The screens are changed when the system is idle in the case of ESD and ETS screen changers. For this purpose the screen support piston is hydraulically extended and the screen package is then renewed. In the case of ESD screen changers, material may emerge at the piston ends in the region of the gaps (leakages), especially in the case of low viscous melts.

In case of the ETS screen-changer (ECON Thermo Sealer) these gaps which are filled with material are sealed at the piston ends by means of cooling air coming from a blower. In this way no plastic melt can emerge from these gaps during production. In order to allow the screen support piston to extend hydraulically in this model, the gaps at the piston ends must be brought to process temperature again for changing the screen.

Optimal flow channels and a special perforated supporting plate protect the material despite rapid processing.
On request we will be happy to arrange a visit to one of our customers, additionally a test run with your material in ECON’s technical centre is also possible.