Applicator and method of manufacturing an applicator

Abstract

The present invention relates to an applicator (1) for applying an adhesive material to a substrate, comprising: an inner container (3) for receiving the adhesive material, the inner container having a discharge opening (18); an outer shell (2) surrounding the inner container (3) and including a generally hollow cylindrical neck region (6) having an inner diameter D1 and an opening (7) formed in the neck region (6); and an applicator (4) connected to the outer shell (2), wherein the adhesive material can be transferred from the inner container (3) to the applicator (4) by means of pressure on the outer shell (2) and can be applied to the substrate by means of the applicator, wherein the applicator (1) has a venting device and includes an insert (19) that is airtightly connected to the inner container (3) in the region of the discharge opening (18), is generally hollow cylindrical and has an outer diameter D2, wherein the outer diameter D2 of the insert (19) is smaller than that of the outer shell (2). The neck region (6) has an inner diameter D1, and the insert (19) has a latching device (22) on its outer side, by means of which the insert is latched in the insertion position in the neck region (6) of the outer shell (2), wherein in the insertion position, due to different diameters D1 and D2, an annular gap is formed between the insert (19) and the neck region (6) of the outer shell (2), through which air can flow from the outside into the intermediate space between the outer shell (2) and the inner container (3) and vice versa, and wherein the connection between the applicator (4) and the outer shell (2) is also airtight, and the applicator (4) includes a sealing device (25) by means of which the internal volume of the inner container (3) is sealed in an airtight and leak-proof manner relative to the intermediate space between the outer shell (2) and the inner container (3) when the applicator (4) is in the insertion position. The invention also relates to a method for manufacturing such an applicator (1).

Description

Technical Field

[0001] This application relates to an applicator for applying adhesive materials to a substrate. This application also relates to a method for manufacturing such an applicator. Background Technology

[0002] Such application devices are known in the prior art as application tools and are used, for example, in industry, handicrafts, or DIY fields. For instance, such application devices can be used to dispense sealants to seal joints between components in the sanitary field. Alternatively, adhesives or other sticky materials can be applied using such application devices.

[0003] A sealing device is known from patent publication WO2016 / 166237, which has a container for receiving sealant and an applicator that can be disposed on the opening of the container and latched to the container. The applicator has a dispensing opening for dispensing the sealant from the container onto a substrate, and the applicator is also designed such that, on the one hand, the dispensed sealant is smooth immediately after dispensing, and on the other hand, there is no excess sealant on adjacent surface areas of the substrate. In other words, the applicator is used to simultaneously dispense and form sealant, and for subsequent cleaning of adjacent areas of the substrate. The sealant is dispensed from the container of the sealing device by the user squeezing the container wall. The front and rear actuating surfaces of the container move toward each other, causing a reduction in the internal volume of the container, thereby forcing the sealant into the applicator and dispensing it through the dispensing opening of the applicator. For this purpose, the actuating surfaces can be designed such that certain areas are flexible or thin-walled to allow and facilitate deformation of the container wall.

[0004] This type of application apparatus has several drawbacks. Because many viscous materials exhibit thixotropic behavior, the apparatus must typically be shaken before use to improve material flow and deliver it to the dispensing opening. This is particularly true when applying to vertically oriented substrates, where the process may need to be repeated multiple times to ensure product availability at the dispensing opening. However, shaking introduces air into the material, which is detrimental to uniform material distribution and the absence of air bubbles. Once the pressure on the container dissipates and the container walls return to their initial shape due to restoring forces, a certain amount of viscous material is drawn back into the application apparatus due to the existing vacuum. Additionally, air is drawn into the container, particularly from the outside. This air can escape uncontrollably during subsequent dispensing and / or become trapped within the applied material. This cavitation impairs the functionality of the applied material, such as its sealing or adhesive properties, and reduces product durability due to air infiltration into the container.

[0005] Finally, due to the soft yet relatively hard material of the container wall, it is difficult to achieve complete emptying of the container; a considerable amount of sticky material always remains inside the container, and this considerable amount of sticky material will no longer be discharged by compressing the container wall.

[0006] A coating apparatus is known from patent publication DE202015106902U1. This apparatus has a receiving container for a paste-like ingredient, a cap with a dispensing nozzle, and a deformable wrapping surrounding the receiving container. The wrapping has corrugated folds that cause the wrapping to be squeezed to expel the paste from the receiving container. This can result in improved residual discharge, but air ingress and cavitation problems exist here on an equal footing. Summary of the Invention

[0007] Therefore, an object of the present invention is to provide a coating apparatus that overcomes the shortcomings of the prior art and enables the viscous material to be easily dispensed from the container onto the substrate in a uniform and more complete manner. Another object of the present invention is to provide a method for manufacturing such a coating apparatus.

[0008] These objectives are achieved by an application apparatus having the features of claim 1 and by a method having the features of claim 10.

[0009] According to claim 1, the present invention provides a coating apparatus for applying an adhesive material to a substrate, comprising an inner housing having a dispensing opening for receiving the adhesive material, an outer housing surrounding the inner housing (the outer housing having a generally hollow cylindrical neck region with an inner diameter D1 and an opening formed in the neck region), and a coating device connected to the outer housing, wherein the adhesive material can be conveyed from the inner housing to the coating device by pressure on the outer housing and applied to the substrate by the coating device. The applicator according to the invention is characterized by comprising a venting device having an insert that is airtightly connected to an inner housing in a region of a dispensing opening. The insert comprises an insert designed in a generally hollow cylindrical shape and having an outer diameter D2, wherein the outer diameter D2 of the insert is smaller than the inner diameter D1 of the neck region of the outer housing. Furthermore, the insert has a latching device on its outer side, by means of which the insert is latched in an insertion position in the neck region of the outer housing. In this insertion position, an annular gap is designed between the insert and the neck region of the outer housing due to the different diameters D1 and D2, through which air can flow from the outside into the intermediate space between the outer housing and the inner container, and vice versa. Additionally, the connection between the applicator and the outer housing is designed to be breathable, and the applicator includes a sealing device by means of which, in the use position of the applicator, an airtight and leak-proof seal is provided for the internal volume of the inner container relative to the intermediate space between the outer housing and the inner container.

[0010] In other words, the present invention proposes incorporating a venting device into the coating apparatus, such that when the outer shell is compressed, air located between the outer shell and the inner container is first discharged through the annular gap between the neck region of the outer shell and the insert of the inner container, and through the non-airtight connection area between the applicator and the outer shell, such as a threaded connection. Pressure on the outer shell is transmitted to the inner shell, causing the viscous material to be transferred from the inner shell to the applicator and then dispensed onto the substrate. As soon as the pressure on the outer shell is released, air is drawn back in from the outside through the connection area between the applicator and the outer shell into the intermediate space between the inner container and the outer shell, thereby releasing the pressure accumulated there and returning the outer shell to its original shape. However, no air enters the inner shell storing the viscous material, because the inner shell is sealed relative to the intermediate space between the outer shell and the inner shell by a sealing device (e.g., a sealing ring) arranged on the applicator according to the invention. The outer shell takes on its original shape after each coating process due to the inflow of air, while the inner container is further compressed and irreversibly deformed with each coating process.

[0011] An integrated venting system prevents air from being drawn into the inner container storing the adhesive material during metering and subsequent resetting of the outer casing. This eliminates the need to shake or "spike" the applicator before use and ensures that the adhesive material is applied to the substrate without air bubbles. Because the inner container deforms further with each application and this deformation is irreversible, the adhesive material does not move back into areas of the inner container from which it would first have to be moved backward toward the dispensing opening. In fact, the adhesive material is always immediately available in any orientation of the applicator, even in overhead applications, and can be reliably and without air bubbles dispensed. This results in significantly improved residual emptying. The appearance of the applicator is therefore consistently appealing to the user, as the outer casing always returns to its original shape while the increased deformation of the inner container remains invisible to the user. Furthermore, the absence of air entering the inner container also extends the durability of the adhesive material.

[0012] The applicator serves as a metering and shaping system and is connected to the housing. To connect the applicator and housing, the neck region of the housing may have external threads, and the applicator may have corresponding internal threads. The threaded connection may be designed as a right-hand thread, but it may also be designed, in particular, as a left-hand thread to counteract accidental unscrewing of the applicator from the housing by the user. In any case, the threaded connection is designed to be ventilated, thus allowing air to flow through the threads into the intermediate space between the inner container and the housing, and vice versa. A sealant contained in the applicator seals the internal volume of the inner container relative to these airflows.

[0013] The application apparatus according to the invention is equally suitable for the initial application of adhesive materials (e.g., sealants) to a substrate, and is applicable to the subsequent application of materials to existing materials that may require repair.

[0014] According to an embodiment of the invention, the annular gap designed between the insert of the inner container and the neck region of the outer casing has a gap width of 0.4 to 1 mm. This gap width is attributed to the halving of the difference between the inner diameter D1 of the neck region of the outer casing and the outer diameter D2 of the insert. This gap width ensures that when the outer casing is compressed, air can rapidly escape from the intermediate space between the outer casing and the inner container to the outside, and when the pressure on the outer casing is released, the air can flow back into the intermediate space from the outside just quickly. In this case, air is drawn into the intermediate space faster than any slight retraction of the viscous material from the applicator's dispensing opening, thus storing pressure equilibrium before the viscous material might slightly retract from the applicator's dispensing opening. In this way, air is prevented from entering the inner container.

[0015] The outer casing can have a bottle-shaped form. In this respect, the cross-section of the outer casing can be approximately rectangular, so that the front and rear actuating surfaces are designed to move toward each other in order to transmit pressure to the inner container.

[0016] According to an embodiment of the invention, the outer casing has a pleated fold that facilitates compression of the outer casing. The corrugated pleated fold promotes compression of the outer casing, allowing viscous material to be discharged from the inner container. According to a preferred embodiment, the pleated fold is thus designed so that compression of the outer casing occurs approximately perpendicular to the main flow direction of the viscous material. The main flow direction of the material is determined by the direction from the rear end of the inner container toward the discharge opening located at the opposite end of the inner container. By folding a region of the outer casing in a direction parallel to this main flow direction, the outer casing can be easily compressed in a direction perpendicular to the main flow direction. In this manner, one-handed operation of the applicator according to the invention is feasible, achieved by the user holding the outer casing between the thumb and at least one other finger of the same hand and compressing the outer casing (supported by the pleated fold) by moving the thumb and said at least one other finger toward each other without considerable force. The pressure applied to the outer casing is transmitted to the inner container, and the viscous material is transferred to the applicator, from where it is dispensed onto the substrate. The good compressibility of the outer casing promotes good residual evacuation.

[0017] The number of folds or pleats can be substantially varied, with a larger number of pleats contributing to the compression of the housing, but simultaneously associated with reduced strength and stability. In this respect, a trade-off must be found between good compressibility on the one hand and sufficient stability of the housing on the other. Generally, this trade-off is achieved by a number of pleats ranging from 3 to 7. The opening angle between two adjacent pleats can be approximately 30° to 55°.

[0018] According to one embodiment of the invention, the inner container is designed as a film bag. The film bag is generally highly flexible and therefore easily deformable, so that pressure applied to the outer casing can be easily and efficiently transferred to the film bag and the adhesive material stored therein. For example, the inner container can be designed from an aluminum-based film. The film material can be a laminate containing at least one aluminum layer. Such materials also have sufficient stability and strength to prevent the film bag from tearing and to prevent the adhesive material from accidentally escaping into the space between the inner container and the outer casing, even when force is applied, such as when the applicator is dropped from a certain height onto the ground. This is always of paramount importance because the user will not immediately notice any leakage of the film bag because the outer casing surrounds it. Finally, the aluminum laminate has the advantage of being substantially impermeable to moisture. In this way, water can be prevented from diffusing from the adhesive material through the bag wall, and the adhesive material can be prevented from solidifying while still in the applicator. This gives the product significantly improved storability. The schematic composite is constructed as a four-layer compound consisting of a PET layer, an aluminum layer, an OPA layer, and a PE layer.

[0019] Embodiments of the invention provide an inner container connected to an insert by welding, wherein the welded connection has a pressure tightness of up to at least 1.5 bar. The connection between the applicator and the inner container is thus designed to withstand forces (e.g., forces that occur when the applicator is dropped from a certain height to the ground), thereby preventing the applicator from detaching from the inner container and preventing viscous material from escaping into the intermediate space between the inner container and the outer casing. The insert itself can be manufactured from a thermoplastic material, for example, by injection molding.

[0020] In embodiments of the invention, the applicator includes a body and means for smoothing the applied viscous material and / or for cleaning adjacent substrate areas. For this purpose, Delta-shaped wings may be formed on the body of the applicator, the outer edges of which are used to smooth the applied material and clean adjacent substrate areas. The applicator may also include blades of a generally rectangular design having at least one smooth or clean edge. In this respect, the applicator may be configured to have at least two materials of different stiffnesses, wherein the body is made of a harder material, and the means for smoothing and / or cleaning is made of a less hard material. For example, the outer edges of the blades for smoothing and / or cleaning may be made of a flexible material, while the body of the applicator is made of a hard material (a material that is not easily bent), such as a thermoplastic elastomer. Using an applicator designed in this way, viscous material can be dispensed and formed in one operation by applying pressure to the housing and simultaneously pulling the applicator against the substrate, and excess material can be pulled off and collected from the substrate.

[0021] The present invention also relates to a method for manufacturing a coating apparatus according to any one of claims 1 to 9, comprising the following steps:

[0022] It provides an inner container and an insert connected to the inner container, an outer housing having a neck region and an opening, and an applicator;

[0023] The inner container is folded in a U-shape by directly stacking the left wing and the right wing of the inner container;

[0024] Insert the U-shaped folded inner container through the opening in the outer shell;

[0025] The insert of the inner container is latched to the neck region of the outer casing, forming an annular gap between the insert of the inner container and the neck region of the outer casing;

[0026] Fill the inner container with an adhesive material;

[0027] The applicator is applied to the housing and the applicator is joined to the housing, wherein the joint between the applicator and the housing is breathable, and the applicator seals the intermediate space between the housing and the inner container relative to the internal volume of the inner container.

[0028] If necessary, attach a protective cap to the applicator and latch the protective cap to the housing.

[0029] To insert the inner container into the outer casing, it is necessary to fold the inner container. The inner container unfolds again within the outer casing by filling it with an adhesive material. Important for the method according to the invention is the U-shaped fold of the inner container, such as a film pouch, in which the right and left wings of the inner container are positioned directly above and below each other. This distinguishes the U-shaped fold from the so-called Z-shaped fold, in which one lateral wing of the inner container is folded forward while the other lateral wing is folded backward. Compared to the Z-shaped fold, the U-shaped fold offers the advantages of significantly improved filling of the inner container with the adhesive material and more reliable unfolding, thus achieving a more uniform and complete filling of the inner container.

[0030] According to embodiments of the method, the housing of the coating apparatus can be manufactured from a thermoplastic elastomer in an injection blow molding process. The combined injection blow molding process is particularly suitable for forming housings with pleated sections. Attached Figure Description

[0031] In the following, the invention will be explained in more detail with the aid of illustrative examples and reference to the accompanying drawings. In the drawings:

[0032] Figure 1 An embodiment of the coating apparatus according to the present invention is shown in a perspective view;

[0033] Figure 2It shows Figure 1 The outer casing of the coating device;

[0034] Figure 3 It shows Figure 2 The side view of the outer casing shown;

[0035] Figure 4 The inner container of the coating device with an insert is shown;

[0036] Figure 5 It shows Figure 4 The contents are U-shaped and folded.

[0037] Figure 6 A view of the contents folded in a U-shape is shown from above;

[0038] Figure 7 It shows Figure 5 The contents of the container are in a partially expanded state;

[0039] Figure 8 An example of the insert is shown in a slanted view from below;

[0040] Figure 9 A schematic diagram showing the connection area of ​​the applicator, insert, and housing is provided.

[0041] Figure 10 An alternative embodiment of the applicator is shown in a perspective view;

[0042] Figure 11 A schematic cross-sectional view is shown of an insert that is latched in the neck region of the housing in a manner that forms an annular gap. Detailed Implementation

[0043] Figure 1 A coating apparatus, generally indicated by reference numeral 1, is shown for applying an adhesive material to a substrate. The coating apparatus 1 includes a housing 2 and an inner container 3, the inner container being... Figure 1 Not visible in the view, the inner container is arranged within the outer casing 2 and stores adhesive materials such as sealants. The inner container 3 will then be joined. Figures 4 to 7 To explain in more detail.

[0044] Furthermore, the coating device 1 includes an applicator 4, which is connected to the housing 2 via a threaded connection. The threaded connection between the applicator 4 and the housing 2 is designed to be ventilated. External pressure applied to the housing 2 is transmitted to the inner container 3, causing the viscous material to be transferred from the inner container 3 to the applicator 4 and then applied to the substrate. For this purpose, the applicator 4 has a dispensing opening 5 through which the viscous material can be discharged from the coating device 1.

[0045] Figure 2 and 3 It shows Figure 1 Two views of the outer housing 2 of the coating device 1. The housing 2 includes a neck region 6 with an opening 7, wherein the neck region 6 is generally designed as a hollow cylinder and has an inner diameter D1. The neck region 6 is provided with external threads 8 for screwing the housing 2 to the applicator 4 of the coating device 1. The external threads 8 are designed to be left-hand threads.

[0046] The outer casing 2 has a lamella fold 9 in the form of a bellows, wherein the lamellae 10 extend circumferentially, starting from the area below the neck region 6 of the outer casing 2, passing through the left side 11 of the outer casing 2, passing through the bottom side 12 of the outer casing 2, and passing through the right side 13, and turning back to the neck region 6. The lamella fold 9 facilitates the compression of the outer casing 2. For this purpose, the user can grasp the outer casing 2 with one hand between the thumb and at least one other finger and apply pressure to two opposite actuating surfaces 14 and 15, so that the two actuating surfaces 14 and 15 move toward each other.

[0047] In this respect, the folded portion 9 is designed such that the compression of the outer shell 2 occurs substantially perpendicular to the main flow direction of the viscous material in the application device 1. The main flow direction of the viscous material is... Figure 1 and 3 As indicated by arrow 16, it extends from the bottom 12 of the housing 2 toward the applicator 4 and the opening 7, respectively. Figure 3 In the diagram, the vertical direction of the compression of the outer shell 2 is also indicated by arrow 17. The embodiment shown has five pleats, wherein the opening angle α between two adjacent pleats is approximately 47°.

[0048] Figure 4 The inner container 3 of the coating device 2 is shown. The inner container 3 is designed as a thin-film bag, formed by sealing the edges of an aluminum laminate with a film thickness of approximately 100 μm. The inner container 3 is used to store the viscous material and has a dispensing opening 18. In the region of the dispensing opening 18, an insert 19 is hermetically connected to the inner container 3 by welding. The insert 19 is generally designed in a hollow cylindrical shape, which... Figure 6 and Figure 11 This can be seen more clearly in the image. The outer diameter D2 of the insert 19 is smaller than the inner diameter D1 of the neck region 6 of the outer casing 2, see also [reference needed]. Figure 11 Insert 19 is part of a ventilation device, which will be explained in more detail below.

[0049] exist Figure 1 In the coating device 1, the inner container 3 is arranged inside the outer casing 2. To be inserted into the outer casing 2, the inner container 3 is folded in a U-shape, which allows it to... Figure 5 and 6 As can be seen from this, for this purpose, the right wing 20 is first folded onto the central area of ​​the inner container 3, and then the left wing 21 of the inner container 3 is directly attached thereto. Figure 6 A top view shows the arrangement of the side wings 20 and 21 of the inner container 3 in a U-shaped folded state. In this state, the inner container 3 can be inserted through the opening 7 into the inner region of the outer shell 2. The inner container 3 is then filled with an adhesive material through the opening 18, causing it to gradually unfold, with the upper region of the inner container 3 unfolding first. Figure 7 As shown, these are in the lower region of the inner container 3 before it fully expands after further filling. Compared to other types of folds, the U-shaped fold results in a particularly reliable expansion of the inner container 3, achieving a more uniform and complete filling with the adhesive material.

[0050] The inner container 3, inserted into the outer casing 2, is connected to the outer casing 2 by a latching mechanism. For this purpose, the insert 19 connected to the inner container 2 has a latching device 22 on its outer side, see also, for example, see Figure 8 The latching device latches with the corresponding latching device on the inner side of the outer shell 2 in the insertion position of the inner container 3 within the outer shell 2. Due to the difference between the outer diameter D2 of the insert 19 and the inner diameter D1 of the neck region 6, the annular gap is designed in the insertion position of the insert 19 between the insert 19 and the neck region 6 of the outer shell 2, see... Figure 11 . Figure 11 It shows along Figure 5 The line AB shown passes through a top view of the cross-section of insert 19, which is inserted into the neck region 6 of the housing 2. The annular gap is shown here by shaded areas, but is not proportional. Air can flow through this annular gap into the intermediate space between the housing 2 and the inner container 3, and vice versa. In the illustrated embodiment, diameter D1 is approximately 19.3 mm, and diameter D2 is approximately 17.8 mm. The annular gap thus has a gap width of approximately 0.75 mm.

[0051] Figure 9A portion of the connection area between the applicator 4, the insert 9, and the neck region 6 of the housing 2 is shown in a schematic partial sectional view. The threaded connection between the applicator 4 and the neck region 6 of the housing 2 is permeable, allowing air to flow in from the outside along the direction indicated by arrow 23, through the threaded connection area, and ultimately into the intermediate space between the inner container 3 and the housing 2 via the annular gap between the insert 19 and the neck region 6 of the housing 2 (in the area indicated by arrow 24). Simultaneously, the applicator 4 has a sealing device 25, by means of which the internal volume of the inner container 3 (accessible via the dispensing opening 18) is sealed relative to the intermediate space between the housing 2 and the inner container 3. In other words, air can flow into the intermediate space between the housing 2 and the inner container 3, but air cannot flow into the inner container 3.

[0052] This venting device ensures that the viscous material is discharged from the application device 1 in a bubble-free and uniform manner. When the outer shell 2 is compressed by the user in the manner described above, the air located between the outer shell 2 and the inner container 3 first escapes through the annular gap between the neck region 6 of the outer shell 2 and the insert 19 of the inner container 3, and then flows to the outside through the breathable threaded connection between the applicator 4 and the outer shell 2. The pressure on the outer shell 2 is transmitted to the inner container 3, causing the viscous material to be transferred from the inner shell 3 to the applicator 4 and distributed onto the substrate through the applicator's dispensing opening 5. As soon as the pressure on the outer shell 2 is released, air is drawn back from the outside through the intermediate space between the applicator 4 and the outer shell 2 into the intermediate space between the inner container 3 and the outer shell 2, thereby releasing the negative pressure accumulated there and returning the outer shell 2 to its original shape. However, no air enters the inner container 3, which stores the viscous material, because it is sealed relative to the intermediate space between the outer shell 2 and the inner container 3 by the sealing device 25 arranged on the applicator 4. The outer shell 2 thus takes on its initial shape after each coating process due to the inflow of air, while the inner container 3 is further compressed and irreversibly deformed with each coating process.

[0053] An integrated venting device prevents air from being drawn into the inner container 3, which stores the adhesive material, during the metering and subsequent resetting of the outer casing 2. This eliminates the need to shake or “taps” the applicator 1 before use and ensures that the adhesive material is applied to the substrate without air bubbles. Because the inner container 3 deforms further with each application and this deformation is irreversible, the adhesive material cannot return to such an area of ​​the inner container 3 from which it must first move back toward the dispensing opening 18. In effect, the adhesive material is always immediately available in any orientation of the applicator 1 and can be reliably and without air bubbles dispensed. This also achieves significantly improved residual emptying. The appearance of the applicator 1 is therefore consistently appealing to the user, as the outer casing 2 always returns to its original shape, and the deformed inner container 3 is not visible to the user.

[0054] Figure 10 An alternative embodiment of the applicator 4 is shown. (Compared to...) Figure 1 Compared to the applicator 4 in the middle, which has a roughly rectangular shape, Figure 10 The applicator 4 is designed in a Delta shape (triangular or conical). Figure 1 and 4 The outer edges 226, 27, 28, and 29 of the applicator 4 are used as tools for smoothing the applied viscous material and as tools for cleaning adjacent substrate areas, respectively. In this case, the body 30 of the applicator 4 is made of a harder material than the tools used for smoothing and cleaning, which are made of a flexible material.

Claims

1. A coating apparatus (1) for applying an adhesive material to a substrate, comprising a inner container (3) having a dispensing opening (18) for receiving the adhesive material, an outer shell (2) surrounding the inner container (3) and including a generally hollow cylindrical neck region (6) having an inner diameter D1 and an opening (7) designed in the neck region (6), and an applicator (4) connected to the outer shell (2), wherein, The adhesive material can be transferred from the inner container (3) to the applicator (4) by pressure on the outer shell (2) and applied to the substrate by the applicator. The applicator (1) is characterized by having a venting device comprising an insert (19) that is airtightly connected to the inner container (3) in the region of the dispensing opening (18) and is generally designed as a hollow cylinder with an outer diameter D2, wherein the outer diameter D2 of the insert (19) is smaller than the inner diameter D1 of the neck region (6) of the outer shell (2), and wherein the insert (19) has a latching device (22) on its outer side, by means of which the insert is latched in the neck region of the outer shell (2). In the insertion position of the insert (19), an annular gap is designed between the neck region (6) of the insert (19) and the outer shell (2) due to different diameters D1 and D2. Through the annular gap, air can flow from the outside into the intermediate space between the outer shell (2) and the inner container (3) and vice versa. Furthermore, the connection between the applicator (4) and the outer shell (2) is designed to be breathable. The applicator (4) includes a sealing device (25) by means of which, in the use position of the applicator (4), the internal volume of the inner container (3) is provided with airtightness and leak-proof sealing relative to the intermediate space between the outer shell (2) and the inner container (3).

2. The coating device (1) according to claim 1, characterized in that, The annular gap has a gap width of 0.4 to 1 mm.

3. The coating device (1) according to claim 1 or 2, characterized in that, The outer shell (2) has a pleated fold (9) which facilitates the compression of the outer shell (2).

4. The coating device (1) according to claim 3, characterized in that, The folded portion (9) is designed such that the compression of the outer shell (2) occurs approximately in a direction perpendicular to the main flow direction of the viscous material.

5. The coating apparatus (1) according to claim 1 or 2, characterized in that, The inner container (3) is designed as a thin film bag.

6. The coating apparatus (1) according to claim 5, characterized in that, The inner container (3) is made of aluminum-based thin film.

7. The coating apparatus (1) according to claim 1 or 2, characterized in that, The inner container (3) is connected to the insert (19) by welding, wherein the welded connection has a pressure tightness of up to at least 1.5 bar.

8. The coating apparatus (1) according to claim 1 or 2, characterized in that, The applicator (4) includes a body (30) and tools (26, 29) for smoothing the applied viscous material and / or tools (27, 28) for cleaning adjacent substrate areas.

9. The coating apparatus (1) according to claim 8, characterized in that, The applicator (4) has at least two materials with different hardnesses, wherein the body (30) is made of a material that is harder than the tool used for smoothing and / or the tool used for cleaning (26, 27, 28, 29).

10. A method for manufacturing a coating apparatus (1) according to any one of claims 1 to 9, comprising the following steps: Provides an inner container (3) and an insert (19) connected to the inner container (3), an outer shell (2) having a neck region (6) and an opening (7), and an applicator (4); The inner container (3) is folded in a U-shape by directly stacking the left wing (21) of the inner container (3) and the right wing (20) of the inner container (1). Insert the U-shaped folded inner container (3) into the opening (7) through the outer shell (2); The insert (19) of the inner container (3) is latched to the neck region (6) of the outer shell (2), forming an annular gap between the insert (19) of the inner container (3) and the neck region (6) of the outer shell (2); Fill the inner container with an adhesive material (3); The applicator (4) is applied to the outer shell (2) and the applicator (4) and the outer shell (2) are connected, wherein the connection between the applicator (4) and the outer shell (2) is breathable, and the applicator (4) seals the intermediate space between the outer shell (2) and the inner container (3) relative to the internal volume of the inner container (3).

11. The method according to claim 10, characterized in that, Place a protective cap on the applicator (4) and latch the protective cap to the outer casing (2).

12. The method according to claim 11, characterized in that, The outer shell (2) is manufactured from thermoplastic elastomer by injection blow molding process.

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