CA2332679A1 - Screen - Google Patents
Screen Download PDFInfo
- Publication number
- CA2332679A1 CA2332679A1 CA002332679A CA2332679A CA2332679A1 CA 2332679 A1 CA2332679 A1 CA 2332679A1 CA 002332679 A CA002332679 A CA 002332679A CA 2332679 A CA2332679 A CA 2332679A CA 2332679 A1 CA2332679 A1 CA 2332679A1
- Authority
- CA
- Canada
- Prior art keywords
- rotor
- infeed
- screen
- installation
- cone
- 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.)
- Abandoned
Links
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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
- Combined Means For Separation Of Solids (AREA)
- Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
- Centrifugal Separators (AREA)
Abstract
The invention relates to a screen 1 for cleaning a pulp suspension. It is mainly characterized by an additional screen basket 11 being provided in the infeed area for pre-screening.
Description
The invention relates to a screen for cleaning pulp suspensions.
Screens are machines used in the paper industry for the purpose of cleaning a pulp suspension consisting of water, fibres and dirt particles. In doing so, a feed flow is led over a screening device, with the accept stream consisting of water and fibres flowing through the screen. A partial stream, called the reject stream, consisting of water, fibres and dirt particles, is generally withdrawn from the end located opposite the feed flow. So with a screen a separation of particles which are suspended in a liquid takes place. To the contrary with filtration the liquid is separated from the solids. Generally speaking, such a screen is designed rotationally symmetrically and consists of a casing with a tangentially arranged infeed, a cylindrical screen basket, mostly with holes or vertical slots, and a revolving rotor. The rotor has the task of keeping the screen slots clear, and this is achieved by blades which rotate closely to the screen surface. The accept stream is collected in a so-called accept chamber, often one of a conical design, and extracted radially at some point. The reject stream is generally led to the screen basket side located opposite the feed, into a reject chamber, which is in most cases annular, and extracted from the chamber tangentially.
Such a screen is known for instance from US 4,268,381. The disadvantage of these screening machines consists in the risk of clogging at low flow rates occurring in the relatively large reject chamber. Also, non-uniform onflow to the screen basket and non-uniform flow conditions in the accept chamber, especially in the area of the accept discharge, occur.
The purpose of the invention is, therefore, to create an improvement of the flow conditions in the screen in order to decrease the energy used at increased production rate and dirt removal.
The invention is therefore characterized by an additional screen basket being provided in the infeed area for pre-screening. This allows to achieve better discharge in machine.
An advantageous advancement of the invention is characterized by the additional screen basket turning together with the rotor, with the additional screen basket possibly also being fixed.
A favourable variant of the invention is characterized by rotating blades being provided in the pre-screening area, whereby the blades can be arranged in the feed flow or in the accept flow.
A favourable advancement of the invention is characterized by a stationary installation, which may be designed rotationally symmetrically, being provided in the infeed area between the tube branch and the end of the rotor. This gives a substantial improvement of the flow conditions and as a consequence, a reduction of the amount of energy used.
1 S An advantageous advancement of the invention is characterized by the installation being a cone, a truncated cone, a hemisphere, a spherical segment, a spherical segment between two parallel circles, a paraboloid, or a hyperboloid of two sheets.
A favourable variant of the invention is characterized by the cone angle a amounting to between 10° and 60° for installations designed as a cone or truncated cone, with the axis of the infeed branch possibly being arranged in parallel to the cone shell.
A favourable, alternative variant of the invention is ~characterized by the installation being a spiral-shaped body, with the pitch of the spiral being selectable such that the. flow speed in the infeed area is kept constant over the entire screen basket width.
An advantageous advancement of the invention is characterized by the installation being arranged concentrically.
An advantageous variant of the invention is characterized by the accept chamber being designed double-conically.
An advantageous advancement of the invention is characterized by the screen being designed as double machine.
A favourable advancement of the invention is characterized by the infeed taking place axially through the rotor.
A favourable variant of the invention is characterized by the drive-side rotor part being of the same height as or higher than the rotor part on the other side of the drive into which and through which the pulp flows.
A favourable variant of the invention is characterized by the infeed taking place centrally from the side.
An advantageous advancement of the invention is characterized by two accept discharges being provided.
An advantageous variant of the invention is characterized by the screen being arranged horizontally.
A favourable advancement of the invention is characterized by a screen basket for pre-screening, which turns together with the rotor, being provided in the infeed area, with rotating blades possibly being provided in the pre-screening area.
A favourable advancement of the invention is characterized by the rotor having several blades arranged at different heights and/or distributed over the circumference.
The invention is described below in examples and with reference to the drawings, where Fig. 1 shows a variant of the invention with a section for integrated pre-screening, Fig. 2 a further variant of the invention, Fig. 3 an alternative variant of the invention, Fig. 4 a design as a double machine, Fig. 5 a diagram showing the specific energy versus the screen plate flow and Fig. 6 a diagram of dots reduction versus the screen plates flow.
Fig. 1 now shows the upper part of screen 1 arranged vertically with an integrated pre-screening. The pulp suspension is fed to the screen 1 via infeed branch 2. In order to discharge heavy particles in the area of the pre-screening, a pre-screening area 10 is provided in the upper part of screen 1, into which the suspension passes through a screen plate 11. The flow of the pulp suspension therefore is from the outside to the inside. This allows efficient removal of specifically heavy particles and large-surface contaminants, which result from dirty or very dirty pulps. There is a locked-in rotor 12 outside screen plate 11, i.e. on the feed side, this rotor being connected to rotor 4 via an extension 13.
In an alternative variant, the rotor may also be running inside the screen plate.
The heavy particles leave the pre-screening area through branch 14. Rotor 12 may be running in the pre-screening area 10 both in the infeed flow (as shown) or in the accept flow, which is then led to further fine screening in the lower area of the screen 1. If the rotor 12 runs in the infeed flow, then the rotating cleaner blades of the rotor 12 keep the highly abrasive heavy particles from hitting and thereby damaging that surface of screen plate 11.
The specifically heavy parts are thereby centrifuged outside. This allows to achieve longer useful life for the screen baskets in the pre-screening area, and on the other hand also to have a planned barrier in the form of the pre-screening basket as a consistent impediment for the heavy parts to pass into the centrifugal post-screening area. This means that the rotors, for the fact that they rotate in the first-stage accepts, are being loaded longer at the onflow edges and are therefore subject to lesser abrasion and energy consumption and can therefore be adjusted more closely to the surface of screen plate 5, without triggering damage to the rotor or screen plate surface. The separation of coarse and minor contaminants results in increased performance (throughput and effectiveness increase) in comparison to conventional screening machines.
This variant can also be designed with a double-cone rotor for high production rates. The prescribed construction further makes possible a better and easier sealing and a better access for cleaning.
Fig. 2 shows a screen 1, to which a pulp suspension is fed for cleaning, through an infeed branch 2. In the area of the infeed, an installation 3 is provided, which is shown as a truncated cone here. The "top" of the truncated cone points in the direction of the rotor 4. The flank angle a of the truncated cone amounts to between 10° and 60° in view of optimum deflection. The pulp suspension enters at the area between rotor 4 and screen plate 5 and is fed to the accept chamber 6 through the screen plate. The casing of the accept chamber is designed as a double cone, i.e. the casing tapers conically from about the upper edge of the accept outlet 7 toward the reject chamber, with the angle of the accept chamber being designed in view of a constant flow speed at an assumed uniform discharge through the screen plate.
For this, the rotor 4 of the screen 1 is designed for uniform screen onflow, which necessitates lower thickening behaviour along the screen plate height. It is shaped as a parabola, and this means that the axial flow rate inside the screen basket remains constant at an assumed uniform outflow through the screen plate. As an alternative, the shape of the rotor may be approached through a conical shape.
To ensure suitable discharge of the reject flow, the reject chamber is designed such that flow rates above 2.5 m/sec. with or without additional introduction of agitating energy by the rotor are achieved. This virtually avoids clogging.
Fig. 3 shows an analogous arrangement of a screen 1, with the infeed branch 2 being arranged such that the suspension is fed parallel to the shell 3 of the truncated cone 3. This means that the energy loss which normally exists in case of flow diversion can be avoided.
Fig. 4 shows the design as a top machine as it is used for high production rates.
For this, the rotor is, for instance, designed as a double parabolic rotor 4, 4' or double-cone rotor. The reject discharge 8, 8' and the screen basket 5, 5' are also provided twice. Here, too, the accept chamber 6, 6' comes as a double cone, and this means in this case as well that the casing tapers approximately from the upper edge of the accept flow discharge 7 toward the reject chamber.
The pulp suspension is also fed via infeed branch 2 and, in the configuration shown, routed axially through the rotor. With this type of onflow, the height of drive-side rotor part 4 is equal or larger than height L2 of rotor part 4' into which and through which the flow takes place, and which is opposite the drive side. The suspension leaves the rotor part 4', through which the flow takes place, through openings 9 at the centre and is distributed in both directions.
It passes through the screen basket 5, 5' into accept chamber 6, 6', the same as for a single screen, this accept chamber being in this case also designed as a double cone. The reject flows both upwards and downwards and is in this case discharged from the machine via a reject chamber 8, 8'. In another configuration, the infeed may take place centrally from the side. There may be two accept discharges, one on top (7') and bottom (7) or a single one in the centre. The screening device may be designed horizontally.
Fig. 5 shows the diagram of the energy requirement over the screen plate through-flow, with one curve being shown for existing screens and one for screens according to the invention, with conical installation in the infeed area.
Fig. 6 shows the dot reduction over the screen plate through-flow. It can be seen here that with a conical installation in the infeed area, it was also possible to improve the dot reduction substantially and to reduce the specific energy consumption at the same time.
Screens are machines used in the paper industry for the purpose of cleaning a pulp suspension consisting of water, fibres and dirt particles. In doing so, a feed flow is led over a screening device, with the accept stream consisting of water and fibres flowing through the screen. A partial stream, called the reject stream, consisting of water, fibres and dirt particles, is generally withdrawn from the end located opposite the feed flow. So with a screen a separation of particles which are suspended in a liquid takes place. To the contrary with filtration the liquid is separated from the solids. Generally speaking, such a screen is designed rotationally symmetrically and consists of a casing with a tangentially arranged infeed, a cylindrical screen basket, mostly with holes or vertical slots, and a revolving rotor. The rotor has the task of keeping the screen slots clear, and this is achieved by blades which rotate closely to the screen surface. The accept stream is collected in a so-called accept chamber, often one of a conical design, and extracted radially at some point. The reject stream is generally led to the screen basket side located opposite the feed, into a reject chamber, which is in most cases annular, and extracted from the chamber tangentially.
Such a screen is known for instance from US 4,268,381. The disadvantage of these screening machines consists in the risk of clogging at low flow rates occurring in the relatively large reject chamber. Also, non-uniform onflow to the screen basket and non-uniform flow conditions in the accept chamber, especially in the area of the accept discharge, occur.
The purpose of the invention is, therefore, to create an improvement of the flow conditions in the screen in order to decrease the energy used at increased production rate and dirt removal.
The invention is therefore characterized by an additional screen basket being provided in the infeed area for pre-screening. This allows to achieve better discharge in machine.
An advantageous advancement of the invention is characterized by the additional screen basket turning together with the rotor, with the additional screen basket possibly also being fixed.
A favourable variant of the invention is characterized by rotating blades being provided in the pre-screening area, whereby the blades can be arranged in the feed flow or in the accept flow.
A favourable advancement of the invention is characterized by a stationary installation, which may be designed rotationally symmetrically, being provided in the infeed area between the tube branch and the end of the rotor. This gives a substantial improvement of the flow conditions and as a consequence, a reduction of the amount of energy used.
1 S An advantageous advancement of the invention is characterized by the installation being a cone, a truncated cone, a hemisphere, a spherical segment, a spherical segment between two parallel circles, a paraboloid, or a hyperboloid of two sheets.
A favourable variant of the invention is characterized by the cone angle a amounting to between 10° and 60° for installations designed as a cone or truncated cone, with the axis of the infeed branch possibly being arranged in parallel to the cone shell.
A favourable, alternative variant of the invention is ~characterized by the installation being a spiral-shaped body, with the pitch of the spiral being selectable such that the. flow speed in the infeed area is kept constant over the entire screen basket width.
An advantageous advancement of the invention is characterized by the installation being arranged concentrically.
An advantageous variant of the invention is characterized by the accept chamber being designed double-conically.
An advantageous advancement of the invention is characterized by the screen being designed as double machine.
A favourable advancement of the invention is characterized by the infeed taking place axially through the rotor.
A favourable variant of the invention is characterized by the drive-side rotor part being of the same height as or higher than the rotor part on the other side of the drive into which and through which the pulp flows.
A favourable variant of the invention is characterized by the infeed taking place centrally from the side.
An advantageous advancement of the invention is characterized by two accept discharges being provided.
An advantageous variant of the invention is characterized by the screen being arranged horizontally.
A favourable advancement of the invention is characterized by a screen basket for pre-screening, which turns together with the rotor, being provided in the infeed area, with rotating blades possibly being provided in the pre-screening area.
A favourable advancement of the invention is characterized by the rotor having several blades arranged at different heights and/or distributed over the circumference.
The invention is described below in examples and with reference to the drawings, where Fig. 1 shows a variant of the invention with a section for integrated pre-screening, Fig. 2 a further variant of the invention, Fig. 3 an alternative variant of the invention, Fig. 4 a design as a double machine, Fig. 5 a diagram showing the specific energy versus the screen plate flow and Fig. 6 a diagram of dots reduction versus the screen plates flow.
Fig. 1 now shows the upper part of screen 1 arranged vertically with an integrated pre-screening. The pulp suspension is fed to the screen 1 via infeed branch 2. In order to discharge heavy particles in the area of the pre-screening, a pre-screening area 10 is provided in the upper part of screen 1, into which the suspension passes through a screen plate 11. The flow of the pulp suspension therefore is from the outside to the inside. This allows efficient removal of specifically heavy particles and large-surface contaminants, which result from dirty or very dirty pulps. There is a locked-in rotor 12 outside screen plate 11, i.e. on the feed side, this rotor being connected to rotor 4 via an extension 13.
In an alternative variant, the rotor may also be running inside the screen plate.
The heavy particles leave the pre-screening area through branch 14. Rotor 12 may be running in the pre-screening area 10 both in the infeed flow (as shown) or in the accept flow, which is then led to further fine screening in the lower area of the screen 1. If the rotor 12 runs in the infeed flow, then the rotating cleaner blades of the rotor 12 keep the highly abrasive heavy particles from hitting and thereby damaging that surface of screen plate 11.
The specifically heavy parts are thereby centrifuged outside. This allows to achieve longer useful life for the screen baskets in the pre-screening area, and on the other hand also to have a planned barrier in the form of the pre-screening basket as a consistent impediment for the heavy parts to pass into the centrifugal post-screening area. This means that the rotors, for the fact that they rotate in the first-stage accepts, are being loaded longer at the onflow edges and are therefore subject to lesser abrasion and energy consumption and can therefore be adjusted more closely to the surface of screen plate 5, without triggering damage to the rotor or screen plate surface. The separation of coarse and minor contaminants results in increased performance (throughput and effectiveness increase) in comparison to conventional screening machines.
This variant can also be designed with a double-cone rotor for high production rates. The prescribed construction further makes possible a better and easier sealing and a better access for cleaning.
Fig. 2 shows a screen 1, to which a pulp suspension is fed for cleaning, through an infeed branch 2. In the area of the infeed, an installation 3 is provided, which is shown as a truncated cone here. The "top" of the truncated cone points in the direction of the rotor 4. The flank angle a of the truncated cone amounts to between 10° and 60° in view of optimum deflection. The pulp suspension enters at the area between rotor 4 and screen plate 5 and is fed to the accept chamber 6 through the screen plate. The casing of the accept chamber is designed as a double cone, i.e. the casing tapers conically from about the upper edge of the accept outlet 7 toward the reject chamber, with the angle of the accept chamber being designed in view of a constant flow speed at an assumed uniform discharge through the screen plate.
For this, the rotor 4 of the screen 1 is designed for uniform screen onflow, which necessitates lower thickening behaviour along the screen plate height. It is shaped as a parabola, and this means that the axial flow rate inside the screen basket remains constant at an assumed uniform outflow through the screen plate. As an alternative, the shape of the rotor may be approached through a conical shape.
To ensure suitable discharge of the reject flow, the reject chamber is designed such that flow rates above 2.5 m/sec. with or without additional introduction of agitating energy by the rotor are achieved. This virtually avoids clogging.
Fig. 3 shows an analogous arrangement of a screen 1, with the infeed branch 2 being arranged such that the suspension is fed parallel to the shell 3 of the truncated cone 3. This means that the energy loss which normally exists in case of flow diversion can be avoided.
Fig. 4 shows the design as a top machine as it is used for high production rates.
For this, the rotor is, for instance, designed as a double parabolic rotor 4, 4' or double-cone rotor. The reject discharge 8, 8' and the screen basket 5, 5' are also provided twice. Here, too, the accept chamber 6, 6' comes as a double cone, and this means in this case as well that the casing tapers approximately from the upper edge of the accept flow discharge 7 toward the reject chamber.
The pulp suspension is also fed via infeed branch 2 and, in the configuration shown, routed axially through the rotor. With this type of onflow, the height of drive-side rotor part 4 is equal or larger than height L2 of rotor part 4' into which and through which the flow takes place, and which is opposite the drive side. The suspension leaves the rotor part 4', through which the flow takes place, through openings 9 at the centre and is distributed in both directions.
It passes through the screen basket 5, 5' into accept chamber 6, 6', the same as for a single screen, this accept chamber being in this case also designed as a double cone. The reject flows both upwards and downwards and is in this case discharged from the machine via a reject chamber 8, 8'. In another configuration, the infeed may take place centrally from the side. There may be two accept discharges, one on top (7') and bottom (7) or a single one in the centre. The screening device may be designed horizontally.
Fig. 5 shows the diagram of the energy requirement over the screen plate through-flow, with one curve being shown for existing screens and one for screens according to the invention, with conical installation in the infeed area.
Fig. 6 shows the dot reduction over the screen plate through-flow. It can be seen here that with a conical installation in the infeed area, it was also possible to improve the dot reduction substantially and to reduce the specific energy consumption at the same time.
Claims (22)
1. Screen for cleaning a pulp suspension, characterized by an additional screen basket (11) being provided in the infeed area for pre-screening.
2. Device according to Claim 1, characterized by the additional screen basket (11) turning together with the rotor (12).
3. Device according to Claim 1, characterized by the additional screen basket (11) being fixed.
4. Device according to one of the Claims 1 to 3, characterized by rotating blades being provided in the pre-screening area (10).
5. Device according to Claim 4, characterized by the blades being arranged in the infeed flow.
6. Device according to Claim 4, characterized by the blades being arranged in the accept flow.
7. Device according to one of the Claims 1 to 6, characterized by a stationary installation (3) being provided in the infeed area between the tube branch (2) and the free end of the rotor (4).
8. Device according to Claim 7, characterized by the installation (3) being designed rotationally symmetrically.
9. Device according to Claim 8, characterized by the installation (3) being a cone, a truncated cone, a hemisphere, a spherical segment, a spherical segment between two parallel circles, a paraboloid, or a hyperboloid of two sheets.
10. Device according to Claim 8, with an installation (3) as cone or truncated cone, characterized by the cone angle a amounting to between 10° and 60°.
11. Device according to Claim 10, characterized by the axis of the infeed branch (2) being arranged in parallel to the cone shell.
12. Device according to Claim 7, characterized by the installation (3) being a spiral-shaped body.
13. Device according to Claim 11, characterized by the pitch of the spiral being selected such that the flow speed in the infeed area is kept constant over the entire screen basket width.
14. Device according to one of the Claims 7 to 13, characterized by the installation (3) being arranged concentrically.
15. Device according to one of the Claims 1 to 13, characterized by the accept chamber (6) being designed double-conically.
16. Device according to one of the Claims 1 to 15, characterized by the screen (1) being designed as double machine.
17. Device according to Claim 16, characterized by the infeed taking place axially through the rotor (4).
18. Device according to Claim 17, characterized by the drive-side rotor part (4) being of the same height as or higher than the rotor part (4') on the other side of the drive into which and through which the pulp flows.
19. Device according to Claim 18, characterized by the infeed taking place centrally from the side.
20. Device according to one of the Claims 16 to 19, characterized by two accept discharges (7, 7') being provided.
21. Device according to one of the Claims 1 to 20, characterized by the screen (1) being arranged horizontally.
22. Device according to one of the Claims 1 to 21, characterized by the rotor (4, 4') having several blades arranged at different heights and/or distributed over the circumference.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ATA166/2000 | 2000-02-03 | ||
| AT0016600A AT408771B (en) | 2000-02-03 | 2000-02-03 | SORTER FOR CLEANING A FIBER SUSPENSION |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2332679A1 true CA2332679A1 (en) | 2001-08-03 |
Family
ID=3653490
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002332679A Abandoned CA2332679A1 (en) | 2000-02-03 | 2001-01-30 | Screen |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP1122358B2 (en) |
| CN (1) | CN1180160C (en) |
| AT (2) | AT408771B (en) |
| BR (1) | BR0100352A (en) |
| CA (1) | CA2332679A1 (en) |
| DE (1) | DE50106745D1 (en) |
| ES (1) | ES2246260T5 (en) |
| MX (1) | MXPA01001293A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113648693A (en) * | 2021-07-14 | 2021-11-16 | 安徽金星钛白（集团）有限公司 | Primary filter for preventing blockage during blanking of metatitanic acid storage tank |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10115298A1 (en) * | 2001-03-28 | 2002-10-17 | Voith Paper Patent Gmbh | Pressure sorter for removing contaminants from a paper fiber suspension containing contaminants |
| AT413390B (en) | 2003-03-27 | 2006-02-15 | Andritz Ag Maschf | SORTER FOR CLEANING A FIBER SUSPENSION |
| AT413110B (en) * | 2003-10-15 | 2005-11-15 | Andritz Ag Maschf | SORTER |
| CN110787517B (en) * | 2019-11-28 | 2020-10-30 | 广东吉康环境系统科技有限公司 | Sludge drying pretreatment device |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3053391A (en) * | 1959-08-17 | 1962-09-11 | Bird Machine Co | Apparatus for screening |
| US4302327A (en) * | 1980-03-17 | 1981-11-24 | The Black Clawson Company | Center flow screening apparatus |
| DE3703831A1 (en) * | 1987-02-07 | 1988-09-08 | Voith Gmbh J M | PLASTIC SORTER |
| SE464640B (en) * | 1988-06-16 | 1991-05-27 | Kamyr Ab | DEVICE FOR SILENCE OF A SUSPENSION OF A FIBER CELLULOSAMASSA |
| FI902968A (en) * | 1990-06-13 | 1991-12-14 | Sunds Defibrator Jylha Oy | SIKTENHET FOER SORTERING AV MASSOR, SAERSKILT PAPPERSMASSA. |
| DE4135854A1 (en) * | 1991-10-31 | 1993-05-06 | J.M. Voith Gmbh, 7920 Heidenheim, De | SORTER |
| FI93979C (en) * | 1993-08-20 | 1995-06-26 | Tampella Oy Valmet | Method and pressure sorter for sorting pulp |
| US5575395A (en) * | 1994-07-15 | 1996-11-19 | A. Ahlstrom Corporation | Method and apparatus for screening fibrous suspensions |
| US5884774A (en) * | 1996-03-11 | 1999-03-23 | Aikawa Iron Works Co., Ltd. | Papermaking screen |
| SE507481C2 (en) * | 1996-05-02 | 1998-06-15 | Alfa Laval Ab | Device for separating impurities from fiber pulp suspensions |
| SE511786C2 (en) * | 1998-03-06 | 1999-11-22 | Sunds Defibrator Ind Ab | Screening device with two screening chambers for separating fiber suspensions |
-
2000
- 2000-02-03 AT AT0016600A patent/AT408771B/en not_active IP Right Cessation
-
2001
- 2001-01-25 EP EP01101559A patent/EP1122358B2/en not_active Expired - Lifetime
- 2001-01-25 AT AT01101559T patent/ATE299965T1/en not_active IP Right Cessation
- 2001-01-25 DE DE50106745T patent/DE50106745D1/en not_active Expired - Lifetime
- 2001-01-25 ES ES01101559T patent/ES2246260T5/en not_active Expired - Lifetime
- 2001-01-30 CA CA002332679A patent/CA2332679A1/en not_active Abandoned
- 2001-02-02 CN CNB011119365A patent/CN1180160C/en not_active Expired - Lifetime
- 2001-02-02 MX MXPA01001293A patent/MXPA01001293A/en active IP Right Grant
- 2001-02-05 BR BR0100352-6A patent/BR0100352A/en not_active Application Discontinuation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113648693A (en) * | 2021-07-14 | 2021-11-16 | 安徽金星钛白（集团）有限公司 | Primary filter for preventing blockage during blanking of metatitanic acid storage tank |
| CN113648693B (en) * | 2021-07-14 | 2022-12-27 | 安徽金星钛白（集团）有限公司 | Primary filter for preventing blockage during blanking of metatitanic acid storage tank |
Also Published As
| Publication number | Publication date |
|---|---|
| AT408771B (en) | 2002-03-25 |
| DE50106745D1 (en) | 2005-08-25 |
| ES2246260T3 (en) | 2006-02-16 |
| MXPA01001293A (en) | 2005-08-16 |
| EP1122358A2 (en) | 2001-08-08 |
| EP1122358B2 (en) | 2008-01-02 |
| EP1122358A3 (en) | 2001-11-21 |
| CN1180160C (en) | 2004-12-15 |
| BR0100352A (en) | 2001-10-02 |
| ES2246260T5 (en) | 2008-05-01 |
| CN1320741A (en) | 2001-11-07 |
| EP1122358B1 (en) | 2005-07-20 |
| ATA1662000A (en) | 2001-07-15 |
| ATE299965T1 (en) | 2005-08-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |