Calculation method of plastic film bag price

Price = length (M) X width (M) X 2S X density of plastic bags * market price, where s is the thickness of plastic bags and needs to be multiplied by the density. Not all plastics have a density of 1. In addition, the market price refers to the ton price of printed plastic bags, not the price of raw materials. Plastic printing plants should be profitable. The plate-making fee is divided into electric engraving and etching. According to the surface area of each printing roller, the price is about 0.30 yuan per square centimeter and 0. 10 yuan respectively.