It's no exaggeration to say that the future is the world of plastic. There are many plastic container in our daily life like plastic bottles, plastic bags, plastic bucket and plastic boxes and so on. But do you know how to produce these plastic products? That is the injection mold machine for plastic container. In this passage, let’s tell you the manufacturing process of injection mold machine for plastic container.

Manufacturing process of plastic container

The molding process of plastic bottles refers to the process of making final plastic products from polymers manufactured by synthetic resin manufacturers. Processing methods (commonly referred to as one-time processing of plastics) include compression molding, extrusion molding, injection molding, blow molding, calendering, etc.

Compression molding

Compression molding is also called molding or press molding. Compression molding is mainly used for the molding of thermosetting plastics such as phenolic resin, urea formaldehyde resin and unsaturated polyester resin.

Extrusion molding

Extrusion, also known as extrusion molding, is a method of using an extruder to continuously pass the heated resin through the mold to extrude products of the required shape. Extrusion is also sometimes used in moulding of thermosetting plastics and can be used in molding of foamed plastics. The advantage of extrusion is that it can extrude products of various shapes, with high production efficiency and automatic and continuous production. The disadvantage is that thermosetting plastics can not be widely processed by this method, and the product size is easy to deviate.

Injection molding

Injection molding is a method of using injection molding machine (or injection machine) to inject thermoplastic melt into the mold under high pressure and obtain products after cooling and curing. Injection molding can also be used for molding thermosetting plastics and foam plastics. Injection molding has the advantages of fast production speed, high efficiency, automatic operation, and can shape complex parts, especially suitable for mass production. The disadvantages are high cost of equipment and mold and difficult cleaning of injection molding machine.

Blow molding

Blow molding is also called hollow blow molding or hollow molding. Blow molding is a method to blow the hot resin parison closed in the mold into hollow products with the help of the pressure of compressed air. Blow molding includes two methods: blow molding film and blow molding hollow products. Film products, various bottles, barrels, pots, containers and children's toys can be produced by blow molding.

Calendering

Calendering is a forming method in which the resin and various additives are processed into films or sheets through the gap between two or more calendering rollers of the calender turning opposite after expected treatment (kneading, filtration, etc.), then stripped from the calender roller, and then cooled and shaped. Calendering is a molding method mainly used for PVC resin, which can manufacture films, sheets, plates, artificial leather, floor tiles and other products.

Foaming molding

The process of adding appropriate foaming agent to foaming materials (PVC, PE, PS, etc.) to make plastics produce microporous structure. Almost all thermosets and thermoplastics can be made into foam plastics. According to the bubble structure, they are divided into open cell foams (most pores are interconnected) and closed cell foam (most pores are separated). This is mainly determined by the manufacturing methods (divided into chemical foaming, physical foaming and mechanical foaming).

In conclusion

The above are the producing process of plastic container. All the process are almost the same, the operator just adjust the template, mould size, injection moulding temperature and other conditions according to specific products.

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