Pigment cups made of natural fiber materials

Abstract

This invention relates to a pigment cup (1) for a paint spray gun (2), the pigment cup having a pigment container (3) with an opening, the pigment container having a can wall portion (3') and a cap that closes the opening. A coupling segment of the can wall portion (3') is arranged in a liquid-tight manner between a first clamping surface and a second clamping surface of a cap system including the cap, wherein the can wall portion (3') is made of a natural fibrous material, particularly a cellulose-based fibrous material. The invention also relates to a method for sealingly closing such a pigment cup (1). With the cap in a sealed connection to the can wall portion (3') made of a natural fibrous material, the coupling segment is clamped radially and / or axially.

Description

Technical Field

[0001] This invention relates to a pigment cup for a paint spray gun. Background Technology

[0002] The pigment cup for a paint spray gun has a generally sealable container for the pigment, which can be coupled to the paint spray gun via a pigment outflow opening so that the pigment can flow from the pigment cup into the paint spray gun (pigment flow cup), where the pigment is atomized by means of compressed air. This pigment cup is made of plastic. For example, a pigment cup with a cap system having a closed opening is known from EP 1 424 135 B1.

[0003] As global resources become increasingly scarce, alternative materials made from sustainable raw materials are becoming increasingly interesting for use in the pigment cup industry, where existing pigment cup and lid systems do not offer sufficient inherent stability or leak-proof safety when combined with such materials in harsh workshop environments. Summary of the Invention

[0004] The purpose of this invention is to provide a pigment cup for a paint gun that has sufficient sealing properties.

[0005] According to the present invention, the pigment cup for a paint gun has an opening that can be closed by means of a cap that closes the opening. Here, the coupling section of the can wall is arranged in a liquid-tight manner between a first clamping surface and a second clamping surface of a cap system including the cap, wherein the can wall is made of a natural fiber material.

[0006] The clamping mechanism, achieved through frictional engagement with the can wall, also enables the use of low-strength materials composed of natural fibers or plant materials. Natural fiber materials or plant materials can be understood as materials such as paper, thick paper, cardboard, corrugated cardboard, or composite materials containing one of the aforementioned material layers. Specifically, they are cellulose-based fiber materials. Natural fiber materials are, for example, paper materials designed from wood pulp, cellulose, semi-pulp, or waste paper through bonding or pressing.

[0007] The can wall portion can extend along the longitudinal axis and be constructed substantially rotationally symmetrically, wherein the coupling section is advantageously clamped between a first clamping surface and a second clamping surface in the radial and / or axial directions. A liquid-tight connection between the cap system and the pigment container, based on different materials and / or material pairs, is feasible through the advantageously designed clamping mechanism.

[0008] In one advantageous embodiment, the coupling section is configured as a substantially axial end section of the tank wall. Alternatively, the coupling section may also be configured as a radially outwardly projecting annular flange from the tank wall.

[0009] Advantageously, the lid system may include a lid and a mating ring, wherein the coupling segment is radially clamped between the lid and the mating ring. This embodiment has the advantage that the can wall portion undergoes little or no fitting, and the axial end segment can be adapted to or matched with existing manufacturing techniques with minimal effort. The lid system can be reused and, for example, made of classic inorganic plastics.

[0010] The mating ring can be detachably moved onto or inserted into the pigment container. Alternatively, the mating ring can be fixedly connected to the container wall. For this purpose, the mating ring can be directly molded into the pigment container during injection molding, fused as a single component to the plastic surface of the pigment container, or bonded to the pigment container. The connection between the mating ring and the pigment container is preferably liquid-tight.

[0011] A particularly material-saving variant is obtained by replacing the closed circular mating ring with a threaded section molded only at the pigment container, preferably by injection molding with plastic in an injection molding method, wherein the threaded section can engage with the threaded section at the cap, which is constructed as a screw cap.

[0012] However, the mating ring, constructed with a plastic edge, can have almost any known connection system between itself and the cap, such as a screw connection or a snap-lock connection. For example, the mating ring can have a threaded edge that engages with a cap constructed as a threaded cap. Alternatively, the mating ring can have a snap-lock edge that cooperates with a locking tab at a cap constructed as a snap-lock cap.

[0013] The pigment cup with a pigment container is inventive, regardless of whether the coupling section of the can wall is arranged in a liquid-tight manner between the first and second clamping surfaces of the cap system including the cap, wherein the pigment cup has a can wall made of natural fibers, especially cellulose-based fibrous materials, wherein a mating ring, preferably a mating ring made of plastic or an injection-molded threaded section is fixedly disposed in the can wall.

[0014] Particularly preferably, the cap and the mating ring may each have paired threads for screwing into each other. This allows for a large pressing force at the clamping surface, which is largely independent of the material properties of the can wall.

[0015] To achieve a secure clamping, the mating ring may be equipped with a first operating section and a second functional section (axially) disposed thereon. The functional section itself may include an externally threaded section with threads. The functional section may also include a sealing section with a preferred tapered configuration having a first clamping surface at its radially inward face. Furthermore, the cap may have a cap section and a hollow flange on the outer circumference. The hollow flange advantageously has a radially inner flange and a radially outer flange for receiving the mating ring, wherein the outer flange has a threaded section that mates with the threaded section, and the inner flange has a second clamping surface with a preferred tapered or frustoconical configuration. In particular, a preferred wedge-shaped receiving portion is formed between the inner and outer flanges for the sealing section of the mating ring and the coupling section at the pigment container. The coupling section of the can wall portion can be radially clamped between the first and second clamping surfaces when the first and second threaded sections are screwed together. This eliminates the need for a thickened portion or sealing protrusion at the end of the pigment container.

[0016] To further prevent the can wall from slipping out, the axial end section of the can wall can extend in a tapered, open or closed manner. This increases the retaining or clamping force on the can wall without, for example, adding an actual force to the threaded connection. This makes it more difficult for the can wall to slip out or be pulled out of the hollow flange.

[0017] In an alternative implementation that offers no diminished advantage, the mating ring can be constructed as a retaining ring. The retaining ring preferably has an annular groove. The annular flange of the cap and the can wall portion is, for example, elastically secured in the annular groove. In other words, the annular flange of the can wall portion and the cap are tightly pressed together by the retaining ring. Although additional manufacturing steps are required for the can wall portion or the coupling section of the can wall portion due to the annular flange, this allows for, for example, the construction of a less resource-intensive threaded cap system.

[0018] The annular flange can advantageously be constructed as a hollow or non-hollow sealing protrusion. The sealing protrusion can be understood as a localized thickening of the can wall portion at its opening-facing end. This sealing protrusion advantageously allows for adjustment and variation of the elastic modulus of the coupling section, thereby influencing and increasing the tightness of the connection between the cover system and the can wall portion. The cross-section of the sealing protrusion can be made, in particular, circular or elliptical, thereby achieving a large elastic modulus.

[0019] In another alternative, but equally advantageous, embodiment, the lid may have an annular crimp, and the lid system may have at least two closing members radially opposed to the annular crimp, the closing members being movably connected to the lid via hinges. This achieves essentially one-piece manufacturing of the lid system. The one-piece lid system also simplifies operation.

[0020] In an advantageous improvement, the cover also has an annular flange. Advantageously, a first clamping surface can be arranged at the annular flange of the cover and a second clamping surface can be arranged at the closing member, wherein the first and second clamping surfaces are preferably respectively concave. The concave design achieves reliable reception of, for example, sealing protrusions, where frictional fit can be compensated by form-fitting force members.

[0021] In all embodiments, the additional sealing mechanism can be advantageously arranged between the first and second clamping surfaces. For example, the sealing mechanism can be in the form of an O-ring. The additional sealing mechanism provides greater flexibility in the selection of available materials for the cap system and / or tank wall without adversely affecting the sealing performance.

[0022] In a particularly preferred embodiment, the pigment container has a bottom that is closed on at least one side of the container wall, the bottom preferably being made of a natural fibrous material, particularly a cellulose-based fibrous material.

[0023] Particularly advantageous is the following variation of the invention, in which the can walls and / or bottom are made of cardboard. This results in a weight greater than 200g / m². 2 Flat materials made from plant / natural fibers are considered as cardboard.

[0024] For the use of the pigment cup according to the invention in the paint industry, it is particularly advantageous that the can wall and / or bottom are provided at least on the inner side with a liquid-resistant, preferably solvent-resistant, coating, which is made of plastic and / or aluminum in particular.

[0025] In all embodiments, the can wall section, or if necessary, the bottom, is made of one, two, or three layers. Particularly conceivable and feasible is that the can wall section is constructed of cardboard that is glued once or twice. A higher layer density can advantageously affect the stability of the can wall section and the pigment cup itself, thereby increasing the lifespan of the pigment cup, for example, for multiple uses.

[0026] Furthermore, the pigment cup may have rising or falling level indicators and / or mixing scales on its inner or outer side. Preferably, the level indicators and / or mixing scales are printed onto a fibrous material.

[0027] The various parts of the pigment cup can preferably be constructed to be transparent and / or opaque. This allows for optical inspection of the liquid level and / or the proper connection between the pigment container and the cap system in any situation. For example, the pigment container, mating ring, retaining ring, and / or cap can be constructed to be transparent. Transparent plastics and / or cellulose, such as transparent paper, are known.

[0028] The cap may have a pigment outlet for connection to a paint gun. Alternatively, the pigment outlet may not be integrated into the cap system, but rather integrated into the can wall of the pigment cup. For example, the can wall may transition into a conical, for example, truncated cone-shaped bottom of the pigment cup, allowing the pigment cup to be manufactured as a single piece without the cap system. The bottom may optionally have an interface for connection to a paint gun or for connection to an adapter for connecting to a paint gun. This reduces component requirements and thus reduces the types of variations.

[0029] Advantageously, a valve for balancing the atmospheric pressure between the internal volume of the pigment cup and the atmosphere is also provided at the lid or at the bottom, wherein the valve is particularly advantageously configured as a piercing pin for piercing the wall of the pigment cup, especially the bottom of the pigment cup.

[0030] In the method for sealing a pigment cup according to the invention, when the lid and the can wall are sealed together, the can wall or its coupling segment is clamped radially and / or axially so that the stability characteristics of the can wall are less important. This opens up new possibilities for alternative materials. Attached Figure Description

[0031] Advantageous designs and other features of the invention are derived from the accompanying drawings and the following description thereof. Identical or at least similar features are given the same reference numerals herein.

[0032] As shown here,

[0033] Figures 1 to 3 The illustration shows a side view, a front view, and a cross-sectional view of an embodiment of a classic pigment flow cup according to the invention, with a paint spray gun, the pigment cup having an opening closed by a lid.

[0034] Figures 4 to 6 Show Figures 1 to 3 Detailed exploded side views, front views, and sectional views of the cover system.

[0035] Figure 7 A detailed diagram of the cap system in its connected state to the pigment container is shown.

[0036] Figure 8 and Figure 9 The illustration shows a front view and a cross-sectional view of a pigment cup with a cap system having a retaining ring according to the present invention.

[0037] Figure 9A Show Figure 9 Enlarged images of details in the image.

[0038] Figures 10 to 12 The diagram shows a side view, a front view, and a cross-sectional view of an embodiment of the pigment cup with a spray gun according to the invention, as an inverted variant.

[0039] Figure 13 and Figure 14 A front view and a cross-sectional view of another embodiment of the pigment cup according to the invention are shown.

[0040] Figure 14A and Figure 14B Show Figure 14 Enlarged images of details in the image.

[0041] Figure 15 A top view of a disc-shaped sieve element is shown, and

[0042] Figure 16 Different cross-sectional shapes of the back bar are shown. Detailed Implementation

[0043] exist Figures 1 to 3 The image shows a pigment cup 1 with a lid 5 and a pigment container 3. The pigment container 3 has an outer, slightly conical can wall, with a funnel-shaped extension for a pigment outlet 26 attached to the lower side of the can wall. The outlet 26 is detachably connected to a spray gun 2 via a corresponding connection. Due to gravity, the pigment in the pigment container 3 flows into the paint spray gun 2 and remains there until it is carried and atomized by the compressed air flow provided by the paint spray gun 2.

[0044] The entire pigment container 3 is made of organic material. It can be a single layer or multiple layers of cellulose (paper, cardboard). The pigment container 3 can be constructed as a single piece or in multiple pieces, particularly consisting of multiple segments glued or pressed together. Figures 1 to 3 In one embodiment, the pigment container 3 is double-layered but integral, meaning it does not form segments that are subsequently connected to each other. The pigment cup 1 can be made, for example, from a blank rolled into a hollow body and glued at the connecting edges. The pigment cup also has a liquid-resistant coating, at least on the inner side, which is made, in particular, from an organic, biodegradable plastic.

[0045] The pigment cup 1 has an opening 4 on its upper side, for example, the side opposite to the spray gun 2, designed as a refill opening, see [reference]. Figure 4 When the paint cup 1 is mounted on the spray gun 2, the paint can be refilled at any time through the opening. The refill opening 4 is formed by a coupling segment 6a, which is described in more detail below, of the can wall portion 3'. The opening 4 is closed via a cap system 9 having a cap 5 and a mating ring 10. The cap 5 includes a cap segment 13, which... Figures 1 to 3 The view shows the container pierced by piercing nail 27. Piercing nail 27 establishes an atmospheric connection between the interior of the pigment cup 1 and the environment via a mechanism not detailed.

[0046] exist Figures 4 to 6 Describe concisely and in exploded view Figures 1 to 3 Pigment cup 1. In Figure 7The image shows a pigment cup 1 with an installed cap system 9. (Reference) Figures 4 to 7 A more detailed description of the structure of cover system 9:

[0047] As already described, the cover 5 includes a cover section 13 to which a hollow flange 14, consisting of column flanges 15 and 16, connects to the cover section 13 on the circumferential side and substantially perpendicularly. Here, the outer column flange 16 extends further in the axial direction than the inner column flange 15. On the inner circumferential side, a threaded section 17 with discontinuous threads 17a is molded onto the outer column flange 16. On the outer circumferential side, a sealing section 11' with a clamping surface 7 is constructed onto the inner column flange 15. As particularly from… Figure 7 As can be seen, a wedge-shaped receiving portion is obtained between flanges 15 and 16 for sealing section 11' and coupling section 6a. The outer circumferential side of the column flange 16 has a gripping aid that should simplify the rotation of the cover 5.

[0048] The hollow flange 14 is used to tensionally accommodate the mating ring 10 of the pigment cup 3 and the coupling section 6a held between the mating rings.

[0049] The mating ring 10 is constructed in a cylindrical or slightly conical shape, and when viewed in the axial direction, includes an operating section 12 with an externally mounted gripping recess at the lower part and a functional section 11 disposed thereon. The functional section 11 includes a threaded section 11' with a discontinuous external thread 11a on its outer side. In the inner circumference of the functional section 11, i.e., radially inward, the sealing section 11'' is equipped with a second clamping surface 8.

[0050] At the pigment container 3 of the pigment cup 1, a coupling segment in the form of an extended can wall portion or axial end section is constructed to the can wall portion 3', which is essentially cylindrical in design. The coupling segment may have the same structure as the rest of the can wall portion 3', or it may have, for example, a border.

[0051] To seal the connection between the cap system 9 and the pigment container 3, the mating ring 10 is moved from below to the outside of the can wall portion 3', while the cap 5 is fitted from above onto the can wall portion 3' having the coupling section 6a. The mating ring 10 or its threaded section 11' then engages with and screws into the threaded section 17 of the column flange 16. Here, the coupling section 6a is located between the outer circumference of the inner column flange 15 of the cap 5 and the inner circumference of the threaded section 11' of the mating ring 10. The aforementioned outer and inner circumferences form clamping surfaces 7 and 8, tensioning the coupling section 6a between the clamping surfaces. Tensioning is achieved through the axial movement formed during screwing into the gap created by the hollow flange 14 through the threaded section 11, which becomes increasingly narrower axially due to the wedge shape of the column flange 16. Thus, the coupling section 6a is radially and sealingly tensioned. In the screwed-in state, the pigment container 3 also cannot be removed from the cap system 9 due to friction. This cap system 9 is particularly suitable for pigment containers 3 with very thin walls, where radial clamping can be easily achieved.

[0052] In an embodiment not shown, the mating ring 10 may also be fixedly connected to the can wall portion 3'. For this purpose, the mating ring 10 may be directly injection molded onto the pigment container 3 in an injection molding process, fused to the plastic surface of the pigment container 3 as a separate component, or bonded to the pigment container 3. Preferably, in this variant not shown, the connection between the mating ring 10 and the pigment container 3 is liquid-tightly constructed.

[0053] Because the actual connection is not visible from the outside and the risk of misuse cannot be eliminated, the mating ring 10 and / or cap 5 are designed to be transparent or at least opaque. Furthermore, to identify the correct connection, the coupling section 6a is advantageously highlighted in color relative to the remaining can wall portion 3', for example, by a surrounding mark. Preferably, the mark also has properties that increase friction. Alternatively or additionally, the coupling section 6a may also have a paint or other coating that increases friction and / or density.

[0054] According to Figures 10 to 12 In a modified embodiment of the foregoing embodiment, the pigment cup 1 can also be constructed as an inverted variant. For this purpose, the lid 5 is funnel-shaped and has an outlet opening. The lid system 9 remains unchanged in other respects. The difference in the pigment container 3 is that it now has a flat bottom 28, which can be pierced by a piercing pin 27. Furthermore, although the coupling segment 6a of the pigment container 3 is constructed as the end segment of the remaining can wall portion 3' and, particularly, lacks a thickened portion or annular flange at the can wall portion 3', it can have a changed angle relative to the can wall portion 3'. The coupling segment 6a of this embodiment is here constructed in a conical open shape, having a larger angle than the conical can wall portion 3' of the pigment container 3. This increases the clamping force and improves the sealing performance.

[0055] exist Figures 8 to 9A An alternative embodiment of the pigment cup 1 is shown, which, similar to the one described above, consists of a pigment container 3 and a lid system 9. Here, as with all the figures, the same or at least similar features are given the same reference numerals, thus omitting redundant explanations for brevity. In contrast to the previous embodiment, the coupling section of the pigment container 3 is here formed as a radial annular flange 6b, which can be manufactured, for example, by upsetting or rolling a portion of the can wall portion 3'. The annular flange 6b forms annular surfaces (not shown in detail in the figures) in its upper and lower axial portions, clamping between the annular clamping surface 7 of the lid 5 and the annular clamping surface 8 of the retaining ring 18. The clamping surface 7 is formed at the annular flange 23 of the lid 5, which extends radially outward and connects to form its basic funnel-shaped shape. The annular flange 23 and the annular flange 6b are surrounded in an annular groove 19 by the retaining ring 18, which has a C-shaped cross-section.

[0056] For installation, the retaining ring 18 is guided axially downwards to the annular flange 6b of the pigment container 3, and then the cap 5, together with its annular flange 23, is fitted from above and locked into the retaining ring with the retaining ring 18 retracted. For easier installation, chamfers are advantageously provided at the annular flange 23 and the upper support of the retaining ring 18, as if they were introduced from... Figure 9A visible.

[0057] The annular flange 6b is axially tensioned by a locking connection. This implementation has the advantage that the proper closure of the pigment container 3, thanks to the cap 5, can be perceived visually and audibly. However, it would be advantageous to construct the retaining ring 18 as transparent or at least opaque to, for example, identify early signs of ring penetration and the resulting risk of tearing. Similarly, it is possible to apply an advantageous coating to the annular flange 6b to increase sealing, elasticity, or other properties.

[0058] refer to Figures 13 to 14B Now, another embodiment of the pigment cup 1 with a snap-lock closure is described. The pigment container 3 depicted therein is closed by a lid system 9, wherein, contrary to the previous embodiment, the lid system 9 consists of a funnel-shaped lid 5 having a radially projecting annular flange 23 and an annular rolled edge 22 of a cylindrical construction projecting axially therefrom. Four fastening elements 24, hinged via hinges 25, are connected to the annular flange 23, and the fastening elements can be moved from an open position to a closed position. The coupling section of the pigment container 3 with the annular flange 23 is here constructed as a hollow, approximately annular sealing protrusion 21, which advantageously acts as a compressibility of the coupling section.

[0059] When the cap 5 is fitted, the sealing protrusion 21 abuts against the concave clamping surface 7 of the annular flange 23. The clamping surface 7 is introduced into the annular flange 23 as an arcuate and circumferential groove. The second clamping surface 8 located at the fixing element 24 is also concave. Clamping is achieved by hinged one or more fixing elements 24 such that the force is moved to a potential minimum when the fixing element 24 moves. The advantage of this implementation is that after the two fixing elements 24 are closed, a reliable and at least substantially liquid-tight connection is already established between the cap system 9 and the pigment container 3.

[0060] Alternatively, alternatives to natural fiber materials could be considered, such as other plant celluloses based on corn starch.

[0061] In alternative embodiments not shown, other designs may be used instead of the ventilation valve formed by the puncture pin 27. Examples include:

[0062] - A paper or film splice used to tear open and seal the previously created ventilation opening in the bottom of the cup;

[0063] - A threaded piercing pin that can be screwed into a screw-in area at the bottom of the cup, wherein optionally the screw-in area is reinforced by an additional layer of cardboard; the opening introduced by the pin may also be (again) closed by means of other screw-in closing elements.

[0064] - Valves that are applied or introduced, for example, by means of adhesive or welding connections; manually operable: plug-in type, rotary type, swing arm valve; automatically opened by negative pressure inside: scraper valve, honeycomb valve, diaphragm valve;

[0065] - A valve structure with an optional cap, wherein the cap has a cutting edge that cuts the closed membrane in a pre-introduced ventilation opening in the bottom or cup bottom when screwed down.

[0066] The pigment cup 1 preferably has a sieve element arranged inside the pigment cup 1 such that the pigment must pass through the sieve element before it can leave the pigment cup 1 through the pigment outflow opening 26. The sieve element is particularly preferably made at least in part of cardboard or thick paper in order to avoid the use of plastic materials found in disposable products and to achieve a simplified production method with the help of inexpensive tools.

[0067] exist Figure 15 The image exemplarily shows a top view of a disc-shaped flat screen element 29. It includes a cardboard ring 30 (e.g., stamped from pigment container material) and a plastic screen 31, the plastic screen being fused to the plastic coating of the cardboard ring 30. The cardboard ring 30 also has a control tab 32.

[0068] exist Figure 16The diagram exemplarily illustrates three variations of the cross-section of an elongated stirring rod 33 made of covered cardboard or paperboard. The stirring rod 33 becomes stable through its folded profile. Profiles can also be welded, such as seams in the paint container 3. The cross-sectional shape can also vary along the length of the stirring rod, thereby, for example, forming a gripping surface.

Claims

1. A pigment cup (1) for use with a paint spray gun (2), the pigment cup having a pigment container (3) with an opening (4), a can wall portion (3') made of natural fibrous material, and a cap system (9) for closing the opening, the cap system comprising a cap (5) and a mating ring (10) for engaging with the cap, wherein, The coupling section of the tank wall is arranged in a liquid-tight manner between the first clamping surface and the second clamping surface of the cover system, wherein the coupling section is clamped between the cover and the mating ring in the axial and / or radial direction, wherein the mating ring includes an operating section (12) and a functional section (11) arranged axially above the operating section, wherein the functional section includes an outer circumference with a threaded section, wherein the cover includes a cover section (13) having a hollow flange (14) around the outer circumference of the cover for receiving the mating ring, and wherein the outer surface of the hollow flange has a threaded section provided for engaging with the threaded section of the outer circumference of the functional section, and when the threaded section of the outer circumference of the functional section engages with the threaded section of the outer surface of the hollow flange, the coupling section is clamped between the first clamping surface and the second clamping surface.

2. The pigment cup (1) according to claim 1, characterized in that, The fiber material is a cellulose-based fiber material.

3. The pigment cup (1) according to claim 1 or 2, characterized in that, The tank wall portion (3') extends along the longitudinal axis and is constructed in a rotationally symmetrical manner, and the coupling segment is clamped between the first clamping surface and the second clamping surface in the radial and / or axial directions.

4. The pigment cup (1) according to claim 1 or 2, characterized in that, The coupling section is constructed as an axial end section of the tank wall portion (3'), the end section extending taperedly and openly, or the coupling section is constructed as a radially projecting annular flange, the annular flange being designed as a hollow or non-hollow sealing protrusion (21).

5. The pigment cup (1) according to claim 1 or 2, characterized in that, The cover (5) and the mating ring (10) each have a pair of threads for screwing into each other.

6. The pigment cup (1) according to claim 5, characterized in that, The mating ring (10) is equipped with an operating section (12) and a functional section arranged axially above the operating section, wherein the functional section has an external first threaded section and a second sealing section with a tapered structure surrounding the first clamping surface, and the cover (5) has a cover section (13) and a hollow flange (14) on the outer circumference, the hollow flange including an inner flange and an outer flange in the radial direction for receiving the mating ring (10), wherein the outer flange has a threaded section (17) that mates with the threaded section, and the inner flange has a second clamping surface with a tapered structure, so that the coupling section is clamped between the first clamping surface and the second clamping surface when the first threaded section and the second threaded section are screwed together.

7. The pigment cup (1) according to claim 1 or 2, characterized in that, The mating ring (10) is constructed as a retaining ring (18), which includes an annular groove (19), wherein the cover (5) and the coupling section are elastically fastened in the annular groove (19).

8. The pigment cup (1) according to claim 1 or 2, characterized in that, The cover (5) has an annular rolled edge (22), and the cover system (9) has at least two closing members radially opposite to the annular rolled edge (22), the closing members being movably connected to the cover (5) via hinges (25), wherein the cover (5) also has an annular flange, wherein a first clamping surface is disposed at the annular flange of the cover (5) and a second clamping surface is disposed at the closing member, and wherein the first clamping surface and the second clamping surface are each configured to be concave.

9. The pigment cup (1) according to claim 1 or 2, characterized in that, The pigment container (3) has a bottom (28) that closes the can wall portion (3') on at least one side, the bottom being made of the fibrous material.

10. The pigment cup (1) according to claim 9, characterized in that, The tank wall (3') and / or the bottom (28) are made of a weight greater than 200g / m². 2 Made of cardboard.

11. The pigment cup (1) according to claim 9, characterized in that, The tank wall (3') and / or the bottom (28) are provided with a liquid-resistant coating on at least the inside.

12. The pigment cup (1) according to claim 11, characterized in that, The can wall (3') and / or the bottom (28) are provided with a solvent-resistant coating on at least the inner side, the coating being made of plastic and / or aluminum.

13. The pigment cup (1) according to claim 9, characterized in that, The tank wall (3') and / or the bottom (28) are made of one, two or three layers.

14. The pigment cup (1) according to claim 13, characterized in that, The can wall (3') and / or the bottom (28) are made of cardboard that is glued once or twice.

15. The pigment cup (1) according to claim 1 or 2, characterized in that, The pigment cup (1) has an embossed level indicator and / or mixing scale on the inner and / or outer sides.

16. The pigment cup (1) according to claim 1 or 2, characterized in that, For optical inspection of liquid level, and / or for proper connection of the pigment container (3) to the cap system (9), multiple portions of the pigment cup (1) are designed to be transparent and / or opaque.

17. A method for sealing a pigment cup (1) according to any one of claims 1 to 16, characterized in that, When the cover (5) is sealed to the tank wall (3'), the coupling section is clamped in the radial and / or axial direction.

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