Basic classification of plastic bottle caps

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

1. Plastic bottle cap - screw cap

As the name suggests, screw cap means that the cap is connected and matched with the container through its own threaded structure and by means of rotation.

Thanks to the advantages of the threaded structure, when the screw cap is screwed, a relatively large axial force can be generated through the engagement between the threads, and the self-locking function can be easily realized. At the same time, some caps with high precision need to be positioned, and screw caps with threaded structures are also used.

plastic screw cap

Features: Tighten or loosen the cover by rotating the cover.

Advantages: Strong self-locking ability, the cover is not easy to be pulled out, and the cover is evenly stressed in the axial direction, which is conducive to sealing.

Disadvantage: high manufacturing cost

Occasion of use: packaging with high sealing requirements and precise positioning requirements

2. Plastic bottle caps - snap caps

The cover that fixes itself on the container through structures such as claws is generally called a snap cover.

The snap cover is designed based on the high toughness of the plastic itself, especially the materials with good toughness such as PP/PE, which can maximize the advantages of the claw structure. During installation, when the claws of the snap cover are subjected to a certain amount of pressure, they can deform for a short time, and stretch across the ratchet structure of the bottle mouth. The mouth of the container, whereby the lid can be fastened to the container. This efficient connection method is particularly favored in industrial mass production.

Plastic snap cover

Features: The lid is fastened to the mouth of the container by pressing.

Advantages: easy to install the cover, low manufacturing cost.

Disadvantage: The axial force is uneven, and it will be pulled out under the action of a certain force.

Use occasion: low-cost FMCG packaging.

3. Plastic bottle caps - welded caps

Through welding ribs and other structures, a type of lid that directly welds the bottle mouth part on the flexible packaging by means of hot melt is called a welded lid. 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 cover is a new type of cover that appeared after plastic flexible packaging, and is widely used in daily chemical, medical, and food industries.

Plastic Weld Cover

Features: The bottle mouth part of the welded lid is welded on the flexible packaging by hot melting.

Advantages: low cost, environmental protection.

Disadvantages: low consumer experience.

Occasion: Replacement pack, promotional pack.