FREE-CLOSE MOLDING VERSUS MOLDING TO STOPS IN WOOD-RESIN BLEND PROCESSING.
Abstract
The influence of the manner and degree of compression on some physical and mechanical properties of molded wood-resin blends was studied. Yellow birch (Betula alleghaniensis) and Douglasfir (Pseudotsuga menziesii var. menziesii) particles, processed from .015-inch by 1-inch flakes, were used. The properties evaluated were modulus of rupture, modulus of elasticity, dimensional stability, water absorption, and flow. Flow was considered to be the ability of a blend to move in directions at right angles to an applied force. A method for evaluating such flow is described. Toward the upper limit of the compressive range, the degree of compression is more important than the manner (rate) of compression. Along with resin content, the degree of compression controls the formation of glue bonds which, in turn, control the properties of the molded product. The primary importance of species and particle size is in the influence of these variables on effective mat compression. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1965
- Accession Number
- AD0465898
Entities
People
- B. G. Heebink
- C. J. Gatchell
Organizations
- Forest Products Laboratory