DE2362383A1 - DEVICE FOR THE PRODUCTION OF GLASS FEMS - Google Patents

Description

23G2383 .:

PATENT LAWYERS Dipi.-ing. H. Seiler Dipi.-ing. J. Pfenning Dipi.-Phys. KH Meinig

4163-B ^ ' 1 Berlin 1

- ■ Oldenburgallee 1O

Tel. 030/304 55 21/22

: Wireword: safety patent

Postal checking account :. Berlin-West SO 38-1O2

• December 12, 1973

Pf / Sehu

Johns-Manville Corporation 22 Bast 4OtJi Street, Hew York, H. X. 10016 "USA

Device for the production of glass threads

The invention relates to a device for the production of glass thread, which consists of a drawing pan with a drawing nozzles in a row-containing arrangement : Bottom wall, whereby the glass emerging from the drawing nozzles

! currents are warped by stretching in glass threads.

Glass threads are made by melting streams Glass consisting of a multitude of small nozzles or openings

genes, which are arranged in a bottom wall of a drawing pan,

to emerge, to be drawn into endless paths. The melted one At the outlet end of the nozzles, glass forms so-called pots. j

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Since the glass threads are continuously stretched from the tubs

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are pulled out, these parisons have the cross-section a downward cone. In this known method, the pad diameter and the output of the glass thread affected by the viscosity of the glass making up the parisons and the change in viscosity of the glass in each Parcel between its base and its apex, the more uniform the viscosity of the parison and the more uniform it is the change in viscosity in the individual parisons, the more more even thread diameter and the greater the output can be achieved

While the viscosity of the glass and the change in viscosity from the base up to the apex of the parison are directly related to the glass transition temperature, the quality of the threads with regard to a uniform diameter and the production speed depend to a large extent on the temperatures of the nozzles and the the nozzles created by the glass bulb. The more uniform the temperatures and the temperature changes, the more uniform the diameter of the individual threads and the higher the product one rate is given for a specific thread diameter.

When the cone formed on the nozzle is tapered look downwards The parcel is subject to an excessively high temperature,

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the viscosity of the parison becomes to such an extent reduces the fact that the molten glass of the parison does not wear the continuously peeled off, hanging u-glass thread can so that the threads break off. This state is called Incorrect formation or burning denotes * The deviation between the burning down of the nozzles and the one for one maximum productivity required operating temperature · '· ■ is subject to empirical determination during the operation of the drawing pan, and errors here lead to failures or to unequal · -Thread diameters * There must be a sufficient distance exist between the burning temperature and the actual Operating temperature of the drawing cup to compensate for changes in viscosity caused by changes in the Homogeneity of the. Glass due to uncontrolled changes in the Nozzle temperature due to slight discontinuity in dei? Control of the drawing pan, through the shape of the nozzles or through other factors affecting the temperature of the drawing pan can flow.

in practice, drawing flags have a large number of "nozzle" for example 400, 800, 1600 or 24üO. Me maximum Söhmelz * - rate or productivity that can be achieved * depends from the hottest nozzle or the hottest group of the respective drawing pan "and the temperature of the nozzles must be so '

can be controlled so that they are below the burning temperature lies. Other nozzles that are not so hot have temperatures which are further away from the optimal temperature, the amount of temperature difference between the nozzle determines how far from the optimal temperature the nozzles work. So that the drawing pan is flawless works, the temperature of the coldest nozzles in the outer row of nozzles must exceed a certain value, or because the nozzles are too cold on the outside Continuous undressing interrupted. The nozzle temperature among all nozzles must fall within a certain range in order for the glass viscosity to remain suitable for continuous drawing of the i'ä & s. When the temperature change is too large, either the hotter nozzles will burn off and / or the colder nozzles will result Illustration result in an interruption. Even if not Given these above conditions, the drawing pan will not be operated at its optimal output can if the temperature differences are large enough. While some nozzles at a sufficient distance from the Burning temperature work at maximum production, with other nozzles with a lower temperature there will be a significantly lower glass flow from the nozzles without this an interruption needs to occur.

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Therefore it is desirable to have the different nozzles on to keep a constant temperature »with it all Nozzles can work as close as possible to the burn-off temperature to ensure a steady output at a more even rate Ensure thread quality.

The temperature in a cone can fall between the base at the nozzle orifice and the apex at ca, 73Q ^P O. The outer rows of nozzles are exposed to the relatively cool ambient atmosphere. In addition, the fast moving threads, for example in a number from 800 to 1600 at a speed of * 2QG0m / Miit, “act as an air pump, which leads the ambient air onto the surface of the outer nozzles and cools them excessively. The inner nozzles, on the other hand, receive radiant heat from the neighboring nozzles, and the thermal effect of the air currents generated by the pulled threads is very different with these inner nozzles compared to the outer rows of nozzles. Therefore, the temperature drop in the glass bowls of the inner and outer row of nozzles can differ by more than 38 ° G.

Another factor that makes it difficult to maintain a constant temperature in the many glass pots is the poor heat balance of the melted (Jlases in

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different. Altitudes in the drawing pan itself. This applies in particular to altitudes close to the bottom of the drawing pan. The equality of the temperature in the drawing pan is so far not uniform or planar. The greater part of the heat in the molten glass goblets comes from the molten glass in the drawing pan. Therefore, if the glass temperature in the drawing pan above the nozzles is not uniform, the temperature of the glass in the nozzles will not be uniform. When developing sieving pans, an essential goal is to maintain a uniform temperature in the lower elevations of the glass melt in the drawing pan. It is clear that one of the main requirements in the construction of drawing pans which are either charged with a melt, or in which a melt is produced, is to maintain a temperature profile above the nozzle field which is as uniform as possible. This is a prerequisite for achieving maximum productivity or working speed. This is also necessary if the best possible thread quality is to be obtained, since the uniformity of the thread diameter, which is an essential prerequisite for many products, depends on the maintenance of an equal glass flow through each of these, which in turn depends to a large extent from maintaining

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an even temperature between the nozzles. ■

In order to increase the yield of glass fibers, it has been found to be shown necessary to provide external cooling devices, which are close to the nozzles of the drawing pan, to prevent the internal nozzles from overheating Protect «For this purpose, cooling water pipes are generally used or strong massive heat-conducting ribs are used, which are usually on one with an outside of the nozzle field Side of the drawing pan are connected. The tubes or fins are generally between Pairs of rows of nozzles arranged, each pair of rows of nozzles is spaced from the adjacent pairs of rows of nozzles. ■ '.

Increases in the resulting fan "-like angle by the withdrawn threads lead to greater differences in the pulling forces between the threads that are drawn off by the inner and outer rows of nozzles. To get out of the rows of nozzles

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To remove filaments of uniform diameter, therefore, this fan-shaped angle must be as possible as small _f.

The invention is based on the object, an adjacent one arranged on the outside of the nozzles of the drawing pan

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Thermal diving device to create a better one Guaranteed temperature equalization between the various nozzles and the glass tubs formed on them.

This object is achieved in that the Receipt of cooling tubes below and adjacent to the bottom wall of the drawing pan and between at least some rows of nozzles Serving supports are provided, and that at least some of the cooling tubes at least one longitudinal, of wear wings extending from their surface and arranged in a plane perpendicular to the bottom wall.

Further features emerge from the subclaims.

The accompanying drawings show examples of embodiment of the device, and it means

Fig. 1 cross section through a drawing pan, the fiction proper cooling device and a device for pulling out the glass thread,

Fig. 2 longitudinal section of the drawing pan and the cooling device according to Mg. 1 on an enlarged scale,

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Pig. 3 Partial section through the nozzle field and 'the cooling pipe arrangement,

4 side view of a cooling tube "according to FIG. 2,

whose wing extends over the entire ■ extend the length of the nozzle field,

Fig. 5 ⁷ - -

Up to 9 cooling pipes of different cross-sections with mounds arranged on them.

The Ji'ig. 1 shows a drawing device 18 and the heat exchange device according to the invention in the production of glass thread, which is collected into a strand and wound on a winding device. A pulling pan 20 of the pulling device 18 is either connected to a source of liquid glass, for example the hearth of a melting furnace, or the molten glass is produced from raw material in the pulling pan in an amount corresponding to that which is withdrawn from the pulling pan ¹ . A bottom or nozzle wall 22 of the drawing pan 20 ″ is provided with rows of nozzles or projections 24 directed from the found 22 naeli below and arranged in paired rows extending from

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adjacent pairs of rows, a slightly larger one Distance are separated. The glass withdrawn from the drawing pan 20 penetrates the openings 26 of the nozzles 24 and forms cone-like glass bowls 28 directed downwards at the nozzle ends. The glass is drawn off from these bowls and warped in threads 30 by stretching. The weed 30 can from e-i-ner application device 32 with a Schlichtegdttel are provided »whereupon they are combined in a collecting roll 34 to form a strand 36, which is formed into a coil 38 by means of a conventional winding device 40 is wound up.

The heat exchange device 42 is under the bottom wall. 22nd arranged in the vicinity of the rows of nozzles 24. The purpose of the heat exchange device 42 is to detect temperature differences between the different nozzles and decrease. in the rows of nozzles the temperature of the nozzles is more even to keep. This ensures that the temperature and the viscosity of the glass forming the parison 28 on the Ends of the nozzles 24 is more uniform over the entire nozzle field. In addition, the heat exchange device ensures a uniform temperature change in the pots 28 over the entire nozzle field. Because the temperature at the base of the Külbel 28 and the temperature change from the base Idxs to the

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The apex of the parison is more uniform, so is the viscosity at the base of the vial and the viscosity change over the parison is more even, and therefore the fibers formed from the various nozzles are more even in their! temperature, so that a deviation from the desired The thread diameter is kept as small as possible

The drawing pan 20 is approximately 15 to 20 cm wide with a length of 45 to. 60 cm and a height of 15 to 25 cm. The drawing pan 20 is received in a frame 44 which is separated from the drawing pan 20 by the insulation 46 in order to prevent a heat transfer from the drawing pan to the frame 46. The drawing pan is generally arranged in the frame so that the nozzle array of the drawing pan is flush with the bottom of the frame. In the case of the drawing pan 20 according to the invention equipped with the heat exchange device 42, the nozzle field jumps back into the frame by approximately 0.6 cm. In this embodiment, the insulation of the sides of the frame reflects the heat back to the outer rows of nozzles 48 and partially shields the outer rows of nozzles from the cool air currents that result from the threads 30 as they are pulled off the nozzles 24. This measure thus contributes to the equalization of the temperatures between the outer rows of nozzles 48 and the inner rows of nozzles 50, since they

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serves the temperature of the outer .Düsenreihen opposite to increase the inner rows of nozzles.

The heat equalization device 42 consists of cooling tubes 52, those with wings sina and from cooling tubes 54 without jj'lugtjl. * The cooling tubes extend in the longitudinal direction of the drawing pan -20 and are connected on both sides with xi tubes 56, dxe an inlet and an outlet of vvasser or one darsxellen other coolant that is passed through the cooling tubes 52 and 54. Each cooling tube has one Middle part 58, which is parallel to the lower surface of the -üodenwana 22 extends the entire length »at each end of the Draw pan 20, portions 60 of the cooling tubes extend from the Middle part downwards at an angle of approximately 45 ° to the tubes 56. At each jinde of the drawing pan 20 are support rods 62 received on arms 64 which are attached to each üinde of the draw pan. The cooling pipes 52, - 54 are on the support rods 62, which are below the cooling pipes to the Ends of their central part 58 run. The poor. 64 are accommodated on bolts 66 which, for example, are welded through are connected to the frame 54 and reach through the arms 64 hindurcjfi-. By tightening or loosening the nuts 68 of the bolts 66, the vertical distance between the cooling tubes and

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be set to the Bü & enfeld ..

Since the design of the cooling tubes §2,!? 4 and the drag rods 62 at each end of the drawing hearth 2Q is identical, the air currents caused by the removal of the glass thread 3Q are also the same at both ends of the drawing pan. Temperature differences between the ends of the drawing pan, a hot jn, the U "8a a relatively cool end avoided, which lead to unequal air currents in the case of different types of tubes at the ends of the drawing chamber. In some of the earlier cooling devices the question was he ung gleißh at one end of Kühlvprrieht However, the now used _p em the other end was positioned 2! räger and Was§errüeklawf · Vyodwreh the Luftströmi were .abgeriegelt and served the ropes 4§r cooler gis .Hitzerefl, reflectors, I) a.through _? 4ass the cooling tubes and the supports of the second hand at each end of the drawing pan are identical to one another, i.e., in the middle of the drawing pan, the mode of action of the drawing is shown ^ pan for example mft V? i * increased, and ejs igt eifle better

Me xiöhre are in. Parällelg AMSriöhtiAag M d # n M 48, i? Q · and Üer Jödenwand'M · by lihjpungiglieder ^ 70 fehalten.

Each guide link extends across the width of the drawing

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pan and serves-aucii to support the bottom wall 22 of the Drawing pan. The tube currents 70 are on, for example attached to each end of the acetabular cup receiving frame 44 and are isolated from the nozzle plate 22 by a non-conductive refractory means 22 for heat conduction from the outer plate to every pipe run One of the pipe guides 70 is below the center of the nozzle plate 22, while the other two pipe guides are below it of the ends of the nozzle plate so that it is supported in its center and on the j_aden. The pipe guide en 70 have slots 74, which in their i'orm the outer circumference of the Correspond to cooling tubes. The tubes 52, 54 are in these Slots 74 are arranged so that the cooling tubes are held in precise alignment with the rows of nozzles and the nozzle plate are.

The length of a nozzle from the bottom of the nozzle plate 22 to to their iaide is generally between 5.5 and 4.5 mm, and the outside diameter of a nozzle at its lower inde is approximately 2.2mm, while a pair of rows of nozzles are closer together, the distance "X" between them is Center lines of adjacent nozzles of two rows of nozzles approximately 10 mm, the distance between adjacent surfaces of these nozzles is approximately 8 mm. The pipe guides 70 are ·!

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generally from the lower surface of the nozzle plate .3,2 mm away through the insulation 72 and the .Rohrführung en themselves have a height of about 7 _f 7mm. These dimensions are only given by way of example, but the dimensions and the distances between the individual parts of the pulling device should be very small and the dimensions of j and between the individual parts make it proportionate; difficult to provide suitable coolants that achieve precise cooling of the drawing field, in particular between the nozzles of the drawing field. -.

Are used as in the preferred embodiment, cooling tubes 52 having an oval cross-section according to Fig. 5, the use of these .Röhren is discussed in detail, however, as can other cooling tubes, such as those described in Flg. 6 to 9 can be used, a typical oval cooling tube 50 has a minor axis of 3-9 mm and a major axis of 7.7 mm in length. The cooling tubes are arranged with their major axes in a vertical plane and are guided in the slots 74 of the tube guides 70. The depth of the slots corresponds to half the height of the guide guides 70 or approximately J mm. If the slots 74 are of greater depth, they weaken the ear guides 70 to such an extent that they no longer provide the necessary support for the base plate

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ensure that it can sag.

If the cooling tubes without wings to provide "better cooling to be reached through the outer surfaces of the cooling tubes, are moved upwards, the nozzles would, since the average. The distance between the cooling pipes and the side walls of the nozzles is only two millimeters or less, so tight be arranged next to the cooling tubes that an extremely high cooling effect is achieved, with the risk that some of the cooling tubes come into direct contact with the nozzles and form a short circuit. Me equipped with wings Cooling tubes 52 draw additional heat from adjacent ones Rows of nozzles, whereby the blades are not as cool as the pipes and with greater horizontal spacing between the bores · This way there is no excessive heat dissipation. Besides, the distance is between the wings and the nozzles sufficient to ensure that no direct contact between the wings and the nozzles can arise.

When the .tubs are lifted, the cooling effect on the To improve nozzles, the distance between the pairs of nozzles must be increased so that the necessary distance between the Cooling tubes and the nozzles is guaranteed. Through this

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An increased distance results in a larger nozzle field, which leads to additional problems, since the price of the drawing pan would be increased significantly due to the additionally required platinum or Bhodium, which must be used for the nozzle plate. Any increase in the width of the nozzle field also leads to additional sagging of the nozzle plate and also causes undesirable changes in the year. 1 indicated fan-like angle 0. Of the glass threads 30. If this angle 0 is increased, there is an inequality in the tensile forces on the individual glass fibers that are drawn off by the inner nozzle rows 50 and the outer nozzle rows 48. If the collecting roll 34 is moved downwards in order to keep the angle 0 constant, this now leads to a partial solution to the problem, since there is only a small or no vertical gap that can be cut out under the drawing pan.

To get threads of the same diameter from both the inner and the to get from the outer rows of nozzles, it is necessary- ' agile, not just the viscosity and viscosity changes of the glass at the inner and outer rows of nozzles is so uniform as possible, but in addition, the - Forces ^ which serve to pull and stretch the glass,

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be as even as possible. Therefore, the smaller the angle -0 is, the more evenly they are exerted on the threads Forces on the inner and outer must purists.

The cooling tubes 52 provided with upwardly directed wings 76 can be arranged in the normal position like the wingless tubes, so that the distances between the pairs of rows of tubes do not need to be increased, and the tube guides 70 are not weakened by the required arrangement deeper Slots 74. The wings 76 are generally 1.8 mm wide and extend approximately 4 mm above the outer surface of the cooling tubes. The Jj ¹ IUgel extend in the vertical direction perpendicular to the underside of the nozzle plate 22. While the height of the wings 76 can vary, the wings extend approximately 1.5 mm beyond the jäbene in which the jaiden of the adjacent nozzles are.

More effective cooling is achieved using the finned tubes 52. The effective cooling surface is enlarged and is closer to the nozzles without the strength of the support rod is reduced or excessive cooling is required, which a close arrangement of the Would require cooling tube. The heat transfer from the nozzles

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and the glass beads to the metal surface is mainly done by radiation. ± Given this heat transfer, a slight change in the distance has a multiple effect on the heat transfer according to the formula H = K / D, where H is the amount of heat transfer per unit of time, K is a coefficient of heat transfer and ü is the space between the hot and the cold surface meant at short distances in the distances between the various parts of the pulling and cooling device, against each other results even with a small one Reduction of the resistance means a considerable increase in the heat transfer The drawing pan is given when the distance between the nozzle and the cooling surface is reduced by 0.07 mm an increase in the heat transfer to each side of the wing in the amount of $ 16, so an overall increase in the heat transfer be done at $ 32. .

The tubes 52 equipped with wings have a much shorter heat conduction path from the wing 76 to the cooling water, than is the case with the earlier compact wings. The heat conduction path in the winged tubes 35 is 5 to 7 mm compared to a route of 75 to 150 mm for the previously used compact cooling fins,

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The wings 76, which directly with the tubes 52 through Welding work at a much lower temperature than the previous compact cooling fins. This means that hot glass, which can occasionally come into contact with the fins 76 of the cooling tubes 52, very quickly solidified and as a result of the thermal expansion of the wing 76 is replaced by this break through. In the case of the earlier compact cooling devices that worked at higher temperatures the hot glass that occasionally comes into contact with these solidifies much more slowly and consequently adheres more tenaciously on the cooling fins on_. This results in an increased failure and an increased workload for cleaning and to replace the compact cooling fins. In addition, the risk of damaging the sensitive edges of the nozzles is increased due to the frequent need to replace the cooling device.

The Pig. 1 to 3 show a preferably summary of the Cooling tubes in a drawing pan, the nozzles of which are arranged retracted in the insulating frame. Those equipped with wings Tubes 52 lie between the relatively hotter inner nozzles and the usual oval tubes 54 at the relatively cooler outer nozzles. The heat that is reflected by the insulating frame 44 onto the outer rows of nozzles, the shielding effect produced by the frame and the lower one

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Heat dissipation of the usual oval body 54 between the outer pair and the adjacent pair of rows of nozzles reduce in cooperation with the additional heat dissipation ' through the cooling tubes 52 provided with wings in the inner rows of nozzles the temperature drop between the inner and outer rows of nozzles * This leads to a substantial reduction in failure by the outside lying. Rows of nozzles and the Abbrerinehs through the inside lying row of nozzles

As you can see from FIg-. 4 results, the wings 6 of the cooling tubes can extend over the entire length of the nozzle field "in order to achieve additional cooling for all nozzles of the inner nozzle unit" The wing has recesses for the guide s flat eh 70; · '

With a modified one. Execution arm extend see the Wing: 7'6 not over the entire 'length of the nozzle field.' The wings are only "at those points of the nozzle field located> where hot spots are found ·. The length and The arrangement: this short wing depends a "b on the location of the hot en -" FIe ek en in'dem nozzle field ο. . . - ■

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In a drawing pan containing 1600 nozzles, wings were welded onto the top of oval-shaped cooling tubes, such as is shown in]? ig · ■ 5. This was the heat dissipation increased on the hot plates and a more even temperature profile of the nozzles, thereby significantly increasing productivity or output. -

The technical progress in a cooling device according to the invention is shown in the following table, in the melting speed the glass flow from a drawing pan in the unit of time and the output the useful Product in the unit of time means.

Type of cooling Melting speed Efficiency Output

£ / hr ^: fr

wingless

94 # / ötd * - 333 * 31 # / hour-.

with clever

provided years 96 Ir / h JQfi 67 j ^ / h

Improvement '37 $ 36 # "/

''Hours.

In the case of a drawing pan with oil nozzles, a cooling device was installed according to ü'ig. 2 used. The cooling tubes had an oval shape yuerscnnitt and were provided with wings. The itohrs were

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identical! rager at each end of the drawing pan propped up to ensure even air flows at both ends to reach the drawing pan during operation * The improved Effect of the cooling device results from the following table:.

Type of cooling Melting speed Efficiency Output

, # /Hours. f / h

wingless ■

Hohre '94 # / hour 33 $ ■ 31 # "/ hour

with wings ■
provided ears
at air balance -87 # \ / hr. '$ 85 74 j ^ / hr.

Improvement 52 $ 43 # / hr

The embodiment is described with oval cooling tubes or elliptical cross-section with wings 76, the. himself ■ extend from the top surface of the cooling tubes. However, the cooling tubes can also have wings 78 extending from the itohf according to FIG. 6 extend downwards, or it can at-the top and at the bottom. Side of the cooling tubes wing be provided, as indicated in FIG. 7. Even if the 'wings 78 do not improve the' cooling performance in the same way, like the upwardly directed wings 7b, the wings 78 increase the effectiveness of the cooling surfaces of the iiohre,

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Fig. 8 shows a .Tube 80 with an annular cross-section, which has a wing 82 directed upwards. 9 shows a tube 84 with a rectangular cross-section which has an upwardly directed wing 86. -The rectangular cross-section can of course also be a square one. The cooling tubes with round and rectangular cross-section can of course also be equipped with a mix of downward-pointing wings, or with upward and downward-pointing wings. In addition, more than one wing can be provided on the top or bottom of the cooling pipes. The pulling device "18 of the exemplary embodiment uses three pipe guides and their number can of course be changed be provided the Aohrführung located on iinde. for other pullers can be omitted on iaide located Hohrführungen and a single central tube guidance be provided., äs can also various modifications of the embodiment may be made without the Sehutzumfang to verlassen-..

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Claims (1)

- 25 - -.- ■■ " claims (± y device for the production of glass threads consisting of a drawing pan with a drawing nozzle arranged in rows. 54) below 'and adjacent to the bottom wahd (22) of the drawing pan' (20) and between at least some rows of nozzles (48, 50) serving supports (62) are provided, and that at least some of the cooling tubes (52) at least one longitudinally directed , extending from their surface, in a plane arranged perpendicular to the bottom wall (22) .laid wings (76, 78). 2. Device according to claim 1, characterized in that the wings (76) extend from the surface of the horn (52) extend towards the bottom wall (22). · 5. Apparatus according to claim 1 or 2, wherein the nozzles. from the bottom wall are directed downwards and at their end outlet openings for the molten Gd as have, characterized in that the wings (76) with . 409828/0719 their upper edges lie in a plane which is slightly above the plane in which the outlet openings of the nozzles (24) are! 4. Apparatus according to claim 1, characterized in that the wings (78) extend from the lower surfaces the tube (52) downward away from the bottom wall (22) extend. 5. Apparatus according to claim 1 or 3, characterized in that at least some of the cooling tubes (.52) wings (76, 78) which extend from their upper surfaces to the bottom wall (22) and from their lower surfaces of extend away from the bottom wall (22). 6. Device according to one of claims 1 to 5, characterized. characterized in that at least some of the wings (76) extend over the entire length of the adjacent rows of nozzles (50). 7 · Device according to one of claims 1 to 5, characterized characterized in that at least one of the wings (76) has interruptions and extends over only a part} the length of the adjacent A) rows (50) extend. - j 409828/0719 = 27 - 8. The device according to claim 1, characterized. that the cooling tubes from outer .Rohren (54) and inner ears (52), with the inner ear (52) are arranged between the outer tubes (54), and the outer stirrer (54) ask no wings. 9. Device according to claim 8, characterized in that that the inner cooling tubes (52) have at least one wing (76) extending from their upper surface extends upwards. . . 10. Device according to claim 8, characterized in that that the upper hand of the wing (76) is in one plane lie, which is slightly above the plane receiving the outlet openings of the nozzles (24). 11. Device according to one of claims 1 to 10, in which the drawing pan is accommodated in an insulating frame. characterized in that the bottom wall (22) of the 2 drawing pan (20) opposite the insulating frame (44) back-tested, so. that the insulating frame {44) heat to the outer nozzle rows (48) reflected. . - ZQ - 12. The device according to claim 11, characterized gekennzexcnnet that the cooling tubes (5k, 54) na cross-section are elliptical, and with their larger .diameter perpendicular to the iSodenwandung (kz) directed siiia. ' 13. The device according to claim 11, characterized in that that the cooling tubes (bu) have a circular cross-section own. 14. Vorricntung according to claim 11, characterized in that therefore the cooling tubes (84) have a rectangular cross-section own. Ib). Na device cn a uer claims 1 to 14, characterized \ characterized in that the at the jünd der zaehpi'anne (20) ^; lying younger of the cooling pipes (4ö) are identical to each other, and that the '!' rager (6 2) of the cooling pipes on each jinde have identical support parts in order to obtain the same air currents at the ends of the üiehpfanne ^ 20). 409828/071 9
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