tailieunhanh - Báo cáo lâm nghiệp: "A contribution to the resistance of combined plywood materials to abrasion"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: A contribution to the resistance of combined plywood materials to abrasion. | JOURNAL OF FOREST SCIENCE 54 2008 1 31-39 A contribution to the resistance of combined plywood materials to abrasion P. Král J. Hrazsky Faculty of Forestry and Wood Technology Mendel University of Agriculture and Forestry in Brno Brno Czech Republic ABSTRACT The aim of the paper was to propose the methodology of testing the abrasion resistance of combined water-proof plywood materials with the phenol-formaldehyde foil surface finish and to assess the surface resistance of a new combined plywood material of a given construction to abrasion. For sheathing phenol-formaldehyde foils with the low content of resins were used which are combined with unwoven and woven glass fibres highly resistant to mechanical wear. The paper for phenol-formaldehyde foils manufactured of sulphate pulp basis weight 60 g m2 was impregnated by a low-molecular resin with the resin deposit 150 DM dry matter per paper DM. To evaluate the newly designed material our testing methodology was prepared in such a way that it will conform to related European standards. It is completed by the method of sampling and preparation of samples for tests including their acclimation. According to our proposal measurements were carried out of selected constructions of water-resistant plied veneer materials with jackets of various basis weight combined with glass fibres. Data on the abrasion resistance were acquired which can be considered to be reliable. The values of abrasion resistance were assessed with respect to standards valid in the EU which determine fields of their use. Keywords abrasion resistance foliated plywood phenol foil glass fibre high-pressure laminate abrasion phenolformaldehyde resin Taber abraser The surface of materials with glass fibre shows specific properties. Before the actual assessment of abrasion resistance the methodology of testing the abrasion resistance of combined water-proof plywood materials with the phenol-formaldehyde foil surface finish without and with fibreglass was .