标准摘要
[中文适用范围]： 本文件规定了测定热塑性材料注射成型试样在平行于和垂直于熔体流动方向的方向上的成型收缩率和成型后收缩率的方法。 有关热固性塑料收缩率的测定，请参见 ISO 2577[2]。 本文件中定义的成型收缩率不包括吸湿的影响。 这包含在成型后收缩率中，因此也包含在总收缩率中。 对于仅因吸湿而导致成型后收缩的情况，请参阅 ISO 175[1]。 本文件中定义的成型收缩率表示在保压期间模具中冷却板不受限制变形的所谓自由收缩率。 因此，它被认为是任何限制收缩的最大值。 [外文原描述]： This document specifies a method of determining the moulding shrinkage and post-moulding shrinkage of injection-moulded test specimens of thermoplastic material in the directions parallel to and normal to the direction of melt flow. For the determination of shrinkage of thermosets, see ISO 2577 [2] . Moulding shrinkage as defined in this document excludes the effects of humidity uptake. This is included in post-moulding shrinkage and thus in total shrinkage. For cases when post-moulding shrinkage is caused by the uptake of humidity only, see ISO 175[1]. Moulding shrinkage as defined in this document represents the so-called free shrinkage with unrestricted deformation of the cooling plates in the mould during the hold period. It is considered, therefore, as the maximum value of any restricted shrinkage.
英文名称Plastics — Injection moulding of test specimens of thermoplastic materials — Part 4: Determination of moulding shrinkage