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In the process of vacuum molding, the best molding performance of modified polypropylene sheet is to mix (20% - 30%) low density polyethylene (PE).

The requirements of polypropylene for molding conditions, mold demoulding angle: male mold 20-3o (optimal 5O), female mold 1o-3o (optimal 5O); molding temperature: sheet temperature 150-180 ℃, mold temperature 70 ℃ - 90 ℃; molding shrinkage: male mold 0.02-0.03mm/mm, female mold 0.03-0.04mm/mm. As polypropylene sheet has the characteristics of rich material sources, low price, non-toxic, tasteless, good transparency, high mechanical strength, etc., it is widely used in food, medicine, mechanical parts, daily necessities and other packaging products. At present, polypropylene packaging products in the market, in addition to simple lunch boxes, shuipu, spoons, bowls, pickle boxes, all kinds of native product packaging boxes, yoghurt cans, trays, etc. have also entered the market widely. Polypropylene products can be heated in microwave oven and sterilized at 125 ℃, so they are widely used in ready to eat food packaging. In addition, polypropylene vacuum molding products have been gradually applied in agricultural production in recent years, such as seedling tray, breeding cup, etc.