JPH0633203A - Separator for aluminum foil having degreasing function - Google Patents

Abstract

PURPOSE:To remarkably reduce the time of degreasing treatment and batch annealing by providing the separator with rotary rolls capable of controlling the temp. of flaming treatment by burners. CONSTITUTION:Al foil in an adhesive state is subjected to flaming treatment from an uncoiler 1 setting the coil of Al foil finished with double lap rolling to the surface of at least two pieces of rolls 2 and 2' capable of temp. control and rotating at a high speed by burners 81 and 82. The swing roll and tension roll are arranged so that they will have smooth surfaces in such a manner that the diameter of the rolls 2 and 2' is regulated to at least 150mmphi, preferably to >=200mmphi and the winding angle of the Al foil will be regulate to >=120 deg.C, preferably to 180 deg.C. The amt. of energy to be fed per unit area of the Al foil in the flaming treatment by the burners 81 and 82 is regulated to 0.1 to 10Kcal/m<2> (per a side).

Description

Detailed Description of the Invention

[0001]

The present invention relates to an aluminum foil obtained by rolling two aluminum foils after rolling (in the present invention, an aluminum foil means a foil of aluminum or an aluminum alloy) and separating them. With a single aluminum foil, a device for cutting and winding into a predetermined width and length, and in a single foil a device for cutting and winding into a predetermined width and length, The present invention relates to an aluminum foil separator capable of simultaneously removing rolling oil adhering to the surface of an aluminum foil.

[0002]

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

In particular, in the fields of packaging materials, electrical materials, daily necessities, ornaments, industrial materials, etc., aluminum foils (about 5 μm to 200 μm) for use in them are produced in large quantities.

These aluminum foils are generally rolled by rolling a slab-shaped aluminum lump, particularly two foils in the case of a thin foil, and the surface after rolling is rolled with the rolling oil used at the time of rolling. It adheres, and if left as it is, it often becomes an obstacle in secondary processing of aluminum foil such as printing and lamination.

For this reason, it is usual to anneal the aluminum foil, which is cut into a predetermined size through a separator and also serves as degreasing (removal of rolling oil). This annealing is often performed with the aluminum foil wound in a coil.

In the case of aluminum foil, the softening of the material by degreasing and annealing simultaneously progresses, and the annealing time becomes long due to degreasing.

That is, at present, the rolling oil adhering to the surface of the aluminum foil is usually removed by so-called batch annealing, in which the separated aluminum is subjected to a heat treatment for a long time while being wound in a coil shape. At this time, the type of rolling oil is a problem as a factor affecting the processing temperature and time for removing rolling oil by batch annealing, and the product width, winding diameter, winding hardness, etc. have a great influence. Aluminum foil, in particular, has recently become more and more demanded for wider and longer products, but this is in the direction of increasing resistance to loss of rolling oil from the coil, and in order to completely remove rolling oil. Requires a high temperature and a long time for the heat treatment, and the aluminum foil is necessarily softened even if not desired.

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, it is far from the outer surface,
In addition, the distance to lose from a place with a narrow clearance (when the winding hardness is hard) is long, the heat supply is small, and the loss resistance is large, so it is difficult to secure more even surface property in the width direction. In order to secure the uniformity, high temperature and long time annealing are required, which further promotes softening of the aluminum foil.

Therefore, it is necessary to completely remove the rolling oil,
Rigidity for specific applications requiring highly rigid aluminum strips, such as PTP foils for pharmaceuticals, mini cups, etc., or applications such as cap sealing materials where printing pitch or misalignment is a problem High-quality materials (eg 3
(003, Al-Fe alloy), the aluminum foil that has been coil annealed for a long time is still softened and the mechanical strength is unavoidably deteriorated, which causes various problems.

Therefore, in the production of a highly rigid aluminum foil, the oil adhered in the rolling process is naturally evaporated during the winding process in the separator or slitter after rolling, or the corona is formed immediately before processing such as printing or 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 the apparatus and the process such as a solvent recovery device are complicated for the application of the anchor coat agent, the evaporation process of the solvent, and the environmental protection, and further improvement is required.

On the other hand, the separator used in the manufacturing process of such an aluminum foil is mainly composed of two rolled aluminum foils, such as soft and hard materials, which are rewound into a single aluminum foil and are then widened to a predetermined width. Since it is a device that only has the function of winding up to the winding length of, and is a device that is not related to degreasing treatment, if there is a large amount of residual oil after rolling, or batch annealing (rolled into a roll) In the case of aluminum foil, which is a product which is treated at high temperature for a long time as it is and is not sufficiently degreased, it was necessary to change the batch annealing time to a long time in the former case and re-batch annealing in the latter case.

At present, the method of batch annealing for degreasing has the best cost performance and is reliable, and therefore other methods are industrially rarely used. However, while most of the other aluminum foil manufacturing processes are continuous, batch annealing is a batch process at this part as indicated by the word, so it is temporarily stopped and becomes a neck point of the manufacturing process. (For aluminum foil manufacturing, it is one of the manufacturing lead types.)
Occupy / 3. ).

As can be seen from the above description, the degreasing treatment of an aluminum foil by batch annealing requires a large amount of time during the manufacturing process, and even when it is not desired, softening of the aluminum foil due to annealing is inevitable. Therefore, it has been desired to develop a treatment method capable of overcoming these problems.

[0014]

DISCLOSURE OF THE INVENTION The present invention is a separator provided with a means for removing rolling oil without softening an aluminum foil, which is capable of performing degreasing treatment together with separation of two-layer rolled foil, width insertion, etc., The purpose of the present invention is to develop a separator which can significantly reduce the time even if batch annealing is required because the removal of rolling oil is insufficient after the treatment of this separator.

[0015]

The present invention provides (a) an outer diameter 1
The above object was achieved by developing a separator for aluminum foil, which comprises a rotating roll having a temperature control of 50 mmφ or more, and (b) 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 which is the subject of the present invention is a foil of aluminum or its alloy (about 5 to 200 μm) and a thin metal plate (about 200 μm to 3 mm). As the separator of the present invention, the coiled aluminum foil is separated from the uncoiler 1 that is set, and the operability between the winding rolls 7 for winding the width-filled aluminum foil and the convenience of heat dissipation are convenient. One of them is provided with a rotating roll whose temperature can be adjusted. In this case, when it is desired to degrease only one side of the aluminum foil, the burners 81, 8 are provided so that both sides of the double-rolled rolled foil can be frame-treated.
2 is added to the burners 81 and 82 when it is desired to frame both sides of the separated aluminum foil, and burners 83 and 84 for treating the separated inner surface are added.
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 double-rolled rolled-up aluminum foil has the functions of preventing wrinkles and making the length of the path from unwinding constant. After passing through a swing roll (not shown), at least two rolls 2 and 2'rotatable at high speed capable of temperature adjustment are in close contact with each other and subjected to a flame treatment of burners 81 and 82.

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.

The set of the temperature-adjustable rotating roll and burner for flame treatment may be provided in plural sets so that the same surface can be treated more than once when it is desired to increase the degreasing degree in flame treatment.

When the aluminum foil is a double-rolled aluminum foil, it is necessary to frame both sides of the foil.

At this time, the aluminum foil A for the rotating roll
The wrap angle of the aluminum foil is at least 120 ° or more to prevent wrinkling of the aluminum foil and avoid overheating of the aluminum foil.
It is preferable that the aluminum foil and the roll surface are brought into close contact with each other by using an auxiliary roll or the like so that the angle is 180 ° or more (however, when the roll diameter is large, the angle may be smaller).

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

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

The temperature of the rotatable rolls 2 and 2 ′ whose temperature can be adjusted is low, for example, about 40 ° C. or lower when annealing is not desired, and it is necessary to increase the temperature as the annealing degree increases. is there.

The aluminum foil A discharged from the temperature-adjustable rotating rolls 2, 2'cuts the influence of the tension from the cutter (4, 4 '), the winding rolls 7, 7', etc. on the tension of the frame processing system. Nip roll 3,
After passing through 3 '(usually one is usually rubber), it is put into a predetermined width by cutters 4, 4', then separated by separate rolls 5, 5 ', and the separated aluminum foil is wound up. It is wound up on rolls 7 and 7 '. When two rolls are rolled, the mating surface has a small amount of rolling oil attached, so it can be used as it is, but if you want to process this surface, separate rolls 5 and 5'can be temperature-adjustable rolls and burner can be used. 8
3, 84 may be used for frame processing here, or a frame processing roll and burner may be separately provided and processed there. The treated aluminum foil A is separated and wound on a winding roll to a predetermined length.

The processing speed varies depending on various factors, but a maximum of 800 m / min is usually sufficient. Since the frame processing part becomes hot, it is necessary to attach an exhaust heat device so that heat does not stay, or to take measures so that the heat can be shut off.

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

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

[0029]

The aluminum foil having the rolled rolling oil adhered is adhered to the surface of at least an outer diameter 150 mmφ rotating roll whose temperature can be adjusted, and a part of the adhered portion is treated with a high-temperature frame to remove the rolling oil. It 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 since it is in close contact with the rotating roll, the entire aluminum foil itself does not reach a high temperature, and only a part of the surface thereof becomes a high temperature. It is presumed that the aluminum foil itself was hardly annealed due to incineration or volatilization.

In particular, since the present invention is a separator incorporating a frame processing device with a large amount of energy supply, it is possible not only to separate aluminum foil, insert a predetermined width and wind it into a predetermined winding length, but also to anneal it. It is a separator for aluminum foil that can be little or annealed at the same time.

[0032]

[Example] A sample having a thickness of 30 μm and a width of 600 mm
The double-layer rolled foil of No. 2 is a water-cooled roll having an outer diameter of 200 mmφ as a temperature-adjustable rotating roll, and two sets of burners for frame-treating the aluminum foil on the surface of the water-cooled roll (both sides of the double-layer foil are frame-treated. The foil was separated and frame-treated 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 reached 30 ° was obtained. The results are shown in Table 1.

[0033]

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

As a result, it was confirmed that the two-layer rolled foil was separated and degreased at the same time, and the time required for batch annealing could be significantly reduced to about 1/2.

[0035]

The separator for aluminum foil of the present invention is a separator that exhibits the following effects. (1) The separation, slitting and degreasing steps of the double-layer rolled foil can be performed all at once, and even if the degreasing step by batch annealing is required, the lead time can be greatly saved. (2) Since it is a degreasing treatment by flame treatment, the surface characteristics (water wettability, oxide film thickness, etc.) in the width direction and the length direction are better than in batch annealing, and high-speed treatment is possible. (3) Hard foil slit products can be degreased. (4) Pretreatment for laminator processing of soft slit products is possible,
Pre-treatment such as corona discharge machining on the user side is unnecessary. (5) By performing frame treatment on a heating roll, the hard foil is changed to a semi-hard foil or a soft foil, and an aluminum foil with good degreasing is obtained. This flame treatment makes it possible to produce an aluminum foil having a strength comparable to that of CAL because it is heated and cooled for a short time.

[Brief description of drawings]

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

[Explanation of symbols]

 1 Uncoiler 2 Rotating Roll with Adjustable Temperature 2'Rotating Roll with Adjustable Temperature 3 Nip Roll 3'Nip Roll 4 Cutter 4'Cutter 5 Separate Roll 5'Separate Roll 6 Touch Roll 6'Touch Roll 7 Winding Roll 7'Winding Roll 81 Frame Processing Burner 82 Frame Processing Burner 83 Frame Processing Burner 84 Frame Processing Burner A Aluminum Foil

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Eizo Isoyama 6-224 Kaiyamacho, Sakai City, Osaka Prefecture Showa Aluminum Co., Ltd.

Claims (3)

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