Blow molding is a manufacturing process that allows the […]
Blow molding is a manufacturing process that allows the formation of hollow plastic parts. Use air pressure to fill the cavity with soft plastic. Blow molding technology comes from the glass industry, competing with plastic in the disposable and recyclable bottle market. The three main types of blow molding are: extrusion blow molding, injection blow molding and injection stretch blow molding. Blow molding can make containers and bottles, such as Pet bottle mould.
Extrusion Blow molding begins with the parison. According to the shape of the cavity, hot air is blown into a hollow tube (parison) which expands the tube into a hollow portion. Extrusion blow molded parts may include plastic bottles, containers or jars. After the plastic cools, the mold is opened, the blow molded part is ejected and replaced with a new parison to repeat the process.
The cavity mold forms the outer shape of the component and is based on a mandrel that shapes the interior of the parison. The preform is shaped as a bottle or bottleneck with a large number of polymers. This polymer will eventually form the body of the jar. After the preform mold is opened, the mandrel sends the part to the blow molding station. The mandrel to which the part is attached opens at its end and compresses the air into the preform. At this last stop, the plastic parts are blown, cooled and then popped up. This manufacturing method is used in very small containers, including Pet bottle moulds.
Similar to the injection blow molding process, the molten polymer flows into the injection mold cavity on the hot runner module to make a preform. The core pin produces an inner diameter as explained in the injection blow molding process with the core pin forming the interior and the injection cavity forming the exterior of the preform. After injection molding, the part remains on its neck and is rotated 90 degrees. Once the temperature is right, the preform is drawn and blown (blown) into the final shape. When the preform is in its blow mold area, the mold is closed and the stretch rod will stretch the part using two stages of air pressure. After cooling, it will be discharged.
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