What are the materials commonly used in plastic caps?
PE material: used for hot filling bottle and aseptic cold filling bottle, this material is non-toxic, good toughness and impact resistance, but also easy to film, high and low temperature resistance, environmental stress cracking performance is good, disadvantage is the molding shrinkage and deformation. Many vegetable oils, glass bottles of sesame oil and so forth are the materials on the market.
From the material, generally divided into PP class and PE class. PP material: used for gas beverage bottle and cap gasket, heat deformation, high surface strength, good chemical stability, the disadvantage is poor toughness, brittle under low temperature conditions, due to poor oxidation resistance, also do not wear. The bottle caps of this material are mostly used for wine and carbonated beverage bottle caps.
Plastic bottle lid gasket type plug type and general. The production process is divided into two kinds of compression molding and injection molding.The sizes are: 28 teeth, 30 teeth, 38 teeth, 44 teeth, 48 teeth, etc.. The teeth are divided into multiples of 9 and 12. Anti theft ring is divided into: 8 buttons, 12 buttons, etc.. The structure is mostly: separation connecting type (also known as connecting bridge type) and primary molding. Purposes are generally divided into: gas bottle caps, heat-resistant caps and aseptic caps.Because the plastic material has the advantages of low cost, concentrated a lot of material in a certain extent, also by the packaging materials factory welcome, but due to changes in performance of the structure is not very clear, some applications in the field of food packaging must consider, but with the development of science and technology, the application of the plastic cover in the field of food packaging will be more and more widely.
