Discussion on optimization of injection molding process of polypropylene product from coal to olefin
The process parameters of polypropylene injection molding could affect the crystallization process,resulting in different mechanical properties of the product.In order to obtain the most suitable injection molding parameters of high melt index polypropylene from coal to olefin,according to the requirements of national standards,the injection parameters were adjusted,such as the injection speed,holding pressure,holding time,cooling time,mold temperature,etc.The tensile properties of the injection molded sample were tested to investigate the influence of various injection parameters on the mechanical properties of polypropylene.It was found that when the injection speed was 18 mm/s,28 mm/s,36 mm/s,18 mm/s,injection time was 1.73 s,holding pressure was 69.3 MPa,69.3 MPa,66.2 MPa,66.2 MPa,holding time was 40 s,cooling time was 18 s,and mold temperature was 40℃,the polypropylene product achieved the optimal mechanical properties.
coal based polypropyleneinjection molding processinjection speedholding pressurecooling timemold temperature
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