KPP Zipper implements strict quality control system for the top quality products.
Slider pull, pull-off
Slider pull twist-off
01.Chain crosswise strength test
A chain is fixed into a tensile strength tester and subject to a series of standard loads at a constant rate.
02.Slider pull, pull-off strength test
A slider unit is installed into a tensile strength test. A pull-tab is orientated normal to the slider body, and the standard tensile loads with the increasing magnitude will be applied to the pull-tab.
The repeated movements of open and close are applied to zippers with a reciprocating distance of 75 mm, a repetition rate of 30 times per minute, and opening and closing angles of 30 and 60 degrees respectively. This test is repeated for 500 times and reveals the durability of the products.
04.Slider pull twist-off strength test
In this torsional strength test, the slider body is fixed at both ends and the pull-tab is twisted under the standard loads.