Plastic caps are a common packaging form for bottles, cans, and barrels, especially in the fields of beverages, chemicals, and medicine. According to their uses, they can be divided into breathable plastic caps and airtight plastic caps.

The plastic cover is generally made of polyolefin as the main raw material, which is processed by injection molding, hot pressing and other processes. The plastic anti-theft cover not only needs to be easy for consumers to open, but also needs to avoid leakage problems caused by poor sealing performance. How to reasonably control the sealing performance of bottle caps is the focus of on-line or off-line inspection of production units.

performance characteristics

1. There is an annular leak-proof ring on the top inner wall of the general plastic cover; there are also ordinary plastic bucket covers that need to match the inner cover, so there is no need to design a leak-proof ring;

2. The lower end of the plastic cover is connected to an anti-theft ring through the tensile reinforcement;

3. At the same time, there are several sheet-like gyratory tension wings evenly distributed on the inner wall of the anti-theft ring;

The plastic bucket lid designed in this way has the characteristics of firm sealing, good leak-proof and anti-theft performance, safe and convenient use, can effectively prevent the liquid in the container from being polluted by the outside, and can ensure that the packaging of various liquid products conforms to national safety standards.

Diagram of plastic bucket lid

One: no air cover

Air-free cover is also called sealing cover, plastic cover, anti-theft cover, etc.

It has good sealing performance, and there is an annular leak-proof ring on the top inner wall of the general plastic cover; there are also ordinary plastic bucket covers that need to be matched with the inner cover, so there is no need to design a leak-proof ring; there are several edges around the main body of the plastic cover, Facilitates the application of torque on the plastic cover.

Two: air cap

Air caps are also known as vent caps, vent caps, combined vent caps, and the like.

The breathable cover is generally composed of a main body outer cover with small holes and an inner cover with a breathable film. The breathable film can effectively exhaust the effect of blocking liquids. The product expands or contracts due to physical or chemical changes.

Three: inner cover

The inner cap also becomes the inner plug, the inner cap of the barrel mouth, the inner cap of the bottle mouth, the stopper, etc.

Generally, containers with a capacity of more than 3L can be equipped with an inner cover. The inner cover increases the sealing degree of the container, and the sealing effect is better than that of a single outer cover!

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