The ESERVO pressing cylinder contains our latest proprietary technology inside and has a proven performance track record.

• Saves up to 85% energy costs
• Heavy duty and direct performance gear system eliminating weak ball spindle
• Less maintenance and no hydraulic oil changes
• Superior process repeatability and accuracy
• Stepless and smooth adjustable 20 tons pressing force
• No emission hazard (fire), as only little oil is used
• Lifetime substantially longer compared to hydraulic cylinders

Conventional mold closing and locking is empowered by a pneumatic driven cylinder in which both movement and force are not controlable. High compressed air consumption, extensive wear and tear of mold-edges, oil vapor pollution and limited cycle speed form the downsides of this older technology. Our new generation main closer is driven by a strong and energie efficient servo motor in combination with a connecting rod generating following benefits:

• Extension of lifetime through controlled and smooth movement during the mold closing and locking.
• Saving up to 80 m³/h of compressed air based on standardized 5 bar operating pressure and double gob system
• Closing speed up to 0,1 sec driving higher production speeds
• Superior process repeatability and accuracy

Conventional pushers are driven by a pneumatic cylinder with a horizontal and vertical stroke. A lot of compressed air is consumed and movements are not controlable.

The ESERVO pusher from WALTEC operates using two servo motors, each one being independently responsible for either horizontal or vertical movement:

• Saving up to 10 m³/h compressed air
• All movements 100% controllable when pushing product into annealing lehr
• Superior repeatability and accuracy
• Less glass scratches and damaged products due to seamless and smooth touching
• Less maintenance needed due to absence of pneumatic valves

Conventional pressing cylinders operate based on traditional hydraulics running at a constant speed and in a constant sense of rotation. This older technology needs a lot of energy throughout the whole year. The whole system requires expensive continuous maintenance, oil filtering and care. Due to it’s design, the three-phase motor delivers full performance all the time, although this would only be necessary during pressing. Valve indexing times and limited dynamics reduce the available process times and thus the production speed.

WALTEC innovated this process with great success: the first servo hydraulic press cylinder features outstanding benefits:

• 80% less electrical energy consumption
• 20% higher output
• Only 30 litres of hydraulic oil are needed
• Achieve higher production speed (cut per minute) whilst getting extended pressing time

For 12 years WALTEC has been using gearless, electric direct drives for the manufacture of glass machines with much success.

Due to this reason we have used the direct drive as standard table drive for all high-performance press machines since 2010.

The special design developed by WALTEC (among other things the segmented coils) offers an extremely high operating reliability.

WALTEC manufactures these direct drives, as one of their core competences, in-house.

• High torques up to 70.000 Nm
• Table indexing times up to 0,25 seconds
• Smooth movement: free from backlash and jolt
• Online drive supervision and low maintenance