WO1992005882A1 - Method and device for separating heavy particles from a particulate material - Google Patents

Method and device for separating heavy particles from a particulate material Download PDF

Info

Publication number
WO1992005882A1
WO1992005882A1 PCT/SE1991/000603 SE9100603W WO9205882A1 WO 1992005882 A1 WO1992005882 A1 WO 1992005882A1 SE 9100603 W SE9100603 W SE 9100603W WO 9205882 A1 WO9205882 A1 WO 9205882A1
Authority
WO
WIPO (PCT)
Prior art keywords
flow
directed
settling chamber
inlet
air
Prior art date
Application number
PCT/SE1991/000603
Other languages
French (fr)
Inventor
Ola Larsson
Stig Lennartsson
Original Assignee
ABB Fläkt AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ABB Fläkt AB filed Critical ABB Fläkt AB
Publication of WO1992005882A1 publication Critical patent/WO1992005882A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N1/00—Pretreatment of moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B4/00—Separating solids from solids by subjecting their mixture to gas currents
    • B07B4/02—Separating solids from solids by subjecting their mixture to gas currents while the mixtures fall

Definitions

  • the present invention relates to a method for sepa ⁇ rating heavy particles, such as lumps of glue, from a particulate material, such as glue-coated wood fibres, which is pneumatically conveyed from a first station, such as a container, to a second station, such as a plant for making fibreboards, said particulate material being introduced in a settling chamber to which a carrier air flow is supplied for entraining the particulate material while heavy particles contained therein fall to the bottom of the settling chamber, said particulate material being introduced in the settling chamber as a downwardly- directed flow of material through a downwardly-directed chamber inlet and leaving the settling chamber in an upwardly-directed flow of material and air through a cham ⁇ ber outlet located beside said inlet.
  • the invention also concerns a device for separating heavy particles from a particulate material.
  • glue-coated wood fibres are pneumatically conveyed, first from a drying plant to a collecting container, and from there to a forming station, where the fibres are spread as a mat on a wire through which the carrier air is drawn off. Then, the fibre mat is compressed into fibreboards under set pressure and tem ⁇ perature conditions.
  • One object of the present invention is, therefore, to provide a method which makes it possible to utilise a relatively small carrier air flow in the separation and, consequently, to perform the separation during the trans ⁇ port of the wood fibres from the container to the forming station.
  • this object is achieved by a method which is of the type stated by way of intro- duction and which is characterised in that compressed-air jets, which are directed obliquely towards the downwardly- directed flow of material, are blown into the settling chamber to decelerate the flow of material and to spread it in its transverse direction towards the outlet, and that the carrier air flow is blown into the settling cham ⁇ ber to encounter from below the decelerated, transversely spread flow of material so as to form therewith said flow of material and air.
  • Another object of the invention is to provide a suit ⁇ able device for implementing the method.
  • this object is achieved by a device which has a settling chamber with a down- wardly-directed inlet for said material and an upwardly- directed outlet located beside said inlet, and which is characterised by a first means for blowing compressed-air jets obliquely towards the downwardly-directed inlet, and a second means for blowing an upwardly-directed carrier air flow into the settling chamber on a level below said first means.
  • the illustrated device is arranged between a con ⁇ tainer (not shown) holding glue-coated wood fibres, and a forming station (not shown) where thin fibreboards are shaped. Further, the device has a settling chamber 1 with a downwardly-directed inlet 2 for supplying the material and an upwardly-directed outlet 3 for discharging the material, the outlet 3 being located beside the inlet 2. Moreover, the inlet 2 communicates with the container from which glue-coated wood fibres are introduced in the settling chamber 1 in the form of a downwardly-directed flow of material Fl.
  • the container preferably is a meter ⁇ ing container which is placed directly on the settling chamber 1 and distributes the flow of material Fl over the entire cross-section of the inlet 2.
  • the outlet 3 communicates with the forming station by means of an upwardly-directed trnsport pipe 4 of upwardly decreasing cross-sectional area.
  • the pipe 4 In its upper portion, the pipe 4 has a 180° bend 4a and, after the bend, branches into two separate conduits 4b and 4c.
  • the conduit 4b leads to the forming station.
  • the device further has an inlet 5 through which a carrier air flow F2 is blown into the lower portion of the settling chamber 1.
  • Adjustable guide rails 6 are provided in the inlet 5 to distribute the carrier air flow over the entire settling chamber 1.
  • a discharge trough 8 is provided at the bottom of the settling chamber 1, and a conveyor screw 9 is arranged in the trough 8 to discharge heavy particles collected therein.
  • the inlet 2 has a perforated metal sheet 10 which is inclined about 50° to the hori ⁇ zontal plane.
  • the sheet 10 is formed with a plurality of perforations which are distributed across the sheet surface and through which the settling chamber 1 communi- cates with a blow box 11.
  • Compressed-air jets S which owing to the inclination of the sheet 10 are directed obliquely upwards, i.e. obliquely towards to the down ⁇ wardly-directed flow of material Fl, are blown into the settling chamber 1 to decelerate the flow of material and to spread it horizon ⁇ tally towards the outlet 3.
  • Glue-coated wood fibres containing impurities in the form of comparatively heavy particles, such as lumps of glue and chips, are, as mentioned earlier, introduced in the settling chamber 1 in the form of a downwardly-direct ⁇ ed flow of material Fl which preferably is spread over the entire cross-section of the inlet 2.
  • the flow of material encounters the compressed-air jets S, and is thus dece ⁇ lerated and spread over the entire cross-section of the settling chamber 1.
  • the carrier air flow F2 supplied through the inlet 5 entrains the particulate material in a flow of material and air F3 through the outlet 3 and the transport pipe 4, while heavy particles fall down into the trough 8 to be discharged by the conveyor screw 9.
  • the carrier air flow can be considerably reduced compared with that required in the prior-art separation method described by way of introduction. This effect is further enhanced when the flow of material Fl is spread, as described above, over the entire cross-section of the inlet 2.
  • the flow of material and air F3 is accele- rated in the transport pipe 4 owing to the decreasing cross-sectional area thereof.
  • the flow then has a high speed in the bend 4a, and the wood fibres therein are thus flung outwards, following the outer wall of the bend 4a and finally being conducted, together with some of the carrier air, into the conduit 4b which leads to the form ⁇ ing station.
  • perforated metal sheets and blow boxes supplementing the metal sheet 10 and the blow box 11 may, for instance, be arranged adjacent to the walls of the discharge trough 8 to enable the injection of oblique ⁇ ly and upwardly directed compressed-air jets. This may be necessary if the discharge of material from the container takes place intermittently, so that the compressed-air jets are unable to decelerate and spread all the material. It may then be necessary to further decelerate and spread the material.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)

Abstract

In a method for separating heavy particles from a particulate material, the material is introduced in a settling chamber (1) to which a carrier air flow (F2) is supplied for entraining the material while heavy particles contained therein fall to the bottom of the settling chamber (1). The material is introduced in the settling chamber (1) as a downwardly-directed flow of material (F1) through an inlet (2), and is removed from the settling chamber (1) in an upwardly-directed flow of material and air (F3) through an outlet (3) located beside the inlet. Compressed-air jets (S) directed obliquely towards the downwardly-directed flow of material are blown into the settling chamber (1) to decelerate the flow of material and spread it towards the outlet (3). The carrier air flow (F2) is blown into the settling chamber to encounter the decelerated, spread flow of material from below. A device for implementing the method as a settling chamber (1) with a downwardly-directed inlet (2) and an upwardly-directed outlet (3) located beside the inlet. A first means (10, 11) is designed to blow compressed-air jets (S) obliquely towards the inlet (2). A second means (5) is designed to blow an upwardly-directed carrier air flow into the settling chamber (1) on a level below the first means (10, 11).

Description

METHOD AND DEVICE FOR SEPARATING HEAVY PARTICLES FROM A
PARTICULATE MATERIAL
The present invention relates to a method for sepa¬ rating heavy particles, such as lumps of glue, from a particulate material, such as glue-coated wood fibres, which is pneumatically conveyed from a first station, such as a container, to a second station, such as a plant for making fibreboards, said particulate material being introduced in a settling chamber to which a carrier air flow is supplied for entraining the particulate material while heavy particles contained therein fall to the bottom of the settling chamber, said particulate material being introduced in the settling chamber as a downwardly- directed flow of material through a downwardly-directed chamber inlet and leaving the settling chamber in an upwardly-directed flow of material and air through a cham¬ ber outlet located beside said inlet. The invention also concerns a device for separating heavy particles from a particulate material.
In the making of fibreboards, glue-coated wood fibres are pneumatically conveyed, first from a drying plant to a collecting container, and from there to a forming station, where the fibres are spread as a mat on a wire through which the carrier air is drawn off. Then, the fibre mat is compressed into fibreboards under set pressure and tem¬ perature conditions.
It is essential, in the making of fibreboards, that impurities in the form of heavy particles are separated from the flow of material. Such separation is conveniently carried out during the transport of the wood fibres from the drying plant to the collecting container. In a prior- art method for separating large-size, and consequently heavy, particles from the wood fibres when transported from the drying plant to the collecting container, the wood fibres are introduced in a settling chamber to which a carrier air flow is supplied for conveying the wood fibres to the collecting container at the same time as heavy particles present therein fall to the bottom of the settling chamber. This prior-art method requires considerable amounts of carrier air to result in effective separation. The separation is performed during the transport of the wood fibres from the drying plant to the collecting container since the carrier air is most advantageously recovered at this container. Only minor carrier air flows can be removed at the forming station. In the making of thin fibreboards with a thickness of down to about 2 mm, how¬ ever, the separation should be performed as close to the forming station as possible, i.e. during the transport of the wood fibres from the container to the forming station, in order to prevent the formation of particle agglomerates. One object of the present invention is, therefore, to provide a method which makes it possible to utilise a relatively small carrier air flow in the separation and, consequently, to perform the separation during the trans¬ port of the wood fibres from the container to the forming station.
According to the invention, this object is achieved by a method which is of the type stated by way of intro- duction and which is characterised in that compressed-air jets, which are directed obliquely towards the downwardly- directed flow of material, are blown into the settling chamber to decelerate the flow of material and to spread it in its transverse direction towards the outlet, and that the carrier air flow is blown into the settling cham¬ ber to encounter from below the decelerated, transversely spread flow of material so as to form therewith said flow of material and air.
Some of the air in the upwardly-directed flow of material and air is conveniently separated from this flow before the latter reaches the second station, in order to be recycled to the settling chamber. Another object of the invention is to provide a suit¬ able device for implementing the method.
According to the invention, this object is achieved by a device which has a settling chamber with a down- wardly-directed inlet for said material and an upwardly- directed outlet located beside said inlet, and which is characterised by a first means for blowing compressed-air jets obliquely towards the downwardly-directed inlet, and a second means for blowing an upwardly-directed carrier air flow into the settling chamber on a level below said first means.
The invention will be described in more detail below, reference being had to the accompanying drawing, which schematically illustrates a device for separating heavy particles from a flow of glue-coated wood fibres.
The illustrated device is arranged between a con¬ tainer (not shown) holding glue-coated wood fibres, and a forming station (not shown) where thin fibreboards are shaped. Further, the device has a settling chamber 1 with a downwardly-directed inlet 2 for supplying the material and an upwardly-directed outlet 3 for discharging the material, the outlet 3 being located beside the inlet 2. Moreover, the inlet 2 communicates with the container from which glue-coated wood fibres are introduced in the settling chamber 1 in the form of a downwardly-directed flow of material Fl. The container preferably is a meter¬ ing container which is placed directly on the settling chamber 1 and distributes the flow of material Fl over the entire cross-section of the inlet 2. The outlet 3 communicates with the forming station by means of an upwardly-directed trnsport pipe 4 of upwardly decreasing cross-sectional area. In its upper portion, the pipe 4 has a 180° bend 4a and, after the bend, branches into two separate conduits 4b and 4c. The conduit 4b leads to the forming station. The device further has an inlet 5 through which a carrier air flow F2 is blown into the lower portion of the settling chamber 1. Adjustable guide rails 6 are provided in the inlet 5 to distribute the carrier air flow over the entire settling chamber 1.
A discharge trough 8 is provided at the bottom of the settling chamber 1, and a conveyor screw 9 is arranged in the trough 8 to discharge heavy particles collected therein. In its lower portion, the inlet 2 has a perforated metal sheet 10 which is inclined about 50° to the hori¬ zontal plane. The sheet 10 is formed with a plurality of perforations which are distributed across the sheet surface and through which the settling chamber 1 communi- cates with a blow box 11. Compressed-air jets S, which owing to the inclination of the sheet 10 are directed obliquely upwards, i.e. obliquely towards to the down¬ wardly-directed flow of material Fl, are blown into the settling chamber 1 to decelerate the flow of material and to spread it horizon¬ tally towards the outlet 3.
Glue-coated wood fibres containing impurities in the form of comparatively heavy particles, such as lumps of glue and chips, are, as mentioned earlier, introduced in the settling chamber 1 in the form of a downwardly-direct¬ ed flow of material Fl which preferably is spread over the entire cross-section of the inlet 2. The flow of material encounters the compressed-air jets S, and is thus dece¬ lerated and spread over the entire cross-section of the settling chamber 1. The carrier air flow F2 supplied through the inlet 5 entrains the particulate material in a flow of material and air F3 through the outlet 3 and the transport pipe 4, while heavy particles fall down into the trough 8 to be discharged by the conveyor screw 9. Since the compressed-air jets S are supplied in the manner described above, the carrier air flow can be considerably reduced compared with that required in the prior-art separation method described by way of introduction. This effect is further enhanced when the flow of material Fl is spread, as described above, over the entire cross-section of the inlet 2. The flow of material and air F3 is accele- rated in the transport pipe 4 owing to the decreasing cross-sectional area thereof. The flow then has a high speed in the bend 4a, and the wood fibres therein are thus flung outwards, following the outer wall of the bend 4a and finally being conducted, together with some of the carrier air, into the conduit 4b which leads to the form¬ ing station. The remainder of the carrier air is conducted into the conduit 4c to be recycled into the settling cham¬ ber 1, mainly through the inlet 5. A minor amount is recycled to the settling chamber 1 through the container. It goes without saying that the invention is not restricted to the embodiment described above, and thus can be modified in many different ways within the scope of the appended claims. Thus, perforated metal sheets and blow boxes supplementing the metal sheet 10 and the blow box 11 may, for instance, be arranged adjacent to the walls of the discharge trough 8 to enable the injection of oblique¬ ly and upwardly directed compressed-air jets. This may be necessary if the discharge of material from the container takes place intermittently, so that the compressed-air jets are unable to decelerate and spread all the material. It may then be necessary to further decelerate and spread the material.

Claims

1. Method for separating heavy particles, such as lumps of glue, from a particulate material, such as glue- coated wood fibres, which is pneumatically conveyed from a first station, such as a container, to a second station, such as a plant for making fibreboards, said particulate material being introduced in a settling chamber (1) to which a carrier air flow (F2) is supplied for entraining the particulate material while heavy particles contained therein fall to the bottom of the settling chamber, said particulate material being introduced in the settling chamber (1) as a downwardly-directed flow of material (Fl) through a downwardly-directed chamber inlet (2) and leav¬ ing the settling chamber (1) in an upwardly-directed flow of material and air (F3) through a chamber outlet (3) located beside said inlet, c h a r a c t e r i s e d in that compressed-air jets (S), which are directed obliquely towards the downwardly-directed flow of material, are blown into the settling chamber (1 ) to decelerate the flow of material and to spread it in its transverse direction towards the outlet (3), and that the carrier air flow (F2) is blown into the settling chamber to encounter from below the decelerated, transversely spread flow of material so as to form therewith said flow of material and air (F3 ) .
2. The method of claim 1, c h a r a c t e r i s e d in that some of the air in the upwardly-directed flow of material and air (F3) is separated from this flow before the latter reaches the second station, in order to be recycled into the settling chamber (1) .
3. Device for separating heavy particles from a par¬ ticulate material, said device having a settling chamber
(1 ) with a downwardly-directed inlet (2) for said material and an upwardly-directed outlet (3) located beside said inlet, c h a r a c t e r i s e d by a first means (10, 11) for blowing compressed-air jets (S) obliquely towards the downwardly-directed inlet (2), and a second means (5) for blowing an upwardly-directed carrier air flow into the settling chamber (1) on a level below said first means (10, 11).
PCT/SE1991/000603 1990-09-28 1991-09-24 Method and device for separating heavy particles from a particulate material WO1992005882A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9003092A SE467044B (en) 1990-09-28 1990-09-28 SEAT AND DEVICE FOR SEPARATION OF WEIGHTER PARTICLES FROM A PARTICULAR MATERIAL
SE9003092-5 1990-09-28

Publications (1)

Publication Number Publication Date
WO1992005882A1 true WO1992005882A1 (en) 1992-04-16

Family

ID=20380484

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1991/000603 WO1992005882A1 (en) 1990-09-28 1991-09-24 Method and device for separating heavy particles from a particulate material

Country Status (4)

Country Link
EP (1) EP0553140A1 (en)
AU (1) AU8637691A (en)
SE (1) SE467044B (en)
WO (1) WO1992005882A1 (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0599088B1 (en) * 1992-11-25 1997-01-15 Sunds Defibrator Industries Aktiebolag Apparatus for separating heavy particles from a flow of fiber material
US5725102A (en) * 1993-06-18 1998-03-10 Abb Flakt Ab Method and device for separating heavy particles from a particulate material
EP0795359A3 (en) * 1996-03-14 1998-03-11 ALOIS SCHEUCH GESELLSCHAFT m.b.H. Air classifier
ES2113239A1 (en) * 1993-12-17 1998-04-16 Escudero Lozano Jose Pneumatic system for separating inert substances of vegetable material
WO1998048950A1 (en) * 1997-04-29 1998-11-05 Kvaerner Panel Systems Gmbh Maschinen- Und Anlagenbau Air separation process and device
EP0982082A1 (en) * 1998-08-21 2000-03-01 Beloit Technologies, Inc. Apparatus for separating mixed particulate material
WO2001089783A1 (en) * 2000-05-24 2001-11-29 Flakeboard Company Limited Method and device for disintegrating irregularities in streams of wood fibres
US6902125B2 (en) 2000-05-24 2005-06-07 Fritz Schneider Process and device for disintegrating irregularities in flows of wood fibres
DE102011008757A1 (en) 2011-01-17 2012-07-19 Dieffenbacher GmbH Maschinen- und Anlagenbau Method and apparatus for prospecting for contaminants from a pneumatic fiber stream

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1888372A (en) * 1929-08-06 1932-11-22 Birtley Iron Company Ltd Separation of dry materials
US2766880A (en) * 1951-08-04 1956-10-16 Ruhrchemie Ag Separation of fine-grained portions from granular materials
CH322142A (en) * 1954-08-11 1957-06-15 Buehler Ag Geb Device for cleaning and sorting pneumatically conveyed bulk material
US2834061A (en) * 1954-05-07 1958-05-13 Lummus Cotton Gin Co Pneumatic fiber cleaning apparatus
DE1802161A1 (en) * 1967-10-10 1969-06-19 Domtar Ltd Method and device for classifying and dispensing material
US4882042A (en) * 1986-01-13 1989-11-21 Sumitomo Chemical Company, Ltd. Floss separating apparatus and method

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1888372A (en) * 1929-08-06 1932-11-22 Birtley Iron Company Ltd Separation of dry materials
US2766880A (en) * 1951-08-04 1956-10-16 Ruhrchemie Ag Separation of fine-grained portions from granular materials
US2834061A (en) * 1954-05-07 1958-05-13 Lummus Cotton Gin Co Pneumatic fiber cleaning apparatus
CH322142A (en) * 1954-08-11 1957-06-15 Buehler Ag Geb Device for cleaning and sorting pneumatically conveyed bulk material
DE1802161A1 (en) * 1967-10-10 1969-06-19 Domtar Ltd Method and device for classifying and dispensing material
US4882042A (en) * 1986-01-13 1989-11-21 Sumitomo Chemical Company, Ltd. Floss separating apparatus and method

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0599088B1 (en) * 1992-11-25 1997-01-15 Sunds Defibrator Industries Aktiebolag Apparatus for separating heavy particles from a flow of fiber material
US5725102A (en) * 1993-06-18 1998-03-10 Abb Flakt Ab Method and device for separating heavy particles from a particulate material
ES2113239A1 (en) * 1993-12-17 1998-04-16 Escudero Lozano Jose Pneumatic system for separating inert substances of vegetable material
EP0795359A3 (en) * 1996-03-14 1998-03-11 ALOIS SCHEUCH GESELLSCHAFT m.b.H. Air classifier
WO1998048950A1 (en) * 1997-04-29 1998-11-05 Kvaerner Panel Systems Gmbh Maschinen- Und Anlagenbau Air separation process and device
DE19718158C2 (en) * 1997-04-29 2003-04-24 Kvaerner Panel Sys Gmbh Method and device for windsifting separation
EP0982082A1 (en) * 1998-08-21 2000-03-01 Beloit Technologies, Inc. Apparatus for separating mixed particulate material
WO2001089783A1 (en) * 2000-05-24 2001-11-29 Flakeboard Company Limited Method and device for disintegrating irregularities in streams of wood fibres
US6902125B2 (en) 2000-05-24 2005-06-07 Fritz Schneider Process and device for disintegrating irregularities in flows of wood fibres
DE102011008757A1 (en) 2011-01-17 2012-07-19 Dieffenbacher GmbH Maschinen- und Anlagenbau Method and apparatus for prospecting for contaminants from a pneumatic fiber stream
WO2012098131A1 (en) 2011-01-17 2012-07-26 Dieffenbacher GmbH Maschinen- und Anlagenbau Method and device for separating out contaminants from a pneumatic fibre stream

Also Published As

Publication number Publication date
SE467044B (en) 1992-05-18
AU8637691A (en) 1992-04-28
SE9003092L (en) 1992-03-29
SE9003092D0 (en) 1990-09-28
EP0553140A1 (en) 1993-08-04

Similar Documents

Publication Publication Date Title
WO1992005882A1 (en) Method and device for separating heavy particles from a particulate material
KR0129104B1 (en) System for separation of waste material
PL226958B1 (en) Device for vacuum pneumatic separation of bulk materials
AU682518B2 (en) Method and device for separating heavy particles from a particulate material
CA2420303C (en) Apparatus for sorting wood chips in separate fractions
CA1334523C (en) Method and apparatus for separation of objectionable particles from tobacco
CA2185735C (en) Procedure and apparatus for separating heavy particles of material from lighter ones
CN100364465C (en) Cigarette manufacturing method and machine
US2328568A (en) Process for dedusting comminuted soap
RU78703U1 (en) INSTALLATION OF PNEUMATIC SEPARATION
US5027835A (en) Apparatus for pneumatic transportation of particulate material such as tobacco
US20060016920A1 (en) Device for feeding wood chips to a processing unit
EP0599088B1 (en) Apparatus for separating heavy particles from a flow of fiber material
US11278934B2 (en) Dedusting apparatus having air knives and ionizing wires
US6279201B1 (en) Device for distributing particles
JPS63167781A (en) Air guide mechanism for cigarette continuous body in tobacco processing industry
CN214723474U (en) Material distributing and dust removing device for iron casting polishing machine
JP2662117B2 (en) Powder material supply method for airflow classifier and apparatus for implementing this method
GB2221172A (en) Gravitational separator
EP0492924B1 (en) Method and apparatus for separation of heavy and light particles from particulate material
SU988910A1 (en) Apparatus for separating fibrous material being conveyed

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AT AU BB BG BR CA CH CS DE DK ES FI GB HU JP KP KR LK LU MC MG MW NL NO PL RO SD SE SU US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE BF BJ CF CG CH CI CM DE DK ES FR GA GB GN GR IT LU ML MR NL SE SN TD TG

WWE Wipo information: entry into national phase

Ref document number: 1991917644

Country of ref document: EP

WWP Wipo information: published in national office

Ref document number: 1991917644

Country of ref document: EP

REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

NENP Non-entry into the national phase

Ref country code: CA

WWW Wipo information: withdrawn in national office

Ref document number: 1991917644

Country of ref document: EP