Heated hoses for transporting liquids, especially adhesives

Abstract

To particularly reduce heat loss of a heat hose by a radial expansion as minimum as possible of the heat hose, that is, by a thickness thereof.SOLUTION: The present invention is related to a heat hose (1) for transferring liquid, in particular an adhesive agent. The heat hose includes a flexible hose (2) through which the liquid passes; a heat insulation layer surrounding the flexible hose (2); and a heat device (3) surrounding the flexible hose (2). The heat device (3) is provided between the flexible hose (2) and the heat insulation layer. The heat insulation layer includes a band-like heat insulation material (4), and the band-like heat insulation material (4) is spirally wound about the flexible hose (2). The band-like heat insulation material (4) includes an aerogel.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a heated hose for transporting liquids, particularly adhesives. The adhesive is preferably a hot melt adhesive. The heated hose of the present invention is particularly useful for transporting or conveying liquid hot melt adhesives or other materials capable of flowing at elevated temperatures from a melting device to an application head. The heated hose is particularly used for connecting to a melting device, whereby the melting device is used to melt hot melt adhesives that are solid at room temperature. The heated hose is used to transport the hot melt to an application point, typically an application head, where the adhesive is applied to a substrate. The heated hose is particularly useful for maintaining the liquid conveyed within the heated hose within a predetermined temperature range and / or for heating the liquid conveyed within the heated hose to a predetermined set temperature or a predetermined set temperature range. [Background technology]

[0002] A heated hose having the features of the general terms of claim 1 is known from patent application WO 02 / 04999. The heated hose known from said publication has the following features: Flexible hose for passing liquids, A thermal insulation layer surrounding the flexible hose, a heating device surrounding the flexible hose, the heating device being disposed between the flexible hose and the insulating layer; The insulating layer comprises a strip of insulating material, whereby the strip of insulating material is spirally wound around the flexible hose. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] US Patent Application Publication No. 2003 / 0070789 Summary of the Invention [Problem to be solved by the invention]

[0004] The object of the present invention is to achieve particularly low heat losses in a heated hose with the smallest possible radial expansion, i.e. thickness, of the heated hose. [Means for solving the problem]

[0005] This problem is solved by a heated hose having the features of claim 1.

[0006] According to the invention, it is contemplated that the insulation strip comprises an aerogel.

[0007] Aerogel is a highly porous solid with numerous pores and is characterized by particularly low thermal conductivity. [Effects of the Invention]

[0008] Due to the particularly low thermal conductivity of the aerogel, the insulating strip also has a particularly low thermal conductivity, so that the insulating strip can achieve particularly good insulation of the flexible hose even if it has a relatively low thickness.

[0009] Aerogels and materials containing conventional aerogels have the peculiarity that they are easily damaged and prone to dust generation when subjected to mechanical stress. On the one hand, this damage has a negative impact on the thermal insulation effect. On the other hand, there is a risk of abrasion and / or the release of dust into the environment, which can lead to, for example, undesirable contamination of the liquid to be treated and / or the substrate to which the liquid is to be applied. Furthermore, it would be advantageous to avoid the generation of dust during the production of heated hoses in order to save on otherwise necessary protective measures, such as exhaust systems, masks, etc.

[0010] The use of a strip of insulation containing aerogel wound in a spiral around a flexible hose has proven advantageous, since mechanical stress on the heating hose, for example in the form of bending the heating hose, can cause the windings to shift relative to one another, thereby reducing local tensile and compressive stresses in the insulation of the insulating layer, thereby preventing or at least reducing wear and / or dust generation of the aerogel contained in the insulation.

[0011] The term "helical" is not used herein to describe winding at a constant pitch angle, although winding at a constant pitch angle is considered particularly advantageous.

[0012] For particularly good insulation, which is as consistent as possible over the length of the hose, it has proven advantageous if the insulation strip is wrapped around the flexible hose in a self-overlapping manner. The overlap based on the width of the insulation strip is preferably 20% to 50%, more preferably 40% to 50%, and particularly preferably 45% to 50%. An overlap of approximately 50% is considered particularly advantageous. With an overlap of approximately 50%, the thickness of the insulation layer is approximately twice the thickness of the insulation strip. During bending movements of the heated hose, the wrapping results in less stretching and compression of the insulation, especially compared to pipe-shaped insulation. Furthermore, since the wrapping layers can slide somewhat between themselves, gaps in the insulation layer in the bent areas are avoided, even when the heated hose is installed in a bent position.

[0013] With regard to the particularly high mechanical stability of the insulation material and the particularly simple and rapid processing of the insulation material for the purpose of forming the insulation layer, it has proven advantageous if the strip insulation material has a width of 15 mm to 60 mm.

[0014] The strip-shaped heat insulating material preferably has a thickness of 0.5 mm to 6.0 mm, particularly 2 mm to 5 mm, and more preferably 1 mm to 3 mm.

[0015] Preferably, the ratio of the thickness of the heat insulating material to the width of the heat insulating material is 1 / 30 to 1 / 6.

[0016] The aerogels are especially silicate-based aerogels.

[0017] The insulating material is in particular a fleece.

[0018] To achieve particularly good mechanical stability of the insulation, it is considered advantageous if the insulation has a support structure, in particular a fiber-based support structure, such as polyester fibers and / or glass fibers.

[0019] In order to avoid or at least reduce damage to the insulation and / or dust release during handling or mechanical stress on the insulation, for example when the heating hose is bent, it is considered particularly advantageous if the insulation has a coating, in particular a dust-proof or dust-retaining coating. In order to achieve particularly good sliding of the winding, for example when the heating hose is bent, it is considered particularly advantageous if the coating is a friction-reducing coating.

[0020] The coating is in particular a silicone and / or polyurethane based coating, in particular a silicone coating or a polyurethane coating.

[0021] Furthermore, it is fully contemplated that the insulation strip may be provided with an outer covering in addition to or instead of a coating. The outer covering may be, for example, a plastic film outer covering. Paper-like materials are also contemplated for the outer covering, particularly coated paper-like materials, for example in the form of a baked release film. Preferably, the outer covering surrounds the insulation without adhering to it.

[0022] In a particularly advantageous design, the heated hose is preferably provided with a dust-proof cover layer, whereby the cover layer directly surrounds the insulating layer. Such a design is considered advantageous, in particular with regard to avoiding the formation of dust due to mechanical stress on the insulating material during the manufacturing of the heated hose. Furthermore, the cover layer is considered particularly advantageous in that further layers of the heated hose surrounding the insulating layer are not in direct contact with the insulating layer, thereby avoiding damage to the insulating material or the insulating layer.

[0023] The covering layer is in particular a strip of covering material, which is wound spirally around the insulating layer and preferably self-overlaps around the insulating layer. The covering material strip may in particular be a woven tape or a woven glass fiber tape. The covering material strip may in particular be a covering material having an adhesive layer. Preferably, the adhesive layer is designed not to adhere to the insulating material, so that only self-adhesion of the masking material occurs in the self-overlap area.

[0024] In a particularly preferred design of the heated hose, the heated hose has control lines and / or electrical supply lines that can be connected to components of the delivery device and / or application device that interact with the heated hose. Integrating the electrical supply lines and / or control lines into the heated hose has the advantage that these lines do not need to be routed separately to components that interact with the heated hose. This results in a simpler, clearer installation that is less prone to errors. In manual applications, this type of design requires a particularly small number of connecting lines, which increases personal safety.

[0025] For connection to integrated control and / or electrical supply lines, it is considered particularly advantageous if the heating hose has a connection structure, which can be connected to the control and / or electrical supply lines and which can be connected to a corresponding counter-structure of the component. This makes handling, and in particular the installation of the heating hose, particularly easy. The connection structure is in particular designed as a plug and the counter-structure as a socket, or vice versa.

[0026] With regard to the control lines and / or electrical supply lines, it is considered to be particularly advantageous if these are wound spirally around the insulating layer, in particular if the control lines and / or electrical supply lines are wound spirally around the cover layer.

[0027] In a particularly preferred design, the heated hose has a preferably closed outer sheath. The outer cover is in particular made of silicone, polyurethane or polyethylene. Preferably, the outer cover is designed to prevent water from penetrating into the inner region of the heated hose. It is considered particularly advantageous for cleaning the outer cover of the heated hose if the outer cover is smooth. This makes cleaning and washing the outer cover particularly easy. It is also considered particularly advantageous if the outer cover is made of an electrically insulating material or is electrically insulating.

[0028] The outer cover can be cleaned or washed.Furthermore, it is considered particularly advantageous if the outer cover is made of an electrically insulating material or is electrically insulating.

[0029] Preferably, the outer cover is an extruded or foamed silicone tubing.

[0030] Preferably, the outer cover is pressed onto the other components of the heated hose.

[0031] It is considered particularly advantageous if the inner surface of the outer cover is designed to have a particularly low coefficient of friction in order to improve sliding of the outer cover over other components of the heated hose when the outer cover is pressed down and / or when the heated hose is bent, which can be achieved, for example, by coating the inner surface of the outer cover with talc.

[0032] Furthermore, it is considered particularly advantageous if the inner diameter of the outer cover is slightly larger than the outer diameter of the layer of heated hose adjacent to the outer cover.

[0033] It is considered particularly advantageous if the wrapping direction of the cover material, the wrapping direction of the control cables, the wrapping direction of the electrical supply cables, and / or the wrapping direction of the heating device correspond to the wrapping direction of the insulation. Preferably, all components of the heating hose spirally wound around the flexible hose have the same wrapping direction. This design proves advantageous in terms of the heating hose's good flexibility, which results in particularly low mechanical stresses on the individual components.

[0034] In an advantageous further design of the heated hose, it is provided that the pitch angle of the windings of the insulating strip is between 5° and 30°, preferably between 10° and 15°.

[0035] The flexible hose is in particular a high-pressure hose.

[0036] Preferably, the flexible hose has an inner core of PTFE, although it is fully contemplated that the inner core may be made from another fluoroplastic.

[0037] Preferably, the flexible hose has an external reinforcement made of a metal braid, in particular a steel braid, although it is entirely conceivable to use an aramid fiber braid instead of a steel or metal braid.

[0038] In a preferred design, the inner core of the flexible hose is formed by a corrugated metal hose, which may be parallel corrugated or spiral corrugated. Furthermore, it is quite conceivable that the inner core in the form of a corrugated metal hose is in turn surrounded by an external reinforcement, in particular of the type mentioned above.

[0039] The heating device is in particular a resistive heating device having at least one heating wire.

[0040] It is fully contemplated that the heated hose further comprises a temperature sensor, whereby the temperature sensor is preferably located between the insulating layer and the flexible hose.

[0041] The heated hose is preferably designed to maintain or heat the liquid being conveyed at a temperature in the range of 80°C to 230°C, especially 120°C to 200°C. [Brief explanation of the drawings]

[0042] In the following figures, the invention is explained in more detail by design examples, without being limited thereto. [Figure 1] 1 is a cross-sectional view showing a design example of one embodiment of a heated hose of the present invention. [Figure 2] 2 is a perspective view of the heated hose of FIG. 1 at an intermediate stage in the manufacture of the heated hose. DETAILED DESCRIPTION OF THE INVENTION

[0043] 1 and 2 show a heated hose 1 for transporting a liquid, and is present for transporting an adhesive, whereby FIG. 2 shows the heated hose 1 at an intermediate stage during the production of the heated hose 1, and therefore FIG. 2 shows the heated hose 1 in an unfinished state.

[0044] The heated hose 1 includes a flexible hose 2 for carrying a liquid. The flexible hose 2 is surrounded by a heating device 3, whereby the heating device 3 in this case includes two heating wires spirally wound around the flexible hose 2, with one end of one heating wire connected to the other. This design of the heating device 3, with the heating wires connected to each other at their ends, allows for connecting the power source of the heating device 3 to only one end of the heated hose 1. It is considered particularly advantageous if each heating wire is surrounded by an electrical insulator. The electrical insulator may be, for example, a PTFE or silicone coating, or a PTFE or silicone sheath. However, PTFE is preferred.

[0045] The heated hose 1 also has an insulating layer surrounding the flexible hose 2 and the heating device 3, the insulating layer being formed by a strip of insulating material 4 that is spirally wound around the flexible hose 2 and the heating device 3 and self-overlaps, the overlap being approximately 50% of the width B of the insulating material strip 4. The insulating material strip 4 includes aerogel.

[0046] The heated hose 1 further comprises a dust-proof cover layer 5 or at least one cover layer 5 that reduces dust emission, whereby the cover layer 5 directly surrounds the heat-insulating layer. The heated hose 1 further comprises a plurality of control lines 6 and a plurality of electrical supply lines 7, which are spirally wound around the cover layer 5.

[0047] The heated hose 1 has an outer sheath 8 which surrounds the control lines 6 and electrical supply lines 7 and seals the internal components of the heated hose 1 from the environment.

[0048] At the end, the heated hose 1 has a connection structure 9 for forming a fluid connection between the heated hose 1 and further components of the application device and / or the conveying device and / or the melting device. In order to prevent the ingress of dust and / or liquid into the interior of the heated hose 1 in the region of the connection structure 9, the end of the heated hose 1, and thus in the region of the connection structure 9, has an end cap 10 which surrounds the connection structure 9 and which also surrounds the end part region of the outer cover 8.

[0049] It is quite conceivable that the heated hose 1 further comprises a temperature sensor, whereby the temperature sensor is preferably arranged between the insulating layer and the flexible hose 2 .

[0050] As shown in particular in FIG. 1, all components of the heated hose 1 that are spirally wound around the flexible hose 2 have the same winding direction. [Explanation of symbols]

[0051] 1 … heated hose 2... Flexible hose 3... Heating device 4...Strip insulation 5... Cover layer 6... Control line 7... Electricity supply line 8...Outer cover 9...Connection structure 10...end cap

Claims

1. A flexible hose for conveying adhesive, an insulating layer surrounding the flexible hose; and a heating device surrounding the flexible hose and the heating device is disposed between the flexible hose and the insulating layer; the insulating layer includes a strip of insulating material, the strip of insulating material is spirally wound around the flexible hose, and the strip of insulating material includes aerogel; the thermal insulation layer is disposed radially outwardly and adjacent to the heating device; A heated hose for delivering adhesive, wherein the spirally wound insulation strip wraps are capable of being displaced relative to one another.

2. A flexible hose for conveying adhesive. an insulating layer surrounding the flexible hose; and a heating device surrounding the flexible hose and the heating device is disposed between the flexible hose and the insulating layer; the insulating layer includes a strip of insulating material, the strip of insulating material is spirally wound around the flexible hose, and the strip of insulating material includes aerogel; the heated hose includes a cover layer, the cover layer immediately surrounding the insulating layer; A heated hose for conveying adhesive, wherein the cover layer is dustproof.

3. 3. The heated hose of claim 1, wherein the insulating strip has a width of 15 mm to 60 mm and / or a thickness of 1 mm to 3 mm.

4. 4. The heated hose of claim 1, wherein the insulating strip is wrapped around the flexible hose so as to overlap itself, and the overlap relative to the width of the insulating strip is between 20% and 50%.

5. The heated hose according to any one of claims 1 to 4, wherein the aerogel is a silicate-based aerogel.

6. The heated hose of any one of claims 1 to 5, wherein the insulation has a support structure.

7. The heated hose of any one of claims 1 to 6, wherein the insulating strip has a coating.

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

9. The heated hose of any one of claims 1 to 8, wherein the insulating strip comprises a sheath.

10. The heated hose of any one of claims 1 and 3-9, wherein the heated hose includes a cover layer, the cover layer immediately surrounding the insulating layer.

11. 11. The heated hose of claim 10, wherein the cover layer comprises a strip of cover material, the strip of cover material being spirally wrapped around the insulating layer.

12. 12. The heated hose of any one of claims 1 to 11, wherein the heated hose comprises control lines and / or electrical supply lines, the control lines and / or electrical supply lines being connectable to components of a delivery device and / or application device that interact with the heated hose.

13. 13. The heated hose of claim 12, wherein the control and / or electrical supply lines are spirally wound around the insulating layer.

14. The heated hose of any one of claims 1 to 13, wherein the heated hose has an outer sheath, the outer sheath comprising silicone and / or polyurethane and / or polyethylene, or consisting of silicone, polyurethane or polyethylene.

15. 15. The heated hose according to claim 10, wherein the winding direction of the cover material and / or the winding direction of the control lines and / or the winding direction of the electrical supply lines and / or the winding direction of the heating device coincides with the winding direction of the insulating material.

16. 16. The heated hose according to claim 1, wherein the windings of the insulating strip have a pitch angle of 5° to 30°.

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