Plastic bottle cap is a common thing in our daily life. Mineral water bottle cap is plastic, edible oil bottle cap is also plastic. Many liquid bottle caps are made of plastic. The caps made of this material have good leakproof performance and can effectively prevent the liquid in the bottle from being polluted by the outside world. So do you know what the performance characteristics of plastic caps are? In addition, do you know what classification they have? Let's give you a detailed introduction, let's have a look!
Performance characteristics of plastic caps:
1. The inner wall of the top of the general plastic cover is provided with a ring-shaped leak proof ring; there are also general plastic covers that need to be matched with the inner cover, so the leak proof ring need not be designed.
2. The lower end of the plastic cover is connected with an anti-theft ring through a tensile reinforcement.
3. At the same time, several pieces of gyrotron wings are evenly distributed on the inner wall of the anti-theft ring.
The plastic lid designed in this way has the characteristics of firm sealing, good leakproof and anti-theft performance, safe and convenient use, can effectively prevent the liquid in the container from external pollution, and can ensure that the packaging of various liquid products meets the national security standards.
Classification of plastic caps:
According to the combination method with the container, plastic bottle caps can be simply divided into the following three categories:
As the name implies, the cover refers to the cover through its own thread structure, and the container is connected and matched by rotation.
Thanks to the advantages of screw structure, when the screw cap is screwed, it can produce relatively large axial force through the engagement between the threads, which is very convenient to realize the self-locking function. At the same time, some covers with high accuracy need to be positioned, and screw caps with screw structure will also be used.
Features: tighten or loosen the cover by rotating the cover.
2. Snap cover
The cover which is fixed on the container by claw and other structures is generally called snap cover.
The buckle cover is designed based on the high toughness of the plastic itself, especially PP / PE, which has better toughness and can give full play to the advantages of the claw structure. During the installation, the claw of the buckle cover can undergo a short-term deformation when subjected to a certain amount of pressure. It stretches across the ratchet structure of the bottle mouth. Then, under the effect of the elasticity of the material itself, the claw quickly returns to its original state and holds the mouth of the container tightly, so that the cover can be fixed on the container. This kind of efficient connection method has been particularly favored in the mass production of industrialization.
Features: the cover is fastened at the mouth of the container by pressing people.
3. Welded cover
A kind of lid, which is welded directly on the soft package by welding ribs and other structures and by means of hot melting, is called welding lid. It is actually a derivative of screw cap and snap cap. It just separates the liquid outlet of the container and assembles it on the cap. Welded lid is a new type of lid after plastic flexible packaging, which is widely used in daily chemical, medical and food industries.
Features: the bottle mouth part of the welding cover is welded on the soft package by hot melting.
The above is about the introduction of the performance characteristics and classification of plastic bottle caps. Interested friends can learn about it and consult us if they have relevant questions.