How Injection Moulding Help Create Bottles & PET Preforms?

1. How Injection Moulding Help Create Bottles & PET Preforms? We use a lot of plastic products on a daily basis. The water bottle is a prime example. Have you ever wondered how they are made? They are made by the process of moulding. Plastic granules are used in the manufacturing process. The process requires a specific moulding machines and moulds for the creation of a wide variety of plastic bottles. Injection moulding is the most commonly used method. As its name suggests, the plastic granules are injected in the barrel surrounded by heating elements. The melted plastic granules are subjected to high pressure to obtain the required shape. After the cooling process, the final product is injected with the help of the injection device. Now, here comes the twist. Plastic bottles are not manufactured in this way. They are made with the combination of two moulding methods i.e. •Injection moulding •Stretch-blow moulding Polyethylene Terephthalate or PET granules are used for the manufacturing process of plastic bottles. They are manufactured by a chemical reaction between terephthalic acid and ethylene glycol. Once the PET granules are manufactured, they are tested heavily for the following properties before beginning the moulding process: •Gloss •Transparency •Thickness •Shatter Resistance •Pressure Resistance •Permeability In the first step of injection moulding, the PET granules are injected in the moulding machines. They are given a small test-tube shape i.e. PET Preforms with the help of PET Preform Injection moulds. These Preforms are then converted into the final bottle in the stretch-blow moulding phase by stretching and applying high pressure. The bottles are tested to ensure they meet the industry standards for quality purpose. Nowadays, PET Preforms are available separately in the market by PET Preforms manufacturers. Any organization can take advantage by using the pre-designed PET Preforms. In this way, they will not be required to follow the two-step moulding process of manufacturing plastic bottles saving both time and money in the due process.