JPH0617206A - Device for degreasing aluminum strip and its manufacture - Google Patents

Abstract

PURPOSE:To burn away residual rolling oil on the surface of Al foil, Al thin plate, etc., without reducing its rigidity by heating the surface with a burner or the like while carrying the Al foil or Al thin plate by winding them to a bridge roll. CONSTITUTION:The foil or thin sheet 8 of Al or an Al alloy taken up to a roll shape 1 is fed to the bridge roll 4 having a large diameter through a dancer roll 2. While being carried by the rotation of the roll 4, the rolling oil remaining on the surface of the Al foil 8 is burned with the burner 3 just above the roll 4 and is perfectly removed away. Since the system of the inside of the bridge roll 4 is formed of a water cooled one, the Al foil 8 is annealed by the burning and degreasing operation for the rolling oil, and, as the Al foil 8 whose surface is uniformly degreased and free from the reduction in rigidity, the Al foil is taken up by the take-up machine 9 through wrinkle preventing roll 5, a bridge roll and a tension roll 7.

Description

Detailed Description of the Invention

[0001]

The present invention relates to an aluminum strip after rolling (in the present invention, an aluminum strip has a thickness of 5 μm to 3 m).
m of aluminum or aluminum alloy foil or plate. ) In the degreasing process, the aluminum strip has high water wettability in the width direction and the lengthwise direction, high uniformity of surface characteristics such as oxide film, and high productivity. The manufacturing method of the article.

[0002]

2. Description of the Related Art Aluminum is useful because it has excellent workability and is a metal, and it is supplied in large quantities at a low cost as aluminum foil or a plate, and is used as a packaging material, electric material, industrial material, daily necessities. Widely used for decorations, etc.

The purpose of annealing the aluminum strip is not only to soften the aluminum strip itself, but also to remove the rolling oil used in the production of the aluminum strip. Usually, it is better to soften the aluminum strip. For the latter purpose of removing rolling oil, the temperature, time, etc. of the annealing are set in practice.

In the annealing treatment, the rolling oil is removed at the same time as the annealing of the aluminum strip, but if the removal of the rolling oil is insufficient, many secondary processes such as a plastic film are performed thereafter. Since it is likely to cause troubles in processes such as bonding with the like, printing, coloring, chemical treatment, etc., the annealing condition is selected so as to completely remove the rolling oil rather than the condition for softening the aluminum strip.

Regarding the removal of rolling oil during the aluminum strip annealing step, the type of rolling oil becomes a problem as a factor affecting the processing temperature and time, and the width, winding diameter, winding hardness, etc. of the product have a great influence. give. Especially for aluminum strips, the demand for wider and longer products has been increasing recently.
This is a direction to increase resistance to the loss of rolling oil from the coil, and heat treatment requires high temperature and long time to completely remove rolling oil, which is not necessarily desired. This is accompanied by softening of the aluminum strip.

Thus, in order to completely remove the rolling oil and to ensure the uniformity of the surface characteristics in the coil width direction and the length direction (oxide film thickness, water wettability) by annealing in the coil shape as it is. , Heating at a temperature of about 300 ° C for a long time (for example, 5
It is said that it is necessary to process for 0 to 100 hours (Aluminium Foil Productio).
n. 1975, Vol. 20, pp185-207)
However, it is still difficult to obtain a product that is uniform in the width direction.

Especially in the case of rolling oil in the central part of the coil in the central part of the coil width of wide and long products, the rolling oil is lost from the outer surface and the clearance is small (when the winding hardness is hard). Long distance, less heat supply,
It becomes difficult to ensure the uniformity of the surface characteristics in the width direction due to the increased loss resistance, and it is necessary to anneal at high temperature for a long time to ensure the uniformity, and it is necessary to further soften the aluminum strip. It will be promoted.

On the other hand, it is necessary to completely remove the rolling oil,
Rigidity is required for specific applications such as fields requiring high-stiffness aluminum strips, such as PTP foils for pharmaceuticals, mini cups, and applications such as cap sealing materials where printing pitch and misalignment are problems. High material (eg 30
03, Al-Fe alloy) is required, but if pure aluminum that has been coil-annealed for a long time is used, the softening progresses and the mechanical strength is significantly lowered, causing various problems.

Therefore, in the production of highly rigid aluminum strips, the oil adhered in the rolling step is naturally evaporated during the winding of the separator or slitter after the rolling, or the corona is formed immediately before the processing such as printing and bonding. Electric discharge treatment and anchor coat treatment have been applied to remove the effects of rolling oil residue. In this case, since the effect of the corona discharge treatment becomes weaker with the lapse of time after the treatment, there is a limitation that the treatment should be performed immediately before the next step. Further, the anchor coat treatment has a demerit that an apparatus and a process such as a solvent recovery device are complicated for application of an anchor coat agent, solvent evaporation process, and further for environmental protection.

Frame processing (also referred to as fire processing) in the lamination of paper, paperboard, plastic, etc .: "Recently Laminating Manual, p43, Publishing Technology Research Institute, published June 30, 1989" Although mentioned, degreasing of aluminum strip rolling oil is not mentioned.

[0011]

DISCLOSURE OF THE INVENTION According to the present invention, when degreasing an aluminum strip, the surface characteristics (water wettability, oxide film thickness, etc.) in the width direction and the length direction are good, and even if degreasing, the aluminum strip is degreased. It is an object of the present invention to develop a degreasing device having high rigidity, high speed and high productivity, and a method for producing an aluminum strip having desired properties using the degreasing device.

[0012]

The present invention provides (a) a high-speed rotating roll whose temperature can be adjusted (b) an aluminum strip wound around a part of the surface of the roll so as to assist a tension reel or the like that can run at high speed. Roll (c) A degreasing device for an aluminum strip, which comprises a burner provided so that the aluminum strip on the surface of the roll can be subjected to a frame treatment,
And a method for producing a hard aluminum strip characterized by treating the surface of a separated or slit aluminum strip that is wound around the surface of a rotating cooling roll with a high-temperature frame, and is further wound around the surface of a rotating heating roll. The above object has been achieved by developing a method for producing a semi-hard or soft aluminum strip characterized by treating the surface of a separated or slit aluminum strip with a high temperature frame.

The aluminum strip to which the present invention is applied is pure aluminum for general industry (including electrolytic aluminum and ordinary pure aluminum) and aluminum alloy, and there is no particular limitation. Although the thickness of the aluminum strip is not particularly limited, it is generally about 5 μm to 3 mm.

The frame treatment is a separator in the rolling process,
Where a single aluminum strip such as a slitter runs, or by a frame processing device installed in any line between the process from the separator, slitter, etc. to the aluminum strip winder, or the separator, slitter, etc. The coiled aluminum strip that has been wound up can be processed in a process in which an off-line frame processing device other than the line is installed. When considering ease of operation and productivity, it is easier to use the inline method at once.

As the frame processing device, for example, there is one shown in FIG. 1 (for single-sided processing) when the rolled aluminum strip is separated and the material wound on the roll is subjected to the frame processing.

The aluminum strip (1) wound into a roll is supplied to a bridle roll (4) provided with a burner (3) via a dancer roll (2). The bridle roll (4) is driven by a motor (not shown), and the aluminum strip is wound around more than about half of the circumference of the roll with the help of another tension reel or the like. The roll is cooled by circulating cooling water or the like.

The burner (3) is a bridle roll (4)
Slightly away from, the aluminum strips (8) on the roll surface are provided to blow the frame. Here, the aluminum strip whose surface has been heated and oil has been incinerated is cooled by the cooling roll in contact therewith, and is also cooled after leaving the frame, so that annealing of the aluminum strip is prevented. Next, the aluminum strip (8) from which oil has been removed is wound into a roll by a winder (9) after passing through auxiliary rolls such as a rubber roll (5) for preventing wrinkles, a bridle roll (6) and a tension reel (7). Taken.

In the above description, a single-sided processing device was shown, but if a bridle roll with adjustable temperature and another set of frame burners are provided so that the other surface of the aluminum strip can be framed, the double-sided frame processing will be performed. Can be done all at once.

Although the bridle roll (4) has been described as being cooled, it should be a device capable of producing a semi-hard or soft aluminum strip in one pass when it is used as a heating roll such as circulating heating oil or enclosing an electric heater. You can

In the above description, the aluminum strip which has been separated and wound up has been described.
It goes without saying that the frame processing part may be installed in the line between the separator or slitter and the winder for continuous processing.

The flame treatment of the present invention is performed by the calorific value of the burner, the thickness of the aluminum strip, the type of rolling oil and the residual oil amount,
Although it depends on the target contact angle of the product aluminum strip with pure water, whether it is in-line or offline, generally high-speed treatment of about 100 to 800 m / min is possible.

Prior to the frame treatment, the type of rolling oil adhering to the aluminum strip, the amount of rolling oil deposited, the aluminum material of the intended product aluminum strip, the mechanical strength,
Since the energy supplied per area varies depending on properties such as the thickness of the strip and the contact angle of the aluminum strip with water, it is preferable to measure it experimentally. A small amount of degreasing may be required when sufficient annealing is performed in another annealing step. Separately, when an aluminum strip with high mechanical strength is required, sufficient rolling oil removal is required only by flame treatment. Because.

Generally, the aluminum strip after the frame treatment has a contact angle with water of 70 ° or less, preferably 60 °.
If it is less than the following, it will be an aluminum strip that does not hinder normal use, so it is necessary to perform frame processing within this numerical range as a target.

The amount of heat supplied as a frame also varies depending on various conditions, but in general applications it is about 0.1-10.
kcal / m ² (one side), which is slightly higher than this value, especially when it is desired to increase the degreasing degree.

The temperature of the cooling roll also varies depending on the target product aluminum strip rigidity, burner capacity, aluminum strip thickness, running speed, etc., but is not limited to about 40 ° C. or less for rigid strips and about half for semi-rigid strips. It is about 180 to 300 ° C, and about 250 to 600 ° C for soft. If the obtained aluminum strip is harder than the target rigidity, the roll temperature may be raised, and if it is soft, the roll temperature may be lowered.

Of course, it is also possible to once manufacture an aluminum strip having a rigidity higher than the target rigidity, and perform annealing in combination with the conventional batch annealing (the aluminum strip is annealed while being rolled). At this time, degreasing in the flame treatment is not required to be complete, and the time required for batch annealing can be significantly shortened.

[0027]

[Function] When the frame treatment method used for surface treatment when laminating paper, plastic, etc. is applied to remove (incinerate) residual oil adhering to the surface of the rolled aluminum strip, the frame treatment is performed on a water-cooled roll. By doing so, the rolling oil on the surface of the aluminum strip was successfully removed while preventing the softening.

Although the mechanism has not been clarified, since aluminum is a good conductor of heat, it is strongly cooled to the surface of the aluminum strip that is in contact with the frame, the temperature hardly rises, and it is slightly in the surface layer. It is estimated that only the residual oil layer is incinerated.

It was also found that annealing can be performed at the same time as degreasing by replacing the water cooling roll with a heating roll.
The present invention will be specifically described below with reference to examples.

[0030]

EXAMPLE An aluminum foil rolled into a roll after separation of 1N30 and a thickness of 7 μm is shown in FIG.
Frame processing was performed using the device. The results are shown in Table 1. The oxide film thickness was measured by the Hunter Hall method.

[0031]

[Table 1]

From the above results, the method of the present invention can degrease the contact angle of water on the aluminum strip surface from 97 ° to about 60 ° even if the frame processing speed is extremely fast.
Further, even if the frame treatment is performed, the thickness of the oxide film does not change, and the tensile strength also matches the aluminum strip after rolling within an error range, and no reduction in strength is observed.

[0033]

INDUSTRIAL APPLICABILITY The degreasing apparatus of the present invention is an apparatus for removing rolling oil on the surface of an aluminum strip by the frame of a gas burner or a petroleum burner. Since the heat supply capacity can be made extremely large, the aluminum strip is Can be processed at high speed.

Further, according to the method of the present invention, the nonuniformity of the surface characteristics (water wettability, oxide film thickness, etc.) in the width direction and the length direction, which has been a problem in the conventional degreasing by batch annealing, is greatly improved. By using a chill roll, degreased hard aluminum strip with high rigidity could also be manufactured.

When a semi-hard or soft strip is required, it can be produced by using a heating roll instead of the cooling roll or by combining flame treatment and batch annealing. In this case, since degreasing is performed in advance, the time required for batch annealing can be greatly shortened, and the aluminum strip manufacturing method is high-speed and highly productive.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of an apparatus used for single-sided frame processing according to an embodiment.

[Explanation of symbols]

 1 Payoff 2 Dancer roll 3 Burner 4 Bridle roll 5 Wrinkle prevention roll 6 Bridle roll 7 Tension reel 8 Aluminum strip 9 Winder

Claims (3)

[Claims] 1. A high-speed rotating roll whose temperature can be adjusted. (B) An auxiliary roll such as a tension reel in which an aluminum strip is wound around a part of the roll surface so that it can run at high speed. (C) On the roll surface. A degreasing device for aluminum strips, which is composed of a burner provided so that the aluminum strips shown in can be processed by a frame. 2. A method for producing a hard aluminum strip, characterized in that the surface of a separated or slit aluminum strip that is wound around a surface of a rotating cooling roll and travels is treated with a high-temperature frame. 3. A method for producing a semi-hard or soft aluminum strip, characterized in that the surface of a separated or slit aluminum strip wound around an upper surface of a rotating heating roll and traveling is treated with a high-temperature frame.