TEST METHOD FOR SHRINK TENSION AND ORIENTATION RELEASE STRESS OF PLASTICS FILM AND THIN SHEETING
This Malaysian Standard covers the determination of the shrink tension and related characteristics, that is, shrink force and orientation release stress, of heat-shrinkable plastic film and sheeting of less than 1.0 mm (0.04 in.) thickness.Two procedures are described that permit the measurement of shrink forces at predetermined temperatures. They are as follows:
Procedure A is designed to measure the maximum force exerted by a specimen that is totally restrained from shrinking as it is heated rapidly to a specific temperature.
Procedure B is designed to measure the maximum force exerted by a specimen that is permitted to shrink a predetermined amount prior to restraint while being heated rapidly to a specific temperature.
Orientation release stress can be determined fro m the data obtained using Procedure A.
The values stated in SI units are to be regarded as the standard. The values in parentheses are for information only.
NOTE 1—There is no equivalent ISO test method.
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