This standard specifies five methods for determining the mass of woven fabrics. This standard applies to full-width or folded woven fabrics (including elastic fabrics). GB/T 4669-1995 Determination of mass per unit length and mass per unit area of ​​woven fabrics GB/T4669-1995 Standard download decompression password: www.bzxz.net

ICS_59.080.30
National Standard of the People's Republic of China
GB/T4669--1995
Textiles---Woven fabrics-Determination of mass per unit length and mass per unit area
Textiles---Woven fabrics-Determination of mass per unit length and mass per unit area
Promulgated on December 8, 1995
State Bureau of Technical Supervision
Implementation on May 1, 1996
National Standard of the People's Republic of China
Determination of mass per unit length and mass per unit area
Textiles-Woven fabricsDetermination of mass per unit length and mass per unit areaThis standard is equivalent to the international standard ISO3801-1977 "Textiles-1 Subject content and scope of application
This standard specifies 5 methods for determining the mass of woven fabrics. This standard applies to full-width or folded woven fabrics (including elastic fabrics). 2 Reference standards
GB/T4666 Determination of the length of woven fabrics
Determination of the width of woven fabrics
GB/T4667
GB6529 Rules for rounding off values ​​of standard atmospheres for conditioning and testing of textiles
GB8170
3 Definitions
GB/T4669—1995
Replaces GB4669--84
Measurement of the mass per unit length and mass per unit area of ​​woven fabrics The mass per unit length and mass per unit area of ​​woven fabrics refers to the unit mass of fabrics including the water content and non-fiber materials contained in the fabric per unit length or per unit area. 4 Principle
4.1 The entire length of fabric can be conditioned in a standard atmosphere. After conditioning, the length (width) and mass of the fabric are measured, and the mass per unit length (area) of the fabric is calculated.
4.2 If the entire fabric cannot be humidified in the standard atmosphere, first measure the mass per unit length (area) of the fabric in the normal atmosphere, and then use the correction factor to correct it. The correction factor is obtained by cutting a part of the relaxed fabric, first measuring it in the normal atmosphere, then humidifying and measuring it in the standard atmosphere, comparing the length (width) and mass of this part, and then calculating it. 4.3 For the small sample test, first humidify the small sample in the standard atmosphere, then cut a sample from the small sample according to the specified size and weigh it, and calculate the mass per unit area.
5 Instruments and tools
5.1 Steel ruler. The graduation value is millimeters, and the length is at least 1.5m. 5.2 Scissors.
5.3 Weighing instrument
The accuracy of the weighing instrument is ±0.2% of the mass of the sample to be measured; a.
Approved by the State Administration of Technical Supervision on December 8, 1995 and implemented on May 1, 1996
CB/T4669-1995
b. The balance is used for small sample testing, with an accuracy of 0.001g. 5.4 Measuring table.
5.5 Cutter
The cutter used for small sample testing should be able to cut a sample of 10cm×10cm or a circular sample with an area of ​​100cm. The accuracy is 1%.
6 Atmosphere for humidity adjustment and testing
The atmosphere for humidity adjustment and testing shall adopt the standard atmosphere specified in GB6529, and the secondary standard atmosphere shall be used for arbitration tests. The pre-humidified standard atmosphere shall be in accordance with the provisions of GB6529. 7 Steps
7.1 Pre-humidification
For fabric samples with high regain and unable to be subjected to moisture balance, pre-humidification shall be carried out according to the provisions of GB6529. 7.2 Edge Removal
If the mass of the fabric edge is significantly different from that of the fabric body, the sample after removing the fabric edge shall be used to determine the mass per unit area.
7.3 The whole piece of fabric can be humidified in standard atmosphere7.3.1 Method 1 Determination of mass per unit length7.3.1.1 Place the fabric in standard atmosphere for humidification, measure the length according to GB/T4666; weigh. 7.3.1.2 If the full length of a long piece of fabric cannot be measured, a whole piece of sample can be cut from the fabric along a parallel line at right angles to the fabric edge for measurement. The length of the sample should be 3~4m and at least 0.5m. Measure the length of the sample after humidification according to GB/T4666 and weigh it in standard atmosphere. 7.3.2 Method 2 Determination of mass per unit area 7.3.2.1 Use the method in 7.3.1.1 and determine the width after moisture conditioning according to GB/T4667. 7.3.2.2 If the full length of a long piece of fabric cannot be measured, the method in 7.3.1.2 may be used and the width after moisture conditioning may be determined according to GB/T4667.
7.4 The entire length of the fabric cannot be mixed in a standard atmosphere 7.4.1 Method 3: Determination of mass per unit length After the entire length of the fabric is relaxed in a normal atmosphere, the entire length is measured according to GB/T4666 and weighed. Then cut a whole sample from the entire length of the fabric, preferably 3~4m in length and at least 1m in length, and measure the length and weight of the sample in a normal atmosphere at the same time. Then, measure the length of the sample after moisture conditioning according to the method in 7.3.1.2 and weigh it. The measurement accuracy is the same as that specified in 7.3.1.1.
7.4.2 Method 4: Determination of mass per unit area The determination is carried out in accordance with the provisions of Method 3, and the width of the sample in normal atmosphere and after humidification is determined in accordance with GB/T4667. 7.5 Determination of mass per unit area of ​​small samples
7.5.1 Sample preparation
Cut 5 representative samples (or other specified numbers) from the wrinkle-free part of the fabric, each of which is about 15cm×15cm. If the local area mass of the fabric is affected by a large pattern, the sample should contain an integer of the complete organization of this pattern. 7.5.2 Determination procedure
7.5.2.1 Place the sample in standard atmosphere for humidification for at least 24 hours as required (or pre-humidify it according to actual conditions). 7.5.2.2 Use a cutter to cut a 10cm×10cm square sample or a circular sample with an area of ​​100cm from the sample. 7.5.2.3 Weigh the sample to an accuracy of 0.001g. 8 Calculation of results
8.1 For methods 1 and 2.
GB/T4669-1995
8.1.1 Calculate the mass per unit length and mass per unit area according to formula (1) and formula (2): m
Where: mu - the mass per unit length of the whole fabric or sample after moistening, g/m; mu - the mass per unit area of ​​the whole fabric or sample after moistening, g/m; m - the mass of the whole fabric or sample after moistening, gL. The length of the whole fabric or sample after moistening, m; W - the width of the whole fabric or sample after moistening, m. 8.1.2 Calculate to the nearest 0.1g, and then round off to 1g according to the provisions of GB8170. 8.2 For methods 3 and 4
8.2.1 Calculate the mass of the fabric after moistening according to formula (3). me= m, × mc
Where: m.
Mass of the whole fabric after humidification, g;
Mass of the whole fabric in normal atmosphere, g; Mass of the sample after humidification, g;
Mass of the sample in normal atmosphere·&
8.2.2 Use the value calculated by formula (3) to calculate the mass per unit length or mass per unit area according to the method in 8.1. 8.2.3 Calculate to 0.1g and then round to 1g according to the provisions of GB8170. 8.3 For small sample test
8.3.1 Calculate the mass per unit area of ​​fabric from the mass of the sample according to formula (4). mua=m×100
Where: mu--mass per unit area of ​​fabric after humidification, g/m\; m mass of sample, g.
8.3.2 Calculate the average of the five numbers obtained above, accurate to 0.01g, and then round off to 0.1g in accordance with the provisions of GB8170. 9 Test report
The test report should include the following:
State that the test is carried out in accordance with this standard; the name and specifications of the test specimen;
Test date;
The mass per unit length or mass per unit area of ​​the fabric; the determination method and whether the result includes the selvedge; any details of deviation from this standard.
(1)
(3)
(4)
A1 Scope of application
GB/T4669--1995
Appendix A
Conventional determination methods
(Supplement)
The methods specified in this appendix are generally used for routine tests for internal quality control, etc. A2 Determination method
The method for determining the dry mass of fabric (including non-fiber materials) is adopted. A2.1 It can be carried out in normal atmosphere.
A2.2 Method A: Determination of unit area mass of the whole sample A2.2.1 Cut a full-width sample of about 0.5m in length from the sample fabric, cut off about 2cm of width on both sides of the sample, and trim it evenly. Lay it flat on the measuring table, measure the length and width (accurate to 0.1cm) in the middle and on both sides (10cm away from the edge of the fabric), and calculate the average value. Then weigh the sample to an accuracy of 0.01g. A2.2.2 Cut a full-width fabric strip of about 10cm in length from the sample and measure the moisture regain. A2.2.3 Calculation of results
Calculate the dry mass of the fabric (including non-fiber substances) according to formula (A1). m×10000
mu=LXBX(1+W）
Wherein: mue
fabric dry mass (including non-fiber materials), g/m; sample mass·g;wwW.bzxz.Net
sample length, cm;
B—sample width, cm;
W----sample moisture regain, %.
Calculate to the accuracy of 0.01. Then round off to 0.1 according to the provisions of GB8170. A2.3 Method B: Determination of unit area mass of small samples (A1)
A2.3.1 Cut 5 representative 10cm×10cm square samples or 100cm2 round samples from the sample and weigh them to the accuracy of 0.01g.
A2.3.2 Dry the sample for ten minutes and weigh it to the accuracy of 0.01g. A2.3.3 Calculation of results
Calculate the dry mass of fabric (including non-fiber materials) according to formula (A2) m.=mX100
Wherein: mua dry mass of fabric (including non-fiber materials).g/m; m-
-mass of sample, g.
Calculate to 0.01, and then round to 0.1 according to GB8170. (A2)
Additional notes:
GB/T4669-1995
This standard was proposed by China National Textile and Apparel Council and is under the jurisdiction of the Standardization Research Institute of China National Textile and Apparel Council. This standard was drafted by Shanghai Textile Standard and Metrology Research Institute. The main drafter of this standard is He Jieren.
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