WO2013170930A1

WO2013170930A1 - Hose line, in particular for diving equipment

Info

Publication number: WO2013170930A1
Application number: PCT/EP2013/001289
Authority: WO
Inventors: Jörg Müller; Erdal Yücel
Original assignee: Rehau Ag + Co
Priority date: 2012-05-16
Filing date: 2013-05-02
Publication date: 2013-11-21
Also published as: DE202012101814U1; EP2850352A1

Abstract

The invention relates to a hose line, in particular for diving equipment, having at least one base layer (1), and at least one open reinforcement layer (2). According to the invention, the base layer (1) is constructed of at least two sublayers (3, 3') that are seamlessly coextruded with one another, and the reinforcement layer (2) is extruded so as to be between said sublayers (3, 3').

Description

Hose line, especially for diving equipment

The invention relates to a hose, in particular for diving equipment, with

- At least one base layer and

- At least one open reinforcement layer.

A reinforced hose for diving equipment is for example from the

US 2007/0209728 A1. The tube described therein has an inner layer of polyethylene or polyurethane, on which a closed reinforcing layer of polyester threads is applied. This reinforcing layer is in turn surrounded by another full-surface layer of nylon threads, which protect the

Armierungssschicht serves. Both the outer protective layer and the reinforcing layer are braided. The problem with this divers hose is that damage to the outer braid of polyamide threads exposed the threads of the reinforcing layer and thus can be easily damaged. This can lead to premature failure of the hose. In addition, the hose described is relatively stiff and also sensitive to dynamic loads, such as bends.

A hose with the features described above is known for example from US 2,143,852. The open reinforcement layer here forms a separate layer between inner tube and sheath. At a pressure load, the threads of the reinforcing layer can move uncontrollably, so that there is a permanent shift of the reinforcing threads and thus a weakening of the Armierungslage. Also, this hose tends to early failure under a dynamic load. Likewise, with this hose, there is again the risk that direct local contact of the reinforcing threads with the external environment will occur in the event of locally complete abrasion of the covering layer, which may result in premature failure. Against the background described, the invention has for its object to provide a hose with the features described above, which durable dynamic alternating stresses withstands, the Armierungslage is well protected against mechanical damage and also has a high flexibility.

According to the invention, the object is achieved in that the base layer is composed of at least two seamlessly co-extruded sub-layers and the reinforcing layer is extruded between these two sub-layers. The invention is based on the finding that the object described can be achieved in a simple and inexpensive manner by a departure from the classical layer structure "inner layer - reinforcing layer - outer layer." According to the invention, the reinforcing layer is integrated into the base layer, which is constructed from two plastic sublayers during the

Coextrusion be seamlessly welded together. Conveniently, the two partial layers consist of the same material or of the combination of materials polyurethane / nitrile rubber. Between these two partial layers, the reinforcing layer is extruded and is thus effectively protected against mechanical damage from the outside. The seamless connection between the two partial layers takes place in the free spaces of the open reinforcement layer and ensures an excellent fixation of the reinforcement layer within the base layer. Due to the open structure of the reinforcing layer a very good flexibility of the hose according to the invention is ensured. The two partial layers consisting of the same material are intimately connected by the coextrusion process, so that a compact monolayer base layer is created, in which the two partial layers seamlessly merge. This results in a thick-walled base layer with an integrated reinforcement layer. Due to the crystallized thread channels, the reinforcing threads can not emigrate under dynamic pressure loads, so that the reinforcing layer retains its predefined shape. The hose line can thus withstand alternating bends controlled. Overall, the individual reinforcing threads remain in their original position for a long time even with a strong cyclic load, so that the best possible reinforcing effect is ensured. The hose according to the invention is also distinguished by the fact that it is ecologically harmless, since no adhesive is required for its production. According to a preferred embodiment of the invention, the reinforcing layer is composed of a plurality of threads, which only intersect overlappingly and thereby form free spaces in which the partial layers merge seamlessly with one another. It is therefore deliberately dispensed with elaborate braiding or tissue production. Conveniently, the reinforcing layer is composed of at least two partial layers, wherein a partial position consists of mutually parallel threads. Preferably, the threads of both overlapping partial layers are aligned obliquely to the tube axis and in this case form diagonal lines which preferably enclose an angle of 44 to 64 °, in particular 50 to 58 °, with the tube longitudinal axis. The counter-rotating, overlapping and open reinforcement layer according to the invention is enclosed in the base layer and yet flexible. Conveniently, the reinforcing layer consists of polyester.

According to a further preferred embodiment of the invention, the base layer is encased by an outer layer, preferably made of polyamide. This is expediently constructed of braided threads. The outer layer protects the base layer against abrasion. It is essential that the outer layer or the threads of the outer layer are not in direct contact with the Armierungslage and thus even with a complete abrasion of the outer layer, the Armierungslage is protected by the outer sub-layer of the base layer.

The base layer may consist of polyurethane, polyethylene or the combination of materials polyurethane / nitrile rubber, e.g. in that the inner part layer is made of polyurethane and the outer part layer is made of nitrile rubber or vice versa. Conveniently, the reinforcing layer is in the outer half, e.g. arranged in the outer third of the base layer. In the context of the invention it is also the case that the outer sub-layer and / or the inner sub-layer of the base layer is transparent. Transparent means transparent or translucent. The transparency facilitates the control of the manufacturing process of the base layer with the single extrusion of the reinforcement layer between the two partial layers. In the context of the invention, it is further that the outer sub-layer is colored by means of color pigments. This allows a great variety of colors in a simple way, provided that the outer layer has an open structure, is transparent or absent.

The hose according to the invention is particularly suitable for use in diving equipment in which high mechanical loads in both static and dy- Namibia are to cope. For example, the hose can be connected to a compressed air cylinder and serve to supply the diver with air.

In the following the invention will be explained in detail with reference to a drawing showing only one embodiment. They show schematically:

1 shows a cross section through a hose line according to the invention and

Fig. 2 is a side view of the hose shown in Fig. 1.

Fig. 1 shows a hose line, which is used in particular for diving equipment. It has a base layer 1 and an open reinforcement layer 2. From Fig. 1 it can be seen that the base layer 1 of two seamlessly with each other

coextruded partial layers 3, 3 'is constructed and the reinforcing layer 2 is extruded between these two sub-layers 3, 3'. The seamless transition between the inner sub-layer 3 and the outer sub-layer 3 'is indicated by a thin dashed line r. In the exemplary embodiment, the two partial layers 3, 3 'consist of the combination of materials polyurethane (inner partial layer 3) and nitrile rubber (outer partial layer 3').

It can be seen from FIG. 2 that the reinforcing layer 2 is made up of a plurality of reinforcing threads 4, 4 ', which intersect only overlappingly and thereby form free spaces 5, in which the partial layers 3, 3' merge seamlessly into one another. FIG. 2 also shows that the reinforcing layer 2 is made up of two partial layers 6, 6 ', with one partial layer 6 or 6' each consisting of parallel arranged, mutually spaced reinforcing threads 4 or 4 '. The reinforcing threads 4, 4 'of both overlapping partial layers 6, 6' are aligned obliquely to the tube longitudinal axis x and in this case form diagonal lines 7, 7 '. These include with the tube longitudinal axis x an angle α of 44 to 64 °, for example 50 to 58 °, a. The reinforcing threads 4, 4 'arranged spirally around the tube axis x are made of polyester.

A comparative consideration of FIGS. 1 and 2 can also be seen that the base layer 1 is surrounded by an existing of polyamide outer layer 8. This is constructed from braided threads, not shown. In particular, Fig. 1 shows that the reinforcing layer 8 is disposed in the outer half of the base layer 1, wherein the boundary between inner and outer half by the mean diameter d _m = (d _a + d,) / 2 of the base layer 1 is defined. Furthermore, it is indicated in FIG. 2 that the base layer 1 in the exemplary embodiment is completely transparent, ie both inner sub-layer 3 and outer sub-layer 3 '. The inner diameter d, the tubing formed from the inside of the base layer 1 is 4 to 8, for example, 5 to 7 mm. The layer thickness s = (d _a - dj) / 2 of the base layer 1 is 2 to 5 mm, for example 3 to 4 mm. The axial distance I between two reinforcing threads 4, 4 'belonging to the same sub-layer 6, 6' is 0.5 to 3 mm, for example 1 to 2 mm. The area size of the individual free spaces 5 formed by the reinforcing threads 4, 4 'in which the two partial layers 3, 3' merge seamlessly into each other is at least 0.5 mm ² , preferably at least 1 mm ² , on the other hand the area size <5 mm ² is.

Claims

claims

1. Hose line, especially for diving equipment, with

- At least one base layer (1) and

- At least one open reinforcement layer (2), characterized in that the base layer (1) of at least two seamlessly coextruded partial layers (3, 3 ') is constructed and the Armierungslage (2) between these two partial layers (3, 3') extruded is.

2. Hose line according to claim 1, characterized in that the partial layers consist of the same material or of the combination of materials polyurethane / nitrile rubber.

3. Hose line according to claim 1 or 2, characterized in that the reinforcing layer (2) of a plurality Armierungsfäden (4, 4 ') is constructed, which intersect only overlapping and thereby form free spaces (5), in which the two sub-layers (3, 3 ') seamlessly merge.

4. Hose line according to claim 3, characterized in that the Armierungslage (2) from at least two partial layers (6, 6 ') is constructed, wherein a partial layer (6, 6') respectively from mutually parallel Armierungsfäden (4, 4 ') consists.

5. Hose line according to claim 4, characterized in that the reinforcing threads (4, 4 ') of both overlapping partial layers (6, 6') obliquely to the hose longitudinal axis (x) are aligned and in this case diagonal lines (7, 7 ') form , which with the

Hose longitudinal axis (x) preferably an angle (a) of 44 to 64 °, in particular 50 to 58 ° include.

6. Hose line according to one of claims 1 to 5, characterized in that the reinforcing layer (2) consists of polyester.

7. Hose line according to one of claims 1 to 6, characterized in that the base layer (1) of a, preferably made of polyamide, outer layer (8) is sheathed.

8. Hose line according to claim 7, characterized in that the outer layer (8) consists of braided threads.

9. Hose line according to one of claims 1 to 8, characterized in that the base layer (1) consists of polyurethane, polyethylene or the material combination polyurethane / nitrile rubber.

10. Hose line according to one of claims 1 to 9, characterized in that the reinforcing layer (2) in the outer half, preferably in the outer third, the base layer (1) is arranged.

11. Hose line according to one of claims 1 to 10, characterized in that the outer sub-layer (3 ') and / or the inner sub-layer (3) of the base layer (1) is formed transparent.