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GB/T 7742.2-2015 English PDF (GBT7742.2-2015)

GB/T 7742.2-2015 English PDF (GBT7742.2-2015)

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GB/T 7742.2-2015: Textiles -- Bursting properties of fabrics -- Part 2: Pneumatic method for determination of bursting strength and bursting distension

This Part of GB/T 7742 specified pneumatic method for determination of bursting strength and bursting distension, including programs of bursting property determination by humidifying and wetting sample.
GB/T 7742.2-2015
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 59.080.30
W 04
Textiles - Bursting properties of fabrics - Part 2.
Pneumatic method for determination of bursting
strength and bursting distension
(ISO 13938-2.1999, MOD)
ISSUED ON. SEPTEMBER 11, 2015
IMPLEMENTED ON. APRIL 1, 2016
Issued by. General Administration of Quality Supervision, Inspection and Quarantine;
Standardization Administration Committee.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Definitions ... 5
4 Principle... 5
5 Sampling ... 6
6 Apparatus ... 6
7 Atmosphere used for humidification and test... 7
8 Test procedures ... 7
9 Results calculation and presentation ... 8
10 Test report ... 8
Appendix A ... 10
Foreword
GB/T 7742 ?€?Textiles - Bursting properties of fabrics?€? consists of the following 2 parts.
- Part 1. Hydraulic method for determination of bursting strength and bursting distension;
- Part 2. Pneumatic method for determination of bursting strength and
bursting distension
This Part is the second part of GB/T 7742.
This Part was drafted in accordance with the rules given in GB/T 1.1-2009. This Part uses redrafting method to modify and adopt ISO 13938-2.1999
?€?Textiles. Bursting properties of fabrics. Pneumatic method for determination of bursting strength and bursting distension?€? (English version). Compared with ISO 13938-1.1999, the main differences are as follows.
- International standards in normative references were replaced by
corresponding national standards;
- 6.1 and its subordinate terms of the International standard were modified as 6.1 ~ 6.8;
- 10.1 and 10.2 of the International standard were modified as 10.2 and 10.3; added ?€?the plane that is in contact with diaphragm?€? in 10.2 g).
This Part was proposed by China National Textile and Apparel Council.
This Part shall be under the jurisdiction of National Technical Committee for Textile Standardization (SAC/TC 209).
The drafting organizations of this Part. Wenzhou Darong Textile Instrument Co., Ltd., Textile Industry Standardization Institute, Wenzhou Fangyuan Instrument Co., Ltd., and China Textile Standard (Beijing) Test and Certification Center Co., Ltd.
Main drafters of this Part. Zhang Mengsheng, Zhang Hui, Xu Lu, Zheng Yuying and Zhu Kechuan.
Textiles - Bursting properties of fabrics - Part 2.
Pneumatic method for determination of bursting
strength and bursting distension
1 Scope
This Part of GB/T 7742 specified pneumatic method for determination of
bursting strength and bursting distension, including programs of bursting property determination by humidifying and wetting sample.
Note. Pneumatic method is specified in Part 1 of GB/T 7742.
This Part is applicable to knitted fabric, woven fabric, nonwoven fabric and laminated fabric, as well as a variety of fabrics manufactured by other processes.
Available data suggest that there are no significant differences between results of bursting strength obtained by hydraulic and pneumatic bursting instruments when pressure does not exceed 800kPa. This pressure range includes the
performance level of most common clothing. Hydraulic method is more
applicable for special textile products that require greater bursting pressure. 2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 6529 Textiles - Standard atmospheres for conditioning and testing
GB/T 6682 Water for analytical laboratory use - Specification and test
methods
GB/T 19022 Measurement management systems - Requirements for
measurement processes and measuring equipment
5 Sampling
Sampling shall be in accordance with provisions of product standard or
agreement of related parties. If there is no provision in product standard, as an example, a suitable method of selecting sampling part is offered in Appendix A. Sampling shall not be conducted at the folded part, the wrinkled part, selvage or the part which cannot represent fabric. In general, the holding system can be used for test without cutting sample.
6 Apparatus
6.1 Confirmation of bursting instrument measurement shall be conducted
according to GB/T 19022.
6.2 The instrument shall be able to increase gas pressure to obtain (20??5)s time to burst. In order to adjust gas flow rate based on the time to burst, it shall also require an indication control valve besides the main gas control valve. 6.3 When bursting pressure is greater than 20% of full range, its accuracy shall be ??2% of full range.
6.4 When height at burst is less than 70 mm, its accuracy shall be ??1 mm. At the beginning of the test, the measuring gauge zero shall be adjusted, so as to suit sample thickness.
6.5 Test area shall be 50 cm2 (diameter is 79.8 mm).
If the preferred test area is not applicable on existing equipment, or because fabric has a larger or a smaller stretch properties, or there are other requirements of multi-party agreement, it shall also use 100 cm2 (diameter is 112.8 mm), 10 cm2 (diameter is 35.7 mm), 7.3 cm2 (diameter is 30.5 mm) or other test area.
6.6 Holding device shall be able to firmly hold sample, so as to prevent sample from damage, deformation or slipping during the test. Holder ring shall make high elongation fabric (its height at burst is greater than half of sample diameter) dome unhindered. Make inner diameter of sample holder ring to ??0.2 mm, so as to keep sample from damage. Recommend that holder ring and inner
diameter edge in contact with sample looks round.
6.7 During the test, the safety cover shall be able to surround the clamping device, and the extension of sample shall be clearly observed in the test. 6.8 Diaphragm shall comply with the following requirements.
discarded test number;
f) Observation of bursting properties (e.g., one or two yarn directional damage);
g) Sample state (humidification or wet state), and the plane that is in contact with diaphragm;
h) Any deviation from this Part.
10.3 Test results contain.
a) Average bursting strength, in kPa;
b) Average height at burst, in millimeter;
c) Related coefficient of variation, in percentage, if necessary;
d) 95% of confidence Interval, if necessary.

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