WO2015019960A1 - Aluminum foil for visible-light-reflecting material and method for producing said foil - Google Patents

Aluminum foil for visible-light-reflecting material and method for producing said foil Download PDF

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Publication number
WO2015019960A1
WO2015019960A1 PCT/JP2014/070347 JP2014070347W WO2015019960A1 WO 2015019960 A1 WO2015019960 A1 WO 2015019960A1 JP 2014070347 W JP2014070347 W JP 2014070347W WO 2015019960 A1 WO2015019960 A1 WO 2015019960A1
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Prior art keywords
aluminum foil
less
rolling
surface roughness
aluminum
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PCT/JP2014/070347
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French (fr)
Japanese (ja)
Inventor
享 新宮
光成 大八木
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東洋アルミニウム株式会社
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Application filed by 東洋アルミニウム株式会社 filed Critical 東洋アルミニウム株式会社
Priority to JP2015530857A priority Critical patent/JP6370298B2/en
Priority to KR1020167003810A priority patent/KR102228365B1/en
Priority to CN201480043547.8A priority patent/CN105451903B/en
Publication of WO2015019960A1 publication Critical patent/WO2015019960A1/en

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/40—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling foils which present special problems, e.g. because of thinness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
    • C22C21/08—Alloys based on aluminium with magnesium as the next major constituent with silicon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B21B2003/001—Aluminium or its alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/14—Roughness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/14—Reduction rate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2267/00—Roll parameters
    • B21B2267/10—Roughness of roll surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/02—Shape or construction of rolls
    • B21B27/021—Rolls for sheets or strips

Definitions

  • the present invention relates to an aluminum foil for a visible light reflecting material and a method for producing the same.
  • the term “aluminum foil” is used to include not only pure aluminum foil but also aluminum alloy foil.
  • the reflective material used reflects the electromagnetic wave called light with minimal loss, and at the same time, in order to transmit and collect the reflected electromagnetic wave without waste to a predetermined location, the electromagnetic wave is not scattered as much as possible. It is desired to reflect. That is, an important performance required for the reflecting material is that regular reflection of reflecting an electromagnetic wave at the same angle as the incident angle to the reflecting material is performed with a minimum energy loss.
  • the degree of regular reflection is evaluated by the numerical value defined by the glossiness (JIS Z 8740).
  • the glossiness is evaluated based on the amount of light received from one direction by receiving light incident at a specific angle ⁇ , for example, 60 °, and receiving light reflected at a specific angle ⁇ , for example, 60 °.
  • Examples of the reflective material having a high degree of regular reflection and a high reflectance in the visible light region include silver and aluminum.
  • aluminum is attracting attention as an application of a visible light reflecting material as a material having a small density, light weight, good thermal conductivity, and relatively inexpensive among metals and having a high reflectance.
  • the glossiness is generally about 60 to 70% as the reflection characteristic of the aluminum foil.
  • Patent Document 2 Japanese Patent Laid-Open No. 2002-143904 (hereinafter referred to as Patent Document 2), as a method for producing a high-gloss aluminum plate, the aluminum plate is subjected to final finish cooling by a rolling roll surface-finished by film polishing or kiss roll polishing. It is described that it is rolled. Using this method, an aluminum plate having a surface roughness Ra of about 0.20 to 0.60 ⁇ m is obtained by transferring the low surface roughness of the polished roll onto the surface of the aluminum plate.
  • Patent Document 2 Japanese Patent Laid-Open No. 2002-143904
  • glossiness is generally about 60 to 70% as a reflection characteristic of an aluminum foil.
  • the glossiness is 82.2 at the maximum. % Aluminum foil can be obtained. An aluminum foil having such a gloss level cannot meet the application of a reflector having a higher reflectance.
  • an object of the present invention is to provide an aluminum foil for visible light reflecting material having higher gloss and a method for producing the same.
  • the inventors of the present invention have found that the glossiness of the aluminum foil is improved by controlling not only the surface roughness but also the crystallized matter present on the surface of the aluminum foil. I found it. That is, the aluminum foil for visible light reflector of the present invention and the manufacturing method thereof have the following characteristics.
  • the ratio of the total surface area of the crystallized substances existing in a predetermined surface area is 2% or less, and the average surface area per one of the above crystallized substances is
  • the surface roughness Rz in the direction perpendicular to the rolling direction is 2 nm or less, and the surface roughness Ra is 10 nm or less.
  • the thickness of the aluminum foil is preferably 4 ⁇ m or more and 200 ⁇ m or less.
  • the aluminum foil is subjected to final finish cold rolling using a rolling roll having a surface roughness Ra of 40 nm or less under a condition of a reduction rate of 35% or more.
  • the aluminum foil for visible light reflecting material of the present invention having the above characteristics has higher gloss than the conventional one, when the aluminum foil for visible light reflecting material of the present invention is applied to the reflecting material, light energy loss is reduced. Light can be transmitted with further reduction.
  • the ratio of the total surface area of the crystallized substances existing in the predetermined surface area of the aluminum foil is 2% or less, the average surface area per crystallized substance is 2 ⁇ m 2 or less,
  • the surface roughness Rz in the direction perpendicular to the rolling direction, that is, the TD direction is 40 nm or less, and the surface roughness Ra is 10 nm or less.
  • the aluminum foil of the present invention has the above-described configuration, so that the glossiness that is an index of regular reflection can exceed 82.2%.
  • the crystallized substance refers to various intermetallic compounds such as Al—Fe, Al—Fe—Mn, Al—Mg—Si, and Al—Mn.
  • the reflectance of the electromagnetic wave incident on the surface of the crystallized substance is lower than the reflectance of the electromagnetic wave incident on the surface of aluminum itself.
  • the surface of the aluminum foil as used in the field of this invention means the area
  • the ratio of the total surface area of the crystallized substance to the surface area of the aluminum foil exceeds 2%, the reflectivity of the aluminum foil is lowered when the crystallized substance is present on the surface of the aluminum foil.
  • the average surface area per crystallized substance is larger than 2 ⁇ m 2 , the reflectance of the surface of the aluminum foil is uneven.
  • the lower limit of the ratio of the total surface area of the crystallized substance existing in the predetermined surface area of the aluminum foil is ideally (theoretical) 0%.
  • the lower limit of the average surface area per crystallized substance it is 0.01%.
  • the detection limit value of the surface area of the crystallized substance is about 0.01 ⁇ m 2
  • the lower limit value of the average surface area per crystallized substance is 0.01 ⁇ m. 2 .
  • the crystallized substance existing on the surface of the aluminum foil not only lowers the original reflectance of the aluminum foil but also causes irregularities on the surface of the aluminum foil.
  • cold rolling which is one of the processes for producing an aluminum foil
  • the crystallized material is harder than the aluminum base, so that aluminum preferentially undergoes plastic deformation.
  • the crystallized material rolls on the surface of the aluminum foil that is plastically deformed, and a part of the crystallized material is missing from the surface of the aluminum foil to cause unevenness on the surface of the aluminum foil. For this reason, when the total surface area of the crystallized substance is large, that is, when the amount of the crystallized substance is large, the degree of occurrence of unevenness on the surface of the aluminum foil increases.
  • the recess formed when the crystallized substance is missing from the surface of the aluminum foil becomes large.
  • the visible light incident on the surface of the aluminum foil is irregularly reflected at the concavo-convex portions formed on the surface of the aluminum foil, so that the reflectance is lowered.
  • the surface roughness Rz in the TD direction perpendicular to the rolling direction is 40 nm or less, and the surface roughness Ra is 10 nm or less, whereby the surface roughness of the aluminum foil is reduced. Therefore, it can be suppressed that the visible light reflected by the uneven portion on the surface of the aluminum foil again hits another uneven portion and the reflected light is attenuated.
  • aluminum foil is manufactured by cold rolling.
  • This cold rolling is applied to the aluminum foil, there are transfer rolls on the surface of the aluminum foil.
  • the transfer streaks of the rolling roll cause unevenness on the surface of the aluminum foil. Concavities and convexities made of transfer streaks of a certain size or more cause anisotropy in the reflection angle of visible light. For this reason, the reflectance decreases particularly at a wavelength close to the ultraviolet region, for example, a wavelength of 380 to 600 nm.
  • the surface roughness resulting from the transfer lines of the rolling roll can be evaluated as a value of the surface roughness Rz in the direction perpendicular to the rolling direction, that is, in the TD direction.
  • the reflectance of light in the visible light region (for example, wavelength of 380 to 600 nm) close to the ultraviolet region is increased, and visible light It can have a high reflectivity over the entire area. Thereby, the average reflectance of the visible light area
  • the surface roughness Ra is controlled to 10 nm or less.
  • polishing processing such as physical polishing, electrolytic polishing, chemical polishing, or cold rolling using a rolling roll whose surface is in a mirror surface state, etc. is there. Cold rolling using a rolling roll whose surface is in a mirror surface will be described later.
  • the thickness of the aluminum foil of the present invention is preferably 4 ⁇ m or more and 200 ⁇ m or less.
  • the thickness of the aluminum foil is less than 4 ⁇ m, the mechanical strength cannot be maintained as the aluminum foil, and the surface of the aluminum foil is wrinkled by handling during production.
  • the thickness of the aluminum foil exceeds 200 ⁇ m, not only the weight of the aluminum foil increases, but also processing such as molding is restricted, which is not preferable.
  • the thickness of the aluminum foil is not less than 6 ⁇ m and not more than 200 ⁇ m. In order to make the thickness of the aluminum foil within the above range, casting and rolling may be performed according to a general aluminum foil manufacturing method.
  • an ingot is produced by preparing a molten aluminum having a predetermined composition and solidifying the molten aluminum.
  • the obtained ingot may be subjected to a homogenization treatment at a temperature of about 400 to 630 ° C. for about 1 to 20 hours. Thereafter, the ingot is hot rolled and cold rolled until it becomes an aluminum foil having a predetermined thickness.
  • the aluminum foil of desired thickness can also be obtained directly by cold rolling after continuous casting.
  • the final finish cold rolling step it is preferable to perform rolling at a rolling reduction of 35% or more using a rolling roll having a surface roughness Ra of 40 nm or less.
  • the reason for using a rolling roll having a surface roughness Ra of 40 nm or less in the final finish cold rolling process is as follows.
  • the surface roughness of the rolling roll used in the final finish cold rolling process greatly affects the surface roughness of the aluminum foil obtained after the final finish cold rolling process.
  • the obtained aluminum foil has a surface roughness Rz in the TD direction perpendicular to the rolling direction of more than 40 nm, and the surface roughness Ra Becomes larger than 10 nm.
  • the surface roughness Ra of the rolling roll used in the final finish cold rolling step is preferably as small as possible, more preferably 30 nm or less.
  • the surface roughness Ra of the rolling roll is the centerline average roughness Ra defined in JIS B0601 (1982 edition), while the surface roughness Ra of the aluminum foil is defined in JIS B0601 (1982 edition). This is a value calculated by extending the centerline average roughness Ra in three dimensions so that it can be applied to the surface.
  • the reason why the rolling reduction in the final finish cold rolling process is 35% or more is as follows. Generally, when the rolling reduction decreases, the amount of rolling oil film that is caught between the rolling roll and the aluminum foil tends to increase. For this reason, the number of oil pits having a depth of several to several tens of ⁇ m that is formed by the rolling oil being pushed into the surface of the aluminum foil after the rolling process is increased. As a result, unevenness due to oil pits increases on the surface of the obtained aluminum foil. Therefore, when rolling is performed at a reduction rate of less than 35%, the surface roughness Ra of the resulting aluminum foil is greatly affected by the unevenness caused by the oil pits and becomes larger than 10 nm.
  • the upper limit of the rolling reduction is not particularly limited, but is preferably 60% in consideration of rolling properties.
  • the aluminum foil When producing a soft aluminum foil, the aluminum foil may be heat-treated at a temperature of about 250 to 450 ° C. for about 1 to 30 hours.
  • the surface of the obtained aluminum foil for visible light reflecting material may be further polished so as to improve the glossiness.
  • a surface protective layer may be provided on the surface of the aluminum foil for the purpose of protecting the surface.
  • the surface protective layer is formed by laminating a film on the surface of an aluminum foil, coating a resin, etc., for example, forming an SiO-based inorganic layer by ion plasma treatment, performing ion plating treatment, sputtering It may be provided on the surface of the aluminum foil by performing a treatment, performing a vapor deposition treatment, performing a plating treatment, or forming an oxide film layer by anodic oxidation.
  • the obtained aluminum foil for visible light reflecting material may be formed into an arbitrary shape and used. Specifically, it may be processed into an arbitrary shape by an overhang forming process or a deep drawing process, or may be processed into a shape according to the purpose by a bending process or a bending process.
  • One surface of the obtained aluminum foil for visible light reflecting material may be used as a reflecting material, and the other surface may be attached to other parts and used, or bonded to a metal or resin plate or film. May be used. Furthermore, for example, after bonding the surface of an aluminum foil to a resin film, a resist layer may be selectively provided on the surface, and an etching process may be performed to form a wiring pattern for use.
  • the composition of the aluminum foil of the present invention is not particularly limited, but the iron (Fe) content is preferably 0.001% by mass to 0.5% by mass. Since iron has a low solid solubility in aluminum, intermetallic compounds such as FeAl 3 are easily crystallized during the casting of aluminum. These crystallized substances have a lower reflectance in the visible light region than the aluminum base, and cause a decrease in the visible light reflectance as the aluminum foil.
  • the iron content is 0.5% by mass or more, when all of the added iron is crystallized, the crystallization amount of FeAl 3 as the Al—Fe intermetallic compound exceeds 1.2% by mass. Will be present and the gloss will be lower than 82.2%. For this reason, it is necessary to make iron content into 0.5 mass% or less. Moreover, the intensity
  • the content of manganese (Mn) is preferably 0.5% by mass or less.
  • manganese has a low solid solubility in aluminum, so that Al—Fe—Mn compounds and the like are easily crystallized during the casting of aluminum.
  • the Al-Fe-Mn crystallized material is finer than the Al-Fe based crystallized material, but these crystallized materials have a lower reflectance in the visible light region than the aluminum base, and are used as an aluminum foil. This causes a decrease in the visible light reflectance.
  • the manganese content is 0.5 mass% or more, when all of the added manganese is crystallized, the Al-Fe-Mn intermetallic compound is present in an amount exceeding 1.5 mass%, The gloss level is lower than 82.2%. For this reason, it is necessary to make manganese content into 0.5 mass% or less.
  • the content of silicon (Si) is preferably 0.001% by mass or more and 0.3% by mass or less. Since silicon has a high solid solubility in aluminum and hardly forms a crystallized substance, the reflectivity in the visible light region is not lowered if the content is such that no crystallized substance is generated in the aluminum foil.
  • the mechanical strength of the aluminum foil can be improved by solid solution strengthening, so that the thin foil can be easily rolled. If the silicon content is less than 0.001% by mass, the above-described effects cannot be obtained sufficiently. If the silicon content exceeds 0.3% by mass, coarse crystals are likely to be generated, and not only the reflection characteristics are deteriorated, but also the effect of refining crystal grains is impaired, so that the strength and workability are also improved. It tends to decrease.
  • the content of magnesium (Mg) is preferably 3% by mass or less.
  • Magnesium has a maximum solid solubility in aluminum of 18% by mass and the occurrence of crystallized substances is extremely small, so the mechanical strength of the aluminum foil should be improved without greatly affecting the reflective properties of the aluminum foil. Can do.
  • the magnesium content exceeds 3% by mass, the mechanical strength of the aluminum foil becomes too high, so that the rollability of the aluminum foil is lowered.
  • the magnesium content is more preferably 2% by mass or less.
  • the aluminum foil of the present invention has a content that does not affect the above characteristics and effects, and includes copper (Cu), zinc (Zn), titanium (Ti), vanadium (V), nickel (Ni), Elements such as chromium (Cr), zirconium (Zr), boron (B), gallium (Ga), and bismuth (Bi) may be included.
  • the aluminum foil of the present invention is literally a “foil” and has the following various merits, unlike an “aluminum plate” having a thickness of about 500 ⁇ m or more. That is, the aluminum foil has advantages in that it is particularly excellent in weight reduction and is easy to mold, and exhibits shape followability and flexibility such as sticking to a curved object, which is difficult with an aluminum plate. Moreover, it has the merit with respect to an aluminum plate also in terms of the load with respect to an environment, such as leading to the reduction of waste.
  • such an aluminum foil of the present invention makes use of the above-mentioned merits, reflecting a reflector for lighting equipment, a reflector for lighting such as a house, a strobe reflector, and a solar cooker (reflector for cooking utensils by collecting sunlight). It can be suitably used for applications such as packaging materials and decorative materials.
  • samples of aluminum foils of Examples and Comparative Examples of the present invention were prepared.
  • samples of aluminum foils of Examples 1 to 5 and Comparative Examples 1 to 9 shown in Table 3 were prepared according to the manufacturing process shown in Table 2.
  • other element meter indicates the total content of inevitable impurity elements (B, Bi, Pb, Na, etc.) other than the elements specified by JIS.
  • an ingot of aluminum obtained by DC casting was subjected to homogenization heat treatment at a predetermined temperature and time in a heating furnace. Thereafter, hot rolling was performed until the thickness became about 6.5 mm. Using the obtained hot rolled material, cold rolling is performed a plurality of times, intermediate annealing is performed at a predetermined temperature and time during the cold rolling, and cold rolling is performed until the thickness reaches a predetermined value. Samples of aluminum foil having thicknesses shown in Table 3 were prepared. At this time, in Examples 1 to 5 and Comparative Examples 1 to 4 and 9, rolling was performed at a rolling reduction of 35% using a rolling roll having a surface roughness Ra of 40 nm in the final finish cold rolling.
  • the homogenization heat treatment time may be within a general treatment time, and is not limited to the time shown in Table 2.
  • the intermediate annealing conditions are not limited to the temperatures and times shown in Table 2, and may be within the range of general operating conditions.
  • the surface state was observed with an optical microscope, and the surface area of the crystallized material and the average surface area per one were measured. Moreover, in order to evaluate surface unevenness
  • these measurement methods will be described.
  • Observation of surface irregularities with an atomic force microscope was performed using a scanning probe microscope Nanopics 1000 manufactured by Seiko Instruments Inc., and a surface shape by a damping method (non-contact) with a rectangular field of view of 80 ⁇ m ⁇ 80 ⁇ m.
  • the obtained observation result is corrected by a cubic curved surface automatic inclination correction that performs fitting by obtaining a curved surface by least square approximation, and a surface roughness Ra and a width (TD) perpendicular to the rolling direction.
  • the surface roughness Rz in the direction was measured.
  • the surface roughness Ra is a value calculated by extending the centerline average roughness Ra defined in JIS B0601 (1982 edition) in three dimensions so that it can be applied to the entire observed surface.
  • the surface roughness Rz in the width (TD) direction was measured by an evaluation method based on JIS B0601 (1982 version) for a two-dimensional Rz value in a cross section in an arbitrary width (TD) direction within the same visual field.
  • Table 3 shows the values of the surface roughness Ra and Rz.
  • Glossiness was measured using a gloss meter VG7000 manufactured by Nippon Denshoku Industries Co., Ltd., with a light incident angle of 60 °. The glossiness was measured in two directions, a rolling direction (MD) and a direction perpendicular to the rolling direction (TD), and the glossiness was evaluated as an average value of these. Table 3 shows the measured values and average values of these gloss levels.
  • the ratio of the total surface area of the crystallized substances existing on the surface of the aluminum foil is 2% or less, the average surface area per crystallized substance is 2 ⁇ m 2 or less, and in the TD direction.
  • the aluminum foils of Examples 1 to 5 having a surface roughness Rz of 40 nm or less and a surface roughness Ra of 10 nm or less show high reflection characteristics, and the glossiness is higher than 82.2%.
  • the total surface area of the crystallized substances present on the surface of the aluminum foil, the average surface area per crystallized substance, the surface roughness Rz in the TD direction, and the surface When at least one of the roughness Ra is out of the above range, the glossiness becomes a value smaller than 82.2%, which is equal to or less than that of the existing aluminum foil.
  • Example 4 and Comparative Example 9 the same composition F was used, and the total surface area and average surface area of the crystallized materials differed even though they were the same manufacturing process. This is because the amount of the crystallized substance is changed by changing the cooling rate of the DC casting described above.
  • the aluminum foil for visible light reflecting material of the present invention has a higher gloss than before, when the aluminum foil for visible light reflecting material of the present invention is applied to a reflecting material, light energy loss is further reduced and light is reduced. Can be transmitted.

Abstract

　In the present invention, crystallized substances present in a predetermined surface area of an aluminum foil represent 2% or less of the total surface area. The average surface area per crystallized substance is 2 μm2 or less. The surface roughness (Rz) in the direction perpendicular to the rolling direction is 40 nm or less. The surface roughness (Ra) is 10 nm or less. An aluminum foil for a visible-light-reflecting material is produced by using a roll having a surface roughness (Ra) of 40 nm or less to carry out end-finish cold rolling of the aluminum foil at a rolling reduction of 35% or more.

Description

可視光反射材用アルミニウム箔とその製造方法Aluminum foil for visible light reflecting material and manufacturing method thereof
　本発明は、可視光反射材用アルミニウム箔とその製造方法に関する。なお、本明細書においては、「アルミニウム箔」という用語は、純アルミニウム箔だけでなく、アルミニウム合金箔も含む意味で用いられる。 The present invention relates to an aluminum foil for a visible light reflecting material and a method for producing the same. In the present specification, the term “aluminum foil” is used to include not only pure aluminum foil but also aluminum alloy foil.
　近年、環境への影響を低減する観点から、太陽光、照明光等の光を効率的に利用することが望まれている。光の効率的な利用として、たとえば、太陽光を所定の箇所に集めて発電する方法または発熱させる方法が挙げられる。光を効率よく利用するためには、光を最小限のエネルギー損失で反射させる必要がある。このためには、使用される反射材は、最小限のロスで光という電磁波を反射させると同時に、反射した電磁波を所定の箇所に無駄なく伝えて集めるためには、電磁波をできるだけ散乱させずに反射させることが望まれる。すなわち、反射材に要求される重要な性能としては、反射材に入射する角度と同じ角度で電磁波を反射させるという正反射が最小限のエネルギー損失で行われることである。 In recent years, it has been desired to efficiently use light such as sunlight and illumination light from the viewpoint of reducing the influence on the environment. As an efficient use of light, for example, there is a method of collecting sunlight at a predetermined location to generate power or a method of generating heat. In order to use light efficiently, it is necessary to reflect light with minimum energy loss. For this purpose, the reflective material used reflects the electromagnetic wave called light with minimal loss, and at the same time, in order to transmit and collect the reflected electromagnetic wave without waste to a predetermined location, the electromagnetic wave is not scattered as much as possible. It is desired to reflect. That is, an important performance required for the reflecting material is that regular reflection of reflecting an electromagnetic wave at the same angle as the incident angle to the reflecting material is performed with a minimum energy loss.
　正反射の度合いは、光沢度（JIS　Z　8740）によって規定される数値によって評価される。光沢度は、一方向から特定の角度θで、たとえば６０度の角度で入射した光を特定の角度θで、たとえば６０度で反射した光を受光し、その受光量によって評価される。 The degree of regular reflection is evaluated by the numerical value defined by the glossiness (JIS Z 8740). The glossiness is evaluated based on the amount of light received from one direction by receiving light incident at a specific angle θ, for example, 60 °, and receiving light reflected at a specific angle θ, for example, 60 °.
　正反射の度合いが高く、かつ、可視光領域での反射率が高い反射材として、銀、アルミニウムが挙げられる。特に、アルミニウムは、密度が小さく軽量で、熱伝導性もよく、金属の中でも比較的安価でかつ反射率が高い材料として、可視光反射材の用途として注目されている。 Examples of the reflective material having a high degree of regular reflection and a high reflectance in the visible light region include silver and aluminum. In particular, aluminum is attracting attention as an application of a visible light reflecting material as a material having a small density, light weight, good thermal conductivity, and relatively inexpensive among metals and having a high reflectance.
　特開２００３－１７０２０５号公報（以下、特許文献１という）に記載されているように、アルミニウム箔の反射特性として光沢度は一般的に６０～７０％程度である。 As described in Japanese Patent Application Laid-Open No. 2003-170205 (hereinafter referred to as Patent Document 1), the glossiness is generally about 60 to 70% as the reflection characteristic of the aluminum foil.
　一方、特開２００２－１４３９０４号公報（以下、特許文献２という）には、高光沢アルミニウム板を製造する方法として、フィルム研磨あるいはキスロール研磨により表面仕上げされた圧延ロールにより、アルミニウム板を最終仕上げ冷間圧延することが記載されている。この方法を用いて、磨き上げたロールの低い表面粗さをアルミニウム板の表面に転写することによって、表面粗さＲａが０．２０～０．６０μｍ程度のアルミニウム板を得ている。 On the other hand, in Japanese Patent Laid-Open No. 2002-143904 (hereinafter referred to as Patent Document 2), as a method for producing a high-gloss aluminum plate, the aluminum plate is subjected to final finish cooling by a rolling roll surface-finished by film polishing or kiss roll polishing. It is described that it is rolled. Using this method, an aluminum plate having a surface roughness Ra of about 0.20 to 0.60 μm is obtained by transferring the low surface roughness of the polished roll onto the surface of the aluminum plate.
特開２００３－１７０２０５号公報JP 2003-170205 A 特開２００２－１４３９０４号公報JP 2002-143904 A
　特許文献１に記載されているように、アルミニウム箔の反射特性として光沢度は一般的に６０～７０％程度である。 As described in Patent Document 1, glossiness is generally about 60 to 70% as a reflection characteristic of an aluminum foil.
　特許文献２で得られた表面粗さＲａが０．２０～０．６０μｍ程度のアルミニウム板では、アルミニウム板の表面の凹凸が大きく、入射光は表面の凹凸部で乱反射し、正反射する光が減少するという問題がある。 In the aluminum plate having a surface roughness Ra of about 0.20 to 0.60 μm obtained in Patent Document 2, the unevenness of the surface of the aluminum plate is large, and incident light is irregularly reflected by the uneven portion of the surface, and light that is specularly reflected is reflected. There is a problem of decreasing.
　また、表面粗さＲａが４０ｎｍ以下の低粗度に磨き上げた圧延ロールでアルミニウム箔を最終仕上げ冷間圧延するという方法を用いても、発明者によれば、光沢度が最大でも８２．２％のアルミニウム箔しか得ることができない。この程度の光沢度のアルミニウム箔では、より高い反射率を有する反射材の用途に応えることができない。 Further, even when using a method in which the aluminum foil is finally finished and cold-rolled with a rolling roll polished to a low roughness with a surface roughness Ra of 40 nm or less, according to the inventors, the glossiness is 82.2 at the maximum. % Aluminum foil can be obtained. An aluminum foil having such a gloss level cannot meet the application of a reflector having a higher reflectance.
　そこで、本発明の目的は、より高い光沢度を有する可視光反射材用アルミニウム箔とその製造方法を提供することである。 Therefore, an object of the present invention is to provide an aluminum foil for visible light reflecting material having higher gloss and a method for producing the same.
　本発明者らは上記の課題を解決するために鋭意検討を重ねた結果、表面粗さだけでなく、アルミニウム箔表面に存在する晶出物を制御すると、アルミニウム箔の光沢度が向上することを見出した。すなわち、本発明の可視光反射材用アルミニウム箔とその製造方法は、以下の特徴を有する。 As a result of intensive studies to solve the above-mentioned problems, the inventors of the present invention have found that the glossiness of the aluminum foil is improved by controlling not only the surface roughness but also the crystallized matter present on the surface of the aluminum foil. I found it. That is, the aluminum foil for visible light reflector of the present invention and the manufacturing method thereof have the following characteristics.
　本発明に従った可視光反射材用アルミニウム箔は、予め定められた表面積に存在する晶出物の総表面積の割合が２％以下であり、上記の晶出物の１個当たりの平均表面積が２μｍ２以下であり、圧延方向に対して垂直な方向の表面粗さＲｚが４０ｎｍ以下であり、かつ、表面粗さＲａが１０ｎｍ以下である。 In the aluminum foil for visible light reflecting material according to the present invention, the ratio of the total surface area of the crystallized substances existing in a predetermined surface area is 2% or less, and the average surface area per one of the above crystallized substances is The surface roughness Rz in the direction perpendicular to the rolling direction is 2 nm or less, and the surface roughness Ra is 10 nm or less.
　本発明の可視光反射材用アルミニウム箔において、当該アルミニウム箔の厚みは４μｍ以上２００μｍ以下であることが好ましい。 In the aluminum foil for visible light reflecting material of the present invention, the thickness of the aluminum foil is preferably 4 μm or more and 200 μm or less.
　上述の特徴を有する可視光反射材用アルミニウム箔を製造する方法では、表面粗さＲａが４０ｎｍ以下である圧延ロールを用いて圧下率が３５％以上の条件でアルミニウム箔を最終仕上げ冷間圧延する。 In the method for producing an aluminum foil for a visible light reflecting material having the above-described characteristics, the aluminum foil is subjected to final finish cold rolling using a rolling roll having a surface roughness Ra of 40 nm or less under a condition of a reduction rate of 35% or more. .
　以上の特徴を有する本発明の可視光反射材用アルミニウム箔は、従来よりも高い光沢度を有するので、本発明の可視光反射材用アルミニウム箔を反射材に適用した場合に光のエネルギー損失をより低減させて光を伝送することができる。 Since the aluminum foil for visible light reflecting material of the present invention having the above characteristics has higher gloss than the conventional one, when the aluminum foil for visible light reflecting material of the present invention is applied to the reflecting material, light energy loss is reduced. Light can be transmitted with further reduction.
　以下、本発明の実施の形態を説明する。
　本発明のアルミニウム箔は、アルミニウム箔の予め定められた表面積に存在する晶出物の総表面積の割合が２％以下であり、晶出物の１個当たりの平均表面積が２μｍ２以下であり、圧延方向に対して垂直な方向、すなわち、ＴＤ方向の表面粗さＲｚが４０ｎｍ以下であり、表面粗さＲａが１０ｎｍ以下である。 Embodiments of the present invention will be described below.
In the aluminum foil of the present invention, the ratio of the total surface area of the crystallized substances existing in the predetermined surface area of the aluminum foil is 2% or less, the average surface area per crystallized substance is 2 μm 2 or less, The surface roughness Rz in the direction perpendicular to the rolling direction, that is, the TD direction is 40 nm or less, and the surface roughness Ra is 10 nm or less.
　本発明のアルミニウム箔が上記の構成を有することによって、正反射の指標となる光沢度が８２．２％を超えることができる。なお、晶出物とは、たとえば、Ａｌ‐Ｆｅ系、Ａｌ‐Ｆｅ‐Ｍｎ系、Ａｌ‐Ｍｇ‐Ｓｉ系、Ａｌ‐Ｍｎ系等の種々の金属間化合物をいう。晶出物の表面に入射した電磁波の反射率は、アルミニウム自体の表面に入射した電磁波の反射率よりも低い。なお、本発明でいうアルミニウム箔の表面とは、アルミニウム箔の外観において目視、顕微鏡等によって確認され得る領域をいう。厳密には、アルミニウム箔とアルミニウム箔の表面に存在する晶出物との表面には酸化被膜が形成されているが、本発明でいうアルミニウム箔の表面とは、これらの酸化被膜を除いたアルミニウム箔の表面をいう。 The aluminum foil of the present invention has the above-described configuration, so that the glossiness that is an index of regular reflection can exceed 82.2%. Note that the crystallized substance refers to various intermetallic compounds such as Al—Fe, Al—Fe—Mn, Al—Mg—Si, and Al—Mn. The reflectance of the electromagnetic wave incident on the surface of the crystallized substance is lower than the reflectance of the electromagnetic wave incident on the surface of aluminum itself. In addition, the surface of the aluminum foil as used in the field of this invention means the area | region which can be confirmed by visual observation, a microscope, etc. in the external appearance of aluminum foil. Strictly speaking, an oxide film is formed on the surface of the aluminum foil and the crystallized material existing on the surface of the aluminum foil, but the surface of the aluminum foil in the present invention refers to aluminum excluding these oxide films. The surface of the foil.
　アルミニウム箔の表面積に対する晶出物の総表面積の割合が２％を超えるほど晶出物がアルミニウム箔の表面に存在していると、アルミニウム箔の反射率は低下してしまう。晶出物の１個当たりの平均表面積が２μｍ２よりも大きいと、アルミニウム箔の表面の反射率にムラが生じてしまう。 When the ratio of the total surface area of the crystallized substance to the surface area of the aluminum foil exceeds 2%, the reflectivity of the aluminum foil is lowered when the crystallized substance is present on the surface of the aluminum foil. When the average surface area per crystallized substance is larger than 2 μm 2 , the reflectance of the surface of the aluminum foil is uneven.
　なお、アルミニウム箔の予め定められた表面積に存在する晶出物の総表面積の割合の下限値は理想的（理論的）には０％である。しかし、後述する晶出物の１個当たりの平均表面積の下限値を考慮すると０．０１％である。また、晶出物は光学顕微鏡で観察されるので、晶出物の表面積の検出限界値は０．０１μｍ２程度であるので、晶出物の１個当たりの平均表面積の下限値は０．０１μｍ２である。 In addition, the lower limit of the ratio of the total surface area of the crystallized substance existing in the predetermined surface area of the aluminum foil is ideally (theoretical) 0%. However, when considering the lower limit of the average surface area per crystallized substance to be described later, it is 0.01%. Further, since the crystallized substance is observed with an optical microscope, the detection limit value of the surface area of the crystallized substance is about 0.01 μm 2 , so the lower limit value of the average surface area per crystallized substance is 0.01 μm. 2 .
　また、アルミニウム箔の表面に存在する晶出物は、アルミニウム箔本来の反射率を低下させるだけでなく、アルミニウム箔の表面に凹凸を生じさせる。アルミニウム箔を製造するプロセスの１つである冷間圧延において、晶出物はアルミニウムの素地よりも硬いため、アルミニウムが優先的に塑性変形を起こす。晶出物は、塑性変形しているアルミニウム箔の表面の上を転がり、一部の晶出物はアルミニウム箔の表面から欠落してアルミニウム箔の表面に凹凸を生じさせる。このため、晶出物の総表面積が大きいと、すなわち晶出物の量が多いと、アルミニウム箔の表面に凹凸を生じさせる度合いが大きくなる。さらに、晶出物の１個当たりの平均表面積が大きいと、晶出物がアルミニウム箔の表面から欠落したときに形成される凹部は大きくなる。これらの結果、アルミニウム箔の表面に入射した可視光が、アルミニウム箔の表面に形成された凹凸部において乱反射するので、反射率が低下する。 Moreover, the crystallized substance existing on the surface of the aluminum foil not only lowers the original reflectance of the aluminum foil but also causes irregularities on the surface of the aluminum foil. In cold rolling, which is one of the processes for producing an aluminum foil, the crystallized material is harder than the aluminum base, so that aluminum preferentially undergoes plastic deformation. The crystallized material rolls on the surface of the aluminum foil that is plastically deformed, and a part of the crystallized material is missing from the surface of the aluminum foil to cause unevenness on the surface of the aluminum foil. For this reason, when the total surface area of the crystallized substance is large, that is, when the amount of the crystallized substance is large, the degree of occurrence of unevenness on the surface of the aluminum foil increases. Furthermore, when the average surface area per crystallized substance is large, the recess formed when the crystallized substance is missing from the surface of the aluminum foil becomes large. As a result, the visible light incident on the surface of the aluminum foil is irregularly reflected at the concavo-convex portions formed on the surface of the aluminum foil, so that the reflectance is lowered.
　さらに、本発明のアルミニウム箔において、圧延方向に対して垂直なＴＤ方向の表面粗さＲｚが４０ｎｍ以下であり、表面粗さＲａが１０ｎｍ以下であることによって、アルミニウム箔の表面の凹凸が低減するので、アルミニウム箔の表面の凹凸部で反射した可視光が別の凹凸部に再び当たって反射光が減衰することを抑えることができる。 Furthermore, in the aluminum foil of the present invention, the surface roughness Rz in the TD direction perpendicular to the rolling direction is 40 nm or less, and the surface roughness Ra is 10 nm or less, whereby the surface roughness of the aluminum foil is reduced. Therefore, it can be suppressed that the visible light reflected by the uneven portion on the surface of the aluminum foil again hits another uneven portion and the reflected light is attenuated.
　一般的にアルミニウム箔は冷間圧延によって製造される。この冷間圧延がアルミニウム箔に施されると、アルミニウム箔の表面に圧延ロールの転写筋が存在する。この圧延ロールの転写筋がアルミニウム箔の表面に凹凸を生じさせることになる。一定以上の大きさの転写筋からなる凹凸は、可視光の反射角度に異方性をもたらす。このため、特に紫外線域に近い波長、たとえば、３８０～６００ｎｍの波長において反射率が低下する。この圧延ロールの転写筋に起因する表面粗さは、圧延方向に対して垂直な方向、すなわちＴＤ方向の表面粗さＲｚの値として評価することができる。 Generally, aluminum foil is manufactured by cold rolling. When this cold rolling is applied to the aluminum foil, there are transfer rolls on the surface of the aluminum foil. The transfer streaks of the rolling roll cause unevenness on the surface of the aluminum foil. Concavities and convexities made of transfer streaks of a certain size or more cause anisotropy in the reflection angle of visible light. For this reason, the reflectance decreases particularly at a wavelength close to the ultraviolet region, for example, a wavelength of 380 to 600 nm. The surface roughness resulting from the transfer lines of the rolling roll can be evaluated as a value of the surface roughness Rz in the direction perpendicular to the rolling direction, that is, in the TD direction.
　本発明のアルミニウム箔では、ＴＤ方向の表面粗さＲｚを４０ｎｍ以下に制御することにより、紫外線域に近い可視光域（たとえば、３８０～６００ｎｍの波長）の光の反射率が高くなり、可視光全域で高い反射率を有することができる。これにより、アルミニウム箔の表面に対する可視光領域の平均反射率を向上させることができる。 In the aluminum foil of the present invention, by controlling the surface roughness Rz in the TD direction to 40 nm or less, the reflectance of light in the visible light region (for example, wavelength of 380 to 600 nm) close to the ultraviolet region is increased, and visible light It can have a high reflectivity over the entire area. Thereby, the average reflectance of the visible light area | region with respect to the surface of aluminum foil can be improved.
　ところで、自然法則に基づくと、入射した可視光の電磁波がある表面で反射する際、その表面に凹凸があれば、入射した箇所によって反射する角度は変化する。場合によってはある凹凸部で反射した光は、たとえば、その凹凸部の隣に存在する凹凸部にさらに当たり（入射し）、複数回反射を起こす可能性が生まれる。１回の反射において反射光は減衰することは知られているが、複数回反射すると、その光はその分だけ反射率が低下する。そこで、本発明のアルミニウム箔では、表面粗さＲａが１０ｎｍ以下に制御されている。 By the way, based on the law of nature, when the incident visible light electromagnetic wave is reflected by a surface, if the surface has irregularities, the angle of reflection varies depending on the incident portion. In some cases, the light reflected by a certain uneven portion, for example, further strikes (enters) the uneven portion existing next to the uneven portion, and there is a possibility that the light is reflected a plurality of times. Although it is known that the reflected light attenuates in one reflection, when the light is reflected a plurality of times, the reflectance of the light is reduced accordingly. Therefore, in the aluminum foil of the present invention, the surface roughness Ra is controlled to 10 nm or less.
　なお、上記の表面粗さＲｚとＲａを得る方法としては、物理的な研磨、電解研磨、化学研磨等の研磨加工、あるいは、表面が鏡面状態である圧延ロールを用いた冷間圧延、等がある。表面が鏡面状態である圧延ロールを用いた冷間圧延については後述する。 In addition, as methods for obtaining the above surface roughness Rz and Ra, polishing processing such as physical polishing, electrolytic polishing, chemical polishing, or cold rolling using a rolling roll whose surface is in a mirror surface state, etc. is there. Cold rolling using a rolling roll whose surface is in a mirror surface will be described later.
　本発明のアルミニウム箔の厚みは４μｍ以上２００μｍ以下であることが好ましい。アルミニウム箔の厚みが４μｍ未満であると、アルミニウム箔として機械的強度を維持することができず、製造時のハンドリング等によってアルミニウム箔の表面にしわが生じる。アルミニウム箔の厚みが２００μｍを超えると、アルミニウム箔の重量が増大するだけでなく、成形等の加工に制限が加えられるので好ましくない。さらに好ましくは、アルミニウム箔の厚みは６μｍ以上２００μｍ以下である。アルミニウム箔の厚みを上記範囲にするためには、一般的なアルミニウム箔の製造方法に従って鋳造と圧延を行えばよい。 The thickness of the aluminum foil of the present invention is preferably 4 μm or more and 200 μm or less. When the thickness of the aluminum foil is less than 4 μm, the mechanical strength cannot be maintained as the aluminum foil, and the surface of the aluminum foil is wrinkled by handling during production. When the thickness of the aluminum foil exceeds 200 μm, not only the weight of the aluminum foil increases, but also processing such as molding is restricted, which is not preferable. More preferably, the thickness of the aluminum foil is not less than 6 μm and not more than 200 μm. In order to make the thickness of the aluminum foil within the above range, casting and rolling may be performed according to a general aluminum foil manufacturing method.
　圧延方向に対して垂直なＴＤ方向の表面粗さＲｚを４０ｎｍ以下、表面粗さＲａを１０ｎｍ以下にする方法の１つとして、以下の製造方法を採用することが望ましい。 It is desirable to employ the following manufacturing method as one of methods for setting the surface roughness Rz in the TD direction perpendicular to the rolling direction to 40 nm or less and the surface roughness Ra to 10 nm or less.
　具体的には、所定の組成のアルミニウムの溶湯を調製し、アルミニウムの溶湯を凝固させることにより鋳塊を製造する。得られた鋳塊に４００～６３０℃程度の温度で１～２０時間程度の均質化処理を施してもよい。その後、鋳塊に熱間圧延と冷間圧延を施すことによって所定の厚みのアルミニウム箔になるまで圧延する。なお、連続鋳造によって薄板のアルミニウムを製造する場合には、連続鋳造後、直接、冷間圧延によって所望の厚みのアルミニウム箔を得ることもできる。 Specifically, an ingot is produced by preparing a molten aluminum having a predetermined composition and solidifying the molten aluminum. The obtained ingot may be subjected to a homogenization treatment at a temperature of about 400 to 630 ° C. for about 1 to 20 hours. Thereafter, the ingot is hot rolled and cold rolled until it becomes an aluminum foil having a predetermined thickness. In addition, when manufacturing aluminum of a thin plate by continuous casting, the aluminum foil of desired thickness can also be obtained directly by cold rolling after continuous casting.
　その後、最終仕上げ冷間圧延工程において、表面粗さＲａが４０ｎｍ以下である圧延ロールを用いて、３５％以上の圧下率で圧延することが好ましい。 Then, in the final finish cold rolling step, it is preferable to perform rolling at a rolling reduction of 35% or more using a rolling roll having a surface roughness Ra of 40 nm or less.
　最終仕上げ冷間圧延工程において表面粗さＲａが４０ｎｍ以下である圧延ロールを用いる理由は以下のとおりである。最終仕上げ冷間圧延工程で使用する圧延ロールの表面粗さは、最終仕上げ冷間圧延工程後に得られるアルミニウム箔の表面粗さに大きく影響する。表面粗さＲａが４０ｎｍより大きい圧延ロールを用いてアルミニウム箔を圧延すると、得られたアルミニウム箔は圧延方向に対して垂直なＴＤ方向の表面粗さＲｚが４０ｎｍよりも大きくなり、表面粗さＲａも１０ｎｍよりも大きくなってしまう。最終仕上げ冷間圧延工程で使用する圧延ロールの表面粗さＲａは、できるだけ小さいことが好ましく、より好ましくは３０ｎｍ以下である。なお、圧延ロールの表面粗さＲａはＪＩＳ　Ｂ０６０１（１９８２年版）で定義されている中心線平均粗さＲａであり、一方、アルミニウム箔の表面粗さＲａはＪＩＳ　Ｂ０６０１（１９８２年版）で定義されている中心線平均粗さＲａを、面に対して適用できるように三次元に拡張して算出された値である。 The reason for using a rolling roll having a surface roughness Ra of 40 nm or less in the final finish cold rolling process is as follows. The surface roughness of the rolling roll used in the final finish cold rolling process greatly affects the surface roughness of the aluminum foil obtained after the final finish cold rolling process. When an aluminum foil is rolled using a rolling roll having a surface roughness Ra of more than 40 nm, the obtained aluminum foil has a surface roughness Rz in the TD direction perpendicular to the rolling direction of more than 40 nm, and the surface roughness Ra Becomes larger than 10 nm. The surface roughness Ra of the rolling roll used in the final finish cold rolling step is preferably as small as possible, more preferably 30 nm or less. The surface roughness Ra of the rolling roll is the centerline average roughness Ra defined in JIS B0601 (1982 edition), while the surface roughness Ra of the aluminum foil is defined in JIS B0601 (1982 edition). This is a value calculated by extending the centerline average roughness Ra in three dimensions so that it can be applied to the surface.
　最終仕上げ冷間圧延工程における圧下率が３５％以上である理由は以下のとおりである。一般的に圧下率が低くなると、圧延ロールとアルミニウム箔との間にかみこまれる圧延油膜量が増える傾向にある。このため、圧延工程後のアルミニウム箔の表面に圧延油が押し込まれてできる深さが数～数十μｍのオイルピットが増える。その結果、得られたアルミニウム箔の表面は、オイルピットによる凹凸が増えてしまう。したがって、３５％よりも小さい圧下率で圧延を行うと、得られるアルミニウム箔の表面粗さＲａは、オイルピットによる凹凸に大きく影響され、１０ｎｍよりも大きくなってしまう。圧下率の上限値は、特に限定されないが、圧延性を考慮すると、好ましくは６０％である。 The reason why the rolling reduction in the final finish cold rolling process is 35% or more is as follows. Generally, when the rolling reduction decreases, the amount of rolling oil film that is caught between the rolling roll and the aluminum foil tends to increase. For this reason, the number of oil pits having a depth of several to several tens of μm that is formed by the rolling oil being pushed into the surface of the aluminum foil after the rolling process is increased. As a result, unevenness due to oil pits increases on the surface of the obtained aluminum foil. Therefore, when rolling is performed at a reduction rate of less than 35%, the surface roughness Ra of the resulting aluminum foil is greatly affected by the unevenness caused by the oil pits and becomes larger than 10 nm. The upper limit of the rolling reduction is not particularly limited, but is preferably 60% in consideration of rolling properties.
　なお、軟質のアルミニウム箔を製造する場合には、アルミニウム箔に２５０～４５０℃程度の温度で１～３０時間程度の熱処理を施せばよい。 When producing a soft aluminum foil, the aluminum foil may be heat-treated at a temperature of about 250 to 450 ° C. for about 1 to 30 hours.
　得られた可視光反射材用アルミニウム箔の表面をさらに研磨することによって光沢度を向上させる処理を行ってもよい。表面を保護する目的で表面保護層をアルミニウム箔の表面に設けてもよい。表面保護層は、アルミニウム箔の表面にフィルムを貼り合わせて積層すること、樹脂等をコーティングすること、たとえばＳｉＯ系の無機物層をイオンプラズマ処理によって形成すること、イオンプレーティング処理を施すこと、スパッタリング処理を施すこと、蒸着処理を施すこと、めっき処理を施すこと、陽極酸化によって酸化被膜層を形成すること、等によってアルミニウム箔の表面に設けられてもよい。 The surface of the obtained aluminum foil for visible light reflecting material may be further polished so as to improve the glossiness. A surface protective layer may be provided on the surface of the aluminum foil for the purpose of protecting the surface. The surface protective layer is formed by laminating a film on the surface of an aluminum foil, coating a resin, etc., for example, forming an SiO-based inorganic layer by ion plasma treatment, performing ion plating treatment, sputtering It may be provided on the surface of the aluminum foil by performing a treatment, performing a vapor deposition treatment, performing a plating treatment, or forming an oxide film layer by anodic oxidation.
　得られた可視光反射材用アルミニウム箔を任意の形状に成形して使用してもよい。具体的には、張り出し成形加工または深絞り成形加工によって任意の形状に加工してもよく、あるいは、折り曲げ加工または湾曲加工によって目的に応じた形状に加工してもよい。 The obtained aluminum foil for visible light reflecting material may be formed into an arbitrary shape and used. Specifically, it may be processed into an arbitrary shape by an overhang forming process or a deep drawing process, or may be processed into a shape according to the purpose by a bending process or a bending process.
　得られた可視光反射材用アルミニウム箔の一方の表面を反射材として使用し、もう一方の表面を他の部品に貼り付けて使用してもよく、金属、樹脂等の板またはフィルムに貼り合わせて使用してもよい。さらに、たとえば、アルミニウム箔の表面を樹脂フィルムに貼り合わせた後、その表面にレジスト層を選択的に設け、エッチング処理を施すことによって配線パターンを形成して使用してもよい。 One surface of the obtained aluminum foil for visible light reflecting material may be used as a reflecting material, and the other surface may be attached to other parts and used, or bonded to a metal or resin plate or film. May be used. Furthermore, for example, after bonding the surface of an aluminum foil to a resin film, a resist layer may be selectively provided on the surface, and an etching process may be performed to form a wiring pattern for use.
　本発明のアルミニウム箔の組成は特に限定されないが、鉄（Ｆｅ）の含有量は０．００１％質量以上０．５質量％以下であることが好ましい。鉄はアルミニウムへの固溶度が小さいため、アルミニウムの鋳造時にＦｅＡｌ３等の金属間化合物が晶出しやすくなる。これらの晶出物は、アルミニウム素地よりも可視光領域の反射率が低く、アルミニウム箔としての可視光反射率を低下させる原因になる。鉄の含有量が０．５質量％以上になると、添加している鉄が全て晶出した場合、Ａｌ‐Ｆｅ系金属間化合物としてのＦｅＡｌ３の晶出量が１．２質量％を超えて存在することになり、光沢度は８２．２％よりも低くなる。このため、鉄の含有量を０．５質量％以下にする必要がある。また、鉄の含有量が０．００１質量％未満であると、アルミニウム箔の強度が低下する。 The composition of the aluminum foil of the present invention is not particularly limited, but the iron (Fe) content is preferably 0.001% by mass to 0.5% by mass. Since iron has a low solid solubility in aluminum, intermetallic compounds such as FeAl 3 are easily crystallized during the casting of aluminum. These crystallized substances have a lower reflectance in the visible light region than the aluminum base, and cause a decrease in the visible light reflectance as the aluminum foil. When the iron content is 0.5% by mass or more, when all of the added iron is crystallized, the crystallization amount of FeAl 3 as the Al—Fe intermetallic compound exceeds 1.2% by mass. Will be present and the gloss will be lower than 82.2%. For this reason, it is necessary to make iron content into 0.5 mass% or less. Moreover, the intensity | strength of aluminum foil falls that content of iron is less than 0.001 mass%.
　また、本発明のアルミニウム箔においてマンガン（Ｍｎ）の含有量は０．５質量％以下であることが好ましい。鉄と同様にマンガンもアルミニウムへの固溶度が小さいため、アルミニウムの鋳造時にＡｌ‐Ｆｅ‐Ｍｎ系の化合物等が晶出しやすくなる。Ａｌ‐Ｆｅ‐Ｍｎ系の晶出物は、Ａｌ‐Ｆｅ系の晶出物よりも微細であるが、これらの晶出物は、アルミニウム素地よりも可視光領域の反射率が低く、アルミニウム箔としての可視光反射率を低下させる原因になる。マンガンの含有量が０．５質量％以上になると、添加しているマンガンが全て晶出した場合、Ａｌ‐Ｆｅ‐Ｍｎ系金属間化合物が１．５質量％を超えて存在することになり、光沢度は８２．２％よりも低くなる。このため、マンガンの含有量を０．５質量％以下にする必要がある。 Further, in the aluminum foil of the present invention, the content of manganese (Mn) is preferably 0.5% by mass or less. Like iron, manganese has a low solid solubility in aluminum, so that Al—Fe—Mn compounds and the like are easily crystallized during the casting of aluminum. The Al-Fe-Mn crystallized material is finer than the Al-Fe based crystallized material, but these crystallized materials have a lower reflectance in the visible light region than the aluminum base, and are used as an aluminum foil. This causes a decrease in the visible light reflectance. When the manganese content is 0.5 mass% or more, when all of the added manganese is crystallized, the Al-Fe-Mn intermetallic compound is present in an amount exceeding 1.5 mass%, The gloss level is lower than 82.2%. For this reason, it is necessary to make manganese content into 0.5 mass% or less.
　さらに、本発明のアルミニウム箔においてシリコン（Ｓｉ）の含有量は０．００１％質量％以上０．３質量％以下であることが好ましい。シリコンはアルミニウムへの固溶度が大きく晶出物を形成し難いため、アルミニウム箔において晶出物を生成させない程度の含有量であれば可視光領域の反射率を低下させることがない。また、シリコンを含むと固溶強化によってアルミニウム箔の機械的強度を向上させることができるので、厚みが薄い箔の圧延を容易にすることができる。シリコンの含有量が０．００１質量％未満では、上述の効果を十分に得ることができない。シリコンの含有量が０．３質量％を超えると、粗大な晶出物が発生しやすくなり、反射特性が低下するだけでなく、結晶粒の微細化効果も損なわれるため、強度と加工性も低下する傾向にある。 Furthermore, in the aluminum foil of the present invention, the content of silicon (Si) is preferably 0.001% by mass or more and 0.3% by mass or less. Since silicon has a high solid solubility in aluminum and hardly forms a crystallized substance, the reflectivity in the visible light region is not lowered if the content is such that no crystallized substance is generated in the aluminum foil. In addition, when silicon is included, the mechanical strength of the aluminum foil can be improved by solid solution strengthening, so that the thin foil can be easily rolled. If the silicon content is less than 0.001% by mass, the above-described effects cannot be obtained sufficiently. If the silicon content exceeds 0.3% by mass, coarse crystals are likely to be generated, and not only the reflection characteristics are deteriorated, but also the effect of refining crystal grains is impaired, so that the strength and workability are also improved. It tends to decrease.
　本発明のアルミニウム箔においてマグネシウム（Ｍｇ）の含有量は３質量％以下であることが好ましい。マグネシウムはアルミニウムへの固溶度が最大で１８質量％と大きく、晶出物の発生が極めて少ないため、アルミニウム箔の反射特性に大きな影響をおよぼすことなく、アルミニウム箔の機械的強度を改善することができる。しかし、マグネシウムの含有量が３質量％を超えると、アルミニウム箔の機械的強度が高くなりすぎるので、アルミニウム箔の圧延性が低下する。アルミニウム箔の好ましい反射特性と機械的強度とを兼ね備えるためには、マグネシウムの含有量を２質量％以下にすることがさらに好ましい。 In the aluminum foil of the present invention, the content of magnesium (Mg) is preferably 3% by mass or less. Magnesium has a maximum solid solubility in aluminum of 18% by mass and the occurrence of crystallized substances is extremely small, so the mechanical strength of the aluminum foil should be improved without greatly affecting the reflective properties of the aluminum foil. Can do. However, if the magnesium content exceeds 3% by mass, the mechanical strength of the aluminum foil becomes too high, so that the rollability of the aluminum foil is lowered. In order to combine the preferable reflection characteristics and mechanical strength of the aluminum foil, the magnesium content is more preferably 2% by mass or less.
　なお、本発明のアルミニウム箔は、上記の特性と効果に影響を与えない程度の含有量で、銅（Ｃｕ）、亜鉛（Ｚｎ）、チタン（Ｔｉ）、バナジウム（Ｖ）、ニッケル（Ｎｉ）、クロム（Ｃｒ）、ジルコニウム（Ｚｒ）、ホウ素（Ｂ）、ガリウム（Ｇａ）、ビスマス（Ｂｉ）等の元素を含んでいてもよい。 The aluminum foil of the present invention has a content that does not affect the above characteristics and effects, and includes copper (Cu), zinc (Zn), titanium (Ti), vanadium (V), nickel (Ni), Elements such as chromium (Cr), zirconium (Zr), boron (B), gallium (Ga), and bismuth (Bi) may be included.
　上記で説明してきたように本発明のアルミニウム箔は、文字通り「箔」であって、一般的に厚みが５００μｍ程度以上となる「アルミニウム板」とは異なり以下のような種々のメリットを有する。すなわち、アルミニウム箔は、軽量化に特に優れるとともに成形加工が容易であり、またアルミニウム板では困難である湾曲物への貼り付け等の形状追従性やフレキシブル性を示すというメリットがある。また、廃棄物の減量につながる等、環境に対する負荷の面でもアルミニウム板に対するメリットを有する。 As described above, the aluminum foil of the present invention is literally a “foil” and has the following various merits, unlike an “aluminum plate” having a thickness of about 500 μm or more. That is, the aluminum foil has advantages in that it is particularly excellent in weight reduction and is easy to mold, and exhibits shape followability and flexibility such as sticking to a curved object, which is difficult with an aluminum plate. Moreover, it has the merit with respect to an aluminum plate also in terms of the load with respect to an environment, such as leading to the reduction of waste.
　したがって、このような本発明のアルミニウム箔は、上記のメリットを活かし、照明機器の反射材、住宅等の採光用反射材、ストロボ反射材、ソーラークッカー（太陽光の集光による調理器具用反射材）、包装材、装飾材等の用途に好適に利用することができる。 Therefore, such an aluminum foil of the present invention makes use of the above-mentioned merits, reflecting a reflector for lighting equipment, a reflector for lighting such as a house, a strobe reflector, and a solar cooker (reflector for cooking utensils by collecting sunlight). It can be suitably used for applications such as packaging materials and decorative materials.
　以下に説明するように本発明の実施例と比較例のアルミニウム箔の試料を作製した。
　表１に示す組成Ａ～Ｆのアルミニウムを用いて、表２に示す製造工程に従って、表３に示す実施例１～５と比較例１～９のアルミニウム箔の試料を作製した。なお、表１において「その他元素計」とは、ＪＩＳで規定される元素以外の不可避不純物元素（Ｂ、Ｂｉ、Ｐｂ、Ｎａなど）の合計含有量を示す。 As will be described below, samples of aluminum foils of Examples and Comparative Examples of the present invention were prepared.
Using aluminum of compositions A to F shown in Table 1, samples of aluminum foils of Examples 1 to 5 and Comparative Examples 1 to 9 shown in Table 3 were prepared according to the manufacturing process shown in Table 2. In Table 1, “other element meter” indicates the total content of inevitable impurity elements (B, Bi, Pb, Na, etc.) other than the elements specified by JIS.
　表２に示すように、製造工程は、ＤＣ鋳造によって得られたアルミニウムの鋳塊を加熱炉にて所定の温度と時間で均質化熱処理を行った。その後、厚みが約６．５ｍｍになるまで熱間圧延を行った。得られた熱間圧延材を用いて複数回の冷間圧延を行い、冷間圧延の途中で所定の温度と時間で中間焼鈍を実施し、厚みが所定の値になるまで冷間圧延を行い、表３に示す厚みのアルミニウム箔の試料を作製した。この際、実施例１～５と比較例１～４、９については、最終仕上げ冷間圧延において表面粗さＲａが４０ｎｍの圧延ロールを使用し、３５％の圧下率で圧延を行った。比較例５については、最終仕上げ冷間圧延において表面粗さＲａが４０ｎｍの圧延ロールを使用し、３３％（３５％よりも小さい）の圧下率で圧延を行った。比較例６～８については、最終仕上げ冷間圧延において表面粗さＲａが１５０ｎｍ（４０ｎｍよりも大きい）の圧延ロールを使用し、３５％の圧下率で圧延を行った。 As shown in Table 2, in the manufacturing process, an ingot of aluminum obtained by DC casting was subjected to homogenization heat treatment at a predetermined temperature and time in a heating furnace. Thereafter, hot rolling was performed until the thickness became about 6.5 mm. Using the obtained hot rolled material, cold rolling is performed a plurality of times, intermediate annealing is performed at a predetermined temperature and time during the cold rolling, and cold rolling is performed until the thickness reaches a predetermined value. Samples of aluminum foil having thicknesses shown in Table 3 were prepared. At this time, in Examples 1 to 5 and Comparative Examples 1 to 4 and 9, rolling was performed at a rolling reduction of 35% using a rolling roll having a surface roughness Ra of 40 nm in the final finish cold rolling. For Comparative Example 5, rolling was performed at a rolling reduction of 33% (less than 35%) using a rolling roll having a surface roughness Ra of 40 nm in the final finish cold rolling. For Comparative Examples 6 to 8, rolling was performed at a rolling reduction of 35% using a rolling roll having a surface roughness Ra of 150 nm (greater than 40 nm) in the final finish cold rolling.
　なお、均質化熱処理時間は、一般的な処理時間内であればよく、表２に示す時間に限定されるものではない。中間焼鈍条件は、表２に示す温度と時間に限定されるものではなく、一般的な操業条件の範囲内であればよい。 In addition, the homogenization heat treatment time may be within a general treatment time, and is not limited to the time shown in Table 2. The intermediate annealing conditions are not limited to the temperatures and times shown in Table 2, and may be within the range of general operating conditions.
　得られたアルミニウム箔の各試料について、光学顕微鏡にて表面状態を観察し、晶出物の表面積と１個当たりの平均表面積を測定した。また、アルミニウム箔の各試料について表面凹凸を評価するために原子間力顕微鏡による観察に基づいて表面粗さＲａとＴＤ方向の表面粗さＲｚの値を測定した。さらに、アルミニウム箔の各試料について反射特性を評価するために可視光の全反射率を測定した。以下、これらの測定方法について説明する。 For each sample of the obtained aluminum foil, the surface state was observed with an optical microscope, and the surface area of the crystallized material and the average surface area per one were measured. Moreover, in order to evaluate surface unevenness | corrugation about each sample of aluminum foil, the value of surface roughness Ra and surface roughness Rz of TD direction was measured based on observation by an atomic force microscope. Furthermore, the total reflectance of visible light was measured in order to evaluate the reflection characteristics of each sample of the aluminum foil. Hereinafter, these measurement methods will be described.
　光学顕微鏡観察は、ニコン株式会社製のECLIPSE　L200を用い、５００倍の倍率にてアルミニウム箔の表面を観察した。得られた１７４μｍ×１３４μｍの矩形の視野における表面観察画像より、晶出物とアルミニウム素地とを２値化して、視野内に存在するすべての晶出物の表面積を測定した。個々の晶出物の表面積の測定値と視野の表面積とから、視野の表面積に対するすべての晶出物の総表面積の割合を算出し、個々の晶出物の表面積の測定値と視野内で観察される晶出物の個数とから晶出物の１個当たりの平均表面積を算出した。表面観察画像は試料の幅方向で中央部付近を５点取り、それぞれの視野内ごとに算出した晶出物の総表面積の割合と晶出物の１個当たりの平均表面積について５点の平均値を表３に示す。 In the optical microscope observation, an ECLIPSE L200 manufactured by Nikon Corporation was used, and the surface of the aluminum foil was observed at a magnification of 500 times. From the obtained surface observation image in a rectangular field of 174 μm × 134 μm, the crystallized material and the aluminum substrate were binarized, and the surface areas of all the crystallized materials existing in the field of view were measured. Calculate the ratio of the total surface area of all crystals to the surface area of the field from the measured surface area of the individual crystals and the surface area of the field of view. The average surface area per crystallized product was calculated from the number of crystallized products. The surface observation image takes 5 points near the center in the width direction of the sample, and calculates the average value of 5 points for the ratio of the total surface area of the crystallized material calculated for each field of view and the average surface area per crystallized material. Table 3 shows.
　原子間力顕微鏡による表面凹凸の観察は、セイコーインスツルメンツ株式会社製の走査型プローブ顕微鏡　Nanopics1000を用いて、ダンピング方式（非接触）による表面形状を８０μｍ×８０μｍの矩形の視野で行った。得られた観察結果に対して、最小二乗近似によって曲面を求めてフィッティングを行う３次曲面自動傾き補正で試料の傾きを補正し、表面粗さＲａと圧延方向に対して垂直な幅（ＴＤ）方向の表面粗さＲｚとを測定した。表面粗さＲａは、ＪＩＳ　Ｂ０６０１（１９８２年版）で定義されている中心線平均粗さＲａを、観察された表面全体に対して適用できるように三次元に拡張して算出された値である。幅（ＴＤ）方向の表面粗さＲｚは、同視野内の任意の幅（ＴＤ）方向の断面における２次元でのＲｚ値をＪＩＳ　Ｂ０６０１（１９８２年版）に基づいた評価方法で測定した。表面粗さＲａとＲｚの値を表３に示す。 Observation of surface irregularities with an atomic force microscope was performed using a scanning probe microscope Nanopics 1000 manufactured by Seiko Instruments Inc., and a surface shape by a damping method (non-contact) with a rectangular field of view of 80 μm × 80 μm. The obtained observation result is corrected by a cubic curved surface automatic inclination correction that performs fitting by obtaining a curved surface by least square approximation, and a surface roughness Ra and a width (TD) perpendicular to the rolling direction. The surface roughness Rz in the direction was measured. The surface roughness Ra is a value calculated by extending the centerline average roughness Ra defined in JIS B0601 (1982 edition) in three dimensions so that it can be applied to the entire observed surface. The surface roughness Rz in the width (TD) direction was measured by an evaluation method based on JIS B0601 (1982 version) for a two-dimensional Rz value in a cross section in an arbitrary width (TD) direction within the same visual field. Table 3 shows the values of the surface roughness Ra and Rz.
　光沢度の測定は、日本電色工業株式会社製Gloss　meter　VG7000を用い、光入射角６０°で光沢度を測定した。光沢度の測定は圧延方向（ＭＤ）と圧延方向に対して垂直な方向（ＴＤ）との二つの方向で測定し、これらの平均値として光沢度を評価した。これらの光沢度の測定値と平均値を表３に示す。 Glossiness was measured using a gloss meter VG7000 manufactured by Nippon Denshoku Industries Co., Ltd., with a light incident angle of 60 °. The glossiness was measured in two directions, a rolling direction (MD) and a direction perpendicular to the rolling direction (TD), and the glossiness was evaluated as an average value of these. Table 3 shows the measured values and average values of these gloss levels.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000003
Figure JPOXMLDOC01-appb-T000003
　表３に示す結果から、アルミニウム箔の表面に存在する晶出物の総表面積の割合が２％以下で、晶出物の１個当たりの平均表面積が２μｍ２以下であり、かつ、ＴＤ方向の表面粗さＲｚが４０ｎｍ以下、表面粗さＲａが１０ｎｍ以下である実施例１～５のアルミニウム箔は高い反射特性を示し、光沢度は８２．２％よりも高い値が得られている。 From the results shown in Table 3, the ratio of the total surface area of the crystallized substances existing on the surface of the aluminum foil is 2% or less, the average surface area per crystallized substance is 2 μm 2 or less, and in the TD direction. The aluminum foils of Examples 1 to 5 having a surface roughness Rz of 40 nm or less and a surface roughness Ra of 10 nm or less show high reflection characteristics, and the glossiness is higher than 82.2%.
　これに対して、比較例１～９のアルミニウム箔では、アルミニウム箔の表面に存在する晶出物の総表面積、晶出物の１個あたりの平均表面積、ＴＤ方向の表面粗さＲｚ、および表面粗さＲａの少なくともいずれか１つが上記の範囲から外れていることにより、光沢度は８２．２％よりも小さい値となり、既存のアルミニウム箔と同等またはそれ以下である。なお、実施例４と比較例９では、同じ組成Ｆを用い、同じ製造工程であるにもかかわらず、晶出物の総表面積および平均表面積が異なる。これは、上述したＤＣ鋳造の冷却速度を変えることによって晶出物の量が変化することによるものである。 On the other hand, in the aluminum foils of Comparative Examples 1 to 9, the total surface area of the crystallized substances present on the surface of the aluminum foil, the average surface area per crystallized substance, the surface roughness Rz in the TD direction, and the surface When at least one of the roughness Ra is out of the above range, the glossiness becomes a value smaller than 82.2%, which is equal to or less than that of the existing aluminum foil. In Example 4 and Comparative Example 9, the same composition F was used, and the total surface area and average surface area of the crystallized materials differed even though they were the same manufacturing process. This is because the amount of the crystallized substance is changed by changing the cooling rate of the DC casting described above.
　以上の結果より、本発明によって、従来実現しなかった高い光沢度を有しているアルミニウム箔を得ることができたことがわかる。 From the above results, it can be seen that according to the present invention, an aluminum foil having a high glossiness that has not been realized in the past could be obtained.
　今回開示された実施の形態と実施例はすべての点で例示であって制限的なものではないと考慮されるべきである。本発明の範囲は以上の実施の形態と実施例ではなく、請求の範囲によって示され、請求の範囲と均等の意味および範囲内でのすべての修正と変形を含むものであることが意図される。 It should be considered that the embodiments and examples disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is shown not by the above embodiments and examples but by the claims, and is intended to include all modifications and variations within the meaning and scope equivalent to the claims.
　本発明の可視光反射材用アルミニウム箔は、従来よりも高い光沢度を有するので、本発明の可視光反射材用アルミニウム箔を反射材に適用した場合に光のエネルギー損失をより低減させて光を伝送することができる。 Since the aluminum foil for visible light reflecting material of the present invention has a higher gloss than before, when the aluminum foil for visible light reflecting material of the present invention is applied to a reflecting material, light energy loss is further reduced and light is reduced. Can be transmitted.

Claims (3)

  1. 　予め定められた表面積に存在する晶出物の総表面積の割合が２％以下であり、
    　前記晶出物の１個当たりの平均表面積が２μｍ２以下であり、
    　圧延方向と垂直な方向の表面粗さＲｚが４０ｎｍ以下であり、かつ、
    　表面粗さＲａが１０ｎｍ以下である、可視光反射材用アルミニウム箔。     The proportion of the total surface area of the crystallized material present in the predetermined surface area is 2% or less,
    The average surface area per one crystallized product is 2 μm 2 or less,
    The surface roughness Rz in the direction perpendicular to the rolling direction is 40 nm or less, and
    The aluminum foil for visible light reflectors whose surface roughness Ra is 10 nm or less.
  2. 　当該アルミニウム箔の厚みが４μｍ以上２００μｍ以下である、請求項１に記載の可視光反射材用アルミニウム箔。 The aluminum foil for a visible light reflector according to claim 1, wherein the thickness of the aluminum foil is 4 µm or more and 200 µm or less.
  3. 　請求項１または請求項２に記載の可視光反射材用アルミニウム箔を製造する方法であって、
    　表面粗さＲａが４０ｎｍ以下である圧延ロールを用いて圧下率が３５％以上の条件でアルミニウム箔を最終仕上げ冷間圧延することを含む、可視光反射材用アルミニウム箔の製造方法。     A method for producing the aluminum foil for visible light reflecting material according to claim 1 or 2,
    A method for producing an aluminum foil for a visible light reflecting material, comprising subjecting an aluminum foil to final finish cold rolling under a condition where the rolling reduction is 35% or more using a rolling roll having a surface roughness Ra of 40 nm or less.
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