DE2043104B2 - BLOW DEVICE FOR A PAPER COATING SYSTEM - Google Patents

Description

-.other surface intersects the profiled comb in a. -n corner and the profiled edge ^ n of the sharp corner (63) from jv.vaüe! to, n of the support plate lying ,, T, n ,, Tu, er-I _re -V and then back and down in Rieh _u . on the rear deflector arm

;. _rt is
^krUltlt

u ^

The opening of the coating creates a jet of air at an angle. which previously coated, The surface of the moving path is set up and a blow-off machine provided »U its side and outer walls form a »suction chamber.

Such Abblasvornchtungen as they are by the

SS = BBB ^ _t ^
plate, r

desSaskastens is attached, which is the α _{Uen and}

X ^^ d collection chamber openings and collecting chambers extends; and that "" ^^ nT has a flat impact surface.

BSSSB

Air cutter or an air knife for control the thickness of the Sch.cM evoked mist applied to the surface of a moving web in the atmosphere around the paper pulp

because of ^ ^

"büdetra, carried away by this air- ^ ebüde, _collecting chamber r directs.

_{Blow-off device e} is

ElttÄrP ^ rstreich or. Coating, machines with air knives to smooth the on a moved. Coating applied to the web with blow-off devices to equip which to collect or catch the air knife when operating the air knife or the air-cutting fog are used. All previously known devices of this type are however, only insufficiently effective because they leak of the mist from the coating system. Furthermore, the previously known devices must be taken into account not suitable, the covering material blown off by the Luftschne.de from the moving web Aufzubereften, a separation of the fog from the «1 lay

_{for the finer} coating ^ _Sammdkammer.

_{an upper} opening, which _limited under walls

^ J ^^^^ _and in connection with this upper o "BB. _sometimes from

eht ae _{Abschflitteri} built, with their

™, _mie ^ "are laid, that after loosing., The _{ab-TJ ^ men« ^ gewg. Kairimennnenra> um} zu-6o cut little _support roller provided around

ganglich is te _{runs a Luftsc} hne.de

^^^ J _for controlling and smoothing a

Indicate blow-off device for e.ne paper string or Be layering system, all of which follows before ^s ^ ⁱⁿ _{cross-sectional contour} of the support roll,

the blow-off device has a blow-off box mounted inside the blow-off box, which for. Back-up roll axis running parallel to and from. the support roller with spaced angeordi.Ue has boundary lines and. extends transversely to the openings of the suction and collecting chambers into these; moreover is! a vortex suppression P ₁ IaUe is provided, which runs in the interior of the collecting chamber parallel to the axis of the support roller; a coating material return line communicating with the coating material flow tank is connected to the collecting chamber; Furthermore, there are suction blowers, a mist separator and a suction line connected to the suction chamber and the Jebelseparator, the suction device being connected to the mist separator and the air drawn into the suction chamber and the air discharged by the air cutter as well as the air formed thereby; Withdraws mist from the suction chamber through the stator; One of the detachable blow-off box sections includes an upper part, which has the collector and the walls delimiting the suction chamber opening and is mounted on the support roller so that it can be moved away from it, so that the plug-in box top can be disengaged from the normal working position in order to control the suction and To make collecting chambers, the deflection plate device and the WlrheWJiuerrückungsflächen accessible, whereby a device is provided which at least «pushes the box top against the support roller t) between. moves away from this.

In contrast to de? Through the German patent specification 1 (QO 16 $ and the corresponding US Pat. No. 2,679,231 known device, the device according to the invention has the features for solving the above-defined object, which are in particular due to the smaller collecting and collecting chamber arranged in the suction chamber better uptake of the Nepal and a better separation of the solid components guaranteed. In the known device two separate, communicating chambers are not provided, so that the advantageous mode of operation of the blow-off device according to the invention cannot be achieved 673, also has no textured chambers, while in the invention rijp. A nffqp ^ R TpTfffer ^ nnqrhaHy dqr SangVammfx an- ■ ^ e ^ net! '. I> fc-J &i' eweii widely known blow-off> {^ chl ^! ig. (USA - ^ »t ™ tsciirift 3445270), no separate suction chamber is provided ie the British PaLe ^ cJhrift 64? 83 $ a blow-off device which has technically advanced features of the device according to the invention. A preferred embodiment of the invention is explained in more detail below with reference to the drawing
'Fig. 1 a scbernatic. Representation of the new ^ blowing device in, its normal or working position,

! Fig. 2 one of the fig. 1 similar representation of the Blowing device when the Abi is in the retracted position

g eme. compared to the representations according to FIGS. 1 and 2, enlarged schematic sectional view

JasJia <; tens and the flow courses, .jFig.4 είπες, broken away a part of a device similar to that of FIG. 3, in which the air cutting edge is shown at a different angle of inclination and the arrangement of the walls delimiting the suction chamber opening is modified, Fig. 5 shows a section in the direction of arrows 5-5 in FIG. 3,

F i g. 6 shows a section in the direction of arrows 6-6 in FIG. 5 and

F i g. 7 shows a partial section in the direction of arrows 7-7

ίο Fig. 3.

In the following description, the same reference symbols relate to the same or similar components. The web 1, which in the direction of the arrows 2 by a paper coating or coating machine 3 in a paper production line runs, has a cover 4, which is on one side of the web by a Coating roller S has been applied. The doctor roller 5 takes the coating material 6 in the usual way Wake up from a trough 7.

ao The web 1 coated with the coating material 4 runs around a support roller 8 with an air cutter or an air knife 9 the thickness, the surface condition, controls the evenness, smoothness and the like of the previously applied coating 4.

The air knife 9 can be used to carry out different controls and movements accordingly -ler USA. Patent Pen 3,314,163 such be designed and arranged that the angle at which the air jet impinges on the web, the Distance between the nozzle opening and the backup roller, the nozzle opening, etc. can be changed can. Furthermore, the air cutter or the air knife 9 according to the double arrow 11 on the Support roller 8 to be moved to and away from this.

In the retracted position shown in Fig. 2, the nozzle lips in the with the dash-dotted lines Lines 12 illustrated manner are opened. For attachment, adjustment and control of the air knife 9 may be a lever system, not shown, of that described in U.S. Patent 3,314,163 Design are used.

The angle of incidence 10 of the air jet emitted by the nozzle of the air knife 9 is shown in FIGS. 1 and 3 shown at 50 ° This angle is the angle between the center line of the air jet directed at the point of impact 13 and a radial! 'Nie 14 that intersects the axis 8a of the support roller 8 and the point of impact 13. The angle of impact can normally be within the range can be set from 30 to 60 ^c .

Due to the operation of the air cutter 9, the coating thickness and the surface texture are soft determined in a paper coating machine, a disturbing mist is produced.

The new blow-off device has a blow-off box 15 with side walls 16 and 17 and end walls 18 which form an upper part 19 of a suction chamber S. The lower part 20 of the suction chamber S is trough-shaped or container-shaped and with

a suction line 21 connected. The parts 19 and 20 of the suction connection S are tightly connected by a flange connection. The flange connection can be released by relative displacement of the suction chamber parts 19 and 20.

The blow-off or suction box 15 can be attached to any suitable Haltermgs-, carrier or lifting device be held up; he can z. B. be mounted on a cylinder 15 a, with which the air knife

holding lever system is connected. A vertical movement of the suction box 15 is indicated by the double arrow 23 in FIGS. 1 and 2 and horizontal movement is indicated by the double arrow 24 in FIG. 2 specified. In the raised or working position is the position of the blow-off box 15 set with respect to the support roller 8 by bearing brackets 25, in which preferably Stop pins 26 attached to both ends of the blow-off box 15 engage.

Furthermore, holders 27 are on the lower suction chamber part 20 and preferably on both end faces of the upper one Suction chamber part 19 holding pin 28 attached, which the disassembled parts 19 and 20 ir. the in the F i g. 1 and 3 hold the composite position shown in mutual alignment. When the blow-off box 15 is in the position shown in FIG. 2 shown detached Position is, the upper part 19 can be lifted slightly from the lower part 20 to the flange connection 22 to solve. If the blow-off box parts 19 and 20 are in the retracted position (Fig. 2) detached from each other, the upper part 19 can in any suitable manner, for. B. along a rail 29, be moved into the position shown by the dash-dotted lines 30, both ends of the Upper part 19 and its interior for cleaning purposes or the like. Are accessible.

The suction line 21 preferably includes a flexible hose connection 31 to which an inlet nozzle is attached 32 connects to an atomizer line 33 of a separator container 34. The separator container 34 has guide surfaces 35 and a removable cover 36. He also has a drain 37, the is preferably equipped with a U-shaped sealing stub 38 and leads to a drain pipe

A suction pipe 39 connected to the inlet port 40 of a suction fan 41 extends in the separator container 34 and sucks, as shown by the arrow 42, air from the separator 34 from. The suctioned air is drawn off by the suction fan 41, as shown by the arrow 43 in FIG given off the atmosphere.

Each end wall 18 of the blow-off box 15 (Fig. 3) has a curved upper edge 44 which the Circumferential course of the support roller 8 in the illustrated Way is adapted. The side wall 16 of the blow-off box 15 is preferably below its upper edge 45 a at the point 45 provided with a bulge, which is approximately opposite to the direction of movement the path 1 bulges convexly

The side wall 17 of the blow-off box 15 runs approximately perpendicularly and is bent in its upper end section in the direction of the support roller 8 into a flange-like part 46. The flange-like part 46 is adjustably connected at its free end to a V-shaped component 47 via bolts 48 engaging in slots. The V-shaped component 47 ends in a turned-back guide surface 49, which serves to suppress eddies.The curved edges 44 of the end walls 18, the upper edge 45 a of the side wall 16 and the corner edge of the Y-shaped component 47 at the upper end of the side wall 17 form an upper one Opening for the suction chamber S.

In the suction chamber S , an angled wall 50 is also attached, which is at an angle to the side wall 17. A stiffening wall 51 extends between the walls 17 and 50 and between the front walls 18 of the satellite chamber. A gutter-shaped bottom wall 52 with a sump part 53 richly arranged in the Mittelbe is connected to the angled wall 50. The right section of the channel-shaped bottom wall 52 is bent upwards and widened outwards at 54, whereby it forms a further angled or cranked wall which at a distance from the side wall 16 essentially follows its contour. The wall 54 has a transverse rib 54 a, which iu the for a purpose to be described below

ίο Wall 50 is convexly curved.

A channel-shaped component 55 with an inwardly curved hook-shaped end 56 and one after The lower flange section 57, which extends convexly at the top, is detachably mounted on the wall 54 and forms a upper extension of the wall 54. The detachable fastening device for the channel-shaped component 55 has preformed plates 58 which are attached to the inner sides of the end walls 18. the Ends of the channel-shaped component 55 rest on the

so upper edges of the plates 58, and the ends of the lower flange 57 are recessed or Incisions 59 (Figs. 5 and 6) are provided which are designed so that the flange 57 is disengaged with protruding inwards from the end walls 18-

2 $ the pin 60 can be brought when the rough part 55 is moved along the convex flange part 57 to the left (FIG. 3).

Struts, connecting clamps or handles 61 are spaced apart along the component 55 distributed and extending between the hook-shaped end 56 and the lower flange 57 and brace and stiffen the component 55. Under capture of the handles 61 can move the component 55 along an arcuate path in a counterclockwise direction in

be moved to a position where the bolts 60 can pass through the notches 59, so that the "auteil 55 can be lifted out of the blow-off box for the purpose of cleaning the blow-off box.

When the component 55 is installed or in the working position shown in Fig. 3, the angled wall 50, the bottom wall 52, the extended wall 54, the channel-shaped component 55 and its hook-shaped end 56 and the end walls 18 of the blow-off box 15 delimit a Samniel chamber C for the excess coating material within the suction chamber 5. The collecting or collecting chamber C has an upper opening which is arranged below the upper opening of the suction chamber S and is connected to it

Collection chamber opening is through the end walls 18, the hook-shaped end 56 and the V-shaped The web part of the V-shaped component 47 is limited

In the normal working position of the blow-off box 15 (Fig. 3), the upper opening of the suction

chamber S of the circumferential shape of the support roller 8, its distance from the support roller 8 approximately corresponding to that of the coated web 1 from the upper curved edges 44 of the end walls 18
A first baffle 62 is parallel to axis 8i

of the support roller 8 is arranged in the interior of the blow-off box If, its upper edge 63 being at a fixed distance from the support roller 8. The deflection plate 92 runs transversely to the suction and collecting chambers S and C and extends into the suction

chamber S and through the upper opening of the collecting chamber C into the collecting chamber C.

Its second - or secondary baffle 64 jsi also inside the blow-off box 15 parallel to i

9 10

Axis β ″ of the support roller 8 is arranged. Your upper material then flows through line 71 into one Edge 65 has a fixed waste circulation container from the support roller 8.

was standing. When using the air cutter or the air knife

The baffles 62 and 64 are preferably designed to remove the coating liquid from the miter their ends attached to bracket rails 66, 5 away from the track becomes a fog of part swept away on the inside of the end walls 18 or created droplets. This fog formed are brought. One or more struts 67 can be included using air cutting and blow off Flanschförniigen edges 68 and 69 (F i g. 7) on boxes previously known design the cause of the be screwed to the baffles <52 and 64. You most trouble. The fog is stored serve to stiffen and maintain a layer of dry coating material on the the fixed relative positions of the baffle plates 62 surfaces of the overall system. He also kicks and 64. The upper edges 70 of the struts 67 can be in the vicinity of the papermaking plant be sharp-edged. the previously known facilities in disruptive

The lower flange 57 of the component 55 acts on the same extent.

if used as a guide surface for suppressing the eddy 15 The invention is based on the knowledge that education. The guide surfaces 57 and 49 extend in the "Coanda effect" of part of the interior of the air the collection chamber C parallel to the axis 8a intersects at least partially generated air flow the back-up roller 8. from the exit of the mist from previously known

A return line 71 for the coating blow box and its inadequacy arises, or the coating material is to be effectively diverted and collected with the sump part 53 of the ao. Connected to the plenum chamber C and connected to a non-"Coanda effect" involves the inclination of an air-exposed tube which is directed towards an in-flow to follow a surface in which it had previously been conventionally constructed for the recirculating tank. Therefore, some of the coating material tends to result. The circulating container supplies the air cutter 9, in turn, directed to the _{underside of the web, with the coating trough 7 with the over a 5} air jet to it, below the support roller 8 longitudinal traction material 6 of the web counter to the direction of movement of the web

In operation, the air cutter removes some of the flow.

This "Coanda effect" is indicated by the arrow 78 in FIG

coating 4 applied to looping web 1 and FIG. there it was! * with the one indicated by the arrow 78 taking care of it This results in the desired thickness and surface texture of the layer surface of the coating. The flow-through · surface of the web 1 clinging air, but the amount of air given off by the air cutting edge also includes mist and droplets of the from the web on the can for example be 34 mVmin. Such a line of impact 13 of the air cutting removed the above-air jet calls to follow the covering material after hitting the cover.

The new device therefore has a primary coating material according to arrow 72 from the moving web. "deflection plate 62 with a flat surface 79, which separates the flow of torn-off coating material, which separates the flow at a fiber angle to the support roller tangent under a somewhat more acute than the right-hand penetrating air jet, and the or thread-like parts of coating material, which pass through the» Coaudac ^ troma largely locked into the accumulation chamber C are blown and ₄ corresponds p and meet as large a part of this stream by speaking the flux lines 73 m Fifr 3 against the bottom of the collection or AuffangkammerC from wall 50th through the Arrow '2 indicated directs

The plane defining the general direction in the upper edge 63 of the primary baffle 62 is

which of the excess material torn off by the air jet is blown as close as possible to the support roller 8, drawing material from the web, is 4? so that the greater part of the air and the mist particles carried along with it with respect to the radial line 14 are blocked at the same angle and directed downward into the collecting and impacting plane of the chamber C from the air cutting edge 9. The distance between the called air jets. However, "th off upper edge 63 and the supporting roller 8 is normally oriented, blown überzugsmatenal m the zone 73 in the mm in not less than about 3.1, so that the Ablenkplatt, the drawing manner shown sprayed ₅ o 62 is not on the Bahnl deposited coating <

τ ^ lI ^eU J ^e -uZr ^ ^hn ^ ^e9 votes injured However, should the AbstJnd? o small as mög air em- Ech shown 3 de um as much of position moves at .te ^ m Fig be the angle 10 similar a vortex in Coanda
Direction of arrow 74 d. h in the opposite direction due to the between the primary deflection plate 6:

above. The guide surface 49 ^ suppresses this vortex 55 and the pathway necessarily existing intermediate effect, so that the mist, the droplets or the like, flows in space part of the? T nft al "" roanHaa-StroD contained in the eddy are collected over the upper clot of the p ^ tte 62; ? Eota * S or at 75 downwards in the direction of the arrow along 63, starting from the surface 79 ^ of the inside of the angled wall 50. next parallel to the tangent L of the support roller practically all of the air cutting edge f. »« «« p.rtnASiS ^^ jJSSSi. Wet covering material, which is present in liquid form, and a cut-off material which is worn backwards and downwards, is directed 80 away onto the wall 50 in the area 73. This liquid coating material flows along the edge 63 and the roller 8, air and the wall 50 (arrow 76) down to the bottom of the "MaTSf to £ aui'Gnm collecting chamber C and in the sump part 53, where the, 65 of the "Coanda effect" of the curved surface 80 the liquid is caught, as by the liquid deflector 62. This? wSS ^ ese air m feätsspiegel 77 is indicated The liquid coating

11 12

The above fluid is sprayed or distributed, as shown at 82, along the path indicated by arrows 91. This fluid emerges from the collection chamber C. They flow into the holding lighter mist and droplets of the coating suction chamber C and combine with the air material. These components hit the left upper mist mixture, which, as previously described, surface of the secondary baffle 64, from where the 5 run through the suction of the suction fan 41 via liquid coating material into the collecting chamber C, the path indicated by the arrows 92 can (83). the suction chamber 5 can be withdrawn.

The main flow of the air withdrawn from the suction chamber S by the primary baffle

62 diverted coating material flows to the left mist mixture flows through the line 21 and the Surface of the baffle 62 and runs into the hose 31 in the separator 34. In the separator 34 Collection chamber C, as indicated by arrow 84, the mist particles are separated off, at the bottom of the indicates is. Separator risen and over the drain pipe

At point 81, however, not all of the air is discharged, while the air from the suction fan is discharged into the remainder of the air-mist mixture hanging on the roller 8, the atmosphere at 43,
mix is diverted downwards, but part of the js The suction fan has a suction power of 102 past the edge 63 of the first deflector plate 62 - up to 105 m ^s / min. This amount is approximately three times flowing fluid follows the course of as large as that of the air cutter in the blow-off roller 8. This remaining fluid flow is box 15 delivered amount of air. This means that again partially blocked and, in the direction of the arrow, additional air is diverted from the vicinity of the upper opening 85 by the secondary baffle 64. The opening of the suction chamber into the upper edge 65 of the deflection plate 64 into the suction chamber is used to pull and hold back the mist within the blow-off at the same distance from the roller 8 as the upper edge of the box.

63 of the first baffle 62 is arranged. However, it is to be caught and carried out.

the top edge 65, as in FIG. 3 is shown sharp- It was indicated above that the air cutting

edged. It directs most of the ace that hits it at an angle of 50 ° (Fig. 3). if

Residual air and the entrained particles, which this angle is reduced, for example

through the upper edge 65 of the deflector plate 64 to 40 °, as shown in Fig. 4, is the angle,

formed gap flow through, downwards in the direction under which the coating material from the air

of arrow 86. cut 9 is thrown off, (line 93) as well

The current flowing in the direction of arrow 86 is smaller. This means that the use of the V-conveying

Medium mixture will become superfluous in the channel-shaped component shaped component 47. The component 47

55 caught. The liquid coating material can be replaced by an upper lip plate 94

collects at 88 in the channel-shaped component 55, which, as shown in FIG. 4 shows the upper opening of the

and flows through openings 89 formed therein in a blow-off box.

(FIG. 5) in the lower part of the collecting chamber C. 35 The in the in FIG. 4 thrown off.

The speed of the air after passing the coating material hits the wall 50 of the

at the upper edge 65 of the secondary baffle 64 collecting chamber, i.e. at such an angle,

is very low. This circumstance and the expansion that one is formed by the deflected air

the air, after it has passed through the narrow gap, causes the vortex to move in a counterclockwise direction.

Above each of the baffles 62 and 64 increase 40 leads. In this case there is no need

the suction of the suction fan 41, which allows the use of a vortex-depressing

Pressure in the suction chamber S is reduced and that in the guide surface, as it is, for example, as component 49

Suction chamber 5 on the right side of the secondary in FIG. 3 embodiment shown

baffle 64 remaining air and the entrained, which is to suppress one indicated by the arrows

sucks a mist out of the blow-off box. The air 45 74 vortex shown serves in a clockwise direction.

Mist mixture flows during the suction process. The angle of attack of the Luftschneirtp 9

Air released between the component 55 and the arched wall can aas when the system is in operation

45 of the blow-off box 15 without being changed for various reasons, since the

box, e.g. B. at the edge 45 a of the wall 16, from the angle is determined by several factors, namely

Exit blower box. 50 borrowed the viscosity of the coating material that

Air supplied by the air cutter, soft desired weight of the coating to be produced, the

together with the liquid or foggy speed of the moving path, the surface

The condition of the coating material from the good or smoothness, etc. If the

guide plates 62 and 64 in the lower part of the given variable certain angle is so that £

Collection chamber C has been deflected, it can be directed to a 55 in the collection and suction chamber

Circulating flow (arrows 90) with vortex formation below the air cutting an air movement irr

to lead. The clockwise direction, designed in the form of a baffle, creates the Würbe

However, flange 57 suppresses any significant suppressive baffle 49 usage. Wenr

Vortex effect. The circular air vortex flow. on the other hand, the angle of incidence of the air cutting edge is like this

As shown by the arrows 90, hurls 60 that a rotational flow of air hn against

If particles or droplets of the coating material turn clockwise (Fig. 4), this will find the lips

by centrifugal forces. This coating material-shaped component 94 use,

collects in and on the walls of the collecting The basic concept and the in preventing

chamber C and flows into its bottom part. Be the rib leakage of mist from the blow-off box

54 α prevents the vortex 90 from draining the 65 standing technical success of the new Abblasvorrich

liquid material through the openings 88 interferes. processing are based on the structure, the form, the arrangement

The air itself and the fine mist it entrains, and the spatial relationship of the baffles 6 ^

which circulate within the collection chamber C , flow 64 with respect to the other parts of the device

lung. This arrangement inhibits the "Coanda" air flow along the painted web surface at the periphery of the backup roll and ultimately deflects it in such a way that virtually all of the air and entrained particles are deflected or returned to the collection chamber C, the speed and pressure of the The residual amount of air and the particles contained in it should be reduced so much that the residual fluid is removed from the suction chamber S by the suction of the suction fan 41.

The new blow-off box system is the first

direction for a paper coating system, which prevents the exit of fog, dust, steam and the like. prevented from a system in which an air cutter is used.

The new device is also characterized by its simple structure. The blow-off box can easily be removed from the working position and disassembled into upper and lower parts, wherein the inner surfaces of the collection and suction chambers, the baffles and the baffles for Suppression of vortex formation are easily accessible to be cleaned if necessary.

1 sheet of drawings

Claims (14)

Patent claims: 1. Blow-off device for a paper coating system, one with a coated surface provided moving web is guided around a support roller and one near one upwards moving path section arranged air cutting to control the thickness and surface condition of the coating an air jet at an angle to the previously used ίο layered surface of the moving web and a blow-off box is provided, the side of which and Sti.v.wand form a suction chamber, characterized in that in the Suction chamber a smaller collection or collection chamber (C) is arranged, on the upper side of which an opening is provided; that the top edges (45 a, 49) of the side walls (16, 17) and those adapted to the contour of the support roller (8) Upper edges (44) of the end walls (18) limit an upper opening of the suction chamber (S), which with Distance above the upper opening of the collecting chamber (C) and with distance below the is arranged around the support roller revolving coated web (1), wherein the upper opening the suction chamber is larger than that of the collection chamber and from one below and near the Air cutting edge (9) arranged, (5 and C) jointly belonging edge is limited; that further one parallel to the aclise (8 g) of the back-up roll (8) arranged baffle plate (62) inside the blow-off box (15) is fixed at a fixed distance is held to the support roller and transversely to the suction and collection chamber openings in the Extends suction and collection chambers; and that the baffle (62) has a flat baffle, which make up a substantial part of the amount released by the air cutter (9) and the coated Surface of the moving web (1) following the support roller and the air deflected by the action of the air cutting, entrained by this air and mist into the collecting chamber (C). 2. Blow-off device according to claim 1, characterized in that a guide plate (49) for Vortex suppression inside the collecting chamber (C) parallel to the axis (8 a) of the support roller (8) is arranged. 3. Blow-off device according to claim 1, characterized in that the collecting chamber (C) bounding walls include an outwardly projecting front wall (54) and an angled rear wall (50) which in a one ^; n the suction chamber (5) located sump-forming channel-shaped wall (52) converge, and that an upwardly convex curved wall (57), which forms a guide surface for vortex suppression within the collecting chamber, protrudes from the front wall (54) into the collecting chamber. 4. Blow-off device according to claim 1, characterized in that an adjustable V-shaped component (49), which the upper openings of the suction and collection chambers. (S and C) delimiting edge forms, and has a downward into the collecting chamber (C) facing flange part as a guide surface to suppress the formation of eddies. 5. Blow-off device according to one of claims 1 to 4, characterized in that the rear wall (50) on which the upper openings of the two chambers (5 and C) delimit Edge ends and that the outwardly overhanging wall (54, 55) in a üie opening the upwardly and inwardly curved edge (56) delimiting the collecting chamber (C) ends. 6. Blow-off device according to claim 1, characterized in that the flat baffle surface the baffle (62) ends at the top in a corner (63) and at an acute angle to a radial plane runs, which pierces the axis (8 a) of the support roller (8) and the upper corner (63). 7. Blow-off device according to claim 6, characterized in that the deflector plate (62) has a curved upper edge (80) which extends from the upper corner (63) into the collecting chamber (C) is bent inwardly so that a portion (81) of the through the gap between the baffle and following the path of air-mist mixture flowing along the curved deflector plate edge (80) in the collecting chamber (C) is directed. 8. Blow-off device according to claim 1, characterized in that a plurality of baffles (62, 64) are provided, each of which has flat baffles to inhibit the flow of the released by the air cutter (9) and following the coated surface of the moving web Air and that which is formed by the action of the air cutting edge and which is carried away by this air Has fog. 9. Blow-off device according to claim 1, characterized in that Jn mist separator (34) is connected on the one hand to the suction chamber (S) of the blow-off box (15) and on the other hand to a suction fan (41), the suction fan being connected to air and mist entrained in it from the Suction chamber into the separator (41) and draws air from the separator into the atmosphere (43). 10. Blow-off device according to claim 1, characterized in that a supply container for the coating material is connected to the collecting chamber (C), in which the liquid coating material collected in the collecting chamber (C) is discharged; and that an exhaust fan (41) and a separator (34) are connected to the suction chamber (S) for exhausting the air and the mist. 11. Abblasvor'ichtung according to claim 1, characterized in that the suction chamber (S) delimiting walls (16, 17, 18) consist of detachable upper and lower parts (19, 20), wherein the upper part (19) the Walls (50, 52, 54, 55) delimiting the collecting chamber (C) and the walls delimiting the suction and collecting chamber openings, and that at least the upper part (19) can be pushed against the support roller (8) and can be moved away from it. 12. Blow-off device according to claim 1, characterized in that the suction and collecting chamber walls (16 _: 17, 18, 50, 52, 54, 55) of the blow-off box (15) can be pushed against the support roller (8) and can be moved away from it. 13. Blow-off device according to one of claims 1 to 4, characterized in that guide hleche (49 57) for vortex suppression in the interior of the collecting chamber (C) are detachably attached parallel to the axis <& a) of the support roller (8). 14 blow-off device according to claim 1. dartrrch characterized in that the air cutter (9) door change in its angle of impact (10) controls «Is ela ° ert and a within the collective LTC) and below the air cutting edge to the axis (8 a) of the support roller (8) anseorders Guide plate (49) to suppress the Wirhflhildup " is attached adjustable in adaptation to the setting of the Lutt.cbneide. I ^ \ bblasvorrichtuna according to one of the preceding Claims, characterized by ^. lklt (62) i d d i directions of this type to be met requirements, namely reduces foam formation, prevents the mist from escaping from the blow-off box. also catches the entire air flow coming from the air knife and the greatest possible 1 speed of the blown coating material and returns to the circulation tank, which is used as a supply tank for the through the stripping machine Applied covering material is used; which also the formation of dry coating material or color in the system and thus the soaking cycle reduces steam emission from the blower and the blow-off box prevented, al.e lNeoci Seeing claims, characterized ^, including the dry egg deposited at the end The baffle (62) hates a front and a solid component of the mist within aes a> has a right surface, which by a? p ™ - «ems and you from the anIa <' Edge are connected to each other, separating air flowing to the drain. Also should 'the peeling off associated with the etching device: to Inspection * and cleaning purposes light accessible _{or similar} Be hh. ,. · _; , _r According to the invention, this object is b «e, no Device of the type mentioned in that in the suction chamber a smaller collection ozw. W. fanekamm-r is arranged, unites at the top Opening is provided: that the upper edges of the Side walls and those of the contour of the support roller anepassten upper edges of the end walls an upper one Limit the opening of the suction chamber, d-e at a distance above the upper opening of the collecting chamber r- Frfmdung concerns e, ne Abbhtsvornchtunsz for 30 and at a distance below the ■ ^ ™ ^ 'P uS line system, one of which is coated with a circumferential ».Bnngrd Edge