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I received many emails & call to write note
on Zipper Testing, respecting their will below are some useful
information on Zipper testing.
ZIPPER AND SLIDER 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 failure. 
TOP STOP
HOLDING STRENGTH
The lower
part of an interlocked Zipper is clamped and the Slider is pulled
right up to
the top stop. Holding strength is measured by pulling the Slider
against the
Top Stop in the Tensile Testing machine.
BOTTOM STOP HOLDING
STRENGTH
A slider is
pulled down till the end so that it touches the bottom stop and then
the top single chains are opened to the right and left sides and are
clamped in the Tensile tester. Bottom stop holding strength and
resistance of the Zipper teeth inside the Slider are measured.
BOX HOLDING STRENGTH
The open part is fixed to the tensile tester clamps.
The clamps cover only on the area where
the reinforcement tape exists as shown in the figure and the tensile
strength is measured till failure.
SLIDER LOCK STRENGTH
A slider is
locked around the middle of a zipper chain and top single chains are
opened to the right and left sides. Locking strength of the Slider
to the Zipper and resistance of the teeth inside the slider are
measured.
TENSILE STRENGTH OF THE SLIDER
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.
Crosswise Tensile
Strength Test Results for CFC Zippers
Test Procedure as per
JIS-S3015, DIN-3416, DIN-3418, DIN-3419 , A.S 2332, B.S 3084
ITEM BEFORE TEST AFTER TEST BREAKING
STRENGTH KGF
More test methods page under construction
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