Shrink force is defined as the lengthwise contraction force of
Hi-Shrink Tape when it's heated and fully restrained.
When heated, Hi-Shrink Tape shrinks in the lengthwise direction only.
It will start to shrink at 175° F. It reaches maximum shrink force at 300° F.
In use, the practical temperature range is between 200° F and 400° F. Outside this range, the shrink force tends to drop off rapidly ( Fig 1). At 300° F, .002° thick tape will shrink about 20% if unrestrained ( Fig 2). If fully restrained, it will exert a shrink force of about 2500 PSI ( Fig 1). Full shrink force is reached within a few minutes after exposure to temperature. This shrink force is then maintained without relaxation during any baking and cooling periods.
In shrinking, the tape tends to shorten in length and become slightly wider. The thickness remains relatively unchanged.
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