1 Scope
This part of GB/T 13772 specifies applying fixed load method to determine the slippage resistance of yarns at a seam in woven fabrics.
This method is applicable to all woven fabrics for clothing and decoration and elastic woven fabrics (including fabrics with elastic yarns) and is not applicable to fabrics for industry (like fabric tape).
2 Normative References
The clauses in the following documents, through reference to this part of GB/T 13772, constitute provisions of this part. For dated references, all subsequent modification or revision (excluding correction contents) are not applicable to this Part. However, all concerned Parties are encouraged to study if the latest editions of these documents can be applied. For undated references, the latest editions of the normative documents are applicable to this part.
GB/T 6529 Textiles-Standard Atmospheres for Conditioning and Testing (GB/T 6529—2008, ISO 139: 2005, MOD)
GB/T 16825.1 Verification of Static Uniaxial Testing Machines—Part 1: Tension/compression Testing Machines—Verification and Calibration of the Force-measuring System (GB/T 16925.1—2002, ISO 7500-1: 1999, IDT)
GB/T 19022 Measurement Management Systems-Requirements for Measurement Processes and Measuring Equipment (GB/T 19029—2003, ISO 10012: 2003, IDT)
FZ/T 01019 Textiles—Stitch Types—Classification and Terminology (FZ/T 01019—1992, eqv ISO 4915: 1991)
3 Terms and Definitions
The following terms and definitions are applicable to this Part of GB/T 13772.
3.1
Constant rate of extension (CRE) testing machine
A kind of testing machine to make direct ratio between sample extension and time when one clamper of clamp sample is fixed and the other moves at constant speed throughout the testing
3.2
Grab test
A kind of fabric tensile test, where the middle part of sample width is clamped by a clamper
3.3
Yarn slippage
Seam slippage
The weft (warp) in woven fabrics moves along warp (weft) due to extension.
Note: The seam slippage has fabric property and shall not be confused with seam strength.
3.4
Warp slippage
The warp is vertical to extension direction and moves along weft yarn.
3.5
Weft slippage
The weft is vertical to extension direction and moves along warp yarn.
3.6
Seam allowance
The distance between stitch line and selvage near seam material
3.7
Seam opening
The maximum width of seam after yarn slippage in fabric
4 Principle
The rectangular sample is seamed along the width after being folded; then it shall be cut alongside the folding line before using clamper to clamp the sample and exerting tension load perpendicular to seam direction; last, it shall determine the seam opening produced when exerting given load.
