Auger – a piece of equipment, conducting molding plastics. He is one of the key elements to ensure the operation of such apparatus. Its function in the molding of plastic is really important: it takes the source material melts it and submits the form. Screw on its design features must exactly match the characteristics of a substance used in injection molding. Its geometry, the presence of additional elements and other parameters are determined by the properties of polymers, as the temperature of transition from one state to another (melting and solidification), temperature stability and so on.
What is particularly important in molding compounds plastic? Firstly, this temperature regime, where the polymer can be processed, ie, to cast plastic. The wider the figure, the easier it runs the process of working with substance. In particular, if the polymer has range of more than 50 degrees, the plastic molding is uncomplicated. If this parameter is below 30 degrees, the polymer is recognized trudnopererabatyvaemym. If in the plastic molding material is heated more allowable limit, then decomposes (or thermal destruction). It loses its original properties and can not be used in molding plastics.
Therefore, it is important that in injection molding equipment was accurate setting, especially if you use materials with low processability. In such cases, the auger is equipped with special channels, that fed cooling fluid. With their help you can provide and additional heating if necessary. In injection molding is also very important, exactly how the polymer changes its physical state – gradually or abruptly. This is reflected in the design of the screw, since such differences feed substance and its mastication occur in different ways. Smooth transition is characteristic of polysulfone, polycarbonate, polystyrene and its copolymers. The abrupt transition – a measure of the substances used in molding plastic, such as polyamides, polypropylene and other polymers.