What are the performance characteristics and classification of plastic bottle caps?

Plastic bottle caps are something that we often see in our daily life. Mineral water bottle caps are made of plastic, edible oil bottle caps are also made of plastic, and the caps of many liquid bottles are made of plastic. The bottle caps have good leak-proof performance, and can effectively prevent the liquid in the bottle from being polluted by the outside world. So do you know what are the performance characteristics of plastic bottle caps? In addition, do you know what classifications it has?

The performance characteristics of plastic bottle caps:

1. Generally, there is a ring-shaped leak-proof ring on the top inner wall of the plastic cover; there are also ordinary plastic barrel 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 tension reinforcement.

3. At the same time, on the inner wall of the anti-theft ring, there are several sheet-shaped swinging pull wings evenly distributed.

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

Classification of plastic bottle caps:

According to the combination with the container, plastic bottle caps can be simply divided into the following three categories:

1. Screw cap

As the name implies, screw cap refers to the connection and cooperation between the cap and the container through its own threaded structure.

Thanks to the advantages of the thread structure, when the screw cap is tightened, a relatively large axial force can be generated through the engagement between the threads, and the self-locking function can be realized conveniently. At the same time, some precision requires higher positioning caps, and screw caps with threaded structures will also be used.

2. Flip top cap

The cap that fixes itself on the container through structures such as claws is generally called flip top cap.

The flip top cap is designed based on the high toughness of the plastic itself, especially materials with good toughness such as PP/PE, which can maximize the advantages of the claw structure. During installation, when the claws of the flip top cap are subjected to a certain amount of pressure, they can be temporarily deformed, stretching across the ratchet structure of the bottle mouth, and then under the action of the elasticity of the material itself, the claws quickly return to their original shape and hold tightly The mouth of the container whereby the lid can be secured to the container. This efficient connection method has been particularly favored in industrial mass production.

3. Pilfer-proof cap

Pilfer-proof cap is a kind of cap developed for anti-theft. It is made of aluminum pressed into a cylindrical shape, punched ( between the body and the flare ) and lined. The Pilfer-proof cap is rust-proof, easy to open, and can be re-capped when the content is not completely consumed. Pilfer-Proof caps are usually for carbonated drinks, health drinks, spirits and pharmaceuticals.

4.Child resistant cap

Child Resistant Caps use mechanisms that create much difficulty for kids to open a container. Some of these styles include line-up and pop-off caps, squeeze and turn caps, and push and turn caps. You will see either written or pictorial instructions on top of the cap. Similar to other caps, child resistant caps can have a variety of liners such as foam, foil, pulp, heat seal, PV and pressure sensitive.

5.Welding cover

A type of cap that directly welds the mouth of the bottle to the flexible package by means of heat fusion through structures such as welding ribs is called a welded cap. It is actually a derivative of the screw cap and the snap cap, but the liquid outlet of the container is separated and assembled on the cap. Welded caps are a new type of caps that appeared after plastic flexible packaging, and are widely used in daily chemical, medical, and food industries.

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