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GB/T 14342-2015 English PDF (GBT14342-2015)

GB/T 14342-2015 English PDF (GBT14342-2015)

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GB/T 14342-2015: Man-made fiber -- Test method for specific resistance of staple fibers

This Standard specifies the test methods for specific resistance of staple fibers of man-made fibers. This Standard is applicable to the staple fibers of man-made fibers.
GB/T 14342-2015
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 59.060.20
W 50
Replacing GB/T 14342-1993
Man-Made Fiber ?€? Test Method for
Specific Resistance of Staple Fibers
ISSUED ON. SEPTEMBER 11, 2015
IMPLEMENTED ON. APRIL 1, 2016
Issued by. General Administration of Quality Supervision, Inspection and Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 Terms and Definitions ... 5
4 Principles ... 6
5 Apparatus ... 6
6 Standard Atmosphere for Pre-humidifying, Humidifying and Test... 6
7 Specimen and Preparation ... 7
8 Test Procedures ... 8
9 Result Calculation ... 8
10 Test Report ... 9
Appendix A (Normative) Test Method of Specific Resistance ?€? Bridge Method ... 10
Foreword
This Standard was drafted as per the rules specified in GB/T 1.1-2009.
This Standard replaced GB/T 14342-1993 Testing Method for Specific Resistance of Synthetic Staple Fibers.
The major differences between this Standard and GB/T 14342-1993 are as follows. --- Modify the standard name;
--- Modify the standard applicable scope (see Clause 1 of this Edition; Clause 1 of 1993 Edition);
--- Modify the specific resistance terminology (see Sub-clause 3.1 of this Edition; Clause 3 of 1993 Edition);
--- Modify the technical requirements of specific resistance meter of fiber (see Sub- clause 5.1 of this Edition; Sub-clause 5.1 of 1993 Edition);
--- Modify the atmospheric requirements for humidifying and test (see Clause 6 of this Edition; Clause 6 of 1993 Edition);
--- Modify the judging mode of humidifying balancing (see Sub-clause 6.2.3; Sub- clause 7.2 of 1993 Edition);
--- Modify the clause contents on specimen and preparation (see Clause 7 of this Edition; Clause 7 of 1993 Edition);
--- Modify the clause contents on test procedures (see Clause 8 of this Edition; Clause 8 of 1993 Edition);
--- Add the formula to calculate the standard degree of filling for fiber (see Clause 9 of this Edition);
--- Increase the clause on test report (see Clause 10 of this Edition); --- Increase one test method (see Appendix A).
This Standard was proposed and under the jurisdiction of China National Textiles and Apparel Council.
Drafting organizations of this Standard. Shanghai Textile Industry Institute of Technical Supervision, Yantai Yayho Advanced Materials Co., Ltd., Jiangsu Sanfangxiang Group Co., Ltd., Sinopec Yizheng Chemical Fiber Co., Ltd., and Sinopec Shanghai Petrochemical Co., Ltd.
Man-Made Fiber ?€? Test Method for
Specific Resistance of Staple Fibers
1 Scope
This Standard specifies the test methods for specific resistance of staple fibers of man- made fibers.
This Standard is applicable to the staple fibers of man-made fibers.
2 Normative References
The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this document.
GB/T 3291.1 Textiles - Terms of Textile Material Properties and Test - Part 1. Fiber and Yarn
GB/T 3291.3 Textiles - Terms of Textile Material Properties and Test - Part 3. General
GB/T 4146.1 Textiles ?€? Man-Made Fibers ?€? Part 1. Generic Names
GB/T 4146.3 Textiles ?€? Man-Made Fibers ?€? Part 3. Terms of Inspection
GB/T 8170 Rules of Rounding off for Numerical Values and Expression and
Judgement of Limiting Values
GB 9994 The Convention Moisture Regains of Textiles
3 Terms and Definitions
The following terms and definitions and those ones stipulated in GB/T 3291.1, GB/T 3291.3, GB/T 4146.1 and GB/T 4146.3 are applicable to this document.
3.1 Specific resistance
Fibers, in certain volume, is converted into volume resistance according to the fiber 7.2 Take two pieces of 15g of fibers (accurate to 0.1g) from the sample through humidifying balance, which shall be regarded as the test sample.
8 Test Procedures
8.1 Start the specific resistance meter of fiber, pre-heating and adjusting to the normal working states.
8.2 Clean the internal test box with anhydrous ethanol, then cover the box. Connect the test electrodes of resistance meter to the two electrodes of test box; and exert 100V voltage; after measuring the insulation resistance no less than 1014??? or no less than 10 times of the expected fiber resistance, it can be used for backup. 8.3 Disconnect the voltage on two electrodes of the test box; connect the two electrodes which shall also be grounding, so that the electrostatic is discharged on the electrode plates.
8.4 Use tweezers to fill the fiber evenly into the test box, cover it, so that the fiber is within 6cm??4cm??2cm space.
8.5 Connect the test electrodes of resistance meter to the two electrodes of the test box.
8.6 Exert the test voltage to the two electrodes of the test box; take the readings for resistance meter after energizing for 1min as the resistance value of the tested fiber. 8.7 Repeat the procedure of 8.3.
8.8 Take out the fiber from the test box, repeat the procedures 8.4~8.7 to measure the other fiber.
NOTE. when the measuring range is 106???~1014???, the test voltage is 100V. In order to improve the readings accuracy of the instrument with pointer indication, 50V is optical; but it shall be indicated in the report.
8.9 The resistance value 102???~107??? of staple fiber of man-made fibers can also be performed as per the provisions of Appendix A.
9 Result Calculation
9.1 The specific resistance of fiber shall be calculated as per Formula (1). Where.
Appendix A
(Normative)
Test Method of Specific Resistance ?€? Bridge Method
A.1 Scope
This Appendix specifies the test method of specific resistance ?€? bridge method of staple fiber of man-made fibers.
This Appendix is applicable to the staple fiber of man-made fibers with specific resistance of 102???~107???.
A.2 Principle
The two equivalent resistances form a branch circuit in series; the other branch circuit shall be formed by connecting the resistance box and test box in series. After the two branch circuits are connected in parallel, connect to the DC. Make the potential difference between the element series points of two branch circuits be zero through changing the value of resistance box. Then convert into the special resistance value according to the degree of filling for fiber.
A.3 Apparatus
A.3.1 DC power. 2V??0.06V; the output current is changing from zero to 10mA; the output voltage change is less than 1%.
A.3.2 Resistance box. 102???~107???; step value 1???; accuracy 1%; power 0.25W. A.3.3 Resistance. 100k???; accuracy 1%; power 0.25W.
A.3.4 Voltmeter. measuring range exceeds ??10mV, no greater than ??200mV; accuracy 1%.
A.3.5 Pushbutton switch.
A.3.6 Test box. a rectangular box with a lid for placing the fiber to be measured. The two sides on internal wall of box are two electrode plates; the electrode plates are 6cm- long and 4cm-wide, and the two plates are at interval of 2cm. The insulation resistance between the two electrodes is no less than 109???. The metal with outer housing grounding shall shield the test box.
A.3.7 Balance. scale 0.01g.
A.3.8 Tweezers, etc.

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