GB/T 3820-1997Determination of thickness of textiles and textile products (English PDF)

3.1 Thickness of a textile

It refers to the vertical distance between the two reference plates that apply the specified pressure to the textiles.

3.2 Bulky textiles

It refers to the textiles with a thickness variation (compression ratio) of greater than or equal to 20% when the pressure applied to the textiles increases from

0.1kPa to 0.5kPa, such as artificial furs, plush, velvet, nonwoven interlinings, etc.

are in accordance with product standards. If they fail to be specified in detail in the product standards, the method agreed by the parties concerned that is of interest to the test results shall apply.

7.2 Test pieces

7.2.1 The samples collected according to Subclause 7.1 can be directly used as the test pieces. During the test, the measuring parts shall be arranged in a ladder evenly in the area above 150mm from the selvedge. The measuring points are not in the same longitudinal and transverse positions, and shall avoid the flaws and wrinkles that affect the test results.

7.2.2 For samples that are susceptible to deformation or may affect the test operations, such as certain knitted fabrics, nonwovens or wide fabrics and textile products, etc., a sufficient number of test pieces shall be cut in accordance with Table 1. The requirements for sample cutting shall be in accordance with Subclause 7.2.1. The dimensions of the test pieces shall not be less than the presser foot dimensions.

7.3 Conditioning

Before the test, the samples or test pieces shall realize conditioning equilibrium in a relaxed state in the atmosphere specified in Chapter 6. The conditioning method and requirements shall be in accordance with GB 6529. It is generally necessary to perform conditioning for more than 16h. Synthetic fiber samples shall be equilibrated for at least 2h. The samples with a conventional moisture regain of zero can be determined directly.

8.2 CLEAN the presser foot (5.1.1) and reference plate (5.1.2) to check the

movement flexibility of the presser foot shaft. SET the pressure according to

Table 1. Then DRIVE the presser foot against the reference plate, and SET the thickness meter (5.1.4) to zero.

8.3 RAISE the presser foot to place the test piece without tension and

deformation on a reference plate.

8.4 PRESS the presser foot gently on the test piece, and MAINTAIN a

Chinese Standards

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Translated by: Field Test Asia Pte. Ltd. (Incorporated & taxed in Singapore. Tax ID: 201302277C)

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