Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
  • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
  • B01F27/05—Stirrers
  • B01F27/051—Stirrers characterised by their elements, materials or mechanical properties
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
  • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
  • B01F27/05—Stirrers
  • B01F27/051—Stirrers characterised by their elements, materials or mechanical properties
  • B01F27/053—Stirrers characterised by their elements, materials or mechanical properties characterised by their materials
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
  • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
  • B01F27/05—Stirrers
  • B01F27/07—Stirrers characterised by their mounting on the shaft
  • B01F27/071—Fixing of the stirrer to the shaft
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
  • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
  • B01F27/05—Stirrers
  • B01F27/07—Stirrers characterised by their mounting on the shaft
  • B01F27/072—Stirrers characterised by their mounting on the shaft characterised by the disposition of the stirrers with respect to the rotating axis
  • B01F27/0724—Stirrers characterised by their mounting on the shaft characterised by the disposition of the stirrers with respect to the rotating axis directly mounted on the rotating axis
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
  • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
  • B01F27/05—Stirrers
  • B01F27/051—Stirrers characterised by their elements, materials or mechanical properties
  • B01F27/053—Stirrers characterised by their elements, materials or mechanical properties characterised by their materials
  • B01F27/0531—Stirrers characterised by their elements, materials or mechanical properties characterised by their materials with particular surface characteristics, e.g. coated or rough
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
  • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
  • B01F27/21—Mixers with rotary stirring devices in fixed receptacles; Kneaders characterised by their rotating shafts
  • B01F27/211—Mixers with rotary stirring devices in fixed receptacles; Kneaders characterised by their rotating shafts characterised by the material of the shaft

Definitions

• the present invention is concerned with a mixing shaft for mixing and dividing food products m an aggregate, in particular with a plastic coating on the stainless steel core of the mixing shaft.
• mixing shafts are known in the art from DE 88 04 492.0.
• the well-known mixing shaft has a smooth, round steel core, on the surface of which a casing is applied, which has flattened areas at various points, which serve for the non-rotatable attachment of mixing elements.
• the mixing shafts are usually installed in a heating unit of a continuously producing digester, in which water vapor is introduced into the food products via nozzles, for example processed cheese, soups and sauces.
• the mixing shafts are rotated with revolutions of 300 to 3,000 revolutions per minute in the food product. To ensure optimum condensation of the water vapor on the product particles and thus optimum heating ensure that the product is cut by means of the mixing shaft in order to obtain the largest possible surface area.
• the mixing shafts known in the prior art consist of a stainless steel core, over which a plastic coating is applied by various methods and sealed with sealing rings.
• the structured mixing shaft according to the invention for mixing and dividing food products into an aggregate is characterized in that a steel core with a structured surface is surrounded by a coating, the coating having mixing elements integrated in the coating.
• the method for producing a coating on the surface of a steel core of a mixing shaft for mixing and dividing food products in an aggregate by means of a known processing method for applying PTFE to surfaces is characterized in that on the structured surface of the steel core at isostatic pressure ( p) and elevated temperatures (T) a coating with mixing elements is applied.
• the coating is a so-called PTFE (polytetraethylene) or a ceramic material.
• the steel core is made of stainless steel.
• the elongated cylinder portion of the mixing shaft has at one end a flange with which the mixing shaft is supported on the other working tools of the unit.
• the mixing unit has a product chamber in whose chamber wall advantageously at least one Injetechnischsduse is arranged, is injected through which a water vapor m Trinkwasserqualitatat.
• the plastic coating is pressed isostatically at high pressures of 300 to 350 bar, then sintered at temperatures of 360 ° C to 380 ° C and then machined. After the plastic coating has been applied to the steel core of the mixing shaft, it is advantageous to polish the surface of the plastic coating.
• mixing elements are part of the coating.
• the cylindrical portion of the mixing shaft has elongated grooves and elevations whose corners and edges are rounded, wherein the widths c he grooves and elevations are about the same size.
• FIG. 1 shows a perspective view of the mixing unit (2) of a plant for mixing and dividing food products
• FIG. 2 shows a perspective view of the inventive mixing shaft (1) with its steel core (3) and the plastic coating (6);
• Fig. 3 a section of the surface of the steel core (3).
• Fig. 1 shows a perspective schematic representation of the unit 2, in which the mixing shaft 1 according to the invention is installed.
• the mixing shaft will be described below.
• the mixing shaft 1 has at its one end another working tool 8, on which the entire shaft is supported.
• the steel core 3 has a fastening screw 16, with which the mixing shaft 1 is pressed against the working tool.
• In the walls 10 of the product unit 2 at least one injection nozzle 11 is arranged, are injected with the arbitrary means in the interior of the product unit 2.
• the mixing shaft 1 is driven with revolutions between 300 to 3,000 revolutions per minute.
• the mixing shaft 1 consists essentially of an elongate cylindrical steel core 3, which is surrounded by a plastic coating 6.
• the steel core 3 has a bore 17 in the center, in which a bolt 18 is guided with a thread, not shown here, with which the mixing shaft 1 is pressed with a screw 16 against the working tool.
• the surface of the plastic coating 6 itself is structured and, in the present exemplary embodiment, has radially protruding mixing elements 4 whose distances (A) are different and are distributed over the entire surface circumference of the mixing shaft 1 quasi irregular.
• the coating 6 is in the present embodiment, a so-called PTFE (polytetrafluoroethylene), which is isostatic pressed at a relatively high pressure and sintered at temperatures between 360 ° C and 380 ° C. Because of the different coefficients of expansion of plastic and steel, air gaps are generally formed at the boundary surfaces 20 between the coating and the steel core, in which product residues penetrate and can no longer be removed.
• the surface of the steel core 3 is executed structured.
• the structure of elongated grooves 12 and elongated protrusions 13 is formed over a part of the cylindrical portion of the steel core 3.
• the depth of the grooves is about 2 mm and the widths of the grooves 12 and the elevations are between 6 mm and 10 mm.
• the grooves 12 end shortly before the end face of the cylindrical portion 7 of the mixing shaft 1, whereby an additional slip resistance for the plastic coating 6 is given. Furthermore, it is advantageous for some embodiments to roughen the entire surface, with the exception of the end faces, of the cylindrical portion of the mixing shaft 1, whereby the plastic coating can penetrate into the pores of the roughening.

Landscapes

• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
• Mixers Of The Rotary Stirring Type (AREA)
• Formation And Processing Of Food Products (AREA)
• Accessories For Mixers (AREA)
• Seeds, Soups, And Other Foods (AREA)
• Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (2)

Family

ID=34129481

Family Applications (1)

Country Status (6)

Families Citing this family (7)

Family Cites Families (18)

• 2003
  • 2003-08-02 DE DE10335552A patent/DE10335552B4/de not_active Expired - Fee Related
• 2004
  • 2004-08-02 DE DE502004006334T patent/DE502004006334D1/de not_active Expired - Lifetime
  • 2004-08-02 PL PL04762574T patent/PL1663465T3/pl unknown
  • 2004-08-02 EP EP04762574A patent/EP1663465B1/fr not_active Expired - Lifetime
  • 2004-08-02 WO PCT/DE2004/001729 patent/WO2005014152A2/fr not_active Ceased
  • 2004-08-02 US US10/567,133 patent/US8833688B2/en not_active Expired - Lifetime
  • 2004-08-02 AT AT04762574T patent/ATE387257T1/de not_active IP Right Cessation

Non-Patent Citations (1)

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