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. Screw cap
As the name suggests, screw cap means that the cap is connected and matched with the container by rotating through its own thread 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, making it easy to realize the self-locking function. At the same time, some caps that require higher precision positioning will also use screw caps with threaded structures.
Features: Tighten or loosen the lid by rotating the lid.
2. Snap cover
The lid that fixes itself on the container through structures such as claws is generally called a snap lid.
The snap cover is designed based on the high toughness of 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 cap are subjected to a certain amount of pressure, they can deform briefly and stretch across the ratchet structure of the bottle mouth. 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 a container, whereby the lid can be fastened to the container. This highly efficient connection method is particularly popular in industrial mass production.
Features: The lid is fastened to the mouth of the container by pressing.
3. Weld and connect the cover
A type of lid that directly welds the bottle mouth part to the flexible packaging through welding, ribs and other structures using hot melt, is called a welded lid. It is actually a derivative of the screw cap and snap cap. It just separates the liquid outlet of the container and assembles it on the cap. Welded lids are a new type of lid that emerged after plastic flexible packaging and are widely used in the daily chemical, medical, and food industries.
Features: Welding. The bottle mouth part of the lid is welded to the flexible packaging by hot melting.
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