| Special features | |
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| The range of screw types offered includes designsfor the production of cables from typical thermoplastics such as PE, HDPE, PP,TPU, PA, PVC, Sioplas, Silan, FRNC- materials such as Megolon and special types for high output applications. | |
| The screws are nitrided or for grooved-bush extruders feature coated flights of the feed section or entire processing unit, depending on the requirements. A special powder coating alloy with outstanding tenacity and wear-resistance was developed in-house for the coating of screw flights. Included in the broad range of screws avialable for Dunst extruders are types from Hastelloy for the processing of fluoro polymers and other corrosive thermoplastics. | |
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| Development | |
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High-grade thermoplastics require top quality processing equipment. Our teams of specialists are constantly engaged in the development of new screw configurations capable of coping with the numerous novel raw materials which come on the market. A kit system is used for the efficient testing of of new developments. The ideal geometry is found by variation of the flight depths, compression ratios and gap widths of the barrier, shear and mixing sections of the screw. Optimisation of the processing performance is carried out under real production conditions and the optimised geometry is then transposed to other machine sizes by computer-assisted upscaling and downscaling. |
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| The gears are designed to enable the screw to be removed towards the rear of the extruder against the direction of the extrusion. This option makes screw removable possible without moving downstream equipment. Innovative manufacturing techniques and sophisticated logistics make possible delivery times down at the absolut minimum. Included in the service for our customers is the inhouse optimisation of raw material formulations in the laboratories. | |
