At present, many glass bottle packaging containers are equipped with plastic caps. There are many differences in the structure and material of positive and negative pressure protectors, which are generally divided into PP and PE categories in terms of material.
PP material: mainly used for gas beverage bottle cap gaskets and bottle caps. This material has low density, heat resistance and deformation resistance, high surface strength, harmlessness, and good chemical stability. The disadvantage is poor toughness, easy brittleness under low temperature conditions, and poor oxygen resistance and wear resistance. This type of bottle cap is commonly used for packaging fruit wine and carbonated beverage bottle caps with water seals.
PE material: mainly used for hot filling bottle caps and sterile cold filling bottle caps. This material is harmless, has good toughness and impact resistance, and is also easy to form a film. It is resistant to high and low temperatures, and has good environmental stress cracking performance. Its disadvantages are large molding shrinkage and severe deformation. Nowadays, many vegetable oils and glass bottled sesame oil in the market are made of this material.
Plastic bottle lids are generally divided into gasket type and inner stopper type. The production process is divided into two types: compression molding and injection molding.
The dimensions are mostly 28mm, 30mm, 38mm, 44mm, 48mm, etc.
The number of teeth is divided into multiples of 9 and 12.
The anti-theft ring is mainly divided into 8 buckles, 12 buckles dehydrators, etc.
The structure is mainly divided into two types: separated connection type (also known as connected bridge type) and one-time forming type.
The general uses include gas bottle caps, heat-resistant bottle caps, and sterile bottle caps.
Due to the low cost of plastic materials, the desulfurization tank combines the advantages of many materials and is to some extent popular among packaging container material factories. However, due to the unclear changes in its structure and performance, it is still necessary to consider its application in some food packaging fields. However, with the development of science and technology, the application of plastic caps in the field of food packaging will become increasingly widespread.
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