STRAW PULP AS A SECONDARY LIGNOCELLULOSIC RAW MATERIAL AND ITS IMPACT ON PROPERTIES OF INSULATING FIBERBOARDS PART III. PREPARATION OF INSULATING FIBERBOARDS FROM SEPARATELY MILLED LIGNOCELLULOSIC RAW MATERIALS

摘要

Effect of the addition of straw pulp as a partial replacement of coniferous wood pulp in the preparation of insulating fiberboards (IFB) on its properties is described in the work. A preparation of straw pulp from wheat straw and its characterization with the subsequent laboratory preparation of straw insulating fibreboards (SIFB) has been described in Part I. A preparation of mixed pulp prepared by jointly grinding of straw and wood pulp for the required percentage content is described in Part II. A preparation of fibers obtained by a separate milling of wood particles and straw in pilot conditions and their mixing for a desired ratio of wood and straw pulp is described in Part III. The pulp is characterized by a fractional composition of fiber length, determining the water retention value (WRV), dewatering rate and defibering degrees (DD). 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 was determined as well.