一年生植物作为石膏刨花板原料的适应性

本文叙述了使用德国及中国建筑石膏和甘蔗渣、竹材、棉秆、麦秸、稻草等一年生植物生产石膏刨花板的适应性,分析了石膏的成分和性能,测定了缓凝剂和植物原料对石膏水化的影响。制板时采用不同的配方和板的密度,以评价一年生植物的使用价值。在所使用的原料中,甘蔗渣是良好的石膏刨花板原料。

Suitability of annual plants for gypsum-bonded particleboards

The semi-dry process for the manufacture of gypsum-bonded particleboards suggested by Kossatz besides the use of wood particles offers also the possibility of employing annual plants for this purpose. Using a Chinese and a German Beta-hemihydrate gypsum plaster the suitability of bagasse, bamboo, cotton stems, rice straw and wheat straw was investigated. Besides phase-analytical investigations regarding the characterization of the binders also the efficacy of various retardants as well as the influence of the different plant substances on the hydration were determined. Test boards of varying formulas and density were manufactured from annual plants in order to evaluate the suitability of same. The considerably retarded hydration of the gypsum plaster which was due to the different plant substances does not necessarily lead to boards with low strength properties as well as a moderate impairment compulsorily leads to boards with high strength properties.As far as the board strength is concerned, equal importance has to be attached to the surface condition of the particles, their spraying behaviour and pore structure, as well as to the fineness ratio of the particles and the portion of plant parts which cannot be broken up to particle-shape structures.