JPH1180856A - Production of deposited aluminum strip by recycling aluminum can - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to produce a deposited aluminum strip having good surface finishing by a simple method without the need for worry about metal loss at all. SOLUTION: After aluminum cans 1 are cut, the cut aluminum pieces 1a thereof are heated in a pure gaseous nitrogen atmosphere or an incomplete combustion gaseous atmosphere of gaseous propane, etc., to get rid of the deposits 4, such as coating materials, sticking to the surfaces. The cut aluminum pieces are thereafter engaged and laminated with and on each other and the laminate is continuously heated, pressed and deposited in a gaseous nitrogen atmosphere of a low dew point and is right thereafter rolled by rolling means, by which the deposited aluminum strip 30 is produced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a welded aluminum strip by recycling an aluminum can, and more particularly, to an aluminum can capable of manufacturing an aluminum strip having a good surface finish by a simple method. The present invention relates to a method for manufacturing a welded aluminum strip.

[0002]

2. Description of the Related Art From the viewpoint that the earth's resources are limited along with the global environment, there has recently been a shouting of a resource recycling campaign to reduce garbage as much as possible and to recycle aluminum cans previously produced as garbage. I have.

[0003] By the way, it is conventionally known that aluminum strips are cut into small pieces, melted, and then rolled to produce strips.

[0004]

However, when the aluminum can is melted, if the aluminum can is directly put into a melting furnace, a paint fume is generated and cannot be melted. Therefore, the paint is overheated and burned in advance. At that time, the aluminum is also significantly oxidized, and a large amount of metal loss of the oxide is generated, which lowers the yield and complicates the melting operation.

On the other hand, as another problem, a problem of material deterioration has been raised. That is, there is a problem in that chromium oxide, titanium oxide, iron oxide, and the like contained in the paint for aluminum cans are mixed into aluminum, which significantly deteriorates the material. However, it is very difficult to remove such a trace amount of impurities, and it has not yet been sufficiently solved.

The present invention solves the above-mentioned problems, and in particular, a new method of recycling aluminum cans, that is, welding that reuses aluminum cans by which an aluminum strip can be manufactured by welding without melting the aluminum can. An object of the present invention is to propose a method for manufacturing an aluminum strip.

[0007]

Means for Solving the Problems As a means for solving the above-mentioned problems, a method for manufacturing a welded aluminum strip using an aluminum can according to the present invention is as follows. Heating in a pure nitrogen gas atmosphere or in an incomplete combustion gas atmosphere such as propane gas to remove deposits such as paint adhered to the surface, and then engaging and laminating the aluminum cut pieces with each other to reduce the dew point. It is characterized by continuously heating, pressing and welding in a nitrogen gas atmosphere, and immediately thereafter rolling by rolling means to produce a welded aluminum strip.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a process chart of a method of manufacturing a welded aluminum strip by recycling an aluminum can according to the present invention, and the method of manufacturing a welded aluminum strip will be described in detail with reference to this process chart.

First, a large number of aluminum cans 1 to be reused are cut by a cutting machine 2 so as to have a thickness of less than 3 mm and a length of less than about 2,5 mm to form an aluminum cut piece 1a. The cut aluminum piece 1a is heated in a weakly oxidizing atmosphere furnace 3 at a temperature of about 300 to 450 [deg.] C. to remove deposits 4 such as seals and paints on the surface.

The weakly oxidizing atmosphere furnace 3 is filled with pure nitrogen gas and oxygen, and the oxygen is occupied by pure nitrogen gas at 0 to 1 to 5%.

The pure nitrogen gas in the weakly oxidizing atmosphere furnace 3 is not limited to this, but may be filled with an incomplete combustion gas such as propane gas.

Next, the aluminum cutting piece 1a from which the deposits 4 removed from the weakly oxidizing atmosphere furnace 3 have been
And cut it further to about 2 to 10 mm,
The surface of the finely cut aluminum piece 1a thus cut is cleaned and polished by a polishing machine 6 this time.

The polishing machine 6 is formed by a driving unit 6a driven by a motor (not shown) as a driving source and a stirring tank 6b. In the stirring tank 6b, an aluminum cut piece finely cut together with an abrasive 7 is provided. 1a is stored and is stirred by rotation.
After removing the deposits 4 such as paint in the weakly oxidizing atmosphere furnace 3, the residue adhering to the surface of the aluminum cut piece 1 a is removed to clean the surface.

Then, a mixture of the cut aluminum piece 1a whose surface has been cleaned and the abrasive 7 is mesh belt 9
Is placed on the mesh belt 9 of the conveyor 10 provided with the above, and is conveyed to a heating press / welding device. In this transport process, only the abrasive 7 is sifted down from the mesh belt 9.

On the other hand, the cut aluminum pieces 1a are engaged with each other and stacked to form a strip, and placed on the upper surface of the strip-shaped aluminum foil 11 disposed in a state of being penetrated in the heating press and sintering device 12. By the way, both ends of the strip-shaped aluminum foil 11 project from both sides of the heating press and welding device 12 and are wound.

Next, a heating press / welding device 12 includes a supply device 15 for supplying the aluminum cut piece 1a, a heating device 16 for heating the aluminum cut piece 1a, and a rolling device for rolling the welded aluminum cut piece 1a. 17.

The supply device 15 is used to heat the strip-shaped aluminum foil 11 and the strip-shaped cut piece 1a placed on the upper portion thereof.
6 so that it can be supplied while being rolled by a pair of upper and lower metal belt conveyors 20.

The heating device 16 is a device for welding the laminated aluminum strip 1a which is engaged with the belt-shaped aluminum foil 11 supplied from the supply device 15 to form a lamination.
The housing 21 is air-tightly covered, and a seal member (not shown) is interposed at each of the transfer port and the carry-out port of the aluminum cut piece 1a.

As shown in FIG. 2, inside the housing 21, a pair of heating elements 25 each having a ceramic plate 24 having an electric heating heater 23 on the back face are arranged to face each other. 23 is covered with a heat-resistant insulating plate 29. Reference numeral 26 denotes a ceramic soaking plate, which uniformly transfers heat to the ceramic plate 24.

The pressure for sandwiching the laminated aluminum cut pieces 1a between the heating elements 25 may be a pressure at which the cross-sectional compression ratio of the laminated aluminum cut pieces 1a becomes 70% or more in view of the welding strength.

In the housing 21, since the aluminum cut pieces 1a in a laminated state are heated to a high temperature, they are very easily oxidized.
The above nitrogen gas is filled. Also, 550-65
A temperature of about 0 ° C is preferred.

By the way, when the laminated aluminum strips 1a are heated, the aluminum slices 1a are combined with the other aluminum slices 1a and fired, and the whole is integrally joined. The whole is smooth and porous by the pressure applied from the substrate. Then, in this state, the aluminum strip 30 is manufactured by being carried out of the superheater 16 and immediately thereafter rolled by the rolling device 17 including a pair of walkers 27.

The strip-shaped aluminum foil 11 may not be provided, and the aluminum strip 30 may be manufactured by directly baking and laminating the strip-shaped aluminum cut piece 1a.

According to the method of manufacturing a welded aluminum strip using an aluminum can as described above, the welded aluminum strip 30 is manufactured by cutting, crimping, welding, and rolling steps without melting the aluminum can 1 to be recycled. Therefore, the manufacturing cost can be reduced.

When the aluminum cut piece 1a is heated, all the heating is performed in a nitrogen gas atmosphere. Therefore, the aluminum cut piece 1a does not come into contact with the air at a high temperature, and is usually about 15% when metal loss due to oxidation (combustion) is dissolved. In addition, in the case of the present application, since it does not dissolve, it does not occur at all, and the surface finish can be improved.

Further, by removing the deposits 4 such as paint on the surface of the cut aluminum piece 1a in the weakly oxidizing atmosphere furnace 3, it is possible to manufacture a high-purity welded aluminum strip 30.

[0028]

As described above, according to the method for manufacturing a welded aluminum strip using an aluminum can according to the present invention, the steps of cutting, crimping, welding and rolling are performed without melting the aluminum can. As a result, the manufacturing cost can be reduced.

Also, the cut piece after cutting the aluminum can is
Heating in a pure nitrogen gas atmosphere or an incomplete combustion gas atmosphere such as propane gas removes paint and other deposits on the surface, preventing oxidation and enabling production of high-purity welded aluminum strips. Can be

Further, the cut pieces are engaged with each other and laminated, and continuously heated and pressed in a nitrogen gas atmosphere having a low dew point.
Since the welded aluminum strip is produced by welding and immediately thereafter rolled by a rolling means, it does not come into contact with the air in a high temperature state, oxidation is prevented, and the surface finish can be improved.

The aluminum plate manufactured by the above method is porous because it is welded. Therefore, taking advantage of this characteristic,
For example, new uses can be expected as new materials that are lighter than aluminum, such as sound insulation boards for buildings and roads, heat insulating materials for buildings, and aluminum.

[Brief description of the drawings]

FIG. 1 is a process diagram showing a method for manufacturing a welded aluminum strip using an aluminum can according to the present invention.

FIG. 2 is a detailed explanatory view of a heating / pressing / welding apparatus in the above process drawing.

[Explanation of symbols]

 1 Aluminum can 1a Aluminum cut piece 4 Deposit

Claims (1)

[Claims] 1. After cutting an aluminum can, the cut aluminum piece is heated in a pure nitrogen gas atmosphere or in an incomplete combustion gas atmosphere such as propane gas to remove deposits such as paint adhered to the surface. Then, the aluminum cut pieces are engaged and laminated with each other, and continuously heated, pressed and welded in a nitrogen gas atmosphere having a low dew point, and immediately thereafter rolled by a rolling means to produce a welded aluminum strip. A method of manufacturing a welded aluminum strip by recycling an aluminum can.