JP3247438B2 - Aluminum foil separator with degreasing function - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method of separating aluminum foil after rolling (in the present invention, aluminum foil means aluminum or aluminum alloy foil) from aluminum foil rolled in two layers. A single aluminum foil, and a device for cutting and winding to a predetermined width and length, and a single foil for cutting and winding to a predetermined width and length, The present invention relates to an aluminum foil separator capable of simultaneously removing rolling oil adhering to an aluminum foil surface.

[0002]

2. Description of the Related Art Aluminum or aluminum alloys are relatively inexpensive, have good workability and mechanical suitability for their price, and are excellent in inexpensive conductive materials, chemical corrosion resistance, decorativeness, etc. It is widely used as industrial material, electrical material, packaging material, etc.

In particular, in the fields of packaging materials, electrical materials, daily necessities, decorative articles, industrial materials, etc., a large amount of aluminum foil (about 5 μm to 200 μm) for use therein is produced.

[0004] These aluminum foils are generally rolled by rolling a slab-shaped aluminum lump using a roll, and particularly in the case of a thin foil, two rolls are rolled. Adhered, and as it is, often hinders secondary processing of aluminum foil such as printing and lamination.

[0005] For this reason, it is customary to anneal the aluminum foil cut into a specified size and also to degreasing (removal of rolling oil) into one sheet through a separator. This annealing is often performed while the aluminum foil is wound in a coil shape.

[0006] In the case of aluminum foil, softening of the material by degreasing and annealing proceeds simultaneously, and the annealing time becomes longer due to degreasing.

[0007] That is, the removal of the rolling oil adhering to the surface of the aluminum foil is usually performed by so-called batch annealing in which heat treatment is performed for a long time while the separated aluminum is wound in a coil shape. At this time, the type of the rolling oil as a factor affecting the processing temperature and time related to the removal of the rolling oil by batch annealing is a problem, and the width, winding diameter, winding hardness, and the like of the product greatly affect. In particular, the demand for aluminum foil has become increasingly wide and long in recent years, and this is in the direction of increasing the resistance of the rolling oil to loss from the coil, and in order to completely remove the rolling oil. The heat treatment requires a high temperature and a long time for the heat treatment, and inevitably involves softening of the aluminum foil even if it is not desired.

In particular, the rolling oil at the center of the coil at the center of the coil width of the wide and long products is far from the outer surface.
In addition, the distance for escaping from a place where the clearance is narrow (when the winding hardness is hard) is long, the supply of heat is small, and the escaping resistance is large, so it is difficult to further ensure uniformity of the surface characteristics in the width direction. In order to ensure uniformity, annealing at a high temperature for a long time is required, which further promotes the softening of the aluminum foil.

Therefore, it is necessary to completely remove the rolling oil,
Rigid for certain applications that require highly rigid aluminum strips, such as foils for pharmaceutical PTPs, mini cups, or other applications where printing pitch or gap is a problem, such as cap seal materials. High material (for example, 3
003, Al-Fe alloy), even in the case of an aluminum foil that has been subjected to coil annealing for a long time, the softening still proceeds and a decrease in mechanical strength is inevitable, causing various problems.

Therefore, in the production of aluminum foil having high rigidity, the oil adhering in the rolling process during the winding process of the separator or the slitter after rolling is spontaneously evaporated, or the corona is immediately rolled immediately before processing such as printing and bonding. The effects of the residual rolling oil have been removed by performing discharge treatment, anchor coat treatment, and the like. In this case, the effect of the corona discharge treatment becomes weaker as the time elapses after the treatment, so that there is a limitation that the treatment must be performed immediately before the next step. Further, the anchor coating treatment has a disadvantage that the apparatus and process such as a solvent recovery device are complicated for applying an anchor coating agent, evaporating a solvent, and further protecting the environment, and further improvement is required.

On the other hand, a separator used in the manufacturing process of such an aluminum foil is mainly configured such that a soft or hard aluminum foil rolled in two layers is rewound into a single aluminum foil, and is also put into a predetermined width. It has only the function of winding up to the winding length of, and it is not related to the degreasing process, so it has a large amount of residual oil after rolling, or batch annealing (rolling in roll form) In the case of an aluminum foil which is subjected to a high-temperature treatment for a long time as it is, and the degreasing is insufficient, it is necessary to change the batch annealing time to a long time in the former, and to re-batch annealing in the latter.

At present, a batch annealing method for degreasing is the most cost-effective and reliable, and therefore, other methods have not been industrially adopted. However, while most of the other aluminum foil manufacturing processes are continuous, batch annealing stops temporarily because the process is a batch process at this part as shown in the word, and it becomes a bottleneck in the manufacturing process (In the production of aluminum foil,
/ 3. ).

As can be seen from the above description, the degreasing treatment of aluminum foil by batch annealing requires a large portion of time during the manufacturing process, and the softening by annealing of aluminum foil is inevitable even when it is not desired. Therefore, development of a processing method that can overcome these problems has been desired.

[0014]

SUMMARY OF THE INVENTION The present invention relates to a separator provided with a means for removing rolling oil without softening the aluminum foil, and it is possible to perform a degreasing treatment together with separation and width insertion of a double-rolled foil, It is an object of the present invention to develop a separator that can significantly reduce the time even when batch annealing is required if the removal of rolling oil is insufficient after the treatment of the present separator.

[0015]

SUMMARY OF THE INVENTION The present invention provides (a) an outer diameter 1;
The above object has been achieved by developing a rotating roll capable of adjusting the temperature of 50 mmφ or more, and (b) a separator for an aluminum foil, which is provided with a burner for frame-treating the aluminum foil on the roll surface. .

The present invention will be described below with reference to the drawings. The aluminum foil to be used in the present invention is a foil of aluminum or an alloy thereof (about 5 to 200 μm) and a thin metal plate (about 200 μm to 3 mm). As the separator of the present invention, the uncoiler 1 in which the aluminum foil wound in a coil shape is set is separated from the uncoiler 1, and the operability between the winding roll 7 for winding the widened aluminum foil and the convenience of heat dissipation are favorable. One of them is provided with a rotating roll capable of adjusting the temperature. In this case, when it is desired to degrease only one side of the aluminum foil, burners 81, 8 are provided so that both sides of the double-rolled foil can be framed.
2 and burners 81 and 82 when both sides of the separated aluminum foil are to be framed, and burners 83 and 84 for processing the separated inner surface.
Is provided in the separator.

This will be described with reference to FIG. 1. For example, the aluminum foil A from the uncoiler 1 for setting the coil of the double-rolled aluminum foil has the function of preventing wrinkles and keeping the length of the path from unwinding constant. Through a swing roll (not shown), the burners 81 and 82 are subjected to frame processing while being in close contact with the surfaces of at least two rolls 2 and 2 ′ rotating at high speed and capable of adjusting the temperature.

The temperature-adjustable rotating roll is a roll having a smooth surface with a diameter of at least 150 mmφ, preferably 200 mmφ or more.

A plurality of sets of the temperature-controllable rotating rolls and burners for the frame processing may be provided so that the same surface can be processed twice or more when the degree of degreasing is desired in the frame processing.

In the case of a double rolled aluminum foil, both sides of the foil need to be framed.

At this time, the aluminum foil A is applied to the rotating roll.
The wrap angle is at least 120 ° or more to prevent wrinkling of the aluminum foil and avoid overheating of the aluminum foil,
Preferably, the aluminum foil and the roll surface are adhered to each other using an auxiliary roll or the like so that the angle is preferably 180 ° or more (however, if the roll diameter is large, the angle may be small).

There are no particular restrictions on the type of burner, such as a gas burner or an oil burner, but the temperature is much higher (about 1800) than the melting point of aluminum (about 600 ° C.).
° C), the energy supply per unit area of the aluminum foil and the degree of adhesion to the rotating roll are extremely important. Therefore, the rolls 2 and 2 'should be brought into close contact with each other by using a swing roll and a tension roll for keeping the winding angle of the aluminum foil A constant.

The amount of energy supplied per unit area of the aluminum foil includes the thickness of the aluminum foil A, the type of rolling oil, the amount of residual oil on the surface of the foil after rolling, and the target contact angle with pure water (after the frame treatment). It must be determined in consideration of the allowable residual ratio of oil), the allowable annealing degree, and the like, but is generally about 0.1 to 10 kcal / m ² (one side). When more precise conditions are needed, they can be determined by simple tests.

The temperature of the temperature-controllable rotating rolls 2 and 2 'is low, for example, about 40 ° C. or less when annealing is not desired, and it is necessary to increase the temperature as the degree of annealing increases. is there.

The aluminum foil A coming out of the temperature-adjustable rotating rolls 2, 2 'is used to cut the influence of the tension from the cutters (4, 4') and the winding rolls 7, 7 'on the tension of the frame processing system. Nip roll 3,
After passing through 3 ′ (usually one of which is usually rubber), it is cut into a predetermined width by cutters 4 and 4 ′, then separated by separate rolls 5 and 5 ′, and the separated aluminum foil is wound up. It is wound on rolls 7, 7 '. When two sheets are rolled and rolled, the mating surface has a small amount of rolling oil adhered, so that the product can be used as it is as it is. However, when this surface is to be treated, the separate rolls 5 and 5 'are made temperature-controllable rolls, 8
The frame processing may be performed here using 3, 84, or a roll and a burner for frame processing may be separately provided and processed there. The treated aluminum foil A is separated and wound up on a winding roll to a predetermined length.

Although the processing speed varies depending on various factors, the maximum processing speed of 800 m / min is usually sufficient. In addition, since the frame processing portion is heated to a high temperature, it is necessary to attach a heat exhausting device so that the heat does not accumulate or to take care to shut off the heat.

By the flame treatment, the rolling oil is greatly reduced, and a hard aluminum foil degreased is obtained. In addition, when the degree of degreasing is insufficient in this treatment, or when the annealing by the flame treatment is insufficient, normal batch annealing may be performed.In this case, the annealing time is set by removing the rolling oil. Instead, the annealing time can be set simply based on the degree of annealing, and the production of a soft hard foil due to excessive annealing can be completely avoided.

Another feature of the frame processing product is that
It has good uniformity of surface characteristics (water wettability, oxide film thickness, etc.) in the width direction and length direction of aluminum foil like a batch-annealed product, and can produce degreased aluminum foil at high speed. The separator is a device that makes this possible.

[0029]

The aluminum foil to which the rolling oil has adhered is brought into close contact with the surface of a rotating roll having an outer diameter of at least 150 mm whose temperature can be adjusted, and a part of the adhered portion is treated with a high-temperature frame to reduce the rolling oil. This is a separator for aluminum foil with a built-in removal device.

In this case, the frame surface is exposed to a high temperature such as about 1800 ° C., but because it is in close contact with the rotating roll, the entire aluminum foil itself does not become hot, only a part of its surface becomes hot, and the rolling oil It is presumed that almost no annealing of the aluminum foil itself occurred due to incineration or volatilization.

In particular, since the present invention is a separator having a built-in frame processing apparatus which supplies a large amount of energy, it is not only necessary to separate the aluminum foil, insert the aluminum foil into a predetermined width, and wind the aluminum foil into a predetermined winding length, but also to perform annealing. It is a separator for aluminum foil that can be reduced in amount or simultaneously with annealing.

[0032]

[Example] 30 μm thick and 600 mm wide as a sample
The two rolls of rolled foil are used as a rotating roll capable of adjusting the temperature, and two sets of a water-cooled roll having an outer diameter of 200 mmφ and a burner for frame-treating the aluminum foil on the surface of the water-cooled roll are provided. The foil was separated and subjected to a frame treatment through the provided separator. Next, the frame-treated aluminum foil was subjected to batch annealing at a temperature of 240 ° C, and the time required for batch annealing until the contact angle with water became 30 ° was determined. Table 1 shows the results.

[0033]

[Table 1] (1) Until the contact angle reaches 30 °

As a result, it was confirmed that the separation and degreasing of the double rolled foil were simultaneously performed, and the time required for batch annealing could be greatly reduced to about 1/2.

[0035]

The separator for an aluminum foil of the present invention is a separator having the following effects. (1) Separation, slitting, and degreasing steps of the two-layer rolled foil can be performed at once, and even if it is necessary to add a degreasing step by batch annealing, the lead time can be greatly reduced. (2) Since the degreasing treatment is performed by the flame treatment, the surface properties (water wettability, oxide film thickness, etc.) in the width direction and the length direction are more uniform than the batch annealing, and high-speed treatment is possible. (3) The hard foil slit product can be degreased. (4) Pre-processing of laminator processing for soft slit products,
Pretreatment such as corona discharge machining on the user side is not required. (5) By performing a frame treatment on a heating roll, the hard foil is changed into a semi-hard foil or a soft foil, and the aluminum foil is excellent in degreasing. This flame treatment makes it possible to produce an aluminum foil having the same strength as CAL because of heating and cooling for a short time.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of an aluminum foil separator of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Uncoiler 2 Rotation roll which can adjust temperature 2 'Rotation roll which can adjust temperature 3 Nip roll 3' Nip roll 4 Cutter 4 'Cutter 5 Separate roll 5' Separate roll 6 Touch roll 6 'Touch roll 7 Take-up roll 7' Take-up roll 81 Burner for frame processing 82 Burner for frame processing 83 Burner for frame processing 84 Burner for frame processing A Aluminum foil

──────────────────────────────────────────────────続 き Continued on the front page (72) Eizo Isoyama Inventor Showa Aluminum Co., Ltd. 6, 224 Kaiyama-cho, Sakai-shi, Osaka (56) References Japanese Utility Model 63-123670 (JP, U) (58) ) Surveyed field (Int.Cl. ⁷ , DB name) C22F 1/04 B21B 45/02 C23G 5/00

Claims (3)

(57) [Claims] 1. A separator for aluminum foil, comprising: (a) a rotating roll having an outer diameter of at least 150 mmφ and capable of adjusting the temperature; and (b) a burner for frame-treating the aluminum foil on the roll surface. 2. The aluminum foil separator according to claim 1, wherein an auxiliary roll is provided so that an angle at which the aluminum foil is wound around the rotating roll is 120 ° or more. 3. The separator for aluminum foil according to claim 1, wherein the rotating roll whose temperature can be adjusted is a cooling roll or a heating roll at 300 ° C. or lower.