Extrusion blow molding pdf file

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Hydroforming. A metal-specific molding process called hydroforming employs water pressure to push metal into a dye or mold. The metal is enclosed inside the mold or dye machine after being heated to a malleable but not molten state. High hydraulic pressure water may be pushed in via a small opening. The metal is forced to fill the geometry of CORPORATE TRAINING AND PLANNING 5 •Blow pin is inserted through the open end of the parison to form a neck. •Finally air is introduced through the blow pin to inflate the parison inside the mould. •By this, the molten Polymer copies the details of the Mould. •Lastly the moulded product is cooled & ejected. •In the finishing stage, the part undergoes, fBlow molding process; general steps y Melting the resin- done in extruder y Form the molten resin into a cylinder or tube (this tube is called parison) y The parison is placed inside a mold, and inflated so that the plastic is pushed outward against the cavity wall y The part is allowed to cool in the mold and is then ejected y The part is trimmed injection blow molding or extrusion blow molding is right for your needs. At E2Global we can help determine which process is best suited for your application. With our extensive experience manufacturing a variety of bottles, tubes, and other consumables, we are here to help guide you with your packaging need from design to production. As the blow phase is taking place, the blown air also contributes to the parison's cooling, forming the part. Initially, extrusion blow molding was a process that only produced bottles, such as milk jugs or shampoo bottles. Within the past decade though, extrusion blow molding has been used in order to improve products and By careful matching of the plastication unit, extrusion pressure and hydraulic resistance of the blow head, backflow of the melt into the plastication barrel can be avoided without an interposed valve system. Plastication Systems In extrusion blow moulding machines the following plastication systems (arranged in order of importance) are used: