Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
  • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
  • B05B12/16—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling the spray area
  • B05B12/20—Masking elements, i.e. elements defining uncoated areas on an object to be coated

Definitions

• the invention relates to a masking agent according to the preamble of claim 1 and to a coating process (Irreenn ,, iinnssbbeessoonnddeerree painting or preservation method) carried out with such a masking agent.
• a cathodic dip coating (KTL) is first applied to the body shell as a corrosion protection layer, which e.g. is baked in a dryer at temperatures up to 220 degrees Celsius. Only then does the primed body go into the actual painting process, in which a filler is first applied to compensate for the surface and as stone chip protection. This is followed by a base coat for coloring and effects, and finally a clear coat to protect against external influences.
• KTL cathodic dip coating
• the window panes (windshield, rear window, fixed side windows) are usually robot-controlled in large-scale production at the installation site and glued (direct glazing).
• the window adhesive is first applied in a bead-like manner all around the edge area of the window pane before this area is brought into contact with the body flange (window flange) at the installation opening and pressed on.
• the structural connection between the window and the body serves both for stabilization in the sense of a torsionally rigid body and for power transmission in the event of a crash.
• this process also requires a corresponding masking of the body flange after passing through the KTL painting in order to keep away the paint layers applied in the subsequent painting steps in this area.
• the masking ensures perfect adhesion of the window adhesive to the KTL-coated flange.
• a method for bonding windows in which the body flange is coated with an adhesive tape or with an organic mass, such as e.g. a PVC pastisol, is masked.
• the plastisol is e.g. gelled by means of IR emitters or in a PVC oven, achieving a firm consistency.
• the flange masking is usually manually removed and disposed of, and direct glazing is carried out on the KTL-coated flange.
• Both the plastisol and the adhesive tape are not recyclable, which means that process waste must be disposed of to a considerable extent.
• the object of the present invention is to provide a further improved masking agent of this type, which can be produced particularly cost-effectively and is easy to handle in a wide variety of application situations.
• the execution of the masking agent as an extruded plastic profile brings considerable cost savings compared to an injection molded part.
• the provision of the masking agent as a quasi-endless profile is conducive to widespread use, because the masking agent can be adapted to the most varied — even rare — application situations in the simplest manner by suitable cutting to length.
• the cross section of the plastic profile is essentially circular, elliptical, oval or obliquely oval and is designed as a corrugated plastic tube with first sections of greater stiffness and low elongation which alternate in the longitudinal direction and second sections of low stiffness and greater stretchability.
• Plastic profiles in O-shape are known, for example, as so-called “electrical hoses” from other areas of technology and are usually produced using the process of rotary extrusion. Basically, there is an established manufacturing technology for this masking agent and commercially available manufacturing systems. This considerably facilitates the practical introduction within the cost framework given by the cost pressure in the mass production of passenger cars.
• a masking agent of this type is so highly flexible (assuming a suitable choice of material and dimensioning) that the requirements the window flange masking in the car paintwork can be fully complied with.
• an additional retaining clip is provided on the corresponding body section to increase the pressure of the masking profile, in particular plastic corrugated pipe.
• a retaining clip has a section with an internal cross section adapted to the outer shape of the masking profile and a sufficiently large opening which allows it to be pushed laterally onto the masking profile in its state in which it is attached to the body section.
• a handling section is also provided for easy gripping of the holding clip.
• an embodiment may also be expedient in which the cuts mentioned are not provided in the same sections or, if appropriate, no cuts at all over longer profile sections. If, in fact, a control of the profile production takes place in adaptation to a specific body shape, the intended curvature areas of the profile can be designed differently in this respect than profile sections, which should cover straight, elongated edge areas.
• This version with the mentioned profile tabs (which could also be considered as a kind of fish scales) is particularly useful in connection with a profile version alternative to the above-mentioned "plastic corrugated pipe", in which the plastic profile is essentially U-shaped in cross-section, in particular with unevenly long legs. none of the "U” has.
• the plastic profile has the cross-section the shape of an oblique "U” with a cavity widening towards the base of the "U” for elastically adhering attachment to edge areas with different material thicknesses.
• the aforementioned U-profile is suitable in a single design for practically all applications in the field of car painting, but also for other possible applications with different sheet densities, such as in the painting of household appliances or industrial plants.
• a design of the plastic profile is suitable for the above-mentioned, from today's point of view, applications in which the cavity has a maximum width in the range between 3 and 12 mm and the continuous slot has a minimum free width of less than 1 mm, in particular of 0.2 mm or less, for elastically adhering to an edge area, in particular body or housing flange, with a minimum material thickness of approximately 0.5 mm and a maximum material thickness in the range between 2.5 and 6 mm (depending on the profile construction ) Has.
• a highly temperature-resistant plastic which keeps the essential functional properties of the masking agent at least 175 ° C for at least 25 min and then at least 155 ° C for at least 75 min.
• reinforcement by fillers with a proportion between 0.1% and 40% is expedient.
• a thermoplastic elastomer or polyamide plastics such as polysulfone or poly (aryl ether) ketone are also suitable, as can be found in A. Frank, Kunststoffkompentium, Vogel ausbuch, fourth edition 1996.
• glass fibers in particular are considered as the reinforcing material, but also carbon and plastic fibers for special applications.
• an embodiment of the masking agent with a substantial proportion, in particular of more than 75% and more particularly of 90%, of recycled plastic material is preferred.
• an essentially closed material cycle can be established for the production of such equipment, and there are practically no disposal problems.
• the proposed novel masking agent can not only be used in painting or preservation processes in vehicle or appliance construction (especially in the manufacture of household appliances or consumer electronics). Rather, its use is also sensibly possible in other applications in the context of liquid or powder spraying processes in which edge or opening areas of a product component - in particular, but not exclusively, of a housing part - are to be protected against precipitation of the medium to be applied in each case. In principle, it can therefore also be used advantageously in vacuum coating processes, in particular in high-vacuum vapor deposition processes or sputtering processes.
• FIGS. 1A to IC front views of slightly modified designs of the masking agent according to FIGS. 1A to IC, the latter also in an installation situation on a car boot lid,
• 3A and 3B are sketch-like representations of a holding clip suitable for use with a masking agent according to FIGS. 1A to 2B, in a perspective representation or representation of an installation situation,
• FIG. 4 shows a series of schematic cross-sectional representations of a masking agent according to a further embodiment in different states, in which it encompasses metal sheets of different thicknesses, and
• 5A to 5C are side views from both sides (FIGS. 3A and 3C) and a plan view of a masking means of the type shown in FIG. 2, which is bent at one end into a very small radius.
• the plastic corrugated pipe consists of integrally molded, alternately arranged first rings 7A with a larger diameter and second rings 7B with a smaller diameter (which may have a smaller wall thickness and thus greater flexibility than the first rings 7A).
• the outer diameter of the first rings 7A is between 16 and 20 mm, that of the smaller diameter rings may be between 9 and 13 mm and the wall thickness is approximately 0.5 mm.
• the longitudinal slot 3 has a width of approx. 0.1 to 0.2 mm and the V-shaped boundaries of the threading area. 7 form an angle of approximately 60 to 75 ° with one another.
• FIGS. 2A and 2B show front views and profile cross sections of modified plastic corrugated pipes 1 'and 1 ", respectively.
• the threading area (not specifically designated here) is softly rounded and relatively flat, and the profile shape overall, the flattening is somewhat flattened compared to a circular cross section.
• the outer contour is approximately circular in cross section and the threading area is embodied in a more pronounced, distinct V-shape.
• 2C shows the plastic corrugated pipe 1 ′′ in the state placed on the edge region of a car rear cover 8.
• FIGS. 3A and 3B show a retaining clip 9 as an additional element of a masking system using a plastic corrugated tube in one of the embodiments described above, in order to increase its retaining force on the body or housing section to be covered.
• the holding clip 9 has an approximately eyeglass-like basic shape with a first approximately circular section 9a, which acts as an engagement and holding section with respect to a plastic corrugated pipe, and a second approximately circular (but completely closed) section 9b, which is used as a handling section when the holding clip is placed on a corrugated pipe or when pulling away from it.
• the two sections 9a and 9b are connected to one another by a web 9c.
• the opening 9d in the engagement and holding section 9a is matched to the outer cross section of the corrugated plastic pipe in such a way that the holding clip can be pushed laterally over it relatively easily, but on the other hand it also reliably prevents falling off or unintentional stripping.
• the figures also show that in the embodiment shown here, the circular cross section of the engagement and holding section 9a is smaller, but its width is larger than that of the handling section 9b.
• 4 to 5C show an alternative embodiment of a masking profile to the plastic corrugated pipe 1, namely an extruded sealing lip profile 11. In FIG.
• this profile could be called "obliquely U-shaped" in cross-sectional shape, since From a base 13, an upwardly tapering first leg 15 and a second leg 17 extend in an asymmetrically inclined manner. Both legs 15, 17 each have at their outermost end an outward processing area 15a, 17a.
• this design is excellently suitable for securely fixing the sealing lip profile 11 to sheets of very different thicknesses, with a fog-proof covering of the sheet's surface located near the edge (left in the figure) of the sheet 15 ,
• the sealing lip profile 11 is divided into individual lamellae or "scales” by cuts arranged at an angle to the longitudinal axis and largely penetrating its height, which are connected to one another only on a relatively narrow, strip-shaped profile section , 5A and 5C show, seen from the longer or shorter leg 15 or 17, how these slats spread out against one another when the profile 11 is bent in a narrow radius.
• the longer profile leg 15 also provides very good coverage of an underlying strip-shaped area (flange) in this extreme position of the profile 11, as can occur, for example, in the "corners" of a window flange.
• Both masking profiles 1 and 11 of the first and second embodiments described above have, as essential common features, a longitudinal slot which widens towards the interior of the profile into a cavity.
• the walls of the slot are clamped against one another like a clamp as a result of its expansion to the cavity through the profile wall, so that the respective profile is automatically held by frictional force on a flange or other sheet metal strip onto which it is pushed.
• Both versions also have in common that the slot widens slightly towards the periphery of the profile, which makes it easier to attach to edges to be covered.
• the implementation of the invention is not limited to these examples, but is also possible in a variety of modifications that are within the scope of professional action. In particular, modifications of the shape of the two masking profiles shown can be regarded as being within the scope of the invention in a wide variation range.

Landscapes

• Details Or Accessories Of Spraying Plant Or Apparatus (AREA)
• Application Of Or Painting With Fluid Materials (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=32404113

Family Applications (1)

Country Status (8)

Families Citing this family (6)

Family Cites Families (11)

• 2002
  • 2002-12-20 DE DE10260215A patent/DE10260215A1/de not_active Withdrawn
• 2003
  • 2003-12-22 WO PCT/EP2003/014742 patent/WO2004056491A1/fr not_active Ceased
  • 2003-12-22 EP EP03782473A patent/EP1572376B1/fr not_active Expired - Lifetime
  • 2003-12-22 US US10/539,460 patent/US20060068108A1/en not_active Abandoned
  • 2003-12-22 PL PL03375867A patent/PL375867A1/xx not_active Application Discontinuation
  • 2003-12-22 MX MXPA05006665A patent/MXPA05006665A/es unknown
  • 2003-12-22 AU AU2003290112A patent/AU2003290112A1/en not_active Abandoned
  • 2003-12-22 AT AT03782473T patent/ATE344702T1/de not_active IP Right Cessation
  • 2003-12-22 DE DE50305654T patent/DE50305654D1/de not_active Expired - Lifetime

Non-Patent Citations (1)

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