EP0436888B1 - Rotor für Drucksortierer zum Sortieren von Fasersuspensionen - Google Patents

Rotor für Drucksortierer zum Sortieren von Fasersuspensionen Download PDF

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Publication number
EP0436888B1
EP0436888B1 EP90124702A EP90124702A EP0436888B1 EP 0436888 B1 EP0436888 B1 EP 0436888B1 EP 90124702 A EP90124702 A EP 90124702A EP 90124702 A EP90124702 A EP 90124702A EP 0436888 B1 EP0436888 B1 EP 0436888B1
Authority
EP
European Patent Office
Prior art keywords
rotor
screen
rotation
regions
return
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.)
Expired - Lifetime
Application number
EP90124702A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0436888A2 (de
EP0436888A3 (en
Inventor
Emil Holz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Finckh Fiber Systems GmbH and Co KG
Original Assignee
Hermann Finckh Maschinenfabrik GmbH and Co
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 Hermann Finckh Maschinenfabrik GmbH and Co filed Critical Hermann Finckh Maschinenfabrik GmbH and Co
Publication of EP0436888A2 publication Critical patent/EP0436888A2/de
Publication of EP0436888A3 publication Critical patent/EP0436888A3/de
Application granted granted Critical
Publication of EP0436888B1 publication Critical patent/EP0436888B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/02—Straining or screening the pulp
    • D21D5/023—Stationary screen-drums
    • D21D5/026—Stationary screen-drums with rotating cleaning foils

Definitions

  • the invention relates to a rotor for pressure sorters for sorting fiber suspensions, as described and illustrated, for example, in US Pat. Nos. 3,581,903, 3,849,302 and 4,155,841 or in EP-0 042 742-B1.
  • Such pressure sorters have a rotationally symmetrical sieve, usually in the form of a sieve cylinder, to which the fiber suspension to be sorted is fed in the direction of the rotor axis, the inside or outside of the sieve being able to form the inlet or inflow side of the sieve.
  • the sieve is usually arranged with a vertically oriented axis, and the fiber suspension to be sorted is fed to the sieve from above, so that the upper end of the sieve forms its inlet end.
  • the rotor of these pressure sorters has a rotor axis which coincides with the sieve axis, and its effective areas run adjacent to the inlet side of the sieve. If the usable fiber suspension flows through the sieve from the inside to the outside, the rotor is arranged inside the sieve cylinder; If the inlet side of the sieve is on the outside, the rotor, starting from its axis, has a support which overlaps the sieve wall and to which the regions of the rotor which run past the outside of the sieve are fastened.
  • the invention also relates to those pressure sorters in which the kinematic conditions are just reversed, in which a sieve rotating about its axis and a stationary "rotor" are provided.
  • the rotor of such a pressure sorter has the task of preventing the sieve openings from becoming blocked by fiber aggregations or by impurities contained in the fiber suspension;
  • the rotor which is adjacent to the sieve inlet side, carries cleaning elements which circulate in the fiber suspension to be sorted and are designed such that they generate positive pressure surges in the fiber suspension on their upstream side and negative pressure surges on their rear side, which in turn cause rinsing and backflushing flows through the sieve openings.
  • Sieves with attached strips or incorporated grooves are subject to relatively high wear, especially when sorting fiber suspensions obtained from mixed waste paper or the like, which contain a substantial proportion of hard impurities, which lead to rapid wear on the edges of the strips and grooves; in addition, these screens are expensive to manufacture.
  • the latter also applies to sieves, in the sieve wall of which recesses have been worked in from the sieve inlet side in the region of the sieve openings.
  • the rotors of the known pressure sorters either have an arm cross attached to a central rotor shaft and strip-shaped cleaning vanes as cleaning elements, which are fastened to the outer ends of these arms, or the rotor has a circular-cylindrical jacket, on the side of which facing the sieve, cleaning elements are fastened, which are also how the above-mentioned strip-shaped cleaning wings have a wing-like profile in cross section to the rotor axis; in the latter case, the cleaning elements can likewise be strip-shaped cleaning wings, but rotors with a cylindrical cylindrical jacket are also known, on which short wing pieces are attached as cleaning elements, in order to pulsate in the fiber suspension, the so-called fibers, which leaves the pressure sorter and contains the useful fibers Good substance to avoid.
  • the invention now relates to novel cleaning blades for such pressure sorters, and it was based on the object to provide cleaning blades with which a high throughput of a pressure sorter can be achieved without having to use a sieve susceptible to wear or expensive to manufacture; Throughput is to be understood as the amount of fiber suspension that passes through the sieve openings per time unit and per unit area of the sieve.
  • this object can be achieved according to the invention in that at least some of the cleaning wings have at least areas (return areas) whose wing-like profile on the upstream side for pushing the fiber suspension away from the sieve at an acute angle - obliquely in the direction of rotation pointing to the sieve inlet side - is formed with a first flank facing the sieve and a second flank facing away from the sieve, the second flank forming an obtuse angle with the circumferential direction that at least one Part of the cleaning wing has at least areas (feed areas) which are arranged with respect to the return areas in such a way that the fiber
  • a rotor designed according to the invention can have free-standing, strip-shaped cleaning vanes, all or some of which are or are designed according to the invention, it being possible for a cleaning van according to the invention to be provided continuously or only in sections with a return area designed according to the invention.
  • a rotor designed according to the invention can also have a rotationally symmetrical jacket, the side of which facing the sieve is provided with cleaning blades according to the invention, for which the same applies as for the free-standing cleaning blades discussed above and designed according to the invention;
  • short wing pieces all or part of which are or are designed according to the invention, can also be placed on the rotor casing.
  • the fiber suspension ring of higher consistency forming on the sieve inlet side by fractionation and rotating at a lower speed than the rotor is conveyed away from the sieve, so that it mixes at a radial distance from the sieve with fiber suspension of lower consistency before this part of the Fiber suspension comes back to the sieve.
  • the fiber suspension portions pushed away from the sieve inlet side by the return areas according to the invention are not only fed back through the feed areas according to the invention to the sieve inlet side, but also as a result of the pressure gradient between the inlet of the pressure sorter for the fiber suspension to be sorted and the pressure sorter outlet.
  • This known pressure sorter has a rotor rotating on the inlet side of a cylindrical screen, the circumference of which is formed by first and second sheet metal strips alternating in the direction of rotation of the rotor. All these metal strips have the same wall thickness everywhere (ie no wing-like profile) and extend parallel to the rotor axis.
  • the first sheet metal strips are slightly curved in cross section, slightly tapered at the front and form an obtuse angle with the direction of rotation, whereby they are set such that thickened suspension parts resulting on the sieve inlet side are pushed away from the sieve inlet side and conveyed in the direction of the rotor axis.
  • the second metal strips are absolutely flat and oriented exactly radially with respect to the rotor axis; the suspension parts pushed away from the sieve inlet side by the first sheet metal strips are thrown outward again in the radial direction against the sieve inlet side by the respectively subsequent second sheet metal strip.
  • the rotor of this known pressure sorter differs from the first embodiment described above only in that the first sheet metal strips are absolutely flat and in that the second sheet metal strips are inclined with respect to the radial direction, namely counter to the direction of rotation of the rotor.
  • the sheet metal strips of the rotor of this known pressure sorter do not have an airfoil-like profile, which is a prerequisite for the generation of the positive and negative pressure surges mentioned above, the rotor of this known pressure sorter also leads to impermissibly high pulsations in those leaving the pressure sorter useful fibers containing Fiber suspension (the so-called good substance), which would lead to faults in the so-called headbox of a paper machine connected downstream of the pressure sorter, an effect which is prevented in the rotor according to the invention by the fact that its cleaning wing, which has a wing-like profile, and thus the first flanks facing the screen their return areas run approximately parallel to the sieve inlet side.
  • a rotor according to the invention has free-standing or bar-shaped cleaning vanes placed on a rotor jacket, part of these cleaning vanes can be designed continuously or in sections so that the feed areas according to the invention are thereby formed; this would be the case with strip-shaped cleaning wings e.g. possible to design successively cleaning wings alternately as return areas and as feed areas, in each case over the entire length of the cleaning wing.
  • wing pieces In the case of a rotor with a rotationally symmetrical jacket and attached, relatively short wing pieces, on the other hand, a certain number of wing pieces will be designed as return areas and others as feed areas, although it would of course also be conceivable to have a wing piece over part of its length as a return area and over another part its length as a feed area.
  • the sorting fiber suspension is fed to the rotationally symmetrical sieve from one end thereof, so that the suspension flows helically from the inlet end of the sieve to the other end of the sieve inlet side due to the relative rotation of the sieve and rotor.
  • return areas and feed areas are arranged relative to one another in such a way that - seen in the direction of rotation - return areas and feed areas alternate successively, the helical shape Flow of the fiber suspension to be sorted along the sieve inlet side results in suspension that is pushed away from a return area from the sieve inlet side next to a feed area, in particular if the length of the return areas and the feed areas measured in the direction of the rotor axis is identical and the offset is equal to this length.
  • the first flank of the return areas facing the sieve runs approximately parallel to the circumferential direction, although this flank can also form an acute angle opening to the rear with the circumferential direction.
  • the first-mentioned embodiment is more advantageous because then this first flank does not bring about a pressure drop in the fiber suspension adjacent to the sieve inlet side, which would counteract the displacement of the fiber suspension from the sieve inlet side by the second profile flank of the return region, not immediately behind the leading edge of a return region.
  • a rotor In order to feed the part of the fiber suspension pushed away from a return area from the screen inlet side as completely as possible to a feed area (due to the helical flow profile of the fiber suspension or the inclination of the cleaning blades relative to the rotor axis), a rotor is recommended which has a rotationally symmetrical lateral surface facing the screen. on which the cleaning blades are placed, the approximately acute-angled profile part of the return areas being arranged at a radial distance from the rotor jacket surface, so that the return area together with its acute-angled profile part and the rotor lateral surface forms a channel running transversely to the direction of rotation.
  • the measures according to the invention have a particularly advantageous effect if the portions of the fiber suspension to be sorted, which are pushed away from the return areas by the screen, are also fed back under the action of the centrifugal forces to the screen inlet side, i.e. if the rotor according to the invention is intended to circulate adjacent the inside of the sieve; this means that in preferred embodiments of the rotor according to the invention, the first flanks of the cleaning blades are on the outside of the rotor.
  • the profile of the cleaning vanes in the circumferential direction behind the first flank has a third flank facing the sieve, which flank opens a rearward part with the circulating direction forms an acute angle.
  • the return areas in the direction of the rotor axis in addition to the first flank have an inclined side surface facing the inlet end of the sieve or rotor, which forms a run-up surface rising towards the sieve for a flow oriented from the inlet end in the direction of the rotor axis.
  • rotors with short staggered wing sections are recommended for headbox installations to avoid pulsations in the headbox.
  • rotors according to the invention are recommended, in which at least some of the cleaning blades, preferably all cleaning blades, are designed as strips which run transversely to the direction of circulation and approximately parallel to the screen inlet side, along which return and feed areas alternate in succession. This creates particularly intense turbulence in the fiber suspension to be sorted.
  • the strips - in the direction of the rotor axis - form an angle between approximately 5 ° and approximately 45 ° with the rotor axis.
  • the strips over one greater part of their length, which faces the inlet end of the sieve and preferably makes up about 2/3 of the length of the cleaning wing, with the rotor axis a smaller angle than the remaining, shorter part of the strips; Conversely, this means that the shorter parts of the strips facing the drain end of the sieve form a larger angle with the rotor axis.
  • the pressure sorter 10 shown in FIG. 1 has a housing 12 with an inlet connection 14 for the fiber suspension to be sorted, an outlet connection 16 for the so-called accept material, ie for that part of the fiber suspension that has passed through the screen of the pressure sorter and contains the usable fibers. and an outlet nozzle 18 for the so-called reject material, namely the part of the fiber suspension retained by the screen of the pressure sorter, which contains the impurities and fiber agglomerations.
  • the housing 12 which, with the exception of the connecting pieces 14, 16 and 18, is designed to be rotationally symmetrical, in particular circular-cylindrical, with respect to an axis 20, two annular partition walls 22 and 24 are fastened which carry a screen cylinder 26.
  • This has a plurality of screen openings 28 and forms with the housing 12 between the partitions 22 and 24 an outer annular space 30, the so-called accept material space.
  • a rotor 32 which, in the embodiment shown, has a closed, circular-cylindrical rotor jacket 34 and whose axis, like the axis of the screen cylinder 26, coincides with the axis 20 of the housing 12.
  • a housing base 36 is fastened below the rejects outlet nozzle 18, which supports a bearing 38 for a rotor shaft 40, to which the rotor 32 is fastened in a manner not shown and which can be driven by means of a pulley 42 fastened to the rotor shaft.
  • the direction of rotation or rotation of the rotor 32 is indicated by the arrow R in FIG. 1. Since the outer diameter of the rotor jacket 34 is somewhat smaller than the inner diameter of the screen cylinder 26, these two elements of the pressure sorter 10 form an inner annular space 46, in which the fiber suspension to be sorted flows helically from top to bottom, and the part of the fiber suspension retained by the screen cylinder 26 passes into a reject space 48 below the rotor 32 and above the housing base 36, into which the reject outlet port 18 opens.
  • a plurality of strip-shaped cleaning vanes 50 Attached to the outside of the rotor shell 34 are a plurality of strip-shaped cleaning vanes 50 which are arranged at equal intervals from one another in the circumferential direction R and which, in the side view, form an acute angle ⁇ perpendicular to the axis 20, which is preferably between approximately 5 ° and approximately 45 ° and can change from top to bottom along rotor shell 34, ie the cleaning wings 50 need not have the shape of straight strips. As can be clearly seen in FIG. 1, the cleaning wings 50 alternately form successive return areas 52 and feed areas 54 in the longitudinal direction of the ledge, which will be described in more detail below.
  • the fiber suspension to be sorted in the pressure sorter 10 is fed under pressure into the inlet connection 14 and flows, since the rotor 32 is closed at the top, from above into the inner annular space of the pressure sorter 10.
  • the fiber suspension to be sorted flows through the inner annular space 46 in a helical pattern from top to bottom, the part of the fiber suspension containing the individual, usable fibers passing through the screen openings 28, entering the accept material space 30 and the pressure sorter 10 via the accept material Exhaust port 16 leaves.
  • the portion of the fiber suspension retained by the screen cylinder 26, namely the rejects, leaves the pressure sorter via the reject space 48 and the reject outlet port 18.
  • Each of the return areas 52 has an acute-angled profile part 52a at the front in the circumferential direction R with a first flank 52b facing the screen cylinder 26 and a second flank 52c facing away from the screen cylinder.
  • the first flank 52b runs approximately parallel to the screen cylinder 26 or to the direction of rotation R, although a small, backward opening acute angle between the first flank 52b and the direction of rotation R is possible.
  • the second flank 52c forms an obtuse angle ⁇ with the circumferential direction R and it merges in the direction of the rotor jacket 34 into a wall 52e which is approximately radially perpendicular to the rotor axis 20, so that each return region 52 with its second flank 52c and its radial extending wall 52e together with the rotor jacket 34 forms a channel 56 which extends approximately transversely to the circumferential direction R.
  • Each of the feed areas 54 has a first flank 54b in the circumferential direction R at the front, which forms an acute angle ⁇ in section perpendicular to the rotor axis 20 with the circumferential direction R, which opens towards the front.
  • the return areas 52 and the feed areas 54 have third flanks 52d and 54d which are aligned with one another and which form an acute angle ⁇ with the circumferential direction R, which opens towards the rear.
  • the rotating rotor 32 with its cleaning blades 50 now causes them to generate positive and negative pressure surges in the fiber suspension to be sorted, namely in the fiber suspension in the direction of rotation R in front of the cleaning blades 50 positive pressure surges and in the region of the third flanks 52d and 54d negative pressure surges.
  • the positive pressure surges occurring in front of the cleaning vanes force an increased flow through the screen openings 28, while the negative pressure surges occurring in the area of the falling flanks 52d and 54d bring about a backwashing effect at the screen openings 28.
  • the thickened fiber suspension in the channels 56 is guided downwards along the relevant cleaning van according to FIG. 1 to the respectively adjacent feed area 54 and through its first flank 54b fed back to the screen inlet side 26a; due to the inclination of the first flank 54b by the angle ⁇ , the fiber suspension portion deflected in the direction of the sieve inlet side meets parts of the fiber suspension which flow as a result of the circumferential cleaning blades 50 in the vicinity of the sieve cylinder 26 in the circumferential direction R, so that not only a mixture of these in the vicinity of the sieve inlet side 26a in the direction R revolving fiber suspension portions with the fiber suspension portions deflected along the first flanks 54b of the feed regions 54 in the direction of the sieve inlet side 26a, but rather due to the almost opposite currents, relatively strong turbulence which causes the formation of a nonwoven fabric in the vicinity of the Prevent screen inlet side 26a.
  • the design of the cleaning wings 50 according to the invention thus leads to rinsing and backwashing impulses at the screen openings 28, it counteracts the formation of thickened fiber suspension fractions in the vicinity of the screen inlet side 26a, and finally it causes turbulence in the vicinity of the screen inlet side 26a, which counteracts the formation of a nonwoven fabric .
  • the return areas 52 are finally at the top (see FIG. 3 and 4) are provided with inclined side surfaces 50d, which provide a lower flow resistance to the flow component of the fiber suspension in the inner annular space 46, which is directed downwards, than if the return areas 52 of the cleaning vanes 50 were provided on both sides with side surfaces which run approximately perpendicular to the rotor axis 20 , as is the case with the lower side surfaces 50e.
  • the cleaning blades 50 do not have to have the same inclination ⁇ with respect to the rotor axis 20 everywhere, as is the case with the cleaning blades shown in FIG. 1.
  • the lower third of the cleaning blades 50 is more inclined with respect to the rotor axis 20 than the upper two thirds of the cleaning blades 50, ie the strip-shaped cleaning blades are bent in this variant.
  • the reject material which is already strongly thickened in the lower third of the screen cylinder 26, to be pushed more quickly into the reject agent space 48.
  • the cleaning vanes 50 are broken down into individual short vane sections corresponding to the return areas 52 and the feed areas 54, which are arranged approximately evenly distributed on the circumference of the rotor shell 34.
  • the return areas 52 would be arranged at the same locations on the rotor shell as the return areas 52 of the strip-shaped cleaning vanes 50, and the feed areas 54 would be arranged in the circumferential direction R between the cleaning vanes 50.
  • the rotor is designed as an open structure, ie it does not have a rotor jacket, and the cleaning blades are connected to the rotor shaft via radially extending support arms.
  • the pressure sorter according to FIGS. 5 to 7 is of the same design as the pressure sorter according to FIGS. 1 to 4, so that the same reference numerals as in FIGS. 1 to 4 have been used for corresponding parts, but with the addition of a dash. It should therefore also be sufficient if only the design of the rotor of the pressure sorter according to FIGS. 5 to 7 is explained below.
  • the rotor 32 'of the pressure sorter 10' shown in FIGS. 5 to 7 has star-shaped, ie radially extending arms 34 'fastened to the rotor shaft 40', and a cleaning wing 50 'is fastened to each of these arms.
  • These cleaning vanes are again formed in the form of strips, and return regions 52 ′ and feed regions 54 ′ alternate along each of these cleaning vanes.
  • the return areas 52 'again have a profile part 52a' with an acute cross-section with a first flank 52b ', which runs approximately parallel to the direction of rotation R, and a second flank 52c', which is oriented with the direction of rotation R. forms an obtuse angle ⁇ .
  • the adjacent feed areas 54 ' have on their upstream side a first flank 54b' facing the sieve inlet side 26a, which forms an acute angle ⁇ with the circumferential direction R, and the back of the return areas 52 'and the feed areas 54' is behind by third flanks 52d ' or 54d ', which form an acute angle ⁇ with the direction of rotation R, which opens towards the rear.
  • the fiber suspension portions adjacent to the sieve inlet side 26a are pushed inward in the radial direction inward from the sieve inlet side by the second flanks 52c 'of the return regions 52 and, after mixing with fiber suspension portions of lower consistency, are pushed back in the direction by the first flanks 54b' of the feed regions 54 ' the screen inlet side 26a is deflected so that the desired turbulence results.
  • the cleaning blades 50 ′ thus produce the same effects as the cleaning blades 50.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Filtration Of Liquid (AREA)
EP90124702A 1990-01-06 1990-12-19 Rotor für Drucksortierer zum Sortieren von Fasersuspensionen Expired - Lifetime EP0436888B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4000248A DE4000248A1 (de) 1990-01-06 1990-01-06 Rotor fuer drucksortierer zum sortieren von fasersuspensionen
DE4000248 1990-01-06

Publications (3)

Publication Number Publication Date
EP0436888A2 EP0436888A2 (de) 1991-07-17
EP0436888A3 EP0436888A3 (en) 1991-08-21
EP0436888B1 true EP0436888B1 (de) 1995-09-27

Family

ID=6397683

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90124702A Expired - Lifetime EP0436888B1 (de) 1990-01-06 1990-12-19 Rotor für Drucksortierer zum Sortieren von Fasersuspensionen

Country Status (6)

Country Link
US (1) US5176261A (sv)
EP (1) EP0436888B1 (sv)
JP (1) JPH04153387A (sv)
CA (1) CA2033577A1 (sv)
DE (2) DE4000248A1 (sv)
FI (1) FI910062A (sv)

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FR2666598B1 (fr) * 1990-09-10 1994-05-27 Escher Wyss Gmbh Procede de separation, notamment de tri ou de fractionnement d'une suspension de pate a papier.
FI88414C (sv) * 1991-01-30 1993-05-10 Ahlstroem Oy Anordning för behandling av fibersuspension
FI92227C (sv) * 1992-04-23 1994-10-10 Ahlstroem Oy Anordning för behandling av fibersuspension
US5307939A (en) * 1992-07-13 1994-05-03 Ingersoll-Rand Company Screening apparatus for papermaking pulp
US5497886A (en) * 1992-07-13 1996-03-12 Ingersoll-Rand Company Screening apparatus for papermaking pulp
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US5341936A (en) * 1993-07-12 1994-08-30 Ingersoll-Rand Company Screening device for a fiber slurry, and a backwash means therefor
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FR2723543B1 (fr) * 1994-08-10 1996-10-11 Lamort E & M Perfectionnements aux tamis cylindriques munis d'un rotor.
DE29515338U1 (de) * 1995-09-25 1995-11-23 Heinrich Fiedler GmbH & Co. KG, 93057 Regensburg Flügel für Sortiervorrichtungen
WO1999046026A1 (en) * 1998-03-11 1999-09-16 Thermo Black Clawson Inc. Variable pressure screening
NL1009609C2 (nl) * 1998-07-10 2000-01-11 Constructie En Systeembouw Ver Inrichting voor het scheiden van vaste deeltjes uit een in hoofdzaak uit vloeistof bestaande substantie.
JP3396456B2 (ja) 2000-02-04 2003-04-14 三菱重工業株式会社 紙料精選装置
SE515896C2 (sv) * 2000-02-08 2001-10-22 Valmet Fibertech Ab Silanordning för fibersuspensioner samt en rotor för användning i en silanordning
JP4514009B2 (ja) * 2001-03-28 2010-07-28 株式会社Ｉｈｉ機械システム スクリーン装置
US6942104B2 (en) * 2003-09-02 2005-09-13 Gl&V Management Hungary Kft. Rotor with multiple foils for screening apparatus for papermaking pulp
WO2007050082A1 (en) * 2005-10-28 2007-05-03 Prime Solution, Inc. Rotary fan press
WO2007094967A1 (en) * 2006-02-16 2007-08-23 Kadant Black Clawson Inc. Pulb screen foil and method of use
DE102006008758A1 (de) * 2006-02-24 2007-08-30 Voith Patent Gmbh Rotor für einen Drucksortierer für Fasersuspensionen
FI120978B (sv) * 2007-03-30 2010-05-31 Advanced Fiber Tech Aft Trust Rotorelement för en silanordning och rotor
FI120913B (sv) * 2007-09-28 2010-04-30 Andritz Oy Anordning för silning av massa
DE102011084609B4 (de) * 2011-10-17 2016-08-04 Bundesdruckerei Gmbh Auftragswerk zum Auftragen von Streugut auf ein Substrat, mindestens ein Auftragswerk aufweisende Auftragsvorrichtung, Verfahren zum Auftragen von Streugut auf ein Substrat sowie Verwendung des Auftragswerkes
DE112013002676T5 (de) * 2012-05-25 2015-03-19 Aikawa Fiber Technologies Trust Rotorelement und Rotor für eine Siebvorrichtung
CN112642687A (zh) * 2020-12-03 2021-04-13 勤丰众成生物质新材料(南京)有限公司 环保型土壤修复生物炭基肥的制备装置及工艺
CN113502679B (zh) * 2021-06-02 2022-08-09 浙江金龙再生资源科技股份有限公司 一种废纸循环利用过程中轻重杂质复效分离的筛选装备

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Also Published As

Publication number Publication date
CA2033577A1 (en) 1991-07-07
JPH04153387A (ja) 1992-05-26
DE4000248A1 (de) 1991-07-11
US5176261A (en) 1993-01-05
EP0436888A2 (de) 1991-07-17
EP0436888A3 (en) 1991-08-21
DE4000248C2 (sv) 1991-10-17
FI910062A (fi) 1991-07-07
DE59009718D1 (de) 1995-11-02
FI910062A0 (fi) 1991-01-04

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