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GB/T 41420-2022 (GB/T41420-2022)

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GB/T 41420-2022: PDF in English (GBT 41420-2022)

GB/T 41420-2022
ICS 59.080.30
CCS W 04
Textile -- Determination and evaluation for shape memory
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and Definitions ... 4
4 Principles ... 5
5 Atmosphere for humidity control and test ... 5
6 Instruments ... 5
7 Preparation of specimens ... 6
8 Test steps ... 6
9 Result calculation and presentation ... 7
10 Evaluation of shape memory properties ... 8
11 Test report ... 8
Textile -- Determination and evaluation for shape memory
1 Scope
This document describes methods for testing and evaluating the shape memory
properties of textiles.
This document applies to force-caused shape memory woven fabrics.
This document does not apply to other types of shape memory fabrics such as
thermotropic shape memory fabrics.
2 Normative references
The following documents are essential to the application of this document. For the dated
documents, only the versions with the dates indicated are applicable to this document;
for the undated documents, only the latest version (including all the amendments) is
applicable to this standard.
GB/T 6529 Textiles -- Standard atmospheres for conditioning and testing
3 Terms and Definitions
The following terms and definitions apply to this document.
3.1 Shape memory property
The property with which the fabric that has a certain original shape, after being
deformed by the external force, can fix its temporary deformation (shaping ability)
under specific conditions and restore its original shape (recovery ability) under external
conditions. According to the different deformation conditions, it can be divided into
force-caused shape memory, thermotropic shape memory, photoinduced shape memory,
and so on.
3.2 Force-caused shape memory property
The property with which the fabric that has a certain original shape, after being
deformed and fixed, can return to the original shape under the action of external force.
6.2 Recovery heavy hammer: (20±0.5) g; the bottom edge of the heavy hammer shall
be round; the diameter shall be (22±2) mm, and the size shall be able to cover all creases.
6.3 Angle measuring device: It is mainly composed of a disc carved with angles and a
sample holder. The cutting edge of the sample holder shall be 2 mm away from the axis
of the dial, and the crease line of the sample can be guaranteed to coincide with the axis
of the dial. The sample holder shall be able to be rotated around the axis of the dial to
keep the free wing of the sample in a vertical position. The graduation value of the dial
of the recovery angle measurer shall be 1°.
6.4 Tweezers: The edges shall be smooth and not hook on the surface of the sample
when gripping.
6.5 Stopwatch: It shall be accurate to 0.1 s.
6.6 Others: The instruments that work on the same principle and meet the technical
conditions of this document can be used.
7 Preparation of specimens
7.1 The specimen shall be representative. The specimen shall be taken at a distance of
more than 150 mm from the edge of the fabric. Avoid wrinkles, holes, and deformation,
and cut the specimen out of a flat fabric.
7.2 The size of the specimen shall be a rectangle of 40 mm × 15 mm. The number of
specimens for each sample shall be at least 10, that is, 5 specimens in the warp and weft
directions of the samples. The length direction of the specimen shall be parallel to the
warp or weft direction of the sample. 10 specimens shall be sampled at different
locations to ensure that each specimen does not contain the same yarn.
7.3 The specimen shall be subjected to humidity conditioning in an environment that
meets the requirements of Chapter 5.
8 Test steps
8.1 Along the length of the sample and with the reverse side facing inward, align the
two ends and fold it; clamp the edge of the sample with tweezers; the clamped position
shall be no more than 5 mm from the edge of the short side of the sample; place the
sample on the testing platform, and apply the shaping heavy hammer (6.1) on the
sample along the edge of the crease; the pressure area shall be 225 mm2.
8.2 After applying pressure for 5 minutes, remove the load, hold the sample with
tweezers, and transfer it to the sample holder of the angle measuring device. This
process shall be completed within 5 s. Do not touch the crease when using the tweezers
(Above excerpt was released on 2022-08-21, modified on 2022-08-21, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/GBT41420-2022