WO2003018906A2 - Equipment for preparation of paper stock - Google Patents

Equipment for preparation of paper stock Download PDF

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Publication number
WO2003018906A2
WO2003018906A2 PCT/EP2002/009106 EP0209106W WO03018906A2 WO 2003018906 A2 WO2003018906 A2 WO 2003018906A2 EP 0209106 W EP0209106 W EP 0209106W WO 03018906 A2 WO03018906 A2 WO 03018906A2
Authority
WO
WIPO (PCT)
Prior art keywords
equipment
tank
paper stock
filtration unit
stock
Prior art date
Application number
PCT/EP2002/009106
Other languages
French (fr)
Other versions
WO2003018906A3 (en
Inventor
Giancarlo Dal Maso
Original Assignee
Comer Spa
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 Comer Spa filed Critical Comer Spa
Priority to AU2002331243A priority Critical patent/AU2002331243A1/en
Publication of WO2003018906A2 publication Critical patent/WO2003018906A2/en
Publication of WO2003018906A3 publication Critical patent/WO2003018906A3/en

Links

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
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/30—Defibrating by other means
    • D21B1/32—Defibrating by other means of waste paper
    • 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
    • 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
    • D21D5/04—Flat screens
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/64—Paper recycling

Definitions

  • the presept invention relates to an equipment, particularly adapted to prepare paper stock obtained by kneading waste paper.
  • a known embodiment of said plants has a plurality of kneaders with cylindrical tank provided with a helical impeller, each kneader being provided downstream with a rotary basket filter to remove the contraries from the fibrous stock.
  • the plants of such kind have the limitation that the operation of each couple consisting of kneader and filter is discontinuous because after a predetermined operation time, both the kneader and the filter must be stopped to allow discharge of the separated contraries.
  • equipments are made having a single kneader essentially comprising a cylindrical container with horizontal axis inside provided with blades of various shapes carrying out kneading of waste paper when the cylinder is caused to rotate.
  • the kneader In the end part the kneader has a pre-filtering zone generally consisting of a foraminous surface retaining the bigger contraries that are thus separated before the fibrous stock comes out from the kneader.
  • the stock is then filtered again through a plurality of filters cascade arranged downstream the kneader, comprising a cyclone filter receiving the fibrous stock coming out from the kneader, followed by a plurality of rotary basket filters cascade arranged, each of them separating the polluting substances from the paper stock received from the preceding filter.
  • the number of filters arranged downstream the kneader is varying according to the kind of stock and contraries as well as the degree of filtration to be obtained.
  • the just described plant has the advantage to allow a continuous treatment of the paper stock but has still some drawbacks.
  • a first drawback consists in that the pre-filt ation stage carried out in the kneader is too little selective and this involves an excessive working load on the filters arranged downstream that being too loaded do not succeed to carry out an adequate separation of the residual contraries.
  • the present invention aims at overcoming said drawbacks. More particularly a first object is to provide an equipment for preparation of paper stock improving the operation of the filters arranged downstream the kneader.
  • Another object of the invention is to provide an equipment reducing the fragmentation of the polluting substances during the filtration phase of the paper stock.
  • a further object of the invention is to provide an equipment having a continuous cycle operation.
  • a last but not least object of the invention is to provide an equipment allowing to improve the quality of the paper stock in comparison with the quality that can be obtained with equivalent plants.
  • - at least a kneader provided with a rotary cylinder with horizontal axis adapted to treat waste paper in an aqueous environment to obtain said paper stock; - at least a collection tank for said paper stock coming out from said at least a kneader;
  • the static filtration unit comprises a container inside provided with a fixed foraminous plate and scraping means slidingly cooperating with the filtering surface of the fixed foraminous plate.
  • the foraminous plate is generally arranged orthogonal to the direction of advancement of paper stock inside the container, in which the plate defines a first chamber communicating with the pumping means and adapted to contain the paper stock to be filtered and a second chamber containing the filtered stock.
  • the filtering surface of the foraminous plate is facing the first chamber in which the scraping means are also arranged.
  • the filtered stock contained in the second chamber is conveyed through second pumping means to other filters for further filtration while the polluting substances settled on the bottom of the first chamber are periodically discharged.
  • the equipment reducing crushing of the polluting substances contained in the waste paper allows to obtain a paper stock of better quality relative to the stock that can be obtained with equivalent plants of the prior art.
  • - Fig. 1 shows a first embodiment of the equipment of the invention
  • FIG. 2 shows a constructional variation of the equipment of the invention
  • - Fig. 3 is a longitudinal section of the static filtration unit of the equipment of figs. 1 and 2;
  • Fig. 4 is a front view of the filtering plate and the scraping means of the static filtration unit of fig. 3.
  • the equipment of the invention generally indicated with reference 1 comprises a kneader generally indicated with 2, treating waste paper in an aqueous environment to obtain the paper stock; a collection tank generally indicated with 3 for the paper stock coming out from the kneader 2 and the pumping means generally indicated with 4, adapted to transfer the paper stock from the collection tank 3 to filtering means generally indicated with 5.
  • the kneader 2 is a kneader of known type comprising a cylindrical container 2a rotating around a longitudinal axis X and provided with a loading inlet 2b to introduce ⁇ e waste paper to be treated in an aqueous environment, a pre-filter 2c adapted to carry out a filtration of the bigger contraries and arranged at the exit of the paper stock and a discharge outlet 2d arranged on the bottom of the container to remove the polluting substances separated by filtration.
  • the filtering means 5 comprise at least a static filtration unit 6 arranged immediately downstream the first pumping means 4 for the paper stock to be filtered.
  • said static filtration unit 6 that can be seen in the longitudinal section of fig. 3 and in the inner front view of fig. 4, comprises a vessel 7 in which a fixed foraminous plate 8 divides the internal room defining a first chamber 9 provided with a flange 10 connecting the pipe 11 feeding the paper stock to be filtered and a second chamber 12 receiving the stock filtered by the fixed foraminous plate 8 and provided with a flange 13 connecting the exit pipe 14 for the filtered paper stock.
  • the fixed foraminous plate 8 is arranged generally orthogonal to the direction V of flow of the paper stock in the vessel 7.
  • a proper valve 18 to be seen in fig. 1 allows to discharge the contraries separated by the static filtration unit 6 on the conveyor belt 19 carrying them to a collection storage 20.
  • the filtering surface 8a facing the first chamber 9 slidingly cooperating with scraping means generally indicated with 21 consisting as shown in fig. 4, of an impeller 22 provided with three scraping blades 23a, 23b, 23c each being in contact with the filtering surface 8a and having a crescent-like profile making the scraping action particularly efficient.
  • the peculiar feature of the static filtration unit 6 consists in that the impeller 22 which is being rotated by external driving means of known type indicated with M in fig. 1 to which it is connected through the axis 24, rotates at a very low speed.
  • the static filtering unit 6 carries out an intermediate filtration between the filtration effected by the pre-filter 2c of the kneader 2 and the fine filtration effected by the final filters generally indicated with 25 substantially consisting of a cyclone filter followed by rotary basket filters that are fed by the filtered paper stock coming out from the static filtration unit 6 through pumping means 26.
  • pressure regulation and control means generally indicated with 27 are provided in the equipment.
  • said pressure regulation and control means 27 comprise a first tank 28 connected through a pipe 28a to the pipe 11 feeding the static filtering unit 6; a second tank 29 connected through a pipe 29a to the inlet of the collection tank 3; and a third tank 30 connected to the delivery side of the pumping means 4 preferably consisting of a pump 4a.
  • the third tank 30 is interposed between the first tank 28 and the second tank 29 and has a first overflow wall 31 separating from the first tank 28 and a second overflow wall 32 separating from the second tank 29.
  • the second overflow wall 32 is arranged at a height H2 relative to the ground line S, greater than the height H1 of the first overflow wall 31.
  • FIG. 2 A constructional variation of the equipment of the invention is shown in fig. 2 where one can see that said equipment generally indicated with 40, is different from the previously described equipment for a different embodiment of the pressure regulation and control means inside the static filtering unit 6, generally indicated with 41.
  • Said means comprise particularly a feeding valve 42 for the paper stock to be filtered, interposed between the pumping means 4 and the pipe 11 feeding the static filtration unit 6 as well as a safety valve 43 interposed between the pumping means 4 and the pipe 29a at the inlet of the collection tank 3.
  • An electriq electronic control and driving board generally indicated, with 44 is provided and comprises:
  • a sensing unit 44c connected to a pressure gauge 45 arranged inside the vessel 7 of the static filtration unit 6; and - a control and processing unit 44d connected to the driving units 44a, 44b and sensing unit 44c.
  • the equipment of the invention attains the intended objects in both embodiments hereinbefore described and illustrated. More particularly variations may be provided especially as to the design of filters arranged downstream the static filtration unit 6 or the pressure regulating means inside the filtration unit that may be different from those illustrated and described.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Fertilizers (AREA)

Abstract

An equipment (1; 40) for preparation of paper stock is disclosed comprising : a kneader (2) having a rotary cylinder (2a) with horizontal axis (X) adapted to treat waste paper in an aqueous environment to obtain the paper stock; a collection tank (3) of the paper stock coming out from the kneader (2); pumping means (4) to transfer the paper stock from the collection tank (3) to filtration means (5), said filtration means comprising a static filtration unit (6) arranged immediately downstream said pumping means (4).

Description

EQUIPMENT FOR PREPARATION OF PAPER STOCK
The presept invention relates to an equipment, particularly adapted to prepare paper stock obtained by kneading waste paper.
It is well known that in the paper industry some kinds , of paper, particularly those of lower grade, are made using paper pulps obtained recycling waste paper.
The preparation of such paper stock is carried out in proper plants substantially comprising kneaders which blend waste paper with water and make a fibrous stock which is then filtered to remove the contraries. As a matter of fact the stock coming out from the kneaders contains foreign matter of various kind and sizes that must be removed before the stock is used in the subsequent paper manufacturing phases.
A known embodiment of said plants has a plurality of kneaders with cylindrical tank provided with a helical impeller, each kneader being provided downstream with a rotary basket filter to remove the contraries from the fibrous stock.
The plants of such kind have the limitation that the operation of each couple consisting of kneader and filter is discontinuous because after a predetermined operation time, both the kneader and the filter must be stopped to allow discharge of the separated contraries. In an attempt to overcome such limitation, equipments are made having a single kneader essentially comprising a cylindrical container with horizontal axis inside provided with blades of various shapes carrying out kneading of waste paper when the cylinder is caused to rotate.
In the end part the kneader has a pre-filtering zone generally consisting of a foraminous surface retaining the bigger contraries that are thus separated before the fibrous stock comes out from the kneader.
The stock is then filtered again through a plurality of filters cascade arranged downstream the kneader, comprising a cyclone filter receiving the fibrous stock coming out from the kneader, followed by a plurality of rotary basket filters cascade arranged, each of them separating the polluting substances from the paper stock received from the preceding filter.
The number of filters arranged downstream the kneader is varying according to the kind of stock and contraries as well as the degree of filtration to be obtained. The just described plant has the advantage to allow a continuous treatment of the paper stock but has still some drawbacks.
A first drawback consists in that the pre-filt ation stage carried out in the kneader is too little selective and this involves an excessive working load on the filters arranged downstream that being too loaded do not succeed to carry out an adequate separation of the residual contraries.
Moreover as use of rotary basket filters notoriously causes fragmentation of the polluting elements, mainly the brittle ones such as polystyrene pieces and the like, if the quantity of contraries in the stock is rather high, the quantity of the fragmented polluting substances left in the stock after filtration is increased. This involves the drawback that a greater quantity of polluting substances goes into the subsequent treatments with a consequent reduction of quality of the final product.
The present invention aims at overcoming said drawbacks. More particularly a first object is to provide an equipment for preparation of paper stock improving the operation of the filters arranged downstream the kneader.
Another object of the invention is to provide an equipment reducing the fragmentation of the polluting substances during the filtration phase of the paper stock. A further object of the invention is to provide an equipment having a continuous cycle operation.
A last but not least object of the invention is to provide an equipment allowing to improve the quality of the paper stock in comparison with the quality that can be obtained with equivalent plants. The foregoing objects are attained by an equipment for preparation of paper stock that according to the main claim comprises:
- at least a kneader provided with a rotary cylinder with horizontal axis adapted to treat waste paper in an aqueous environment to obtain said paper stock; - at least a collection tank for said paper stock coming out from said at least a kneader;
- pumping means adapted to transfer said paper stock from said collection tank to filtration means, and is characterized in that said filtration means comprise at least a static filtration unit arranged immediately downstream said pumping means. According to a preferred embodiment the static filtration unit comprises a container inside provided with a fixed foraminous plate and scraping means slidingly cooperating with the filtering surface of the fixed foraminous plate. The foraminous plate is generally arranged orthogonal to the direction of advancement of paper stock inside the container, in which the plate defines a first chamber communicating with the pumping means and adapted to contain the paper stock to be filtered and a second chamber containing the filtered stock. The filtering surface of the foraminous plate is facing the first chamber in which the scraping means are also arranged.
The filtered stock contained in the second chamber is conveyed through second pumping means to other filters for further filtration while the polluting substances settled on the bottom of the first chamber are periodically discharged. Advantageously the equipment reducing crushing of the polluting substances contained in the waste paper, allows to obtain a paper stock of better quality relative to the stock that can be obtained with equivalent plants of the prior art. The foregoing objects and advantages will be better understood by reading the following description of preferred embodiments of the invention that are given as an illustrative but not limiting example with reference to the accompanying sheets of drawings in which:
- Fig. 1 shows a first embodiment of the equipment of the invention;
- Fig. 2 shows a constructional variation of the equipment of the invention;
- Fig. 3 is a longitudinal section of the static filtration unit of the equipment of figs. 1 and 2; and
- Fig. 4 is a front view of the filtering plate and the scraping means of the static filtration unit of fig. 3.
As shown in fig. 1 , the equipment of the invention generally indicated with reference 1 comprises a kneader generally indicated with 2, treating waste paper in an aqueous environment to obtain the paper stock; a collection tank generally indicated with 3 for the paper stock coming out from the kneader 2 and the pumping means generally indicated with 4, adapted to transfer the paper stock from the collection tank 3 to filtering means generally indicated with 5. The kneader 2 is a kneader of known type comprising a cylindrical container 2a rotating around a longitudinal axis X and provided with a loading inlet 2b to introduce φe waste paper to be treated in an aqueous environment, a pre-filter 2c adapted to carry out a filtration of the bigger contraries and arranged at the exit of the paper stock and a discharge outlet 2d arranged on the bottom of the container to remove the polluting substances separated by filtration.
According to the invention the filtering means 5 comprise at least a static filtration unit 6 arranged immediately downstream the first pumping means 4 for the paper stock to be filtered. More particularly said static filtration unit 6 that can be seen in the longitudinal section of fig. 3 and in the inner front view of fig. 4, comprises a vessel 7 in which a fixed foraminous plate 8 divides the internal room defining a first chamber 9 provided with a flange 10 connecting the pipe 11 feeding the paper stock to be filtered and a second chamber 12 receiving the stock filtered by the fixed foraminous plate 8 and provided with a flange 13 connecting the exit pipe 14 for the filtered paper stock.
The fixed foraminous plate 8 is arranged generally orthogonal to the direction V of flow of the paper stock in the vessel 7. On the bottom of the first chamber 9 there is a hopper 15 provided with a flange 16 connecting to the pipe 17 to discharge the contraries separated by filtration. A proper valve 18 to be seen in fig. 1 , allows to discharge the contraries separated by the static filtration unit 6 on the conveyor belt 19 carrying them to a collection storage 20.
In the fixed foraminous plate 8 one can see the filtering surface 8a facing the first chamber 9, slidingly cooperating with scraping means generally indicated with 21 consisting as shown in fig. 4, of an impeller 22 provided with three scraping blades 23a, 23b, 23c each being in contact with the filtering surface 8a and having a crescent-like profile making the scraping action particularly efficient. The peculiar feature of the static filtration unit 6 consists in that the impeller 22 which is being rotated by external driving means of known type indicated with M in fig. 1 to which it is connected through the axis 24, rotates at a very low speed.
Such a low rotation speed, together with the crescent-like profile of the blades reduces the likelihood of fragmentation of the substances polluting the paper stock to be filtered and therefore drastically decreases the quantity of contraries that can reach the filtered bath and therefore the final product. In this wgy the static filtering unit 6 carries out an intermediate filtration between the filtration effected by the pre-filter 2c of the kneader 2 and the fine filtration effected by the final filters generally indicated with 25 substantially consisting of a cyclone filter followed by rotary basket filters that are fed by the filtered paper stock coming out from the static filtration unit 6 through pumping means 26.
In order to optimize the equipment operation, it is important to keep constant the pressure inside the static filtering unit 6 and more particularly inside its vessel 7.
To this purpose pressure regulation and control means generally indicated with 27 are provided in the equipment.
According to the embodiment shown in fig. 1 , said pressure regulation and control means 27 comprise a first tank 28 connected through a pipe 28a to the pipe 11 feeding the static filtering unit 6; a second tank 29 connected through a pipe 29a to the inlet of the collection tank 3; and a third tank 30 connected to the delivery side of the pumping means 4 preferably consisting of a pump 4a. One can see that the third tank 30 is interposed between the first tank 28 and the second tank 29 and has a first overflow wall 31 separating from the first tank 28 and a second overflow wall 32 separating from the second tank 29. The second overflow wall 32 is arranged at a height H2 relative to the ground line S, greater than the height H1 of the first overflow wall 31. In this way it is possible to keep at the inlet of the static filtration unit 6 a generally constant hydrostatic pressure, in the range of values comprised between a quantity H1 and H2, each corresponding to the minimum and maximum static level, respectively, that the paper stock to be treated reaches inside the first tank 28 and the third tank 30 respectively.
A constructional variation of the equipment of the invention is shown in fig. 2 where one can see that said equipment generally indicated with 40, is different from the previously described equipment for a different embodiment of the pressure regulation and control means inside the static filtering unit 6, generally indicated with 41.
Said means comprise particularly a feeding valve 42 for the paper stock to be filtered, interposed between the pumping means 4 and the pipe 11 feeding the static filtration unit 6 as well as a safety valve 43 interposed between the pumping means 4 and the pipe 29a at the inlet of the collection tank 3.
An electriq electronic control and driving board generally indicated, with 44 is provided and comprises:
- a first driving unit 44a connected to the actuator 42a of the feeding valve 42;
- a second driving unit 44b connected to the actuator 43a of the safety valve 43;
- a sensing unit 44c connected to a pressure gauge 45 arranged inside the vessel 7 of the static filtration unit 6; and - a control and processing unit 44d connected to the driving units 44a, 44b and sensing unit 44c.
In view of the foregoing it can be seen that the equipment of the invention attains the intended objects in both embodiments hereinbefore described and illustrated. More particularly variations may be provided especially as to the design of filters arranged downstream the static filtration unit 6 or the pressure regulating means inside the filtration unit that may be different from those illustrated and described.
It is however to be understood that any modification that should be made to the equipment of the invention, when falling in the scope of the appended claims, is to be considered as covered by the present patent.

Claims

1) Arvequipment (1 ; 40) for preparation of .paper stock comprising:
- at least a kneader (2) having a rotary cylinder (2a) with horizontal axis (X) adapted to treat waste paper in an aqueous environment to obtain said paper stock;
- at least a collection tank (3) for said paper stock coming out from said at least a kneader (2);
- pumping means (4) adapted to transfer said paper stock from said collection tank (3) to filtration means (5), characterized in that said filtration means (5) comprise at least a static filtration unit (6) arranged immediately downstream said pumping means (4).
2) The equipment (1; 40) according to claim 1) characterized in that said at least a static filtration unit (6) comprises a vessel (7) internally provided with a fixed foraminous plate (8) for filtering said paper stock and scraping means (21) slidingly cooperating with the filtering surface (8a) of said fixed foraminous plate (8).
3) The equipment (1 ; 40) according to claim 2) characterized in that inside said vessel (7) of said static filtration unit (6), said foraminous plate (8) defines a first chamber (9) provided with a feeding pipe (11) for inlet of said paper stock to be filtered and a second chamber (12) adapted to receive the stock filtered through said fixed foraminous plate (8), the filtering surface (8a) of said fixed foraminous plate (8) and the corresponding scraping means (21) being arranged in said first chamber (9).
4) The equipment (1; 40) according to claim 2) or 3) characterized in that said fixed foraminous plate (8) is arranged generally orthogonal to the direction of advancement (V) of said paper stock inside said vessel (7).
5) The equipment (1 ; 40) according to claim 2) or 3) characterized in that said scraping means (21) consist of an impeller (22) provided with scraping blades (23a, 23b, 23c) and a shaft (24) coupling to driving means (M) adapted to rotate the impeller.
6) The equipment (1; 40) according to claim 5) characterized in that said scraping blades (23a, 23b, 23c) have a crescent-like profile.
7) The equipment (1 ; 40) according to claim 3) characterized in that said second chamber (12) communicates through an exit pipe (14) with pumping means (26) conveying said filtered stock to final filters (25). 8) The equipment (1 ; 40) according to claim 2) characterized in that between said pumping means (4) and said static filtration unit (6). regulation and control means (27; 41) of the feeding pressure of said static filtration unit (6) are provided. 9) The equipment (1 ; 40) according to claim 8) characterized in that said pressure regulation and control means (27) comprise:
- a first tank (28) connected to a pipe (11) feeding said stock to be filtered to said static filtration unit (6);
- a second tank (29) connected to a pipe (29a) feeding said collection tank (3);
- a third tank (30) connected to the delivery side of said pumping means (4), said third tank (30) being interposed between said first tank (28) and said second tank (29) and provided with a first overflow wall (31) separating from said first tank (28) and a second overflow wall (32) separating from said second tank (29).
10) The equipment (40) according to claim 8) characterized in that said pressure regulation and control means (41) comprise:
- a feeding valve (42) interposed between the delivery side of said pumping means (4) and a feeding pipe (11) for said static filtration unit (6); - a safety valve (43) interposed between the delivery side of said pumping means (4) and a feeding pipe (29) of said collection tank (3); and
- an electric/electronic regulation board (44) electrically connected to said valves (42, 43) and to said static filtration unit (6).
11) The equipment (40) according to claim 10) characterized in that said electric/electronic board (44) comprises:
- at least a first driving unit (44a) electrically connected to the actuator (42a) of said feeding vale (42);
- at least a second driving unit (44b) electrically connected to the actuator (43a) of said safety valve (43); - at least a sensing unit (44c) electrically connected to a pressure gauge (45) arranged inside said static filtration unit (6); and
- at least a control and processing unit (44d) electrically connected to said driving units (44a, 44b) and sensing unit (44c).
The equipment (1 ; 40) according to claim 2) characterized by comprising a collection and transportation unit (19) for the polluting substances separated by said static filtration unit (6).
PCT/EP2002/009106 2001-08-24 2002-08-14 Equipment for preparation of paper stock WO2003018906A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002331243A AU2002331243A1 (en) 2001-08-24 2002-08-14 Equipment for preparation of paper stock

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITVI2001A000178 2001-08-24
IT2001VI000178A ITVI20010178A1 (en) 2001-08-24 2001-08-24 PLANT FOR THE PREPARATION OF PAPER MIXTURES

Publications (2)

Publication Number Publication Date
WO2003018906A2 true WO2003018906A2 (en) 2003-03-06
WO2003018906A3 WO2003018906A3 (en) 2003-04-17

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PCT/EP2002/009106 WO2003018906A2 (en) 2001-08-24 2002-08-14 Equipment for preparation of paper stock

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AU (1) AU2002331243A1 (en)
IT (1) ITVI20010178A1 (en)
WO (1) WO2003018906A2 (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2721882B1 (en) * 1977-04-27 1978-05-24 Escher Wyss Gmbh Plant for processing waste paper
US4604193A (en) * 1983-03-25 1986-08-05 E Et M Lamort S.A. Method and apparatus for sorting out a mixture of paper pulp and contaminants
GB2286206A (en) * 1994-01-21 1995-08-09 Badcall Ltd A paper manufacturing process
EP0732442A2 (en) * 1995-03-17 1996-09-18 Voith Sulzer Stoffaufbereitung GmbH Process for treating waste paper and apparatus for its application
EP0887458A1 (en) * 1997-06-26 1998-12-30 Voith Sulzer Papiertechnik Patent GmbH Process to suspend and clean a paper stock containing contaminants
EP1116816A1 (en) * 2000-01-05 2001-07-18 Voith Paper Patent GmbH Method for pulping wastepaper
EP1215334A1 (en) * 2000-12-16 2002-06-19 Voith Paper Patent GmbH Process for pulping and cleaning of fibrous material containing impurities in particular waste paper

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2721882B1 (en) * 1977-04-27 1978-05-24 Escher Wyss Gmbh Plant for processing waste paper
US4604193A (en) * 1983-03-25 1986-08-05 E Et M Lamort S.A. Method and apparatus for sorting out a mixture of paper pulp and contaminants
GB2286206A (en) * 1994-01-21 1995-08-09 Badcall Ltd A paper manufacturing process
EP0732442A2 (en) * 1995-03-17 1996-09-18 Voith Sulzer Stoffaufbereitung GmbH Process for treating waste paper and apparatus for its application
EP0887458A1 (en) * 1997-06-26 1998-12-30 Voith Sulzer Papiertechnik Patent GmbH Process to suspend and clean a paper stock containing contaminants
EP1116816A1 (en) * 2000-01-05 2001-07-18 Voith Paper Patent GmbH Method for pulping wastepaper
EP1215334A1 (en) * 2000-12-16 2002-06-19 Voith Paper Patent GmbH Process for pulping and cleaning of fibrous material containing impurities in particular waste paper

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Publication number Publication date
WO2003018906A3 (en) 2003-04-17
ITVI20010178A1 (en) 2003-02-24
AU2002331243A1 (en) 2003-03-10

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