标准编号：ISO 16790:2021
中文名称：塑料 热塑性塑料在熔融状态下拉伸特性的测定
英文名称：Plastics — Determination of drawing characteristics of thermoplastics in the molten state
发布日期：2021-02
标准范围
This document specifies a method for determining the drawing and break characteristics of molten
plastics. The method involves the measurement of the force generated in deforming a molten filament
under defined extrusion temperature and drawing conditions.
Data is generated under non-isothermal and non-homogeneous deformation conditions. However, it is
useful for the interpretation of polymer behaviour in extensional flow.
The method is suitable for thermoplastics moulding and extrusion materials that can be extruded using
a capillary extrusion rheometer, or an extruder with capillary rod die or other extrusion devices and
have sufficient melt strength to be handled without difficulty.
The method is applicable to chemically stable materials that produce a uniform extrudate free from
heterogeneities, bubbles, unmelted impurities, etc.
This method can provide information on
— processability for all extrusion techniques,
— the effect of mechanical and thermal history, and
— the effect of chemical structure, such as branching, entanglements and molecular mass.
This technique is one of a number of techniques that can be used to measure the extensional flow
behaviour of a material. This method of measurement does not necessarily reproduce the drawing
conditions to which thermoplastics are subjected to during their processing.
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