EXTRUSION BLOW MOULDING
Extrusion Blow Molding is one of several blow molding methods to produce plastic bottles, jars, and jugs. It is a common blow molding technology used to process many different plastics, including HDPE, PVC, PC, PP, and PETG.
Extrusion Blow Molding is the simplest type of blow molding. A hot tube of plastic material, called a parison, is dropped from an extruder and captured in a water cooled mold. Once the molds are closed, air is injected through the top or the neck of the container. When the hot plastic material is blown up and touches the walls of the mold the material "freezes" and the container now maintains its rigid shape.
For colored bottles, colorants are often fed into the extruder at a controlled rate and mixed with the resin as they are being melted.
Injection moulding is used to make a wide range of plastic products, from enclosures to model construction kits, chairs and toys.
Injection moulding is a manufacturing process for producing parts by injecting molten material into a mould. Material for the part is fed into a heated barrel, mixed (using a helical shaped screw), and injected (forced) into a mould cavity, where it cools and hardens to the configuration of the cavity.
The process is very repeatable. That is, the second part you produce is going to be practically identical to the first one etc. This is a wonderful characteristic when trying to produce brand consistency and part reliability in high volume production.