A PET preform is a test tube shaped piece of plastic that is made by a process called injection moulding, using a plastic called PET. Meanwhile a mould is a shaped hollow piece of metal, a tool, that is used to control the shape of the item being moulded. The PET preform, better known as preform, is accomplished through a molding process. The fused PET injected into a mold become a preform, which, by an additional processing step (blowing), takes the form of bottles for beverages for elementary, oil or detergents use. A preform is made by a "finish" (bottleneck), which will not change in the blowing process. "Finish" diameter and thread type are the main features of the preform, features that determine the kind of screw bottle cap and the use of the bottle (for still water, sparkling water, oil, milk). On the other hand, the tubular structure, will form the bottle in the blowing and molding processes and it determines the basis weights of the final product; diameter, length and shape are the key elements that give the main features to the blown container. The PET polymer, used for the production of preforms doesn't have a colour, it's almost transparent, but once mixed with colouring additives, it can have different shades of colour according to customer requirements.
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