Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
  • B05D3/06—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation
  • B05D3/061—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation using U.V.
  • B05D3/065—After-treatment
  • B05D3/067—Curing or cross-linking the coating
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
  • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
  • B05D3/0254—After-treatment
  • B05D3/0263—After-treatment with IR heaters
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
  • B05D3/06—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D2401/00—Form of the coating product, e.g. solution, water dispersion, powders or the like
  • B05D2401/30—Form of the coating product, e.g. solution, water dispersion, powders or the like the coating being applied in other forms than involving eliminable solvent, diluent or dispersant
  • B05D2401/32—Form of the coating product, e.g. solution, water dispersion, powders or the like the coating being applied in other forms than involving eliminable solvent, diluent or dispersant applied as powders

Definitions

• the invention relates to a method for the plastic coating of a door or door leaf, a door leaf panel or the like, which is provided with a plastic insulating filling within a sheet metal shell to be coated on the outside, with the features of the preamble of claim 1.
• Insulated door or door leaves and, above all, door leaf panels, such as those used for sectional doors or folding gates, are economically manufactured as mass-produced items, be it in mechanical individual construction or as a continuous line, as is common with sectional door panels, which is then available in the individual panel lengths are divided.
• the sheets can be supplied in a certain way pretreated, for example primed or the like, whereupon the insulating layer is supplied, which can be done in such a way that, for example, a polyurethane foam is injected into the cavity of the sheet metal shell formed from the sheets forming the outer skin of the door leaf, or also in such a way that the sheet metal shell is only finished on one side, then filled with the insulating compound and then closed with a cover sheet.
• insulating fillings made of materials other than polyurethane foam are also known, the heat resistance of which is similarly low as that of insulation made from a foamed polyurethane composition.
• an outer surface coating of door or door leaves or door leaf panels or the like that is no longer suitable for mass production is required, for example due to different climatic influences and especially due to different color design or structure, there is a need for a correspondingly individualized surface design. This is not a problem with simple room doors by appropriate painting, but the doors in question from a sheet steel shell with insulating filling are generally intended for purposes in which robust and weather-resistant outer protective layers are required.
• thermoplastic plastic powder is applied to the outer sheet surface to be coated and then melted through the action of heat, crosslinked, sintered on and the like, here briefly heated up to a temperature at which the over the surface of evenly sprinkled or otherwise applied plastic powder melts and, in the sense of the intended plastic coating, comes into intimate, permanent contact with the outer surface of the sheet metal shell.
• Such a plastic coating of sheet metal surfaces is generally known.
• an insulating filling of the type in question is only partially heat-resistant.
• an impairment can already occur at temperatures of over 70 to 80 ° C occur, be it the structure of the adhesive force on the inside of the sheet metal shell, which often contributes to the stability of the door, and the like.
• a substantially higher temperature is required for the above-mentioned coating of a sheet with the aid of a plastic powder which is first sprinkled on and then heated, for example about 180 ° C. depending on the type of plastic powder. It can be a plastic powder based on polyurethane, polyester and the like.
• the scattered fine granules of the powder are melted, and there is an intimate adherence of the melted powder to the surface of the metal shell, so that one can speak of a sintering process. In this way, the desired weatherproof and impact-resistant plastic covering of the door leaf shell is obtained.
• the invention has for its object to find a way to provide a door or door leaf, a door leaf panels or the like with an insulating material filling after completion with a plastic coating, without the lower than the coating temperature heat load of the insulating material filling is exceeded .
• the plastic powder layer applied to the outer surface of the sheet metal shell of the door or door leaf, door leaf panel or the like is heated up to the subsequent border zone of the outer surface of the metal shell so quickly and intensively that the required coating temperature is reached without this temperature being reduced to Insulating filling adjoins the inside of the shell.
• the sheet metal shell acts as a screen, which distributes and radiates or dissipates the heat applied to the outside due to its good thermal conductivity over the sheet metal shell surfaces adjacent to the preferably continuously changing heating zone, so that overall a significantly lower heat gradient is emitted from the inside of the sheet metal shell to the neighboring insulation filling .
• the applied plastic powder layer adheres more or less well to the outer surface of the sheet metal shell to be coated, so that there is a risk that the applied powder will be shaken off when the sheet metal shell is shaken, even if the powder layer is only partially lost leads to impairment of a uniform coating of the outer surface desirable according to weather resistance, color appearance and the like.
• the energy radiation source is therefore removed as far as possible over the outer surface of the sheet metal shell provided with the plastic powder when it is at a standstill moves or at least in such a way that the sheet metal shell moves only extremely quietly, which cannot be achieved in the course of an endless production.
• This movement of the energy radiation source over the resting, to be coated outer surface of the sheet metal shell has a peculiarity in that a movement control of the energy radiation source only affects its holder and does not influence the course of a production line with a continuous movement of the door or gate leaves or panels.
• the heat shielding effect of the sheet material of the sheet metal shell is dependent on the local position of the heating zone that is assumed.
• the heat dissipation capacity is different or greater than in the edge regions thereof.
• This positional dependency of the moving heating zone can be taken into account in various ways, namely by changing the speed and / or distance of the movement of the energy radiation source over the outer surface of the sheet metal shell to be coated, and by controlling the energy radiation intensity, that is, by controlling a movement sequence corresponding to this heat dissipation Heat supply per unit of time in accordance with the respective heat dissipation conditions.
• any suitable energy radiation can be used for the supply of heat.
• Energy radiation carriers that do not require any special protective measures with regard to their effectiveness and / or their environmental impact are preferred.
• Infrared light, ultraviolet light or laser beams are preferably used, which define the heating zone in an appropriate bundling.
• a temperature control possibility in the sense indicated above is also given in the intensity of the bundling or focusing.
• One or more rows of such energy radiation beams are preferably provided, which sweep over the outer surface to be coated.
• Such rows of energy radiation beams can also be provided in opposite directions to one another in order to optimize the coating temperature stability.

Landscapes

• Physics & Mathematics (AREA)
• Engineering & Computer Science (AREA)
• Plasma & Fusion (AREA)
• Laminated Bodies (AREA)
• Application Of Or Painting With Fluid Materials (AREA)
• Liquid Crystal (AREA)
• Specific Sealing Or Ventilating Devices For Doors And Windows (AREA)
• Pinball Game Machines (AREA)
• Refrigerator Housings (AREA)
• Securing Of Glass Panes Or The Like (AREA)
• Special Wing (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (3)

Family

ID=6348175

Family Applications (1)

Country Status (5)

Cited By (4)

Families Citing this family (3)

Family Cites Families (2)

• 1988
  • 1988-02-25 DE DE3805961A patent/DE3805961C2/de not_active Expired - Fee Related
• 1989
  • 1989-02-24 EP EP89103329A patent/EP0330237B1/fr not_active Expired - Lifetime
  • 1989-02-24 AT AT8989103329T patent/ATE105214T1/de not_active IP Right Cessation
  • 1989-02-24 DE DE58907591T patent/DE58907591D1/de not_active Expired - Fee Related
  • 1989-02-24 ES ES89103329T patent/ES2053831T3/es not_active Expired - Lifetime
  • 1989-02-27 DK DK198900928A patent/DK173024B1/da not_active IP Right Cessation

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