This part of GB/T 3903 specifies two test methods for determining the seam strength of uppers, lining or insocks, irrespective of the material, in order to assess the suitability for the end use.
This part is applicable to all types of uppers, lining and insocks for footwear.
These methods are:
— Method A: Needle perforations. For determining the force required to pull a row of needles through an upper material, in a direction perpendicular to the row.
— Method B: Stitched seams. For determining the breaking strength of stitched seams in shoe upper and lining materials. This method is applicable to seams cut from shoes or made up to simulate footwear constructions.
2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of GB/T 3903. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this part are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.
GB/T 16825.1-2008 Metallic Materials — Verification of Static Uniaxial Testing Machines — Part 1: Tension/Compression Testing Machines — Verification and Calibration of the Force-measuring System (ISO 7500-1:2004, IDT)
GB/T 22049 Footwear — Standard Atmospheres for Conditioning and Testing of Footwear and Components for Footwear (GB/T 22049-2008, ISO 18454:2001, IDT)
GB/T 22050 Footwear — Sampling Location, Preparation and Duration of Conditioning of Samples and Test Pieces (GB/T 22050-2008, ISO 17709:2004, IDT)
3 Terms and Definitions
For the purposes of this part of GB/T 3903, the following terms and definitions apply.
