![]() ![]() ![]() The Blow Molding Processĭuring the blow molding process, the raw plastic material is shaped into a hollow tube with one open end called a parison. The externally heated molds can be used with polymer that is less sensitive to thermal variations while internally heated hot runner molds allow for better control of material flow.īecause hot runner molding does not require the use of runners, potential waste material is reduced and the recycling and regrind and process of virgin plastic does not impact the total run cycle time. The two main types of hot runner molds are externally heated and internally heated. Hot runner molds use a manifold to heat melted plastic resin and then send the material through a gate to fill the mold cavity. Cold runner systems can be used for a wide variety of polymers and can allow for easy color changes. In 2 plate molds, the runner system and parts are attached, and an ejection system may be used to separate the pair from the mold.The cold runner can reduce waste by recycling and regrinding the material, but this can also increase the total cycle time. Inserts can add strength to a product and eliminate the need for additional parts to reduce the product weight.Ĭold runner molds use a sprue to fill the runners that inject plastic resin into the mold cavity. Insert injection molding inserts a component into the injection mold cavity and plastic material is filled around the insert. Like overmolding, insert molding is an injection moldingprocess that combines two or more components into a single finished product. Overmolds can also be used to seal products with parts made from several injection molds. An example of a TPE overmold application is the handle grips on a toothbrush. A rubber-like compound, called thermoplastic elastomer (TPE), is a commonly used overmold material. Overmolding, or two shot molding, is a process that covers an injection mold over another substance, such as metal, to improve the performance or durability of a product. Unlike thermoset plastics that cool into permanent solid, thermoplastics can be remitted into a liquid after cooling into a solid. Thermoplastic injection molding uses thermoplastic polymer, meaning it changes to a liquid state when heated. There are many types of manufacturing methods categorized under injection molding, such as thermoplastic injection molding, over molding, insert molding, cold runner molding and hot runner molding. ![]() Injection molding is used to manufacture higher volume quantities of plastic products ranging in size from large components to small components requiring micro-precision accuracy. To help you better understand the different manufacturing methods available for your project, we have compiled an overview of the main types of injection and blow molding methods used by plastics manufacturers. Products made through these processes are used in a wide range of industries such as automotive, food service packaging, electronics, medical devices, irrigation, dental, firearms, energy and environmental industries. Injection molding and blow molding are two core processes in plastic manufacturing. The preform is then reheated using an infrared heater and blown into a plastic bottle with forced compressed air. Once the preform cools it is fed into a stretch blow mold machine. Injection stretch blow molding combines the injection molding and blow molding processes.The plastic is first molded into a solid preform, to create a threaded bottle neck. Injection molding is used to manufacture solid components while blow molding is used to make plastic products with hollow areas, such as bottles and containers Each plastic part requires a specific manufacturing process which can be significantly different from one product to another.
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