range of 5% to 20%. Horizontal shear strength results indicate that, due to inadequate contact, proper glue bond may not be achieved between veneers of LVL with low compression. Thickness swelling appears not sensitive to compression between the compression range of 4% to 10%.