DE102004058089A1 - Process for the preparation of a primer on aluminum sheets or strips - Google Patents

Abstract

In a method for producing a primer on aluminum webs (2) or bands are to a z. B. for applying paints o. The like. Or for further processing of the aluminum sheets (2) or the aluminum strip to heat exchangers advantageous primer or modification of the aluminum sheet (2) or the aluminum strip to create two outer surfaces of the aluminum sheets (2) or and at least one (3) of two abutting outer surfaces of the aluminum sheets (2) or bands, before it comes into contact with the other outer surface, with hot, distilled water or steam at a temperature between 80 ° C to 120 ° C, preferably about 100 ° C, applied.

Description

"Method of production a primer on aluminum sheets or strips "

The This invention relates to a method of making a primer on aluminum tracks or bands.

such Aluminum tracks or bands serve often as starting materials for a variety of purposes. For example, such aluminum sheets or bands in further manufacturing or machining processes with coatings, e.g. Color coatings or paint coatings, provided. Furthermore can Such aluminum tracks and bands also as starting material for the production of heat exchangers, in particular rotary heat exchangers and warm wheels, as well Plate heat exchangers, Counterflow heat exchangers ud.dgl. be used.

Of the Invention is based on the object described at the outset Further develop a method such that with the simplest measures and without big ones technical-constructive or technical-economical effort a suitable priming or modification of the surfaces of Aluminum tracks or bands can be achieved.

These Task is inventively characterized solved, that two Outside surfaces of the Aluminum tracks or bands be brought into contact with each other and that at least one of two in Anlage ruling outer surfaces of the Aluminum tracks or bands, before it comes into contact with the other outer surface, with hot, distilled water or Steam at a temperature between 80 degrees C to 120 degrees C, beneficial about 100 degrees C, is applied. The distilled water or high temperature distilled vapor Moisture remains between the outer surfaces of the aluminum sheets or the aluminum bands. As a result, a transition occurs between these aluminum layers or layers Reaction to that, surprisingly a primer or structuring of the surface of the aluminum web or of the aluminum strip, which is in a great way suitable, as a primer for to serve any coatings or the further processing Such aluminum tracks or bands to heat exchangers considerably easier. This is especially true for the production of such heat exchangers, the above a high capacity to store moisture.

According to one advantageous development can the aluminum tracks or bands to be wound up into a coil, in which case the moisture between the wound layers of aluminum webs or aluminum bands remains.

The Humidification of an aluminum web to be wound up into a coil an aluminum strip to be wound into a coil becomes simple accomplished by the to the winding of the coil in conditioning outer surface of the aluminum sheet or of the aluminum strip prior to winding on the coil and / or the with this outer surface in plant outer surface of the or the already wound aluminum web or aluminum strip with the hot, distilled water or steam is applied.

The above-described reaction between the abutting Outer surfaces or between the individual layers or layers of the coil wound up Aluminum web or coil wound aluminum bands takes place in sufficient extent, if the plant is between the outer layers for one predetermined period, e.g. For 24 hours, is maintained or if that from the wound with water or steam applied aluminum web or -band Coil for this predetermined period remains in the wound state.

To this predetermined period, depending on the requirements of the occurring reaction and type, width, etc. of the aluminum web or of the aluminum strip, the outer surfaces of the aluminum sheets or bands away from each other and here or after or immediately after Removal of the outer surfaces from each other dried.

If the aluminum web or the aluminum tape wound into a coil was, this is settled after the predetermined period, the Aluminum web or the aluminum strip advantageous when unwinding is dried.

As already mentioned above, can the described method, in particular for the production of a heat exchanger made of aluminum bands or railways are used. After drying the aluminum sheet or the aluminum strip are made of such aluminum sheets or tapes Rotary heat exchanger, Heat wheels or the like. made, for example, wound. Alternatively you can out such aluminum bands the aluminum plates for plate heat exchangers, e.g. Counterflow heat exchanger or the like., Are produced.

Provided the dried aluminum sheets or strips after drying again can be wound on a coil they in this state in a simple manner to any production facilities or the like. be transported.

Around the capacity such aluminum webs or bands for the absorption of moisture Increase, it is beneficial when applied to the dried aluminum sheets or ribbons, preferably after heating the same to preferably about 70 Grade C, nanostructures rolled up or brought.

A further increase the absorption capacity for moisture is achieved when the from the primed or modified aluminum sheets or tapes manufactured heat exchangers in a lithium chloride solution, preferably in a 1 to 9 (vol) percent, in particular, a 2- (vol) percent immersed in lithium chloride solution becomes. Alcohol can advantageously be used as the base fluid of the lithium chloride solution become.

One inventive, from Aluminum tracks or bands manufactured heat exchanger has one by reaction with hot ßem, distilled water or steam primed or modified surface of his Aluminum webs or bands on.

On the primed or modified surfaces of the aluminum sheets or bands of the heat exchanger can additionally Nanostructures rolled up or be brought.

in the The following is the invention with reference to an embodiment with reference closer to the drawing explains in the sole figure, a schematic representation of an embodiment the method according to the invention is shown.

A method described below for producing a primer on coils 1 coilable aluminum bands 2 is described below in connection with the use of such a method for the production of a rotary heat exchanger or a heat wheel. The modified according to the process aluminum web 2 However, it can also serve as a starting material for the plates and similar components of a plate heat exchanger, for example a countercurrent heat exchanger or the like.

The aluminum track shown in the single figure 2 becomes the coil 1 rolled up or wound up.

During winding, in the representation selected in the single figure of the method according to the invention, the underside of the aluminum web 2 Just before this bottom with the already to the coil 1 wound aluminum web 2 in contact device, charged with hot, distilled water or water vapor. The temperature of the water or water vapor in this case is between 80 degrees C and 120 degrees C, but advantageously about 100 degrees C.

The on the bottom 3 the aluminum railway 2 applied, in the single figure by the arrow 4 shown amount of water or steam is between the bottom 3 the aluminum railway 2 and already on the coil 1 located top of the same introduced. There, this moisture remains.

The so under the application of water or steam to the coil 1 wound aluminum web 2 remains in the wound state, and for a predetermined period of time, which may be for example about 24 hours. During this period takes place between the abutting layers of the aluminum web 2 a reaction that results in a highly desirable priming or modification of the outer surfaces of the aluminum web 2 leads.

After the specified period of, for example, 24 hours, the aluminum web 2 from the coil 1 unwound, where it is subjected to a drying process.

After this drying process, the aluminum sheet has 2 a surface structure which is excellently suited to function as a primer, eg, for paints or the like.

Furthermore, the aluminum track 2 after the treatment described above particularly suitable for further processing to a heat exchanger, not shown in the figures, which may be, for example, a rotary heat exchanger or a heat wheel.

The aluminum railway 2 is wound for further processing to a rotary heat exchanger or a heat wheel to a corresponding matrix body.

Before the winding or curl of the aluminum tracks 2 takes place to a rotary heat exchanger, the aluminum web can be rewound in the dried state again to form a coil, which can then be easily transported to the production facility for corresponding rotary heat exchanger.

The appropriately pretreated aluminum sheet 2 In the illustrated embodiment of the method for producing a rotary heat exchanger is heated again, and preferably to about 70 degrees C. In this heated state are on the aluminum web 2 Nanostructures rolled up or applied. As a result, the capacity for moisture absorption of the aluminum web 2 be further increased.

Alternatively to the application of nanostructures to the aluminum web 2 or in addition to this measure may be the aluminum web 2 heat exchanger bodies are immersed in a lithium chloride solution. This measure also serves to increase the capacity for storing moisture of the heat exchanger body.

When Lithium chloride is a 2 (vol) percent lithium chloride solution to Use, wherein as the base fluid of the lithium chloride solution alcohol is used.

Claims (14)

Method for producing a primer on aluminum sheets ( 2 ) or bands, characterized in that two outer surfaces of the aluminum sheets ( 2 ) or bands are brought into contact with each other and that at least one ( 3 ) of two abutting outer surfaces of the aluminum sheets ( 2 ) or bands, before it comes into contact with the other outer surface, with hot, distilled water or steam at a temperature between 80 degrees C to 120 degrees C, preferably about 100 degrees C, is applied. Method according to Claim 1, in which the aluminum sheets ( 2 ) or bands to a coil ( 1 ) are wound up. Method according to Claim 2, in which the windings of the coil ( 1 ) in outer surface ( 3 ) of the aluminum web ( 2 ) or the aluminum strip prior to winding on the coil ( 1 ) and / or with this outer surface ( 3 ) outer surface of the already wound aluminum web ( 2 ) or aluminum bands with the hot, distilled water or steam is applied. Method according to one of claims 1 to 3, wherein the system between the abutting outer surfaces of the aluminum sheets ( 2 ) or bands for a predetermined period of time, for example for 24 h, is maintained. Method according to claim 4, wherein the aluminum web (from which the water or steam is applied) 2 ) or coil wound coil ( 1 ) remains in the wound state for the predeterminable period. Method according to one of claims 1 to 5, wherein the outer surfaces of the aluminum sheets ( 2 ) or bands are dried at or after, preferably immediately after the removal of the outer surfaces of each other. Method according to Claim 6, in which the coil ( 1 ) after the predetermined period and the aluminum web ( 2 ) or the aluminum strip is dried during unwinding. Method for producing a heat exchanger made of aluminum sheets ( 2 ) in which the method according to any one of claims 1 to 7 is carried out and after drying the aluminum web ( 2 ) or the aluminum strip such aluminum sheets ( 2 ) or bands to rotary heat exchangers, heat wheels or the like. be processed or wound or from such aluminum sheets ( 2 ) or bands the aluminum plates are made for a plate heat exchanger. Method according to Claim 8, in which the aluminum sheets ( 2 ) or bands after drying are rewound on a coil. A method according to claim 8 or 9, wherein the dried aluminum sheets ( 2 ) or ribbons, preferably rolled up after heating thereof to preferably about 70 degrees C, nanostructures. A method according to any one of claims 8 to 10, wherein the of the primed aluminum sheets ( 2 ) or bands produced in a lithium chloride solution, preferably a 1 to 9 (vol) percent, in particular 2 (vol) percent lithium chloride solution is immersed. The method of claim 11, wherein as the base fluid the lithium chloride solution Alcohol is used. Heat exchanger made of aluminum sheets ( 2 ), which have a surface primed or modified by reaction with hot, distilled water or steam. heat exchangers according to claim 13, wherein the primed or modified Surfaces additionally nanostructures rolled up or brought.