Methods to Determine Zipper Strength |
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To determine ordinary zipper
strength,
A zipper chain is interlocked,pulled
at a flxed speed at a right angle to
the chain inter_locked direction,and
the resustance is measured. |
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The open part is fixed to
the tensile
tester (only the open part as shown
in the figure into line with the clanp
edge and the tensile strength can be
measured) |
 |
The lower part of an interlocked
zipper
is fixed and the slider is pulled up to
the stop.Holding strength is measured by
pulling the slider to stop firmly |
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A slider is locked at the
middle of a
zipper chain and single chains are opened
to the right and left sides.Locking stren-
gth and resistance of the elements inside
the slider are measuted. |
 |
A slider is pulled down to
the bottom
stop and single chains are spened to
the right and left sides.Bottom stop
holding strength and resistance of
the elements inside the slider are
measured. |
 |
For a comoleted slider,resistance
of
the slider's measured when power is
put in the pull tab and the lower part of
the body.In addition to the 90° degree
method of meauring shown in the flgure
at left,there is one of 45° degree. |
