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Firstly, it is about oil contamination on its own. The oil contamination can be called the extra oil on surface of the aluminum foil which appears after rolling procession. These oils are dirty with complex components. They were thrown from the roll neck or the opening position of the machine, splashed and dripped on the foil surface.

Raw materials: The raw materials of plastic bags, including plastic particles and additives, etc. Custom plastic bags use different raw materials, the price will be different, the better raw materials, the higher the cost, plastic bags will be higher prices.

1. Can be printed on five sides, adequate printing surface makes the information description and pattern design of products more abundant. 2. Vertical structure, can stand on the shelves, stable standing.

Chocolate is fermented and roasted with cocoa beans, and added to milk powder, sugar, stirring and coagulation after the cocoa butter is squeezed. Compared with other vegetable oils, cocoa butter is more likely to absorb odor. The remaining portion of chocolate which is stored in the refrigerator without being re-wrapped will be contaminated by other things.