JP2006207034A - Method for producing aluminum foil annealed coil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing an aluminum foil annealed coil particularly having reduced production of wrinkles regarding an efficient using method for an annealing furnace for a rolled aluminum foil coil. <P>SOLUTION: The method for producing an aluminum foil coil comprises a stage where aluminum is subjected to lubrication rolling so as to produce aluminum foil; a stage where the aluminum foil is made into a coil; a stage where the aluminum foil coil is immediately heated and held to 300 to 350°C by an annealing furnace or a stage where a heat insulating material having the width equal to the width of a product to the width of 1/3 of the product is wrapped around the aluminum foil coil; a stage where, after the heating and holding at 300 to 350°C, without discharging the aluminum foil coil from the annealing furnace, the temperature in the annealing furnace is controlled to 100 to 300°C; a stage where, at the point of the time the temperature in the annealing furnace reaches 100 to 300°C, the aluminum foil coil is taken out from the annealing furnace; a stage where a heat insulating material having the width equal to the width of product width to the width of 1/3 of the product is wrapped around the taken-out aluminum foil coil; and a stage where, in a state the heat insulating material is wrapped around the aluminum foil coil, it is left to cool. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an efficient method of using an annealing furnace in annealing a rolled aluminum foil coil, and more particularly, to a method for manufacturing an aluminum foil annealed coil with less wrinkling due to cooling even when the aluminum foil is thin.

  Aluminum foil is used in a wide range of fields, and there are demands for many types of materials such as material, width, and thickness depending on the application. Most of these are commercially available as O materials (soft materials) annealed after rolling. Rolling is roughly divided into a coil annealing method in which an aluminum foil is wound in a coil shape and heated for a long time in an annealing furnace, and a frame annealing method in which the aluminum foil is annealed by passing through a high-temperature flame. It is processed by a coil annealing method that can process a large amount of aluminum foil coils at once. The annealing of the aluminum foil varies depending on the type and purpose of the aluminum material, but in general, the annealing temperature is 300 to 350 ° C., the annealing time is about 20 to 100 hours, and the product diameter increases, and the coil winding diameter increases. It is said that annealing time will become long, so that it is large. This annealing is not only for the purpose of annealing the aluminum foil, but also for the purpose of removing the rolling oil used during rolling, so that the heat penetrates into the coil in the annealing furnace, so the whole is uniform. In addition to gradually heating and annealing, it is necessary to volatilize the rolling oil between the aluminum foils (Patent Document 1), which requires a long annealing time.

  After the annealing, the aluminum foil annealed coil is annealed at a high temperature (approximately 200 ° C. or higher) after the prescribed annealing, and when the temperature falls below this region, the cooling rate is increased, When it falls below 100 ° C., it is removed from the annealing furnace. In order to avoid the generation of wrinkles in the cooling in the furnace, in the high temperature region, the process controller cools at a rate of about 10 ° C./hour. When the temperature is higher than 150 ° C., particularly 150 ° C. or more, the difference between the coil temperature and the outside air temperature becomes large, and the coil surface is rapidly cooled in the cooling process. It becomes easy to do. For this reason, in order to prevent the generation of wrinkles in the cooling of the aluminum foil annealing coil, the temperature is slowly lowered in the annealing furnace (Patent Document 2), the method is as close as possible to the outside air temperature, and then removed from the annealing furnace, or Assuming generation of wrinkles in the coil, a method is adopted in which a large amount of aluminum foil is wound in advance as an extra scale to remove wrinkles generated by cooling. In the former method, since the cooling of the aluminum foil coil after annealing that requires a long time is performed in the annealing furnace, the productivity of the annealing furnace is low, and the cooling rate decreases particularly as the temperature decreases, so that the cooling rate becomes 100 ° C. or less, or The time required for cooling to around 100 ° C. requires several times the vicinity of the annealing temperature even if the temperature difference is the same 10 ° C. Further, when the latter method is used, a portion of 1 to 3 mm from the coil surface is discarded, so that the yield of the aluminum foil is lowered and both have problems.

  In this case, when the aluminum foil coil is loosely wound so as to reduce the generation of wrinkles, the coil tends to collapse, and when the winding state is hardened, wrinkles are likely to occur. When the aluminum foil is thick, the generation of wrinkles is small, but when the thickness is less than 10 microns, the generation of wrinkles tends to increase.

Japanese Examined Patent Publication No. 39-22129 Japanese Patent Laid-Open No. 06-108209

  The present invention relates to an effective method of using an annealing furnace in which the annealing temperature in the annealing furnace is shortened by increasing the temperature at which the annealing coil is heated in the coil annealing method for aluminum foil, and the time for occupying the annealing furnace is shortened. The object of the present invention is to develop a manufacturing method that does not generate wrinkles even when the coil is made of a thin aluminum foil with a fast cooling rate and a thin cooling rate.

The present invention
[1] Lubricating and rolling aluminum into an aluminum foil, winding the aluminum foil into a coil, heating and holding the aluminum foil coil at 300 to 350 ° C. in an annealing furnace, and heating and holding at 300 to 350 ° C. The step of setting the temperature in the annealing furnace to 100 to 300 ° C. without taking out the aluminum foil coil from the annealing furnace, the step of taking out the aluminum foil coil from the annealing furnace when the temperature in the annealing furnace reaches 100 to 300 ° C., taking out A step of winding a product width to 1/3 of the product width to the aluminum foil coil (a heat insulating material), a method of manufacturing an aluminum foil coil that is allowed to cool in a state where the heat insulating material (the heat insulating material) is wound around the aluminum foil coil
[2] Lubricating and rolling aluminum into an aluminum foil, winding an aluminum foil into a coil, winding an aluminum foil coil with a product width to 1/3 of the product width (heat insulating material), heat insulation The step of heating and holding the aluminum foil coil around which the material (heat insulating material) is wound at 300 to 350 ° C. in an annealing furnace, the temperature in the annealing furnace is set to 100 without removing the aluminum foil coil from the annealing furnace after heating and holding at 300 to 350 ° C. A step of ˜300 ° C., a step of removing the aluminum foil coil from the annealing furnace when the temperature in the annealing furnace reaches 100 ° C. to 300 ° C., and an aluminum foil coil that is allowed to cool in a state where a heat insulating material (heat insulating material) is wound. Production method,

[3] In the cooling step after holding the aluminum foil coil at the annealing temperature, the aluminum foil coil is taken out of the furnace when the furnace temperature reaches 100 to 300 ° C., and the product width or 1/3 of the product width is added to the coil. A method of manufacturing an aluminum foil annealing coil that is cooled outside the furnace in a state where a heat insulating material (heat insulating material) is wound,
[4] In the cooling step after maintaining the annealing temperature of the aluminum foil coil, the aluminum foil coil is annealed in a state where a heat insulating material (heat insulating material) of 1/3 of the product width to the product width is wound beforehand. Then, the furnace temperature is rapidly cooled to 100 to 300 ° C., then the heat insulating material (heat insulating material) is taken out from the furnace while being wound, and is cooled outside the furnace as it is.

[5] The method for producing an aluminum foil annealed coil according to any one of the above [1] to [4], wherein the aluminum foil is a rolled foil of pure aluminum and an alloy mainly composed of aluminum,
[6] The method for producing an aluminum foil annealed coil according to any one of [1] to [5], wherein the thickness of the aluminum foil is less than 20 microns,
[6] At the center of the aluminum foil coil, the product is wound with a heat insulating material (heat insulating material) of 1/3 of the product width to the product width and then cooled by annealing, or at the center of the aluminum foil coil taken out from the furnace, The method for producing an aluminum foil annealed coil according to any one of the above [1] to [5], wherein the product is wound with a heat insulating material (heat insulating material) having a width of 1/3 of the product width to the product width, and cooled.

[8] In the cooling step after maintaining the aluminum foil coil at the annealing temperature, the aluminum foil coil is taken out of the furnace when the furnace temperature reaches 100 to 300 ° C., and the product width or 1/3 of the product width is added to the coil. [9] In the cooling step after maintaining the annealing temperature of the aluminum foil coil, the aluminum foil coil is pre- Annealing is performed in a state where a heat insulating material (heat insulating material) of 1/3 of the product width is wound, and the furnace temperature is rapidly cooled to 100 to 300 ° C. in that state, and then the heat insulating material (heat insulating material) is wound. The above problem was solved by developing an aluminum foil annealed coil that was taken out of the furnace and cooled as it was outside the furnace.

  In the coil annealing method using an annealing furnace according to the present invention, in the first invention, by raising the furnace temperature of the aluminum foil coil to 100 to 300 ° C., the cooling process in the annealing furnace is greatly shortened, A heat insulating material (heat insulating material) was used for cooling outside the furnace, and an efficient method of using the annealing furnace could be established by covering the surface of the extracted high temperature aluminum foil coil. In the second invention, the aluminum foil annealing coil is pre-wound with a heat insulating material (heat insulating material) and then annealed. In cooling, cooling is performed at a speed higher than the conventional cooling rate, and the temperature is set to 100 than before. When the heat insulating material (heat insulating material) is taken out in a high temperature state of ˜300 ° C. and cooled in that state, not only annealing is sufficiently possible, but also cooling without wrinkle is possible. It was. In particular, by any of the methods of the present invention, the generation of wrinkles can be prevented in the annealing of aluminum foil coils of 20 microns or less which are relatively easy to generate wrinkles, and the cooling time in the annealing furnace can be greatly shortened. Efficient use is possible.

  The aluminum foil of the present invention is effective when applied to a rolled foil of ordinary pure aluminum and an aluminum-based alloy, particularly a thin aluminum foil having a thickness of less than about 20 microns. The annealing process of the aluminum foil according to the first and second inventions of the present invention may be the same as the conventional coil annealing method in the annealing temperature and annealing time. Usually, the annealing temperature is 300 to 350 ° C., and the annealing time is 20 to 150 hours. In the conventional method, taking out of the aluminum foil coil from the furnace in the post-annealing cooling step is different depending on the temperature of the annealing furnace and the size of the product, but usually requires about 5 to 20 hours. This is an unavoidable time for preventing the generation of wrinkles on the surface of the aluminum foil annealing coil, which has been a major factor in reducing the productivity of the annealing furnace.

  In the first invention of the present invention, the annealed aluminum foil coil is compared such that the temperature of the annealing furnace is 100 to 300 ° C., preferably 150 to 210 ° C. without generating wrinkles on the surface of the aluminum foil coil. It was successfully taken out at a very high temperature. When such a high temperature annealing coil is cooled as it is in the outside air as before, the coil surface is rapidly cooled and wrinkles are inevitable. It is necessary to cover it with a heat insulating material and cool it gradually outside the furnace, or if possible, it is preferable to wind a heat insulating material in advance before putting the aluminum foil coil into the annealing furnace. Depending on the size of the aluminum foil coil, as a heat insulating material (heat insulating material), if a heat insulating material (heat insulating material) is used so that the outside temperature is reached in 6 to 48 hours when the furnace discharge temperature is around 250 ° C. good. As a preferable one, for example, a heat-resistant felt (GC-1600 manufactured by Huseas) having a thickness of 5 to 10 mm, particularly 6 mm is preferable. Other than this, there are glass wool, asbestos, etc., but each has advantages and disadvantages and is difficult to use.

  In general, when setting the furnace temperature of aluminum foil coils to a high value, it is necessary to use a heat insulating material (heat insulating material) that has a high heat insulating property (heat insulating material) and is close to the product width, whereas When the temperature is set low, the heat insulating property of the heat insulating material (heat insulating material) is low, and it may be narrower than the product width (at least 1/3 or more of the product width is necessary). For example, when the furnace discharge temperature is around 200 ° C., it is most preferable to cover the whole of the aluminum foil coil with a heat insulating material (heat insulating material), but when the furnace discharge temperature is as low as 120 to 160 ° C., the product width is about 1 A 3/3 heat insulating material (heat insulating material) is wound so as to cover the central portion of the coil where wrinkles are most likely to occur, and is gradually cooled. When the width of the heat insulating material (heat insulating material) is less than about 1/3 of the product width, the portion not covered with the heat insulating material may wrinkle, and for safety, at least about 1/3. It is preferable to use a heat insulating material (heat insulating material) having the above width.

  In the second invention of the present invention, the aluminum foil annealing coil is wound with a heat insulating material (heat insulating material) before being fed into the annealing furnace, and is annealed in the same manner as in the conventional method. At the end of annealing, conventionally, the process controller slowly cooled in the high temperature region and cooled at a faster cooling rate when it became the low temperature region. The aluminum foil annealing coil is cooled at a relatively rapid cooling rate (about 15 to 30 ° C./hour) about 1.5 to 3.0 times the cooling rate of the conventional method in a high temperature region. When the temperature reaches 100 to 300 ° C., it is possible to completely remove the rolling oil even if it is taken out from the annealing furnace with the heat insulating material (heat insulating material) wound, and the annealing is sufficiently performed and wrinkles are generated. It became possible to cool outside the furnace without any trouble.

[Examples 1 to 5]
A 1N30 rolled coil with a foil thickness of 7 microns, a width of 1000 mm, and a weight of 240 kg is wound on a 1N30 rolled coil with a heat insulating material having a thickness of 6 mm as shown in Table 1 (those narrower than the product width are wound around the center). After annealing at 300 ° C. for 20 hours in the furnace, the furnace was left to cool until the atmospheric temperature of the annealing furnace reached a predetermined temperature, and then cooled down to 3 hours after the furnace and allowed to cool to the next day. The situation of the later coil was examined. The results are shown in Table 1.

[Example 6]
The same operation as in Example 4 was performed except that the annealing temperature was 350 ° C., the cooling rate in the furnace was increased, and the furnace discharge temperature was 250 ° C. The results are shown in Table 1.
[Example 7]
It annealed without winding a heat insulating material at the time of annealing, and performed similarly to Example 4 except winding a heat insulating material after a furnace exit. The results are shown in Table 1.

[Comparative Examples 1-4]
Annealing was performed in the same manner as in the example except that the annealing was performed in advance without winding the heat insulating material, and the furnace was left at the predetermined temperature and allowed to cool as it was. The results are shown in Table 1.
[Comparative Example 5]
As in Example 4, except that the annealing temperature was set to 350 ° C., the product width heat insulating material was wound around an aluminum foil annealing coil and annealed, and then immediately after the annealing without cooling in the furnace. And cooled. The results are shown in Table 1.

  The present invention provides an aluminum foil coil annealing method in which the annealing temperature of the annealing coil is shortened by increasing the annealing temperature of the annealing coil, the time occupied by the annealing furnace of the aluminum foil annealing coil is shortened, and In addition to increasing the cooling rate of the furnace after annealing and developing an efficient method of using the annealing furnace, we have developed a method for producing aluminum foil that does not generate wrinkles even when it is a thin aluminum foil coil. .

Claims (9)

  The process of lubricating and rolling aluminum into aluminum foil, the process of making aluminum foil into a coil, the process of heating and holding the aluminum foil coil at 300 to 350 ° C. in an annealing furnace, and the aluminum foil coil after heating and holding at 300 to 350 ° C. The step of setting the temperature in the annealing furnace to 100 to 300 ° C. without taking out from the annealing furnace, the step of taking out the aluminum foil coil from the annealing furnace when the temperature in the annealing furnace reaches 100 to 300 ° C., the taken out aluminum foil A method for producing an aluminum foil coil, including a step of winding a heat insulating material (heat insulating material) of a product width to 1/3 of the product width around the coil, and a step of allowing the aluminum foil coil to cool in a state where the heat insulating material (heat insulating material) is wound .   A process of lubricating and rolling aluminum into an aluminum foil, a process of making an aluminum foil into a winding coil, a process of winding a heat insulating material (heat insulating material) of the product width to 1/3 of the product width around the aluminum foil coil, a heat insulating material (heat insulating material) The step of heating and holding the aluminum foil coil wound with the material at 300 to 350 ° C. in the annealing furnace, the temperature in the annealing furnace is set at 100 to 300 ° C. without taking out the aluminum foil coil from the annealing furnace after heating and holding at 300 to 350 ° C. An aluminum foil coil including a step of removing the aluminum foil coil from the annealing furnace when the temperature in the annealing furnace reaches 100 to 300 ° C., and a step of allowing to cool in a state where a heat insulating material (heat insulating material) is wound. Manufacturing method.   In the cooling step after the aluminum foil coil is kept at the annealing temperature, the aluminum foil coil is taken out of the furnace when the furnace temperature reaches 100 to 300 ° C., and the product is heat-insulated with a product width or 1/3 of the product width. The manufacturing method of the aluminum foil annealing coil which cools outside a furnace in the state wound (thermal insulation).   In the cooling step after maintaining the annealing temperature of the aluminum foil coil, the aluminum foil coil is annealed in a state in which a heat insulating material (heat insulating material) of 1/3 of the product width to the product width is wound beforehand, and the furnace temperature is maintained in that state. Is rapidly cooled to 100 to 300 ° C., then taken out from the furnace with the heat insulating material (heat insulating material) wound, and cooled outside the furnace in the same state.   The method for producing an aluminum foil annealed coil according to any one of claims 1 to 4, wherein the aluminum foil is a rolled foil of an alloy mainly composed of pure aluminum and aluminum.   The method for producing an aluminum foil annealed coil according to any one of claims 1 to 5, wherein the thickness of the aluminum foil is less than 20 microns.   At the center of the aluminum foil coil, the product width or 1/3 of the product width is wound with a heat insulating material (heat insulating material) and annealed to cool, or at the center of the aluminum foil coil taken out of the furnace, the product width to The manufacturing method of the aluminum foil annealing coil of any one of Claim 1 thru | or 6 which winds and cools with the heat insulating material (heat insulating material) of 1/3 of a product width.   In the cooling step after the aluminum foil coil is kept at the annealing temperature, the aluminum foil coil is taken out of the furnace when the furnace temperature reaches 100 to 300 ° C., and the product is heat-insulated with a product width or 1/3 of the product width. An aluminum foil annealing coil manufactured outside the furnace in a state in which a (heat insulating material) is wound. In the cooling step after maintaining the annealing temperature of the aluminum foil coil, the aluminum foil coil is annealed in a state in which a heat insulating material (heat insulating material) of 1/3 of the product width to the product width is wound beforehand, and the furnace temperature is maintained in that state. The aluminum foil annealed coil manufactured by rapidly cooling to 100 to 300 ° C., then taking out the heat insulating material (heat insulating material) from the furnace while winding it, and cooling it outside the furnace as it is.