At first glance, a Open End Nylon Zipper is a simple device. But behind this simple look is complex craftsmanship, and zippers require the structural integrity of the components to function flawlessly. Every link has to fit correctly, every tooth has to be precisely shaped, and any defect can cause the entire zipper to jam or fail altogether.
Black Teeth Metal Zipper are often used as fasteners for various garments, so they are subject to the same exacting standards as the garments tested (for example, tests that simulate frequent laundering and daily wear and tear).
Below are some of the quality standards commonly used in the production of SWELL zippers.
SIZE
The Metal Zipper Log Chain should perform its full function during the time of use. After statistical analysis, all components of the zipper are carefully dimensioned and inspected to ensure they are within a specified size range. If the size is not correct, it will affect the usability of the zipper and garment.
STEENGH
Zippers, especially heavy duty zippers, should be sufficiently abrasion and tear resistant when attached to clothing and items that they will not break or separate after prolonged wear or tear. Therefore, the components of the entire zipper, such as fastener elements and cloth tapes, should be able to have sufficient strength.
FLATNESS
To test the flatness of the zipper, the zipper passes through a gauge set at a specific height. If any part of the zipper comes into contact with the gauge, it is classified as defective, uneven and should be recycled immediately. Also, lay the zipper flat and measure along the vertical edges to make sure the zipper doesn't bend.
PULLING AND CLOSING SMOOTHNESS
Use a special pull test machine to measure the pull required to close or open the zipper. Lightweight zippers (generally used in clothing) typically require less pull to close than zippers used in mattresses and bags because everyday clothing requires ease of donning.
WASHABILITY
Test the washability of the zipper by repeatedly washing the zipper with hot water, bleach, and abrasive. The washability of the zipper is used to test whether the zipper material has faded to ensure that the zipper will not undergo staining, color migration, etc. during the washing process.
As for shrinkage, measure the zipper length before washing, re-measure the zipper length after several washes, and calculate the shrinkage. The shrinkage rate of light zipper products of SWELL zipper is controlled at 1% - 4%. And for heavy duty zippers, SWELL's goal is always zero shrinkage.
Post time: Aug-08-2022