The world of plastics is incredibly complex. There are so many different processes that go into creating plastic packaging, and one of the most popular methods of mass-producing plastic bottle containers is PET Blowing Machine . Currently, there are three different forms of blow molding: extrusion blow molding, injection blow molding, and stretch blow molding. There are multiple reasons why any company would choose either process. Confused? Take a look below at our beginner’s guide to the different types of blow molding to help you learn more.
There are currently three main methods used to create blow moulded products. The different methods each have their individual advantages and disadvantages, and it is up to manufacturers to select the method that best suits their needs. These methods are:
Extrusion blow moulding:
Extrusion blow moulding is the process best suited to creating complex product shapes. During this process, plastic is melted and then extruded into a hollow tube, also known as a parison. The parison is closed, and the desired shape is achieved by blowing air into the warm plastic. Once the piece is cooled, it is ejected. Extrusion blow moulding can be either continuous or intermittent.
Injection blow molding: This is another variant of the blow molding process. It is mainly used in manufacturing hollow plastic and glass bottles or objects in huge quantities. This is a simple process whereby the polymer is injected and moulded on to a core pin. This core pin is then rotated to a molding station where it is left to be chilled and inflated. This is the least used process of blow molding and is used mainly for manufacturing small bottles or medical syringes.
Injection stretch molding: This process again tales two forms namely, single-stage and double-stage molding process. In both these stages, the plastic is first melted and shaped into a preform with the help of the injection blow molding process. The preforms are made with the bottlenecks which include threads at one of their ends. The preforms are then packaged and fed into a heat stretch blow molding machine. In this process of blow molding, the preforms are exposed to infrared heaters at temperatures above the glass transition temperature. They are then blown using very high-pressure air into the bottles with the help of metal blow moulds.
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