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Standards Development
This document specifies a method for determination of dynamic thermal drawing force of partially oriented synthetic filament yarns.
It is applicable to partially oriented polyester PET, polyamide, polypropylene filament yarns, with a linear density less than 500 dtex.
For those yarns not applicable, an appropriate test method will be determined as agreement.
Purpose:
Among the three major conventional synthetic fibre products (polyester, polypropylene and polyamide), more than 60% are partially oriented yarns (POY). Most of them are processed by texturing machines, before being used for textile weaving.
Dynamic thermal drawing force test of synthetic partially oriented yarns (POY) is a physical testing method close to the post-processing procedure. It mainly determines the force required to draw running filament yarns to a specific ratio when being heated and control its uniformity. Thus, abnormal tension and running-broken ends are effectively reduced in subsequent texturing-process.
Lack or inconsistency of indicators of thermal dynamic drawing force is not conducive to downstream users' quality control and process adjustment. Therefore, it is necessary to develop a unified international method standard to provide support for production quality control of partially oriented yarns (POY) and regulate the market. The standard has realistic guiding significance. Justification:
The dynamic thermal drawing force test of synthetic partially oriented yarns (POY) is to continuously test 100 meters of yarns, whereas test conditions combined with post-processing procedure. Compared with the determination of birefringence, cold tensile stress-strain, boiling-water shrinkage and so on, it is more practical and most objectively to characterize orientation and crystallization of continuous partially oriented yarns (POY).
Many synthetic fibre enterprises use similar methods to evaluate internal quality of partially oriented yarns (POY). However, the scope and test conditions of these methods are not unified. There are such problems as small scope, inconsistent conditions, difference to automatic equipment, and so on. This document is applicable to polyester PET, polyamide, polypropylene and etc. With the advancement of instrument technology, the linear density range is expanded accordingly. Based on thermal analysis and study of influence factors, test conditions are re-defined. Moreover, test speed and test length are unified as much as possible.
This document focuses on the international operability of method standard. The scope of application is clear and the technical content is mature.
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