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开裂,是木材“三害”(虫、菌、裂)之一。一般硬杂原木往往在陆上保管一个时期后,其端部即开始呈多条状开裂,甚至发生通裂而减低或丧失其使用价值。开裂的原因主要是由于水分在木材中发生变化和与木材本身构造有关。1971年以来,我们遵循伟大领袖毛主席关于“人类总得不断地总结经验,有所发现,有所发明,有所创造,有所前进”的教导,对原木防裂作了一些试验。在试验过程中,广泛听取了群众的意见。大家认为,我国过去所采用的防裂涂料一般系油溶性的居多,且大都为黑
Cracking is the timber “three pests” (insects, bacteria, cracking) one. General hardwood logs are often stored on land for a period of time, the ends of which began to crack in multiple strips, or even cracked to reduce or lose its value. Cracking is mainly due to water changes in the wood and the construction of the wood itself. Since 1971, following the teachings of Chairman Mao, the great leader, on the principle of “human beings always summarize the experience, find something, invent something, create it, and make progress”, we made some experiments on crack prevention of logs. During the experiment, the opinions of the masses were widely heard. We believe that in the past we used anti-cracking coatings generally oil-soluble mostly, and mostly black