April 21, 2009 -
PRLog -- BOPP shrinkage testing is very important for BOPP film quality. BOPP film heat shrinkage is mainly used for the evaluation of heat stability under different conditions or different factors. For rigid cigarette package, such rigid package has good supporting effect, around which high shrinkage film can be applied so as to achieve even and beautiful visual effects. Therefore, rigid package requires the heat shrinkage of BOPP cigarette film to be up to 8% to 12%. But, deformation caused by high shrinkage rate is a problem for ordinary flexible cigarette package. Generally, the shrinkage rate is controlled within 3%-7%. For heat shrinkage testing of BOPP cigarette film, ASTM D 2732 or GB/T 13519 is applied. Take Labthink PARAM RSY-R2 Film Free Shrink Tester as an example; mark the vertical and crosswise lines on the specimen with clear indication of direction. Put the specimen in between the frame, and immediately emerge into 120±2C constant temperature medium for 20 seconds. Then, emerge the specimen into the prepared normal temperature bath for 5 seconds, and take it out. Lay horizontally and measure the vertical and crosswise size within 30 minutes. The measurement should be with accuracy up to 1 mm. At present, some companies heats 1 minute, 5 minutes or other conditions under 120C with different testing results.
Further information please feel free to contact Shirley Wu via trade2@labthink.cn, skype:shirley-
labthink, MSN:shirleywu_
labthink@hotmail.com or (tel)0086-531-
85068709.
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