Do You Know These Plastic Bottle Processing Terms?

The molding process of a plastic bottle refers to a process of making a final plastic article from a polymer manufactured by a synthetic resin manufacturer. Processing methods (often referred to as primary processing of plastics) include compression molding (molding), extrusion (extrusion), injection molding (injection molding), blow molding (hollow molding), calendering, and the like.

1.Compression molding

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

2. Extrusion

Extrusion, also known as extrusion molding, is a method of extruding a heated resin through a die using an extruder (extruder) to extrude a desired shape of the article. Extrusion is sometimes also used in the formation of thermoset plastics and can be used in the formation of foams. The advantage of extrusion is that it can extrude various shapes of products, and has high production efficiency and can be automated and continuously produced. The disadvantage is that thermosetting plastics cannot be widely processed by this method, and the product size is prone to deviation.

3. Injection molding

Injection molding is also called injection molding. Injection molding is a method in which a thermoplastic melt is injected into a mold under high pressure using an injection molding machine (or an injection machine) to obtain a product by cooling and solidifying. Injection molding can also be used to form thermoset plastics and foams. The advantages of injection molding are fast production speed, high efficiency, automatic operation, and the ability to form parts with complex shapes, especially for mass production. The disadvantages are high equipment and mold costs, and it is difficult to clean the injection molding machine.

4. Blow molding

Blow molding is also called hollow blow molding or hollow molding. Blow molding is a method in which a hot resin parison closed in a mold is inflated into a hollow article by the pressure of compressed air, and the blow molding includes two methods of blown film and blown hollow article. Film production, various bottles, barrels, pots and children's toys can be produced by blow molding.

5. Calendering

Calendering is the process of processing (kneading, filtering, etc.) the resin into a film or sheet by the gap between two or more opposite rolling rolls of a calender, and then peeling off from the calender roll. , a molding method that is cooled and shaped. Calendering is a molding method mainly used for polyvinyl chloride resins, and can manufacture films, sheets, sheets, artificial leathers, floor tiles and the like.

6. Foaming molding

A foaming material (PVC, PE, PS, etc.) is added to a suitable foaming agent to cause the plastic to produce a microporous structure. Almost all thermosets and thermoplastics can be made into foam. According to the cell structure, it is divided into open-cell foam (which means that most of the pores are connected to each other) and closed-cell foam (most of the pores are separated from each other), which is mainly manufactured by chemical foaming and physical foaming. And mechanical foaming).

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