This is an excerpt from Lesson #1 in Paulson's Extrusion Blow Molding Technology training progam. This lesson is titled "The Process and the Equipment".You. Blow molding (or moulding) is a manufacturing process for forming and joining together hollow plastic parts. It is also used for forming glass bottles or other hollow shapes. In general, there are three main types of blow molding: extrusion blow molding, injection blow molding, and injection stretch blow molding. The blow molding process begins with melting down the plastic and forming it into a parison or, in the case of injection and injection stretch blow molding (ISB), a preform. The parison is a. Injection blow molding (IBM) is similar to extrusion blow molding, except that the parison is formed by an injection molding process around a core rod or metal shank as shown in position 1 in the schematic in Fig. The parison consists of a fully formed bottle/jar neck with a thick tube of polymer attached, which will form the body of the bottle. The parison/core rod is transferred into the blow molding part of the part of the machine at position 2 in Fig. AT this point the preform is inflated and cooled. When cool enough the formed bottle rotates and the mold opens at position 3 an. The use of structural ribs, welds between walls, arcs or steps can create a structure that helps reduce warpage. As in lbow cavity, the plastic begins to stretch to fit the mold contour. Examples parts made by the EBM process: most polyethylene hollow products, milk bottles, shampoo bottles, automotive ducting, watering blow moulding bitesize guide, and hollow industrial parts such as drums. Wikimedia Commons. Overall the shrinkage of the blow moulding bitesize guide will match the shrinkage of the exterior. Interior Surface Mold Core — Design The interior surface of double-wall blow molded parts is normally formed by a mold tuide. From Wikipedia, the free encyclopedia.

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Vacuum formers can be used for making moulds and housings for electronic products. High impact polystyrene HIPS is often the material used in a vacuum former, as it heats up quickly depending on thickness. The process is as follows:. Sometimes talc can be dusted on the former so that it drops out of the mould with ease. A good vacuum-formed mould will only be possible if a good former has first been made.

Since polymers have a relatively low melting point, they can be shaped easily once molten by either injection moulding or extrusion. Injection moulding is used in industry to produce most mass-produced polymer parts using the following process:.

Extrusion works in a very similar way to injection moulding:. Common extruded polymer products are plastic pipes, tubes and guttering. Blow moulding is used to shape plastics, eg bottles, plastic barrels and similar shapes.

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