Injection moulding is a manufacturing process for producing parts by injecting molten material into a mould. Injection moulding can be performed with a host of materials mainly including metals (for which the process is called die-casting), glasses, elastomers, confections, and most commonly thermoplastic and thermosetting polymers. 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. After a product is designed, usually by an industrial designer or an engineer, moulds are made by a mould-maker (or toolmaker) from metal, usually either steel or aluminium, and precision-machined to form the features of the desired part. .
In the 12th century, under the Hohenstaufen emperors (1138–1254), German princes increased their influence further south and east into territories inhabited by Slavs; they encouraged German settlement in these areas, called the eastern settlement movement. Members of the Hanseatic League, which included mostly north German cities and towns, prospered in the expansion of trade. In the south, the Greater Ravensburg Trade Corporation served a similar function. The edict of the Golden Bull issued in 1356 by Emperor Charles IV provided the basic constitutional structure of the Empire and codified the election of the emperor by seven prince-electors who ruled some of the most powerful principalities and archbishoprics.