DK167934B1

DK167934B1 - Appliance for compressing and dewatering cellulose- containing and/or other fibrous materials

Info

Publication number: DK167934B1
Application number: DK592187A
Authority: DK
Inventors: Hans-Erik Kvarnstroem
Original assignee: Gnii Kvartsevogo Stekla
Priority date: 1986-03-12
Filing date: 1987-11-12
Publication date: 1994-01-03
Also published as: NO874588L; FI92478C; DK592187D0; ATE68515T1; AU7128187A; NO168430B; SE452331B; NO874588D0; DE3773927D1; DK592187A; WO1987005619A1; NO168430C; EP0301000A1; EP0301000B1; SE8601152L; FI884188A0; FI92478B; FI884188A; SE8601152D0

Abstract

A screw press, which compresses and dewaters more or less moist cellulose-containing and/or fibrous materials in pieces, e.g. waste paper, wood, grass, straw and other harvest products, cellulose, peat, bark and the like, includes a feed device (2) having an input portion (3) for material, which is to be compressed, and at least one first pressure cone (13) for a forceful compressing of the material, a discharge opening (26) for the compressed and dewatered product, a rotary screw (11), which extends from the input portion at least into said first pressure cone (13) as well as driving means (8, 9) to make the screw rotate. The core (27) of the screw and/or its thread (28) is eccentric in relation to the rotation axis (30) of the screw and in relation to the mean screw line of the core respectively, in at least some of the thread turns in one zone (V) of said first pressure cone, and the jacket of this pressure cone (13) is impermeable in said zone (V).

Description

DK 167934 B1DK 167934 B1

Den foreliggende opfindelse angår et apparat til komprimering og afvanding af fugtige celluloseholdige og/eller andre fibrøse materialer i stykform, såsom affaldspapir, træ, græs, halm og andre høstprodukter, cellulose, tørv, bark og 5 lignende materialer, hvilket apparat omfatter en indføringsdel for det materiale, som skal komprimeres og afvandes, en afvandingsdel og en fraførselsåbning til det komprimerede og afvandede produkt, en roterbar snegl eller snekke og drivorganer til rotation af sneglen, hvor sneglen er anbragt excen-10 trisk i forhold til sneglens rotationsakse eller i forhold til snekkekernens middelskruelinie.The present invention relates to an apparatus for compressing and dewatering moist cellulose-containing and / or other fibrous materials in unitary form such as waste paper, wood, grass, straw and other harvesting products, cellulose, peat, bark and similar materials, which apparatus comprises an insertion member for the material to be compressed and dewatered, a dewatering portion and a discharge opening for the compressed and dewatered product, a rotatable auger or auger and drive means for rotating the auger, the auger being eccentrically positioned relative to the auger axis of rotation or worm core medium helix.

Presser til fremstilling af briketter ud fra fibrøse materialer anvender cylindre og stempler som komprimeringsorganer. Ved hjælp af eksisterende konstruktioner kan 15 der baseret på dette princip briketteres materiale med fugtighedsprocenter på mindre end 20%. Snekke-.presser er også kendt i mange udførelsesformer til afvanding af fibermateriale og andre kompressible materialer i stykform. Udførelsesformer for sådanne snekkepresser kendes fra USA-20 patent nr. 2.615.385 og USA-patent nr. 4.121.967. Ved hjælp af disse og andre kendte snekkepresser kan materialer med meget højt fugtindhold ganske vist afvandes, men ikke i en sådan udstrækning som kræves ved fremstilling af brændselsbriketter. En grundlæggende vanskelighed, som ikke har kunnet 25 afhjælpes med den kendte teknik, er at få ledt vandet bort fra pressezonen ved de ret høje tryk, som kræves til opnåelse af en høj grad af væskefjernelse, uden at det komprimerede materiale samtidigt bliver presset ud sammen med væsken. Det er almindeligt at forsyne pressekonusen med afvandingsåbnin-30 ger, således som det fremgår af ovennævnte patentskrifters konstruktioner, men disse åbninger gør det umuligt at opnå de høje tryk, som kræves til vanduddrivning med henblik på opnåelse af meget høje tørstofindhold i det komprimerede materiale. Hvis trykket i pressekonusen hæves til meget store værdier, 35 vil det komprimerede materiale simpelthen blive ekstruderet DK 167934 B1 2 eller sprøjtet ud igennem åbningerne. Hvis på den anden side disse drænåbninger fjernes med henblik på at skabe forudsætninger for meget høje tryk i pressekonusen, vil vandet blive indespærret i denne. Det anses først og fremmest at være 5 denne problematik, som hidtil har forhindret anvendelse af snekkepresser til afvanding af fugtige fiberholdige materialer til meget høje tørstofindhold for fremstilling af sammenhængende presseemner.Presses for producing briquettes from fibrous materials use cylinders and pistons as compression means. Using existing structures, 15 material based on this principle can be briquetted with moisture percentages of less than 20%. Screw presses are also known in many embodiments for dewatering fiber material and other compressible materials in unit form. Embodiments of such worm presses are known from U.S. Patent No. 2,615,385 and U.S. Patent No. 4,121,967. With the aid of these and other known worm presses, very high moisture content materials can be dewatered, but not to the extent required in the manufacture of fuel briquettes. A basic difficulty which has not been remedied by the prior art is to get the water away from the press zone at the rather high pressures required to obtain a high degree of liquid removal without simultaneously compressing the compressed material. with the liquid. It is common to provide the press cone with dewatering openings as shown in the designs of the aforementioned patents, but these openings make it impossible to obtain the high pressures required for water expulsion to obtain very high solids content of the compressed material. If the pressure in the press cone is raised to very high values, the compressed material will simply be extruded or sprayed out through the openings. On the other hand, if these drainage openings are removed in order to create conditions for very high pressures in the press cone, the water will be trapped therein. It is first and foremost considered to be this problem, which has hitherto prevented the use of worm presses for dewatering moist fibrous materials to very high solids content for the production of cohesive press blanks.

Det er den foreliggende opfindelses formål at tilveje-10 bringe et apparat af den indledningsvis angivne art, og hvormed det er muligt at afvande og brikettere nævnte materialer af fugtindhold helt op til 60% til fremstilling af hårde, godt sammenhængende briketter med meget høje tørstofindhold. Dette formål og andre fordele opnås med en snekkepres-15 se ifølge opfindelsen, som er ejendommelig ved, at mindst en første pressekonus er indrettet til kraftig komprimering af materialet, at pressekonusens kappe eller væg er uigennemtrængelig i mindst en af sine zoner, at et kappe- eller vægparti med drænhuller set i materialets fremføringsretning er 20 anbragt før den første pressekonus, og at sneglen forløber fra indføringsdelen igennem det med drænhuller forsynede •kappeparti og ind i den af pressekonusens zoner, der har uigennemtrængelig væg. Det har vist sig, at hvis en snekkepresse udformes på denne måde, kan den afvandes meget 25 effektivt, selvom fugtindholdet i udgangsmaterialet er meget højt. Den foreliggende opfindelse er ikke baseret på nogen speciel teori, som gør krav på videnskabeligt at forklare, - hvorfor denne virkning opnås. Imidlertid tyder udførte eksperimenter på, at sneglen under sin rotationsbevægelse ælter mate-30 rialet ved gentagne gange at udsætte det for høje lokale trykforøgelser og trykfald, hvilket synes at bevirke dannelse af hulrum i det komprimerede materiale i skruegangen, i hvilke hulrum vand i væske- og/eller dampfase kan akkumuleres under • tryk til ved sneglens rotation og under indvirkning af tryk 35 fra pressegodset at evakueres bagud i sneglens skruegang.It is an object of the present invention to provide an apparatus of the kind set forth above, with which it is possible to dewater and briquette said materials of moisture content up to 60% to produce hard, well cohesive briquettes with very high solids content. This object and other advantages are achieved by a worm press according to the invention, characterized in that at least one first press cone is arranged to vigorously compress the material, that the cover or wall of the press cone is impermeable in at least one of its zones, that a sheath or wall portion with drainage holes seen in the feed direction of the material is disposed prior to the first press cone and the auger extends from the insertion portion through the cover portion provided with drainage holes and into the zone of the press cone having impermeable wall. It has been found that if a worm press is designed in this way, it can be dewatered very effectively even though the moisture content of the starting material is very high. The present invention is not based on any particular theory which claims to scientifically explain why this effect is obtained. However, experiments performed indicate that during its rotational motion, the auger kneads the material by repeatedly exposing it to high local pressure increases and decreases, which appear to cause formation of voids in the compressed material in the void in which voids water in the liquid. and / or vapor phase may accumulate under pressure to be evacuated backwards in the screw operation of the auger by the rotation of the auger and under the influence of pressure 35 from the press.

Det har ved forsøg med varierende udformning af sneglen ikke 3 DK 167934 B1 helt kunnet klarlægges, om det er excentriciteterne i sneglens kerne eller i sneglens skruegang, der var hovedårsagen til det ønskede resultat. Muligvis opnås en samvirken mellem excentriciteterne i sneglens kerne og i sneglens skruegang, og i 5 så fald bør såvel kernen som skruegangen gøres excentriske i dette omrade. Excentriciteten i sneglens skruegang opnås fortrinsvis ved at gøre den bølgeformet.It has not been possible to fully ascertain whether the eccentricities in the core of the auger or the screw auger were the main cause of the desired result in experiments with varying design of the auger. It is possible that a co-operation between the eccentricities of the auger core and the auger screw is achieved, and in this case, both the core and the auger should be made eccentric in this area. The eccentricity of the screw auger is preferably achieved by making it wavy.

Apparatet ér ifølge en'foretrukket udførelsesform udformet således, at det komprimerede materiales legeme i 10 eller ved drænåbningernes område får revnedannelser, således at vandet fra det komprimerede materiales legemes centrale del kan undslippe gennem revnerne udad mod væggen eller kappen og derpå igennem dennes drænåbninger.The apparatus according to a preferred embodiment is designed such that the body of the compressed material in the 10 or at the area of the drain openings causes cracking, so that the water from the central part of the compacted material can escape through the cracks outwardly against the wall or the casing and then through its drain openings.

Apparatet ifølge opfindelsen vil i det følgende blive 15 nærmere forklaret i forbindelse med en foretrukken udførelsesform og under henvisning til tegningen, hvor fig. 1 viser et længdesnit gennem en snekkepresse, fig. 2 snekkepressens snegl set fra siden, fig. 3 den i fig. 2 viste pressesnegl set fra oven, og 20 fig. 4 et længdesnit i en afvandingscylinder og en tilsluttet første pressekonus.The apparatus of the invention will now be described in more detail in connection with a preferred embodiment and with reference to the drawing, in which: FIG. 1 is a longitudinal section through a worm press; FIG. 2 is a side view of the worm press auger; FIG. 3 shows the one shown in FIG. 2 from above, and FIG. 4 is a longitudinal section of a drainage cylinder and a connected first press cone.

Den i fig. 1 viste snekkepresse er monteret på et fundament 1. Snekkepressen hviler på fundamentet 1 med sit fremføringshus 2, som er forsynet med en indføringsdel 3. En 25 påfyldningstragt 4 er anbragt oven over indføringsdelen 3.The FIG. 1 the worm press is mounted on a foundation 1. The worm press rests on the foundation 1 with its feed housing 2, which is provided with an insertion part 3. A filling hopper 4 is arranged above the insertion part 3.

I tragten 4 er anbragt en nedstopper 5, der føres frem og tilbage i lodret retning og drives via en krumtap 6 og et transmissionsorgan 7 af en drivaksel 8 på en elektromotor 9.A hopper 5 is arranged in the hopper 4, which is reciprocated in a vertical direction and is driven via a crank 6 and a transmission means 7 by a drive shaft 8 on an electric motor 9.

Drivakslen 8 strækker sig gennem et akselhus 10 og er 30 udformet til at drive snekkepressens snegl 11.The drive shaft 8 extends through a shaft housing 10 and is designed to drive the worm 11 auger.

Sneglen 11 forløber igennem indføringsdelen 3 samt igennem en afvandingscylinder 12 og til sidst ind i en første pressekonus 13. En anden pressekonus 14, der udgør en direkte forlængelse af den første pressekonus 13 og et afsluttende 35 mundstykke 15 med en tredie konisk indsnævring 16.The auger 11 extends through the insertion portion 3 as well as through a dewatering cylinder 12 and finally into a first press cone 13. A second press cone 14 constitutes a direct extension of the first press cone 13 and a final 35 nozzle 15 with a third conical constriction 16.

Afvandingscylinderen 12 og den indledende del af den tilsluttede første pressekonus 13, fig. 4, er på deres inderside på kendt vis forsynet med langsgående stænger 17, der 4 DK 167934 Bl forhindrer det komprimerede materiale i at rotere i sneglens skruegang sammen med sneglen 11. I sin bageste del, denne zone er betegnet 18, er væggen eller kappen i afvandingscylinderen 12 forsynet med et antal drænhuller 19, som er 5 fordelt langs kappens omkreds. De kan have en diameter på 3 mm. Drænzonen 18 er omsluttet af en kappe eller væg 20, der opsamler vand, som strømmer eller trykkes ud igennem hullerne 19. En drænledning fra kappen 20 har henvisningsnummer 21. Den første pressekonus 13 er i sin mellemste del omslut-10 tet af en kølekappe 22, hvorigennem der strømmer kølevand.The dewatering cylinder 12 and the initial portion of the connected first press cone 13, fig. 4, are known on their inner side with longitudinal rods 17 which prevent the compressed material from rotating in the helix screw together with the screw 11. In its rear part, this zone is designated 18, the wall or sheath is in the drainage cylinder 12 provided with a plurality of drain holes 19 distributed along the circumference of the sheath. They can have a diameter of 3 mm. The drain zone 18 is enclosed by a sheath or wall 20 which collects water flowing or pushed through the holes 19. A drain line from the sheath 20 has reference number 21. The first pressing cone 13 is in its middle part enclosed by a cooling sheath 22 , through which cooling water flows.

Skruegangen eller vingerne 28 på sneglen 11 forløber ikke ind i den anden pressekonus 14, som via et gevind 23 er fastspændt til den første pressekonus 13, men til gengæld forløber en forlængelse af sneglens 11 kerne 27 med et forlæn-15 gelsesstykke 45 ind i den anden pressekonus 14. Denne anden pressekonus 14 er omsluttet af en kølekappe 24, hvorigennem der strømmer kølevand til fjernelse af varme, som dannes også i denne anden pressekonus. Det afsluttende mundstykke 15, hvis afsluttende indvendige diameter 25 er valgt i overens-20 stemmelse med de fremstillede briketters ønskede diameter, er også fastgjort på den foregående pressekonus ved hjælp af et gevind.The screw thread or blades 28 on the auger 11 do not extend into the second press cone 14, which is secured via a thread 23 to the first press cone 13, but in turn extend the core 27 of the auger 11 with an extension piece 45 into it. second press cone 14. This second press cone 14 is enclosed by a cooling jacket 24 through which cooling water flows to remove heat which is also formed in this second press cone. The final nozzle 15, whose final inside diameter 25 is selected in accordance with the desired diameter of the briquettes produced, is also secured to the previous press cone by a thread.

Sneglens 11 kerne 27 har en aftagende diameter i sin længde og delvist også en varierende form. Sneglens skruegang 25 .28 har en varierende stigning i sneglens længde. Langs sin hoveddel har skruegangen 28 en cylindrisk ydre kontur, som i området for den første pressekonus 13 overgår til en konisk form. Sneglen 11 kan, hvad angår den varierende stigning for skruegangen 28, opdeles i et antal zoner I-V .The core 27 of the auger 11 has a decreasing diameter in its length and partly also a varying shape. The screw thread 25 .28 has a varying increase in the length of the screw. Along its main part, the screw passage 28 has a cylindrical outer contour which, in the region of the first press cone 13, transitions into a conical shape. The auger 11 can be divided into a number of zones I-V with respect to the varying pitch of the screw passage 28.

3f\3f \

w Zone I - en stor stigning - en skruevinding 28Aw Zone I - a large pitch - a screw winding 28A

Zone II - en moderat stigning - tre skruevindinger 28BZone II - a moderate increase - three screw turns 28B

Zone III - en meget stor stigning - en skruevinding 28CZone III - a very large increase - a screw twist 28C

Zone IV - en moderat stigning - tre skruevindinger 28DZone IV - a moderate increase - three screw turns 28D

Zone V - en lille bølgeformet stign. - tre skruevindinger 28EZone V - a small wave-shaped pitch. - three screw turns 28E

35 Den store stigning i de første tre vindinger 28A i zone I gør det lettere for sneglen 11 at modtage grovere mate-‘ rialer, såsom store papirklumper, plader og lignende. I den 5 DK 167934 B1 næste zone II i indføringsdelen 3 er sneglens stigning noget mindre, og i disse tre skruevindinger 28B finder en vis komprimering af materialet sted. I den indledende skruevinding 28C i zone III i afvandingscylinderen 12 bevirker den meget store 5 sneglestigning påny iturivning af det komprimerede materiale, hvilket resulterer i et stort antal revner i materialet med overvejende radial retning. Derpå bliver materialet påny komprimeret i de følgende tre skruevindinger 8D i zone IV i afvandingscylinderen 12. I den afsluttende zone V i den første 10 pressekonus 13 har sneglen 11 konisk form. Den sidste skruevinding i zone IV strækker sig ind i pressekonusen 13 med en moderat stigning. De følgende tre skruevindinger 28E har en meget lille bølgeformet stigning. Denne udformning sammen med den konisk aftagende form for skruevindingen fører til en 15 meget kraftig ekstra komprimering af det komprimerede materiale, medens et meget højt tryk og høj temperatur dannes.The large increase in the first three turns 28A of zone I makes it easier for the auger 11 to receive coarser materials such as large paper lumps, sheets and the like. In the next zone II of the insertion part 3, the pitch of the auger is somewhat smaller, and in these three screw turns 28B some compression of the material takes place. In the initial screw winding 28C in zone III of the dewatering cylinder 12, the very large 5 auger rise again causes tearing of the compressed material, resulting in a large number of cracks in the material of predominantly radial direction. The material is then compressed again in the following three screw turns 8D in zone IV of dewatering cylinder 12. In the final zone V of the first 10 press cone 13, the auger 11 has a conical shape. The last screw twist in zone IV extends into the press cone 13 with a moderate increase. The following three screw turns 28E have a very small wavy pitch. This configuration, together with the tapered form of the screw winding, results in a very strong extra compression of the compressed material, while a very high pressure and high temperature are formed.

Den bølgeformede eller slingrende form for skruevindingen resulterer i en komprimering af det komprimerede materiale stødvis, hvilket har vist sig at være særligt effektivt, når 20 maksimal komprimering søges opnået, og synes samtidigt at lette fjernelsen af vandet. Sidstnævnte virkning synes at optræde i de slip- eller aflastningsfaser, som efterfølger hver bølgetop på skruevindingen.The wavy or winding form of the screw winding results in a compression of the compressed material shockingly, which has proven to be particularly effective when seeking maximum compression and at the same time seems to facilitate the removal of the water. The latter effect appears to occur in the slip or relief phases that follow each wave peak on the screw winding.

Kernen 27 på sneglen er udformet på en sådan måde i 25 skruegængen mellem skruevindingerne, at skruegængens bund i aksiale snit på i og for sig kendt vis er skålformet. Middeldiameteren for sneglens kerne 27 er i de første tre zoner I-III og også i omtrent halvdelen af den fjerde zone IV uændret den samme. Formen af sneglens kerne 27 er imidlertid 30 i den resterende del ret kompliceret. Diameteren i skruegængen X er således mindre end diameteren i den foregående skruevinding. Derefter falder værdien af diameteren yderligere, men i forskellig grad på forskellige sider af rotationsakslen, som ses i fig. 2 og 3. Medens kernens tværsnit aftager symmetrisk 35 konisk i et aksialt snit, jfr. fig. 2. aftager tværsnittet usymmetrisk i et snit, der står vinkelret på det forrige, jfr. fig. 3. Den mindste radius R1 i skruegangbunden 40 er -s.The core 27 of the auger is formed in such a manner in the screw thread between the screw turns that the bottom of the screw thread in axial section is, in a manner known per se, cup-shaped. The mean diameter of the auger core 27 in the first three zones I-III and also in about half of the fourth zone IV is unchanged. However, the shape of the auger core 27 is rather complicated in the remainder 30. Thus, the diameter of the screw thread X is smaller than the diameter of the previous screw thread. Thereafter, the value of the diameter falls further, but to varying degrees on different sides of the rotary shaft, as seen in FIG. 2 and 3. While the cross-section of the core symmetrically decreases conically in an axial section, cf. FIG. 2. decreases the cross-section asymmetrically in a section perpendicular to the previous one, cf. FIG. 3. The smallest radius R1 in the screw base 40 is -s.

DK 167934 B1 6 således væsentligt mindre end den mindste radius i skruegangbunden 41 på den modsatte side af sneglen. Det samme forhold gælder i den næste skruevinding, hvori radiusen er mindre end . En yderligere ejendommelighed er, at radius 5 R-j er mindre end den største radius R^ i skruegangbunden 42. Både skruegangen 28 og kernen 27 er udformet således, at det komprimerede materiale udsættes for kraftige lokale trykstigninger efterfulgt af trykfald i pressekonusen 13, som er uigennemtrængelig. Dette bevirker med stor sikkerhed, at det 10 komprimerede materiale æltes eller masseres grundigt i pressekonusen 13, således at der dannes hulrum, hvori vand og damp kan opsamles under højt tryk og ved en høj temperatur. Disse hulrum presses bagud. Hvorfor dette sker er vanskeligt at forklare, og det kan kun konstateres som en kendsgerning.Thus, substantially smaller than the smallest radius of the screw gangway 41 on the opposite side of the auger. The same ratio applies in the next screw winding in which the radius is less than. A further feature is that radius 5 Rj is smaller than the largest radius R 2 in the screw gangway 42. Both the screw passage 28 and the core 27 are designed such that the compressed material is subjected to strong local pressure increases followed by pressure drops in the press cone 13 which is impervious. . This causes, with great certainty, that the compressed material is kneaded or massaged thoroughly in the press cone 13 so as to create voids in which water and steam can be collected under high pressure and at a high temperature. These cavities are pushed backwards. Why this happens is difficult to explain and can only be stated as a fact.

15 Vand og damp, der er akkumuleret i disse hulrum, transporteres således gradvist bagud, hvilket sker stødvist. Eftersom . kun en begrænset mængde damp komprimeres under højt tryk i hvert hulrum, elimineres også de risici, som ellers er forbundet med høje damptryk.Thus, water and steam accumulated in these voids are gradually transported backwards, which occurs shockingly. Because. only a limited amount of steam is compressed under high pressure in each cavity, the risks that are otherwise associated with high vapor pressure are also eliminated.

20 Den afsluttende tap 45 er excentrisk anbragt, men for løber parallelt med sneglens aksel, hvilket betyder, at tappens spids 46 under sin rotation beskriver en lille cirkel til forhindring af, at den kanal, som sneglens kerne 27 har dannet i midten af det komprimerede materiales legeme, til-25 stoppes. Det færdigtbriketterede materiale, som presses ud igennem det afsluttende mundstykkes 15 afgivelsesåbning 26, bliver derved rørformet, således at damp også kan forlade pressekonusen 13 i denne centrale kanal, hvori en passage hele tiden holdes fri ved hjælp af den excentrisk roterende tap 45. 30The final pin 45 is eccentrically disposed but runs parallel to the auger shaft, which means that the tip 46 of the stud, during its rotation, describes a small circle to prevent the channel formed by the auger core 27 in the center of the compressed the body of materials is stopped. The finished briquette material which is pressed out through the discharge opening 26 of the nozzle 15 is then tubular so that steam can also leave the press cone 13 in this central channel in which a passage is kept free by the eccentric rotary pin 45. 30

Den bølgeformede eller bugtende form for skruegangen i den sidste zone V fremgår af fig. 2. Således har sneglens vinger i denne zone i de første vindinger to fremadrettede dele 46, 47 af.bølgetopform. Tangenter 50 til disse toppe danner således en vinkel Ά med en tænkt tangent til skruegan-35 gens eller keglebladets normale form, således som det fremgår af fig. 2.The corrugated or curving form of the screw passage in the last zone V is shown in fig. 2. Thus, the wings of the auger in this zone in the first turns have two forward portions 46, 47 of waveform. Thus, tangents 50 to these peaks form an angle Ά with a thought tangent to the normal shape of the screw thread or cone blade, as shown in FIG. 2nd

7 DK 167934 B17 DK 167934 B1

Til at forbedre slippet eller spillerummet i det afsluttende mundstykke 15 kan dette gøres roterbart. Drivorganer til rotation af mundstykket er vist symbolsk og markeret med henvisningsnummer 51.To improve the release or clearance in the final nozzle 15, this can be made rotatable. Drives for rotating the nozzle are shown symbolically and marked with reference number 51.

Claims

8 DK 167934 Bl Patent claim.

An apparatus for compressing and dewatering moist, cellulosic and / or other fibrous materials in unitary form, such as waste paper, wood, grass, straw and other harvesting products, cellular material, peat, bark and similar materials, comprising an insert (3) for the material to be compressed and emptied of water, a dewatering portion and a discharge opening for the compressed and dewatered product, a rotatable auger or auger (11) and drive means (8, 9) for rotating the auger (11), wherein the auger ( 11) is disposed eccentrically with respect to the axis of rotation of the screw (1) or with respect to the mean screw line of the screw core, characterized in that at least a first press cone (13) is arranged to vigorously compress the material so that the cover or wall of the press cone is impermeable. at least one of its zones that a sheath or wall portion (12) with drain holes (19) seen in the direction of feed of the material is disposed before the first press cone (13), and that the cone extends from the insertion section through the drainage-covered casing portion and into the zone of the press cone having impermeable wall.

Apparatus according to claim 1, characterized in that the screw thread of the auger is tapered in the area of the press cone.

Apparatus according to claim 1, characterized in that the screw threading in the region of the press cone (13) is corrugated.

Apparatus according to claim 1, 2 or 3, characterized in that the core (27) of the auger has an extension in the form of an eccentric pin (45).

Apparatus according to claim 3, characterized in that the screw thread (28) of the auger has a substantially greater increase in or near the drain hole (19) zone for tearing the press material to facilitate the flow of water from the central parts of the press material back towards the sheath or wall and the drainage holes.

Apparatus according to claim 4, characterized in that the eccentric pin (45) extends into a second press cone (14).