Abstract
Heat seal strength and quality of HDPE blown films with addition of 4 different polyolefins (LLDPE-g-MAH, LDPE-g-MAH, POE-g-MAH, and PP) were investigated. HDPE contained 1 wt% to 5 wt% of each polyolefin was passed though film blowing process followed by heat sealing temperature as low as 140 ℃. The sealing time ranged from 1 s to 5 s. Peeling test on films led to seal strength and type of failure considered as seal quality. Type and content of added polyolefin affected both of them. Different thermal properties of polyolefin, as a function of corresponding microstructure, is a key parameter which determined the way in which sealing quality of HDPE was influenced. Besides that, dwell time was found to be a critical parameter specially for sealing quality. All additives improved the heat seal properties, but in their special conditions.
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