Effects of film tension and contamination on the seal quality of flexible food packaging films made of polypropylene and low density polyethylene blends containing talc filler

Seal integrity and seal strength are important requirements in the heat sealing of flexible packaging. In this article, influence talc compounds different process parameters, such as film tension contamination on sealant films consisting polypropylene low-density polyethylene blend were investigated. According to results, increasing ratio from 0% wt 30% positively influenced both hot cold strength. Among polymer blends having same ratio, sample lowest melt flow index (2.84 dg/min at 230°C 2.16 kg) showed highest with 9.07 N/25 mm. On other hand, samples higher indexes, less issues observed presence contaminants. Elevated tensions 0 0.4 N/mm2 enhanced strengths significantly initiation temperatures each film. However, situation changed operating due increased orientation brittleness. Besides, contaminant coffee particles interphase, high adversely affected since average leakage 2.7% for A B, 7.4% C. summary, it has been shown that incorporation can improve strength, MFI fill gaps interphase levels (above 0.16 N/mm2) during well need be avoided ensure sealing.