摘要:The water soluble phenol formaldehyde resin(PF) penetration into poplar flakes was investigated microscopically. The results of microscopic observation on the glue line and internal bond testing of the board showed that the condensed water would dilute PF and thus increase its flow and penetration into flakes. The results also indicated that the penetration into flakes decreased with increasing average molecular weight of the resin. It concludes that the resin with higher average molecular weight could be used in steaming vacuum pressing than the resin used in conventional pressing.
摘要:Quality of plywood made in China is briefly reviewed and analyzed in order to draw attention of relevant authorities and enterprises so that the plywood industry in China could be developed in a healthy way. The data were based on testing results provided by National Center for Supervision and Testing Quality of Wood based Panels.
摘要:The efficiency of anti mould and anti stain of rubberwood plywood treated with WFR 1 2 a was investigated. The results showed that the samples had superior effect on blue stain fungi and positive effect on other fungus.
关键词:flame retardant;Anti mould and anti stain;rubberwood;plywood
Teng Tonglian Zhou Yongdong Meng Jinming Chen Shenglan Piao Chenghan
Issue 2, (1999) DOI: 10.19455/j.mcgy.1999.02.005
摘要:The development of both elastic and plastic strains of timber surface and internal layers from fast growing plantation wood Populus tomentosa, Pinus massoniana etc. was studied. Results showed that the hardness level of drying schedules had much influence on both the drying strain developed and the time when it reached its maximum value. At the primary stage of drying, the maximum value of elastic tension strain of the timber surface increased with drying temperature rising, and decreased with increment of equilibrium moisture content ( EMC ). If the EMC could be correctly set at the primary stage of drying, the maximum value of the tension strain could be controlled and then good drying quality could be gained.
摘要:The reason of surface checks developed during post forming process of thermosetting resin impregnated decorative laminated sheet was discussed. And the prevention measures about the check was suggested, such as improving elasticity of impregnating resin, controlling moisture content of decorative laminated sheet, controlling pressing speed, and controlling bending radius etc.
摘要:Components of dyeing solution of water soluble dyestuff and dyeing process are introduced in this paper. Parameters of wood dyeing including surface dyeing and inner dyeing were given in detail. Several important factors affecting wood dyeing were discussed. Suggestions on developing wood dyeing industry in China were expressed.
摘要:Based on character of structure formation of urea formaldehyde (UF)resin, a new synthesizing technology was designed for making low formaldehyde emission UF resin for bagasse medium density fiberboard(MDF). Commercial bagasse MDF made with UF resins synthesized with the technology showed reduced formaldehyde emission (approximate 20 mg/100g) with satisfied strength property.
摘要:Pallet is a kind of tool for storing and transporting goods.Molded particle pallet is produced with branch and small diameter wood so that utilization ratio of wood is raised.This paper studied key process in manufacturing molded particle pallet.Wood species used were poplar and pine.Testing results showed that the performance of molded particle pallet was as same as that of pallet made of lumber.
摘要:Chemical construction changes of components in esterification between wood and polycarboxylic were analyzed by electron spectroscopy for chemical analysis(ESCA) in this paper.ESCA spectra showed with increment in BTCA concentration,the ratios of C 1(alkyl carbon) and C 4(carbon of carboxyl and ester)were increased and C 2(hydroxyl carbon)in C 1s decreased;the ratios of O 1(oxygen of carboxyl and ester) were increased and O 3(hydroxyl oxygen)in O 1s decreased.This proved that esterification between polycarboxylic acid—1,2,3,4 butanetetracarboxylic acid (BTCA) and wood components occurred at elevated temperature with catalyst.This conclusion was in correspondence with analysis of FTIR and CP/MAS 13 C NMR spectra.
摘要:Since quality of wafer is one of the most critical factors to affect final quality of bamboo based waferboard, it is necessary to investigate main wafering factors affecting wafer quality, such as knife gap, cutting angle and cutting speed. Experimental testing results on bamboo species Dendrocalamus giganteus and Pleioblastus amarus with flatness and thickness deviation as quality indicators determined the best quality of the wafer, as well as the optimum wafering conditions through a series of single factor experiments and multi factor orthogonal experiments.
摘要:This article analyzed the potential of saving energy and its possibilities in wood based panel factories by optimizing technological designing and adopting new techniques.
摘要:Prunus wood floor surface was chemical treated. The results showed that: 1) 70%~80% of the tested specimen could be upgraded according to National Standard GB/T 15036-94; 2) anti mould property was improved; 3) finishing safety was satisfied.