红锥锯材中试干燥工艺

 进行红锥Castanopsis hystrix锯材干燥中试，验证中试干燥基准的正确性，以求获得适于红锥生产应用的干燥基准。采用生产中广泛使用的强制气流循环式干燥窑，在给定的中试干燥基准下对红锥锯材实施干燥试验，并按照国家标准（GB/T 6491-1999）进行锯材干燥质量评定。中试结果表明：红锥锯材平均终含水率为7.24%，厚度含水率偏差为2.37%，应力指标为4.12%，平均顺弯度为0.17%，横弯度为0.25%，扭曲度为0.24%，瓦弯度为2.55%，纵裂度为3.31%，截面收缩为5.793%，无内裂，干燥至含水率12%时所用时间为138 h（5.75 d），干燥速度为0.31%·h^－1。中试干燥基准基本正确，总体干燥质量良好，基本达到木制品生产对红锥干燥质量的要求。图1表4参11

Pilot test drying process for Castanopsis hystrix lumber

To do Castanopsis hystrix wood drying pilot test，validation of pilot test drying schedule is correct，suitable for Castanopsis hystrix production and application of dry schedule. Forced air circulation for ordinary kiln drying，which is widely used in production，was utilized in a drying experiment of Castanopsis hystrix lumber with a given pilot drying schedule；Then，lumber dryness quality was evaluated according to the national standard （GB/T 6491-1999）. Pilot test results showed that the average final moisture content of Castanopsis hystrix lumber was 7.24%；moisture content for deviation of thickness was 2.37%；the stress index was 4.12%；the average camber parallel to the grain of the wood was 0.17%；the camber perpendicular to the grain was 0.25%；twisting degree was 0.24%；the tile-shaped camber was 2.55%；the longitudinal crack degree was 3.31%；the section shrinkage rate was 5.793%；there was no internal cracking；the time of drying to a moisture content of 12% was 138 h （5.75 d）；and drying speed was 0.31%·h^-1. Intermediate test drying benchmark was basic correct. Generally，the dryness quality of Castanopsis hystrix lumber was favorable and met the production requirements for wood products.［Ch，1 fig. 4 tab. 11 ref.］