to Determine Zipper Strength
There are various methods by which to evalute zippers
strength. The basic strength can can be determined based on the result
of the following inspection methods, from which all around strength appropriate
for respective uses can be juged. (Based on JIS-S3015)
*Tensile tester: Tensile velocity is 300mm/min, Clamp with is 25mm.
Crosswise srength of chain (per 2.5cm)
To determine ordinary zipper strength: a zipper chain is
interlocked, pulled at a fixed speed at s rigth angle to the chain interlocked
direction,and the resistance is measured.
Vertical tensile strength of the top stop
The lower part of an interlocked ziper is fixed and the slider is pulled
up to the top stop.Holding strngth is measured bu pulling the slider top
Bottom stop tearing strength
A slider is pulled down to the bottom stop and single chains
are opened to the right and left sides. Bottom stop holding strength and
resistant of the elements inside the slider are measured.
Horizontal tensile strength of the box
The open part is fixed to the tensile tester (only the
open part as shown in the figure) so that the end of the last element
falls into line with the clamp edge and the tensile strength and resistance
of the elements inside the slider are measured.
Slider lock strength
A slider is locked at teh middle of a zipper chain and single chains
are oped to the rigth and left sides.Locking strength and resistance of
the elements inside the slider are measured.
Overall atrength of the slider (90 degree)
For a completed slider,resistance of the slider is measured
when power is put on the pull and the lower port of the body. In addition
to the 90 degree method of measuring shown in the figure at left, there is
one of 45 degree.
zipper meets UK standards of durability and passes the above JIS strength tests.
is registered Trade Mark of YKK Corporation
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