To prevent that the final product is damaged by an excess amount of silicon or varnish, the automatic brush helps in spreading them evently in the mould.
The bristle brush is set in motion by an engine linked to an inverter and located on a rotative head: it goes down till to rub the mould, than goes up and comes back to the starting position.
From a PLC Siemens S7-300 with a touch screen is possible to command pneumatic cylinder and electromagnetic valves (or an induction motor with the inverter) that guarantee all the brush mouvements.
This machine is largely used in PU companies that produce flet-heeled shoes: in those cases, the automatic brush stands in for the operator perfectly.
Many companies have been using it with our mould varnish spray system.