標準號：BS EN ISO 294-4-2003
中文標準名稱：塑料.熱塑塑料試樣的注射成形.第4部分:模型收縮率的測定
英文標準名稱：Plastics - Injection moulding of test specimens of thermoplastic materials - Determination of moulding shrinkage
標準類型：G31
發(fā)布日期：2003/2/28 12:00:00
實施日期：2003/2/28 12:00:00
中國標準分類號：G31
國際標準分類號：83.080.20
引用標準：ISO 294-1-1996;ISO 294-3-2002
適用范圍：This part of ISO 294 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 part of ISO 294 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^. Moulding shrinkage as defined in this part of ISO 294 represents the so-called free shrinkage with unrestricted deformation of the cooling plates in the mould during the hold period. It may be considered therefore as the maximum value of any restricted shrinkage.