The melt index of polypropylene is 53.0–76.9 g/10 min; all specifications are met. A sieve is used before packaging, and the polypropylene in the packaging bags is clumped
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Dear masters, we use an intermittent liquid-phase bulk polymerization process. Recently, the polypropylene product has been forming lumps and flakes with a width of less than 1.8 cm. The melt flow rate ranges from 53.0 to 76.9 g/10 min, and the analysis parameters such as the isotactic index, ash content, chlorine content, and volatile matter are all within acceptable limits. Moreover, before the polypropylene is put into the packaging bag, there is a sieve to check that it is in good condition with no abnormalities. May I ask everyone, why does this phenomenon occur?
Lumps were found in the packaging, but there is a sieve before the polypropylene enters the packaging bag. Since the sieve was found to be in good condition with no abnormalities, it’s possible that the material does not clump together; so where does the clumping occur inside the packaging?