Thursday, September 3, 2009

ZIPPER AND SLIDER TESTING

I received many calls to write note on Zipper Testing, respecting their will below are some useful information on Zipper testing.

There are various methods to evaluate Zipper & Slider quality. The procedures in various quality
standards worldwide are more or less similar and are documented well under ASTM, ISO, BIS, JIS,
DIN, ISI and other well known International Standards.
Zipper & Slider strengths are checked as a routine inspection, For this the method laid out in
JIS-S3015 is used. The same standard is used by the YKK also, the world's leading Zipper manufacturer.
The basic strength can be determined based on the following inspection methods, from which all round
strength appropriate for respective uses can be judged.

TENSILE TESTING OF CROSSWISE ZIPPER STRENGTH
To determine the Zipper Strength the Zipper Chain in closed position is clamped
in-between specially designed Jaws of 25 mm width and pulled at a fixed speed
at 90 degree angle to the chain interlocked direction.
The resistance is measured in Kgf till failur

TENSILE STRENGTH OF THE SLIDER

Slider tensile strength test

The Body to Puller Strength is measured by this test. The complete slider is mounted on a special jig and load is applied to the Puller while keeping the Body fixed at 90 degrees. The resistance of the slider is measured till failure and is recorded in Kgf.
Tensile Tester velocity used in the above tests varies between 100~300 mm / min and the standard Clamp width used is 25mm.
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