WO2012098131A1

WO2012098131A1 - Method and device for separating out contaminants from a pneumatic fibre stream

Info

Publication number: WO2012098131A1
Application number: PCT/EP2012/050664
Authority: WO
Inventors: Fritz Schneider
Original assignee: Dieffenbacher GmbH Maschinen- und Anlagenbau
Priority date: 2011-01-17
Filing date: 2012-01-17
Publication date: 2012-07-26
Also published as: EP2665565A1; DE102011008757A1; CN103313802A

Abstract

The invention relates to a method and a device for separating out contaminants in the form of coarse material (10) from a pneumatic fibre stream (4) intended for producing fibre boards, wherein the fibre stream is divided into a separating air stream (25), which merely contains air and normal material (9) consisting of fibres, and a main fibre stream (22), containing the coarse material (10) and normal material (9), by using centrifugal force, in that the fibre stream (4) undergoes a curvature (12), wherein the main fibre stream is conducted in an outer region (13) of the curvature and the separating air stream is sucked away in an inner region (20) of the curvature, wherein the main fibre stream is fed to a separating roller (23), which has a multiplicity of pins (24) on its surface and rotates in such a way that the impinging coarse material and normal material is deflected and conducted along a shaft portion (33) and the normal material is accelerated to approaching the circumferential speed of the roller in such a way that some of the normal material leaves the effective range of the roller with a horizontal movement component, wherein some of the normal material is sucked away through a suction removal line (40) and some of the normal material and the coarse material enter a drop shaft (37) and from the latter enter an air classifier unit (2), wherein at least some of the separating air stream is fed to the air classifier unit in such a way that it acts on the normal material and coarse material arriving from the drop shaft (37) and deflects the normal material into a normal-material suction removal shaft (43), while the coarse material enters a coarse material discharge (54). The method and the device can be integrated in an existing transporting line.

Description

Method and apparatus for prospecting for contaminants from a pneumatic fiber stream

The invention relates to a method and an apparatus for the prospect of impurities in the form of coarse material from a for the production of

Fiber boards provided, pneumatic stream of fibers. In which

Fiber flow, which may for example come from a dry gluing, it is a pneumatic flow, which is generated by negative pressure. The fibers are preferably lignocellulosic and / or

cellulosic materials. The fiberboards are lightweight, medium density (MDF) and high density (HDF) fiberboard.

In known Sichtungsverfahren, as for example in the

DE 197 18 158 A1, WO 92/05882 and WO 01/89783 A1 are disclosed, the separator is integrated into a fiber-free air flow. The fiber material is fed to the classifier via external, mechanical conveying elements. The disadvantage here is that the fiber material, which is process-related before the sighting always in an air flow, for example in a pipe dryer, must be passed to the mechanical conveying elements in a previous step. This step requires costly

Facilities, such as one or more air-fiber separator with

Rotary valves, conveyor belts, dosing bins and ancillary equipment. The expense of these facilities contributes significantly to the operating costs and reduces the reliability.

Furthermore, in the known screening methods or classifiers, the entire fiber material is subjected to the sighting. It is disadvantageous that because of the lightweight and therefore voluminous fiber material correspondingly large and thus expensive visual systems are required to produce a high resolution of the fiber material. High resolution is the prerequisite for effectively estimating the relative low level of impurities, i. Foreign particles or heavy particles, in the form of coarse material. The proportion of coarse material is approximately 0.01% in relation to that of fibers

existing normal good.

The invention has for its object to provide a method for the screening of fiber material, wherein the sighting is integrated into a fiber-guiding air flow. Furthermore, the invention has for its object to provide a device that can be integrated into a fiber-guiding air flow.

The object concerning the method is solved by the features of claim 1. The fiber stream is guided along a curve. This splits the fiber stream into a stream called the sighting air stream and a stream called the main fiber stream. The Sichtungsluftstrom contains apart from air only normal, which consists of fibers. The main fiber stream contains this Coarse material and at least part of the normal good. In the division of the fiber flow, the centrifugal force is exploited, which causes the main fiber flow is guided in an outer region of the curvature.

By contrast, the sighting air stream is sucked off at an inner region of the curve, that is to say where there is no coarse material and as a rule only a small amount of normal material.

The main fiber stream is fed to a separation roller which is provided on its surface with a plurality of pins. It rotates in such a way that the coarse material or normal material impinging on the roller is deflected by the pins and guided along a shaft section. This

Shaft section is formed by a portion of the roll circumference and an opposite wall. The normal good is by the pins and an airflow generated by this to approximately the

Circumferential speed of the separation roller accelerated so that a part of the normal material leaves the sphere of action of the separation roller with a horizontal component of movement. The separation roller can rotate at a peripheral speed of 10-80 m / s, preferably 50 m / s. At least one suction line is provided which has an inlet opening arranged opposite the shaft section. Part of the

Normal good is sucked through this at least one suction line. The entire coarse material, however, and a further part of the normal get into a chute below an outlet opening of the

Chute section is arranged. After passing through the chute, the normal product and the coarse material pass into a wind sifter unit.

At least part of the sighting airflow is used for the

Wind classifier to be supplied. This is done under a related to the coming out of the chute coarse and normal blunt angle. The Sichtungsluftstrom has such a strength that through him coming from the chute normal, which has a substantially vertical component of motion, is redirected, in a Normalgutabsaugschacht into about the continuation of

Direction of movement of the entering into the classifier Sightungsluftstroms is arranged. Furthermore, the strength of the sighting air flow is such that, on the other hand, the coarse material is not significantly influenced by the sighting air flow in its likewise essentially vertical direction of movement and reaches a coarse material discharge.

In this way, the sighting process, the fiber material to be viewed can be supplied via the air, which is basically provided for transporting the fibers. Compared to the above-described prior art, it eliminates extensive and expensive equipment. As a result, the facilities are a complete pneumatic transport system, since the fibers need not be fed to the screening process via an external, mechanical conveyor.

Preferably, the division into the main fiber stream and the

Sighting air flow influenced by one or more adjustable means. These means may in particular be a regulating flap or a slide which is arranged in the region of the division of the fiber flow. In this context, the strength of the applied negative pressure also plays a role, which significantly influences the speed of the fiber flow within the bend. This speed may be in the range of 10-60 m / s, preferably 25 m / s.

Even if the chute is vertically aligned, the coarse material, which is pressed in the chute section due to the acting centrifugal force against the wall, within the chute in the

Move substantially along a wall of the chute, when this wall forms a vertical continuation of the wall of the chute section. This is due to the fact that the coarse material consists of relatively heavy particles, so that the acting gravity against the

Suctioning force clearly dominates. Preferably, this wall of the chute is inclined, with an angle in the range of 25 to 35 degrees is advantageous. This reinforces the effect that the coarse material in the

Essentially near this wall of the chute in the

Wind classifier enters, while normal goods across the entire width of Fall shaft enters the wind sifter unit. A movement of the

Coarse material along this wall is advantageous because near the inner wall there is a vortex-free zone of the chute. In this way, the separation between coarse and normal material is supported in the wind sifter unit, namely by the coarse material with a certain distance from a

Entry opening of the Normalgutabsaugschachtes by the wind sifter unit falls.

Furthermore, it is preferably provided that the chute has a significantly larger cross-section than the chute section. These

Cross-sectional change at the transition from the shaft section to the chute leads to an abrupt slowdown of the air speed. This causes the emerging from the shaft section thin stream of normal, ie fibers fanned out and continues in the chute as falling stream. Because the fibers are due to their low weight of

Adjust air velocity and the fan-like flow profile, while the coarse material, so the heavy particles, but hardly

slow down and its predetermined by the separation roller direction is maintained. This results in a significant speed difference between the normal and the coarse material and a difference in the flow direction of the normal and the coarse material.

Preferably, the main fiber flow within the shaft section only has a thickness of 1 -3 mm. This can be done by an appropriate Dimensioning of the separation roller in relation to the fiber volume can be achieved.

Preferably, a portion of the sighting air flow is not in the

Wind sifter unit led, but past this in the

Normalgutabsaugschacht or an extension line of this shaft. This allows a regulation of the flow conditions in the

Wind classifier can be achieved.

Furthermore, preferably, the single or one of the plurality of suction lines is arranged so that its inlet opening adjacent to a lower portion of the separating roller, e.g. at the lowest point of the

Separation roller, is provided. This allows a particularly effective extraction of normal material can be achieved. Because of the number of pins, the separating roller generates a rotating air flow profile, which is supported by the suction. As a result, a considerable part of the normal material passes into the suction, while the heavy particles of the coarse material do not follow the sudden deflection due to their higher kinetic energy. The proportion of extracted normal good depends on the amount of air that is supplied to the chute or withdrawn. To the best possible separation of the main fiber stream in coarse material and

To achieve normal material within the pre-treatment unit, almost the same amount of air that is fed together with the main fiber stream the chute, or possibly also a slightly larger Luftmange sucked through the suction from the chute. The inlet opening of the suction line can also be arranged below the separating roller. It is also possible to provide a second or third suction line with an inlet opening arranged opposite the shaft section. The second and third suction can with their inlet below the first suction or the

Be arranged inlet. Through this further suction can Normalgut, which has not been detected by the first suction and is in the falling stream to be sucked. Then remaining normal material enters the wind sifter unit. The goal is as much as possible

Absorb normal goods, so as little as possible normal for the

Windlass unit remains. The coming from the air classifier normal is usually with the through the at least one suction line

merging normal good merged.

Preferably, the inventive method is integrated into one

pneumatic transport route, which consists of transporting the fibers from one location to another desired location.

The above object is with respect to the device by the

Characteristics of claim 8 solved. The device has a portion of a transport line which serves to pneumatically transport the fiber stream. For this purpose, the transport line is connected to at least one fan, which generates a negative pressure in the transport line and is preferably frequency-controlled for adjusting the suction power. Of the Transport line section has a curvature. In an outlet region of the curvature, ie in a curvature outlet section or in a subsequent adjacent transport line section, the transport line divides into a line referred to below as the fiber main line and a line designated as air secondary line. With others

In words, the division takes place in the end region of the curvature or shortly thereafter. The air bypass begins at an inner portion of the bend, i. immediately in the course of or adjacent to the inner curvature region, when the branch occurs just past the end region of the curvature. The air bypass is arranged so that taking advantage of the centrifugal force through them only a part of the normal

is sucked off. This fiber stream will be according to the above

described method as Sichtungsluftstrom. It preferably contains as little normal as possible.

The Fiber Main has its origin at an outer one

Curvature area, i. immediately in the course of the outer

Curved portion or adjacent to this, when the branch is done just behind the end portion of the curvature. The fiber main line carries a coarse and normal material containing fiber stream, which is referred to as the main fiber stream according to the method described above. The fiber main extends to an outlet port located above a separation roller. The separating roller points at her Surface on a plurality of pins and is rotatable so that the impacting on the roller coarse material or normal material is deflected by the pins and fed to a manhole section. The manhole section is defined by a section of the circumference of the separating roll and a

bounded opposite wall and extends in the direction of rotation of the separating roller from the outlet opening of the fiber main line to an outlet opening which is arranged in a lower region of the separating roller. The rotation of the roller is further designed so that the normal material through the pins and an air flow generated by them to approximately the peripheral speed of the separating roller so

it is accelerated that part of the normal material leaves the area of action of the separating roller with a horizontal component of movement.

At least one suction line is provided which has an inlet opening arranged opposite the shaft section. Part of the

Normal good is sucked through this at least one suction line.

Below the outlet opening of the shaft section, an inlet opening of a chute is arranged. This opens into a wind sifter unit. The air bypass is designed to cover at least part of the

Sighting air flow leads to the wind sifter unit, in such a way that it acts at an obtuse angle on the coming out of the chute normal and coarse material and thus the normal is deflected into a Normalgutabsaugschacht, which is arranged approximately in continuation of the direction of the supplied sighting air flow. Below the area of the normal goods diversion a coarse material discharge is arranged. This serves to accommodate the coarse material, which in its direction of movement is not significantly influenced by the sighting air flow.

With the device, the inventive method can be performed. The device has substantially the same advantages as previously described in connection with the method. This also applies to the preferred embodiments of the device described below.

Preferably, one or more adjustable means are arranged such that, by appropriate adjustment of the means, the division into the main fiber flow and the sighting air flow can be adjusted. The means, which may be in particular a butterfly valve or a slide, for example, where the transport line divides into the fiber main line and the air bypass, be appropriate. The wall of the shaft section preferably passes directly into a wall of the chute. This is the wall on the side from which the sighting air flow led into the wind sifter unit becomes. The chute is preferably inclined, the inclination preferably being 25 to 35 degrees.

It is also advantageous if the chute has a significantly larger cross-section than the chute section.

Preferably, a said suction line is provided so that their

Inlet opening is arranged adjacent to a lower portion of the separation roller, wherein it can be located in particular at the level of the lowest point of the separation roller. The inlet opening of the suction line can also be arranged below the separating roller. There may also be a second or third suction with a respect to the

Chute section arranged inlet opening may be provided. The second and third suction line can be arranged with its inlet opening below the first suction line or its inlet opening.

The at least one suction line and the Normalgutabsaugschacht the air classifier are usually, but not necessarily connected to each other.

It can branch off a bypass line from the air bypass and open, bypassing the wind sifter unit in the Normalgutabsaugschacht. Preferably, the device according to the invention is integrated in one

pneumatic transport line provided to transport the fibers from one location to another desired location, for example, from a dry fiber sizing apparatus to a forming machine. The device according to the invention and the method according to the invention can be referred to as an inline classifier or as an inline screening method.

In the following the invention will be explained in more detail with reference to an exemplary embodiment, reference being made to the single figure, which shows schematically a device according to the invention. The device according to FIG. 1 is a device for the prospect of

Impurities in the form of coarse material 10 from a provided for the production of fiberboard, pneumatic stream of fibers. The device consists of a pre-treatment unit 1 and a wind sifter unit 2. The device has a transport line section, which has a

pneumatic fiber stream 4 in the direction of arrow 5 leads. Two fans 6 and 7 are connected to the transport line and generate a negative pressure in this.

The fiber stream 4 is fed from a device, not shown, e.g. may be a Trockenfaserbeleimungsvorrichtung sucked. There are also impurities in the form of relatively heavy particles between the fibers representing the normal material 9, which are referred to below as coarse material 10. The transport line section 3 describes a

Curvature 12. The curvature 12 is formed so that the out of the Normalgut 9 and the coarse material 10 existing fiber stream 4, which moves in the transport line section 3 at a speed of 10 - 60 m / s, preferably 25 m / s, by the action of the curvature 12 acting centrifugal force to an outer region or outer

Curvature edge applies.

In the outlet region of the curvature 12 is a designated as a current divider 15 branch line. The flow divider 15 could also be located slightly behind the end of the curve 12, but before it is in the

Transport line would come again to a broadening of the fiber stream 4. The flow divider 15 divides the transportation line section 3 into a branch, which is referred to below as the main fiber line 16, and a branch, which is referred to as air bypass 17. For this purpose, the flow divider 15 has a control flap 19.

The fiber main 16 begins at an outer portion of the bend 12 by the outer region 13 merges into the fiber main line 16. The air bypass 17 begins at an inner portion of the bend 12 by an inner portion 20 of the bend 12 merges into the air bypass 17. Through the main fiber line 16 passes a main fiber stream 22, which contains the entire coarse material 10 and almost all fibers as normal material 9, on a separating roller 23, on the surface of a plurality of nail-like pins 24 is attached. Through the air bypass 17 almost fiber-free air, which is referred to below as the sighting air flow 25, sucked by the fan 6 and fed as transport air at an obtuse angle in the direction of arrow 26 of the wind sifter unit 2. Part of this air is used to regulate the flow conditions in the wind sifter unit 2 through a bypass line 27, which has a control flap 28, on the wind sifter unit 2

past.

The separating roller 23 rotates in the direction indicated by arrow 30

Direction of rotation with a peripheral speed of 10-80 m / s, preferably 50 m / s. The separating roller 23 has a variable-speed drive. A portion of the separation roll periphery and a wall 32 define a well portion 33 that extends approximately from an exit port 34 of the fiber main 16 to the lowest point of the separation roll 23 and has an exit port 35 therein. With the outlet opening 35 of the shaft portion 33 opens into a chute 37, the one

Inlet opening 38 has and a connection between the

Pre-treatment unit 1 and the wind sifter unit 2 forms. The separating roller 23 serves to accelerate both the normal and the coarse material in the main fiber stream 22 to the peripheral speed of the separating roller 23 and to let the main fiber stream 22 emerge from the outlet opening 35 in this state. Of the Shaft portion 33 has a curvature 39, which is slightly larger than the curvature of the separating roller 23 and is designed so that the main fiber flow 22 by applying acting in the curvature 39 centrifugal force against the wall 32 applies. The separating roller 23 is dimensioned in proportion to the fiber volume so that the

High-speed main fiber stream 22 in the manhole section 33 only has a thickness of 1 to 3 mm. By in their position

variable control valve 19 of the flow divider 15, the amount of air can be adjusted, which through the fiber main line 16 together with the

Main fiber stream 22 of the separation roller 23 is supplied.

A suction line 40 having an inlet opening 41, which at the height of the lowest point of the separating roller 23 and against the

Shaft section 33 is arranged, opens into an extension 42 of a Normalgutabsaugschachtes 43. At the confluence a control slide 45 is arranged to control the amount of air to be sucked.

In a transition region 47 from the shaft section 33 to the

Chute 37 is a relatively large change in cross section with respect to the main fiber stream 22 available space. These

Cross - sectional change leads to an abrupt slowdown in growth

Air velocity, which causes the thin main fiber stream 22 exiting the well section 33 to fan out and partially continue in the chute 37 as a falling stream. The fibers of the normal 9 are to adapt as light particles of this air velocity and the fan-like flow profile, while the coarse material 10 but hardly slows down and their will be maintained by the predetermined by the separating roller 23 direction. This results in a significant speed difference between the normal product and the coarse material 10 and a

The chute 37 has an inclination of approximately 30 °, which causes the coarse material 10 to rest on an inner wall 49 of the chute 37 and in an inner wall 49 adjacent, swirl-free zone 50 of the chute 37 slide down.

At an outlet 51 of the chute 37, the wind sifter unit 2 connects. This has a Grobgutaustrag 54 with a rotary valve 55 below the confluence of the Sichtungsluftstroms 25 and an inlet 52 of the Normalgutabsaugschachtes 43.

The separation of the coarse material 10 from the normal material 9 takes place as follows: The separating roller 23 generates by the plurality of pins 24, a rotating air flow profile, by the through

Fan 7 suction generated in the suction line 40 is supported. As a result, a considerable part of the normal material passes into the suction line 40. The coarse material 10 is due to its higher kinetic energy no

Redirection experienced in the suction line 40 into it. The proportion of extracted by the suction line 40 normal goods depends on the amount of air that is fed to the chute 37 and withdrawn. To one as possible to achieve optimal separation of the main fiber stream 22 in coarse material 10 and normal within the pretreatment unit 1, almost the same amount of air is supplied to the chute 37 together with the main fiber stream 22, or possibly a slightly larger Luftmange through the suction line 40 from the chute 37th aspirated. Below the suction line 40, a second and third suction line could be additionally provided, is sucked through the normal, which has not been detected by the suction line 40 and is in the falling stream. The consisting of heavy particles coarse material 10 passes together with remaining normal at the outlet 51 of the chute 37 in the

Windscreen unit 2.

The operation of the wind sifter unit 2 is known to be that the normal material is deflected by the Sichtungsluftstrom 25 and the transport stream in the Normalgutabsaugschacht 43 inside, while the coarse material 10 due to their higher kinetic energy such deflection does not experience and get into the Grobgutaustrag 54. According to the invention, the aim is to obtain as many normal items as possible through the at least one

Suction line 40 to suck, so as little as possible normal for the

Wind classifier unit 2 remains. The separation roller 23 also has the positive side effect of dissolving fiber agglomerates, which greatly contributes to better sighting. (PP1098) List of Reference Numerals: PP 1098

1 Pre-treatment unit 28 Control flap

2 wind sifter unit 25 30 arrow

3 transport line section 31 subsection

4 fiber flow 32 wall

5 arrow 33 shaft section

6 fan 34 outlet opening

7 Fan 30 35 Outlet opening

9 Normal goods 37 Chute

10 coarse material 38 inlet opening

12 curvature 39 curvature

13 outer area 40 suction line

15 conductor 35 41 inlet opening

16 Fiber Main 42 Extension

17 Air bypass 43 Normal exhaust duct

19 Control flap 45 Control slide

20 inner area 47 transition area

22 main fiber flow 40 49 inner wall

23 separating roller 50 non-vortical zone

24 pins 51 spout

25 Sighting airflow 52 Inlet

26 arrow 54 Coarse material discharge

27 Bypass pipe 45 55 Rotary valve

Claims

claims

A process for prospecting coarse material contaminants (10) from a fiber-generated pneumatic fiber stream (4) for producing fiberboard, the fiber stream (4) entering a stream of sighting air (25) comprising only air and fibers existing normal material (9), and a coarse (10) and normal (9) containing main fiber stream (22) is divided by utilizing the centrifugal force by the fiber stream (4) undergoes a curvature (12), wherein the main fiber stream (22) in an outer region (13) of the curvature (12) is guided and the Sichtungsluftstrom (25) at an inner region (20) of the curvature (12) is sucked,

wherein the main fiber stream (22) is fed to a separation roller (23) having on its surface a plurality of pins (24) and rotating so that the coarse material (10) and the normal material (9) are deflected by the pins (24) and bounded along one by a portion (31) of the periphery of the separation roller (23) and an opposite wall (32)

Manhole section (33) are guided and that the normal good (9) through the pins (24) and an air flow generated by this to approximately the peripheral speed of the separating roller (23) is accelerated so that a part of the normal good (9) the

Area of action of the separating roller (23) with a horizontal

Motion component leaves,

wherein a part of the normal good (9) by at least one

Suction line (40) with a relative to the shaft section (33) arranged inlet opening (41) is sucked,

wherein a part of the normal good (9) and the coarse material (10) in one

Chute (37) below an outlet opening (35) of the

Manhole section (33) and from the chute (37) in a

Wind sifter unit (2) arrive,

wherein at least part of the sighting air flow (25) is supplied to the wind sifter unit (2) such that it acts at an obtuse angle on the normal and coarse material (9, 10) coming from the chute (37) and thereby the normal good (9). in a arranged approximately in continuation of the direction of the supplied sighting air flow Normalgutabsaugschacht (43), while the coarse material (10) by the Sichtungsluftstrom (25) in his

Movement direction is not significantly affected and enters a coarse material discharge (54).

Method according to claim 1, characterized in that the division into the main fiber stream (22) and the Sighting air flow (25) by one or more adjustable means, for example a control flap (19) or a slide,

can be influenced.

Method according to claim 1 or 2,

characterized in that the coarse material (10) directly from the manhole section (33) to an inclined

Inner wall (49) of the chute (37) passes and moves along this to the wind sifter unit (2), wherein the

Wandungsneigung preferably 25 to 35 degrees.

Method according to one of the preceding claims,

characterized in that the from the

Well section (33) coming normal (9) in his

Speed is slowed down due to a much larger compared to the shaft section (33) cross section of the chute (37).

Method according to one of the preceding claims,

characterized in that the main fiber stream (22) within the chute section (33) has a thickness of 1 to 3 mm. Method according to one of the preceding claims,

characterized in that a said

Suction line (40) with a adjacent to a lower portion of the separating roller (23), e.g. at the level of the lowest point of the separation roller (23), arranged inlet opening (41)

is provided.

Method according to one of the preceding claims,

characterized in that a portion of the Sichtungsluftstroms (25), bypassing the wind sifter unit (2) in an extension (42) of the Normalgutabsaugschachtes (43) is guided

Apparatus for the prospect of impurities in the form of coarse material (10) from one for the production of fiberboard

provided, pneumatic fiber stream (4) of fibers, wherein the device has a transport line section (3) which is connected to at least one negative pressure generating fan (6,7) to pneumatically guide the fiber stream (4) in the transport line,

wherein the transport conduit section (3) has a curvature (12) and the transport conduit section (3) is in a discharge section the bend (12) or in an adjoining to the outlet section adjacent line section such in a fiber main line (16) which starts at an outer portion (13) of the bend (12), and an air bypass line (17) at an inner portion (20) of the bend (12), states that, by utilizing the centrifugal force through the air bypass (17), a stream of sighting air containing only air and fibers (9) is sucked while through the fiber main line (16) a coarse (10) and

Normalgut (9) containing main fiber stream (22) passes,

the main fiber conduit (16) extending to an outlet opening (34) above a separating roller (23) having on its surface a plurality of pins (24) and rotatable so that the coarse material (10) and the impinging coagulum Normal material (9) deflected by the pins (24) and guided along a section (31) limited by a section (31) of the circumference of the separating roller (23) and an opposite wall (32) shaft portion (33) extending from the outlet opening (34). the fiber main line (16) extends in the direction of rotation of the separating roller (23) and with an adjacent to a lower portion of the separating roller (23) arranged outlet opening (35) is provided, and that the normal by the pins (24) and a through this generated airflow to approximately the

Peripheral speed of the separating roller (23) is accelerated so that a part of the normal (9) the scope of the separating roller (23) with a horizontal

Motion component leaves,

wherein at least one suction line (40) is provided with an inlet opening (41) arranged adjacent to a lower area of the separating roller (23) and opposite the shaft section (33),

wherein below the outlet opening (35) of the shaft section (33) an inlet opening (38) of a chute (37) is arranged and wherein the chute (37) opens into a wind sifter unit (2) and the air secondary line (17) is designed, at least to guide a part of the sighting air flow (25) to the wind sifter unit (2) so that it acts at an obtuse angle on the normal and coarse material (9, 10) coming from the chute (37) and thereby the normal good (9) in an approximately in continuation of the direction of the supplied sighting air flow (25) arranged normalgut- extraction shaft (43) is deflected below the range of Normalgut-deflection a Grobgutaustrag (54) for receiving in its direction of movement not substantially by the

Sighting air flow (25) influenced coarse material (10) is arranged. Apparatus according to claim 8, characterized in that one or more adjustable means, for example a

Regulating flap (19) or a slider, are arranged so that through them the division into the main fiber stream (22) and the Sichtungsluftstrom (25) can be adjusted.

Device according to claim 8 or 9,

characterized in that the wall (32) of the shaft section (33) passes directly into an inner wall (49) of the chute (37).

11. Device according to one of claims 8 to 10,

characterized in that the chute (37) has a slope, preferably from 25 to 35 degrees.

12. Device according to one of claims 8 to 11,

characterized in that the chute (37) has a significantly larger cross-section than the chute section (33). 13. Device according to one of claims 8 to 12,

characterized in that a said

Suction line (40) with an adjacent to a lower portion of the Separation roller (23), for example, at the level of the lowest point of the separation roller (23), arranged inlet opening (41) is provided.

Device according to one of claims 8 to 13,

characterized in that a bypass line (27) is provided, which branches off from the air bypass (17) and, bypassing the wind sifter unit (2) in an extension (42) of the Normalgutabsaugschachtes (43) opens.

Device according to one of claims 8 to 14,

characterized in that it is integrated in a transport path which serves to transport the fibers from one location to another location.