The plastic film formed by blow molding is subjected to biaxial stretching during processing, and its stretching ratio varies depending on different materials, but generally 2-3 times. Therefore, compared to injecting plastic materials with the same amount of powder, the density of blow molded films is much smaller. The experimental results also indicate that even in injection molding, if the injection pressure and holding time can be well controlled, and the same formula and processing equipment are used, the density of injection molded product data can reach 3-4% change
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