DE10127232B4 - Apparatus for treating a particulate material with a coating medium - Google Patents

Abstract

contraption for treating a particulate Guts (12) with a coating medium (14), in particular for coating pharmaceutical, food, technical or chemical moldings, with a container (26; 161) around a horizontal or oblique Rotary axis (27) is rotatable and surrounding the axis of rotation (27) container wall (28; 163), further comprising a spraying device (62) for spraying the material (12) with the coating medium (14) in the container (26; 161), and with a process air device (70; 134; 176) for pressurizing the material (12) with process air, wherein in the container (26; 161) circumferentially distributed and the container wall (28; 163) adjacent a plurality of spaced apart ones Guide vanes (36; 152; 162) are arranged which extend from the axis of rotation (27) and seen in the direction of rotation to the container wall (28; 163) so inclined sloping are arranged that they are able to at least a part of the particulate Guts (12) in the upper region of the container (26; 161) to take and essentially over the...

Description

The The invention relates to a device for treating a particulate material with a coating medium, with a container, which is rotatable about a horizontal or oblique axis of rotation and a the axis of rotation surrounding container wall further comprising a spraying device for spraying the Guts with the coating medium in the container, and with a process air facility for pressurizing the material with process air, wherein distributed in the container circumferentially and the container wall adjacent a plurality of spaced apart vanes are arranged, viewed from the axis of rotation and in the direction of rotation to the container wall so oblique are arranged sloping that they are capable of at least part of the particulate Guts in the upper area of the container take along and essentially cover the entire length of the container extend and with the container rotate.

Such a device is from the document US 5,501,874 known.

A Device of the type mentioned is in the pharmaceutical, chemical, sweets and food industry uses. In the pharmaceutical industry are made by coating or film coating, also film coating called, film or coated tablets produced, including one with a polymer coated Pharmaceutical forms understands.

The however, the present invention is not limited to film coating can be, for example also apply to granulation, starting from fine Good particles this with the coating medium coated to agglomerate the particles together, finally larger particles to create.

At the Moldings are coated using a mostly sticky suspension or solution coated. The material to be treated is to a container or Kettle filled, the good in the container by turning the container about a substantially horizontal or oblique axis of rotation in a continuous Overturning Circulation is moved. While this revolution the material to be treated is sprayed with the coating medium, and by means of process air becomes this coating medium dried. By the circulation of the Guts enters a mixture of the good in the container.

The coating medium is doing in the rotating container on the moving particulate material sprayed nowadays by means of a spray nozzle system.

The quality the finished coating of the particulate material depends both when filming as well as filming the even, fast, but gentle change of the property to be coated. The nature of the circulation of the to be coated Guts in the container also has considerable influence the possible Type of application of the coating medium and on the effectiveness drying, with application and drying again the quality of the coating significantly influence the finished coated Guts.

In the above-mentioned document US 5,501,874 a device for coating particulate material with a coating solution is described. The device has a container rotating about a horizontal axis, in which a plurality of guide vanes are arranged distributed circumferentially. The guide vanes are connected with their end facing the container wall with the container wall without clearance. By means of the guide vanes, partial quantities of the particulate product are taken from a lower region of the container to the upper region of the container, and from there they fall into a vertically arranged tube, in which they are sprayed with the coating solution by means of spray nozzles. Into the tube is fed from bottom to top a drying gas for drying the sprayed Guts. The vanes have the advantage of taking advantage of the entrainment of Guts in respective subsets from the lower region in the upper region of the container on the one hand more volume of the container for the movement and mixing of the Guts, and on the other hand, that by means of the vanes a loosening of the entire good volume is reached, which then can be better flooded on the one hand by the process air and on the other hand also a more uniform spraying with the coating medium allowed because no compact bed is formed in the container.

One Disadvantage of the known device, however, is that between the respective entrained by the vanes subsets of the particulate Guts no further mixing takes place.

Another device for granulating particulate material is known from EP 0 491 638 A2 which has a container rotating about a horizontal axis, on whose inner container wall a plurality of guide vanes for carrying respective subsets of the particulate product from the lower to the upper region of the container are arranged. The vanes directly adjoin the container inner wall, as in the previously mentioned known device.

Other comparable devices are in the documents US 4,842,790 and US 4,272,234 described.

From the document US 5,721,012 is another device for the continuous coating of particulate material, such as seeds known. The device comprises a rotating about a horizontal axis container in which a small number of sheets are present, which also seen in the direction of rotation of the container sloping down to the center of the container so that they are unable to, the good from the bottom to the top of the container.

Finally, out of the US 4,640,218 a device for coating pharmaceutical tablets or the like with a medium such as sugar or the like described. The apparatus comprises a cylindrical vessel rotating about a horizontal axis in which the tablets are circulated in a compact bed within themselves. On the container inner wall so-called mixing baffles are arranged, which are intended to help loosen up the self-circulating bed, but this succeeds only inadequately with such mixing baffles. A comparable device is known from WO 84/03233 and the US 2,671,009 known.

Of the Invention is therefore based on the object, a device of develop the aforementioned type such that the above mentioned disadvantages are avoided, that in particular an improved Mixing of the goods is achieved in the container.

According to the invention this Task in terms of the aforementioned device characterized solved, that the Vanes at their vessel wall facing end of the container wall are spaced, which in each case a passage gap between the container wall and the end of a respective vane.

Accordingly, according to the invention provided to space the vanes from the vessel wall, wherein the distance is chosen is that he it allows the good advantageously, contrary to the direction of rotation of the container partly from the guide vanes again, resulting in another Mixing of the product between several subsets, i. more Cascades, results. So there is one more when you climb up the estate additional Mixing takes place in a gentle way.

In a preferred embodiment, it is provided that in the container a stationary return surface for the estate is arranged, extending from an upper portion of the container with respect to the Vertical oblique outward and extending below, wherein an upper end of the return surface facing the axis of rotation Ends of the vanes is adjacent.

This return surface, which extends as the vanes substantially the entire length of the container, and which is inclined with respect to the vertical, has the advantage that the effluent in the upper region of the container from the vanes Good not vertically through the container in the lower Range falls back as in the device according to US 5,501,874 but first on the return surface gently over at least a portion of the container slides down, whereby the sloping Good loses kinetic energy through the slope of the return surface, ie there is a certain slowing down the flow of the goods. This also contributes to a gentle movement of Guts in the container.

In In another preferred embodiment, the return surface ends approximately at height a horizontal median plane of the container.

After this the flowing on the return surface sliding Well, it has lost some of its kinetic energy about at height the horizontal median plane of the container of this in a vertical Move under gravity, creating a "particle curtain" in the fall area, in which the individual good particles under the action of gravity at greater distance go to each other, i. there is another gap spacing of the property.

In Another preferred embodiment, the spray device at least one spray nozzle on, which was in the lateral From the lower end of the return surface is arranged below the same.

Of the previously mentioned Particle curtain is now particularly well suited as an application zone for spraying of the good with the coating medium. The coating medium becomes common by means of spray air sprayed on the estate. The loosened particle curtain can now advantageously the Spray air of spray easily happen while the coating medium even on the surfaces of the property to be treated remains stuck.

Of the spraying distance to the falling back particles may preferably be about 30 to 150 mm, more preferably up to 100 mm, be.

In a further preferred embodiment it is provided that the at least one spray nozzle is a linear gap nozzle with a nearly over the entire length of the container extending spray gap.

The aforementioned measure has the advantage that the sloping from the return surface Good about its entire longitudinal extent from the coating medium is achieved, whereby a respect the entirety of the particles particularly uniform treatment with the coating medium is reached.

The Linearspaltdüse the sprayer dives preferably in the longitudinal direction of the container in this one and directs the spray with respect to the axis of rotation of the container directed to the outside Component on the receding Well.

In a further preferred embodiment of the spray nozzle is opposite arranged another return surface, which is adjacent to the axis of rotation facing the ends of the vanes.

hereby is advantageously achieved that the sloping Good on loses kinetic energy or potential energy and also is avoided that this sloping good already when spraying prematurely on the at this Application zone passes passing vanes.

In According to another preferred embodiment, the container has two side walls on, between which the vanes are arranged, and have the side walls on the axis of rotation facing the end of the vanes each one inward projection on.

The projections on both side walls of the container for example, formed as a collection of the side walls in the form of a V. be able to effect advantageously that the sloping from the return surface Good of the sidewalls of the container in the application zone in which the coating medium is sprayed onto the material, remains spaced, thereby avoiding that the side walls with the coating medium be wetted. Thereby, the aforementioned linear gap nozzle, the longitudinal ends of the "particle curtain" without spraying the side walls of the container to act on. This is especially true with regard to keeping clean the boiler advantageous.

In a preferred embodiment, the container wall of the container is permeable to air, and the process air facility has a process air chamber, the container wall surrounds, wherein the process air chamber is divided into a Zuluftkammer and at least one exhaust chamber.

About the Supply air chamber is the process air in the container blown and over the exhaust chamber discharged again. In a division of the process air chamber in a Zuluftkammer and only one exhaust air chamber, the supply air to 180 ° guided in the container blown and over the exhaust chamber again guided by 180 ° and be discharged after double flooding of the material from the container.

Especially it is preferred if the at least one exhaust chamber a exhaust fan is assigned by a supply air fan for the supply air chamber independently in the power is adjustable.

in this connection is an advantage that in particular in connection with the double flooding of the estate with the process air in the ascending and descending area of the estate in the container one can be adjusted in areas targeted drying effect, for example, in the descending region in which the coating medium is sprayed on, through stronger ones Exhaust air extraction a higher drying efficiency as in the ascending area, in which the coating medium already pre-dried is to be achieved.

In a further preferred embodiment, the process air chamber at least two exhaust air chambers, and are both exhaust air chambers with different suction strengths acted upon.

This For example, it can be advantageously used to Suction of the one exhaust chamber, the process air the area of application of the coating medium sucks, specifically higher to adjust the proportion of spray air the spraying device spontaneously from the container suck.

In In an alternative preferred embodiment, the vanes are formed as at least partially air-permeable hollow profiles, as supply air or exhaust air ducts for the process air serve, and has the process air facility at least on a side wall of the container, preferably on both side walls, one Supply air chamber and an exhaust chamber on.

These Design of the process air device, in which formed the individual vanes in the form of hollow sections are themselves part of the supply air and exhaust system for the process air, has the advantage of being on one the container surrounding process air chamber as can be dispensed with in the previous embodiment, whereby the overall device with the same container size overall smaller build accomplished can be. In addition, can the container wall be impermeable to air in this embodiment.

It is understood, however, that the aforementioned embodiment also with the aforementioned embodiment can be combined, i. for example, it could be the supply air over the be fed as hollow sections trained vanes, while the exhaust air over the container wall, which then permeable to air is, can escape, or vice versa. However, if on the circumference um the container wall arranged process air chamber ver is dispensed, the container wall in principle impermeable be educated.

In a further preferred embodiment, the aforementioned return surface and the possibly provided further return surface also air-permeable, for optimal process air flow and thus flooding the particulate Guts to achieve. In the same way the vanes, even if they are not designed as hollow sections are and as process air supply or process air discharge serve, permeable to air be formed to the property thereon by the vanes to be able to flood through it.

In Another preferred embodiment are on the vanes laterally inclined guide elements on its lifting side for movement of the material in the longitudinal direction of the container arranged.

These measure has the advantage that an additional Mixing of the goods also achieved in the longitudinal direction of the container can be. Such guide elements can, for example, of the guide vane to lead vane in the opposite direction.

In In another preferred embodiment, the vanes are relative to the longitudinal axis of the container inclined, preferably from vane to vane with, respectively opposite inclination.

Also This can be the good during its entrainment by the vanes a movement in the longitudinal direction of the container be loaned by the good then on the inclined vanes with component in the longitudinal direction the container, i.e. with component in the direction of the axis of rotation of the container, moves and thus also mixed in this direction.

at The device may preferably be provided that the guide vanes are narrower in the direction of the center of the container. If only part of the entire product on the individual vanes flow in can, remains the rest Part of the material at the bottom of the container always above the vanes in a rolling motion, with the advantage that the vanes are always completely filled. However, the part draining from the return surface is of the good, i. the "particle curtain", rejuvenated to an even thinner layer because always lingers a certain volume of material in the lower part of the container, but this is constantly exchanged for flowing good, so that also hereby no compact bed arises.

In Another preferred embodiment is an emptying device provided for emptying the finished Guts from the container, a in the container having engageable groove, which extends in the longitudinal direction of the container obliquely from above extends below.

On This way the material can be particularly gentle in a sliding movement removed from the container become. Furthermore, there is the possibility of the estate from the Rotary movement of the container in the To promote interaction with the vanes in the gutter by the material in the upper region of the container from the respective vane falls into the gutter.

to Intensification of the emptying is in another preferred Design provided that at least one of the vanes for emptying the Guts in conclusion with the container wall is displaceable.

This is particularly advantageous in connection with the embodiment, after the individual vanes are spaced from the container wall. However, if at least one of the vanes is so displaceable is, that you with the container wall in The end comes will be a drain of the material from this vane and flowing back along the vessel wall suppressed whereby a more rapid emptying of the container from the rotational movement out allows becomes.

Further Features and advantages will become apparent from the following description and the attached Drawing.

It understands that the mentioned above and the features to be explained below not only in the specified combination, but also in other combinations or alone, without to leave the scope of the present invention.

Selected embodiments The invention are illustrated in the drawings and with reference closer to this described. Show it:

1 a cross section through an apparatus for treating a particulate Guts with a coating medium;

2 a section along the line II-II in 1 ;

3 the device in 1 and 2 in the operating state of emptying the container;

4 a section along the line IV-IV in 3 ;

5 a schematic representation of the device in 1 and 2 with split and removed process air chamber;

6 a 1 comparable representation of one with respect to the device in 1 slightly modified embodiment, wherein 6 the device in a lower degree of filling compared to 1 shows;

7 a section along the line VII-VII in 6 ;

8th a 6 Comparable representation of a device according to another embodiment, compared to the device in 6 and 1 is slightly modified;

9 a 1 respectively. 6 or 8th comparable representation of another embodiment of a device according to the invention;

10 a section along the line XX in 9 ;

11 a section along the line XI-XI in 9 ;

12 a section along the line XII-XII in 10 ; and

13 a single vane of the device in 9 to 12 ,

In 1 to 5 is one with the general reference numeral 10 provided apparatus for treating a particulate Guts 12 with a coating medium 14 shown. The device 10 is used in particular for coating pharmaceutical, food, technical or chemical moldings.

In 1 and 2 as well as in all subsequent figures is the particulate material 12 illustrated by a variety of points. The coating medium 14 is in 1 represented by a spray.

The device 10 generally has a housing 16 on, which has a caseback 18 , an upper housing part 20 as well as housing sump parts 22 and 24 having.

In the case 16 is a container 26 for receiving the particulate material 12 arranged.

The container 26 is about a horizontal axis of rotation 27 rotatable.

The container 26 has a container wall 28 on that the rotation axis 27 completely surrounds the container wall 28 in ge showed embodiment is cylindrical, over the entire length of the container 26 extends and concentric with the axis of rotation 27 is arranged.

The container 26 also has a front side wall 30 and a rear sidewall 32 on ( 2 ).

The side walls 30 and 32 of the container 26 are essentially flat.

The front side wall 30 has a door 34 which can be opened as with 34 ' is indicated.

In 1 as well as in all subsequent figures is as the direction of rotation of the container 26 one clockwise or one clockwise rotation is assumed.

In the container 26 is a plurality of vanes 36 arranged. The vanes 36 extend over the entire length, ie in the direction of the axis of rotation 27 continuous between the side walls 30 and 32 of the container 26 , The vanes 36 run parallel to the axis of rotation 27 or parallel to the longitudinal axis of the container 26 , The vanes 36 however, also with respect to the longitudinal axis of the container 26 or rotation axis 27 slightly inclined, and then preferably with vane 36 to vane 36 opposite inclination. The vanes 36 rotate as the container rotates 26 with this one. The vanes 36 are preferably with the side walls 30 and 32 welded, but can also be made of these removable and therefore interchangeable. The vanes 36 are in the embodiments shown up to the sides walls 30 and 32 however, they could also be fitted with cross members with the side walls 30 and 32 be connected so that at the longitudinal ends of the vanes 36 a passage gap for the estate 12 remains.

The vanes 36 are the container wall 28 adjacently distributed along this, and Although preferably at equal angular intervals. Overall, the in 1 and 2 shown embodiment twenty vanes 36 in the container 26 available.

In the in 1 and 2 embodiment shown are the vanes 36 formed as thin sheets, which are seen in the manner of a S in cross-section substantially curved. The vanes 36 are in this embodiment in particular impermeable to air, but may also be permeable to air through a corresponding perforation. Furthermore, the vanes can 36 also have larger breakthroughs, a small part of the lifting side of the vanes 36 located estate 12 a drop to the respective trailing vane 36 allow, thereby further mixing the estate 12 several cascades is achieved.

The individual vanes 36 are mutually spaced apart, so that at their the container wall 28 facing the end 38 and at one of the axis of rotation 27 facing the end 40 between each adjacent vanes 36 an open passage gap for the particulate material 12 is formed.

Furthermore, they are the container wall 28 facing ends 38 the individual vanes 36 from the container wall 28 spaced so that also between the container wall 28 and the end facing this 38 the vanes 36 in each case one passage gap between the container wall 28 and this end 38 for the particulate material 12 is available.

Regarding the container wall 28 run the vanes 36 , like out 1 shows, not radially, but obliquely, and seen in the direction of rotation to the container wall 28 sloping down. At her the tank wall 28 facing end are the vanes 36 gently curved against the direction of rotation, and at its the axis of rotation 27 facing the end 40 are the vanes 36 gently curved in the direction of rotation.

In the container 26 is still a return area 42 arranged, which is formed in the form of a sheet which is permeable to air, for example perforated in the embodiment shown. The return surface 42 is in the container 26 Fixed, ie it does not rotate with the container 26 With. The return surface 42 has an upper end 44 on, that of the axis of rotation 27 facing ends 40 the vanes 36 is adjacent and has a slight distance to these. From the upper end 44 the return surface extends 42 with respect to the vertical obliquely outwards and downwards and ends with its lower end 46 approximately at the height of the horizontal median plane of the container 26 or in other words approximately at the height of the axis of rotation 27 but laterally spaced therefrom.

The return surface 42 extends according to 2 at its upper end 44 essentially over the entire length of the loading container 26 but tapers from the upper end 44 to the lower end 46 out. Lateral edges 48 and 50 the return surface 42 are angled upwards.

The door 34 and an opposite access area 52 form parts of the sidewalls 30 and 32 of the container 26 However, do not rotate with this and are on appropriate ring seals 54 and 56 against the co-rotating areas of the side walls 30 and 32 sealed.

At their mitdrehenden areas have the side walls 30 and 32 each an inwardly directed annular projection 58 respectively. 60 in the form of a V on.

The device 10 also has a spraying device 62 for spraying the particulate material 12 with the coating medium 14 on that in the container 26 through the door 34 dips in and is also stationary. The sprayer 62 has a spray nozzle 64 in the form of a linear gap nozzle extending substantially the entire length of the container 26 parallel to the axis of rotation 27 extends. The spray nozzle 64 is below the lower end 46 the return surface 42 opposite this slightly direction of rotation 27 placed back, ie laterally spaced from this.

The spray nozzle 64 is via supply lines 66 and 68 for spray air and for the coating medium 14 provided ( 2 ).

The spray nozzle 64 is directed so that the spray 14 directed substantially horizontally outwardly from the spray nozzle 64 exit.

The device 10 further includes a process air device 70 for applying the particulate Guts 12 in the container 26 with process air on. The process air is in 1 and in the following figures by wide flow arrows 72 illustrated.

The process air setup 70 the device 10 has a process air chamber 74 on top of the air-permeable container wall 28 completely surrounds. The process air chamber 74 is in a supply air chamber 76 and an exhaust chamber 78 divided according to 7 even separated from each other and according to the container 26 can be removed.

The supply air chamber 76 is in the assembled state of the exhaust chamber 78 about lip seals 80 and 82 sealed impermeable to ensure that the process air from the supply air chamber 76 not in the exhaust chamber 78 can pass without passing through the interior of the container 26 with double flooding of the estate 12 to have passed through.

Opposite the side walls 30 and 32 of the container 26 is the process air chamber 74 about ringlip seals 84 and 86 sealed.

The supply air chamber 76 has an upper supply air duct 88 on which an unillustrated supply fan is assigned, while the exhaust chamber 78 also in the upper part of the process air chamber 74 above the container 26 , but on the opposite side, an exhaust duct 90 has, which is associated with an exhaust fan. The exhaust fan is in his Lei Stung, more precisely suction, independent of the supply fan adjustable.

As a rotary drive for the container 26 is a roller drive with a motor 92 and a role 94 provided, the role 94 on a ring flange 96 the side wall 32 unwinds and thereby the container 26 set in rotation. At the upper part of the ring flange 96 is a pressure roller 98 provided, and on the opposite side to an annular flange 100 the side wall 30 runs a role 102 , where the roles 98 and 102 serve as pressure rollers. As in 5 is shown is another role 104 provided as a support roller on the annular flange 96 runs, and on the opposite side there is a corresponding, not shown support roller, which on the annular flange 100 running.

In the following, a method for treating the particulate material with the coating medium will now be described first 14 described that with the device 10 can be carried out.

The particulate material 12 is first through the door 34 in the container 26 introduced, where it then falls first in the lower area. By turning the container 26 around the axis of rotation 27 this will be at the bottom of the container 26 Good through the vanes 36 in subsets or cascades in the upper area of the container 26 taken along, to above the horizontal center plane of the container 26 , like out 1 evident. The particulate material 12 is even at least partially up to the highest circumferential area of the container 26 transported. Part of the particulate material 12 flows due to the spacing of the vanes 36 from the container wall 28 again slightly back and mixes with the subsequent ascending part of the particulate Guts 12 , In the upper part of the container 26 then flows the estate 12 from the vanes to the return surface 42 on which it slopes down to the lower end 46 the return surface 42 slides. From the bottom 46 the return surface 42 the estate falls 12 then, under the action of gravity, move vertically downwards at the spray nozzle 64 past. In the area of the spray nozzle 64 forms the particulate material 12 a "particle curtain" 106 ( 2 ), in which the individual particles of the estate 12 come on gap spacing. In this area becomes the particulate material 12 with the coating medium 14 sprayed. After the particulate material 12 the spray nozzle 64 has passed in free fall, it returns to the bottom of the container 26 and gets off the vanes 36 after which a renewed change of the estate 12 starts from the beginning. The spraying of the particulate material 12 or the "particle curtain" 106 over its entire length relative to the longitudinal direction of the container 26 , like out 2 evident.

During the continuous upheaval and continuous spraying of the estate 12 with the coating medium 14 becomes process air according to the flow arrows 72 from the supply air duct 88 starting from the supply air chamber 76 through the container wall 28 through into the container 26 initiated, the process air flooded first the rising good. The process air flows through the estate 12 a second time on the return area 42 and in particular in the field of application of the coating medium 14 and then exits the container 26 through the air-permeable container wall 28 in the exhaust chamber 78 from, and is from this through the exhaust duct 90 from the device 10 led off. In the supply air chamber 76 the process air is guided by about 180 °, and also in the exhaust chamber 78 the process air is again guided by 180 °. In other words, the process air penetrates the left half of the container 26 and also the right half of the container 26 in a flowing by 180 ° flow movement.

As already related to 5 mentioned, the two process chamber halves, ie the supply air chamber can be 76 and the exhaust chamber 78 , disconnect each other to access the container 26 to obtain. The supply air chamber 76 and the exhaust chamber 78 are on a roller / rail system 108 respectively. 110 traversable.

Furthermore, in the device 10 within the process air chamber 74 , for example, at its four corners 111 . 113 . 115 . 117 , Liquid nozzles for a wet cleaning of the container 26 be provided in situ, wherein the process air chamber 74 , as in 1 is shown, at its lower end a gutter 112 forms for the discharge of the washing liquid.

In 3 and 4 is an emptying device 114 for emptying the finished product 12 from the container 26 shown. The emptying device 114 has a gutter 116 on that in the container 26 is einbringbar, and in the container 26 position so that they are in the longitudinal direction of the container 26 extends obliquely from top to bottom, as in 4 is shown.

The emptying of the particulate material 12 preferably takes place from the rotational movement of the container 26 out. Due to the fact that the vanes 36 the particulate material 12 steadily in the upper area of the container 26 take along and there the particulate good 12 from the vanes 36 flows out, there falls the particulate material 12 then into the gutter 116 and then flows along this outward into a collecting container, not shown. To intensify the emptying of the particulate material 12 is according to 3 provided that at least one, preferably a plurality of the guide vanes 36 are displaceable, so that these with the container wall 28 come into line or come to an end, as for a vane 118 in 3 is indicated, causing a backflow through the gap between the ends 38 the vanes 36 and the container wall 28 at these particular vanes 118 is prevented, whereby a faster emptying of the particulate Guts 12 from the container 26 is possible.

In 6 and 7 is one opposite the 1 to 5 modified embodiment of a device 130 are shown, of which only the features differing from the previous device will be described below. Furthermore, similar or identical features are provided with the same reference numerals with the previous device.

In the container 26 the device 130 is in addition to the return surface 42 another return surface 132 arranged, like the return surface 42 , preferably air-permeable, for example perforated. The return surface 132 is at the height of the spray nozzle 64 this arranged opposite, namely the axis of rotation 27 facing ends 40 adjacent, so that from the return surface 42 effluent good between the spray nozzle 64 and the further return surface 132 in the lower area of the container 26 falls back and partly on the return surface 132 passes, which extends substantially vertically and is preferably curved as shown. The further return area 132 avoids that, for example, under the action of the spray of the spray nozzle 64 that from the return area 42 sloping good 12 prematurely between the vanes 36 is moved. In the lower area of the further return area 132 meets the particulate material 12 on top of this and then gets in a gentle and gentle manner from the vanes 36 added.

The device 130 differs further from the device 10 by a differently designed process air device 134 , The process air device 134 again has a process air chamber which can be separated into two halves 136 on, but in a Zuluftkammer 138 and two exhaust air chambers, namely a first exhaust chamber 140 and a second exhaust chamber 142 , is shared. Corresponding lip seals 144 . 146 and 148 cause a corresponding airtight division of the individual chambers. The supply air chamber 138 surrounds the approximately lower left area of the container wall 28 , the first exhaust air chamber 140 the approximately left upper area of the container wall 28 and the second exhaust chamber 142 the approximately upper right area of the container wall 28 ,

The exhaust air chamber 140 and the exhaust chamber 142 are in this embodiment of the process air device 134 each associated with two independently adjustable, not shown exhaust fan. About the exhaust chamber 142 can the process air from the field of application of the coating medium 14 be sucked off, and with a higher suction, to which together with the coating medium 14 sprayed spray air can be spontaneously and effectively sucked off. Also in this embodiment of the process air chamber 136 a double flooding of the particulate Guts occurs 12 as with the device 10 ie both of the vanes 36 up taken good 12 that is on rising good 12 , as well as the returning from the upper region in the lower region Good, especially in the field of application of the coating medium 14 , is flooded by the process air.

Another change of the device 130 opposite the device 10 is that on the vanes 36 a plurality of guide elements 149 on the lifting side of the vanes 36 are arranged, which are the particulate material 12 when ascending also a component of movement in the longitudinal direction of the device 130 ie in the longitudinal direction of the container 26 to impose. The guiding elements 149 are accordingly not perpendicular to the longitudinal axis or axis of rotation 27 of the container 26 aligned, but run obliquely to it. The guiding elements 149 may furthermore preferably be adjustable in their inclination, and in particular the guide elements 149 on each adjacent vanes 36 be oriented in opposite directions to each other, a further mixture of the estate 12 in the longitudinal direction of the container 26 to achieve.

A mix of the good 12 in the longitudinal direction of the container 26 However, due to the inventive manner of moving the Guts 12 in the container 26 not essential to achieve a good work outcome.

Another difference between 6 and 1 is that with the same size of the vanes 36 the degree of filling of the device 130 is much lower than the degree of filling in 1 , Basically, it's like in 1 shown, possible, the container 26 up to the axis of rotation 27 facing ends 40 the vanes 36 to fill. A sufficient entrainment of the estate 12 through the vanes 36 in the upper area of the container 26 However, it is already achieved at a much lower degree of filling, as in 3 is shown.

In 8th this is another alternative in the form of a device 150 shown differing from the previous devices 10 and 130 characterized in that they are in the container 26 vanes 152 which is less far to the center of the container 26 extend as the vanes 36 of the devices 10 and 130 , With a corresponding filling of the container 26 with the particulate material 12 It will no longer be essentially the whole in the lower part of the container 26 moved back well 12 from the vanes 152 captured and in the upper area of the container 26 taken along, as with the devices 10 and 130 the case is, but it only becomes part of the bottom of the container 26 moved back from the vanes in the upper area taken. Part of the estate 12 always stays above the axis of rotation 27 facing ends 154 the vanes 152 in a rolling motion so that the spaces between the individual vanes 152 always completely with the good 12 are filled. But overall, less good 12 in the upper area of the container 26 is the "particle curtain" 106 in the field of application of the coating medium 14 even further diluted, because a certain volume of the estate 12 in the lower part of the container 26 dwells, but this remaining volume is steadily against Nachfließendes Good 12 exchanges, so that here too a very good mixing of the estate 12 is reached.

In 9 to 12 is finally another embodiment of a device 160 shown, different from the previous devices 10 . 130 and 150 with respect to the configuration of the guide vanes and the configuration of the process air device, as will be described in more detail below.

How out 9 and in particular 13 holding a single vane 162 in isolation and enlarged shows, are the vanes 162 formed as a hollow profile, wherein the hollow profile is similar in cross-section of an airfoil shape.

The vanes 162 are on their product-lifting side 164 as well as on the opposite side 166 process air permeable. However, it can also be provided that only one of these two sides is process air permeable, for example, the page 164 , How out 13 it can be seen, in the embodiment shown, the guide vanes 162 formed as perforated sheets, but also single or Mehrschichtsiebgewebe and the like as a material for the vanes 162 can be considered.

At their longitudinal ends are the vanes 162 with side walls 168 and 170 as previously welded, for example, but the side walls 168 . 170 in the area of the vanes 162 with corresponding opening cross sections 172 and 174 Mistake.

The vanes 162 can instead of using the sidewalls 168 . 170 welded also be designed as plug-in parts, with appropriate means on the side walls 168 and 170 detachably fastened.

The vanes 162 serve in this embodiment accordingly as Zuluft- or exhaust air ducts for the process air and therefore provide a part of a process air device 176 dar. The process air device 176 has a supply air chamber 178 and an exhaust chamber 180 on (cf. 11 ), wherein the -Zuluftkammer 178 and the exhaust chamber 180 altogether as an annular chamber 182 on the side wall 170 is trained. A corresponding supply air duct 184 is with the supply air chamber 178 and a corresponding exhaust duct 186 with the exhaust air chamber 180 connected. The supply air chamber 178 is from the exhaust chamber 180 through four seals 188 to 194 separated, each in pairs a lock 195 . 197 form, which ensures that the supplied process air from the supply air chamber 178 not in the exhaust chamber 180 can pass without first passing through the vanes 162 and about this through the estate 12 to have flowed, or that when passing a vane 162 this is simultaneously supplied with supply air and exhaust air. The width of the locks 195 . 197 is equal to the width of the vanes 162 ,

On the side wall side 168 is a corresponding annular channel 196 arranged over which the individual vanes 162 process air can communicate with each other, whereby an improved process air flow rate is achieved. In passing every single vane 162 at the supply air duct 184 or at the supply air chamber 178 process air enters the vanes 162 blown, occurs through their pages 164 and 166 out, flooded the estate first on its rise from the bottom of the container 161 in the upper area and then a second time when the estate flows back 12 from the upper area to the lower area of the container 161 and escapes from there again via the guide vanes 162 in the exhaust chamber 180 and from there into the exhaust duct 186 ,

In this embodiment of the process air device 176 is the container wall 163 of the container 161 prozeßluftundurchlässig. The container wall 163 can be made of individual removable parts, for example, four individual removable parts.

The embodiments of the process air device 176 and the process air facility 70 respectively. 134 of the devices 10 . 130 or 150 can also be combined with each other. For example, the supply air via the trained as a hollow profile vanes 162 take place while the exhaust air in principle via a corresponding process air permeable container wall 28 of the container 26 escapes and vice versa.

Claims (16)

Device for treating a particulate product ( 12 ) with a coating medium ( 14 ), in particular for coating pharmaceutical, food, technical or chemical products, with a container ( 26 ; 161 ), which is about a horizontal or oblique axis of rotation ( 27 ) is rotatable and a the axis of rotation ( 27 ) surrounding container wall ( 28 ; 163 ), further comprising a spraying device ( 62 ) for spraying the estate ( 12 ) with the coating medium ( 14 ) in the container ( 26 ; 161 ), and with a process air device ( 70 ; 134 ; 176 ) for supplying the estate ( 12 ) with process air, wherein in the container ( 26 ; 161 ) circumferentially distributed and the container wall ( 28 ; 163 ) adjacent a plurality of spaced apart vanes (FIG. 36 ; 152 ; 162 ) are arranged, which from the axis of rotation ( 27 ) and seen in the direction of rotation to the container wall ( 28 ; 163 ) are arranged sloping obliquely so that they are able to at least a part of the particulate Guts ( 12 ) in the upper area of the container ( 26 ; 161 ) and substantially over the entire length of the container ( 26 ; 161 ) and with the container ( 26 ; 161 ), characterized in that the guide vanes ( 36 ; 152 ; 162 ) at its the container wall ( 28 ; 163 ) facing end ( 38 ) from the container wall ( 28 ; 163 ), whereby in each case a passage gap between the container wall ( 28 ; 163 ) and the end of a respective vane ( 38 ). Device according to claim 1, characterized in that in the container ( 26 ; 161 ) a stationary return surface ( 42 ) for the estate ( 12 ) which extends from an upper region of the container ( 26 ; 161 ) extends obliquely outwards and downwards with respect to the vertical, wherein an upper end ( 44 ) of the return surface ( 42 ) of the axis of rotation ( 27 ) facing ends ( 40 ) of the guide vanes ( 36 ; 152 ; 162 ) is adjacent. Apparatus according to claim 2, characterized in that the return surface ( 42 ) approximately at the level of a horizontal median plane of the container ( 26 ; 161 ) ends. Apparatus according to claim 2 or 3, characterized in that the spraying device ( 62 ) at least one spray nozzle ( 64 ), which in the lateral distance to the lower end ( 46 ) of the return surface ( 42 ) is arranged below it. Apparatus according to claim 4, characterized in that the at least one spray nozzle ( 64 ) a linear gap nozzle with a nearly over the entire length of the container ( 26 ; 161 ) extending spray gap. Apparatus according to claim 4 or 5, characterized in that the spray nozzle ( 64 ) opposite a further, substantially vertically extending return surface ( 132 ) is arranged, that of the axis of rotation ( 27 ) facing ends ( 40 ) of the guide vanes ( 36 ; 152 ; 162 ) is adjacent. Device according to one of claims 1 to 6, characterized in that the container ( 26 ; 161 ) two side walls ( 30 . 32 ; 168 . 170 ) between which the guide vanes ( 36 ; 152 ; 162 ) are arranged, and that the side walls ( 30 . 32 ; 168 . 170 ) at the axis of rotation ( 27 ) facing end ( 40 ) of the guide vanes ( 36 ; 152 ; 162 ) each have an inward projection ( 58 . 60 ) exhibit. Device according to one of claims 1 to 7, characterized in that the container wall ( 28 ) of the container ( 26 ) is permeable to air, and that the process air device ( 70 ; 134 ) a process air chamber ( 74 ; 136 ), which the container wall ( 28 ), wherein the process air chamber ( 74 ; 136 ) in a supply air chamber ( 76 ; 138 ) and at least one exhaust air chamber ( 78 ; 140 . 142 ) is shared. Apparatus according to claim 8, characterized in that the at least one exhaust air chamber ( 78 ; 140 . 142 ) is associated with an exhaust fan, which by a Zuluftgebläse for Zuluftkammer ( 76 ; 138 ) is independently adjustable in performance. Apparatus according to claim 8 or 9, characterized in that the process air chamber ( 136 ) at least two exhaust air chambers ( 140 . 142 ) having, and that both exhaust air chambers ( 140 . 142 ) can be acted upon with different suction strengths. Device according to one of claims 1 to 10, characterized in that the guide vanes ( 162 ) are formed as at least partially air-permeable hollow profiles, the NEN as Zuluft- or exhaust air ducts for the process air, and that the process air device ( 176 ) at least on a side wall of the container ( 161 ), preferably on both side walls ( 168 . 170 ), a supply air chamber ( 178 ) and an exhaust air chamber ( 180 ) having. Device according to one of claims 1 to 11, characterized in that the return surface ( 42 ) and / or possibly the further return surface ( 132 ) are permeable to air. Device according to one of claims 1 to 12, characterized in that on the guide vanes ( 36 ) on its lifting side laterally inclined guide elements ( 149 ) to move the estate ( 12 ) in the longitudinal direction of the container ( 26 ) are arranged. Device according to one of claims 1 to 13, characterized in that the guide vanes ( 36 ; 152 ; 162 ) relative to the longitudinal axis of the container ( 26 ; 161 ) are inclined, preferably by vane ( 36 ; 152 ; 162 ) to vane ( 36 ; 152 ; 162 ) with opposing inclination. Device according to one of claims 1 to 14, characterized in that an emptying device ( 114 ) for emptying the finished product ( 12 ) from the container ( 26 ), one in the container ( 26 ) insertable channel ( 116 ), which extends in the longitudinal direction of the container ( 26 ) extends obliquely from top to bottom. Apparatus according to claim 15, characterized in that at least one of the guide vanes ( 118 ) for emptying the estate ( 12 ) in conclusion with the container wall ( 28 ) is displaceable.