Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F26—DRYING
  • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
  • F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
  • F26B13/10—Arrangements for feeding, heating or supporting materials; Controlling movement, tension or position of materials
  • F26B13/14—Rollers, drums, cylinders; Arrangement of drives, supports, bearings, cleaning
  • F26B13/18—Rollers, drums, cylinders; Arrangement of drives, supports, bearings, cleaning heated or cooled, e.g. from inside, the material being dried on the outside surface by conduction
  • F26B13/183—Arrangements for heating, cooling, condensate removal
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F24—HEATING; RANGES; VENTILATING
  • F24V—COLLECTION, PRODUCTION OR USE OF HEAT NOT OTHERWISE PROVIDED FOR
  • F24V99/00—Subject matter not provided for in other main groups of this subclass
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F26—DRYING
  • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
  • F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
  • F26B13/10—Arrangements for feeding, heating or supporting materials; Controlling movement, tension or position of materials
  • F26B13/105—Drying webs by contact with heated surfaces other than rollers or drums
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F26—DRYING
  • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
  • F26B23/00—Heating arrangements
  • F26B23/04—Heating arrangements using electric heating

Definitions

• the present invention relates to a continuous dryer with permanent magnets, and in particular to a dryer for continuous sheet materials, wherein the drying heat is produced by eddy currents (also named Foucault currents) induced in a plate or a metal drum by a rotating cylinder comprising a plurality of permanent magnets.
• eddy currents also named Foucault currents
• Continuous dryers are known to comprise one or more heating metal surfaces, generally plane or cylindrical, which give heat to the material to be dried, driven on said surfaces.
• the continuous running dryers are particularly used in the textile and paper industries for drying textiles and printed sheets respectively.
• the material to be dried is heated by means of conduction, convection or radiation.
• Each of the three kinds of dryers must be provided with a unit, for instance an electric unit or a steaming unit, which supplies a specific amount of thermal energy suitable for quickly drying, without overheating, the treated material, which is often flammable. Therefore, the known dryers are quite complicated, need a non-stop maintenance and further consume a remarkable amount of energy.
• Object of the present invention is therefore to provide a dryer free from such drawbacks, namely a dryer of simple manufacture wherein the supply of thermal energy to the material to be dried is easily adjustable. Such an object is achieved by a dryer having the characteristics disclosed in claim 1.
• FIG. 1 shows a longitudinal section schematic view of an embodiment of the dryer according to the present invention
• FIG. 1 shows a cross- sectional schematic view of the dryer in Fig. 1;
• - Fig. 3 shows a cross-sectional schematic view of a second embodiment of the dryer according to the present invention
• - Fig. 4 shows a front schematic view of an embodiment of the dryer magnetic cylinder
• Fig. 5 shows a front schematic view of a second embodiment of the diyer magnetic cylinder.
• the dryer comprises a cylinder 1, preferably made of ferromagnetic steel, on whose bases two shafts 2,2 ⁇ rotatably mounted on two roller bearings 3,3', are fastened, coaxially with the cylinder.
• One of the two shafts is keyed to a motor 4 whose rotation speed can be adjusted by known control means (not shown in figure).
• a drum 7 of electroconductive material, preferably aluminium, rotatably mounted on shafts 2,2' by means of a pluraUty of rollers 8. is coaxially arranged on the outside of rotating cylinder 1.
• the inner surface of drum 7 is suitably arranged at a minimum distance from permanent magnets 5 so that the whole drum 7 is immersed, without remarkable dispersions, in the magnetic field produced by magnets 5.
• the material 9 to be dried usually made of a continuous paper sheet, a continuous piece of fabric or another winded material, turns round drum 7 for about a half of its cylindrical development.
• toothing 10 engaged in a toothed wheel I I .
• toothed wheel 1 1 is keyed on the hub of a oleodynamic pump 12 connected in series by an hydraulic circuit 13 to an oil tank 14 and to a throttle valve 15 for the oil flow.
• Said circuit further comprises a safety-valve 16, parallel connected to valve 15, acting to compensate sudden pressure changes, if any, within hydraulic circuit 13.
• valve 15 By opening or closing valve 15 it is thus possible to adjust the braking action of hydraulic circuit 13 on the rotation speed of drum 7 according to the rotation speed of cylinder 1, wherefore such drum warms up owing to the eddy currents induced by the rotating magnetic field produced by the relative rotation of cylinder 1.
• the heating surface comprises, instead of a drum. a plane sheet 7, also preferably made of alumhiium, horizontally arranged in a tangent position with respect to cylinder 1.
• a plane sheet 7 also preferably made of alumhiium, horizontally arranged in a tangent position with respect to cylinder 1.
• This type of dryer is much more simple from a technical viewpoint than the preferred embodiment, but the adjustment of the amount of heat supplied to the material to be dried can be done only by adjusting at the same time the rotation speed of cylinder 1 and the forward speed of such material, wherefore the drying operation is no longer independent from this latter parameter.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Life Sciences & Earth Sciences (AREA)
• Sustainable Development (AREA)
• Drying Of Solid Materials (AREA)
• Water Treatment By Electricity Or Magnetism (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

Family

ID=11374336

Family Applications (1)

Country Status (7)

Cited By (6)

Families Citing this family (4)

Citations (4)

• 1996
  • 1996-05-29 IT IT96MI001079A patent/IT1282752B1/it active IP Right Grant
• 1997
  • 1997-05-28 EP EP97922003A patent/EP0901600A1/en not_active Withdrawn
  • 1997-05-28 CA CA002254764A patent/CA2254764A1/en not_active Abandoned
  • 1997-05-28 WO PCT/IB1997/000644 patent/WO1997045686A1/en not_active Application Discontinuation
  • 1997-05-28 AU AU27863/97A patent/AU2786397A/en not_active Abandoned
  • 1997-05-28 JP JP09541940A patent/JP2000511270A/ja active Pending
• 1998
  • 1998-11-19 NO NO985374A patent/NO985374L/no unknown

Patent Citations (4)

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