GB/T 3923.2-2013Textiles -- Tensile properties of fabrics -- Part 2: Determination of maximum force using the grab method (English PDF)

16825.1 and GB/T 19022 were added;

— Add 3.1 and the note of 3.4;

— The provision of laboratory sampling (8.1) was integrated into Chapter 5;

— Test specimen "length shall not less than 150 mm" in 8.2 was changed into

"length shall be long enough to secure the gauge length of 100 mm";

— 8.2 was divided into 8.2 and 8.3; and the location of index line was changed from

"37.5 mm" into 38 mm;

— Add gauge length 75 mm in 9.1;

— Schematic diagram of sample clamping in 9.3 was deleted;

— The requirements of "round the results for values" in 10.1 was modified; and add

"if required" in 10.2 and 10.3.

This Part was redrafted based on ISO 13934-2.1999 "Textiles - Tensile properties of

fabrics - Part 2. Determination of maximum force using the grab method" (English

edition).

The main differences between this Part and ISO 13934-2.1999 are as follows.

— Foreword, introduction and bibliography of the international standard were

deleted;

— Chapter 1 "Scope" was modified;

— The international standards and European Union standards specified in

Normative References are replaced by corresponding national standards of

China;

— The note of 3.4 was modified;

— Subclause of 6.1 was replaced by inclusion of items;

— Chapter 10 was divided into 3 subclauses; add note of 10.1 and equation (1).

This Part was proposed by the China National Textile and Apparel Council.

This Part shall be under the jurisdiction of Subcommittee on Basic Standard the

National Technical Committee 209 on Textiles of Standardization Administration of

China (SAC/TC 209/SC 1).

Drafting organizations of this Part. CTS (Beijing) Textile Testing & Certification Services

and National Textile Quality Supervision Testing Center.

Chief drafting staffs of this Part. Liu Ming, Zheng Yuying, Wang Ying and Li Yafeng.

The previous editions replaced by this Part are as follows.

— GB/T 11050-1989;

— GB/T 3923.2-1998.

Textiles - Tensile Properties of Fabrics - Part 2.

Determination of Maximum Force Using the Grab

Method

6.2 Equipment for cutting test specimens.

6.3 Equipment in which test specimens can be immersed in water preparatory to wet

testing.

6.4 Grade 3 water in accordance with GB/T 6682 for wetting test specimens.

6.5 Non-ionic wetting agent.

8.1 General

From each laboratory sample two sets of test specimens shall be cut, one set in the

warp direction and the other in the weft direction (or in the machine and cross-machine

directions, where applicable).

Each set shall consist of at least five test specimens, except that if a higher degree of

precision is required, more test specimens shall be tested. In accordance with Chapter

8.2 Dimensions

and so that the line drawn on the test specimen coincides with one edge of the jaws.

After closing the upper jaw, avoid pretension when adjusting the specimen along the

guide line in the lower jaw so that the fabric hangs under its own weight when the lower

clamp is closed.

9.4 Operation

Engage any device for recording the maximum force. Put the movable clamp in motion

and extend the test specimen to the point of rupture. Record the maximum force in

newtons (N). Perform the test at least on five test specimens of each fabric direction.

Record any break which occurs within 5 mm of the clamping line of the jaws and report

the result as a jaw break. At the end of the five tests examine the results obtained. If

any of the jaw break results falls above the lowest "normal" break result, then it can be

included. If any of the jaw break results falls below the lowest "normal" break result

then it shall be excluded and further tests carried out to obtained five "normal" breaks.

If all the results are jaw breaks, or if five "normal" breaks can not be obtained then the

individual results shall be reported without the coefficient of variation or confidence

limits. Jaw break results shall be indicated as such in the report.

9.5 Tests on wet test specimens

Perform the test according to 9.1 to 9.4 immediately after removal of a test specimen

from the liquid (see 8.4.2) and briefly placing it on blotting paper to remove excess

water.

10.1 Calculate the arithmetic mean of the maximum force, in newtons (N), for each

direction tested. Round the results for values.

a) < 100 N. to the nearest 1 N;

b) >= 100 N to < 1000 N. to the nearest 10 N;

c) >= 1000 N. to the nearest 100 N.

Note. As required, calculated res...

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