For many years DESMA has been the globally leading manufacturer of special machines for the production of pump stators. Especially for larger stators, machines without clamping unit are used. Up to a length of 10 m, pump stators are produced by using the injection process. For this purpose, special machines are available with one or two injection units which are able to inject alternately more than 300 kg of rubber by way of the multi-shot procedure. Typically vulcanization is then carried out in an autoclave.
DESMA has now developed a special machine particularly for medium-sized stators which makes the production of stators up to a shot weight of 6,890 cm³ possible. The injection unit features a maximum injection pressure of 1,010 bar and has been also designed for multi-shot applications.
As against customary stator machines, the stator is not being arranged along the longitudinal axis of the injection unit, but vertically i. e. 90° up. The main advantage is that far less space is required for the entire plant and the simplified feeding and unloading due to the integrated clamp device. Typically for DESMA, the injection unit works according to the FIFO principle and is equipped with a retractable nozzle.
The new D 969.070 ZU machine is as of now available with the latest visualization DRC 2020 HT which provides the operator with a perfect user surface with tactile feedback due to its Haptik Touch option.
The new D 969.070 ZU thus complements the series of pump stators.
The following machines are available for the production of large-sized pump stators:
These so-called in-line machines are either available with or without clamp and support device.
Small stators as long as 1,000 mm can alternatively be produced on the DESMA standard machines with complete clamping unit. Vulcanization is then carried out under clamping force in the mould carrier.