ISO 294-5:2011 塑料 热塑性材料试样的注塑成型 第5部分：用于调查各向异性的标准试样的制备

标准编号：ISO 294-5:2011

中文名称：塑料 热塑性材料试样的注塑成型 第5部分：用于调查各向异性的标准试样的制备

英文名称：Plastics — Injection moulding of test specimens of thermoplastic materials — Part 5: Preparation of standard specimens for investigating anisotropy

发布日期：2011-04

标准范围

ISO 294-5:2011规定了一种双腔模具（指定为F型ISO模具），用于注射成型80 mm x 90 mm板材，单点数据采集的首选厚度为2 mm，因为已发现2 mm具有最大的各向异性特性，对注射速率只有轻微的敏感性。对于塑料零件的设计，这将提供拉伸性能的上限和下限。由于模具填充率和零件几何形状对各向异性的影响，将板材厚度与给定零件厚度匹配不是合适的标准。然后对合适的试样[ISO 527？2 1BA型拉伸试样或1型（80 mm x 10 mm）棒材]进行机加工或模切，并用于获取热塑性零件各向异性的信息。材料各向异性调查是一种特殊程序，旨在为最终用途的模塑件设计提供指导，而不是作为质量控制工具。在热塑性材料的注射成型中，熔融聚合物的流动可能会影响填料（如玻璃纤维）的取向或聚合物链的取向。这可能会导致各向异性行为。各向异性行为的知识在设计塑料零件时很有价值。

ISO 294-5:2011 specifies a two-cavity mould (designated the type F ISO mould) for the injection moulding of 80 mm x 90 mm plates with a preferred thickness of 2 mm for single-point data acquisition because 2 mm has been found to provide the maximum anisotropic properties, with only a slight sensitivity to the rate of injection. For the design of plastic parts, this will provide upper and lower bounds for the tensile properties. Matching the plate thickness to a given part thickness is not a suitable criterion because of the effect of mould filling rate and part geometry on anisotropy. Suitable test specimens [ISO 527？2 type 1BA tensile test specimens or type 1 (80 mm x 10 mm) bars] are then machined or die-cut from the plates and used to obtain information on the anisotropy of thermoplastic parts.Investigation of the anisotropy of materials is a special procedure intended to provide guidance in the design of mouldings for end-use applications and is not intended as a quality control tool.In the injection moulding of thermoplastic materials, the flow of molten polymer may influence the orientation of fillers such as fibreglass or the orientation of polymer chains. This can result in anisotropic behaviour. The knowledge of anisotropic behaviour is valuable in designing plastic parts.

标准预览图