EP0897758B1 - Process for applying powder paint, especially control powder, on surfaces of car body parts to be ground - Google Patents

Description

The invention relates to a method for applying color powder, in particular Control powder, on surfaces to be ground, especially on Body parts of a motor vehicle to be ground, according to the preamble of claim 1.

From DE-A-296 10 030.7 a device is known which serves to make unevenness visible during painting work, particularly in motor vehicles. For this purpose, a color powder is applied to the surface to be ground, as a control powder, for example black powder. Damaged or areas to be repaired, for example on a body of a motor vehicle, must be filled and sanded several times to restore the original shape. As a control of the ground surface, rub black powder, which penetrates into the pore recesses, so that black unevenness is obtained. This gives the smoothed and not yet smoothed uneven surface a relatively even shade of gray. Blowholes and grooves are clearly visible and when sanding further, the areas to be sanded immediately become light again and the slightly lower areas remain dark. A new grinding process then takes place, which must be repeated so often that none
"blackened" places are more visible. As a result, the laborious grinding process is much easier to carry out for the craftsman's eye, since uneven areas are better recognized or become recognizable.

WO-A-95/30493 is an adhesive-free, dry, free-flowing Powder mixture known for use in the detection of surface defects is suitable, the powder mixture being a physical Is a mixture of particles of a dye and particles of a filler exists, the mixture of dye particles and filler particles comprises, each having a particle size of less than 100 microns. These powder mixtures offer a simple, effective conductive coating, the slight surface irregularities like scratches, Highlight orange peel and dry overspray without Solvents are required for this.

The device for applying a conductive coating on one surface to detect defects on it, includes an applicator pad that a contains dry powder mixture and can be applied to a base is, the applicator cushion with said dry powder mixture is impregnated. The device also includes a handle is attached to a holding pad that carries the applicator pad, a Storage container is provided, which is located inside the handle and which contains the dry powder mixture. In addition, is a Release means is provided which is able to pass the powder mixture dispense the holding pad to powder the applicator pad from the Feed storage container.

According to WO-A-95/08405, a conductive coating is part of a Smoothing on a surface, for example a vehicle body, formed by a substance made of finely divided particles, for example a non-toxic, black, powdery, water-based paint, such as is spread over the surface that the fabric on irregularities of the Surface remains and thereby highlights any irregularity. The substance can be applied by an applicator, for example a synthetic one Foam or sponge impregnated with the fabric on the surface be wiped, the fabric in a loose, finely divided form in be stocked in a container or in a more compact, essentially one solid form, from which finely divided particles are detached can be. The largest part of the substance is then from the Surface removed when the surface is sanded down to highlight it Remove irregularities.

WO-A-96/30129 discloses an apparatus comprising a first container part in the material for distribution on a surface as a conductive coating in one essentially loose, finely divided particle form is contained, perforated Means by which the substance is sprayed or poured out of particles can and a second container part for receiving a Applicator, for example in the form of a sponge, on the the substance should be sprayed or poured out of particles. The device can be used with the applicator or as a spare part for refilling a existing device can be provided. The two container parts are so stitchable that they are removable and together can be connected.

None of these known methods and devices used a color powder or a color mixture used that has an adhesive effect on the respective surface, such as the body part, and above is also resistant to water used in wet grinding.

Furthermore, a transparent lacquer with gloss pigments Painting of motor vehicles known, in the applied state gives an optical depth effect. However, this transparency ends on five differently colored surfaces, one of which is colored black. When sanding the black surface with dry sanding, the sanded surface is gray, so that an additional Coloring with another color is actually not necessary would be, since a grinding control exists and will be maintained. But if with Water sandpaper is sanded wet - the majority of the Car painter grinds wet - then the sanded surfaces are through the wetness not recognizable, since the ground surfaces are not recognizable Color changes are subject.

It is an object of the present invention to provide an improved method of to create the above-mentioned type which overcomes the above-mentioned disadvantages, a check of the ground surface, especially in the case of wet grinding, allows.

This task is accomplished by a method of the above. Kind with the claim 1 marked features solved.

For this purpose, it is provided according to the invention that the control powder is more preferred How an orange colored powder is applied, which one has a slightly sticky effect, anchors itself to the surface and has a resistance to water, including colored powder other colors can be used, but always Shades should be used that match the color of the substrate result in a tint that is recognizable by the color The color of the surface differs.

The method according to the invention and the use of an orange one Powders improve control options, especially with one Wet grinding. Surprisingly, it was found that at the use of an orange powder, which with the wiping block is applied to a black background, a coloring is obtained in the color of a gold shimmering green. The thus at Wetness not visible due to the wet grinding on a black background ground surfaces obtained by the invention Selection of the orange colored powder used a greenish gold Shimmer, so that the sanded surfaces even when wet are recognizable, so that an optimal visual control over the condition the surface is obtained during or after grinding, since it is always must be sanded until the valley of the unevenness is reached, so that a perfect painting can be obtained later.

Diese Mischung hat die Eigenschaft, sich auf dem Untergrund schwach klebend zu verankern und dadurch auch nicht bei einem Naßschleifen vom Wasser weggespült wird. Der dabei auftretende grünliche Schimmer tritt insbesondere bei dunklen Untergründen auf. Wenn es jedoch zu einem Kontrast kommt zwischen dem orange-schwarzem Pulver oder goldschimmemden Grün ist das Sichtbarmachen beim Schleifen - auch unter fließendem Wasser - ausschlaggebend; und hierbei ganz speziell das "Nichtwegschwimmen". Dieser schwache Klebeeffekt und die Resistenz gegen Naßschliff tritt auch bei schwarz pigmentiertem Pulver auf, weil die Rußpartikelchen weich sind und sich so verhalten, als wären sie schwach fettend.

The use of an orange colored powder has another advantage:

This mixture has the property of anchoring itself to the surface with a weak adhesive and therefore not being washed away by the water during wet grinding. The greenish sheen that occurs occurs particularly on dark surfaces. However, if there is a contrast between the orange-black powder or gold-shimmering green, making it visible when sanding - even under running water - is decisive; and especially the "no swimming away". This weak adhesive effect and the resistance to wet grinding also occurs with black pigmented powder because the soot particles are soft and behave as if they were slightly greasy.

After applying the control powder, the Surface sanded wet.

A color powder is used as the control powder, which in conjunction with contains a color pigment on a dark or black background a clearly visible contrast with a wet grinding to Background results, the color powder preferably being an orange Color powder is that on a black background in a gold-green color scheme transforms. Microballons (hollow glass balls) be added, which improves flow behavior of the color powder is reached.

Advantageous further developments of the invention are in the subclaims characterized.

The color powder is applied by means of a device which has the following: a hand block made of elastic material with at least an open side, a color powder chamber containing the color powder, which has a separate dispensing cartridge that can be detachably inserted into the hand block is, with at least one opening when the dosing cartridge is inserted this is oriented towards the open side of the hand block, and at least a pillow placed on the open side of the hand block with a central opening, predetermined between an edge Spread around the center opening of the pillow and the hand block the at least one open side of the hand block has a recess is provided.

This has the advantage that when the dosing cartridge is inserted into the hand block an edge region of the cushion around the central opening in this recess can be pressed in, so that the dosing cartridge is simple and without large volume Press the pillow together into the hand block is. As a result, the cushion can also advantageously be made of one material be made, which has a certain elasticity, however a higher deformation resistance and a large compression resistance against volume compression. This deformation and compression resistance is then usable one again The dosing cartridge falls out of the hand block through the central opening to prevent the pillow from being required while at the same time being low Exertion of force for inserting the dosing cartridge into the hand block.

For optimal powder output regardless of the fill level of the dosing cartridge the dosing cartridge also advantageously has a powder dispensing nozzle out. This preferably has an opening of the dosing cartridge closing plate through which a tube passes extends which extends into an interior of the metering cartridge. The tube is preferably formed in one piece with the plate and tapers away from the plate towards the interior of the metering cartridge conical, being particularly advantageous on the plate opposite end is closed.

For an optimal powder output, the tube has on its side walls at least one powder outlet opening, which is preferably on plate-side end in the interior of the dosing cartridge and / or on one End of the tube facing away from the plate are formed.

To prevent an accidental, polluting fall out powder during non-use or storage of the device To prevent, is a detachable encompassing the pillow attachable cover provided.

For an optimal use of space in the hand block and the greatest possible Storage volume for powder is the diameter of the dosing cartridge equal to or slightly larger than the inside diameter of the hand block. This prevents frictional forces between an inner wall of the hand block and an outer wall of the dosing cartridge a falling out of the inserted dosing cartridge.

By making the hand block from semi-hard foam and the pillow made of elastic foam, in particular made of flexible polyurethane foam becomes an inexpensive manufacturing process and a simple handling of the device achieved.

It is particularly useful for making bumps visible on a surface advantageous if the color powder is a black powder with 85% Heavy spar and 15% carbon black, contains powdered pigments and / or Black powder, i.e. is a control black powder.

A round and / or stamp-shaped design of the hand block results in advantageously simple handling with only one hand, wherein the device is pleasant and easy to align in the hand of the operator lies.

Fig. 1

eine Schnittansicht einer Ausführungsform einer Vorrichtung zum Auftragen von Farbpulver auf zu schleifende Oberflächen in einem ersten Montagezustand,

Fig. 2

in einem zweiten Montagezustand,

Fig. 3

in einem dritten Montagezustand,

Fig. 4 bis 8

Schritte zur Handhabung der Vorrichtung,

Fig. 9

einen senkrechten Schnitt durch einen Teil des Handklotzes im Bereich der Farbpulverausgabeöffnung mit einem Kreuzschlitzventil im geschlossenen Ventilzustand,

Fig. 10

das Kreuzschlitzventil im geöffneten Zustand,

Fig. 11

eine Seitenansicht einer weiteren Ausführungsform der Vorrichtung zum Auftragen von Farbpulver auf zu schleifende Oberflächen mit einer das Farbpulver aufnehmenden Patrone mit einem Farbpulveraustrittsventil, das als Druck-Spende-Verschluß mit einer Kreuzschlitzdüse versehen ist, vor dem Einschieben der Patrone in den Innenraum des Handklotzes,

Fig. 12

in einem vergrößerten senkrechten Schnitt die das Farbpulver aufnehmende Patrone mit der Kreuzschlitzdüse und

Fig. 13

eine Ansicht auf die Kreuzschlitzdüse der Patrone gemäß Fig. 12.

The invention is explained below with reference to the drawings.
Show it:

Fig. 1

1 shows a sectional view of an embodiment of a device for applying colored powder to surfaces to be ground in a first assembly state,

Fig. 2

in a second assembly state,

Fig. 3

in a third assembly state,

4 to 8

Steps for handling the device,

Fig. 9

a vertical section through part of the hand block in the area of the paint powder discharge opening with a Phillips valve in the closed valve state,

Fig. 10

the Phillips valve in the open state,

Fig. 11

1 shows a side view of a further embodiment of the device for applying colored powder to surfaces to be ground with a cartridge holding the colored powder with a colored powder outlet valve, which is provided with a cross-slot nozzle as a pressure-donation closure, before the cartridge is inserted into the interior of the hand block,

Fig. 12

in an enlarged vertical section the cartridge holding the color powder with the cross-slot nozzle and

Fig. 13

12 shows a view of the cross-slot nozzle of the cartridge according to FIG. 12.

The application of color powder 42 by the method according to the invention is described below with the aid of the device 100 shown in FIG. 1 explained, which comprises a hand block 10 with an open side 12.

At a lower end of the hand block 10 is a cushion 14 around the open one Page 12 and arranged partially overlapping. A middle one Opening 18 is formed in the cushion 14 in the area of the open side 12 An edge region around the central opening 18 is designated by 19. A separate dosing and color cartridge 16 in the form of a container 28 is from below in the direction of arrow 20 through the central opening 18 and the open side 12 can be inserted into an interior 22 of the hand block 10.

An outside diameter of the metering cartridge 16 is wider than an inside diameter the central opening 18 so that when the dosing cartridge is inserted 16 in the hand block 10 a predetermined edge around the center Opening 18 is kinked around. This is indicated in Fig. 1 with arrows 21 and shown in detail in FIG. 2. Now a substantial compression to avoid the cushion 14 when inserting According to the invention, a recess 24 is provided which between Pillow 14 and the hand block 10 around the open side 12 of the hand block 10 is formed around. This recess 24 is, for example around the open side 12 circumferential groove-shaped recess 24 in Material of the hand block 10 on its underside. In this recess a predetermined peripheral edge region 19 around the central Opening 18 of pillow 14 pushed in without substantial Compression or volume reduction of the material of the pillow 14. This reduces the amount required to press the dosing cartridge 16 into the Hand block 10 required considerable effort.

If the dosing cartridge 16 is pushed in further in the direction of the arrow 20 finally, as shown in Fig. 3, the entire container 28 of the dosing cartridge 16 into the interior 22 of the hand block 10. The edge area 19 around the central opening 18 of the cushion 14 springs under one elastic restoring force of the material of the cushion 14 back into its Starting position and thus fixes the inserted dosing cartridge 16. Das Pillow 14 thus simultaneously serves as a holder for the metering cartridge 16 in the interior 22 of the hand block 10 and is against one in this way Secured falling out.

By optionally on an upper side 26 of the hand block, formed over the open side 12 further opening Dosing cartridge 16, if necessary, pushed out of hand block 10 again become.

As can also be seen from FIGS. 1 to 3, there is the metering cartridge 16 from a container 28 and a screw cap closing this 30, which has a nozzle 32 with an opening. This should be preferred when the dosing cartridge 16 is pushed in, not over the cushion 14 protrude. The length of the nozzle 32 is such that at use of the hand block 10, i.e. when blurring on one Surface the nozzle tip does not come into contact with the surface, to scratch or damage the surface of the surface avoid. When choosing the length of the nozzle 32, it should also be taken into account that when wiping over curves of body parts the material, e.g. Foam, the cushion 14 compressed more , thereby reducing the pillow material can come from ¼ of its normal strength. In this case, too Do not touch the tip of the nozzle 32 with the surface. For example, this is in Fig. 3 the case where this only occurs for the sake of illustration. The metering cartridge would have to be pushed further into the hand block 10 if necessary or cut the nozzle 32 accordingly. The screw-lock side Opening of container 28 is from a powder dispensing nozzle 33 with a plate 34 with a tube passing through it 36 closed. The tube is hollow on the inside and this cavity communicates with the nozzle opening 32 on the screw cap 30. The Tube 36 is also closed at its end 37 facing away from plate 34. Powder 42 can be removed from container 28 via powder outlet openings 38 in a side wall of the tube 36 through it to the nozzle opening 32 of the screw cap 30 and to the outside stream. As a result, one that may be located below the cushion 14 Surface wetted with color powder 42 accordingly.

4 to 8 show an example of the handling of a device 100 for applying color powder 42. First, the dosing cartridge 16 with the color or black powder 42 in it Hand or wiping block 10 pressed in (Fig. 4). It is particularly advantageous thereby the use of orange colored powder, in particular is used for wet grinding.

The choice of color of the control powder used is determined in each case according to the color of the surface. With a dark or black one A control powder with a color pigment is used underground, which a clearly visible contrast with a wet grinding to dark or black background results, being particularly advantageous the use of an orange colored powder that is on the black Turns to a gold-green color, so that a there is a clearly visible contrast when wet grinding, thus the grinding control remains guaranteed even with wet grinding. All used Color pigments are in a free-flowing state due to suitable additives brought, preferably by microballoons. Is against it lighter background, a dark or black color powder is used.

In the case of using an orange colored powder on a black background, a bronzing effect occurs when wet grinding obtained, which is preferably also achieved with bronze pigments, which are mainly pigments from predominantly flaky particles, e.g. Aluminum bronze pigments, Gold-bronze pigments and silver-bronze pigments in the form of metal powders heated in air to about 150 ° C, making it lightfast Tarnish colors (yellow, red, brown, orange, violet) are obtained, dyeing with dyes is also possible, the so-called Patent bronzes are created.

Instead of an orange powder, control powders can also be used other pigments are used, e.g. the under the trade name Iriodin known pearlescent pigments based on mica and titanium dioxide or fish silver pigments.

Then a tip of the nozzle opening 32 is cut off or pinched off (Fig. 5). First of all, it is advantageous to be essentially conical Cut off nozzle opening 32 in such a way that only a small hole is created, i.e. only cut a little, otherwise when turning the device 100 possibly too much powder 42 falls out.

Then you move the wiper block with the opening 12 upwards, So against the effect of gravity, to the work object (Fig. 6).

By ordinary turning, preferably without pressing, as in Fig. 7, automatically a certain amount of powder 42 out. When using from the side, gently press gently to to achieve a desired blackening effect when wiping. The pressing However, may only be done if the wiping block 10 on a to be treated Object rests. Blow powder 42 into the air absolutely be avoided. Instead, the Wiper block 10 preferably always with firmly resting on the object Foam cushion 14.

For storing or transporting the wiping block 10 with an inserted one Metering cartridge 16 is moved as shown in FIG. 8. The pillow 14 the wiping block 10 is closed with a transparent hood 40, so that powder 42 is not accidentally spilled. The hood 40 is included preferably designed such that they the cushion 14 and possibly a part of the lower part of the wiper block 10 fits around and circumferentially by appropriate frictional forces between hood 40 and cushion 14 is fixed to the wiper block 10. By pulling the hood 40 against it The wiping block 10 is then immediately ready for use again.

For better mounting of the dosing cartridge 16 in the interior 22 of the hand block 10 is on the wall surface 10a delimiting the interior 22 of the hand block 10 preferably in the transition area to the circumferential Recess 24 at least one spring-elastic knobs, nose, rib or a circumferential annular bead 15 is formed (Fig. 2), which when inserting the metering cartridge 16 in the direction of arrow 20 into the interior 22 of the hand block 10 due to its elasticity in the direction of arrow X or be pushed away so that the dosing cartridge 16 is inserted can and if this is moved to its end position, the Noses, knobs or the edge beads 15 back again and form the support for the dosing cartridge 16. When pulling out the dosing cartridge 16 from the hand block 10 are the noses, knobs or the Edge beads 15 pushed away sideways so that the dosing cartridge 16 effortlessly can be removed from the hand block 10. There is also Possibility of pimples, noses and edge beads at intervals 15 to provide, so that each in adaptation to the length of the used Dosing cartridges can be held.

The knobs, ribs or lugs 15 are each so on the inner wall surface 10a arranged that holding and support levels for the dosing cartridge 16 are created, in addition to a single, lower Holding and support levels also several above and at intervals can be provided horizontally. In addition to a single knob, rib or nose 15 can also have several knobs, ribs or noses 15 be formed annularly on the inner wall 10a.

The metering cartridge 16 has a length with respect to its cartridge body on the approximately the length or height of the interior 22 of the hand block 10 corresponds, so that the knobs, ribs, noses or the edge beads 15 the cartridge body in the inserted state of the metering cartridge 16 reach behind, as indicated in Fig. 3 at A. Thereby the dosing cartridge 16 is held securely in the hand block 10.

The tube 36 for supplying the color powder to the powder discharge nozzle 33 the dosing cartridge 16 has a length which is such that at in the hand block 10 inserted dosing cartridge 16 this tube 36 their powder discharge nozzle 33 at the end is not out of the plane protrudes, which is formed by the bearing surface 14a of the cushion 14. The length of the tube 36 with the powder dispensing nozzle 33 is one another embodiment so dimensioned that the free end of the powder dispensing nozzle 33 to lie about halfway up the cushion 14 comes; i.e. the powder nozzle tip protrudes even when the cushion is compressed not from the one then formed by the outer wall of the pillow Level out.

In order to ensure an even and easily metered color powder discharge, is the dosing cartridge to be picked up by the hand block 10 16 not provided with a color powder dispensing nozzle 33, but only provided with an outlet opening 12 ', which by means of a flexible, ferdernd-elastic film 90 is closed, the center with a valve 89 is provided (Fig. 9). This valve 89 is in the form of a cross slot 91 formed with slot-shaped openings and in such a way that in the non-pressurized state, the cross slot 91 or its closed slot-shaped openings delimiting film sections are so that no color powder can escape. However, under pressure the slit-shaped openings open in the direction of arrow X. of valve 89 so that colored powder can escape. The size the openings formed by the slot-shaped openings depends on the size of the pressure, the interior of the Dosing cartridge 16 acts on the valve 89.

If a device 100 without a metering cartridge 16 is used, it can Even then, a uniform and meterable color powder discharge is guaranteed become. The device 100 then exists according to a further embodiment from the hand block 10 from an elastic or resilient-elastic Material with the property that when compressed of the material itself in its starting position resets. This hand block 10, as described above. This Hand block 10 is open on one side at 12 and has one Color powder 42 receiving chamber 22 for receiving the color powder on (Fig. 1 and 9). The hand block 10 is in the area of the open side 12 a pillow 14 for applying the paint powder to a body part provided, which is provided with a central opening 18.

The central opening 12 of the hand block 10 is by means of a valve 89 sealed, through which a metered delivery or delivery of the color powder is possible. This valve 89 is formed by one on the hand block 10 attached in the region of its opening 12 flexible, resilient-elastic Film 90, e.g. made of a silicone rubber that covers the opening 12 closes and the middle with a cross slot 91 with cross-shaped slot-shaped openings is provided. In the pressureless The state is the cross slot 91 or its slot-shaped Breakthrough-defining foil sections arranged or take a position on the basis of the slit-shaped openings of the cross slot 91 are closed, so that then color powder can escape or flow out of the hand block. Will be against exerted pressure on the hand block 10 so that an internal pressure arises, which is indicated in Fig. 10 by the arrow X, whereby the Valve 89 is pressurized from the inside, then the cross-head valve opens, in which the slot-shaped openings open, whereby the size of the respective openings on the strength of the pressure the valve hangs. The color powder discharge opening, which acts of pressure on the valve is indicated in FIG. 10 at 95. ever after positioning the hand block e.g. in an overhead position, in a horizontal position or vertical position is a mixture of air and color powder or just pourable paint powder or just air. at The valve closes instantly, releasing the pressure through the resilience of the film in the area of Cross slot is effected.

In the exemplary embodiment shown in FIG. 11, this is the color powder receiving cartridge or container 16 corresponding to the interior 22nd of the hand block 10 formed so that in the inserted state Cartridge 16 fills the interior of the hand block 10. Since the cartridge 16 consists of a resilient-elastic material, e.g. a plastic, is the cartridge wall compressible when on the hand block 10 from pressure is exerted on the outside, so that the carrier powder is then removed from the Phillips valve 89 can emerge (Fig. 13). That in the interior of the Cartridge 16 arranged and opening into the outlet opening 99 at one end Riser pipe 96 with openings 97 formed in its wall to prevent the powder from flowing in in the direction of the arrow X1 vertical actuation of the wiping block that too large amounts of Color powder can emerge at once (Fig. 12). Also at a horizontal actuation of the wiping block is the dosage of the Color powder compared to vertical actuation Color powder evenly a lot.

In order to properly operate the cartridge 16 for the colored powder ensure, the upper wall surface 10b of the hand block 10 with a preferably central opening 40 provided (Fig. 11).

Claims (12)

1. Method for applying powder paint (42), in particular control powder, by means of a discharge device onto surfaces to be ground, in particular onto car body parts of a vehicle to be ground, whereby a powder paint is applied as control powder which obtains, in connection with a support when wet grinding the surface, a coloration contrasting with and differing from the colour of the support,
   characterized in that preferably an orange powder paint is applied as a control powder which possesses a weakly adhesive effect, adheres by bonding to the support and shows a resistance against water.
2. A method according to claim 1,
   characterized in that microballoons are mixed to the powder paint for improving the flow behaviour.
3. A method according to any of the claims 1 and 2,
   characterized in that the surface is wet ground after application of the powder paint.
4. A method according to claim 1 to 3,
   characterized in that the powder paint (42) is applied with a device which consists of a hand block (10) made of an elastic material with at least one open side (12), a powder paint chamber containing the powder paint (42) which is configured as a separate metering cartridge (16) removably insertable into the hand block (10), whereby at least one opening (32) of the metering cartridge is orientated to the open side (12) of the hand block (10), the metering cartridge (16) being inserted, and of at least one cushion (14) made of foam, in particular of polyurethane soft foam with a central opening (18), this cushion being placed on the open side (12) of the hand block (10), whereby a recess (24) is provided between an edge (19) of predetermined width around the central opening (18) of the cushion (14) and the hand block (10) around the at least one open side (12) of the hand block (10).
5. A method according to any of the claims 1 to 4,
   characterized in that the paint powder is applied by means of a metering cartridge (16) with a powder discharge nozzle (33) which has a plate (34), which closes the opening (32) of the metering cartridge (16), through which a tube (36) extends which runs into an inner space of the metering cartridge (16), whereby the tube (36) is configured in one piece with the plate (34) and tapers from the plate (34) away in direction of the metering cartridge inner space.
6. A method according to claim 5,
   characterized in that the paint powder is applied by means of a metering cartridge (16) with a plate (34) closing the opening (32) of the metering cartridge (16) with a tube (36) which is closed at its end (37) turned away from the plate (34) and which shows at least one powder outlet opening (38) on its side walls.
7. A method according to any of the claims 4 to 6,
   characterized in that, for applying the paint powder, a metering cartridge (16) is used, the diameter of which is the same or somewhat bigger than an inner diameter of the hand block (10) made of an elastic foam, in particular of polyurethane soft foam, whereby a metering cartridge (16) is used, the shape of which corresponds to the shape of the inner space (22) of the hand block (10).
8. A method according to any of the claims 1 to 7,
   characterized in that the paint powder (42) contains powdery pigments, heavy spar and carbon black.
9. A method according to claim 8,
   characterized in that the paint powder (42) is a black colour powder, in particular a black powder with 85% heavy spar and 15% carbon black.
10. A method according to any of the claims 4 to 9,
    characterized in that a hand block (10) is used on the wall surface (10a) limiting the inner space (22) of which at least one tappet, nap, rib or peripheral border swellings (15) made of resilient synthetic or foam material having a restoring ability are moulded in the lower area in the vicinity of the recesses (24) for locking the metering cartridge (16) inserted into the hand block (10).
11. A method according to any of the claims 1 to 10,
    characterized in that a hand block (10) with a metering cartridge (16) with a paint powder discharge opening (12') is used which is closed by means of a flexible resilient foil (90) which is provided in its center with a valve (89) which is configured in form of a cross recession (91) with slit-shaped cuts, namely in such a way that, in a pressure unloaded state, the foil sections limiting the cross recession (91) or its slit-shaped cuts are closed and that, in an inner pressure loaded state, the slit-shaped cuts open, whereby the size of the cuts of the slit-shaped openings depends on the pressure.
12. A method according to any of the claims 1 to 10,
    characterized in that a device for discharging paint powder (42) is used, in particular onto car body parts to be ground of a vehicle, by using a hand block (10) made of an elastic material with at least one open side (12), with a paint powder chamber (22) containing the paint powder (42) for receiving the paint powder or an insertable paint powder cartridge (16) with a paint powder discharge opening in the area of the open side (12) of the hand block (10) and with at least one cushion (14) with a central opening (18), the cushion being placed on the open side, the opening being closed by means of a flexible resilient foil (90) which is provided in the middle with a valve (89) which is configured in form of a cross recession (91) with slit-shaped cuts, namely in such a way that, in a pressure unloaded state, the foil sections limiting the cross recession (91) or its slit-shaped cuts are closed and that, in an inner pressure loaded state, the slit-shaped cuts open, whereby the size of the cuts of the slit-shaped openings depends on the pressure.

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