WO2003069056A1 - Screening belt for drainage machines - Google Patents
Screening belt for drainage machines Download PDFInfo
- Publication number
- WO2003069056A1 WO2003069056A1 PCT/AT2003/000038 AT0300038W WO03069056A1 WO 2003069056 A1 WO2003069056 A1 WO 2003069056A1 AT 0300038 W AT0300038 W AT 0300038W WO 03069056 A1 WO03069056 A1 WO 03069056A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- threads
- transverse
- cross
- sieve belt
- belt according
- Prior art date
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/0027—Screen-cloths
- D21F1/0036—Multi-layer screen-cloths
Definitions
- the invention relates to a screen belt for drainage machines, consisting of a base fabric with weft and warp threads.
- Sieve belts of this type as z. B. in EP 0 864 775 AI of the applicant are used in drainage technology, especially for pulp dewatering machines or in general for sludge dewatering. Although water is dewatered in most cases, the term “dewatering” should not be interpreted restrictively, since other liquids can also be the subject of "dewatering”.
- a belt runs as a pair, the parts of which are referred to as upper and lower sieve / felt.
- a cellulose web is transported between the two belts and loaded by one or more pairs of rollers, in the nip of which the water contained in the cellulose web is to be squeezed out.
- Good dewatering cannot be achieved simply by increasing the roller contact pressure, since too high a pressure has a negative effect on the structure of the cellulose web.
- a rewetting effect occurs in that after leaving the nip, the compressed cellulose web partially opens again - comparable to a sponge - and thereby sucks up water from the sieve again.
- An object of the invention is to provide a sieve belt with which effective dewatering while reducing the rewetting effect is possible.
- the sieve belt according to the invention shows a significantly improved dewatering effect compared to conventional sieve belts, which is attributed to the fact that the voluminous, absorbent and compressible cross twists are pressed out in the roller nip and expand again when leaving the nip and now in turn suck water from the cellulose web, so that the latter is additionally drained.
- the fact that the absorbent threads run across has also proven to be important. Experiments with longitudinal absorbent threads have shown that they are far less dehydrated. show effect and, moreover, in this case a non-bulky plug-in seam (e.g. EP 0 864779) cannot be realized.
- cross threads are mixed threads consisting of a material mixture and z. B. consist of a mixture of monofilaments, filaments and staple fiber yarns.
- the transverse threads have an elliptical cross-section, the small axis of which is perpendicular to the plane of the tape.
- the transverse threads can remain adapted to the relatively small thickness of the sieve belt, for example 3 mm, despite the small volume.
- the transverse and longitudinal threads of the base fabric advantageously have a round cross-section, the diameter of the transverse and longitudinal threads being between 0.5 and 1.5 mm.
- the cross and longitudinal threads are expediently made of polyamide, polyester or polypropylene.
- the cross threads can advantageously be provided in every second weft of the base fabric.
- Fig. 1 is a perspective view of a section of a sieve belt according to the invention in approximately 4 times magnification
- FIG. 2 shows a side view of a section of the sieve belt according to FIG. 1 in approximately 17 times magnification.
- the starting point of the sieve belt according to the invention is a basic fabric with longitudinal threads 1 and transverse threads 2, as can be seen from FIGS. 1 and 2, wherein the threads 1, 2 can be monofilaments.
- Fig. 1 shows a section of a screen belt according to the invention, which can be used in dewatering machines and moves in the direction of arrow L.
- an upper, endless and a lower, endless screen belt circulate in a dewatering machine, a layer of the mass (sludge) to be dewatered being located between the lower run of the upper and the upper run of the lower screen belt.
- This structure consisting of three layers, namely upper sieve belt - sludge - lower sieve belt, runs on the dewatering machine with the running direction L shown in FIG. 1 through the gap of one or more pairs of rollers.
- the sieve belt consists of a basic fabric, which like every fabric has weft and warp threads.
- longitudinal threads 1 are provided which extend essentially in the running direction L of the belt and which correspond to the warp threads of the base fabric, which is woven flat by the meter.
- Cross threads 2, 2o, 2u of the screen belt lie normal to the running direction L and correspond to the weft threads of the base fabric. 1 and 2, one weft thread 2 or two weft threads 2o, 2u lying one above the other are alternately provided in the exemplary embodiment shown.
- the transverse and longitudinal threads 2, 2o, 2u and 1 of the screen belt are monofilaments with a diameter of, for example, 0.5 or 1.5 mm, and, in practical embodiments, they consist of polyamide, polyester or polypropylene.
- an additional cross thread 3 is accommodated in every second weft of the base fabric.
- the Querzwixne suitably consist of material mixtures, such as of monofilaments, filaments and staple fiber yarns, using conventional synthetic materials such as e.g. Polyamide, polyester or polypropylene are preferred.
- the transverse threads can have a cross section that is elliptical in the broadest sense.
- the absorbent cross threads run parallel to the roller axes of pairs of rollers, they can be squeezed out very well in the roller nip, whereby the drainage capacity and flexibility are much better than with longitudinal absorbent threads.
- the transverse threads 3 can also be arranged more densely.
- cross threads could also be provided.
- the transverse threads could also lie in larger longitudinal sections from one another than in the embodiment according to FIG. 1, in which the transverse screens are at intervals of approximately 5 to 6 mm.
- the cross-section of the transverse threads is not necessarily elliptical
- the cross-section of the longitudinal threads 1 and the transverse threads 2, 2o, 2u can also be "flattened” instead of circular, e.g. rectangular, elliptical, etc.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2003208156A AU2003208156A1 (en) | 2002-02-12 | 2003-02-10 | Screening belt for drainage machines |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ATA212/2002 | 2002-02-12 | ||
AT2122002A AT410807B (en) | 2002-02-12 | 2002-02-12 | SCREENING BELT FOR DRAINAGE MACHINES |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003069056A1 true WO2003069056A1 (en) | 2003-08-21 |
Family
ID=3669707
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/AT2003/000038 WO2003069056A1 (en) | 2002-02-12 | 2003-02-10 | Screening belt for drainage machines |
Country Status (3)
Country | Link |
---|---|
AT (1) | AT410807B (en) |
AU (1) | AU2003208156A1 (en) |
WO (1) | WO2003069056A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1876290A1 (en) * | 2006-07-07 | 2008-01-09 | Nippon Filcon Co., Ltd. | Press fabric for pulp machine |
DE202021104492U1 (en) | 2021-08-20 | 2021-10-06 | Heimbach Gmbh | Textile web and use of such |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3993588A (en) | 1973-12-13 | 1976-11-23 | The British Petroleum Company Limited | Polymerization catalyst |
US4115319A (en) | 1975-09-19 | 1978-09-19 | Montedison S.P.A. | Catalysts and catalyst components for polymerizing olefins |
US4351874A (en) * | 1980-03-24 | 1982-09-28 | Jwi, Ltd. | Low permeability dryer fabric |
US4452912A (en) | 1982-06-23 | 1984-06-05 | Ruhrchemie Aktiengesellschaft | Process for producing a supported catalyst for the polymerization of .alpha. |
US4468477A (en) | 1980-01-10 | 1984-08-28 | Imperial Chemical Industries Plc | Production of catalyst component, catalyst and use thereof |
US5225269A (en) * | 1989-06-28 | 1993-07-06 | Scandiafelt Ab | Press felt |
EP0704572A1 (en) * | 1991-12-18 | 1996-04-03 | Albany International Corp. | Press fabrics for paper machines |
US6284678B1 (en) * | 1997-10-03 | 2001-09-04 | Nippon Filcon Co., Ltd. | Forming belt for manufacturing construction materials and transfer belt for manufacturing construction materials |
-
2002
- 2002-02-12 AT AT2122002A patent/AT410807B/en not_active IP Right Cessation
-
2003
- 2003-02-10 WO PCT/AT2003/000038 patent/WO2003069056A1/en not_active Application Discontinuation
- 2003-02-10 AU AU2003208156A patent/AU2003208156A1/en not_active Abandoned
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3993588A (en) | 1973-12-13 | 1976-11-23 | The British Petroleum Company Limited | Polymerization catalyst |
US4115319A (en) | 1975-09-19 | 1978-09-19 | Montedison S.P.A. | Catalysts and catalyst components for polymerizing olefins |
US4468477A (en) | 1980-01-10 | 1984-08-28 | Imperial Chemical Industries Plc | Production of catalyst component, catalyst and use thereof |
US4351874A (en) * | 1980-03-24 | 1982-09-28 | Jwi, Ltd. | Low permeability dryer fabric |
US4452912A (en) | 1982-06-23 | 1984-06-05 | Ruhrchemie Aktiengesellschaft | Process for producing a supported catalyst for the polymerization of .alpha. |
US5225269A (en) * | 1989-06-28 | 1993-07-06 | Scandiafelt Ab | Press felt |
EP0704572A1 (en) * | 1991-12-18 | 1996-04-03 | Albany International Corp. | Press fabrics for paper machines |
US6284678B1 (en) * | 1997-10-03 | 2001-09-04 | Nippon Filcon Co., Ltd. | Forming belt for manufacturing construction materials and transfer belt for manufacturing construction materials |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1876290A1 (en) * | 2006-07-07 | 2008-01-09 | Nippon Filcon Co., Ltd. | Press fabric for pulp machine |
US7478655B2 (en) | 2006-07-07 | 2009-01-20 | Nippon Filcon Co., Ltd. | Press fabric for pulp machine |
DE202021104492U1 (en) | 2021-08-20 | 2021-10-06 | Heimbach Gmbh | Textile web and use of such |
EP4137636A1 (en) | 2021-08-20 | 2023-02-22 | Heimbach GmbH | Textile web and use |
Also Published As
Publication number | Publication date |
---|---|
AT410807B (en) | 2003-08-25 |
AU2003208156A1 (en) | 2003-09-04 |
ATA2122002A (en) | 2002-12-15 |
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