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US 2021/0187889 A1Published application
Pressing method and apparatus
AssigneeHarburg-Freudenberger Maschinenbau GmbH
InventorMartin FUHRMANN
Life of this patent
Estimating the term…
Abstract
A pressing apparatus having a strainer cage and at least two feeding screws, which are arranged one behind the other in the feeding direction on a common screw shaft, wherein a pressure zone with no screw helix is arranged between the feeding screws. In the region of the pressure zone, the pressing apparatus according to the invention has a plurality of scraper shells, and these provide for improved efficiency of the pressing operation.
Claims11
A pressing apparatus comprising:
- a pressing chamber delimited by at least one strainer cage;
- at least two feeding screws arranged behind one another on a common screw shaft, each of the feeding screws having a screw helix, wherein a respective pressure zone is arranged between the feeding screws;
- and, in at least one of the pressure zones, at least one scraper shell arranged between cage bars of a cage zone, said scraper shell having at least one extension that projects into the pressing chamber.
A pressing method comprising the steps of:
- feeding a pressing material into a region of a pressure zone using a first feeding screw;
- mixing and/or guiding and/or holding the pressing material in the pressure zone using a plurality of scraper shells;
- and feeding the pressing material onwards in a feeding direction downstream of the pressure zone using a second feeding screw.
Dependencies are inferred from the claim text.