Plastic bottles have always been favored by people for their light weight, easy to carry, not afraid of falling, and acid and alkali resistance. Food, beverages, nuts, and honey have been covered by the plastic bottle industry, and even agricultural, animal, and medical packaging have been gradually replaced by plastic bottles. But do you know how plastic bottles are made?
No matter what kind of plastic bottle, it must be shaped. The molding process of the plastic bottle is a process of making a plastic product from a polymer such as a phenol resin, a urea resin, or an unsaturated polyester resin. The processing methods include compression molding, extrusion molding, injection molding, blow molding, calendering, and the like. Next, let's take a look at the processing methods of plastic bottles with Xiaobian.
1. Compression molding Compression molding is also called molding in the industry. The molding of thermosetting plastics such as phenolic resin, urea-formaldehyde resin and unsaturated polyester resin is the first step in the processing of plastic bottles.
2. Extrusion Extrusion, also known as extrusion molding, is a method in which an extruded resin is continuously passed through a die by an extruder to extrude a product of a desired shape. The utility model has the advantages that the product of various shapes can be extruded, the production efficiency is high, and the production can be automated and continuous; the disadvantage is that the thermosetting plastic cannot be widely processed by the method, and the product size is prone to deviation.
3, injection molding Injection molding can also be 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 to obtain a product 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 are especially suitable for mass production. The disadvantage is that the cost of equipment and mold is high, and the injection molding machine is not easy to clean.
4, blow molding Blow molding is also called hollow blow molding. Mainly by a method of inflating a hot resin parison closed in a mold into a hollow article by means of the pressure of compressed air, the blow molding comprises two methods of blown film and blown hollow article. The blow molding method is mainly used for the production of film products, various bottles, barrels, pots and the like.
5. Calendering is to process a resin or various additives into a film or sheet through the gap between two or more opposite rolling rolls of a calender after being treated as expected, and then peeled off from the calender roll, and then A molding method for cooling and setting. Calendering is the main forming method of polyvinyl chloride resin, and is the main means for manufacturing films, sheets, plates, artificial leather, floor tiles and the like.
6. Foaming molding The process of adding a suitable foaming agent to the foaming material to produce a microporous structure of the plastic. According to the cell structure, it is divided into open cell foam and closed cell foam, which is determined by the manufacturing method.
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