WO2013013663A1

WO2013013663A1 - Device for reinforcing tanks with fibres impregnated with synthetic resin

Info

Publication number: WO2013013663A1
Application number: PCT/DE2012/000763
Authority: WO
Inventors: Abdul Amir SHUBBAR; Mahdi SHUBBAR
Original assignee: Shubbar Abdul Amir; Shubbar Mahdi
Priority date: 2011-07-27
Filing date: 2012-07-27
Publication date: 2013-01-31
Also published as: DE112012003132A5; DE102011111359A1

Abstract

A device for reinforcing tanks by a layer of fibres impregnated with synthetic resin, consisting of an impregnating vessel (2) which is filled with liquid synthetic resin (3) and in the vicinity of which a tank (1) is arranged which is fixed on a rotatable shaft (4) and a fibre guide (5), by means of which fibres (6) can be guided into the impregnating vessel from the outside and via which vessel they can be guided up to the surface of the tank and, by rotation of the tank, can be wound up on the surface thereof, wherein the synthetic resin can be cured by irradiation with ultraviolet radiation and/or light and/or infrared rays and/or electron beams, and the surface of the tank which is wound with the fibres impregnated with synthetic resin can be irradiated by at least one radiation source (7).

Description

Device for reinforcing tanks with synthetic resin impregnated fibers

The invention relates to a device for reinforcing tanks by a resin-impregnated fiber support, consisting of an impregnation tank, which is filled with liquid resin and in the vicinity of which a tank is arranged, which is attached to a rotatable shaft and a fiber guide, by means of which fibers from the outside into the drinking container and through it to the surface of the tank feasible and can be wound by rotation of the tank on the surface thereof.

In the current state of the art, glass fibers impregnated with synthetic resin are wound up on a hollow body made of plastic - the liner - for producing high-pressure-resistant tanks for storing and transporting liquids and gases. The liner remains in the final product. The resins are cured so that the fibers embedded therein stabilize the tank and increase its compressive strength.

According to this principle, US Pat. No. 3,366,522 describes how several fibers are unwound from bobbins and guided via deflection rollers to an impregnating container. In these impregnation containers, they are pressed in with a larger roller and immerse into the liquid synthetic resin, which is located in the impregnation tank. After passing through this impregnating container, the fibers, which are now impregnated with liquid synthetic resin, are guided via further deflection rollers onto the surface of the tank to be reinforced. This tank is suspended in US 3,366,522 between two axes, with which it can rotate about its longitudinal axis, wherein the longitudinal axis is oriented horizontally.

Bestätigungskopiel No. 3,366,522, the impregnating container and the mechanism arranged thereon and therein for guiding the fibers are arranged on a carriage which can be moved reversibly along its wall on rails parallel to the longitudinal axis of the tank.

While the tank is rotated about its longitudinal axis by means of the two shafts between which it is mounted, the trolley with the impregnator and the fiber guide reverses continuously. As a result, the fibers are spirally wound on the surface of the tank. Multiple layers of opposing spirals thus form multiple layers of fibers which intersect with each other due to the opposing formation of the spirals. At the very numerous crossing points, the fibers are connected to each other by the synthetic resin.

In a further processing step, the resin must be cured. This allows the reinforced container to withstand a much higher pressure than the plastic core - the liner - alone could.

However, this production process has several disadvantages. On the conveying paths of the impregnated fibers from the impregnation tank to winding up on the tank and during transport of the wound tank into the curing resin curing resin drips off, which deposits on parts of the machine and there gradually hardens because of the high ambient temperature. Because this would soon block the machine, the still liquid drops of artificial resin must be regularly removed with solvents. Already partially hardened resin residues must be softened with solvents. In the water container, the parts of the resin that are not entrained by the fibers gradually harden and then have to be removed and disposed of. For this work, the machine must be stopped at regular intervals, interrupting the production process.

Another disadvantage is the emissions of harmful gases that burden the operating personnel and the environment. The solvents used for cleaning evaporate and of the synthetic resin itself rise more gases. Therefore expensive exhaust and exhaust air filters have to be designed and operated.

Another major disadvantage of the previously known methods is that of the mostly used, liquid synthetic resins only relatively small amounts can be prepared, since the two components after mixing already after about half an hour to get hard.

On the other hand, since full curing of the plastic may take two to four hours even at an optimum temperature of the curing oven, it is a further disadvantage that production is quite slow with only one oven per winding unit despite the extra factory space for the oven. If several ovens are assigned to a winding unit, although the output of the production unit is increased accordingly, but by the additional cost of the base area and the construction and operation of the furnaces and the price of reinforced tanks in this production increases significantly.

Against this background, the invention has the object of a device for winding tanks with resin impregnated To develop fibers that requires a shorter processing time compared to the prior art, virtually no synthetic resin loses during the application, takes much less space and requires much less energy for application and curing.

As a solution, the invention teaches that the synthetic resin is curable only by irradiation with ultraviolet radiation and / or light and / or infrared rays and / or electron beams and the surface of the wound with resin-impregnated fibers tanks can be irradiated by at least one radiation source.

It is therefore the essential idea of the invention to use, instead of the thermosetting synthetic resin, another synthetic resin which is only curable by irradiation with ultraviolet radiation and / or light and / or infrared rays and / or electron beams. This material can be kept ready in larger quantities, since it does not harden even after years and even at higher temperatures but remains liquid.

The most important advantage here, however, is that the synthetic resin reaches its maximum strength within a few seconds after a correspondingly intensive irradiation, ie hardens orders of magnitude faster than the purely thermally curable material hitherto used.

It is also advantageous that no harmful gases rise from this material, which must be collected and disposed of at high cost. Another essential part of the inventive idea is to develop a device which also fully exploits the said advantages of the UV-curable synthetic resin.

In the context of the invention is basically free, from which directions and relation with respect to the tank, the Kunstharzgetränkten fibers are supplied. In a particularly preferred embodiment, the supply takes place with respect to the axis of rotation of the tank in the radial direction. In this case, the feed itself only in individual angular ranges, but, which is particularly advantageous over the entire circumference, d. H. be performed simultaneously at an angle of 360 °. Especially in the latter embodiment, it is possible to apply a high amount of fiber per unit of time, since rapid utilization is possible with the utilization of the entire circumference. To cover the entire surface of the tank, the tank moves reversibly up and down in the direction of the axis of rotation. When the fiber feed is made in a comparatively short range of the axis length of the tank, the reversing motion to cover the entire surface is indispensable.

For these embodiments, the invention therefore proposes to make the impregnation container ring-shaped. In the middle of the ring remains a cavity that contains no synthetic resin. Instead, the container is lowered into this cavity. Then, the fibers which have passed through the impregnation tank and are thereafter impregnated with synthetic resin can be scraped off over the inner edge of the impregnation tank and guided onto the surface of the tank and wound.

Despite the achievable high performance, the devices described above prove to be disadvantageous when workpieces large axis length to be processed. These devices would be bulky and so expensive in terms of the need for movement of the workpiece that they would not be acceptable from an economic point of view. Also, the spatial arrangement of the impregnation tank specifies the maximum possible radius of the workpiece. For workpieces of large axis length, a variant is recommended in which the fibers are optionally guided from different directions tangentially to the surface of the tank and to produce a relative movement, the fiber guide is reversed in the direction of the axis of rotation. With horizontal storage of the tank, workpieces of large axis length can be processed easily, wherein the tangential feeding of the fibers permits a material application only in relatively narrow areas, so that longer working times are generally expected compared to the all-round radial feed.

In principle, it is possible that individual fibers or fiber bundles are assigned to a specific own impregnating container, as a result of which a larger number of spatially separate impregnating containers are present. With regard to the renewal of the contents of the impregnation container, it proves to be an advantage if all the fibers are guided through one and the same impregnation container.

Such an impregnation tank is considerably larger and more voluminous than in the prior art, but thanks to the longer life of the curable by radiation resin is easily possible. The decisive advantage of the annular impregnation tank is that fibers impregnated with synthetic resin from different directions can be guided onto the surface of the tank, hardened quickly and then be covered with a further layer of fibers. In this so-called "online process", each layer is cured after it has been applied, or hardened using the "online-online process", in which several outer layers of synthetic-resin-impregnated fibers are wound in the area of the impregnation container and only then be hardened by a radiation source.

A further alternative is the "offline process" in which only one radiation source outside the impregnation container hardens all layers of the synthetic resin together.

When applying fibers, the invention proposes that the tank is not only rotated in the cavity, but at the same time it is also reversibly moved upwards and downwards. This results in a wavy or meandering guidance of the fibers on the surface of the tank.

These wavy layers can also be hardened "on-line", ie layer by layer or "semi-online", ie after several layers lying on top of each other or "offline", ie after completion of the winding.

In one embodiment of the "on-line" cure, at least one source of radiation is located above the point or points where the resin-impregnated fibers impact tangentially on the surface of the tank.Thanks to the regular lifting of the tank, the "fresh" soaked fibers come in the radiation cone of the radiation source and are cured there immediately. If the intensity of the rays is sufficient, you can already have reached a sufficient hardness when the tank is lowered again and at this point with the next layer of

Resin impregnated fibers is occupied. As a further refinement, instead of a single radiation source, a plurality of radiation sources are proposed which extend annularly around the tank. Alternatively, it may of course also be an annular radiation source with a corresponding inner diameter.

In another alternative embodiment, in which a meandering or wave-shaped guidance of the fibers can be dispensed with, the invention proposes an even simpler embodiment. Also in this embodiment, fibers from several different directions are fed simultaneously to the surface of the tank. Between each two groups of fibers, which are fed from a different direction, a radiation source is arranged. The intensity of the jets of this source is so high and the speed at which the tank rotates is so low that the area of the tank irradiated therefrom is already sufficiently hardened when the next layer of resin-impregnated fibers is laid up. In a further embodiment, the invention proposes a method for increasing the amount of plastic with which the fibers are impregnated when they are placed on the tank surface. For this purpose, the fibers within the drinking container meandering - ie z. B. wavy - are performed. As a result, the running distance of the fibers within the liquid synthetic resin is extended and thus also the time within which the liquid plastic can penetrate into the pores and cavities of the fibers.

A derärt plentiful impregnation ensures that every new layer, which is placed on the plastic hollow body - the liner - contains virtually no air bubbles and therefore the light even better read. Although the material of the liner is transparent or translucent, it creates a high-pressure tank whose level can be checked from the outside by simply taking a look.

In the following, further details and features of the invention will be explained in more detail with reference to an example. However, this is not intended to limit the invention, but only to explain. It shows in a schematic representation:

Figure 1 oblique view of the principle of an inventive

contraption

FIG. 1 shows an oblique view of a device according to the invention for reinforcing tanks (1) by placing synthetic resin impregnated fibers. The impregnation container (2) with polygonal

Floor plan is a pleasant ring. In its interior, by a further, polygonal wall, a cavity (21) is divided, which is annularly surrounded by the liquid synthetic resin (3). In Figure 1, the liquid synthetic resin (3) is represented by numerous small, horizontal lines.

Coaxial with the tank container (2), the tank (1) is arranged. It is connected via the shaft (41) to the drive (42), which can set the tank (1) on the shaft (41) in rotation, which is shown in Figure 1 by a correspondingly curved arrow.

On one side of the tank (1), a radiation source (7) is shown as a block. Dotted lines indicate that the radiation source (7) emits ultraviolet radiation which strikes the surface of the tank (1). In Figure 1 is symbolized by a small vertical double arrow that the tank (1), the shaft (41) and the drive (42) can be lowered.

FIG. 1 shows how the tank (1) is wound with fibers (6) impregnated with synthetic resin (3). At the outer edges of the impregnation tank (2), two frames with coils (61) are shown as exemplary examples. represented on the respective fibers (6) have been wound. These fibers (6) are guided over the edge of the racks and the upper edge of the impregnation container (2) by means of two fiber guides (5) into the liquid synthetic resin (3) and out again. From these fiber guides (5), they extend to the upper edge of the inner wall of the impregnation container (2) and over the edge thereof on the surface of the tank (1).

In FIG. 1, it is easy to see that, as the tank (1) rotates about its longitudinal axis, the fibers (6) wrap around the tank (1). When the tank (1) is moved upwards and downwards in the vertical direction as well, the fibers (6) run in wavy lines around the tank (1).

In Figure 1 is not shown that the tank 1 can be lowered so far that it is completely immersed in the cavity (21) in the center of the watering tank (2). In this way, the fibers (6) can also be guided on the upper and on the lower end face of the tank (1) in each case to the center thereof.

There they can be wrapped around a - also not shown - flange around and glued to it. contingent tuell protruding ends of the fibers can then be cut off.

In the lower part of Figure 1, a further radiation source (7) can be seen below the drinking container (2). The tank (1) reaches it by being lowered down through the cavity (21). With such a second radiation source (7), in the so-called "off-line process", the tank (1) wound completely with synthetic resin-soaked fibers (6) can be finally through-hardened.

LIST OF REFERENCE NUMBERS

1 tank to be wound with Kunstharzdränkten fibers 6

2 impregnation containers filled with liquid synthetic resin 3

3 synthetic resin, tears the fibers 6

41 shaft for turning the tank 1 ^Λ

42 Drive from shaft 41

5 fiber guide for fibers 6

6 fibers to wrap the tank 1 around

61 coil with fibers 6

7 radiation source for curing the synthetic resin 3

Claims

claims

1 . Device for reinforcing tanks 1 by a resin-impregnated fiber support consisting of

an impregnating container 2,

- Is filled with liquid resin 3 and

- In the vicinity of a tank 1 is arranged, which is fixed to a rotatable shaft 4 and

- A fiber guide 5, by means of which fibers. 6

- From the outside into the impregnation tank 2 and through it to the surface of the tank 1 feasible and

- can be wound on its surface by rotation of the tank 1,

characterized in that

- The resin 3 is curable by irradiation with ultraviolet radiation and / or light and / or infrared rays and / or electron beams, and

- The surface of the wound with resin impregnated fibers 6 tanks 1 is irradiated by at least one radiation source 7.

2. Apparatus according to claim 1, characterized in that the fibers 6 are guided in relation to the axis of rotation of the tank 1 in the radial direction on the surface of the tank 1.

3. Apparatus according to claim 2, characterized in that the

Feeding over the entire circumference of the tank 1 is carried out simultaneously.

4. Apparatus according to claim 2 or 3, characterized in that the tank 1 is rotatable and reversible at the same time in the axial direction up and down movable.

Device according to one of claims 1 - 4, characterized in that

- the impregnation tank

- is annular and

- In the middle of a cavity 21, in which the tank 1 is lowered and

- The resin-impregnated fibers 6 on the inner edge of the watering tank 2 directly to the surface of the tank 1 are feasible.

Device according to one of the preceding claims, characterized in that a plurality of fibers 6 impinge tangentially on the Oberflä surface of the tank 1 and the fiber guide 5 is reversibly displaceable relative to the tank 1 in the axial direction.

Device according to one of claims 1 - 6, characterized in that all the fibers 6 are guided through the same impregnating container 2.

Device according to one of the preceding claims, characterized in that at least one radiation source 7 is arranged above the point or points in which resin-impregnated fibers 6 impinge tangentially on the surface of the tank 1

9. Apparatus according to claim 8, characterized in that a plurality of radiation sources 7 are arranged annularly around the tank 1 in a plane.

10. Device according to one of the preceding claims, characterized in that the wound with resin impregnated fibers 6 Tankl is exclusively or additionally far from the impregnating container 2 by a radiation source 7 can be irradiated.

1 1. Apparatus according to claim 6, characterized in that

between at least two groups of fibers 6, each tangential to the surface of the tank 1, at least one radiation source 7 is arranged.

12. Device according to one of the preceding claims, characterized in that the fibers 6 are guided in a meandering manner within the drinking container 2.