Plastic bottles are widely loved by dealers and consumers for their light weight, easy carrying, no fear of falling, and acid and alkali resistance. Plastic bottles have become an important part of life. Beverages, food, pickles, and honey have been covered by the plastic bottle industry, and even agricultural, animal, and medical packaging have gradually been monopolized by plastic bottles. But do you know how plastic bottles are made? Let ’s take a look at the four processing methods of plastic bottles.
1. Compression molding, it is used for the molding of thermosetting plastics such as phenolic resins and unsaturated polyester resins. It is the first step in the processing of plastic bottles.
2. Extrusion molding, it is a method of continuously extruding heated resin through a die with an extruder to extrude a product of a desired shape. Its advantages are that it can extrude products of various shapes, high production efficiency, and can be automated and continuous production; the disadvantage is that thermosetting plastics cannot be widely processed by this method, and the product size is prone to deviation.
3. Injection molding, it is a method in which a thermoplastic melt is injected into a mold under high pressure by using an injection molding machine, and the product is obtained by cooling and solidifying. The advantages of injection molding are fast production speed, high efficiency, automatic operation, and the ability to form parts with complex shapes, which is especially suitable for mass production. The disadvantage is that the cost of equipment and molds is high, and the injection molding machine is not easy to clean.
4, blow molding, it is also called hollow blow molding. A method for inflating a hot resin parison closed in a mold into a hollow product mainly by using the pressure of
compressed air. Blow molding includes two methods: blown film and blown hollow product. The blow molding method is mainly used for producing film products, various bottles, barrels, pots, and the like.