STRAW PULP AS A SECONDARY LIGNOCELLULOSIC RAW MATERIAL AND ITS IMPACT ON PROPERTIES OF INSULATING FIBERBOARDS PART II. PREPARATION OF INSULATED FIBERBOARDS WITH STRAW FIBER CONTENT

摘要

The paper describes the effect of an addition of straw pulp as a partial refund of softwood pulp in the preparation of insulating fibreboard (IFB) on its properties. A preparation of straw pulp from wheat straw and its characterization with the subsequent laboratory preparation of straw insulation fibre board's (SIFB) has been described in Part I. A preparation of mixed pulp prepared by jointly grinding and mixing of straw and wood pulp for required percentage content is described in Part II. The pulp is characterized by fractional composition of fiber length, determining the water retention value (WRV), dewatering rate and defibering degrees (DD). Uncompressed wood - straw insulating fiberboards with various content of straw pulp were prepared from thus characterized pulp. Strength properties - flexural strength and tensile strength perpendicular to the face (internal bond strength) and physical properties - swelling and water absorption were determined for prepared plates. A coefficient of thermal conductivity to characterize the thermal properties of the insulation boards was determined as well.