This standard specifies two methods for determining the crease recovery of fabrics using the crease recovery angle, namely the horizontal crease recovery method and the vertical crease recovery method. This standard applies to all kinds of textile fabrics, but not to fabrics that are particularly soft or prone to curling. GB/T 3819-1997 Determination of crease recovery of textile fabrics - Angle of recovery method GB/T3819-1997 Standard download decompression password: www.bzxz.net

BCS59.080.30
National Standard of the People's Republic of China
G/T3819---1997
Textile fabricsDetermination of the recovery frontcreasing of a folded specimen by measuring the angle of Published on June 9, 1997
Implemented on December 1, 1997
Published by the State Administration of Technical Supervision
GB3B19-:1997
This standard is a revision of GB3B19-83 Fabrics-Determination of the recovery of folded test specimens expressed by the angle of recovery. This standard includes the following test methods, among which the crease level recovery method is used. GB3B19-83 Fabrics-Determination of the recovery of folded test specimens expressed by the angle of recovery is revised based on the test equipment and technical records of my country a few months ago. Compared with the original standard, this standard has made the following technical changes: This standard has redefined the definition of the two methods, and stipulates that the recovery angle of the test specimen 5 minutes after the load is removed is used as the test result. From the date of entry into force of this standard, GB3B19-83 is still in effect. Appendix A of this standard is the appendix. This standard was drafted by the Science and Technology Development Department of China National Textile and Apparel Council, and is under the jurisdiction of the Standardization Research Institute of China National Textile and Apparel Council. The original unit of this standard is the National Textile Quality Supervision and Inspection Center. The main drafters of this standard are Ji et al., Wang Minqiu, National Standard of the People's Republic of China. Determination of Crease Recovery of Textiles Determination of Crease Recovery by Angle Method Textlle fabrics Determination of crease recovery of lolded specifications by measuring the angle of recovery 1 Scope CE/T3B19—1997 391-83 The standard specifies two methods for measuring the crease recovery of fabrics by measuring the angle of recovery, namely the horizontal fold recovery method (horizontal method for short) and the vertical fold recovery method (vertical method for short). This standard is applicable to all kinds of woven fabrics, but not to fabrics that are particularly soft or very easy to rub. 2 Referenced standards
The texts contained in the following standards, except for the references in this standard, constitute the provisions of this standard. When this standard is published, the versions shown are valid at the same time. All standards will be revised. The parties using this standard should consider the possibility of using the latest version of the following standards. GB629-86 Standard for the weft and weft of fabrics GB81787 Numerical specification
3 Definitions
This standard adopts the following definitions
3.1 Crease recovery property crcaeIe ... 3.3 Horizontal recovery When the sample is folded and measured, the fold line is perpendicular to the water surface and the angle is measured. 3.4 Horizontal recovery When the sample is folded and measured, the fold line is perpendicular to the water surface and the crease is measured. 4 Specimens of certain shape and size are subjected to a certain time of stress under specified conditions. That is, after the load is removed, the sample is allowed to recover for a certain period of time and then the angle of recovery is measured. The angle of recovery is used to represent the folding recovery capacity of the material. 5 Samples 5.1 Samples shall be collected in accordance with the relevant product standards or relevant agreements, and the sampling method in Appendix A shall be followed. 5.2 Newly processed or post-processed fabrics shall be stored indoors for at least 15 days before sampling. 5.3 The samples must be free of generational changes to ensure that there are no obvious defects in the samples and that the samples do not affect the test results. The number of samples for each group of products should be at least 100, and the consultation and feedback of each customer should be 500. Day test! Scrape the front side of the sample, i.e. 5 in the warp direction and 5 in the knot direction, 6.2 Test recovery angle: 2 cm long, 15 mm wide, horizontal, test size 4 mm × 15 mm. The shape and size of the vertical method test specimen are shown in Figure [. Qiu Xiaqi
Zhe Tongyin
The same responsibility
Figure 1 Vertical method test specimen
Two twists and test size
7.1 The pre-humidification and humidity measurement of the sample are carried out according to the above 6529. The humidity and test are carried out in the third-level standard atmosphere. 7.2 If necessary, measure the recovery angle of the sample in the commercial humidity atmosphere, i.e. the angle of 35 ℃: ±2℃, relative accuracy is 95%6 ±2cm, the sample can be adjusted without adjustment
8 ResistorsbZxz.net
8.1 The basic characteristics of the resistor
8.1.15 The load is JUN.
B.1.2 The area under pressure: 1mm×15mm for horizontal method and 18mm×15mm for vertical method, 8.1.3 The pressure time is 5min5, 8.1.4 The scale value of the short angle measurement is ±1\, B.1.5 The sample table should be properly equipped to ensure that the test object is not affected by ventilation, breathing of the explorer and temporary heat radiation of the lamp. B. 2.2.2 The folding angle measurement device mainly consists of a plate with an angle and a sample clamp. The edge of the sample clamp is 2M away from the center of the plate and can ensure that the sample fold is exactly aligned with the axis of the plate. The sample can be rotated about the axis of the plate so that the sample can freely maintain the vertical position (see Figure 3).
Figure 3 Horizontal angle measurement
B.3 Vertical method also meets the conditions
8.3.1 The load bearing is shown in Figure 4
B.3.2 The center of the transparent pressure plate is the same as the center of the effective pressure area of ​​the sample. B.4 The principle is the best. All parts that meet the technical requirements of this standard can be used. 9 Steps
91 Horizontal tension
9.1.1 Align the two sides of the sample in the length direction, clamp them with a wide mouth, and place them no more than 5mm apart until the sample is correctly positioned on the flat plate marked with 15mm×20mm. Gently press the pressure weight. 9.1.2 After the sample has been under the specified load for the specified time, the load is removed and the actual test piece is transferred to the sample return device. One wing of the sample is quickly suspended, while the other wing is freely hanging. The sample is continuously lubricated and adjusted to maintain the true vertical position.
GH/T3819—1997
9.1.3 The specimen is cut from the center for 5 m after the pressure vessel is cut and read. The focus is then returned to the nearest 1°. If it is slightly rolled or twisted, the vertical plane passing through its center and the axis of the dial shall be used as the basis for the reading of the crease angle. 9.2 Vertical method
9.2.1 Place the solid wing of the specimen against the inner fold line of the specimen so that it coincides with the folding mark of the specimen clamp. Fold the specimen in half along the straight line without applying any pressure at the fold. Then place a transparent pressure plate on the desired specimen and apply the force as shown above (Figure 4). 9.2.2 After the specimen has been subjected to the stress load for a specified time, the pressure plate is quickly removed and the specimen is rotated 90 degrees together with the pressure plate. The transparent pressure plate is removed and the specimen is opened. 9.2.3 When the specimen reaches 5° after the negative pressure is removed, the angle measuring device is used to measure the folding and recovery functions respectively. The reading is closest to 1°. The recovery is true and there is no slight lifting or twisting. The center line of the root is taken as the basis. 9.3 If the specimen has a tendency to stick, place a piece of paper or plastic sheet with a thickness less than 0.02 μm at 2mT1 between the fold lines. After the specimen is lubricated, it is connected to the adhesive sleeve by a slow imaging device during the test. 10 Test results
10.1 Calculate the average value of the following angles respectively, rounding to the decimal point, and retaining the digits according to the GB/T 17 numbering rule. 10.2 Warp direction (front fold):
front fold;
b) back fold
10.3 Weft direction (back fold):
% (front fold);
[) back fold,
104 Total fold recovery angle is the sum of the average values ​​of the warp and weft fold angles. 11 Test report
The test report shall include the following contents: a) Standard number and payment method b) Sample name and specification c) Standard atmosphere used for test d) Test period d) Test value F of sample 3) Average value of the angle of recovery after folding B) Total angle h) If necessary, write down the standard error and 95% required internal deviation. 11 Samples
GB/T 38191997
Appendix A
(Appendix with suggestions) Sampling method Collect the number of pieces specified in Table A1 from a batch of goods, and then cut a 30cm long piece from each piece. The sample should be 3m away from the end of the cloth.
The medical effect of pushing goods
11--30
31~-75
A2 Sampling
Collecting pieces
The distance between the sample and the edge of the cloth is greater than 150mm. Do not sample at the infected, new and deformed parts. A2.2
Sample sampling position on the sample shows the recovery exemption letter A1150r.m
30 station sampling rack position example
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