Frame for flat sifter and process for producing the same
AssigneeBuhler AG
InventorsChristoph Keller, Marc Bachmann
Life of this patent
Estimating the term…
Abstract
The invention relates to a sieve frame for plan sifters and also to a method of producing it. It is used mainly in plan sifters for milling. The object is to improve the functionality of an insertable sieve frame and to simplify production. This object is achieved in that the sieve frame (1) including battens (2) is foamed from polyurethane in one part (and one operation), the sieve cloth (4) also being surrounded by foaming and the sieve frame (1) preferably containing a metal core (3)
Claims22
A sifter comprising:
- a sifter box having sidewalls and a floor;
- a sifter frame configured to be inserted into the sifter box, said sifter frame including
- a mesh having edge regions;
- and
- a plurality of peripheral frame elements defining an area, the peripheral frame elements being formed from a plastic material,
- wherein the edge regions only of the mesh are bonded onto the peripheral frame elements with a foam plastic to thereby secure the mesh to the frame elements.
A sifter frame for use with a flat sifter box, the sifter frame comprising:
- plastic peripheral frame elements defining an area;
- at least one plastic dividing frame element disposed in said area between said peripheral frame elements so as to divide said area into at least two sections;
- a filter screen having edge regions only bonded with a foam plastic to said peripheral frame elements and said dividing frame element forming one of the sections;
- and
- a sifter box having sidewalls and a floor,
- wherein the sifter frame is configured to be inserted into the sifter box.
A method of making a sifter frame for use with a flat sifter box, the method comprising:
- providing a mold configured to form peripheral frame elements defining an area and at least one dividing frame element disposed in said area between said peripheral frame elements to divide the area into at least two sections;
- positioning a reinforcing skeleton in the mold;
- positioning a filter screen having edge regions in the mold at a distance from the reinforcing skeleton;
- filling the mold with a plastic to form said peripheral frame elements and the at least one dividing frame element such that only the edge regions of the filter screen are bonded to the peripheral frame elements and the dividing frame element forming one of the sections using a foam plastic,
- wherein the sifter box has sidewalls and a floor and the sifter frame is configured to be inserted into the sifter box.
A sifter, comprising:
- a sifter box having sidewalls and a floor;
- and
- a sifter frame configured to be inserted into the sifter box, said sifter frame including
- peripheral frame elements defining an area;
- at least one dividing frame element disposed in said area between said peripheral frame elements so as to divide said area into at least two sections;
- and
- a filter screen having edge regions only secured to said peripheral frame elements and said dividing frame element forming one of the sections,
- wherein the peripheral frame elements and the dividing frame element are made by filling a mold with plastic, the filter screen being positioned with respect to the mold such that the edge regions only of the filter screen are secured to the peripheral frame elements and dividing frame element by the filled plastic.
Dependencies are inferred from the claim text.