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What is Extrusion Blow Molding?

Blow molding is a manufacturing process that is used to create hollow plastic parts by inflating a heated plastic tube until it fills a mold and forms the desired shape. Extrusion blow molding uses an extruder as a rotating screw to force the molten plastic through a die head that forms around a blow pin. The molten plastic is raw materials that have been heated from small pellets or granules, and then formed into a hollow tube referred to as the parison.  Pressurized air flows through the blow pin to inflate the parison, forming the bottle. This is the most common type of blow molding and is used to manufacture large quantities of relatively simple parts.

The parison is then clamped between two mold halves and inflated by pressurized air until it conforms to the inner shape of the mold cavity. Typical pressures are 25 to 150 psi, far less than for injection molding. Lastly, after the part has cooled, the mold halves are separated and the part is ejected.
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Parts made from blow molding are plastic, hollow, and thin-walled, such as bottles and containers that are available in a variety of shapes and sizes. These bottles are used for various purposes including small bottles, plastic tubes, water bottles, and toiletry items.  It can be used for larger items as well.  For further information or to review your blow mold needs please feel free to contact us directly at cheryl@blowmold.com or through our website.
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