The influence of the raw and glue materials on the properties of wood-straw particleboards

Abstract

As results of experimental researches found here is the mechanism of influence of the raw material composition, glues upon physical and mechanical properties of wood-straw particleboards which were made after the production methods commonly accepted in manufacturing wood particleboards. Obtained are the data of regression dependence of water absorption, thickness swelling, crossbreaking and transverse tensile strength of wood-straw particleboards on the following factors: the content of straw particles in different chip mixtures and the types of glue, which can be used in the technological calculations pertaining to the manufacture of wood-straw particleboards. The 3-layer wood-straw particleboards, in the core and outer layers of which 25 per sent of straw particles was added to the woody ones, have lower indexes of water absorption and thickness swelling, also higher was transverse tensile strength and somewhat less was crossbreaking strength as compared to the boards, in which straw particles were added only to the core. The quality of boards, in which 25 per cent of straw particles was added both to the core and outer layers, and those with 10 per cent of straw particles being added to the core only, meet the state standard. The use of phenoloformaldehyde adhesives as compared to carbamideformaldehyde ones do not have a notable impact on the physical properties while the mechanical properties have improved. According to the formaldehyde content, wood-straw particleboards are referred to the emission class E 1. The increased amount of glue, in case of adding 15 per sent of straw particles to the particleboard, improves physical and mechanical properties of boards except for the stability of transverse tensile strength. Proposed and patented are methods of manufacturing particleboards using straw. The recommendations suggested were used during the manufacture of a test batch of wood particleboards with the use of straw at the enterprise “Swisspan Ltd”, the town of Kostopil. The results of the scientific research are used in the training process when studying the subjects such as “The technology of wood-based boards and plastics” and “Composite materials”.