EP4105377A1 - Bac pour dispositif de repassage - Google Patents

Bac pour dispositif de repassage Download PDF

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Publication number
EP4105377A1
EP4105377A1 EP22179506.5A EP22179506A EP4105377A1 EP 4105377 A1 EP4105377 A1 EP 4105377A1 EP 22179506 A EP22179506 A EP 22179506A EP 4105377 A1 EP4105377 A1 EP 4105377A1
Authority
EP
European Patent Office
Prior art keywords
heat
conducting plate
trough
ironing
blind holes
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP22179506.5A
Other languages
German (de)
English (en)
Inventor
Dominique Lapauw
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Laco Machinery NV
Original Assignee
Laco Machinery NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Laco Machinery NV filed Critical Laco Machinery NV
Publication of EP4105377A1 publication Critical patent/EP4105377A1/fr
Pending legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F67/00—Details of ironing machines provided for in groups D06F61/00, D06F63/00, or D06F65/00
    • D06F67/08—Beds; Heating arrangements therefor
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F65/00—Ironing machines with rollers rotating against curved surfaces
    • D06F65/02—Ironing machines with rollers rotating against curved surfaces with one roller only

Definitions

  • the invention relates to a trough for an ironing device.
  • the invention also relates to an ironing device comprising a trough.
  • the invention also relates to a method for producing a trough.
  • the invention also relates to a method for drying and/or ironing flat material.
  • An industrial ironing machine also referred to here as an ironing device, is often used in industrial laundries and consists of a cylindrical ironing roller and a trough (a heated ironing bed), between which the moist flat material, such as bed linen or table linen, is introduced.
  • the trough and/or the ironing roller are heated to the temperatures required to iron and/or to dry the flat material.
  • the trough usually consists of a heavy steel plate which has to closely adjoin the ironing roller in order to achieve a good ironing result.
  • the trough is heated: this is achieved by welding steam chambers or a steam space onto the trough. By introducing a heating liquid or gas into these steam chambers or steam space, the trough will reach the desired temperatures.
  • the trough is pressed against the ironing roller and the flat material is passed in between. Then, the flat material is ironed and dried while the ironing roller is rotating.
  • Patent application BE1005950 describes an industrial ironing machine consisting of an ironing cylinder and a trough which extends around virtually half of this ironing cylinder.
  • Patent application BE1018329 describes an ironing roller for an ironing device.
  • Patent application BE1018069 describes a feed-in device for an ironing device.
  • the invention comprises a trough for an ironing device, comprising a first heat-conducting plate, wherein the first heat-conducting plate comprises protruding elements and/or recessed elements.
  • the protruding elements and/or recessed elements increase the contact surface between the first heat-conducting plate and the heating liquid or gas, preferably steam, which can flow in the cavity or steam chamber of the trough. This increases the energy efficiency and/or increases the capacity of the ironing device.
  • the invention provides a trough (1) for an ironing device, comprising:
  • a trough (1) for an ironing device comprising:
  • the protruding elements and/or recessed elements (4) are selected from the list of blind holes, wells, fins, depressions, corrugations, cuts and/or projections; preferably blind holes.
  • the first heat-conducting plate (2) has a thickness of at least 10.0 mm to at most 50.0 mm, preferably at least 12.0 mm to at most 40.0 mm, preferably at least 14.0 mm to at most 35.0 mm, preferably at least 16.0 mm to at most 32.0 mm, preferably at least 18.0 mm to at most 30.0 mm, preferably at least 20.0 mm to at most 28.0 mm, preferably at least 24.0 mm to at most 25.0 mm.
  • the height of the protruding elements (4) and/or the depth of the recessed elements (4) with respect to the surface of the first heat-conducting plate (2) facing the cavity (5) is at least 1.0 mm to at most 12.0 mm, is preferably at least 2.0 mm to at most 10.0 mm, is preferably at least 3.0 mm to at most 10.0 mm, is preferably at least 5.0 mm to at most 10.0 mm, is preferably at least 7.0 mm to at most 10.0 mm, is preferably at least 9.0 mm to at most 10.0 mm.
  • the height of the protruding elements (4) and/or the depth of the recessed elements (4) with respect to the surface of the first heat-conducting plate (2) facing the cavity (5) is at least 5.0% to at most 90.0%, preferably at least 10.0% to at most 80.0%, preferably at least 15.0% to at most 70.0%, preferably at least 20.0% to at most 60.0%, preferably at least 25.0% to at most 55.0%, preferably at least 30.0% to at most 50.0%, preferably at least 35.0% to at most 45.0%, of the thickness of the first heat-conducting plate (2).
  • the diameter of the protruding elements (4) and/or recessed elements (4), preferably the blind holes is at least 1.0 mm, preferably at least 2.0 mm, preferably at least 5.0 mm, preferably at least 10.0 mm, preferably at least 15.0 mm, preferably at least 20.0 mm, preferably at least 24.0 mm.
  • the diameter of the protruding elements (4) and/or the recessed elements (4) is at least 5.0% to at most 500.0%, preferably at least 10.0% to at most 400.0%, preferably at least 20.0% to at most 300.0%, preferably at least 30.0% to at most 250.0%, preferably at least 40.0% to at most 200.0%, preferably at least 50.0% to at most 150.0%, preferably at least 60.0% to at most 125.0%, of the thickness of the first heat-conducting plate (2).
  • the protruding elements (4) and/or recessed elements (4) are arranged in a pattern, preferably a repeating pattern.
  • the pattern is made up of rows of protruding elements and/or recessed elements, preferably rows having a repeating distance (X) between two centres of successive elements of at most 100.0 mm, preferably at most 90.0 mm, preferably at most 80.0 mm, preferably at most 70.0 mm, preferably at most 60.0 mm, preferably at most 50.0 mm, preferably at most 45.0 mm, preferably at most 40.0 mm, preferably at most 35.0 mm, preferably at most 30.0 mm.
  • X repeating distance
  • the distance (Y) between the rows in the pattern is at most 100.0 mm, preferably at most 90.0 mm, preferably at most 80.0 mm, preferably at most 70.0 mm, preferably at most 60.0 mm, preferably at most 50.0 mm, preferably at most 45.0 mm, preferably at most 40.0 mm, preferably at most 35.0 mm, preferably at most 30.0 mm.
  • the bottom of the blind hole is flat.
  • the bottom of the blind hole is conical, at least in part. This shape makes it easier to create the blind holes, since these can be created using a drill with a conical point.
  • the blind holes comprise a cylindrical part and a conical part.
  • the bottom of the blind hole is flat. Simulations have shown that a blind hole having only a cylindrical part has a heat transfer that is 5% higher than blind holes of the same depth having a cylindrical part and a conical part.
  • the invention provides a method for producing a trough (1) according to one embodiment described herein, comprising the following steps:
  • the invention provides a method for producing a trough (1) according to one of Claims 1 to 11, comprising the following steps:
  • the invention provides an ironing device comprising a trough (1) according to one embodiment described herein, further comprising a cylindrical ironing roller (9).
  • the cylindrical ironing roller comprises a shell.
  • the trough (1) extends over at least one third of the circumference of the shell of the cylindrical ironing roller, preferably over at least half the circumference of the shell of the cylindrical ironing roller (9).
  • the invention also comprises a method for drying and/or ironing moist flat material, for example bed linen or table linen, using an ironing device as described above, comprising the following steps:
  • a measurable value such as a parameter, a quantity, a time period and so on
  • a measurable value such as a parameter, a quantity, a time period and so on
  • the invention provides a trough (1) for an ironing device, comprising:
  • a trough (1) for an ironing device comprising:
  • the protruding elements and/or recessed elements increase the contact surface between the first heat-conducting plate and the heat transfer medium, preferably steam, which can flow in the cavity of the trough. This increases the energy efficiency and/or increases the capacity of the ironing device.
  • the cavity (5) is a steam chamber.
  • the trough (1) is a steam-heated trough.
  • the first heat-conducting plate (2) is provided with recessed elements (4).
  • the recessed elements ensure local thinning of the first heat-conducting plate. This reduces the thermal resistance of the first heat-conducting plate, as a result of which heat is transferred from the heat transfer medium to the ironing bed more efficiently. This increases the energy efficiency and/or increases the capacity of the ironing device.
  • the protruding elements and/or recessed elements (4) are selected from the list of blind holes, wells, fins, depressions, corrugations, cuts and/or projections; preferably blind holes.
  • the protruding elements and/or recessed elements (4) are blind holes.
  • blind holes refers to holes made in the surface of the first heat-conducting plate, but the holes do not go all the way through the first heat-conducting plate. The depth of the blind holes is therefore less than the thickness of the first heat-conducting plate. It is not possible for any heating liquid or gas to exit the cavity (5) through the blind holes (4).
  • the first heat-conducting plate (2) has a thickness of at least 10.0 mm to at most 50.0 mm, preferably at least 12.0 mm to at most 40.0 mm, preferably at least 14.0 mm to at most 35.0 mm, preferably at least 16.0 mm to at most 32.0 mm, preferably at least 18.0 mm to at most 30.0 mm, preferably at least 20.0 mm to at most 28.0 mm, preferably at least 24.0 mm to at most 25.0 mm.
  • the first heat-conducting plate (2) has a thickness of at least 10.0 mm, preferably at least 12.0 mm, preferably at least 14.0 mm, preferably at least 16.0 mm, preferably at least 18.0 mm, preferably at least 20.0 mm, preferably at least 24.0 mm.
  • the first heat-conducting plate (2) has a thickness of at most 50.0 mm, preferably at most 40.0 mm, preferably at most 35.0 mm, preferably at most 32.0 mm, preferably at most 30.0 mm, preferably at most 28.0 mm, preferably at most 25.0 mm.
  • the second heat-conducting plate (2) has a thickness of at least 1.0 mm to at most 20.0 mm, preferably at least 2.0 mm to at most 18.0 mm, preferably at least 3.0 mm to at most 16.0 mm, preferably at least 4.0 mm to at most 14.0 mm, preferably at least 5.0 mm to at most 12.0 mm, preferably at least 6.0 mm to at most 10.0 mm, preferably at least 7.0 mm to at most 8.0 mm.
  • the second heat-conducting plate (2) has a thickness of at least 1.0 mm, preferably at least 2.0 mm, preferably at least 3.0 mm, preferably at least 4.0 mm, preferably at least 5.0 mm, preferably at least 6.0 mm, preferably at least 7.0 mm.
  • the second heat-conducting plate (2) has a thickness of at most 20.0 mm, preferably at most 18.0 mm, preferably at most 16.0 mm, preferably at most 14.0 mm, preferably at most 12.0 mm, preferably at most 10.0 mm, preferably at most 8.0 mm.
  • the thickness of the second heat-conducting plate (2) is at most 90.0%, preferably at most 80.0%, preferably at most 70.0%, preferably at most 60.0%, preferably at most 55.0%, preferably at most 50.0%, preferably at most 45.0%, of the thickness of the first heat-conducting plate.
  • the height of the protruding elements (4) and/or the depth of the recessed elements (4) with respect to the surface of the first heat-conducting plate (2) facing the cavity (5) is at least 1.0 mm to at most 12.0 mm, is preferably at least 2.0 mm to at most 10.0 mm, is preferably at least 3.0 mm to at most 10.0 mm, is preferably at least 5.0 mm to at most 10.0 mm, is preferably at least 7.0 mm to at most 10.0 mm, is preferably at least 9.0 mm to at most 10.0 mm.
  • the height of the protruding elements (4) and/or the depth of the recessed elements (4) with respect to the surface of the first heat-conducting plate facing the cavity is at least 1.0 mm, is preferably at least 2.0 mm, is preferably at least 3.0 mm, is preferably at least 5.0 mm, is preferably at least 7.0 mm, is preferably at least 9.0 mm, is preferably at least 10.0 mm.
  • the height of the protruding elements (4) and/or the depth of the recessed elements (4) with respect to the surface of the first heat-conducting plate facing the cavity is at most 15.0 mm, is preferably at most 12.0 mm, is preferably at most 10.0 mm, is preferably at most 8.0 mm, is preferably at most 6.0 mm, is preferably at most 5.0 mm.
  • the height of the protruding elements (4) and/or the depth of the recessed elements (4) with respect to the surface of the first heat-conducting plate (2) facing the cavity (5) is at least 5.0% to at most 90.0%, preferably at least 10.0% to at most 80.0%, preferably at least 15.0% to at most 70.0%, preferably at least 20.0% to at most 60.0%, preferably at least 25.0% to at most 55.0%, preferably at least 30.0% to at most 50.0%, preferably at least 35.0% to at most 45.0%, of the thickness of the first heat-conducting plate (2).
  • the height of the protruding elements (4) and/or the depth of the recessed elements (4) with respect to the surface of the first heat-conducting plate facing the cavity is at least 5.0%, preferably at least 10.0%, preferably at least 15.0%, preferably at least 20.0%, preferably at least 25.0%, preferably at least 30.0%, preferably at least 35.0%, of the thickness of the first heat-conducting plate.
  • the height of the protruding elements (4) and/or the depth of the recessed elements (4) with respect to the surface of the first heat-conducting plate facing the cavity is at most 90.0%, preferably at most 80.0%, preferably at most 70.0%, preferably at most 60.0%, preferably at most 55.0%, preferably at most 50.0%, preferably at most 45.0%, of the thickness of the first heat-conducting plate.
  • the diameter of the protruding elements (4) and/or recessed elements (4), preferably the blind holes is at least 1.0 mm, preferably at least 2.0 mm, preferably at least 5.0 mm, preferably at least 10.0 mm, preferably at least 15.0 mm, preferably at least 20.0 mm, preferably at least 24.0 mm.
  • the diameter of the protruding elements (4) and/or recessed elements (4), preferably the blind holes is at least 1.0 mm to at most 50.0 mm, preferably at least 2.0 mm to at most 40.0 mm, preferably at least 5.0 mm to at most 35.0 mm, preferably at least 10.0 mm to at most 50.0 mm, preferably at least 15.0 mm to at most 30.0 mm, preferably at least 20.0 mm to at most 27.0 mm, preferably at least 24.0 mm to at most 25.0 mm.
  • the diameter of the protruding elements and/or recessed elements (4), preferably the blind holes is at most 50.0 mm, preferably at most 40.0 mm, preferably at most 35.0 mm, preferably at most 30.0 mm, preferably at most 25.0 mm, preferably at most 20.0 mm, preferably at most 15.0 mm.
  • the diameter of the protruding elements (4) and/or the recessed elements (4) is at least 5.0% to at most 500.0%, preferably at least 10.0% to at most 400.0%, preferably at least 20.0% to at most 300.0%, preferably at least 30.0% to at most 250.0%, preferably at least 40.0% to at most 200.0%, preferably at least 50.0% to at most 150.0%, preferably at least 60.0% to at most 125.0%, of the thickness of the first heat-conducting plate (2).
  • the diameter of the protruding elements and/or the recessed elements (4) is at least 5.0%, preferably at least 10.0%, preferably at least 20.0%, preferably at least 30.0%, preferably at least 40.0%, preferably at least 50.0%, preferably at least 60.0%, of the thickness of the first heat-conducting plate.
  • the diameter of the protruding elements and/or the recessed elements (4) is at most 500.0%, preferably at most 400.0%, preferably at most 300.0%, preferably at most 250.0%, preferably at most 200.0%, preferably at most 150.0%, preferably at most 125.0%, of the thickness of the first heat-conducting plate.
  • the protruding elements (4) and/or recessed elements (4) are arranged in a pattern, preferably a repeating pattern.
  • the pattern is made up of rows of protruding elements and/or recessed elements (4), preferably rows having a repeating distance (X) between two centres of successive elements of at most 100.0 mm, preferably at most 90.0 mm, preferably at most 80.0 mm, preferably at most 70.0 mm, preferably at most 60.0 mm, preferably at most 50.0 mm, preferably at most 45.0 mm, preferably at most 40.0 mm, preferably at most 35.0 mm, preferably at most 30.0 mm.
  • X repeating distance
  • the pattern is made up of rows of protruding elements and/or recessed elements (4), preferably rows having a repeating distance (X) between two centres of successive elements of at least 5.0 mm, preferably at least 10.0 mm, preferably at least 20.0 mm, preferably at least 30.0 mm, preferably at least 35.0 mm, preferably at least 40.0 mm, preferably at least 45.0 mm, preferably at least 50.0 mm.
  • X repeating distance
  • the pattern is made up of rows of protruding elements and/or recessed elements (4), preferably rows having a repeating distance (X) between two centres of successive elements of at least 5.0 mm to at most 100.0 mm, preferably at least 10.0 mm to at most 90.0 mm, preferably at least 20.0 mm to at most 80.0 mm, preferably at least 30.0 mm to at most 70.0 mm, preferably at least 35.0 mm to at most 60.0 mm, preferably at least 40.0 mm to at most 55.0 mm, preferably at least 45.0 mm to at most 50.0 mm.
  • X repeating distance
  • the distance (Y) between the rows in the pattern is at most 100.0 mm, preferably at most 90.0 mm, preferably at most 80.0 mm, preferably at most 70.0 mm, preferably at most 60.0 mm, preferably at most 50.0 mm, preferably at most 45.0 mm, preferably at most 40.0 mm, preferably at most 35.0 mm, preferably at most 30.0 mm.
  • the distance (Y) between the rows in the pattern is at least 5.0 mm, preferably at least 10.0 mm, preferably at least 20.0 mm, preferably at least 30.0 mm, preferably at least 35.0 mm, preferably at least 40.0 mm, preferably at least 45.0 mm, preferably at least 50.0 mm.
  • the distance (Y) between the rows in the pattern is at least 5.0 mm to at most 100.0 mm, preferably at least 10.0 mm to at most 90.0 mm, preferably at least 20.0 mm to at most 80.0 mm, preferably at least 30.0 mm to at most 70.0 mm, preferably at least 35.0 mm to at most 60.0 mm, preferably at least 40.0 mm to at most 55.0 mm, preferably at least 45.0 mm to at most 50.0 mm.
  • the bottom of the blind hole is conical, at least in part.
  • the blind holes comprise a cylindrical part and a conical part.
  • ironing device comprises industrial ironing machines. These comprise a trough (1) and an ironing roller (9), in between which the flat material is introduced.
  • the term "trough” comprises the ironing bed for an ironing device (1).
  • This ironing bed is usually heated.
  • the trough (1) can be pressed against the ironing roller (9) by means of mechanical, hydraulic, pneumatic or electrical pressure. This makes it possible to achieve an optimum evaporation effect of the moisture in the flat material. This also makes it possible to achieve an optimum ironing effect of the flat material. This also makes it possible to achieve an optimum conveying effect of the flat material between the ironing roller (9), which usually rotates, and the trough (1).
  • the trough (1) comprises several perforations distributed over the surface, or a part of the surface, of the trough (1).
  • the perforations in the trough (1) may form any desired pattern.
  • the perforations in the trough (1) form a regular pattern. More preferably, the perforations in the trough (1) form a triangular, rectangular or rhombic pattern over the surface, or a part of the surface, of the trough (1).
  • the first heat-conducting plate and/or the second heat-conducting plate comprises non-alloy steel.
  • the first heat-conducting plate and/or the second heat-conducting plate consists of steel having the following composition:
  • the invention comprises a trough (1) for an ironing device, comprising:
  • weld spot comprises the common contact surface between two plates (2, 3) which are coupled to one another by a welding technique, wherein the contact surface is local.
  • Such weld spots (6) are usually round. In one embodiment of the invention, such weld spots (6) are distributed evenly over the entire surface of the plates (2, 3), as a result of which the cavity (5) between two plates (2, 3) comprises chambers, such as those in a padded cushion.
  • Such weld spots (6) can be formed by means of a laser-welding technique, as known in the prior art.
  • weld seam comprises the common contact surface between two plates (2, 3) which are coupled to one another by a welding technique, wherein the contact surface is continuous in one dimension.
  • a weld seam (7) is usually applied along the circumference of the two plates (2, 3), thus closing the cavity (5) between the two plates (2, 3).
  • Such weld seams (7) can also be made parallel to one another, as a result of which the cavity (5) between two plates (2, 3) comprises elongate chambers.
  • Such weld seams (7) can be formed by means of a laser-welding technique, as known in the prior art.
  • the trough (1) comprises a weld seam (7) running along the circumference of the plates (2, 3) and the trough (1) comprises weld spots (6) which are situated at equal distances from one another over the surface of the trough (1), preferably as a padded cushion.
  • the weld spots (6) may form any desired pattern.
  • the weld spots (6) form a regular pattern. More preferably, the weld spots (6) form a triangular, rectangular or rhombic pattern on the surface of the plates (2, 3).
  • flow passages for the heating liquid or the heating gas are created.
  • ironing roller comprises the cylindrical ironing roller (9) for an ironing device (1).
  • This ironing roller (9) comprises a shell, which shell comprises a diameter and a circumference (2).
  • ironing path comprises the contact distance between the trough (1) and the shell of the ironing roller (9).
  • free drying length comprises the distance over which the shell of the ironing roller (9) is not surrounded by the trough (1).
  • the sum of the ironing path (3) and the free drying length (4) corresponds to the circumference (2) of the shell of the ironing roller (9).
  • flat material comprises any kind of fabric which can be introduced into an ironing device (1) in order to be dried and/or ironed.
  • the flat material has a minimum width of 1.0 m.
  • the flat material has a maximum width of 3.3 m.
  • this flat material comprises bed linen or table linen.
  • bed linen comprises sheets, fitted sheets, drawsheets, bedspreads, duvet covers and pillow cases.
  • table linen comprises tablecloths and napkins.
  • the invention comprises a trough (1) as described above, in which the heat-conducting plates (2, 3) comprise flexible metal.
  • the heat-conducting plates (2, 3) comprise steel, preferably stainless steel.
  • the invention comprises a trough (1) as described above, in which the trough (1) has a diameter of between 200 mm and 2000 mm, for example a diameter of 300 mm, 500 mm, 600 mm, 800 mm, 900 mm, 1200 mm, or 1600 mm.
  • the term "diameter of a trough” comprises the diameter of the arc which the trough (1) describes. This diameter corresponds approximately to the diameter of a cylindrical ironing roller (9) which fits inside the trough (1).
  • the diameter of the trough (1) will determine the drying and ironing path (3) of the flat material in the ironing device (1). The larger the diameter of the trough (1), the longer this ironing path (3) can be.
  • the invention provides a method for producing a trough (1) according to one embodiment described herein, comprising the following steps:
  • the invention provides a method for producing a trough (1) according to one of Claims 1 to 11, comprising the following steps:
  • the steps of the method as described above are carried out in the above-mentioned order.
  • the above-mentioned steps are carried out in a different order.
  • both plates (2, 3) are first deformed and only then welded.
  • the plates (2, 3) are initially pressed against one another and are then connected to one another by weld spots (6) and/or weld seams (7).
  • a gas or a liquid will preferably be injected at high pressure.
  • this liquid or gas comprises water or steam.
  • this liquid or gas is injected between the plates (2, 3) at a pressure of approximately 30 bar. In this way, flow passages for the heating liquid or the heating gas are created between the weld spots (6) and/or weld seams (7). Due to the very small cavity (5), the circulation of the heating liquid or the heating gas is not associated with the same problems which are inherent to conventional steam chambers.
  • the invention comprises a method for producing a trough (1) as described above, in which the maximum cavity (5) between the plates (2, 3) has a thickness of between 1 mm and 7 mm.
  • the invention comprises a trough (1) as described above, in which the maximum cavity (5) between the plates (2, 3) has a thickness of between 1 mm and 7 mm.
  • the maximum cavity (5) between the plates (2, 3) has a thickness of between 2 mm and 4 mm, more preferably the maximum cavity (5) between the plates (2, 3) has a thickness of approximately 3 mm.
  • This cavity (5) depends on the thickness of the plates (2, 3), the distance between the weld spots (6) and/or weld seams (7) and the quantity of heating liquid or heating gas which has to flow between the plates (2, 3) in order to keep the plates (2, 3) at the desired temperature.
  • the invention provides an ironing device comprising a trough (1) according to one embodiment described herein, further comprising a cylindrical ironing roller (9).
  • the cylindrical ironing roller comprises a shell.
  • the trough (1) extends over at least one third of the circumference of the shell of the cylindrical ironing roller, preferably over at least half the circumference of the shell of the cylindrical ironing roller (9).
  • the trough (1) extends over at least three quarters, preferably over at least four fifths, more preferably over at least 90%, most preferably over at least 95% of the circumference (2) of the shell of the cylindrical ironing roller (9).
  • the length of the ironing path (3) corresponds to this percentage of the circumference (2) of the shell of the ironing roller (9).
  • the degree to which the trough (1) surrounds the ironing roller (9) can also be described using a contact angle, in which a contact angle of 0° corresponds to no contact between the trough (1) and the ironing roller (9), and a contact angle of 360° corresponds to complete enclosure of the shell of the ironing roller (9) by the trough (1).
  • the contact angle is between 120° and 330°, for example 130°, 140°, 150°, 160°, 170°, 180°, 190°, 200°, 210°, 220°, 230°, 240°, 250°, 260°, 270°, 280°, 290°, 300°, 310° or 320°.
  • the contact angle is at least 150°, more preferably at least 180°, more preferably at least 210°, more preferably at least 240°, more preferably at least 270°, more preferably at least 300°.
  • the free drying distance is reduced to a minimum.
  • the invention comprises an ironing device (1) as described above, characterized in that the shell of the cylindrical ironing roller (9) comprises a layer of moisture-absorbing material (23) around the shell of the cylindrical ironing roller (9).
  • moisture-absorbing material comprises any material which can absorb moisture from the flat material during ironing.
  • the moisture-absorbing material (23) is felt, for example felt of 4000 g/m 2 .
  • the moisture-absorbing material (23) is coupled to the shell of the cylindrical ironing roller (9) by means of springs (24).
  • the moisture-absorbing material (23) is pressed against the trough (1) and/or the flat material.
  • This moisture-absorbing material (23) has to be able to dry to a sufficient degree, hence the need for a free drying length (4) which is increased in the invention to the complete circumference (2) of the shell of the ironing roller (9).
  • the springs (24) also ensure that uneven patches are pressed away.
  • the springs (24) also ensure that an air cushion is created between the moisture-absorbing material (23) and the ironing roller (9).
  • the invention comprises an ironing device (1) as described above, in which the trough (1) is flexible and is pressed against the shell of the cylindrical ironing roller (9).
  • This has the advantage that, independent of the thickness of the flat material, the flat material will always be pressed tightly against the shell of the ironing roller (9) and against the trough (1).
  • This may be effected by mechanical, hydraulic, pneumatic or electrical means.
  • the invention also comprises a method for drying and/or ironing moist flat material, for example bed linen or table linen, using an ironing device as described above, comprising the following steps:
  • the flat material is introduced in a moist state.
  • the trough (1) is pressed against the ironing roller (9), which may, for example, be effected by hydraulic, pneumatic or electrical means.
  • the heated liquid or the heated gas serves as heating liquid or heating gas.
  • This heating liquid or this heating gas can be selected from the list comprising: steam, thermal oil and hot air. Preferably, this is steam or thermal oil.
  • the heating liquid or the heating gas can be heated by means of a gas boiler or a thermal boiler.
  • the trough (1) is heated to a temperature of at least 100°C, more preferably to a temperature of at least 150°C, most preferably to a temperature of at least 170°C.
  • the invention comprises a method for drying and/or ironing moist flat material as described above, in which the heat of the excess moisture is partly recovered in order to heat up the trough (1).
  • the heat can be recovered by means of a heat exchanger.
  • a first heat-conducting plate has a length of 2500 mm, a width of 995 mm and a thickness of 20 mm, and is made of steel.
  • the first heat-conducting plate is curved such that the plate forms a part of the shell of a cylinder.
  • the hollow side can function as part of the ironing bed, and a second heat-conducting plate which is also curved is welded to the convex side of the first heat-conducting plate, such that a cavity through which steam can flow at a pressure of between 7 and 12 bar is created between the first heat-conducting plate and the second heat-conducting plate.
  • the heat transfer of the first heat-conducting plate to the linen that is located on the hollow side of the first heat-conducting plate during ironing was simulated using ANSYS 2020 R1. In this case, the curve of the first heat-conducting plate was ignored because it has no or barely any effect on the heat transfer.
  • the temperature T steam on the convex side (the steam side) of the first heat-conducting plate was considered to be 187.96°C (which corresponds to steam at approximately 12 bar).
  • the thermal resistance of the first heat-conducting plate will decrease because the contact surface between the steam and the first heat-conducting plate increases and the thickness of the plate decreases locally. If a constant temperature difference is applied over the plate, the heat transfer rate will only depend on the thermal resistance R, which is itself dependent on the geometry of the heat-conducting plate. Consequently, the relative increase of the heat transfer rate of the first heat-conducting plate with blind holes with respect to the first heat-conducting plate without blind holes is independent of the selected T linen , see equation (2).
  • the heat transfer rate of the trough to the linen should be calculated when the inlet temperature of the washed linen is 21°C and the temperature of the linen after ironing is 165°C.
  • a heat transfer rate is the sum of the latent heat for evaporating the water in the linen, the heat required for heating the water in the linen from 21 to 100°C and the heat required for heating the linen itself from 21 to 165°C, which gives a heat transfer rate of 166.2 kW.
  • the average T linen can then be calculated, which is 106°C for the heat-conducting plate without blind holes, which is logically between the inlet temperature (21°C) and the outlet temperature (165°C).
  • the convex side of the first heat-conducting plate is possibly provided with blind holes.
  • the blind holes have a diameter of 13 mm and a depth of 6 mm.
  • the blind holes are arranged in rows along the length direction of the first heat-conducting plate, having the distance X between the centres of two successive blind holes, and having the distance Y between two successive rows (distance between the axes), as indicated in Figure 7 .
  • No blind holes were provided over a distance of 50 mm from the edges of the first heat-conducting plate.
  • the blind holes are considered to be cylinders in the simulations.
  • Table 1 illustrates various values of X and Y that were used in the 3D heat transfer simulations. The results of the simulations are reported in Figure 4a and Figure 4b.
  • Figure 4a illustrates the relative improvement in the heat transfer with respect to a first heat-conducting plate without blind holes, for various combinations of X and Y.
  • Figure 4b illustrates the average temperature of the linen for various combinations of X and Y. It follows from the results that the smaller the distance between the blind holes, the higher the heat transfer rate and the higher the average linen temperature. However, an excessive number of blind holes has an adverse effect on the mechanical strength of the first heat-conducting plate.
  • FIG. 5a illustrates the relative improvement in the heat transfer with respect to a first heat-conducting plate without blind holes, for various diameters of the blind holes (13 to 24 mm).
  • Figure 5b illustrates the average temperature of the linen for various diameters of the blind holes (13 to 24 mm). It follows from the results that the larger the diameter of the blind holes, the higher the heat transfer rate and the higher the average linen temperature. However, excessively large blind holes have an adverse effect on the mechanical strength of the first heat-conducting plate.
  • the depth of the blind holes has the greatest influence on the heat transfer rate, and it is therefore recommended to use a depth of at least 10 mm.
  • the average linen temperature for the optimized first heat-conducting plate mentioned herein would be 129°C, which is 23°C hotter than for a first heat-conducting plate having a thickness of 20 mm without blind holes. This would correspond to an at least 10% increase in the capacity of the ironing device.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Heat Treatment Of Articles (AREA)
  • Cookers (AREA)
EP22179506.5A 2021-06-17 2022-06-17 Bac pour dispositif de repassage Pending EP4105377A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE20215472A BE1028891B1 (nl) 2021-06-17 2021-06-17 Kuip voor strijkinrichting

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EP4105377A1 true EP4105377A1 (fr) 2022-12-21

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB225699A (en) * 1923-11-26 1924-12-11 Eustace Alexander Alliott Improvements in or relating to ironing and pressing machines
BE1005950A3 (nl) 1992-06-05 1994-03-15 Lapauw Romain Industriele strijkmachine en de werkwijze ter vervaardiging van een kuip in een dergelijke strijkmachine te gebruiken.
BE1018069A3 (nl) 2008-03-28 2010-04-06 Lapauw Dominique Inrichting voor het invoeren, strijken en vouwen van vlakgoed.
BE1018329A5 (nl) 2008-10-31 2010-09-07 Lapauw Nv Strijkrol en een strijkinrichting voorzien van een dergelijke strijkrol.
EP2628847A1 (fr) * 2012-02-17 2013-08-21 Laco Machinery NV Cuvette de repassage pour machine à repasser
US20170121901A1 (en) * 2014-04-07 2017-05-04 Werkhuizen Lapauw Nv Ironer chest for an ironing device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB225699A (en) * 1923-11-26 1924-12-11 Eustace Alexander Alliott Improvements in or relating to ironing and pressing machines
BE1005950A3 (nl) 1992-06-05 1994-03-15 Lapauw Romain Industriele strijkmachine en de werkwijze ter vervaardiging van een kuip in een dergelijke strijkmachine te gebruiken.
BE1018069A3 (nl) 2008-03-28 2010-04-06 Lapauw Dominique Inrichting voor het invoeren, strijken en vouwen van vlakgoed.
BE1018329A5 (nl) 2008-10-31 2010-09-07 Lapauw Nv Strijkrol en een strijkinrichting voorzien van een dergelijke strijkrol.
EP2628847A1 (fr) * 2012-02-17 2013-08-21 Laco Machinery NV Cuvette de repassage pour machine à repasser
US20170121901A1 (en) * 2014-04-07 2017-05-04 Werkhuizen Lapauw Nv Ironer chest for an ironing device

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