stress slackness

During the designation of packer, the dissertation approaches the stress slackness of chip. That optimizes the designation of packer, and guide actual designation and use.
在进行木片压缩打包机设计的同时，本文还对木片应力松弛作了一定的探讨，优化了打包机的设计，对木片压缩打包机的设计及使用具有实际的指导意义。