Keeping time with the machine
Sealing solutions for industrial presses and injection molding machines
Strong forces with moderate movements, extremely variable forward and return stroke speeds, extremely short strokes at a high number of cycles, in some cases under a continual load or with fast load changes – the operating conditions for seals in hydraulic cylinders for industrial presses and injection molding machines are diverse and always challenging. This requires technical excellence. The highest level of reliability is in demand. So are stick-slip-free performance and low operating costs.
Patented pressure relief
One ingenious solution from Freudenberg Sealing Technologies is the Merkel Omegat primary seal with its patented pressure- relief function. Rapid forward strokes in combination with slow return strokes can build up considerable pressure in the cylinder and lead to a failure of the sealing system due to extrusion. In these cases, small borehole in the primary seal facilitates the return flow of fluid into the working chamber. This creates a pressure balance – small borehole, great effect!
PTFE counters poor lubrication
Another example of Freudenberg Sealing Technologies' application know-how is the specially developed PTFE compound C104. Short strokes and high cycle counts produce deficient lubrication in the sealing system. The counterfaces beneath it can suffer. The costly consequences: the replacement of the seals and the guides, along with the rework of the housing and cylinder rods. Due to its outstanding anti-friction properties, this PTFE compound developed by Freudenberg Sealing Technologies behaves neutrally on the counterface even with poor lubrication. Thanks to its patented geometry, the matching Merkel Guivex guide ring promotes the moistening of the contact surface with lubricant.
