DE1809971A1 - Method for applying a layer of liquid to metal strips or sheets, in particular method for oiling steel strip, and device for carrying out the method - Google Patents

Description

1803371

File 68-10-198 Dr. HEINZ FEDER _{18 # Mov> 1% 8 WF / Si}

4 Düv .- ^ '- iJo.'f

ii'hj ^ i -7 ·! .Etgr.

The Steel Company of Wales Limited, a British Company, of Abbey Works, Port Talbot, Glamorgan, South Wales

Method for applying a liquid layer to metal strips or sheets, in particular method for oiling steel strip, as well as a device for carrying out the process.

The present invention relates to a method for applying a liquid layer to metal strips or Metal sheets. In particular, the invention relates to a method for oiling steel strip that allows precise adjustment the thickness of the oil layer applied to the surface of the tape before the tape is wound.

It is known after rolling steel plates or strips to oil the surfaces of the plates or belts before they are wound up and delivered to the customer. Included are the thickness of the applied oil layer and the evenness ^ their distribution often with a view to the appropriate

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. aspired to. intended use of the plates or tapes of great Significance »The oiling or application of another protective layer of liquid to the surface of steel belt

so far either done by spraying the surfaces
moving belt through an oil or other

Liquid bath was drawn. When oiling with a The spray or drip process will only apply the oil to one surface of the steel band applied in an amount that corresponds to the hopped up of the final amount required, so that part of the oil layer is transferred to the other surface of the tape after the tape is wound up.

A special problem so far has been the difficulty of obtaining a uniform layer of oil when oiling of the strip took place in a strip mill. The high throughput speeds generally used in strip mills make a coating technique in which a protective liquid is applied to what is passing the rolling mill Tape is applied, unsatisfactory. The coating in the dipping process is an oiling of both surfaces of the tape safe, but control of the thickness of the liquid layer is very difficult and the high throughput speeds of the ligaments usually result in a high loss of oil.

Also the so-called dripping technique, which is often used nowadays is not entirely satisfactory, since it also causes difficulties with it, which is applied to the unit of length of the tape

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To control the amount of oil and also to ensure that the ul is evenly distributed over the entire bandwidth. Furthermore, it is not possible to precisely determine the thickness of the oil layer which is of great importance since tapes intended for different purposes have a different one Require degree of oiling.

For example, in a typical oiling process where the oil is applied to only one side of the belt, heavy surface oiling means a surface layer on the order of 0.81 mg / cm ² (750 mg / ft ² ). Medium oiling is used for surface layers of the order of 0.54 mg / cm ² (500 mg / ft ² ) and slight oiling for surface layers of the order of 0.27 mg / cm (250 mg / ft ² ).

The present invention relates to a method for applying a liquid layer to metal strips or sheets, in particular a method for oiling steel strip, in which the liquid is applied to at least one of the two surfaces a moving metal strip is applied. The disadvantages outlined are avoided in the process according to the invention the metal band after application of the liquid by one or more streams of an inert gas is passed through, which are arranged so that they impinge on at least one of the two surfaces. The order the gas flows can expediently take place in such a way that

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9971

at least one of the gas flows substantially perpendicular to the Surface of the moving metal strip is performed. Furthermore, it has proven to be advantageous to guide the gas flows in this way that at least one of the gas streams has a movement component opposite to the direction of movement of the metal strip.

In a preferred embodiment of the method according to the invention, 4% of the gas stream is generated, ii \ _dem compressed air is passed through a long slot or a nozzle, which is arranged on at least one side of the metal strip in a transverse direction to it that at the point which the tape runs past the slot, forms a gas beam, which extends as a gas knife over the entire width of the tape. In this way it is achieved that, as a result of the gas flow hitting the belt surface, the oil is evenly distributed over the entire width of the belt surface to ensure across the entire width of the tape.

In a further advantageous embodiment of the invention In the process, the liquid is only applied to one side of the metal band and the metal band after Completion of the procedure wound up. So it will be with one Steel band ^ for example only one side oiled. The tape is then wound up in preparation for delivery to the customer or for further use »The oil layer

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on the one hand now serves the other surfaces of the respectively adjacent windings within the steel strip roll to lubricate. In this way, the cracking or corrosion of the steel belt roll is greatly delayed «

Ss are various expedient embodiments of the method according to the invention possible. For example, the liquid can hit the surface of the lethal band with the help one upstream in relation to the gas flows Drip device are applied. But it can also be sprayed onto the surface of the metal strip. ' Farther can the metal strip go through a lüiat nachwalzwerk and so ", then be guided into a liquid bath via a pulley, in which it is held with the help of a fountain roller. In this case, the liquid bath leaving the liquid bath is expediently used Metal band between a pair, facing each other Gas knife lind carried out on the surfaces of the metal strip are directed.

The liquid applied to the metal strip can be oil, whereby Groda oil has proven to be particularly advantageous. It is also useful if the speed of the moving metal strip is in the range between 12.7 and 102 cm / sec. (25 to 200 ft / min.) Particularly in the range between 25.4 and 63.5 cm / sec. (50 to 125 ft / min.).

The angle of the gas meter to the formal, opposite in the direction the direction of movement of the metal strip, can be between 0 and 30 °,

909885/0223

in particular are between 10 and 30 ° »

The width of the nozzle of the gas knife is expediently about 0.13 to 0.64 mm (0.005 "to 0.025"). A width of the nozzle of the gas knife of about 0.38 mm (0.015 ") has proven to be particularly advantageous «,

The gas pressure used is expediently in the range

it ρ «hl ρ .§

between -θγθθ ^ kg / cur to -θγ® & Τ kg / cm (20 to 60 lbs / JJbf). It has proven to be particularly advantageous if the nozzle of the gas meter is at a vertical distance of 3 »2 mm to 15» 9 (1/8 to 5/8 ") from the surface of the metal strip.

The present invention also relates to a device for carrying out the method according to the invention, consisting of a rolling device for producing metal strip, one of this downstream device for applying liquid to at least one of the two surfaces of the Metal tape and a device for winding the treated metal tape on a drum. The device «bee is according to the invention »characterized in that seen in the direction of movement of the metal strip, below the device a device for generating a gas barrier in the form of a gas knife is arranged to apply the liquid, which extends across the surface of the metal strip. The device for generating the gas barrier has more expedient Wise devices for varying the angle of incidence of the gas stream on the surface of the metal strip «,

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A particularly advantageous embodiment of a device to produce a gas meter knows a crazy. essential cylindrical manifold on, with an arcuate one

opening in its forward-facing surface, the fine Storage chamber which is formed from a pair of head plates that extend from the cylindrical surface of the manifold starting out converging in the forward direction and thus one with at least a part of their neighboring edges Form a long slot that represents a nozzle. A pair of converging baffles can be placed inside the manifold be arranged, which run in the longitudinal direction of the manifold and from the rear edges of the arcuate opening extend inward and converge inside the manifold. Furthermore, an intermediate plate starting from the junction of the leche, to be passed through the inside of the distributor pipe at the back and divide it into two chambers. Each of the Provide baffles with a number of holes.

. Furthermore, one of the head plates can be along an outer LäiitTskante have a recess and be bevelled so that it is adapted to an insert part that is so in the recess can be used that the longitudinal edge of the insert part with the longitudinal edge of the adjacent other head plate Forms longitudinal slot. Appropriately, the insert on the head plate is adjustable so that the width of the the longitudinal slot forming the nozzle is adjustable. The ends

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of the distribution pipe can through. End plates closed that both the manifold and the storage chamber complete, with a coaxial su dem at each end plate cylindrical distributor pipe lying more protruding outwards pierced shaft is arranged, the inside connected to the manifold and outside with a device for Connection of a compressed air source is provided »The shafts are expediently held in bearings that have a locking device exhibit"

That which is used in the method according to the invention Inert gas can be any gas that can be used in the device and that is both in terms of the liquid used, 'as well as with regard to the metal strips to be produced has no undesirable properties under the prevailing processing conditions for economic reasons air can be used, but different ßase such as carbon dioxide or nitrogen can also be used be used.

In the following, exemplary embodiments of the method according to the invention, as well as an exemplary embodiment for a device to carry out the method, are explained in more detail with reference to the accompanying figures. Furthermore, the advantages of the method according to the invention are described in more detail with the aid of some measurement results.

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Figures I to 4- show various in a schematic representation Embodiments of the method according to the invention.

Figure 5 is a longitudinal section through a device for implementation of the method according to the invention.

FIG. 6 is a front view of the device according to FIG. 5. FIG. 7 shows an individual part of the device in front view according to FIGS. 5 and 6.

FIG. 8 shows the device according to FIGS. 5 to 7 in perspective. FIGS. 9 to 11 show in FIG graphical representation of the dependence of the liquid layer thickness on the various parameters of the process and the device.

In the arrangement shown in FIG. 1, a strip 10 leaving the cold re-rolling mill 11 is placed on its upper strip Surface 13 with the aid of a spray device 14 with oil 12 Mistake. The device for producing a gas meter 15 has an elongated slot 16 which forms a nozzle and extends transversely to the belt IO and perpendicular to the direction of movement of the Tape 10 extends in the direction of the winder 17 over the entire width of the tape. The device 15 is with a Compressed air source connected and arranged so that a jet or curtain of compressed air down onto the surface of the belt 10 is directed, the nozzle 15 against the surface of the « Belt 10 is inclined at such an angle that a component of the gas flow is parallel to the upper surface 13

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■ - 10 -

of the belt in one direction opposite to the direction of movement of the belt 10 runs. That generated by the device 15 The gas meter is used to measure the thickness of the oil layer on the top surface of the tape that is on the winder to "moved to adjust precisely, in the" the excess of oil removed.

It was found that the thickness of the oil layer on the Surface of the belt by varying the pressure of the compressed air emerging from the nozzle 16 of the gas knife 15, as well as by changing the distance between the nozzle 16 and the surface of the belt 10 and the angle at which the gas ™ and air flow, respectively strikes the surface of the belt 10, controlled can be. When the tape is wound, it becomes a part the oil layer from the upper surface 13 of the belt 10 to the underside of the adjacent winding in the steel belt roll transfer.

Figure 2 shows an arrangement in which the belt 10 after Leaving the cold rolling mill 11 runs over a deflection roll and enters an oil bath 19, where it is through a Dew roller 20 is immersed in the liquid. If that Band 10 leaves the oil bath 19, it is provided on each of the two surfaces with a layer of oil and is between one Pair of gas knives 15 passed therethrough, each pointing to one of the surfaces of the belt in the above-described Kind is directed. In this way, each of the two surfaces becomes of the band 10 provided with a layer of oil, and the

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Thicknesses of these two oil layers can be determined with the help of the gas meter 15 can be set independently of each other.

In the arrangement shown in FIG. 3, the strip 10 emerging from the cold pass rolling mill 11 initially runs over a first deflection roller 23 through the e3 in one opposite the normal direction of movement of the belt downward direction of movement is deflected. From the first deflection roller coming from the tape IO is guided along the underside of a second deflection roller 21, from which it is upwards a ^ u.fwickelvorrichtung 17 is running. Subsequent to second deflection roller 21, a drip device 22 is provided, which is arranged transversely to the belt 10 and extends over his full width and with the help of which the oil on the upper surface 13 of the tape is dripped. The gas knife device 15, the slot-shaped nozzle 16 of which extends over extending the full width of the belt is inclined against the surface 13 of the belt 10 at such an angle that the air curtain or air jet emanating from the nozzle 16 hits the belt / t at an angle of approx. 45 °, so that a component of the air jet parallel to and opposite to the belt its direction of movement. As already described for the other arrangements, the thickness of the applied to the surface 13 by the drip device 22 Oil layer can be controlled with the aid of gas meter 15, in which the excess oil is removed by the gas knife 15.

- 12 -

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The thickness of the oil layer is also adjusted » by changing the pressure of the compressed air emerging from the nozzle 16, as well as by changing the distance "of the nozzle from / w Surface of the. Belt and the angle "at which the air flow hits the surface.

In the arrangement shown in FIG. 4, the belt 10 after leaving the Kaltnachwalzwerlces 11 over a first deflection roller 30 down into an oil bath 19, where it goes through the dip roller 20 is held in the liquid and then runs upwards out of the oil bath * over a second deflection roller 31 and from there to the take-up device 1? » The gas meters 15 are on both sides of the belt 10 between the fountain roller 20 and the aweit deflection roller $ 1 arranged. The arrangement is such that the gas meter 15 a small angle with the vertical ^, on the direction of movement of the belt 10 between the immersion drum 20 wheel of the second deflection roller 31 insert. The thickness of the oil sight on the two surfaces of the belt 10 is adjusted with the aid of the gas meter 15 in the manner already described »

An embodiment of a gas measuring device according to FIG The invention is "in the following with reference to Figures 5" to -8 described.

The device 40 shown in these figures is ordered from a substantially cylindrical distributor 41, which on its front surface with an arch-shaped,

. 909885/0223 _ ₁₅ "

opening 42 extending essentially over the length of the cylinder 41 is provided. The opening 42 is delimited by a pair of parallel edges 43 of the wall of the cylinder 41. Running inward and backward from the edges 43 of the cylinder 41, baffles 45 are arranged which are at an angle of approx converge and collide at a point behind the opening 42 in the interior of the cylinder 41. These guide plates 45 consist of elongated rectangular plates which are welded together at their rear ends and which are connected by welding at their front edges to the rear end of the edges 43 of the opening. Each of these inclined baffles 45 is provided with a series of holes 46 which serve to connect the interior of the manifold 41 to the opening 42. Each of the baffles 45 is connected to an intermediate plate 48 which, starting from the connection point, extends rearwardly across the interior of the cylinder 41 and is connected to the rear inner surface of the cylinder by welding. The intermediate plate 48 serves to divide the manifold 41 into an upper chamber & fW and a lower chamber 68, each of which is delimited by the curved inner surface of the cylinder 41, the intermediate plate 48 and one of the baffles 45.

The outer surface of the cylinder 41 is cut in two places.

at
flats for adjustmentVein pair of head plates 50 and 51, of

which each 4n at its rear end by means of screws 52 at dtm

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"flattened part of the cylinder 41" is attached «, the flattened Parts are arranged on the cylinder 41 so that the head plates 50 and 51 converge in the forward direction Strike and one of the head plates 50 encloses a smaller angle with the intermediate plate 48 than the other Headstock 51.

The ends of the cylinder 41 are closed with the help of end pieces 55 which are inserted into a step-shaped recess 56 of the engage the inner end edge of the manifold 41. The end pieces 55 are connected to a shaft 57 on their outside which has a central bore 58. The shaft 57 is arranged coaxially to the cylinder 41 and is used for holding of the device producing the gas meter. To that end is each shaft held in a bearing, not shown, which has a locking device, also not shown, whereby the angular position of the gas knife device with respect to the surface of the belt can be varied and fixed can. Via the bore 58 of the shaft 57, the interior of the Device can be connected to a compressed air source.

The guide plates 45 and the intermediate plate 48 have a baffle plate 59 at each end that is essentially perpendicular to the is arranged by the two plates 45 and 48 defined planes and connected to these plates by welding is. A first baffle plate 59 is in its lower area provided with a number of openings 70 through which the air flows into the lower chamber 68, while the wide impact

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plate 59 "at the other end of plates 45 and 48 with similar Openings 70 is provided in its upper region, through which the air can flow into the upper chamber 77.

The upper head plate 50 is on its outer longitudinal edge 72 provided with a recess 60. The edge 73 of this recess 60 is beveled so that the outer surface of the Plate has a downward and forward sloping surface 61 within the recess. This inclined surface 61 is provided with four small screw holes 74- to accommodate Adjusting screws. An Eitffcatzteil 67 can be inserted into the recess 60 of the upper head plate, the four of which are attached to the threaded bores 74 has adapted slots 75. The outer longitudinal edge of the insert part 67 is formed so that it together with the longitudinal edge of the head plate 51 a long slot or a nozzle 53 forms which extends over the length of the recess 60 of the head plate 50. The insert parts can be adjusted to the extent specified by the elongated holes 75, whereby the width of the nozzle can be adjusted.

Each of the baffle plates 59 and 59 * is one forward directed part -6% provided, which is designed so that he through the opening 42 in the distributor pipe 41 into the through the two top plates 50 and 51 formed storage chamber extends into it and divides it so that it connects to the recess 60 in the head plate 50 and to the baffle plates 59 and 59 'is adapted and that of those designated 65 and 66

Places adapted to the curved end parts of the cylinder 41

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To start up the device 40 with the shafts 5 ¹ ? inserted into the bearings equipped with the S'est setting device »* A screw ^! 'Or another control device can be provided. The screws with which the insert 67 is attached to the head plate 50 are loosened and the insert is adjusted so that a nozzle opening 53 of the desired width is created at the end of the storage chamber. dressed again.

The bearings carrying the shafts 57 are adjusted with respect to the strip to be processed so that the nozzle opening 535 is arranged at the desired distance from the strip and at the desired angle to the strip. and compressed air of a certain pressure is introduced into the manifold 51. The air enters the device through the bore 58 in the shafts 37 and initially into the space between the end plates 55 and the baffle plates and 59 'within the cylinder 41. The Air then flows through the openings 70 of the baffle plates 59 and 59 'and enters the lower chamber 68 and the upper chamber 77. From these two chambers, the air flows through the holes 46 in the baffles 45 into the storage chamber through the top plates 50 and 51 and then from the nozzle slot $ 5 formed by the lower edge of the plate 51 and the outer edge of the adjustable insert 67 det is and from there onto the tape.

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18D9971

In the following, measurement results are described using examples, which point out the advantages of the present invention even more clearly and show to what extent a mastery of the adjustment of the thickness of the oil layer applied to the tape with the aid of the invention Proceeding is possible. In the experiments described in the following examples, a gas knife device was used, as has been described above with reference to FIGS. 5 to 8 and the general arrangement of the device corresponds to the arrangement described with reference to FIG.

Examples 1 to 4

These examples show the results of experiments that were made to show the effect of the belt speed at different compressed air pressures on the oil content, which can be measured on the surface of the steel strip. The oil used was Croda Oil G.P. 4? 8 and the perpendicular distance of the gas knife from the tape was about 3 »2 mm (1/8"). The slot width of the gas knife was about 0.38 mm (0.015 ") and the angle of the gas knife to the vertical in the direction against the movement of the belt was 20 °. Both the belt speed and the compressed air pressure were varied during the tests. The results are in Table 1 compiled.

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Table 1 Air pressure
(kg / cmr) 1809971 Oil thickness
Cmg / enF) 0.664 0.7 • 0.652
0.483 1.662
0.883 Belt speed
speed (cm / sec) 2.1 0.425 2.1 0.758 12.7 2.8 0.419 2.8 j 0.835 example 1 3.5 0.420 0.7 0.830
0.579 2.1 0.530 25.4 2.8 0.436 Example 2 3.5 o, 7 3.5! 0.801
! · .1 I.
From the table above it can be seen that as the pressure of the compressed air increases, the weight of the oil on the 50.8 Surface decreases. FIG. 9 shows in a graphic representation Example 3 position the effect of the air pressure on the oil weight and it is clear that for a given belt speed
909885/0223 \ _B _ 63.5 Example 4 0.439
1 1.038 1.4 \ 0.792 2.1 0.727 2.8 0.7
1.4 I.

an increase in air pressure, a reduction in the air pressure results in until an optimal oil weight value for a given air pressure and a given belt speed is reached. For a fixed air pressure, the oil weight increases with increasing belt speed.

Examples 5 to 9

In Examples 5 to 9 test results are shown, showing the effect of the viscosity of the ules at different Show air pressure. During these experiments the belt speed was 50.8 cm / BBC. (100 ft / min) and the vertical The distance between the gas knife and the tape was approx. 3.2 mm (1/8 "). The slot of the gas knife nozzle was approx. 0.38 mm (0.015") and the angle of the gas knife to the vertical in seal against the strip movement was 20 °. The viscosity of the Üles was changed in the percentage of white spirit that the Groda-Öl G.P. 478 was added, was varied. The results are compiled in Table 2.

ZO

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Example 5 Air pressure
(kg / cm2) Table 2 viscosity
of the oil -
JTordviskosi
meter (sec) \ 0.7 39 Oil film weight
(mg / cm ² ) Oil mixture 16.2 1.038 Example 6 Croda Oil GP478
without a solution
middle 15.4 0.461 1.4 3 parts Groda-
Oil / in part
White spirit 1 39 0.425 two parts of Croda-
Oil in part
White spirit 17.8 0.792 Croda Oil GP478
without solvent 16 * 2 0.435 Example? four parts of Croda
Oil against a part
White spirit 15.4 0.363 - 2.1 three parts of Croda
Oil against a part
White spirit 39 0.292 two parts of Croda
Oil against a part
White spirit 16.2 0.727 roda oil GP478
without solvent 15.4 O ₁ 313 three parts of Croda-
1 against a part
estbenzin 0.279 two parts of Croda
1 against a part
Test petrol • 90988S / 0223

Continuation! Table 2

3example 8

2.8

Oroda-Ül Ü.P. 478 without solvent

four parts Croda oil against one part white spirit

three parts of croda oil against one part White spirit

two parts of croda oil against one part White spirit

17.8 16.2 15.4-

0.664

, 386 O, , 315 O, 292 O, 656 O, 376 O, 314 281

example 9

3.5

Croda-Öl G.P.478 without solvent

four parts of Croda-Ul against one part of white spirit

three parts of Groda oil against one part of white spirit

two parts oroda oil against one part white spirit

39

17.8 16.2

FIG. 10 shows a graphic representation of the dependency the gross weight in milligrams per square centimeter (or per square foot) of the surface from the air pressure in kilograms per square centimeter (or pound per square inch). From these The results show that a decrease in the viscosity of the oil under otherwise changed conditions has a corresponding effect ! results in lower oil weight on the belt.

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Examples IO b is

These examples illustrate the effect of the vertical distance of the gas meter from the steel belt at different air pressures on the amount of oil that can be measured on the surface of the steel belt. In this experiments, the tape speed 5O _1/8 cm was secj the "oil used was again Oroda oil GP ₀ 478 and the slit of the gas knife had a width of 0 ^ 38 mm (0.015"). " The angle of the gas meter to the vertical against the direction of movement of the tape was 20 °. The results are summarized in.! Table 3 _&

Tabel

Air pressure

Distance (mm)

(mg / cnir

ews

Example 10

2.1

3.2

9.6

15 ₈ 9

O ₈ 72? 1.148 1.460

11th

2.8

Example 12j

3.5

3.2

9.6

15.9

3-

15 s 9

O j 664 O ₉ 986 I ₃ 345

O I ₅₅₉₅ 0.902 ₈₂₉₅

ΊΑ

Figure 11 is a graph showing the oil weight in milligrams per square centimeter (or per square foot) of the surface as a function of the vertical distance of the gas knife from the tape in millimeters (or inches) is. It can be seen from this that in one

given air pressure is the oil weight of the layer per unit area the surface is directly proportional to the perpendicular distance of the gas knife from the strip surface.

Examples 13-15

These examples illustrate the effect of changing the Angle that the gas meter has in one direction with the vertical against the direction of tape movement includes, at different air pressures, on the proportion of the on the surface oil filjrfmes deposited on the steel strip. at In these experiments the belt speed was 50.8 cm / sec, the oil used was Groda-Öl G.P. 478 and the vertical Distance of gas meter from tape was $ # 3 ^ 2 mm (1/8 ") · The width of the nozzle slot of the gas knife was 0.38 mm (0.015 "). The results are shown in Table 4.

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Table 4

Air pressure
'(Kg / cm ² ) Angle of gas
knife oil film weight
(mg / cm2) Example 13 2.1 0 °
10 °
20 °
30 ° 0.948
0.776
0.622
0.587 Example 14 2.8 O O O O
O O O O
H CM KN 0.826
0.692
0.585
0.522 Example 15 3.5 0 °
10 °
20 °
30 ° 0.788
0 _d 653
0.595
0 "588

From this it can be seen, that by changing the angle of the Gas knife against the vertical in such a way that a component of the gas flow in a direction opposite to the direction of movement the tape runs, there is a good possibility; affecting that oil weight on the surface of the belt »

Examples 1 6 "to , 18

In these examples, the effect of a change is the Slit width of the gas meter "at different air pressures The proportion of the oil measured on the surface of the steel tape ©usters was shown. In these tests, the oil used was

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809971 (1/8 ") and the . Of the t Table 5 Slot width • • ^} ' mm Band speed was 50.8 cm / sec (100 ft / min) in that direction ι (mm) Oil film weight , 627 angle m V
again Croda-Öl GP 478, the vertical distance of the gas of the gas meter against the vertical the direction of movement of the tape was again 20 ° Air pressure 0.13 (mg / cm ² , 663 opposite knife of the tape was 3.2 mm The results are shown in Table 5 i
! Example 18 (kg / cm ² ) 0.25 0 , 706 . the 2.1 0.38 0 , 668 1 0.51 0 , 704 0.64 O ₁ 585 0.13 O, 640 Example 16 0.25 O, 659 2.8 0.38 O ₁ 643 0.51 O, 679 0.6 * O, 545 0.13 O, 593 Example 17 0.25 O, 659 3.5 0.38 O, 656 0.51 O, 669 0.64 O, 909885/0223 O,

From the foregoing it can be seen that "with a Change the parameters of the gas meter device precise control of the thickness of the oil film remaining on the steel strip can be achieved. This is of great practicality Meaning, because this makes it possible to create an oil layer of a certain thickness and uniform thickness depending on the intended use to apply to the steel strip. The possibility is also of interest for special purposes, for example by progressively increasing the distance between the gas knife nozzle slot 53 from the surface of the belt a progressive change in the oil thickness on the belt achieve.

Patent entitlements

Claims (1)

Patent claims 1. A method for applying a liquid layer to metal strips or sheets, in particular a method for oiling steel strip, in which the liquid is applied to at least one of the two surfaces of a moving metal strip, characterized in that the metal strip after application of the liquid by one or a plurality of streams of an inert gas is passed, which are arranged so that they impinge on at least one of the two surfaces. 2. The method according to claim 1, characterized in that at least one of the gas streams is guided substantially perpendicular to the surface of the moving Lietallband. 3. The method according to claim 1, characterized in that at least one of the gas flows has a movement component against the direction of movement of the metal strip » _R 4, Method according to one of claims 1 to 3 »characterized in that each gas stream is produced in the compressed air through a nozzle is passed through a long slot or that a" side of the Jvletallbandes is arranged transversely to it on at least that A gas barrier forms at the point where the tape runs past the slot, which extends as a gas knife over the entire width of the tape. - 2 * 8- 909885/0223 5. The method according to any one of claims 1 to 4, characterized in that the liquid is applied only to one side of the metal strip and the metal strip is wound up after completion of the process. > r 6. The method according to any one of claims 1 to 5 » characterized in that the liquid is applied to the surface of the metal strip with the aid of a drip device arranged upstream in relation to the Gasst'röme». 7. The method according to any one of claims 1 to 5 » characterized in that the liquid is sprayed onto the surface of the metal strip. 8. The method according to any one of claims 1 to 5 » characterized in that the metal strip is passed through a cold pass rolling mill and then .over a deflection roller into a liquid bath, in which it is held with the aid of a dip roller. 9. The method according to claim 8, characterized in that the metal strip leaving the liquid bath is passed between a pair of opposing gas knives which are directed towards the surfaces of the metal strip. 90988S / 0223 10. The method according to any one of claims 1 "to 9, characterized in that the liquid applied is oil, in particular Croda oil. 11. The method according to any one of claims 1 to 10, characterized . that the speed of the moving metal strip is in the range between 12.7 and 102 cm / sec} .iegt. 12. The method according to claim 11, characterized in that «the speed of the moving metal strip is in the range between 25.4 and 63.5 cm / sec. 13. The method according to any one of claims 4 to 12, characterized in that the angle of the gas knife nozzle to the normal in sighting against the direction of movement of the metal strip is between 0 ° and 30 °. 14. The method according to claim ^, characterized in that « that the angle of the gas knife nozzle to the normal in the direction opposite to the direction of movement of the tape between and 30 °. 15. The method according to any one of claims 4 to 14, characterized «that the width of the nozzle of the gas knife is approximately 0.13 mm to 0.64 mm. 16. The method according to claim 15, characterized in that the width of the nozzle of the gas knife is approximately 0.33 µm. 809886/0223 - 39 - 17. Process according to one of Claims 1 to 16, characterized in that the gas pressure is in the range between 1.4 kg / cm ² to 4.2 kg / cm ² . 18. The method according to any one of claims 1 to 17, _{characterized%} that the nozzle of the gas knife at a perpendicular distance of 3.18 mm to 15 »9 w®- from the surface of the metal strip has. Device for carrying out the method according to claims 1 to 18, consisting of a rolling device for producing metal strip, a device downstream of this for applying liquid to at least one of the two surfaces of the metal strip and a device for winding the treated metal strip onto one Eolle, characterized in that seen in the direction of movement of the metal strip, a device for generating a gas barrier in the form of a gas knife is arranged below the device for applying the liquid, which is arranged across the upper i surface of the metal band extends. 20 "Device according to claim 19" characterized. " that the device for generating the G-asharriere facilities »To vary the angle of incidence of the gas flow on the surface of the MetaliTband» 909085/0223 ' ^ 21. The device according to claim 19 or 20, characterized in that the device for producing a gas knife comprises a substantially cylindrical distributor pipe (41) with an arcuate opening (42) in its forward direction in
facing surface which opens into a storage chamber, which is formed from a pair of head plates (50,51) which, starting from the cylindrical surface of the distributor pipe (41), converge 'in the forward direction' and thus form a long schiitζ ( 53), which represents a nozzle. 22. The device according to claim 21, characterized in that a pair of converging guide plates (45) are arranged within the distributor pipe (41), which run in the longitudinal direction of the distributor pipe and extend inwardly from the rear edges (43) of the arcuate opening (42) extend and converge inside the manifold (41). 2Y. Device according to claim 22, characterized in that an intermediate plate (48) is guided from the junction of the guide bays (45) to the rear across the interior of the distributor pipe (41) and divides it into two chambers (68, 77). - 312- 809885/0223 24. Device according to claims 22 or 23, characterized in that each of the guide plates (45) with a Number of holes (46) is provided. 25. Device according to one of claims 21 to 24, characterized in that one of the head plates (50) has a recess (60) along an outer longitudinal edge, and is beveled so that it is adapted to an insert part (67) which can be inserted into the recess in such a way that the longitudinal edge of the insert part (67) forms the longitudinal slot (53) with the longitudinal edge of the other adjacent head plate (51). 26. The device according to claim 25, characterized in that « that the insert (67) on the head plate (50) is adjustable so that the width of the forming the nozzle Longitudinal slide (53) is adjustable. 27. Device according to one of claims 21 to 26, characterized in that the ends of the distributor pipe (41) are closed by end plates (55) which close off both the distributor pipe (41) and the storage chamber, with each end plate (55) © is arranged in an outwardly projecting pierced shaft (57) which is coaxial with the cylindrical distributor pipe (41) and which is connected to the inside with the is
Manifold connected / and outside with a Einriiicöimg aum Connection of a compressed air source is provided 909886/0223 ''33 28. Device according to. Jpspruch 27 » characterized in that the shafts (57) are held in bearings which have a locking device. 909888/0223