GB/T 7742.1-2005 English PDF (GB/T7742.1-2005)

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GB/T 7742.1-2005: Textiles -- Bursting properties of fabrics -- Part 1: Hydraulic method for determination of bursting strength and bursting distension
GB/T 7742.1-2005
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
lCS 59.080.30
W 04
Replacing GB/T 7742-1987
Textiles - Bursting Properties of Fabrics - Part 1.
Hydraulic Method for Determination of Bursting
Strength and Bursting Distension
(ISO 13938-1.1999, MOD)
ISSUED ON. NOVEMBER 4, 2005
IMPLEMENTED ON. MAY 1, 2006
Issued by. General Administration for Quality Supervision, Inspection
and Quarantine (AQSIQ);
Standardization Administration (SAC) of the People’s
Republic of China.
Table of Contents
1 Scope ... 5 
2 Normative References ... 5 
3 Terms and Definitions ... 6 
4 Principle ... 7 
5 Test Specimens ... 7 
6 Apparatus ... 7 
7 Conditioning ... 8 
8 Procedure ... 8 
9 Calculation and Expression of Results ... 9 
10 Test Report ... 10 
Appendix A (Informative) Selection of Test Areas ... 12 
Foreword
GB/T 7742 "Textiles - Bursting Properties of Fabrics" includes the following two parts.
— Part 1. Hydraulic Method for Determination of Bursting Strength and Bursting
Distension;
— Part 2. Pneumatic Sealing Method for Determination of Bursting Strength and
Bursting Distension.
This Part is Part 1 of GB/T 7742; it is modified in relation to ISO 13938-1.1999
"Textiles - Bursting Properties of Fabrics - Part 1. Hydraulic Method for Determination
of Bursting Strength and Bursting Distension".
This part is redrafted according to ISO 13938-1.1999; its differences with ISO
13938-1.1999 are as follows.
— The quoted GB 6529 "Textiles - Standard Atmospheres for Conditioning and
Testing" in normative reference of this Part is established by reference to ISO
139 "Textiles - Standard Atmospheres for Conditioning and Testing"; the quoted
GB/T 19022 is identical to ISO 10012.2003 and thereby replaces the normative
reference ISO 10012-1.1992 in ISO standard;
— 6.1.1~6.1.8 of ISO are adjusted as 6.1~6.8 according to the requirements of
5.2.3 "Articles may be set only when there are two or above articles in the same
level".
This Part replaces GB/T 7742-1987 "Textiles - Determination of Bursting Strength and
Bursting Distension - Diaphragm Method".
This Part has made the following technical modifications to GB/T 7742-1987.
— The standard name is changed to "Textiles - Bursting Properties of Fabrics -
Part 1. Hydraulic Method for Determination of Bursting Strength and Bursting
Distension"; a comparison description of using two kinds of apparatus is added
in the Scope.
— 5 terms. test area, bursting pressure, diaphragm pressure, bursting height and
bursting volume and their definitions are added; the definition of bursting
distention is modified.
— Requirements for apparatus accuracy are added and modified. The bursting
pressure is adjusted to ±2% of full scale from ±1%; the bursting height is
adjusted to ±1mm from ±0.25mm. Bursting volume accuracy does not exceed
±2% is added; the volume increase rate accuracy is ±10%.
Textiles - Bursting Properties of Fabrics - Part 1.
Hydraulic Method for Determination of Bursting
Strength and Bursting Distension
1 Scope
This part of GB/T 7742 specifies the hydraulic method of determining textile bursting
strength and bursting distension, including two kinds of procedures of determining test
specimen bursting property. conditioning and soaking.
This Part uses constant rate pump device to apply hydraulic pressure. Pneumatic
sealing method is specified in Part 2 of GB/T 7742.
This Part is applicable to knitted fabric, woven fabrics, nonwovens, laminated fabric
and various textiles manufactured from other process.
The available data indicate. when the pressure does not exceed 80kPa, the bursting
strength results obtained by adopting hydraulic and pneumatic sealing bursting
apparatus have no obvious difference. This pressure range includes most of the
property levels of ordinary garments. For special textiles with higher requirements for
bursting pressure, hydraulic apparatus is more applicable.
2 Normative References
The following standards contain the provisions which, through reference of this Part of
GB/T 7742, constitute the provisions of this Part. For dated reference, the subsequent
amendments (excluding correction) or revisions of these publications do not apply.
However, the parties who enter into an agreement according to this Part are
encouraged to study whether the latest editions of these documents are applicable.
For undated references, the latest edition of the reference document is applicable to
this Part.
GB 6529 Textiles - Standard Atmospheres for Conditioning and Testing
GB/T 6682 Water for Analytical Laboratory Use-Specification and Test Methods
(GB/T 6682-1992, neq ISO 3696.1987)
GB/T 19022 Measurement Management Systems - Requirements for Measurement
Processes and Measuring Equipment (GB/T 19022-2003, ISO 10012.2003, IDT)
Liquid volume required for reaching bursting pressure.
3.8
Time to burst
Time required for distending to test specimen breakage.
4 Principle
Clamp the test specimen to extendible diaphragm; apply liquid pressure under the
diaphragm and make the diaphragm and test specimen distend. Increase the liquid
volume at constant speed till the test specimen breaks; measure the bursting strength
and bursting distension.
5 Test Specimens
Sampling shall be carried out according to product standard requirements or the
agreement signed by parties concerned. If there are no requirements in product
standard serving as examples, an appropriate method of selecting test area shall be
given in Appendix A. The test area shall avoid wrinkles, selvage or area which is
unable to represent textiles. Generally, the clamping system used may be subjected
to test without cutting the specimen.
6 Apparatus
Measurement confirmation of bursting apparatus shall comply with GB/T 19022.
Bursting apparatus shall meet the following requirements.
6.1 Apparatus shall be possessed of constant volume increase rate in the range of
100cm3/min~500cm3/min; the accuracy is ±10%. If the apparatus is not equipped with
a device adjusting liquid volume, time to burst 20s±5s may be adopted; such situation
shall be indicated in the test report.
6.2 When the bursting pressure is larger than 20% of the full scale, its accuracy is
±2% of the full scale.
6.3 When the bursting height is less than 70mm, its accuracy is ±1mm. At the
beginning of the test, the zero point of measurement separation shall be capable of
being adjusted in order to adapt to test specimen thickness.
6.4 If the bursting volume may be displayed, its accuracy shall not exceed ±2% of
the indicating value.
Note 1. For most textiles, especially knitted fabrics, test area 50cm2 is applicable. For fabrics possessed of low
extensibility (according to experience or trial test), such as industry use textiles, the recommended test area is at least
100cm2. When conditions are not met or unsuitable, if both sides agree, test area in 6.5 may be used.
Note 2. Comparison test shall be performed with the same test areas and the same rate of volume increase.
8.3 Set a constant rate of increase in volume of between 100cm3/min and
500cm3/min. Or adjust a time to distend a test specimen to burst of (20±5)s using
preliminary trials.
8.4 Place the test specimen over the diaphragm so that it lies in a flat tensionless
condition, avoiding distortion in its own plane. Clamp it securely in the clamping ring,
avoiding damage, to prevent slippage during the test. Place the distension recording
device into the measuring position and adjust it to the zero position. Fasten the safety
cover in position according to machine requirements. Apply pressure to the test
specimen until the fabric bursts.
Immediately after burst, reverse the apparatus to starting position. Note bursting
pressure and height at burst and/or bursting volume. If the test specimen bursts close
to the edge of the clamping device, report this fact.
Repeat the test at least four more times at different places on the fabric. The number
of test specimens may be increased if agreed mutually.
8.5 Determination of diaphragm pressure
With the same test area and rate of increase in volume or time to burst as that
employed in the above tests, distend the diaphragm without the presence of a test
specimen by an amount equal to the mean height at burst or the mean volume at
burst of the test specimen. Note the pressure at this distension of the diaphragm as
the "diaphragm pressure".
8.6 Wet test
For tests in the wet condition, immerse the test specimen for a period of 1h in Grade 3
water in accordance with GB/T 6682 at a temperature of (20±2)°C. For tropical
regions, temperature according to GB 6529 may be used. An aqueous solution
containing not more than 1g of a nonionic wetting agent per litre may be used instead
of Grade 3 water.
Immediately after removal of a test specimen from the liquid and briefly placing it on
blotting paper to remove excess water, perform the test according to 8.2 to 8.5.
9 Calculation and Expression of Results
c) Mean volume at burst (if required);
d) The coefficient of variation of the relevant values (if required);
e) Relevant confidence interval (if required).
GB/T 7742.1-2005
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
lCS 59.080.30
W 04
Replacing GB/T 7742-1987
Textiles - Bursting Properties of Fabrics - Part 1.
Hydraulic Method for Determination of Bursting
Strength and Bursting Distension
(ISO 13938-1.1999, MOD)
ISSUED ON. NOVEMBER 4, 2005
IMPLEMENTED ON. MAY 1, 2006
Issued by. General Administration for Quality Supervision, Inspection
and Quarantine (AQSIQ);
Standardization Administration (SAC) of the People’s
Republic of China.
Table of Contents
1 Scope ... 5 
2 Normative References ... 5 
3 Terms and Definitions ... 6 
4 Principle ... 7 
5 Test Specimens ... 7 
6 Apparatus ... 7 
7 Conditioning ... 8 
8 Procedure ... 8 
9 Calculation and Expression of Results ... 9 
10 Test Report ... 10 
Appendix A (Informative) Selection of Test Areas ... 12 
Foreword
GB/T 7742 "Textiles - Bursting Properties of Fabrics" includes the following two parts.
— Part 1. Hydraulic Method for Determination of Bursting Strength and Bursting
Distension;
— Part 2. Pneumatic Sealing Method for Determination of Bursting Strength and
Bursting Distension.
This Part is Part 1 of GB/T 7742; it is modified in relation to ISO 13938-1.1999
"Textiles - Bursting Properties of Fabrics - Part 1. Hydraulic Method for Determination
of Bursting Strength and Bursting Distension".
This part is redrafted according to ISO 13938-1.1999; its differences with ISO
13938-1.1999 are as follows.
— The quoted GB 6529 "Textiles - Standard Atmospheres for Conditioning and
Testing" in normative reference of this Part is established by reference to ISO
139 "Textiles - Standard Atmospheres for Conditioning and Testing"; the quoted
GB/T 19022 is identical to ISO 10012.2003 and thereby replaces the normative
reference ISO 10012-1.1992 in ISO standard;
— 6.1.1~6.1.8 of ISO are adjusted as 6.1~6.8 according to the requirements of
5.2.3 "Articles may be set only when there are two or above articles in the same
level".
This Part replaces GB/T 7742-1987 "Textiles - Determination of Bursting Strength and
Bursting Distension - Diaphragm Method".
This Part has made the following technical modifications to GB/T 7742-1987.
— The standard name is changed to "Textiles - Bursting Properties of Fabrics -
Part 1. Hydraulic Method for Determination of Bursting Strength and Bursting
Distension"; a comparison description of using two kinds of apparatus is added
in the Scope.
— 5 terms. test area, bursting pressure, diaphragm pressure, bursting height and
bursting volume and their definitions are added; the definition of bursting
distention is modified.
— Requirements for apparatus accuracy are added and modified. The bursting
pressure is adjusted to ±2% of full scale from ±1%; the bursting height is
adjusted to ±1mm from ±0.25mm. Bursting volume accuracy does not exceed
±2% is added; the volume increase rate accuracy is ±10%.
Textiles - Bursting Properties of Fabrics - Part 1.
Hydraulic Method for Determination of Bursting
Strength and Bursting Distension
1 Scope
This part of GB/T 7742 specifies the hydraulic method of determining textile bursting
strength and bursting distension, including two kinds of procedures of determining test
specimen bursting property. conditioning and soaking.
This Part uses constant rate pump device to apply hydraulic pressure. Pneumatic
sealing method is specified in Part 2 of GB/T 7742.
This Part is applicable to knitted fabric, woven fabrics, nonwovens, laminated fabric
and various textiles manufactured from other process.
The available data indicate. when the pressure does not exceed 80kPa, the bursting
strength results obtained by adopting hydraulic and pneumatic sealing bursting
apparatus have no obvious difference. This pressure range includes most of the
property levels of ordinary garments. For special textiles with higher requirements for
bursting pressure, hydraulic apparatus is more applicable.
2 Normative References
The following standards contain the provisions which, through reference of this Part of
GB/T 7742, constitute the provisions of this Part. For dated reference, the subsequent
amendments (excluding correction) or revisions of these publications do not apply.
However, the parties who enter into an agreement according to this Part are
encouraged to study whether the latest editions of these documents are applicable.
For undated references, the latest edition of the reference document is applicable to
this Part.
GB 6529 Textiles - Standard Atmospheres for Conditioning and Testing
GB/T 6682 Water for Analytical Laboratory Use-Specification and Test Methods
(GB/T 6682-1992, neq ISO 3696.1987)
GB/T 19022 Measurement Management Systems - Requirements for Measurement
Processes and Measu...