Plastic jars have not appeared for a long time, but they have developed very rapidly. In many cases, they have replaced metal cans and glass bottles, mainly because they have many advantages:
(1) Light weight. The density of materials used to make plastic jars is small, and plastic jars are smaller than metal jars and glass bottles according to the same volume and quality of containers.
(2) Low cost. The material cost of plastic jars is lower and the manufacture is easier, so the total price is cheaper.
Reliable protection of products. The tank body is made of a variety of materials, which has good chemical stability and barrier. The combination of bottom, cover and tank body adopts reliable sealing structure, so the inner contents can be reliably protected.
The mechanical strength is good. Although the mechanical properties of plastic jars are slightly lower than those of metal jars and glass bottles, they are sufficient for general packaging products and rarely cause strength damage.
The shelf effect is good. The surface of plastic jars is easy to print and decorate, which is good for attracting customers and promoting sales.
Plastic jars also have some shortcomings: for example, the sealing quality between the bottom cover and the tank body is still unstable; when vacuum packaging and pressure packaging are carried out, the strength of the tank body is sometimes not high enough.
As a new type of packaging container, plastic jars are widely used in the packaging field.