农业纤维物料压缩研究发展现状

全面分析了国内外关于农业纤维物料压缩研究的现状，指出了存在的问题，即：1）过去的研究多属“闭式”压缩试验研究；2）理论研究与实验脱节；3）对压缩过程中的影响因素考虑得不够全面；4）对压缩过程中被压缩物料的流变学特性研究不够。同时指出今后应加强研究的几个方面：1）以不同喂入量、不同压缩频率压缩时的蠕变和应力松弛问题；2）压缩室内草片和草捆在不同位置时的蠕变和应力松弛问题；3）草捆从压缩室出口释放时的膨胀和张力；4）综合考虑压力、压缩频率、喂入量、压缩室长度和草捆长度等对压缩过程的影响。

Compression of Agricultural Fibrous Materials

The state-of-the-arts on compression of agricultural flbrous materials at home and abroad is reviewed. Some problems are pointed out, those are: 1) ln most of the studies,compression of agricultural fibrous materials were made only in closed-end dies; 2)Theoretical study is separated from the practice; 3)Some factors affecting com-pression are not considered overally; 4)Only simple rheologic characteristics of agricul-tural fibrous materials during being compressed is studied. Some study directions to be taken in the future are pointed out: 1)Creep and relaxation of agricultural fibrous tnate-rials should be studied during compressing in different charge amount and different compressing frequency; 2)The creep and relaxation of straw pieces and bales at differ-ent position in the chamber should be studied; 3) The expansion and tensile stress of a bale should be studied when it is released from chamber; 4) The factors,include press-ing force, compressing frequency, charge arnount,chamber length,bale length, humidi-ty and power comsumption,should be considered synthetically.