Classifications

• • C—CHEMISTRY; METALLURGY
  • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
  • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
  • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
  • C25D11/02—Anodisation
  • C25D11/04—Anodisation of aluminium or alloys based thereon
• • C—CHEMISTRY; METALLURGY
  • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
  • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
  • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
  • C25D11/02—Anodisation
  • C25D11/04—Anodisation of aluminium or alloys based thereon
  • C25D11/16—Pretreatment, e.g. desmutting
• • C—CHEMISTRY; METALLURGY
  • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
  • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
  • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
  • C25D11/02—Anodisation
  • C25D11/04—Anodisation of aluminium or alloys based thereon
  • C25D11/18—After-treatment, e.g. pore-sealing
• • 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
  • D06F75/00—Hand irons
  • D06F75/38—Sole plates

Definitions

• Aluminum part, aluminum part and soleplate made of aluminum
• the present invention relates to a method for coating an aluminum surface of an aluminum part, in particular for an aluminum soleplate of a steam iron, the surface of which is intended to be placed on the objects to be ironed, made of anodized aluminum and / or provided with a layer of anodized aluminum.
• soleplates are made of metal, wherein the intended for laying on the objects to be ironed surface is polished. It has been thought that the best way to achieve a high ironing quality is to use a sole whose surface has as few as possible roughnesses so as to achieve good heat transfer between the sole and the fabrics to be ironed and simultaneously reduce the coefficient of friction, which improves the "sliding" of the iron on the fabrics.
• the present invention has the object to overcome the known from the prior art disadvantage.
• Method for coating an aluminum surface of an aluminum part, in particular an iron sole, the surface of which is provided to slide over the fabrics to be ironed during ironing characterized in that it comprises the following steps: a) applying a graphics of baked enamel (20) a part of an aluminum surface (1 1) of the sole,
• the surface of the aluminum part treated by the method according to the invention is advantageously more durable, so that it is no longer necessary when applying the raised graphics of baked enamel (as is customary in the prior art) to apply a primer made of stoving enamel on the entire surface beforehand, which simplifies manufacturing and reduces costs.
• the raised enamel graphics allow the contact surface of the sole with the fabrics to be ironed to be reduced and thus also the coefficient of friction, which advantageously simplifies the ironing and improves the quality of the ironing.
• the raised baked enamel graphics enhance the distribution of the vapor between the sole and the fabric, and generally reduce the contact of the aluminum surface with respect to each contact during application of that surface.
• the baked enamel graphic is applied to the aluminum surface of the aluminum part by serigraphy and / or pad printing and / or lithography and / or decalcomania. These techniques make it possible to produce baked enamel graphics with a very precise and precise course, that is, without edges that could interfere with the sliding of the sole.
• the aluminum part is fired in an industrial furnace at temperatures of 450 ° C to 650 ° C, preferably from 500 ° C to 600 ° C for a period of 10 minutes, especially for a period of less than 15 minutes.
• a layer of anodized aluminum having a thickness of 5 microns to 40 microns, more preferably 10 microns to 30 microns is obtained.
• the anodization step is a hard anodizing to achieve a surface hardness of the aluminum having values of 750 to 950 according to Vickers, in particular from 800 to 900. Particularly good results have been obtained in embodiments in which the hardness of the soleplate under the baked enamel graph, when measured with a Vickers tip to which a force of 0.3 daN is applied, is preferably between 750 and 950, while the raised Preferably, the baked enamel finish may have a hardness of about 1,000.
• the surface is polished to make it shine, preferably with a rag or the like. If the baked enamel graphic is to stand out in color, for example, for design purposes, good results have been achieved with baked enamel graphics with color pigments.
• the color pigments are selected from the group of silicate paints which consist of two components and are therefore called two-component silicate paints or pure silicate paints.
• One of the components is the so-called binder, which consists of liquid potassium silicate glass.
• the other component consists of pigments and fillers. The two components are brought together just before processing and mixed together.
• the silicate paints thus have only a limited processing and storage time.
• silicate paints which are not very viscous (thixotropic) and which are heat-resistant (temperature-stable).
• a particularly good adhesion of the enamel finish graphics on the anodized aluminum soleplates could be achieved with color pigments of a silicate color, in which the silicon components were replaced by aluminum.
• the silicates in which this is the case are called aluminosilicates. If aluminum (Al 3+ , rather than Si 4+ ) is incorporated into the network of minerals, only the charge balance achieved by incorporation of further positively charged ions (cations) has to be taken into account, with the ratio between Al: Si not exceeding may be 1
• the graphics of baked enamel is designed so that it becomes narrower towards the tip of the soleplate. This also advantageously reduces the coefficient of friction, in particular in the longitudinal direction of the soleplate, that is, in which the sole must be moved predominantly, so as to obtain a better ironing quality.
• the baked enamel graphics are furthermore preferably produced by vitrifying a composition of baked enamel particles. This vitrification or sintering effects rounding of the edges of the graphic and smoothing the surface of this graphic, which also promotes gliding (depending on the design of the graphic).
• the soleplate according to the invention in particular for a steam iron whose surface is made of anodized aluminum for laying on the objects to be ironed and / or provided with a layer of anodized aluminum, is characterized in that on a part of the aluminum surface of a raised graphic Baking paint is applied.
• the present invention is applied to any aluminum part in which the wear and friction resistance is to be improved, such as in an iron sole, but it is also applied to heating elements such as radiators, or in cooking pots or heat-resistant containers , or even on the upper surfaces of gas hobs, which are made of stainless steel today, which is why the invention surprisingly improves the state of the art of aluminum parts, in particular of soleplates.
• Figure 2 shows the soleplate of Figure 1 in section, taken along the line AA, which has been coated with a method according to a first embodiment of the invention.
• Figure 3 shows the soleplate of Figure 1 in section, taken along the line A-A, which has been coated with a method according to another embodiment of the invention.
• FIG. 1 shows schematically the surface 1 1 of an iron sole 10 of a steam iron 1, which is provided with steam outlet openings 13.
• At least the surface 1 1 of the sole 10, which is intended to come into contact with the substances to be ironed, consists for example of laminated aluminum, which is subsequently electrolytically oxidized. After a short time in the air, a thin natural oxide layer is formed as a result of the high affinity of aluminum for oxygen. This process is completed only after a few months and the resulting oxide layer is so thick that no oxygen diffusion takes place. The layer has reached at this time a thickness of about 0.05 ⁇ and is no longer thicker. However, this small layer thickness does not provide adequate protection.
• the aluminum is protected on the surface 1 1 by anodic oxidation in an electrolyte by a thick layer of aluminum oxide, which is called in the German-speaking area ELOXAL (Electrolytically Oxidized Aluminum).
• ELOXAL Electrically Oxidized Aluminum
• the anodized coating not only gives excellent corrosion protection, but also a visually pleasing appearance, with the ability to color the aluminum surface in a variety of shades.
• hard-anodizing is meant, in particular, a process for electrolytic oxidation of an aluminum material, for producing a protective layer on the aluminum material using a cooled electrolyte, in particular, acid.
• the electrolyte used is preferably sulfuric acid, in particular 10 to 15 percent sulfuric acid.
• the electric voltage is preferably gradually increased, starting from 10 V up to 100 V.
• the electrolyte is preferably cooled to a temperature below 5 ° C, preferably below 3 ° C, and most preferably to about 0 ° C.
• the thickness of the protective layer is at least 5 ⁇ m. In particular, the thickness is at least 10 ⁇ , preferably at least 20 ⁇ , and particularly preferably at least 30 ⁇ . In particular, the thickness of the protective layer is greater than the thickness of a layer of natural alumina which forms particularly on any aluminum part exposed to ambient air.
• thickness of the protective layer is meant, in particular, the shortest distance between a surface of the aluminum base and a surface of the protective layer facing the aluminum base. This makes it possible to provide a surface of a soleplate with particularly advantageous mechanical, chemical and thermal properties.
• the protective layer has a Vickers microhardness of at least 700 HV 25.
• the microhardness according to Vickers is in particular at least 800 HV 25 and more preferably at least 900 HV 25.
• a carrier for a cooking product with a particularly high mechanical resistance can be provided.
• a raised graph of baked enamel 20 is applied to the aluminum surface 11 of the soleplate 10, which for example becomes narrower in the direction of the tip 12 of the soleplate 10 and which may preferably contain color pigments of a silicate color preferably the silicon components have been replaced by aluminum, which simplifies the burning of the enamel 20 with the aluminum 1 1; this is primarily to increase the variety of design options.
• the raised graph of baked enamel 20 has rounded edges 21.
• the baked enamel 20 graphic was preferably applied to the surface 1 1 by means of serigraphy and / or pad printing and / or lithography and / or decalcomania, starting from a composition of baked enamel particles, and baked with it in an oven, preferably an industrial oven at temperatures of 550 ° C to 600 ° C for a time of at least 15 minutes.
• the individual lines of the graph of baked enamel 20 may have a thickness of 10 to 100 ⁇ .
• the width of the individual lines of the baked enamel graphic 20 can be between a few hundredths of a millimeter and a few millimeters.
• the baked enamel graphic may also include smaller cross sections of the surface of the stoving enamel (as exemplified in the region of the tip 12).
• the soleplates 10 according to the invention can be produced as follows:
• a graphic of baked enamel 20 is applied by means of serigraphy and / or pad printing in one or more steps with the aid of one or more printing stencils (in particular in the case of multicolored graphics).
• This layer of baked enamel paint is optionally dried and baked in an industrial furnace at temperatures of 550 ° C to 600 ° C, followed by a waiting time of at least 15 minutes with the aluminum surface 1 1 of the soleplate 10.
• the particles of the stoving enamel are vitrified , Sintering rounds off the edges 21 of the baked enamel graphic and smoothing of the surface, which compensates for all acute angles and irregularities.
• the surface After curing the stoving lacquer, the surface is fed to an operation for anodizing, preferably for hard anodizing.
• anodizing preferably for hard anodizing.
• a better adhesion of the enamel and a higher hardness of the aluminum is achieved.
• the concrete design is not limited, the friction coefficient per unit area between the surface 1 1 of the sole 10 and the materials to be ironed (not shown) can be lowered so that the ironing is simplified and the quality of the Bügeins is improved.
• the baked enamel 20 image on the surface 11 of the sole 10 can significantly reduce the contact area between the sole 10 and the fabric to be ironed.
• the "sliding" of the sole 10 is considerably improved, without resulting in unaesthetic wear of the graphic 20, as is the case in the prior art.
• a graphics of baked enamel 20 according to the invention finally causes a distance of a few tenths of micrometers between the surface 1 1 and the sole 10, in which the steam outlet openings 13 can open, so that advantageously formed by the graph 20 channels for the distribution of the vapor, which improves the effect of the steam on the surface of the fabrics.
• the present invention surprisingly improves the state of the art of soleplates 10, in which at least the surface 1 1 consists of anodized aluminum. LIST OF REFERENCE NUMBERS

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Electrochemistry (AREA)
• Materials Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Textile Engineering (AREA)
• Irons (AREA)

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• 2011
  • 2011-04-08 ES ES201130556A patent/ES2390028B1/es not_active Expired - Fee Related
• 2012
  • 2012-04-02 EP EP12718752.4A patent/EP2694720A1/de not_active Withdrawn
  • 2012-04-02 WO PCT/IB2012/051597 patent/WO2012137124A1/de active Application Filing

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