GB/T 43015-2023 Synthetic fibre - Test method for shrinkage in hot air of staple fibres
1 Scope
This document describes the test method for shrinkage in hot air of synthetic staple fibres.
This document is applicable to synthetic staple fibres. It can be used as reference for other fibres such as composite staple fibres.
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 4146 (all parts) Textiles - Man-made fibers
GB/T 6529 Textiles - Standard atmospheres for conditioning and testing
GB/T 9994 Conventional moisture regains of textile materials
GB/T 14334 Sampling method for man-made staple fibres
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 4146 (all parts) apply.
4 Principle
The fibres are treated with dry hot air under specified conditions. Based on the length change of fibres before and after treatment in dry hot air, the shrinkage in hot air is calculated to characterize the thermal stability of the fibres.
5 Apparatus
5.1 Single fibre thermal shrinkage tester: Accurate to 0.01mm for length measurement.
5.2 Specimen tube.
5.3 Forceps or curved-tip forceps.
5.4 Tension clip or spring clip.
5.5 Clearer plate with a color in contrast with that of fibres.
5.6 Electric blast drying oven: Able to blast air from its side with power that shall not be less than 1.0kW, at a temperature with an allowable error of ±1℃.
5.7 Electronic scale: With an accuracy of not less than 0.1g.
6 Test preparation
6.1 Sampling
Take laboratory samples as specified in GB/T 14334.
6.2 Standard atmosphere for conditioning and testing
In accordance with GB/T 6529.
6.3 Conditioning of specimen
Take approximately 5g of fibres randomly from laboratory samples and condition them under standard atmospheric conditions until equilibrium is reached.
Otherwise, measure the conventional moisture regain (standard moisture regain if no conventional moisture regain is available) of the fibres according to GB/T 9994, and condition the fibres according to the conditioning time recommended in Table 1. The conditioning time is negotiable if otherwise specified.
Table 1 Recommended values for conditioning time
Conventional moisture regain or standard moisture regain (R0)
% 0≤R0≤2 2
Foreword II
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Apparatus
6 Test preparation
7 Test steps
8 Result calculation
9 Precision
10 Test report
Annex A (Normative) Calculation of statistical values and increased number of test fibres
Annex B (Informative) Precision test
