By heating the steel coating, the sleeves are prestressed radially and axially and can be replaced if necessary.

This technique warrants the absorption of the high injection pressure and prevents the sleeves from becoming loose when working in a high temperature range. The close fitting of the sleeves makes sure that there is no residue of ceramic moulding material in the cylinder when switching from one material to another.

By manufacturing the sleeves separately and due to our special prestressing technique we are able to make every size of cylinder which is currently used in the plastics industry.

1. steel coating; 2, 3, 4 and 5 cemented carbide sleeves; 6 blocking screws; 7 threaded ring