摘要:The feasibility of manufacturing rice-straw particleboard was discussed when UF resin or the mixtures of UF resin and polymethylene diphenyldiisocyanate (PMDI) were used as binders. The results showed that it was very difficult to produce a board with rather high strength when only UF resin was applied as a binder. However, the adhesion of UF resin to the surface of rice-straw was enhanced obviously by modification with PMDI. Based of study, the optimum technical conditions for making rice-straw particleboard were proposed.
摘要:Temperature in core of mat(TCM) is always influenced by atmospheric temperature when particleboard production building has neither heating system nor heat-retaining measure. When atmospheric temperature is 38℃ TCM may be 40℃ and lower than 8℃ if atmospheric temperature is-7℃. Hot press time must be longer than the normal one if TCM is lower than 15℃, what is more, blow may occur at any moment. On the contrary, relative high TCM, for example, 25℃ is good for shortening press circle. To ensure that partieleboard production has high efficiency, TCM must be controlled. For this purpose heating the air that flows into mat forming machine is remarkable effective and economical. It is also feasible in technology.
摘要:In this paper, the approaches to manufacturing of glued-compressed wood for structural purposes with Chinese fir rod are dealt with, better technological parameters are offered; and approaches to the product properties affected by the parameters are also dealt with.
关键词:Chinese Fir;Chinese Fir thinnings;Glued-compressed wood
摘要:In this paper, the structural characteristics of two overhead-fan kilns were described. Based on the data about velocity of air flowing through the stack, ratio of recirculating air, difference between ambient temperature and that of the kilns wall, advantages and defects of the two kilns were clarified. Finaly, a drying schedule for rubber wood was introduced and description about the autocontrol process was included.
关键词:Rubber wood;Overhead-fan kilns;Ratio of recirculating air;drying schedule
摘要:In an experimental stand of intensive management in Zhizhong County, Sichuan Province, plants of Paulownia clone C020 and 5 Paulownia check plants were collected for the studies. Through experiments of many items, the results showed that the length of the wood fibre and the relative crystallization degree of cellulose and microfibrillar angle are better than those of the checks. But the holocellulose and alpha cellulose of its chemical components and the main indices of strength properties of wood are lower than those of the checks. Its yield rate of pulp-making is low When a comparison of the physical properties of its sheet pulp with those of 2 Acacia spp. is made, the result shows that the former is close to or better than the latter.
摘要:For the technical demands of low pressure short cycle decorative laminating process, high temperaure and high speed, main problems such as machine frame set, hot plate, oil cylinder and its layout, heating system, hydraulic system should be thought of carefully when the single daylight hot press was designed.
关键词:Low pressure short cycle decorative laminating process;Single daylight hot press.