为研制直径5英寸球体组织等效(TE)正比计数器,需将TE塑料颗粒铸模得到灵敏腔体。TE塑料铸模有两种基本方法,即压缩和注射铸模,本工作采用压缩铸模方法。铸模首先设计模具(图1),模具的基本部件包括:基底、模腔、外体和活塞。在外体的顶部有1个柱颈用于存放制模之前无法装入模具的过量塑料颗粒。压缩方法中 For the development of a 5-inch diameter sphere tissue equivalent (TE) proportional counter, TE plastic pellets are to be molded into a sensitive chamber. TE plastic mold has two basic methods, namely compression and injection mold, the work of the compression molding method. Mold first mold design (Figure 1), the basic components of the mold include: the base, the cavity, the outer body and the piston. At the top of the outer body there is a neck that holds excess plastic particles that can not fit into the mold before molding. Compression method