Heated hose for the delivery of liquids, in particular for the delivery of adhesives

Abstract

This invention relates to a heated hose (1) for conveying liquids, particularly adhesives. The heated hose comprises: a flexible hose (2) for conveying the liquid; an insulating layer surrounding the flexible hose (2); and a heating mechanism (3) surrounding the flexible hose (2), wherein the heating mechanism (3) is disposed between the flexible hose (2) and the insulating layer. The insulating layer comprises a strip of insulating material (4), wherein the strip of insulating material (4) is spirally wound around the flexible hose (2). The strip of insulating material (4) has an aerogel.

Description

Technical Field

[0001] This invention relates to a heated hose for conveying liquids, particularly adhesives. The adhesive is preferably a hot melt adhesive. The heated hose according to the invention is particularly used for transporting or conveying liquid hot melt adhesives or other materials that are flowable in a hot state from a melting device to a coating head. The heated hose is particularly used for connection to a melting device used to melt hot melt adhesives that are solid at room temperature. The hot melt adhesive is then conveyed through the heated hose to a coating point, typically to a coating head, where the adhesive is applied to a substrate surface, either at the coating point or by means of the coating head. The heated hose is particularly used for maintaining the liquid to be conveyed in the heated hose within a specific temperature range and / or heating the liquid to be conveyed in the heated hose to a specific target temperature or a specific target temperature range. Background Technology

[0002] Heated hoses for conveying liquids, particularly adhesives, are known from published document US 2003 / 0007789A1. The heated hoses known from the aforementioned published document possess the following characteristics:

[0003] Flexible hoses used for conveying liquids.

[0004] The insulation layer surrounding the flexible hose.

[0005] A heating mechanism enclosing the flexible hose, wherein the heating mechanism is disposed between the flexible hose and the insulation layer. The insulation layer has a strip of insulation material, wherein the strip of insulation material is spirally wound around the flexible hose. Summary of the Invention

[0006] The objective of this invention is to achieve particularly low heat loss in the heating hose with the smallest possible radial extension, i.e., thickness.

[0007] This task is solved by a heating hose having: a flexible hose for conveying liquid, an insulation layer surrounding the flexible hose, and a heating mechanism surrounding the flexible hose, wherein the heating mechanism is arranged between the flexible hose and the insulation layer, wherein the insulation layer comprises a strip of insulation material, wherein the strip of insulation material is helically wound around the flexible hose, wherein the strip of insulation material has an aerogel, and wherein, when the flexible hose is bent, the helically wound strands of insulation material are movable relative to each other therein, the strip of insulation material is wound around the flexible hose such that the strip of insulation material is adjacent to the radially outer side of the heating mechanism.

[0008] According to the present invention, the strip-shaped thermal insulation material has an aerogel.

[0009] Aerogels are highly porous solids with numerous pores. A key feature of aerogels is their exceptionally low thermal conductivity.

[0010] Due to the exceptionally low thermal conductivity of the aerogel, the strip-shaped insulation material also exhibits exceptionally low thermal conductivity, enabling the strip-shaped insulation material to have a relatively small thickness while still achieving exceptionally good insulation performance for the flexible hose.

[0011] Aerogels, or conventional aerogel-containing materials, are characterized by their susceptibility to damage under mechanical stress and their tendency to generate dust. This damage negatively impacts insulation performance. Furthermore, it poses a risk of abrasive particles and / or dust entering the environment, potentially causing undesirable contamination of the liquid to be treated and / or the substrate to which it should be coated. Conversely, it is advantageous to avoid dust generation during the manufacture of the heating hose, thereby eliminating the need for otherwise necessary protective measures such as suction devices, masks, etc.

[0012] The strip-shaped insulation material comprises aerogel and is spirally wound around a flexible hose. The use of this strip-shaped insulation material has proven advantageous because it allows for relative movement of the windings when the heating hose is subjected to mechanical loads, such as bending of the heating hose, thereby reducing localized tensile and compressive loads on the insulation material. This avoids or at least reduces abrasion and / or dust accumulation of the aerogel contained in the insulation material.

[0013] The concept of "spiral" here does not necessarily refer to a winding with a constant lead angle (Gangwinkel). However, windings with a constant lead angle are considered particularly advantageous.

[0014] It has proven advantageous, given the particularly good and as constant as possible insulation along the length of the hose, that the strip of insulation material is self-overlapping around the flexible hose. Preferably, the overlap is 20% to 50%, more preferably 40% to 50%, and especially 45% to 50% of the width of the strip of insulation material. An overlap of approximately 50% is considered particularly advantageous. For an overlap of approximately 50%, the thickness of the insulation layer is approximately twice the thickness of the strip of insulation material. During the bending motion of the heating hose, the insulation material is stretched and upset to a lesser extent, especially compared to tubular insulation material, and furthermore, the winding layers can slide slightly against each other, thus avoiding gaps in the insulation layer in the bending areas, even for a bent heating hose.

[0015] The particularly high mechanical stability of the insulation material and the exceptionally easy and rapid processing of the insulation material to form the insulation layer have proven advantageous, especially given that the strip insulation material has a width of 15 mm to 60 mm.

[0016] The strip-shaped insulation material has a thickness of preferably 0.5 mm to 6.0 mm, especially 2 mm to 5 mm, and more preferably 1 mm to 3 mm.

[0017] Preferably, the ratio of the thickness of the insulation material to the width of the insulation material is between 1 / 30 and 1 / 6.

[0018] The aerogel is particularly a silicon-based aerogel.

[0019] The insulation material is, in particular, non-woven fabric.

[0020] To achieve particularly good mechanical stability, it is considered advantageous for the insulation material to have a support structure. This support structure is particularly fiber-based. Specifically, the support structure can comprise polyester fibers and / or glass fibers.

[0021] To avoid or at least reduce damage to the insulation material and / or dust release during processing or when the insulation material is subjected to mechanical loads, such as when bending the heating hose, it is considered particularly advantageous that the insulation material has a coating, especially a dust-proof or dust-repellent coating. To achieve particularly good sliding of the windings, for example, when bending the heating hose, it is considered advantageous that the coating is a friction-reducing coating.

[0022] The coating is particularly based on silicon and / or polyurethane. In particular, the coating is a silicon coating or a polyurethane coating.

[0023] Furthermore, it is entirely possible to consider providing a shell of the strip-shaped insulating material as a supplement to or alternative to the coating. The shell could, for example, be a shell made of a plastic film. Paper-like materials, especially coated paper-like materials, such as materials in the form of a baked-on release film, could also be considered for the shell. Preferably, the shell surrounds the insulating material but is not attached to it.

[0024] In a particularly advantageous embodiment, the heating hose is provided with a preferably dustproof covering layer, wherein the covering layer directly surrounds the insulation layer. This design is particularly advantageous in preventing dust generation due to mechanical stress on the insulation material during the manufacture of the heating hose. Furthermore, the covering layer is considered particularly advantageous so that the additional layer of the heating hose surrounding the insulation layer does not directly contact the insulation layer, thereby preventing damage to the insulation material or the insulation layer.

[0025] The covering layer is, in particular, a strip-shaped covering material, which is spirally wound around the insulation layer, preferably self-overlapping. The strip-shaped covering material can be, in particular, a woven tape or a fiberglass-fabric tape. The strip-shaped covering material can also be a covering material with an adhesive layer. Preferably, the adhesive layer is configured such that it does not adhere to the insulation material, so that only the self-adhesion of the covering material occurs in the self-overlapping areas.

[0026] In a particularly preferred embodiment of the heating hose, the heating hose has control lines and / or electrical supply lines, wherein the control lines and / or electrical supply lines can be connected to components of the delivery mechanism and / or coating mechanism that work in conjunction with the heating hose. The integration of the electrical supply lines and / or control lines into the heating hose has the advantage that the lines do not need to be separately routed to the components that work in conjunction with the heating hose. This allows for easy and straightforward installation with minimal error bias. It also improves personnel safety in manual applications because the number of connecting lines can be kept particularly low in such an embodiment.

[0027] In conjunction with the integrated control and / or electrical supply lines, it is considered particularly advantageous that the heating hose has a connection structure, wherein the connection structure is connected to the control and / or electrical supply lines and can be connected to a corresponding mating structure of the component. This allows for particularly easy operation, especially installation of the heating hose. The connection structure is specifically configured as a plug and the mating structure as a socket, or vice versa.

[0028] It is particularly advantageous that the control lines and / or the electrical supply lines are spirally wound around the insulation layer, especially that the control lines and / or the electrical supply lines are spirally wound around the covering layer.

[0029] In a particularly preferred embodiment, the heating hose has a preferably sealed outer jacket. This jacket is, in particular, made of silicone, polyurethane, or polyethylene. Preferably, the jacket is constructed in such a way that water is prevented from entering the internal areas of the heating hose. Regarding the cleaning of the outer jacket of the heating hose, it is considered particularly advantageous that the jacket is constructed with a smooth structure. This allows for particularly easy cleaning or washing of the jacket. Furthermore, it is considered particularly advantageous that the jacket is made of an electrically insulating material or is electrically insulating.

[0030] Preferably, the outer casing is an extruded silicone tube or a foamed silicone tube.

[0031] Preferably, the outer jacket is inserted into the rest of the heating hose.

[0032] To achieve particularly good sliding effect of the jacket on the rest of the heating hose when inserting the jacket and / or bending the heating hose, it is considered particularly advantageous that the inner surface of the jacket is configured to have a particularly low coefficient of friction. This can be achieved, for example, by sprinkling talcum powder on the inner surface of the jacket.

[0033] Furthermore, it is considered particularly advantageous that the inner diameter of the outer jacket is slightly larger than the outer diameter of the layer of the heating hose adjacent to the outer jacket.

[0034] It is considered particularly advantageous that the winding direction of the covering material and / or the winding direction of the control circuit and / or the winding direction of the electrical supply circuit and / or the winding direction of the heating mechanism corresponds to the winding direction of the insulation material. Preferably, all the helical components of the heating hose wound around the flexible hose have the same winding direction. Such a design has proven advantageous in terms of the good flexibility of the heating hose when the individual components are subjected to particularly small mechanical loads.

[0035] In one advantageous extension of the heating hose, the lead angle of the winding of the strip of insulating material is specified to be between 5° and 30°, preferably between 10° and 15°.

[0036] The flexible hose, especially the high-pressure hose.

[0037] Preferably, the flexible hose has an inner core made of PTFE. However, it is also entirely possible for the inner core to be made of other fluoroplastics.

[0038] Preferably, the flexible hose has an outer armor made of metal mesh, particularly steel strand mesh. Regarding the armor, it is entirely possible to use aramid mesh instead of steel strand mesh or metal strand mesh.

[0039] In a preferred embodiment, the inner core of the flexible hose is formed of a corrugated metal hose. The corrugated metal hose can be corrugated in parallel or in a spiral pattern. Furthermore, it is entirely possible that the inner core, in the form of a corrugated metal hose, is surrounded by an outer layer of armor, particularly the type of armor mentioned above.

[0040] The heating mechanism is particularly a resistance heating mechanism having at least one heating wire.

[0041] It is entirely possible to consider that the heating hose additionally includes a temperature sensor, wherein the temperature sensor is preferably arranged between the insulation layer and the flexible hose.

[0042] The heating hose is preferably designed to maintain or heat the liquid to be transported to a temperature range of 80°C to 230°C, especially 120°C to 200°C. Attached Figure Description

[0043] The invention will be explained in detail with reference to one embodiment in the following figures, but is not limited to that embodiment. Wherein:

[0044] Figure 1 One embodiment of the heating hose is shown in cross-sectional view;

[0045] Figure 2 The perspective view shows the following according to Figure 1 The heating hose is in the middle stage of manufacturing the heating hose. Detailed Implementation

[0046] Figure 1 and 2 A heated hose 1 is shown for conveying liquids, here used for conveying adhesives, wherein Figure 2 The diagram shows the heating hose 1 in an intermediate stage of its manufacturing process, thereby... Figure 2 The diagram shows the heating hose 1 in an incomplete state.

[0047] The heating hose 1 has a flexible hose 2 for conveying liquid. The flexible hose 2 is surrounded by a heating mechanism 3, which comprises two heating wires spirally wound around the flexible hose 2, one end of one heating wire connected to the end of the other heating wire. In such a design with heating wires connected to each other at their ends, it is possible that the energy supply mechanism of the heating mechanism 3 is connected only to one end of the heating hose 1. It is considered particularly advantageous that the respective heating wires are surrounded by an electrical insulator. The electrical insulator can be, for example, a PTFE coating or a silicon coating, or a sheath made of PTFE or a sheath made of silicon. However, PTFE is preferred.

[0048] Furthermore, the heating hose 1 has an insulation layer surrounding the flexible hose 2 and the heating mechanism 3, wherein the insulation layer is formed by a strip of insulation material 4, wherein the strip of insulation material 4 is spirally and self-overlappingly wound around the flexible hose 2 and the heating mechanism 3, wherein the overlap is approximately 50% of the width B of the strip of insulation material 4. The strip of insulation material 4 has an aerogel.

[0049] Furthermore, the heating hose 1 has a dustproof or at least dust-reducing cover layer 5, wherein the cover layer 5 directly surrounds the insulation layer. Additionally, the heating hose 1 includes multiple control lines 6 and multiple electrical supply lines 7, wherein the multiple control lines 6 and multiple electrical supply lines 7 are spirally wound around the cover layer 5.

[0050] The heating hose 1 has an outer sleeve 8, which surrounds the control circuit 6 and the electrical supply circuit 7 and seals the inner components of the heating hose 1 relative to the environment.

[0051] At one end, the heating hose 1 has a connection structure 9 for establishing a fluid connection between the heating hose 1 and other components of the coating mechanism and / or delivery mechanism and / or melting mechanism. To prevent dust and / or liquid from entering the interior of the heating hose 1 in the area of ​​the connection structure 9, the heating hose 1 has an end cap 10 at one end, thereby in the area of ​​the connection structure 9, which surrounds the connection structure 9, and the end cap 10 also surrounds a portion of the end side of the outer jacket 8.

[0052] It is entirely possible to consider that the heating hose 1 additionally includes a temperature sensor, wherein the temperature sensor is preferably arranged between the insulation layer and the flexible hose 2.

[0053] For example, especially from Figure 1As is known from the text, all the components of the heating hose 1 that are spirally wound around the flexible hose 2 have the same winding direction.

[0054] List of reference numerals in the attached diagram:

[0055] 1. Heating hose

[0056] 2. Flexible hose

[0057] 3 Heating mechanism

[0058] 4. Thermal insulation materials

[0059] 5. Covering layer

[0060] 6. Control circuit

[0061] 7. Supply Line

[0062] 8. Coat

[0063] 9. Connection Structure

[0064] 10 End Caps

[0065] B is the width.

Claims

1. A heating hose (1) for conveying liquid, comprising: Flexible hose for conveying liquid (2). The insulation layer surrounding the flexible hose (2) A heating mechanism (3) surrounding the flexible hose (2), wherein the heating mechanism (3) is arranged between the flexible hose (2) and the insulation layer. The insulation layer comprises a strip of insulation material (4), wherein the strip of insulation material (4) is spirally wound around the flexible hose (2), characterized in that, The strip-shaped insulation material (4) has an aerogel, wherein when the flexible hose is bent, the spirally wound insulation material is movable relative to each other, wherein the strip-shaped insulation material (4) is wound around the flexible hose (2) such that the strip-shaped insulation material (4) is adjacent to the radial outside of the heating mechanism (3).

2. The heating hose according to claim 1, wherein the strip-shaped insulation material (4) has a width (B) of 15 mm to 60 mm and / or the strip-shaped insulation material (4) has a thickness of 1 mm to 3 mm.

3. The heating hose according to claim 1 or 2, wherein the strip of insulating material (4) is self-overlapping around the flexible hose (2).

4. The heating hose according to claim 1 or 2, wherein the aerogel is a silicate-based aerogel.

5. The heating hose according to claim 1 or 2, wherein the insulation material (4) has a support structure.

6. The heating hose according to claim 1 or 2, wherein the strip-shaped insulating material (4) has a coating.

7. The heating hose of claim 6, wherein the coating is a silicone and / or polyurethane-based coating.

8. The heating hose according to claim 1 or 2, wherein the strip-shaped insulating material (4) has a shell.

9. The heating hose according to claim 1 or 2, wherein the heating hose (1) has a covering layer (5), wherein the covering layer (5) directly surrounds the insulation layer.

10. The heating hose according to claim 9, wherein the covering layer (5) comprises a strip of covering material, wherein the strip of covering material is spirally wound around the insulation layer.

11. The heating hose according to claim 10, wherein the heating hose (1) includes a control line (6) and / or an electrical supply line (7), wherein the control line (6) and / or the electrical supply line (7) are connectable to components of the delivery mechanism and / or coating mechanism that work together with the heating hose (1).

12. The heating hose according to claim 11, wherein the control line (6) and / or the electrical supply line (7) are spirally wound around the insulation layer.

13. The heating hose according to claim 1 or 2, wherein the heating hose (1) has an outer jacket (8).

14. The heating hose according to claim 10, wherein the winding direction of the covering material (5) and / or the winding direction of the control line (6) and / or the winding direction of the electrical supply line (7) and / or the winding direction of the heating mechanism (3) corresponds to the winding direction of the insulating material (4).

15. The heating hose according to claim 1 or 2, wherein the lead angle of the winding of the strip-shaped insulating material (4) is between 5° and 30°.

16. The heating hose of claim 1, wherein the heating hose (1) is configured for delivering adhesive.

17. The heating hose according to claim 3, wherein the overlap is 20% to 50% of the width of the strip of insulating material (4).

18. The heating hose according to claim 3, wherein the overlap is 40% to 50% of the width of the strip of insulating material (4).

19. The heating hose according to claim 3, wherein the overlap is 45% to 50% of the width of the strip of insulating material (4).

20. The heating hose according to claim 5, wherein the insulation material (4) has a fiber-based support structure.

21. The heating hose according to claim 6, wherein the strip-shaped insulating material (4) has a friction-reducing coating and / or a dust-proof coating.

22. The heating hose of claim 7, wherein the coating is a silicon coating or a polyurethane coating.

23. The heating hose of claim 10, wherein the strip-shaped covering material is self-overlapping around the insulation layer.

24. The heating hose according to claim 11, wherein the heating hose (1) has a connection structure, wherein the connection structure is connected to the control line and / or the power supply line, wherein the connection structure is capable of being connected to a corresponding mating structure of the component.

25. The heating hose according to claim 12, wherein the control line (6) and / or the electrical supply line (7) are spirally wound around the cover layer (5).

26. The heating hose of claim 13, wherein the outer jacket (8) is made of silicone and / or polyurethane and / or polyethylene, or is made of silicone or polyurethane or polyethylene.

27. The heating hose according to claim 14, wherein all the spiral components of the heating hose (1) that are wound around the flexible hose (2) have the same winding direction.

28. The heating hose according to claim 15, wherein the lead angle of the winding of the strip insulation material (4) is between 10° and 15°.

29. The heating hose according to claim 15, wherein the lead angle of the winding of the strip-shaped insulating material (4) is 15°.

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