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Endless moulding thanks to Exjection


The Exjection process, which combines extrusion and injection moulding, is now able to run as a continuous process. The innovative technique, developed by IB Steiner of Austria for injection moulding machinery, was previously limited to producing profiles up to 3m in length.
Injection moulding machinery companies Engel and Arburg first demonstrated the Exjection process on their machines in 2007 and 2008 respectively. SaarGummi of Germany, the first customer to try the continuous Exjection method, used an Arburg Allrounder 570 S machine for the process last year. SaarGummi has since been taken over by Chongging Light Industry & Textile Holding of China.
IB Steiner says the continuous Exjection process uses an "endless mould", which has a modular design in the formative cavity. Developed with Z-Werkzeugbau of Austria, the mould's individual segments have a defined length and the mould is sealed all round. This allows the cooled sections of the moulded part to be removed at one end while the mould is being filled at the other.
After demoulding, the now-empty modular elements of the cavity are conveyed back to the other end of the mould, where new melt is being injected.
Arburg says the process can either be linear, with a circulating chain of mould elements, or rotary, with the aid of a rotary table. Two injection units, working in alternation on a conventional multi-component Allrounder machine, supply the melt to the cavity.
Arburg's Selogica system is used to control the process. Hasco of Germany supplies the hot runner system used in the process.


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