Bottle caps are an important part of food and beverage packaging, and they are also the place where consumers come into contact with products. Bottle caps have the ability to maintain the airtightness of the contents of the product and also have the function of anti-theft opening. Therefore, they are widely used in bottled products. Therefore, bottle caps are upstream industries in the food, beverage, alcohol, chemical, and pharmaceutical industries, and are key products in bottle container packaging. At the early stage of the development of bottle caps, cork materials, Tinning crown caps and screw on caps were used. To date, aluminum long neck caps, carbonated drinks aluminum caps, hot filling aluminum caps, injection aluminum caps, drug caps, open ring caps, plastic bottle caps and other products have been developed.
Due to the fact that bottle caps are an important part of the beverage packaging industry, the strong changes in downstream consumer market demand will directly affect the market demand for bottle caps. The booming development of the beverage industry has higher requirements for product packaging, which in turn drives the demand for bottle cap products. And bottle cap products occupy a crucial position in the beverage packaging industry, so the development trend of the beverage industry will directly affect the demand for bottle cap products. In recent years, the demand for bottle cap products in the market has been stable and showing a growing trend. However, changes in the packaging materials used have relatively led to changes in the variety structure of bottle cap products; Overall, it will improve the usage ratio of plastic caps. Although some aluminum lids are replaced by plastic lids, they are mainly used in wine and Functional beverage. The demand for aluminum lids has grown steadily, while the demand for claw lids has changed greatly.
What are the sealing methods for plastic bottle caps?
According to common sealing forms, plastic bottle caps can be further divided into two categories:
1、 Cone sealing
A conical annular sealing ring is designed on the top surface of the inner side of the bottle cap, which extends into the bottle mouth and fits tightly with the inner side of the bottleneck. The conical sealing ring is tightly attached to the inner side of the bottleneck, blocking all gaps and achieving container sealing.
Derived Structure – Sealing Needle Structure
For containers with smaller outlet diameters, the sealing of the container can also be achieved by directly using a conical cylindrical sealing needle and an interference fit at the outlet.
2、 Liner sealing
A piece of elastic gasket is placed on the inner side of the bottle cap with this structure, and the bottle cap compresses the elastic gasket onto the mouth of the container through its own structure, achieving the sealing of the container. Common elastic gaskets include PE/EVA foam materials, silicone, rubber, etc.
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