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Analysis of and measures against"color particle" in the polypropylene product
Author(s): 
Pages: 62-64
Year: Issue:  2
Journal: China Synthetic Resin and Plastics

Keyword:  polypropylenecolor particleexceeding the standardcausemeasure;
Abstract: The phenomenon of "color particle" in the polypropylene product was analyzed. The results show that "color particle" is attributed to the moisture carried by the polypropylene powder entering the extruder and the moisture in the polypropylene powder is correlated with the medium such as steam and cycle nitrogen. Some measures have been adopted, including eliminating the defects of the process equipment and modifying the process procedures to remove the moisture carried by the polypropylene powder. Among these measures, the water accumulated at the bottom of the power storage bin is drained; meanwhile the stuff at the bottom of the power storage bin is utilized as the scrap which can be used to purify the equipment during the extruder start-up. Consequently, the quality problem of "color particle" which is resulted from moisture carried by the powder during the extruder start-up and shut-down has been solved.
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