1. Screw cap
As the name implies, screw cap means that the cap is connected and matched with the container through its own threaded structure.
Thanks to the advantages of the helical thread structure, when the screw cap is tightened, a larger steering force can be generated through the embrace between the helical threads, and the self-locking function is conveniently realized. At the same time, some precision needs to determine the relatively high position of the cover, and the screw cap with screw structure will also be 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
The axial force of the cover is balanced, which is good for sealing
Advantages: high manufacturing cost
Occasions of use: high sealing needs to apply for packaging
Packages with exact identified need
2. Snap-on cap
The bottle cap that fixes itself on the container through structures such as claws is generally called a snap cap.
The snap-on cover 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 snap-on 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 connection method has been particularly favored in industrialized mass production.
The Plastic snap cover
The Features: The lid is fastened to the mouth of the container by pressing
The Advantages: easy to cover, low manufacturing cost
The Disadvantage: uneven axial force
The Under the action of a certain force, it will be pulled out
The Occasions of use: low-cost fast-moving consumer goods packaging
3. Welding cap
A type of bottle 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 emerged after plastic flexible packaging, and are widely used in the daily chemical, medical, and food industries.
Plastic welding cover
Features: The bottle mouth part of the welding cap is welded to the flexible package by hot melting
Advantages: low cost, environmental protection
Disadvantage: low consumption experience
Occasions of use: replacement packs, promotional packs
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