DE2003953A1 - Steel sheet provided with protective layers and method for applying the protective layers - Google Patents

Description

With protective layers, provided sheet steel and method of applying the protective layers _:

The invention relates to a with a protective layer provided steel sheet and a method for applying the protective layers to such a steel sheet as it is used in particular for the construction of the walls of buildings and as a roofing material.

It has long been known with a metallic, preferably made of zinc-coated steel sheets for the purpose of building houses as wall parts or to be used for roof covering. In the still liquid, on The zinc that is applied to the steel sheet has an asbestos felt pressed into it and, in many cases, another one onto the asbestos felt bituminous mass used as weather protection, e.g. B. asphalt in a liquid state, for example by immersion Sheets in a bath, applied. You have that with you the high liquid zinc covered sheet along with the layers of felt passed between pressure rollers and the felt layers pressed into the zinc, see * US patent 2 075 334. Such sheets are also made in the form of corrugated sheets deformed. The metal sheets were also partially processed into tubular structures and fan housings.

The aim of the invention goes alongside and with the metallic Protective layer on at least one surface to apply a layer of material to such a steel sheet, which can also withstand high temperatures and

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which adheres to the protective layer to a particularly high degree lind also a particularly good adhesion for a has further weather-resistant outer covering of the sheet.

According to the invention, a protected metal sheet is produced by embedding a glass fiber mat in the molten mass of a protective metal layer which consists essentially of zinc, which adheres directly to the steel sheet. The result is a steel sheet, which φ 10 a metallic protective layer on at least one side which consists essentially of zinc. A glass fiber mat is pressed into the metallic protective layer, which is retained in the metallic protective layer in that it is partially embedded therein is.

The fiberglass mat can be j

a) a fiberglass structure produced by weaving, which essentially has uniformly shaped spaces between the warp threads and the weft threads, with between 10 and 20, calculated on the cm, warp threads and 10 to 20, α calculated on the cm, weft threads are present or "b) a mat made of randomly stored glass fibers, which are held in their disordered position by a suitable binding agent such as starch, resin or the like.

If necessary, an outer, weather-resistant covering, preferably provided with a coloring agent, can be applied that of the surfaces of the metal sheet are brought, on which the partially embedded fiberglass mat is located. When the weatherproof covering is particularly thin, e.g. B. on the order of O, O25nu &

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then the structure of the fiberglass mat is protected in the en. Metal surface easily recognizable. if stronger weather-resistant coatings, for example of a thickness of the order of 0.15 mm then the interstices of the fiberglass structure emerge as depressions and elevations of the fiberglass structure and no longer with the eye in the end product be recognizable.

If you have the product to be produced before the exterior is weather-resistant Coating is applied, a hand- J | treatment, in which a formation of zinc phosphate ^ takes place, a significantly better adhesion between Gflas is achieved. and metal. .

It was found that a chromate conversion treatment the adhesion of the glass to the finished surface Metal not upgraded. . '- -

The attached drawing shows: *

Mg. 1 is a cross section of one with a protective coating provided sheet metal,

Fig. 2 schematically shows a device which is suitable

to continuously apply the protective layer to a metal sheet,

3 shows a device which is somewhat modified compared to that of FIG. 2,

Fig. 4 schematically shows a final processing stage connected to

the place provided in Fig. 2 and 3 is set can be.

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In Pig. 1, 11 denotes the metal sheet, which is usually made of carbon steel and a Thickness between 1.9 mm and 0.7 mm. Thick between 1.9mm and 1.2mm are preferred.

Immediately on one surface of the steel body 11

there is a protective layer 12 made of metal. The layer consists mainly of zinc. The zinc adheres to the steel body 11 like a galvanic coating. In the metallic protective layer 12 is essentially all over Surface is embedded with a fiberglass mat, which is loaded with 13 ^ is drawn. When the fiberglass mat is one by terweaving is a product made of glass fibers, then warp threads 14 and weft threads 15 are recognizable.

In Fig. 1, the sheet provided with the coating is cut in such a way that a single warp thread 14 is straight becomes visible. One recognizes the undulating course of the thread with the elevations 14 a and the depressions 14 b. It can also be seen that the weft threads 15 sections 15 a have, in which they pass under the elevations 14 a of the warp threads, and continue to have sections 15 "b,

in which the weft threads were above the lower ones 14 b α of the warp threads are located. The drawing shows that the lower portions 15 a of the weft threads and the deeper parts 14 b of the warp threads are completely embedded in the metallic protective layer 12, while the elevations 14 a of the warp threads and the overhead parts 15 b of the weft threads outside the metallic Protective layer 12 lie and are not embedded in it. This aimed at according to the invention, only partial embedding of the fiberglass fabric 13 can be by carefully controlling the amount of protective metal applied as cover 12.

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When a mat with an even structure made of random stored glass fibers as glass fiber mat "is used, then cross each other, the threads - partly above and partly underneath and create intermingling spaces which "in one generated by a regular weaving process Had as shown in Mg. 1 ^ correspond. Each .'Jaden is partially embedded in the index Schutizmet and held by this -partly .embedding. '

/ 10 A weather-resistant protective layer 16 is applied to the glass fiber mat 13. ¥ ie in Fig. 1 too. recognize, this outer covering 16 is relatively thick. This means that the structure of the glass fiber mat ″ 13 cannot be seen through the cover layer 16.

The weather resistant outer cover 16 can be an alkyd resin, it can be a urethane blanket Polyvinyl chloride or polyvinyl fluoride resin, a silicone poor residue Erarζ to paint, varnish or the like. Act. The weather-resistant outer layer 16 preferably has sufficient ductility to permit bending or rolling of the sheet metal 10 is possible, even after the layer 16 has been applied to the one surface.

In the device for coating metal sheets with protective layers according to the invention, as shown in FIG is a steel band with a thickness between 1.9 and 0.7 now and a width between 45 and 150 cm withdrawn from a Holle 20. The one peeled off the roll Band 21 is immersed in a container. 22, which has a supply on the molten protective metal, which consists essentially of zinc. The molten metal 23 may optionally contain aluminum or lead in small amounts. Other molten metals can be in the container

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ter 23 may be present as impurities in insignificant amounts. The tape 21 is preferably before it is over the revolving rollers 24 is guided, subjected to cleaning, whereby oxide layers and grease are replaced by appropriate Washing processes are removed. Usually a hold-down roller 24 is provided in the container 22 to prevent the To hold tape 21 under the surface of the molten metal 25 for a desired length of time, so that it can become a layer of molten metal of acceptable thickness is deposited on it. The tape emerging from the container 22

W is passed through a heating zone 26 in which external heat prevents the molten metal coating from prematurely solidifying on the surface of the strip. The strip provided with the molten metal coating is then passed between a pair of rollers 27 and 28 set in rotation, the axes of which are perpendicular to one another and are pressed against one another at the point of contact with considerable pressure. Pressures of around 18 t are appropriate here. The rollers 27 and 28 are preferably made of tool steel and are used to absorb the sensible heat contained in the molten metal coating and the molten

£ zene metal to cool while it's in and through the point of contact the reels are running.

A roll 29 with the fiberglass mat is located in the Proximity of pressure rollers 27 and 28. A layer 30 of the fiberglass mat is from the roller 29 via pulleys 3I and 32 withdrawn and into the gap between the pressure chambers and 28 inserted together with the tape covered with the molten metal. The layer 30 is thereby pressed into the molten metal covering at the same moment that it was pressed by its contact with the rollers 27 and 28 is held, and thereby one achieves that the metal covering within the fabric layer30,

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which is partially embedded in it, comes to a freeze.

The lower side of the band 21 is preferably not with a fiberglass mat "covered, but carries a -proportional thin film of the protective metal so that they-against. corrosive influences are assured. The thickness of the Layer on the underside of the metal band can be put in precisely-steer in such a way that one is flame, steam or hot Allowing gases to act on the surface or by acting mechanically on this surface /, for example by wiping or by rolling while the protective Metal layer is still in a molten state.

From the pressure point between the pressure rollers 27 and 28 the tape arrives at a suitable pulley 33 Device 36 which completes the treatment. Here will the tape is wound up again by means of a device 35 and it turns into rolls of suitable tape length for suitable further treatment, in particular application a weather-resistant layer.

In the illustration of the device in FIG. 3, the same reference numerals are used for the same objects. Ää as in Fig. 2. The difference between the two devices is, among other things, that in the device according to FIG. 2, the axes of the two pressure rollers 27 and

2S> 28 lie vertically one above the other, while those in Fig. 3 depicted pressure rollers 27 'and 28' lie horizontally next to one another.

In Fig. 4- is shown schematically how the tape, the according to a device according to FIGS. 2 and 3 treated 1st introduced into a further device 34 will. Here the tapes are first passed through a suitable device out, which is indicated with 37,

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in which a zinc-phosphate conversion of the applied layer is carried out. At 58 an apparatus is schematic indicated, in which a further coating takes place. The tape coated in this way will then cut into suitable lengths by a cutting device 39? and the cut lengths of the coated Products are piled up in stacks 40.

The sheets treated in the manner described above are to a high degree protected against corrosion without

an asphalt or bitumen pavement is required, which is ™ previously known treatment methods to protect the metal sheets was used. The fiberglass mat provides an excellent surface for adhering the weatherproof outer coating.

Examples

Metal sheets of a thickness of 1.5 mm, which are melted with Zinc metal were coated, were covered:

1. with a glass fiber mat made by weaving with ^ 20 16 by 16 threads per cm,

2. with a fiberglass mat made by weaving with 16 times 1? Threads per cm,

J. with a non-uniformly stored coating of Glass fibers 0.25 mm thick, using the following substances as binders:

a) strength,

b) polyester resin,

c) acrylic resin,
d). Epoxy resin.

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In all samples, the fiberglass mat was firmly attached to the melted one Tin layer, with the glass fiber threads partially were embedded within the metal.

"Further" attempts "with regard to phosphating or chromating were made with a none in the rest of the same pattern of metal sheets, which also in the same way were provided with a fiberglass mat. A part of similar patterns was placed in a bath for zinc phosphate conversion others were immersed in a chromating bath dipped, others were not subjected to any post-treatment of this kind. It turned out that detachment The glass fiber mat from the sheet metal is considerably more difficult if a phosphate conversion of the zinc substance is carried out had been. Detaching the fiberglass mat was equally easier, if either at all no post-treatment of the sheet metal or post-treatment in the sense of chromatization had taken place.

External weather-resistant coatings made from alkyd resins and silicone polyesters performed well in all cases Adhesive properties.

Made from disordered fiberglass Glass fiber mat, as shown above as one of the suitable coating agents, represents something fundamentally different from the cut glass fiber, which is often used in the manufacture of glass fiber reinforced Plastic plates are used. Such cut fiberglass mats can be applied to a molten zinc coating applied, but the product obtained represents no protected sheet metal in the sense of the present invention

JO dung.

Patent claims 0 0 98 3 9/1866

Claims (6)

Fat withdrawal With a protective layer consisting essentially of zinc coated steel sheet, characterized by a mat made up of glass fibers, in which the spaces remaining between the glass fibers are evenly distributed and the through Pressing and partially embedding in the protective layer adheres to this. 2. Steel sheet according to claim 1, characterized in that a weather-resistant cover over the glass fiber mat lies. 3. Steel sheet according to claim 1 or 2, characterized in that that the glass fiber mat is a fabric made of glass fibers with a density of 10 to 20 warp threads / cm and one Density is from 10 to 20 wefts / cm. 4. Sheet steel according to claim 1 or 2, characterized in that the mat consists of randomly mounted glass fibers is constructed uniformly. 5. Steel sheet according to claim 1 to 4, characterized in that the glass fibers by a binder in their Are kept. 6. Method of making one with protective layers Coated steel sheet according to one of the preceding claims, characterized by the following process steps: a) on at least one of the two surfaces of the sheet there is one consisting essentially of zinc Protective layer applied in hot molten state j 009839/1866 b) before it cools down, a with evenly distributed interspaces \ ■ see glass fiber mat applied j c) the sheet metal with the still liquid metallic protective layer on it and the applied Glass fiber mat is' passed 'between a pair of pressure rollers in such a way that the glass fiber' ■ matte pressed into the liquid metallic layer, the liquid metal is cooled and with the bedded in it Glass fiber mat solidified into a solid body. 7. The method according to claim 6, characterized in that After the glass fiber mat has been applied, the metallic protective layer is subjected to a zinc-phosphate conversion will. · 009839/1866 Blank page