EP1362643A1 - Apparatus and method to screen materials having different sizes and/or density - Google Patents
Apparatus and method to screen materials having different sizes and/or density Download PDFInfo
- Publication number
- EP1362643A1 EP1362643A1 EP03010771A EP03010771A EP1362643A1 EP 1362643 A1 EP1362643 A1 EP 1362643A1 EP 03010771 A EP03010771 A EP 03010771A EP 03010771 A EP03010771 A EP 03010771A EP 1362643 A1 EP1362643 A1 EP 1362643A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- screening
- gap
- fractions
- rollers
- screening rollers
- Prior art date
- Legal status (The legal status 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 status listed.)
- Withdrawn
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Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/02—Pretreatment of the raw materials by chemical or physical means
- D21B1/023—Cleaning wood chips or other raw materials
-
- 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
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/12—Apparatus having only parallel elements
- B07B1/14—Roller screens
- B07B1/15—Roller screens using corrugated, grooved or ribbed rollers
Definitions
- the present invention concerns an apparatus and a method to screen and separate materials with different sizes and/or density, such as for example pieces, chips or shavings of wood, and at the same time to eliminate, or discard, the impurities which have a greater density than that of the materials to be accepted, such as for example metal pieces or stones of a greater or smaller size.
- the apparatus comprises a plurality of screening rollers, each one having its outer surface shaped in such a manner as to define a plurality of protruding elements (22) alternated to corresponding grooves.
- the screening rollers are parallel to each other and arranged so that their cusps are inserted, more or less deeply, into the grooves of an adjacent roller.
- the rollers all together define a screening plane which is divided into two or more fractions, one adjacent to the other, in each of which the screening rollers are separated from each other so as to define a gap of a determinate value, different from that of the other fractions.
- at least one screening roller has the protruding elements reduced, beveled or rounded so as to obtain sections of passage which are locally greater, without varying the gap between the screening rollers.
- the state of the art includes various devices, including that described in the Italian patent IT-A-1.290.736 which belongs to the same Applicant.
- This known device comprises a plurality of rollers, all rotating in the same direction, which face each other so that the cusps of each roller are inserted into the corresponding V-shaped grooves of the adjacent rollers, thus defining a zigzag discharge profile.
- the rollers are also separated laterally so as to define between them adjustable gaps, through which only the pieces of a size equal to or less than the gaps themselves can pass.
- This known apparatus although it is very efficacious in separating and dividing relatively small pieces, that is, which have a size of a few millimeters, is not able to separate, in the best possible way, pieces of material with a higher density, like pieces of metal or stone, from the rest of the materials with a lower density, such as wood or similar.
- the state of the art also includes an apparatus wherein the screening rollers are divided into two fractions having different gaps and wherein, in order to divide the higher density materials from the lower density materials, at the end of each fraction the screening rollers are separated from each other by a wider gap than that of the same fraction.
- the purpose of the invention is to achieve an apparatus and perfect a method to screen and separate materials having different sizes, particularly but not exclusively pieces, chips or shavings of wood, and the same time eliminate or discard the impurities or improper materials with a greater density than that of the materials to be accepted, such as for example pieces of metal or stone.
- the apparatus comprises a plurality of screening rollers, each one having the outer surface shaped in such a manner as to define a plurality of protruding elements, constituted by teeth, cusps, or similar elements.
- the screening rollers are parallel to each other and arranged so that their protruding elements are inserted, more or less deeply, into corresponding grooves of an adjacent roller. All the screening rollers together define a screening plane which is divided into one or more fractions, one adjacent to the other, in each of which the screening rollers are separated from each other so as to define a gap of a determinate value, different from that of the other fractions.
- at least one screening roller has the protruding elements reduced, beveled or rounded, so as to obtain zones of passage which are locally greater, without varying the interaxis between the screening rollers and hence the gap.
- the gap between the screening rollers is constant.
- the zones of greater section, as mentioned above, made in correspondence with the protruding elements, even if reduced, beveled or rounded, at intervals with lateral zones with a constant gap, have the advantage that they prevent an excessive quantity of material which should be accepted from being discarded together with the improper material which is in fact to be discarded.
- the position and number of the screening rollers with the protruding elements reduced, beveled or rounded can vary within the field of each fraction of the screening plane, so that the apparatus according to the invention is very versatile and the layout can easily be varied.
- conveyor means comprising for example a horizontal screw.
- an apparatus 10 to separate materials 11 having different sizes and/or density, comprises a metal bearing structure 12, substantially shaped like a parallelepiped and able to define a separation chamber 13, open downwards, on one side of which, through a hopper type mouth 15, an incoherent mass of material 11 is able to be introduced.
- the latter can consist of pieces of woody material, mixed with impurities of other material with a higher density, for example iron or stone material.
- the screening rollers 16 are made to rotate, all in a clockwise direction (fig. 1), by motor means of a conventional type and not shown in the drawings.
- Each roller 16 comprises a plurality of screening elements 20 adjacent to each other; they are advantageously made of metal, rubber or synthetic material, and have cusps 22 (figs. 3 and 4).
- Each screening roller 16 is mounted in such a manner that the cusps 22 of the screening elements 20 of each of them is constantly inserted, more or less deeply, into the corresponding grooves 24 of the adjacent roller 16, so as to define discharge gaps 25 with a zigzag profile.
- the bed of screening rollers 16 is divided into a plurality of fractions, for example three, F1, F2 and F3.
- the gap 25 between the different screening rollers 16 can be either constant or variable, according to the screening requirements.
- the amplitude G2 of the gap 25 of the second fraction F2 is greater than the amplitude G1 of the gap 25 of the first fraction F1 and the amplitude G3 of the gap 25 of the third fraction F3 is greater than the amplitude G2 of the gap 25 of the second fraction F2.
- the sizes of the gaps 25 vary according to the granulometry of the material which is to be screened, that is, to be passed between the rollers 16.
- G1 can be between 0.3 mm and 1.5 mm
- G2 can be between 1 mm and 2.5 mm
- G3 can be between 2 mm and 6 mm.
- At least one roller 16a of each fraction F1, F2, F3 has the cusps 22 reduced, beveled or rounded, so as to define, in association with the corresponding groove 24 of the adjacent roller 16, zones 30 having an amplitude greater than that of the corresponding gap 25, whether it be G1, G2 or G3.
- Fig. 3 shows a solution which provides the presence of two rollers 16a, with reduced, beveled or rounded cusps 22, adjacent to each other
- fig. 4 shows a variant which provides the presence of a single roller 16a, with reduced, beveled or rounded cusps 22.
- the solution shown in fig. 3 between the two rollers 16a there is a continuity of zones 30 and there are no V-shaped grooves 24.
- the position of the roller(s) 16a in the field of each fraction F1, F2, F3 is chosen according to the screening requirements and the percentage of improper material in the mass 11 to be eliminated.
- Each screw 31 is movable horizontally so as to be correctly positioned in correspondence with the rollers 16a above.
- a pair of conveyor walls 33 associated with each screw 31, there is a pair of conveyor walls 33, substantially vertical, which can be suitably inclined.
- the screening method of the apparatus 10 as described heretofore comprises a step of introducing the materials 11 through the mouth 15 into the bed of screening rollers 16 in such a manner that the latter, rotating, perform a first screening action in the fraction F1 and allow only the fine materials to pass, with a size less than G1. Due to the action of the rollers 16, the higher density materials tend to be arranged towards the bottom so that, when they reach the zones 30, created by each roller 16a, they naturally fall downwards and are discharged by the screw 31 below. The same action is performed in the subsequent fractions F2 and F3.
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Sorting Of Articles (AREA)
- Combined Means For Separation Of Solids (AREA)
Abstract
Apparatus to screen materials (11) having different sizes
and/or density, comprising a plurality of screening rollers
(16) arranged parallel to each other and each having the
outer surface shaped in such a manner as to define a
plurality of protruding elements (22) alternated to
corresponding grooves (24). The screening rollers (16) are
arranged in such a manner that the protruding elements (22)
of each roller are inserted, more or less deeply, into the
grooves (24) of an adjacent roller. The screening rollers
(16) define a screening plane which is divided into one or
more fractions (F1, F2, F3), one adjacent to the other, in
each of which the relative screening rollers (16) are
separated from each other so as to define a gap (25) of a
determinate value, different from that of the other
fractions. In the field of each of the fractions (F1, F2,
F3) at least one screening roller (16a) has the protruding
elements (22) reduced, beveled or rounded so as to obtain
zones (30) with a section of passage which is locally
greater, without varying the interaxis between the
screening rollers (16a) and hence the gap (25).
Description
- The present invention concerns an apparatus and a method to screen and separate materials with different sizes and/or density, such as for example pieces, chips or shavings of wood, and at the same time to eliminate, or discard, the impurities which have a greater density than that of the materials to be accepted, such as for example metal pieces or stones of a greater or smaller size. The apparatus comprises a plurality of screening rollers, each one having its outer surface shaped in such a manner as to define a plurality of protruding elements (22) alternated to corresponding grooves. The screening rollers are parallel to each other and arranged so that their cusps are inserted, more or less deeply, into the grooves of an adjacent roller. The rollers all together define a screening plane which is divided into two or more fractions, one adjacent to the other, in each of which the screening rollers are separated from each other so as to define a gap of a determinate value, different from that of the other fractions. In the field of each fraction at least one screening roller has the protruding elements reduced, beveled or rounded so as to obtain sections of passage which are locally greater, without varying the gap between the screening rollers.
- In order to screen elements or materials of different sizes, especially those of vegetable origin, such as wood or similar, the state of the art includes various devices, including that described in the Italian patent IT-A-1.290.736 which belongs to the same Applicant. This known device comprises a plurality of rollers, all rotating in the same direction, which face each other so that the cusps of each roller are inserted into the corresponding V-shaped grooves of the adjacent rollers, thus defining a zigzag discharge profile. The rollers are also separated laterally so as to define between them adjustable gaps, through which only the pieces of a size equal to or less than the gaps themselves can pass.
- This known apparatus, although it is very efficacious in separating and dividing relatively small pieces, that is, which have a size of a few millimeters, is not able to separate, in the best possible way, pieces of material with a higher density, like pieces of metal or stone, from the rest of the materials with a lower density, such as wood or similar.
- The state of the art also includes an apparatus wherein the screening rollers are divided into two fractions having different gaps and wherein, in order to divide the higher density materials from the lower density materials, at the end of each fraction the screening rollers are separated from each other by a wider gap than that of the same fraction. To provide a wider gap at the end of every fraction and for the whole length of the rollers, however, entails the following disadvantages: if there is a limited quantity of higher density materials, lower density materials can also pass through the wider gap, even though this is not desired, and can be discarded, although they should be accepted; vice versa, when there is a considerable quantity of higher density materials, there is a risk that not all these materials are expelled through the only wider gap located downstream of the fraction of rollers with a constant and more limited gap.
- The present Applicant has devised the method and embodied the apparatus according to this invention in order to overcome these shortcomings of the state of the art, and to obtain further advantages, which are set out hereafter.
- The present invention is set forth and characterized in the main claims, while the dependent claims describe other characteristic features of the present invention.
- The purpose of the invention is to achieve an apparatus and perfect a method to screen and separate materials having different sizes, particularly but not exclusively pieces, chips or shavings of wood, and the same time eliminate or discard the impurities or improper materials with a greater density than that of the materials to be accepted, such as for example pieces of metal or stone.
- In accordance with this purpose, the apparatus according to the invention comprises a plurality of screening rollers, each one having the outer surface shaped in such a manner as to define a plurality of protruding elements, constituted by teeth, cusps, or similar elements. The screening rollers are parallel to each other and arranged so that their protruding elements are inserted, more or less deeply, into corresponding grooves of an adjacent roller. All the screening rollers together define a screening plane which is divided into one or more fractions, one adjacent to the other, in each of which the screening rollers are separated from each other so as to define a gap of a determinate value, different from that of the other fractions. In the field of each fraction at least one screening roller has the protruding elements reduced, beveled or rounded, so as to obtain zones of passage which are locally greater, without varying the interaxis between the screening rollers and hence the gap.
- Advantageously, within the field of each fraction, the gap between the screening rollers is constant. Moreover the zones of greater section, as mentioned above, made in correspondence with the protruding elements, even if reduced, beveled or rounded, at intervals with lateral zones with a constant gap, have the advantage that they prevent an excessive quantity of material which should be accepted from being discarded together with the improper material which is in fact to be discarded.
- The position and number of the screening rollers with the protruding elements reduced, beveled or rounded can vary within the field of each fraction of the screening plane, so that the apparatus according to the invention is very versatile and the layout can easily be varied.
- Below each discharge zone of the higher density materials there are conveyor means, comprising for example a horizontal screw.
- These and other characteristics of the present invention will be apparent from the following description of a preferential form of embodiment, given as a non-restrictive example with reference to the attached drawings wherein:
- fig. 1 is a lateral and schematic view of an apparatus according to the invention;
- fig. 2 is a section from II to II of fig. 1;
- fig. 3 is an enlarged view from above of a first detail of the apparatus in fig. 1;
- fig. 4 is an enlarged view from above of a variant of fig. 3;
- fig. 5 is an enlarged detail of fig. 3;
- fig. 6 is a variant of fig. 5.
- With reference to figs. 1 and 2, an
apparatus 10 according to the invention, to separatematerials 11 having different sizes and/or density, comprises a metal bearingstructure 12, substantially shaped like a parallelepiped and able to define aseparation chamber 13, open downwards, on one side of which, through ahopper type mouth 15, an incoherent mass ofmaterial 11 is able to be introduced. The latter can consist of pieces of woody material, mixed with impurities of other material with a higher density, for example iron or stone material. - Inside the
chamber 13 there is a plurality ofscreening rollers 16, mounted rotary onlateral walls structure 12. Therollers 16 have their axes of rotation parallel to each other and lying substantially on the same plane, so as to form a so-called screening bed; this plane can be horizontal, as shown in fig. 1, or inclined, advantageously upwards. Thescreening rollers 16 are made to rotate, all in a clockwise direction (fig. 1), by motor means of a conventional type and not shown in the drawings. - Each
roller 16 comprises a plurality ofscreening elements 20 adjacent to each other; they are advantageously made of metal, rubber or synthetic material, and have cusps 22 (figs. 3 and 4). - The
screening elements 20, adjacent to each other, define a plurality ofgrooves 24, for example V-shaped grooves, alternating with the corresponding teeth orcusps 22. - Each
screening roller 16 is mounted in such a manner that thecusps 22 of thescreening elements 20 of each of them is constantly inserted, more or less deeply, into thecorresponding grooves 24 of theadjacent roller 16, so as to definedischarge gaps 25 with a zigzag profile. - The bed of
screening rollers 16 is divided into a plurality of fractions, for example three, F1, F2 and F3. In each fraction F1, F2 and F3 thegap 25 between thedifferent screening rollers 16 can be either constant or variable, according to the screening requirements. Moreover, advantageously, the amplitude G2 of thegap 25 of the second fraction F2 is greater than the amplitude G1 of thegap 25 of the first fraction F1 and the amplitude G3 of thegap 25 of the third fraction F3 is greater than the amplitude G2 of thegap 25 of the second fraction F2. - The sizes of the
gaps 25 vary according to the granulometry of the material which is to be screened, that is, to be passed between therollers 16. For example, G1 can be between 0.3 mm and 1.5 mm, G2 can be between 1 mm and 2.5 mm and G3 can be between 2 mm and 6 mm. - According to one characteristic of the invention, at least one
roller 16a of each fraction F1, F2, F3 has thecusps 22 reduced, beveled or rounded, so as to define, in association with thecorresponding groove 24 of theadjacent roller 16,zones 30 having an amplitude greater than that of thecorresponding gap 25, whether it be G1, G2 or G3. Fig. 3 shows a solution which provides the presence of tworollers 16a, with reduced, beveled orrounded cusps 22, adjacent to each other, whereas fig. 4 shows a variant which provides the presence of asingle roller 16a, with reduced, beveled orrounded cusps 22. In the solution shown in fig. 3, between the tworollers 16a there is a continuity ofzones 30 and there are no V-shaped grooves 24. - In this way, with each of the two solutions, through the
zones 30 it is possible to discharge possible extraneous bodies or impurities with a greater density than that of the materials to be accepted, even if they have a bigger size than therelative gap 25, without needing to vary the interaxis between therollers 16. - Moreover, as can be seen better in figs. 5 and 6, when the
cusps 22 have a reduced, beveled or rounded shape K, with a height substantially equal to thegap 25, we achievezones 30 which have a transverse section of several times more than that of the corresponding V-shaped grooves 24, as shown by the shaded part of fig. 5. - The position of the roller(s) 16a in the field of each fraction F1, F2, F3 is chosen according to the screening requirements and the percentage of improper material in the
mass 11 to be eliminated. - Below each
roller 16a, or each group ofrollers 16a (fig. 1), of each fraction F1, F2, F3, there is ascrew 31, connected to an electric motor 32 (fig. 2) and able to remove to the outside the materials discarded mainly throughzones 30. Eachscrew 31 is movable horizontally so as to be correctly positioned in correspondence with therollers 16a above. Moreover, associated with eachscrew 31, there is a pair ofconveyor walls 33, substantially vertical, which can be suitably inclined. - The screening method of the
apparatus 10 as described heretofore comprises a step of introducing thematerials 11 through themouth 15 into the bed ofscreening rollers 16 in such a manner that the latter, rotating, perform a first screening action in the fraction F1 and allow only the fine materials to pass, with a size less than G1. Due to the action of therollers 16, the higher density materials tend to be arranged towards the bottom so that, when they reach thezones 30, created by eachroller 16a, they naturally fall downwards and are discharged by thescrew 31 below. The same action is performed in the subsequent fractions F2 and F3. - It is clear that modifications and additions of parts or steps can be made to the
apparatus 10 and method to separate elements ormaterials 11 having different sizes as described heretofore, without departing from the field and scope of the present invention. For example, instead of thescrew 31, any other discharge means of a conventional type can be used. - It is also clear that, although the present invention has been described with reference to some specific examples, a person of skill in the field shall certainly be able to achieve many other equivalent forms of embodiment, all of which shall come within the field and scope of the present invention.
Claims (9)
- Apparatus to screen materials (11) having different sizes and/or density, comprising a plurality of screening rollers (16) arranged parallel to each other and each having the outer surface shaped in such a manner as to define a plurality of protruding elements (22) alternated to corresponding grooves (24), wherein said screening rollers (16) are arranged in such a manner that the protruding elements (22) of each roller are inserted, more or less deeply, into the grooves (24) of an adjacent roller, and wherein said screening rollers (16) define a screening plane which is divided into one or more fractions (F1, F2, F3), one adjacent to the other, in each of which the relative screening rollers (16) are separated from each other so as to define a gap (25) of a determinate value, different from that of the other fractions, characterized in that in the field of each of said fractions (F1, F2, F3) at least one screening roller (16a) has the protruding elements (22) reduced, beveled or rounded so as to obtain zones (30) with a section of passage which is locally greater, without varying the interaxis between the screening rollers (16a) and hence the gap (25).
- Apparatus as in claim 1, characterized in that in at least one of said fractions (F1, F2, F3) at least two screening rollers (16a) are provided, adjacent to each other, having the protruding elements (22) reduced, beveled or rounded.
- Apparatus as in claim 1 or 2, characterized in that, in the field of each of said fractions (F1, F2, F3), the gap (25) between the relative screening rollers (16, 16a) is substantially constant and that said zones (30) are at intervals with lateral zones with a constant gap (25).
- Apparatus as in any claim hereinbefore, characterized in that there are at least three fractions (F1, F2, F3), that the amplitude (G2) of the gap (25) of the second of said fractions (F2) is greater than the amplitude (G1) of the gap (25) of the first fraction (F1) and that the amplitude (G3) of the gap (25) of the third fraction (F3) is greater than the amplitude (G2) of the gap (25) of the second fraction (F2).
- Apparatus as in claim 4, characterized in that the amplitude (G1) of the gap (25) of the first fraction (F1) is between 0.3 mm and 1.5 mm, the amplitude (G2) of the gap (25) of the second fraction (F2) is between 1 mm and 2.5 mm, and the amplitude (G3) of the gap (25) of the third fraction (F3) is between 2 mm and 6 mm.
- Apparatus as in any claim hereinbefore, characterized in that below each of said screening rollers (16a) with reduced, beveled or rounded protruding elements (22) of each of said fractions (F1, F2, F3) there are discharge means (31) to discharge the eliminated materials.
- Apparatus as in claim 6, characterized in that said discharge means comprise a screw (31), connected to a motor means (32).
- Apparatus as in claim 6 or 7, characterized in that between said discharge means (31) and said screening rollers (16a) with reduced, beveled or rounded protruding elements (22), there is a pair of conveyor walls (33), substantially vertical, but selectively inclinable.
- Method to screen materials (11) having different sizes and/or density, comprising a step of introducing said materials (11) onto a plurality of screening rollers (16) arranged parallel to each other and each having the outer surface shaped in such a manner as to define a plurality of protruding elements (22) alternated to corresponding grooves (24), wherein said screening rollers (16) are arranged in such a manner that the protruding elements (22) of each roller are inserted, more or less deeply, into the grooves (24) of an adjacent roller, and wherein said screening rollers (16) define a screening plane which is divided into one or more fractions (F1, F2, F3), one adjacent to the other, in each of which the relative screening rollers (16) are separated from each other so as to define a gap (25) of a determinate value, different from that of the other fractions, characterized in that in the field of each of said fractions (F1, F2, F3) said material is made to advance by said screening rollers (16) towards at least one screening roller (16a) having the protruding elements (22) reduced, beveled or rounded and defining zones (30) with a section of passage which is locally greater.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT2002UD000105A ITUD20020105A1 (en) | 2002-05-16 | 2002-05-16 | APPARATUS AND METHOD FOR SCREENING MATERIALS HAVING DIFFERENT DIMENSIONS AND / OR DENSITIES |
ITUD20020105 | 2002-05-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1362643A1 true EP1362643A1 (en) | 2003-11-19 |
Family
ID=11460711
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03010771A Withdrawn EP1362643A1 (en) | 2002-05-16 | 2003-05-14 | Apparatus and method to screen materials having different sizes and/or density |
Country Status (2)
Country | Link |
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EP (1) | EP1362643A1 (en) |
IT (1) | ITUD20020105A1 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1736249A1 (en) * | 2005-06-23 | 2006-12-27 | Caustier France | Device for dimensional sorting of substantially spherical or ovoid products |
WO2010049748A1 (en) * | 2008-10-30 | 2010-05-06 | Globus S.R.L. | Cam-based classifier for the treatment of heterogeneous masses of materials |
ITRA20100021A1 (en) * | 2010-07-22 | 2012-01-23 | Bmcr S R L | ROLLED SCREWS. |
JP6049840B1 (en) * | 2015-11-10 | 2016-12-21 | 株式会社栗本鐵工所 | Roller screen |
EP2030498B2 (en) † | 2007-08-30 | 2020-12-02 | PELLENC (Société Anonyme) | Sorting device with conveyor rolls, for removing foreign bodies mixed with grape berries harvested from the soil |
IT201900015126A1 (en) * | 2019-08-28 | 2021-02-28 | Pal S R L | SELECTING MACHINE FOR CLEANING INCOHERENT MATERIAL AND RELATIVE SELECTION PROCEDURE |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE95784C (en) * | ||||
EP0727293A1 (en) * | 1995-02-15 | 1996-08-21 | Sunds Defibrator Loviisa Oy | Method and apparatus for removing impurities from pulverized or chipped material, especially wood chip and fiber materials |
WO1998040173A1 (en) * | 1997-03-12 | 1998-09-17 | Pal S.R.L. | Roller device to separate chips and particles of different gradings, and the relative forming machine employing the device |
-
2002
- 2002-05-16 IT IT2002UD000105A patent/ITUD20020105A1/en unknown
-
2003
- 2003-05-14 EP EP03010771A patent/EP1362643A1/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE95784C (en) * | ||||
EP0727293A1 (en) * | 1995-02-15 | 1996-08-21 | Sunds Defibrator Loviisa Oy | Method and apparatus for removing impurities from pulverized or chipped material, especially wood chip and fiber materials |
WO1998040173A1 (en) * | 1997-03-12 | 1998-09-17 | Pal S.R.L. | Roller device to separate chips and particles of different gradings, and the relative forming machine employing the device |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1736249A1 (en) * | 2005-06-23 | 2006-12-27 | Caustier France | Device for dimensional sorting of substantially spherical or ovoid products |
FR2887479A1 (en) * | 2005-06-23 | 2006-12-29 | Caustier France Sa | DIMENSIONAL CALIBRATION DEVICE FOR SUBSTANTIALLY SPHERICAL OR OVOID OBJECTS SUCH AS FRUIT |
EP2030498B2 (en) † | 2007-08-30 | 2020-12-02 | PELLENC (Société Anonyme) | Sorting device with conveyor rolls, for removing foreign bodies mixed with grape berries harvested from the soil |
WO2010049748A1 (en) * | 2008-10-30 | 2010-05-06 | Globus S.R.L. | Cam-based classifier for the treatment of heterogeneous masses of materials |
ITRA20100021A1 (en) * | 2010-07-22 | 2012-01-23 | Bmcr S R L | ROLLED SCREWS. |
JP6049840B1 (en) * | 2015-11-10 | 2016-12-21 | 株式会社栗本鐵工所 | Roller screen |
IT201900015126A1 (en) * | 2019-08-28 | 2021-02-28 | Pal S R L | SELECTING MACHINE FOR CLEANING INCOHERENT MATERIAL AND RELATIVE SELECTION PROCEDURE |
WO2021038606A1 (en) * | 2019-08-28 | 2021-03-04 | Pal S.R.L. | Selector machine to clean incoherent material, and corresponding selection method |
Also Published As
Publication number | Publication date |
---|---|
ITUD20020105A1 (en) | 2003-11-17 |
ITUD20020105A0 (en) | 2002-05-16 |
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