DE10313502A1 - Rolled product, method and device for its production and use of the rolled product - Google Patents

Abstract

A rolled product, in particular a rolled product made of a metallic material such as an aluminum sheet, is proposed for use in lighting technology as a reflector surface, in which the surfaces on both sides of the rolled product show essentially the same reflection behavior. Such a rolled product is particularly suitable as a material for the construction of a reflector or for the glare protection of a grid light. It is proposed to produce the rolled product in that the rolled product is first rolled and then the two optionally differently reflecting surfaces are brought to a similar reflection behavior by a glossing process following the rolling.

Description

The The invention relates to a rolled product, in particular a rolled product made of a metallic material for use as a reflector material in lighting technology, with a first surface and a second surface, at which the surfaces a scattering reflection behavior for light on both sides demonstrate. The invention further relates to a method for manufacturing of the rolled product, an apparatus for performing the manufacturing process for the Rolled product and its use.

metal sheets such as rolled aluminum sheets in particular can be found in technology for different Tasks application. For example, rolled aluminum sheets successful for a long time as a reflector for Housing, especially for luminaire housing of fluorescent lamps (e.g. linear luminaires with and without blind grids) used. To one for it is customary to achieve a sufficient degree of gloss for this purpose required the rolled sheet to shine afterwards what for example mechanically (e.g. by polishing) or but by electrolytic or chemical means (through treatment in caustic baths), however can also be achieved as a combination thereof.

The requirements for luminaire housings of fluorescent lamps are based on the old DIN 5035, UGR DIN 12464 and the newly revised standard DIN 5035-part 7. These standards aim to prevent glare to people who are in the stay in the room with the appropriate light. This is particularly important for VDU workstations. In the standard, for example, a downward light emission behavior is required, different luminances being permissible depending on the radiation angle. The standard is currently being revised. According to the old DIN 5035 standard, for example, a luminance of a maximum of 200 cd / m ^{2 is} permissible at a 50 ° angle (starting from the vertical). According to the new DIN5035 Part 7, this value will probably be raised to 1000 cd / m ² , provided the screens used meet certain minimum requirements.

The Production of the reflector sheets described above - in particular of aluminum sheets - through several graded rolling processes is known per se.

at the usual so far Sheet metal was always manufactured on the premise that only one of the two sides of the sheet has a defined reflection behavior for incident Must have light.

For manufacturing reasons the rolled raw sheets have different surface qualities on your Top and bottom on. To use the raw sheets as a reflector sheet to be able are glossy processes required. This glossy process So far, however, only one of the two surfaces of the Rolled product applied. This was based on the assumption that a good reflection behavior on only one surface of the Sheet for its use as a reflector plate is completely sufficient and thus Costs can be saved.

It However, it has been found that for some reflector arrangements It is advantageous if both surfaces of the reflector plate are on have essentially the same light scattering behavior. For certain With such a sheet metal reflector arrangements, the arrangement can be manufactured much easier, since a number of Manufacturing steps an otherwise necessary separation process and a followed by Connection process by simply punching and bending the proposed one Sheet metal can be replaced. This corresponds to the so-called follow-up production. Also for the Use as anti-glare slats is a different reflection behavior from front and back of the aluminum sheet is undesirable from a lighting point of view, since this is either Appearance disturbs, or the two-layer anti-glare slat, e.g. B. as a V-slat got to.

On Another problem with known aluminum sheets is that also for the surface provided for the reflection of the rolled sheet usually has an anisotropic light scattering behavior. That is, one on the sheet surface incident light beam is expanded conically in the reflection, wherein the cone in cross-section, however, not a circle as a base, but a different form, like an ellipse as usual Floor space having. This reflection behavior leads to largely random lighting conditions and is therefore undesirable.

Highly diffuse light scattering is also undesirable, since this results in too little directivity and therefore too little influence on the lighting conditions, and also the recommendations of DIN 5035, part 7 would be missed. In particular, a regulated light scattering behavior is then usually not achievable. A high-gloss surface is ideal for achieving the lighting requirements, but the resulting lighting behavior is perceived by many people as unaesthetic and is therefore undesirable.

task The invention is therefore to propose a rolled product that is In terms of its properties, it is particularly suitable for use as a reflector material suitable in lighting technology, as well as one for the production of such Rolling product particularly suitable manufacturing process. Farther should be a suitable device for performing the manufacturing process as well as an advantageous use of the proposed rolled product Tobe offered.

to solution accomplishes this task the teaching of the independent claim; give the subclaims favorable Further training. In addition, all fall within the scope of the invention Combinations of at least two of those in the description, the drawing and / or the claims disclosed features.

in the Within the scope of the invention, a rolled product with a first surface and a second surface, where the surfaces a scattering reflection behavior for light on both sides show proposed, in which the reflection behavior of both surfaces in Is essentially the same. In deviation from what has been the case up to now Paradigm that only one surface to avoid unnecessary costs is processed so that it receives the required reflection behavior So suggested that both surfaces of the sheet have the desired reflection behavior show, which is preferably a regulated light scattering behavior should act. This can make the manufacturing process more expensive for the Roll product and thus the rolled product itself, but they can Disadvantages due to an improved reflection behavior and a simpler one Structure of the lights, mirror optics and other manufactured from it light-directing components such. B. light grid, for a variety be weighed by applications.

So could for example anti-glare slats of louvre luminaires with the proposed rolled product just one piece of the proposed sheet without the appearance of the lamp or the light emitted by it shows undesirable inhomogeneities. Also for certain reflector arrangements can be advantageous for the rolled product can be used because there is a separation at a jump line of the reflector the sheet, turning it 180 ° and then connecting it of the two parts is no longer necessary. Instead, at Use of the proposed sheet by a composite production essentially the same with simple punching and bending Result can be achieved. In this follow-up production, the Mirror optics by punching and bending a single piece of For example, aluminum sheet is made, so that a complex assembly of several parts, including the rest it must always be ensured that the surfaces at the assembly processes not scratched; become dispensable. So far, too the necessary marking of the preferred direction for direction-dependent surfaces is no longer necessary.

Of It is an advantage if the surfaces show at least partially diffusely scattering reflection behavior. Due to the diffuse light scattering, a more even illumination behavior can be achieved be improved in different directions. Preferably show the surfaces one if possible regulated diffusely scattering reflection behavior. This can in particular also wishes in terms of of an aesthetic Appearance of the mirror optics.

Of It is an advantage if the surfaces show an essentially isotropic reflection behavior. That too can provide even illumination as well as improved anti-glare protection. As an isotropic It is called reflection behavior if it starts from the reflector surface light beam rotationally symmetrical to the main emission direction (i.e. to the gloss angle) is. With a reflection with a certain diffuse beam expansion would like that for example, a light cone from an incident laser beam with a circle as the base arise, with several concentric circular lines each for lines same light intensity stand.

In It has proven to be sufficient if the tests are carried out in different ways Directions measured gloss levels of the surfaces by less than 15%, preferably by less than 12%, particularly preferably by less than 9%, preferably differ by less than 6%. This can on the one hand a largely optimal radiation can be achieved, on the other hand holds out the manufacturing effort within limits, so that the production of the rolled product not overly expensive becomes. Values, for example, are to be regarded as gloss levels with a reflector meter according to Dr. Long, according to DIN 67530 with a measuring angle measured from 60 ° can be. The measuring device was calibrated with a metal mirror and set to 91%.

As well it turned out to be cheap proven if the gloss levels of the surfaces are higher than 45%, preferably higher than 50%, particularly preferably higher than 60%, preferably higher than 70%.

It is also advantageous if the gloss levels of the first and second surfaces of the rolled product are less than 15%, preferably two differ by less than 12%, particularly preferably by less than 9%, preferably by less than 6.

As well it is preferable if the total reflection is greater than 80%, preferably greater than 84%, particularly preferably larger than Is 86%. This is the total reflection according to DIN 5036 part 3 for visible light. The visible light can be the standard illuminant A (artificial light) or around the standard light type D65 (daylight) act.

The Values can be realized particularly advantageously if the surfaces have a shiny surface layer, an anodized surface layer or have a combination of these.

To the Protection of the surfaces can at least one transparent scratch protection layer, at least a transparent corrosion protection layer or a combination from those arranged on the surfaces become.

It goes without saying a combination of the surface layers mentioned with one another is also possible.

Farther it has proven to be particularly advantageous if the rolled product consists of aluminum or its alloys or aluminum and whose alloys contains the aluminum base metal having a purity of at least 99% by weight, in particular at least 99.5% by weight, preferably at least 99.8 % By weight, particularly preferably at least 99.85% by weight, preferably at least Contains 99.9% by weight, particularly preferably at least 99.95% by weight.

It by the way noted that all previously mentioned intervals also all intermediate values as with should be considered disclosed.

Advantageous it is when the rolled product first is rolled and then shone is such that the desired Reflection behavior results. The raw product created by rolling can by any known glossing process, such as mechanical polishing methods, electrolytic or chemical gloss processes, etc. or by a combination of these can be edited.

As well however, it is possible that the surfaces first are trained with different reflection behavior, and subsequently at least one surface shone is such that the surfaces receive an essentially identical reflection behavior. With this In particular, the process can use existing production lines become. The different surface condition is then indicated by a glossing process the rougher or matt surface balanced, so that as a result both surfaces are essentially the same Have reflection behavior. Of course it is also possible that both surfaces shone be, then of course a surface stronger that other surface less shiny must become.

Of It is advantageous if the rolling process has several rolling steps, and preferably at least one cleaning step for cleaning the Surfaces. If the rolling process takes place in several steps, the respective one Deformation of the rolling stock is less so that the surface defects are also reduced become. The individual rolling steps in between, or finally, can be a or several cleaning steps are provided for cleaning the surfaces become.

Preferably is used to clean the surfaces a strong alkaline bath is used. Such a bathroom has already been found in treating more conventional Sheets proved to be advantageous.

at one to carry out the device described particularly suitable manufacturing process rollers are provided, the ones processing the rolled product Roll blasted surfaces have, in particular blasted with round or angular blasting material Surfaces. Corundum or carbides have proven themselves as such blasting material. The Blasting should be done in such a way that there is a homogeneous and isotropic roll surface results.

A can further surface finish consist in the fact that the rolls processing the rolled product have surfaces, caused by the so-called "laser beam finishing "," electron beam finishing "or" electron discharge texturing "were prepared. A combination of these methods, also with the one described above Blasting the surfaces, is Of course possible.

Farther it makes sense to provide at least one speed synchronization device which is a substantially uniform speed of roll surfaces and the surfaces of the rolling stock to be processed. So essentially it comes down no relative movements between roller surfaces and the surfaces of the rolling stock to be processed. Thus, longitudinal grooves in particular be avoided with regard to an isotropic reflection behavior the corresponding surfaces could be problematic.

It is advantageous if the rolled product described for the reflector a lamp, for the glare protection of a lamp or for both is used. Especially This is particularly advantageous in the case of luminaires for fluorescent tubes, such as z. B. in so-called linear or grid lights. It goes without saying also a use for so-called Plug-in grid, through-grid, projection reflector plates and for others Reflectors in which the active side is illuminated on both sides is used, conceivable.

Further Advantages, features and details of the invention result from the following description of a preferred embodiment as well as from the drawing; this shows in:

1 : the schematic structure of the measurement method;

2 : Projection images of different surfaces;

3 : Lines of equal brightness for the in

4 shown projection images.

The Rolling process for producing the sheets from a blank takes place in a manner known per se. For example, a blank of given thickness in one or more runs or stitches between one or more pairs of rollers to the desired one Rolled thickness. The material web can go between two rollers and moved, or moved in a continuous direction and rolled by a plurality of pairs of rollers. Also one Combination of both options is conceivable.

Then follows in the present example, a structuring of the surface of the Rolled product by means of an appropriately trained pair of rollers. By structuring the pair of rollers, a corresponding one Structuring achieved on the two surfaces of the material web to certain, predetermined optical properties of the surfaces achieve.

Subsequent to a surface finish can also be carried out during the rolling process. You can known surface processing methods, Material deposition process or material application process can be used.

For example can be a shine by electrolytic or chemical shining. Otherwise an electrolytic or chemical treatment not only for the surface treatment of the rolled product respectively. Also in the course of the manufacturing process, for example a chemical surface treatment possible through a strongly alkaline bath to protect the surfaces the next rolling step to clean.

As well is a surface treatment by Anodization possible. This can be caused, for example, by acidic electrolytes from the series of sulfuric acid, Phosphoric acid-, Citric acid-, tartrate or chromic acid electrolytes, as well as a combination of these. This can be done using both DC process, as well as by AC process.

Farther is a surface removal possible by vapor or gas separation from the vacuum. It can one or more layers of metals, semi-metals or their oxides, nitrides or fluorides, or mixtures thereof become.

As Evaporation processes can especially thermal evaporation, electron beam evaporation, Sputtering (especially magnetron sputtering) with and without ion support is provided become. In addition to these or other physical vapor deposition processes (physical vapor deposition, PVD) can of course also chemical vapor deposition (CVD) used with and without ion support become.

Also a transparent scratch protection layer or corrosion protection layer can be provided. Such a layer can in particular also a surface which has already been vapor-coated with a metal layer.

The described surface treatment steps are carried out in such a way that afterwards essentially similar surfaces of the rolled product result. So if the surfaces of the raw sheet one at first have different surface qualities, accordingly, different surface treatment steps are carried out on the two surfaces applied, or the applied remuneration steps performed in different intensities.

In 2 are projection images 29 different surfaces. It poses 2c represents a particularly suitable surface, in which case both surface sides of the rolled product show essentially the same reflection behavior.

In 1 is the measurement arrangement schematically to generate the in 2 shown projection images 29 shown. One by a laser 21 generated laser beam 22 falls on a first page 15 the material web 14 , For reasons of clarity, only a section of the material web is present 14 shown.

The incident laser beam 22 is from the first page 15 the material web 14 partly diffuse. To a preferred direction 25 around (this is determined according to the usual law of reflection) an expanded reflection beam is formed 24 out. This creates in a measuring range 27 Of the screen 26 a projection image 29 , The projection image 29 is from a camera 31 recorded, wherein in the illustrated embodiment, the angular distortion due to the recording of the projection image 29 was done at an angle, was corrected by an electronic computer (not shown here).

In the case of partial reflection, the projection image has a bright center 33 on, its position with the point of impact of the preferred direction 25 of the reflection beam 24 on the screen 26 matches. Around this center 33 around the light intensity decreases radially outwards.

In 2 are projection images 29 different surfaces shown. The in 2c surface shown the ideal of an isotropic expansion in a limited angular space of 2 °, for example, quite largely. The light intensity has dropped to a greater extent after the first circle of the crosshairs, and essentially completely after the second circle of the crosshairs. A circle of the crosshairs corresponds to an angular range of 2 °. Furthermore, in 2c clearly recognizable that the light scattering is essentially isotropic, hence the projection image 29 radially symmetrical to the center of the center 33 is.

The surface in 2 B is too shiny, however. In other words, the beam expansion is the reflection beam 24 too low. The light intensity has essentially dropped completely after an angular range of approximately 0.5 °. In addition, the light distribution is too anisotropic, ie the light decay in the X and Y directions of the coordinate system takes place at different speeds.

Both 2a and 2d the expansion of light is relatively pronounced; moreover, these surfaces are isotropic. This reflection behavior lies in a just just usable limit range.

In 2a Finally, a surface that is scattered too diffusely is shown, which moreover shows an excessive isotropy. The associated surface is similar to that of the 2 B associated surface can no longer be used for the intended purpose.

In 3 is another type of application for the projection diagrams 2 shown. The lines drawn represent lines of equal brightness 35 The respective subnumbering corresponds to that of 2 , It is therefore desirable to have a surface that shows the diagram of the 3c shows so that the lines of equal brightness are essentially circular around the center 33 lie around and lie at a defined distance from each other - the distance between the lines being a measure of the angular expansion of the reflection beam 24 represents.

The surfaces should preferably be the same on both sides of the rolled product and, ideally, the reflection behavior 2c respectively. 3c exhibit.

However, slight deviations between the two sides are tolerable. For example, a rolled product with a first side that has a scattering behavior 2c respectively. 3c has and the second side of a scattering behavior according 2 B or 2d respectively. 3b or 3d still advantageously be used to form a lamp reflector.

The Rolled products preferably consist of a metal such as in particular Aluminum. When using aluminum, the mass fraction should of the aluminum in the base material meet certain minimum requirements, such as for example at least a proportion by weight of more than 99% by weight, 99.5% by weight, 99.8% by weight, 99.85% by weight, 99.9% by weight and 99.95% by weight exhibit.

Claims (21)

Rolled product, in particular made of a metallic material for use as a reflector material in lighting technology, with a first surface and a second surface, in which the surfaces of both sides show a scattering reflection behavior for light, characterized in that the reflection behavior of both surfaces is essentially the same. Rolled product according to claim 1, characterized in that the surfaces show at least partially diffusely scattering reflection behavior. Rolled product according to claim 1 or 2, characterized in that that the surfaces show an essentially isotropic reflection behavior. Rolled product according to claims 1 to 3, characterized in that that the degrees of gloss measured in different directions Surfaces around less than 15%, preferably less than 12%, particularly preferably differ by less than 9%, preferably by less than 6. Rolled product according to one of the preceding claims, characterized characterized in that the gloss levels of the surfaces are higher than 45%, preferably higher than 50%, particularly preferably higher than 60%, preferably higher than 70%. Rolled product according to one of the preceding claims, characterized characterized that the gloss levels of the first and the second Surface around less than 15%, preferably less than 12%, particularly preferably differ by less than 9%, preferably by less than 6%. Rolled product according to one of the preceding claims, characterized characterized in that the total reflection is higher than 80%, preferably higher than Is 84%, particularly preferably is higher than 86%. Rolled product according to one of the preceding claims, characterized characterized that the surfaces a shiny one and / or anodized surface layer exhibit. Rolled product according to one of the preceding claims, characterized characterized in that at least one transparent on the surfaces Scratch protection layer and / or corrosion protection layer is arranged. Rolled product according to one of the preceding claims, characterized characterized that the rolled product from aluminum or its alloys consists or contains aluminum or its alloys, wherein the aluminum base metal has a purity of at least 99% by weight, in particular at least 99.5% by weight, preferably 99.8% by weight, particularly preferably at least 99.85% by weight, preferably at least 99.9 % By weight, particularly preferably contains at least 99.95% by weight. Rolled product according to at least one of claims 1 to 10, characterized by at least one other of the description and / or the characteristic that can be gathered from the drawing. Process for producing a rolled product according to one of the claims 1 to 11, characterized in that the rolled product is first rolled and then shone is such that the desired Reflection behavior results. A method according to claim 12, characterized in that the surfaces first are trained with different reflection behavior, and subsequently at least one surface shone is such that the surfaces get an essentially identical reflection behavior. A method according to claim 12 or 13, characterized in that the rolling process has several rolling steps, and preferably at least one cleaning step for cleaning the surfaces. A method according to claim 14, characterized in that to clean the surfaces strongly alkaline bath is used. Method according to at least one of claims 12 to 15, characterized by at least one other of the description and / or the characteristic that can be gathered from the drawing. Device for carrying out a method according to one of the claims 12 to 15, characterized in that the processing of the rolled product Roll blasted surfaces have, in particular blasted with round or angular blasting material Surfaces. Apparatus according to claim 17, characterized in that the rolls processing the rolled product have surfaces, by laser beam finishing, electron beam finishing and / or electron discharge texturing prepared were. Device according to claim 17 or 18, characterized in that that at least one speed synchronization device is provided which has a substantially similar speed of roller surfaces and the surfaces of the rolling stock to be processed. Device according to at least one of claims 17 to 19, characterized by at least one other of the description and / or the characteristic that can be gathered from the drawing. Use of a rolled product according to one of claims 1 to 10 for the reflector and / or the glare protection of a lamp, in particular a lamp for fluorescent tubes, like a grid light and / or a linear light.