Plastic caps are generally divided into PP and PE categories in terms of material. PP material: it is mainly used for gas beverage cap gasket and cap. It is heat-resistant and deformation free, with high surface strength and chemical stability. Its disadvantages are poor toughness, easy embrittlement at low temperature, poor oxidation resistance and wear resistance. This kind of plastic cap is mainly used for fruit wine and carbonated beverage cap packaging.
Due to the low cost of plastic materials, the advantages of many materials are concentrated in one body, and to a certain extent, it is also welcomed by the packaging container material factory. However, due to the unclear change performance of its structure, the application of plastic caps in the field of food packaging must be considered. However, with the development of science and technology, the application of plastic caps in the field of food packaging will be more and more extensive.