Patent Number: 6,253,672

Title: Hydraulic platen press

Abstract: A press has a fixed platen, a movable platen displaceable toward and away from the fixed platen, a plurality of low-pressure cylinders braced against the movable platen and pressurizable to move it toward the fixed platen, and a plurality of medium-pressure cylinders braced against the movable platen and pressurizable to move it toward the fixed platen. A low-pressure accumulator holding a body of hydraulic fluid and a head of nitrogen and a medium-pressure accumulator holding a body of hydraulic fluid and a head of nitrogen are connected via respective conduits with the low- and medium-pressure cylinders. a nitrogen supply connects the accumulators above the respective fluid bodies together in a closed system. A controller feeds the fluid therefrom to the respective cylinders. More particularly, the nitrogen supply includes a shunt conduit extending between upper regions of the accumulators and a pump or compressor in the shunt conduit for displacing nitrogen from the low-pressure accumulator to the high-pressure accumulator.

Inventors: Rauf; Heinrich (Willich, DE), Sondermann; Gotz (Kempen, DE)

Assignee: G. Siempelkamp GmbH & Co.

International Classification: B30B 15/24 (20060101); B30B 15/16 (20060101); B30B 1/00 (20060101); B30B 1/34 (20060101); B27N 3/20 (20060101); B27N 3/08 (20060101); B30B 001/34 ()

Expiration Date: 07/03/2018