Hose, hose arrangement, and corresponding method for producing a hose arrangement

Abstract

The invention relates to a process for manufacturing a hose arrangement, wherein a hose nipple is inserted into a hose having an inner layer made of PE-RT, wherein, prior to and / or during the insertion of the hose nipple, an inner diameter of the hose is thermally expanded, in particular by means of a mandrel which has been heated to at least a Vicat softening temperature, to a temperature that is at least 30 K or 50 K above the Vicat softening temperature.

Description

TECHNICAL FIELD 5 The invention relates to a hose having an inner hose and a braid. BACKGROUND The discussion of the background to the invention 10 herein is intended to facilitate an understanding of the invention. However, it should be appreciated that the discussion is not an acknowledgement or admission that any aspect of the discussion was part of the common general knowledge as at the priority date of the 15 application. US 2007 / 0209728 A1 discloses a low-pressure hose for connection to diving cylinders. 20 DE 20 2012 100 489 U1 discloses a hose line for transporting liquid or gaseous media, having a hose layer of uncrosslinked polyethylene, wherein the hose layer has a degree of crosslinking of permanently less than 60% on account of a missing crosslinking step. 25 CN 205383359 U describes a flexible tube with an inner tube. The utility model DE 20 2019 103 378 U1 discloses a 30 flexible tube for heating systems that comprises a multiplicity of radial layers. EP 2 048 422 A1 discloses a braided hose with a metallic visual appearance. DE 43 20 281 A1 discloses a thermoplastic elastomer hose. 2021268096   06 Aug 2026 EP 1 956 149 describes a hose that is in particular in the form of a shower hose and is encapsulated by injection molding. 5 The invention also relates to a hose arrangement having a hose nipple and a hose, wherein the hose nipple is arranged in a plug-in region of the hose. 10 The American patent document US 5,124,878 describes a lightweight hose arrangement for transporting fuels and other corrosive liquids. DE 25 57 996 A1 describes a detachable attachment 15 connection for hydraulic and / or pneumatic lines. The invention lastly relates to a method for producing a hose arrangement, wherein a hose nipple is plugged into a hose. 20 CN 105402502 B discloses a method for producing a heat insulating heating / cooling pipe made from plastic. A method for producing a seal in an endpiece of a 25 flexible line with a pressure shell is described in FR 3 035 171 A1. Hoses, in particular connection hoses, having a braid are known. In this respect, the braid serves to avoid 30 rupture of a flexible inner hose, to ensure the required tensile strength and / or to protect the inner hose against damage. It may therefore be desirable to provide a hose having 35 improved manufacturing and / or use properties. SUMMARY OF THE INVENTION 2021268096   06 Aug 2026 According to one form of the present invention there is provided a hose, having an inner hose and a braid, wherein the inner hose consists of an uncrosslinked, thermoplastic material, wherein the braid has a 5 coverage between 75% and 98%, wherein the inner hose is manufactured from PE-RT having a melt flow index (190°C / 2.16 kg) of 0.5 to 2 g / 10 min and a density of 0.925 to 0.960 g / cm3, wherein an outer diameter D of the inner hose, given and measured in mm, and a wall 10 thickness s of the inner hose, given and measured in mm, satisfy the following: A < 10 000 * s / D1-5 and 10 000 * s / D1.5 < B, 15         wherein A >= 390 1 / mm0.5, and B <= 585 1 / mm0.5. In particular, according to the invention in the case of a hose of the type described in the introduction, it is therefore proposed that the inner hose consists of 20 an uncrosslinked, thermoplastic material, wherein the inner hose (2) is manufactured from PE-RT having a melt flow index (190°C / 2.16 kg) of 0.5 to 2 g / 10 min and a density of 0.925 to 0.960 g / cm3. It has been found that this material selection makes it possible to achieve 25 especially favorable use properties in terms of flexibility and buckling resistance. In this respect, it may be provided that the material PE-RT can be characterized as polyethylene (PE) having 30 raised temperature resistance (RT), for example as type I or type II in accordance with DIN EN ISO 22391 2:2010-04, section 4. The melt flow index may be defined, for example, in 35 accordance with ASTM D1238 or ISO 1133. 2021268096   06 Aug 2026 Particularly favorable use properties can be achieved when, in a preferred configuration, the inner hose is manufactured with a density of 0.929 to 0.940 g / cm3. 5 In particular, in the case of a hose of the type described in the introduction, according to an embodiment of the invention it is therefore proposed that an outer diameter D of the inner hose, given and measured in mm, and a wall thickness s of the inner 10 hose, given and measured in mm, satisfy the following: A < 10 000 * s / D1.5 and 10 000 * s / D1.5 < B, wherein A >= 390 1 / mm0.5, preferably A = 425 1 / mm0.5, and 15 B <= 585 1 / mm0.5, preferably B = 565 1 / mm0.5. This parameter selection is particularly advantageous for achieving good buckling resistance. In an advantageous configuration, it may be provided 20 that the outer diameter D of the inner hose (2) < 10 mm, preferably < 9 mm or < 7 mm. In conjunction with the braid, it is therefore possible to realize hoses that are particularly strong under tension and flexible in commercially available implementations. 25 In an advantageous configuration, it may be provided that the braid makes contact with the inner hose along its entire circumference and / or over a length of the braid. It is therefore possible to increase buckling 30 resistance, in particular for the abovementioned ranges of outer diameter D and wall thickness s. The invention has recognized that a narrow braid prevents a cross section of the inner hose from becoming excessively oval when it bends, which would promote buckling. In an advantageous configuration, it may be provided that the braid has a braid angle between 41° and 55°. 2021268096   06 Aug 2026 This results in a good balance between tensile strength and rupture pressure resistance. The braid angle may for example be characterized by an 5 angle between the monofilament and a longitudinal direction (for example hose axis) in an (imaginary) unwound braid. In general, the following variables refer to the 10 following: e inliner Core [mm] the outer diameter of th Dwire #Wires Pitch [mm] [mm] the diameter of a single filament per strand axial length of the number of filaments the length of lay or the 15 one complete winding of a filament around the inliner of the hose 20 #Bobbins the number of bobbins of machine for receiving a reel, on which a strand filaments was wound. the braiding respective braid of individual The braid angle (“BraidAngle”) is then calculated as follows: 7i * (Core + 2 * Dwire) 2 5                  BraidAngle = arctan--------p't h-------- As an alternative or in addition, it may be provided that the braid has a coverage between 75% and 99%. This results in a good balance between buckling resistance 30 and flexibility. The coverage may for example be characterized by the ratio of a surface area of a surface covered by monofilaments to an overall surface containing the 35 monofilaments and the interspaces between them in an (imaginary) unwound braid. 2021268096   06 Aug 2026 The coverage (“Coverage”), with the definitions above, is calculated as follows: Coverage = 2 * B factor — Bfactor2 with B factor = Dwi re*#Wires*#Bobbins 2*Pitch*sin(BraidAngle) 5 A braid angle between 43° and 49° and / or a coverage between 84% and 93% is / are particularly preferred. It has been found that, for this range of values, the use properties in terms of tensile strength and rupture pressure resistance and / or in terms of buckling 10 resistance and flexibility can be particularly good. In an advantageous configuration, it may be provided that the braid is made from a plastic monofilament having a diameter of 0.14 mm to 0.50 mm. This makes it 15 possible to obtain braids that ensure good flexibility combined with resistance to tensile stress (along a longitudinal axis) or to loading from internal pressure or rupture. 20 The diameter is preferably in the range of 0.20 mm to 0.3 mm. Particularly good use properties result at a diameter of 0.25 mm ± 0.025 mm. In particular, it may be provided that the plastic 25 monofilament is manufactured from polyamide or polyester. This provides inexpensive materials with good processing properties. In an advantageous configuration, it may be provided 30 that the braid is made with a stainless steel monofilament having a diameter of 0.14 mm to 0.50 mm. The invention thus also makes it possible to form a hose with a metallic braid. At the values given, good use properties can be achieved. 2021268096   06 Aug 2026 The diameter is preferably in the range of 0.16 mm to 0.2 mm. Particularly good use properties result at a diameter of 0.18 mm ± 0.01 mm. 5 According to a second form of the present invention, there is provided a hose arrangement, having a hose nipple and a hose with an inner hose according to the first form, wherein the hose nipple is arranged in a plug-in region of the hose, in particular of the inner 10 hose, wherein an outer diameter of the hose nipple in the plug-in region is at least as great as the sum of a clear inner diameter of the hose, in particular of the inner hose, measured outside the plug-in region, and a wall thickness of a wall delimiting the clear inner 15 diameter, in particular 1.0, 1.1, 1.2, 1.3, or 1.4 times the wall thickness of the wall. Given an increased wall thickness of the inner hose, a sufficiently great inner diameter of the hose nipple can therefore be obtained without adversely affecting 20 the stability of the hose nipple under mechanical loading — for example during the crimping operation. The outer diameter of the hose nipple in the plug-in region is preferably at least as great as the sum of 25 the clear inner diameter of the hose (for example an inner hose of the hose), measured outside the plug-in region, and 1.0, 1.1, 1.2, 1.3 or 1.4 times the wall thickness of the wall. In this instance, the result is a particularly favorable inner diameter of the hose 30 nipple combined with sufficient mechanical stability of the hose nipple. In an advantageous configuration, it may be provided that the hose has an inner hose and the wall has an 35 inner hose wall. It is therefore possible for the hose nipple, when it is plugged in, to define a widening of the inner hose that does not excessively delimit the 2021268096   06 Aug 2026 inner diameter of the hose nipple - for example in the form of a considerable obstacle to flow. The inner hose may be encompassed by a braid, for example in order to form a hose as has already been described. 5 According to a third form of the present invention, there is provided a hose arrangement, having a hose nipple and a hose, according to the first form, wherein the hose nipple is arranged in a plug-in region of the 10 hose, in particular of the inner hose, wherein an outer diameter of the hose nipple in the plug-in region is at least as great as the sum of a clear inner diameter of the hose, in particular of the inner hose, measured outside the plug-in region, and a wall thickness of a 15 wall delimiting the clear inner diameter, in particular 1.0, 1.1, 1.2, 1.3 or 1.4 times the wall thickness of the wall, wherein the hose nipple, at its plug-in end, has an end face which is oriented in the plug-in direction and is planar or convexly curved in an axial 20 portion, wherein the end face has an outer diameter which is the same or greater than a clear inner diameter of the hose outside of the plug-in region. . In particular, in the case of a hose arrangement of 25 the type described above, it is therefore proposed in an embodiment of the invention that an outer diameter of the hose nipple in the plug-in region is at least as great as the sum of a clear inner diameter of the hose (for example an inner hose of the hose), measured 30 outside of the plug-in region, and a wall thickness of a wall delimiting the clear inner diameter. Given an increased wall thickness of the inner hose, it is therefore possible to obtain a sufficiently great inner diameter of the hose nipple, without adversely 35 affecting the stability of the hose nipple under mechanical loading - for example during the crimping operation. 2021268096   06 Aug 2026 The outer diameter of the hose nipple in the plug-in region is preferably at least as great as the sum of the clear inner diameter of the hose (for example an 5 inner hose of the hose), measured outside of the plugin region, and 1.0, 1.1, 1.2, 1.3 or 1.4 times the wall thickness of the wall. In this instance, the result is a particularly favorable inner diameter of the hose nipple combined with sufficient mechanical stability of 10 the hose nipple. It is particularly favorable here when, in this respect, the hose is configured according to the invention, in particular as described above and / or as 15 claimed in one of the claims directed to the hose. The advantages of the material selection of the inner hose can therefore also be utilized in this case. In the case of a hose arrangement, it is also provided 20 according to the invention that the hose nipple, at its plug-in end, has an end face oriented in the plug-in direction, wherein the end face has an outer diameter d2, which is the same or greater than a clear inner diameter di of the hose outside of the plug-in region. 25 In this respect, an outer diameter may be considered to be the same as an inner diameter, for example, when the tolerance ranges from the manufacture at least partially or even completely overlap. If the inner diameter is the same size as the outer diameter, there 30 is no otherwise usual joining gap of approximately 4 / 10 mm, for example, with the result that although the end face can just be inserted into the hose, this cannot be done in a mechanical method. 35 It is particularly favorable here if an extension is formed at a free end of the hose nipple, which 2021268096   06 Aug 2026 extension maintains the outer diameter beyond an axial region. An insertion aid can thus be formed. Experience has shown that only from a joining gap of 5 more than 4 / 10 mm between the inner hose and the hose nipple is it possible to perform a plugging in operation in industrial mass production in a manner which is reliable in terms of the process. The use of a joining gap has the result that an inner diameter of 10 the hose nipple is smaller than technically necessary, as a result of which the flow resistance of the hose nipple is needlessly high. As an alternative or in addition, the use of a joining gap has the result that an outside diameter of the (inner) hose is greater than 15 technically necessary, as a result of which the buckling stability is needlessly low. It has been shown that the matching of di and d2, which allows a joining gap of less than 4 / 10 mm with the (overlapping) tolerance ranges or which forms an excess length, 20 results in advantageous properties. In this respect, the end face may define a planar surface or have a (convexly) curved contour in an axial portion. The curved contour may be useful during the 25 plug-in operation, while the planar surface establishes a defined termination. In this respect, the end face may be defined, for example, as an axial projection of an outer surface of 30 the hose nipple as far as the first holding rib in a radial plane with respect to a plug-in direction of the hose nipple. In this respect, for example, the radial plane may be characterized as the plane which is perpendicular to a longitudinal direction (for example 35 a hose axis). 2021268096   06 Aug 2026 In the case of a hose arrangement of the type described in the introduction, it is therefore proposed in an embodiment that the hose, at its plug-in end, is widened by a thermal treatment, in particular using a mandrel heated to at least a Vicat softening temperature. The Vicat softening temperature may be defined for example as VST / A / 50 in accordance with DIN EN ISO 306. The heating is preferably performed to a temperature at least 30 K or 50 K above the Vicat softening temperature. This makes it possible to have the effect that the material of the inner hose is also brought close to or above the Vicat softening temperature on the mandrel. It is therefore easy to create plastic deformation during the plugging-in or pressing-in operation. In particular, it may be provided that the hose is designed according to the invention, in particular as described above and / or as claimed in one of the claims directed to a hose. This makes it possible to also utilize the advantages of the material selection or of the braid in this instance. According to a fourth form of the invention, there is provided a method for producing a hose arrangement according to the third form, wherein a hose nipple is plugged into a hose having an inner hose according to the first form, wherein, before and / or during the plugging in of the hose nipple, an inner diameter of the hose is widened by a thermal treatment, in particular using a mandrel heated to at least a Vicat softening temperature, preferably to a temperature at least 30 K or 50 K above the Vicat softening temperature. For example VST / A / 50. A method for 2021268096   06 Aug 2026 producing a hose arrangement is thus described. The heating of the hose can result in the elimination of crack formation in the inner hose. 5 In an advantageous configuration, it may be provided that the mandrel is pushed into a push-in region of the hose, wherein the hose is held on the outside in the push-in region. 10 As an alternative, it may be provided that the hose is held partially or completely outside the push-in region. This makes it possible to be able to achieve a particularly favorable widening for plugging in the hose nipple. 15 In an advantageous configuration, it may be provided that a crimping sleeve is plugged on before the widening operation. This makes it possible to be able to avoid undesired splaying of the braid during 20 assembly. A preferred use of the hose and the hose arrangement is the sanitary hose, for example in the form of a connection hose. 25 According to a fifth form of the present invention, there is provided a series of hose arrangements, comprising at least two variants, each of which is a hose arrangement according to the second or third 30 formand / or is produced by a method according to the fourth form, in particular wherein the inner hoses of the variants have differing outer diameters D and / or outer diameters D of less than 10 mm, less than 9 mm or less than 7 mm. In particular, this makes it possible 35 to have the effect that all variants are in the range defined by the formulae and therefore achieve a good compromise between buckling resistance and flexibility, 2021268096   06 Aug 2026 in particular wherein the buckling resistance is improved by the braid. In this respect it may be provided that the inner hoses 5 of the variants have differing outer diameters D. It is thus possible to be able to design series which have variants with different throughflow classes and / or different space requirements. 10  As an alternative or in addition, it may be provided that the inner hoses of the variants have outer diameters D of less than 10 mm, less than 9 mm or less than 7 mm. It is thus possible to be able to design series which have variants that can be used 15  particularly well in the kitchen sector and / or in the shower sector. The invention will now be described in more detail with reference to exemplary embodiments, but is not limited 20 to these exemplary embodiments. Further exemplary embodiments will become apparent by a combination of the features of one or more claims and / or with one or more features of the exemplary embodiments. 25 BRIEF DESCRIPTION OF THE DRAWINGS In the drawings: figure 1  shows an axial section of a hose according to the invention in the case of a hose 30             arrangement according to the invention, figure 2  shows a method according to the invention for producing a hose arrangement, 35 figure 3 shows a further method according to the invention for producing a hose arrangement, 2021268096   06 Aug 2026 wherein the hose is held below a push-in region for a mandrel, figure 4 shows a third method according to the 5             invention for producing a hose arrangement, wherein a crimping sleeve is placed on before the widening operation, and figure 5 shows a partially axially cut-open 10             illustration of a detail of part of a hose arrangement according to the invention (on the right-hand side) and of the associated hose nipple on its own (on the left-hand side). 15 DETAILED DESCRIPTION Figure 1, in a greatly schematic form for the purpose of explaining the concept of the invention, shows a hose, denoted overall by 1, which is provided with an 20 inner hose 2 of an uncrosslinked, thermoplastic material and a braid 3 attached to the outside of the inner hose 2. In the exemplary embodiment, the inner hose 2 consists 25 of PE-RT and has a melt flow index (190°C / 2.16 kg) of 0.5 to 2 g / 10 min and a density of 0.929 to 0.940 g / cm3. In other exemplary embodiments, the values are chosen differently, in particular a melt flow index (190°C / 2.16 kg) in the range of 0.1 to 10 g / 10 min 30   and / or a density in the range of 0.925 to 0.960 g / cm3. In the exemplary embodiment, the inner hose 2 has an outer diameter D and a wall thickness s. 35  The following applies for D and s in mm: A < 10 000 * s / D1-5 and 10 000 * s / D1-5 < B, 2021268096   06 Aug 2026 wherein A = 425 1 / mm0.5, and B = 565 1 / mm0.5. In other exemplary embodiments, the values are chosen differently, for example in the range of A >= 390 1 / mm0.5, preferably A = 425 1 / mm0.5, and / or B <= 585 5 1 / mm0.5, preferably B = 565 1 / mm0.5. It is thus possible to design series of hose arrangements comprising at least two variants, each of which is designed as described above and satisfies the 10 abovementioned relationships. In this respect, it may be provided that in a first variant the outer diameter D is less than 10 mm, in a second variant less than 9 mm, and / or in a third 15 variant less than 7 mm. First variant, second variant and / or third variant may also be dispensed with, with the result that only two of the three variants remain. In the exemplary embodiment shown, the braid 3 has a 20 braid angle between 43° and 49° and a coverage between 84% and 93%. In other exemplary embodiments, the values are chosen differently, for example a braid angle between 41° and 55° and / or a coverage between 75% and 99%. 25 In a first variant, the braid 3 is made with a monofilament 4 (cf. figure 2) of plastic, for example of polyamide or polyester. The diameter of the monofilament 4 is 0.25 mm ± 0.025 mm. In other 30 exemplary embodiments, the monofilament has a different diameter, for example in the range of 0.14 mm to 0.50 mm, in particular of 0.20 mm to 0.3 mm. In a second variant, the braid 3 is made with a 35 stainless steel monofilament having a diameter of 0.18 mm ± 0.01 mm. In other exemplary embodiments, the monofilament has a different diameter, for example in 2021268096   06 Aug 2026 the range of 0.14 mm to 0.50 mm, in particular of 0.16 mm to 0.2 mm. To form a hose arrangement 5 according to the 5 invention, in the exemplary embodiment shown a hose nipple 6 is plugged into the hose 1, in this instance for example the inner hose 2, and arranged in a plug-in region 7. 10 An outer diameter da of the hose nipple 6 in the plugin region 7 is at least as great as the sum of a clear inner diameter di of the hose 1 (here the inner hose 2), measured outside of the plug-in region 7, and a wall thickness s of a wall 8 delimiting the clear inner 15 diameter di, here the wall of the inner hose 2 in the form of an inner hose wall. The hose nipple 6 thus projects on each side over half of the wall thickness s, that is to say over the center line 19 of the material of the wall 8, into the undeformed inner hose 20   2 (that is to say outside of the plug-in region 7). The hose nipple 6 at its plug-in end 9 has an end face 11 oriented in the plug-in direction 10. In this respect, the end face 11 may be defined for example as 25 an axial projection of an outer surface 17 of the hose nipple 6 as far as a first holding rib 18 in a radial plane with respect to a plug-in direction of the hose nipple, or as the planar, axially facing surface. If the hose nipple (in a further exemplary embodiment) has 30 a conical outer shape, it is therefore possible for the end face to include the first portion of the rise on the cone as far as the first holding rib, or the end face 11 only includes the axial surface at the free end 21. The end face 11 has an outer diameter d2 which is larger than a clear inner diameter di of the hose 2021268096   06 Aug 2026 outside of the plug-in region 7. This has the result that it is very difficult to impossible to press the hose nipple 6 into the untreated inner hose 2. 5 In a further exemplary embodiment according to figure 5, the outer diameter d2 of the end face 11 is exactly the same as the clear inner diameter di of the (inner) hose 2 outside of the plug-in region, that is to say the undeformed hose. If the overlapping tolerance 10 ranges of the hose nipple 6 and of the inner hose 2 are taken into account, the inner diameter di will sometimes be slightly larger or slightly smaller than the outer diameter d2. This shows that it is necessary to widen the inner hose 2 before plugging in the hose 15 nipple, even when d2 < di. While in figure 1 da and d2 differ only by a height of the holding ribs 18, in this instance da is significantly greater than d2, since the hose nipple 6 20 tapers at its free end 21 to form a (sleeve-shaped) extension 22. In all other respects, components and functional units that have a similar or identical function and / or design 25 in relation to figures 1 to 4 are denoted by the same reference signs and are not described again separately. The embodiments relating to figure 1 to figure 4 therefore apply correspondingly. 30 Figure 2 shows a production method according to the invention. A mandrel 12 is heated (on the left-hand side) to a temperature at least 50 K above the Vicat softening 35 temperature of the material of the inner hose 2. 2021268096   06 Aug 2026 The hose 1 is widened at its plug-in end 9 by a thermal treatment using the mandrel 12 (in the center). In the process, the hose 1 is held on the outside by 5 holding jaws 13. In this respect, the holding jaws 13 are placed such that they enclose and support the hose 1 in a push-in region 14. 10 Then, the holding jaws 13 are removed again, and the mandrel 12 is pulled out (on the right-hand side). A plastically shaped widening 15 remains, into which 15 the hose nipple 6 can be readily pressed. The braid 3 is not widened. Figure 3 shows a further method according to the invention. Components and functional units that have a 20 similar or identical design or function in relation to the preceding exemplary embodiment are denoted by the same reference signs and are not described separately. The embodiments relating to figures 1 and 2 therefore apply correspondingly here. 25 The exemplary embodiment according to figure 3 differs from that according to figure 2 in that the holding jaws 13 are arranged below the push-in region 14. 30  This has the result that the braid 3 is also widened under the influence of the mandrel 12. The inner hose 2 is thus beveled to a lesser extent in the bevel 20 than in the situation according to figure 2. 35  Figure 4 shows a further method according to the invention. Components and functional units that have a similar or identical design or function in relation to 2021268096   06 Aug 2026 the preceding exemplary embodiment are denoted by the same reference signs and are not described separately. The embodiments relating to figures 1 to 3 therefore apply correspondingly here. 5 The exemplary embodiment according to figure 4 differs from that according to figure 3 in that a crimping sleeve 16 is plugged on before the widening operation. The braid 3 is therefore fixed in the plug-in end 9. 10 After the mandrel 12 has been pulled out (figure 4, on the right-hand side), the hose nipple 6 is plugged into the widening 15 and the crimping sleeve 16 is crimped. 15 In the case of a hose 1, it is therefore proposed according to the invention to produce an inner hose 2 from an uncrosslinked, thermoplastic material and to widen the inner hose 2 by a thermal treatment. 20 Unless the context requires otherwise, where the terms “comprise”, “comprises”, “comprised” or “comprising” are used in this specification (including the claims) they are to be interpreted as specifying the presence of the stated features, integers, steps or components, 25 but not precluding the presence of one or more other features, integers, steps or components, or groups thereof. 2021268096   06 Aug 2026 WO 2021 / 224325             20          PCT / EP2021 / 061845 List of reference signs 1 Hose 2 Inner hose 3 Braid 4 (Plastic / stainless steel) monofilament 5 Hose arrangement 6 Hose nipple 7 Plug-in region 8 Wall 9 Plug-in end 10 Plug-in direction 11 End face 12 Mandrel 13 Holding jaws 14 Push-in region 15 Widening 16 Crimping sleeve 17 Outer surface 18 Holding rib 19 Center line 20 Bevel 21 Free end 22 Extension D Outer diameter D of 2 s Wall thickness of 2 da Outer diameter of 6 di Inner diameter of 2 d2 Outer diameter of 11

Claims

1. A hose, having an inner hose and a braid, whereinthe inner hose consists of an uncrosslinked,5       thermoplastic material, wherein the braid has acoverage between 75% and 98%, wherein the inner hose is manufactured from PE-RT having a melt flowindex (190°C / 2.16 kg) of 0.5 to 2 g / 10 min and adensity of 0.925 to 0.960 g / cm3, wherein an outer10        diameter D of the inner hose, given and measuredin mm, and a wall thickness s of the inner hose,given and measured in mm, satisfy the following:A < 10 000 * s / D1.5and15                           10 000 * s / D1.5 < B,wherein A >= 390 1 / mm0.5, and B <= 585 1 / mm0.5.

2. The hose as claimed in claim 1, wherein A = 4251 / mm0.5.

203. The hose as claimed in claim 1 or 2, wherein B = 565 1 / mm0.5.4.The hose as claimed in claim 1,wherein the inner25        hose is manufactured with a density of 0.929 to0.940 g / cm3.

5. The hose as claimed in any one of the preceding claims, wherein the outer diameter D of the inner30        hose < 10 mm, preferably < 9 mm or < 7 mm, and / orin that the braid makes contact with the innerhose along its entire circumference and / or over alength of the braid.35   6. The hose as claimed in any one of the precedingclaims, wherein the braid has a braid anglebetween 41° and 55°, in particular between 43° and 49°, and / or the coverage is between 84% and 93%.2021268096   06 Aug 20267. The hose as claimed in any one of the preceding claims, wherein the braid is made with a plastic monofilament, in particular of polyamide or5        polyester, having a diameter of 0.14 mm to 0.50mm, in particular of 0.20 mm to 0.3 mm,particularly preferably 0.25 mm ± 0.025 mm.

8. The hose as claimed in any one of the preceding10        claims, wherein the braid is made with a stainlesssteel monofilament having a diameter of 0.14 mm to0.50 mm, in particular of 0.16 mm to 0.2 mm,particularly preferably 0.18 mm ± 0.01 mm.15   9. A hose arrangement, having a hose nipple and ahose having an inner hose as claimed in any one ofclaims 1 to 4, wherein the hose nipple is arrangedin a plug-in region of the hose, in particular ofthe inner hose, wherein an outer diameter of the20        hose nipple in the plug-in region is at least asgreat as the sum of a clear inner diameter of thehose, in particular of the inner hose, measuredoutside of the plug-in region, and a wallthickness of a wall delimiting the clear inner25        diameter, in particular 1.0, 1.1, 1.2, 1.3, or 1.4times the wall thickness of the wall.

10. The hose arrangement as claimed in claim 9, wherein the wall is an inner hose wall.3011. A hose arrangement, having a hose nipple and a hose, as claimed in any one of claims 1 to 5,wherein the hose nipple is arranged in a plug-inregion of the hose, in particular of the inner35        hose, wherein an outer diameter of the hose nipplein the plug-in region is at least as great as thesum of a clear inner diameter of the hose, inparticular of the inner hose, measured outside the2021268096   06 Aug 2026plug-in region, and a wall thickness of a walldelimiting the clear inner diameter, in particular1.0, 1.1, 1.2, 1.3 or 1.4 times the wall thicknessof the wall, wherein the hose nipple, at its plug-5        in end, has an end face which is oriented in theplug-in direction and is planar or convexly curved in an axial portion, wherein the end face has anouter diameter which is the same or greater than aclear inner diameter of the hose outside of the10        plug-in region.

12. The hose arrangement as claimed in any one ofclaims 9 to 11, having a hose nipple and a hose as claimed in any one of claims 1 to 8, wherein the15        hose nipple is arranged in a plug-in region of thehose, wherein the hose, at its plug-in end, iswidened by a thermal treatment, in particular using a mandrel heated to at least a Vicatsoftening temperature, preferably to a temperature20        at least 30 K or 50 K above the Vicat softeningtemperature.

13. A method for producing a hose arrangement asclaimed in any one of claims 9 to 12, wherein a25        hose nipple is plugged into a hose having an innerhose as claimed in any one of claims 1 to 8,wherein, before and / or during the plugging in ofthe hose nipple, an inner diameter of the hose is widened by a thermal treatment, in particular30        using a mandrel heated to at least a Vicatsoftening temperature, preferably to a temperature at least 30 K or 50 K above the Vicat softening temperature.35   14. The method as claimed in claim 13, wherein themandrel is pushed into a push-in region of thehose, wherein the hose is held on the outside in2021268096   06 Aug 2026the push-in region or partially or completelyoutside the push-in region.

15. The method as claimed in claim 13 or 14, wherein a5       crimping sleeve is plugged on before the wideningoperation.

16. A series of hose arrangements, comprising at least two variants, each of which is a hose arrangement10        as claimed in any one of claims 9 to 12 and / or isproduced by a method as claimed in any one of claims13 to 15, in particular wherein the inner hoses of the variants have differing outer diameters D and / or outer diameters D of less than 10 mm, less than 915        mm or less than 7 mm.

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