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EP0511951B1 - Presse à tamis sans fin, respectivement manchon - Google Patents

Presse à tamis sans fin, respectivement manchon Download PDF

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Publication number
EP0511951B1
EP0511951B1 EP19920890077 EP92890077A EP0511951B1 EP 0511951 B1 EP0511951 B1 EP 0511951B1 EP 19920890077 EP19920890077 EP 19920890077 EP 92890077 A EP92890077 A EP 92890077A EP 0511951 B1 EP0511951 B1 EP 0511951B1
Authority
EP
European Patent Office
Prior art keywords
press
roller
manchon
polyamide
textile fabric
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19920890077
Other languages
German (de)
English (en)
Other versions
EP0511951A1 (fr
Inventor
Friedrich Berger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huyck Austria GmbH
Original Assignee
Huyck Austria GmbH
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
Priority claimed from AT90791A external-priority patent/AT395187B/de
Priority claimed from AT90691A external-priority patent/AT395186B/de
Application filed by Huyck Austria GmbH filed Critical Huyck Austria GmbH
Publication of EP0511951A1 publication Critical patent/EP0511951A1/fr
Application granted granted Critical
Publication of EP0511951B1 publication Critical patent/EP0511951B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/08—Pressure rolls
    • 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
    • D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
    • D21F1/80—Pulp catching, de-watering, or recovering; Re-use of pulp-water using endless screening belts

Definitions

  • the invention relates to a wire belt press or to a manchon for pre-press rolls of a wire belt press according to the preambles of claims 1 and 5.
  • Belt presses of the type in question are mostly designed as twin-wire presses and are used primarily for dewatering the fiber materials used in the pulp and paper industry. In general, however, they can serve to thicken material suspensions.
  • the structure of such screen presses is shown, for example, in the company brochure "Doppelsiebpressen", A 01 4203 2000d-83 from the Andritz AG machine factory and can also be found in CH-A-531 360 (Andritz).
  • the dry matter content of the emerging fibrous web is usually around 34%.
  • a further increase in the dry matter content would be very desirable, but is not possible in practice, since in the last pair of press rolls the emerging fibrous web is rewetted by that liquid, usually water, which remains above all in the meshes of the upper rotating sieve and out of them Stitches come out of the pair of rollers into the fiber web.
  • the rubber rollers with a felt cover made of rolled wool felt. To apply such a sleeve to the rubber roller, it is pre-stretched in the wet state and dried in this form. After being pushed onto the roller, it is soaked with water, which releases the pre-tension in the felt and the Manchon sits firmly on the roller.
  • a rubber roller interacts directly with the fiber web produced on a screen.
  • the pre-press rolls of a belt press do not act directly on the fiber web, but between the fiber web and the pre-press rolls there is a lower or upper rotating screen. This leads to an unequally higher load on the roller surface, which a rubber roller known from rubber rollers would not be able to withstand.
  • JP-A-01 015 516 (Dantani-Plywood), which teaches by applying a felt tube to a steel roller by heat shrinking;
  • DE-A-3 433 780 (Katterbach), which describes an ironing roller which is provided with a wound cushion strip made of silicone rubber;
  • US-A-3,262,840 (Hervey) which shows in connection with paper manufacture the use of a dewatering roller which is provided with a porous nylon sleeve on its periphery;
  • EP-A-0 083 301 (Huber & Suhner), which describes a roller which consists of a glass fiber-reinforced polyester tube and a polymethane jacket sitting thereon, the polyester tube being applied to the actual roller core with the interposition of an adhesive layer;
  • EP-A-0 445 944 (David Bentley Ltd.), which shows a calender roll which consists of many compressed textile disks, heat-conducting rods running parallel to the axis being inserted for heat dissi
  • An object of the present invention is to improve a belt press of the type in question or a manch for pre-press rolls of a belt press in such a way that the rewetting effect is reduced and a higher dry content of the emerging fibrous web can be achieved.
  • the surface layer made of needle felt can absorb at least part of the liquid remaining in the mesh, so that the rewetting is less.
  • FIG. 1 shows a schematic side view of a twin wire belt press
  • FIG. 2 shows a schematic, enlarged side view of the last pair of pre-press rolls of a wire belt press according to FIG. 1 and the sieves passing between its rollers, together with the fiber web
  • FIG 4 a view similar to FIG. 3 the application of a needle felt strip to a pre-press roller
  • FIG. 5 a schematic side view of a pre-press roller, the core of which is surrounded by needle felt disks
  • FIG. 6 a section along the line VI - VI of FIG. 5.
  • a twin-wire belt press has an upper or lower rotating screen 1 or 2.
  • the screens run on the input side to form a wedge-shaped gap between upper and lower rolls of pairs of rolls 4, 5, 6 and 7, then run parallel to one another from the pair of rolls 7 starting at an angle upwards through pairs of pre-press rolls 8, 9 and 10. Both screens are over Drive and deflection rollers 11 are returned to the entrance of the belt press.
  • the aqueous suspension is introduced between the sieves 1, 2, pre-dewatered along the gap 3 between the roller pairs 4 to 7 and then further dewatered between the sieves and the roller pairs 8, 9 and 10, finally one Fibrous web 13 emerges, which is guided via a take-off roller 14 to further processing operations, in particular to further pressing or drying.
  • the top roller 10o is provided with a layer 16 of preferably synthetic needle felt. It has been shown that this layer 16 of needle felt can absorb at least part of the liquid remaining in the mesh of the sieve 1, as a result of which the rewetting of the fiber web 13 is reduced.
  • Fig. 3 shows schematically the use of a needle felt tube or manchons 17 together with a steel roller 18, this combination forming the pre-press roller 10o with its axis of rotation a. It has been shown that such a manchon 17 is expediently shrunk onto the steel roller 18, since this is the best way to meet the requirements of practice with relatively high contact forces and to keep the wear and tear within reasonable limits. Two examples of the manufacture and design of such a manchon 17 are given below.
  • a base fabric that has the following properties: Warp (longitudinal thread) 12 threads / cm, polyamide monofilament, 0.3 ⁇ with a minimum cooking shrinkage of 20% Weft (cross thread) 7 threads / cm in the ratio of two threads of polyamide carded yarn 120 tex / one thread of polypropylene monofilament 0.25 ⁇ weave 2/2 cross body.
  • a layer of polyamide fiber fur made of 17 dtex polyamide fiber with a cutting length of 80 mm and a fur weight of 170 g / m2 fur weight is needled onto this fabric.
  • This needle felt is needled one above the other in a spiral with the fur side facing outward, so that a tube with an inner diameter of 241 to 245 mm is formed, which is intended for a roller with an outer diameter of 240 mm.
  • eleven such layers are needled on top of each other.
  • the final m2 weight of the felt is 8500 g with a thickness of 16.5 mm.
  • a felt tube or manchon manufactured according to Example 1 is pushed over the steel roller 18 and then treated with boiling or hot water, as a result of which the sleeve 17 is shrunk onto the roller 18.
  • the pre-press roll 10o formed in this way is thus ready for use.
  • a manchon 17 can also be produced according to the following example and applied to the roller 18 in the same way.
  • the base fabric is designed as in Example 1.
  • a fur with approx. 170 g / m2, consisting of 60% polyamide, 17/80 and 40% wool with a fineness of 32 - 35 micrometers ⁇ is needled onto this fabric.
  • this needle felt is formed into a tube in eleven layers needled one above the other.
  • 17 layers of fur as in Example 1, but with 200 g / m2 of polyamide fiber with 22 dtex and 80 mm cutting length are needled, so that a felt tube with a m2 weight of the felt of 8500 g and a thickness of 17 mm is produced.
  • the use of such a manchon 17 has proven to be particularly practical.
  • it is possible to produce the needle felt layer 16 by winding up a felt strip 19 according to FIG. 4.
  • a felt strip 19 For this purpose, an approximately 5 to 10 cm wide needle felt strip is wound onto the steel roller 18 under strong tension by rotating the roller 18.
  • the following example gives the composition and manufacture of a needle felt strip suitable for this purpose.
  • a basic fabric is used, the warp (longitudinal thread) of which consists of a high-strength polyamide filament with 12 threads / cm and 940 dtex.
  • the weft (cross thread) is 6.5 Fd / cm and consists of carded yarn or monofilament in the ratio of 2 threads of polyamide carded yarn 120 dtex, 2 threads of polypropylene monofilament 0.25 ⁇ .
  • Binding 2/2 cross body Binding 2/2 cross body.
  • a fur made of polyamide 17/80 with 170g / m2 is needled onto this fabric.
  • a felt sheet of 50x2 m for example, is formed.
  • twenty layers of fur made of polyamide 17/80 with 170 g / m2 are needled and brought to a thickness of about 17 mm through approx. 50 finishing passages.
  • the weight of the finished felt is approx. 8500 g.
  • the pre-press roll 10o here consists of a steel core 20, onto which needle felt disks 21 lying next to one another are pushed.
  • the parallel felt disks are firmly pressed together in the direction of the roller axis a by means of clamping plates 22 arranged at the ends with the aid of tensioning rods 23 and corresponding nuts 24.
  • the individual needle felt disks 21 are punched out of a generally non-woven needle felt, corresponding holes being formed for receiving the core 20 or the tension rods 23. After the needle felt disks 21 have been placed on the core and clamped together by means of the clamping plates 22 and the clamping rods 23, the pre-pressing roller 10o thus formed is turned to the exact cylinder shape on the circumference and is then ready for use.
  • the following example describes the composition and manufacture of a needle felt that is suitable for forming a pre-press roll according to FIGS. 5 and 6.
  • a heavy, non-woven needle felt of 800 g / m2 is formed from a polyamide 17/80 fur with 200 g / m2 by needling 40 layers on top of each other and then brought to a thickness of about 18 mm by a larger number of finish passages.
  • the needle felt layer by gluing on a suitably cut felt web.
  • a felt designed and manufactured according to Example 4 can be used.
  • the pre-press roller 10o previously used as a smooth steel roller, namely the upper roller of the last pair of pre-press rollers 10, was replaced on a twin-wire belt press by a pre-press roller designed according to the invention. It was shown that an increase in the dry matter content by up to 5% was possible compared to the dry matter content that could be achieved to date.
  • the two rolls of the last pair of pre-press rolls 10 can be designed in accordance with the invention, it is possible to also design other rolls of a twin-wire belt press in accordance with the invention.
  • the invention can also be used in belt presses with only a single rotating screen.
  • the mechanical strength of the needle felt tube 16 or the sleeve 17 on the steel roller 10o has proven to be so good that service lives can be achieved which are hardly less than when using steel rollers with a rubber cover or rubber.
  • the shrinkage of the longitudinal thread (chain) of the thread that runs in the circumferential direction of the needle felt tube 16 is essential.
  • the shrinking takes place by the action of heat, but the use of needle felts is possible, in which the shrinkage is caused by other physical or chemical actions.
  • the tensioning force of the needle felt tube 16 on the steel roller which is applied by the shrinkage is so great that there is no loosening in the circumferential direction.
  • the base fabric can of course have a triggerable shrinkage in warp and weft, but is essentially that in the circumferential direction of the tube.
  • the fibers of the fur can also shrink. This is usually less than 20%, e.g. Be 10% or less.
  • the fibers of the fur counteract the shrinkage of the base fabric threads when shrinking the needle felt tube, e.g. a boil shrinkage of 20% to a total shrinkage of the tube of about 10%.

Landscapes

  • Paper (AREA)
  • Nonwoven Fabrics (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)

Claims (10)

  1. Presse à tamis sans fin, notamment presse à deux tamis sans fin, pour l'épaississement de suspensions pâteuses, notamment pour l'égouttage de matières fibreuses, comportant un train de cylindres, consistant en une pluralité de paires de cylindres (4 à 7) avec un écartement entre eux devenant progressivement plus petit, ce train étant suivi par des paires de cylindres de précompression (8, 9, 10), ainsi qu'avec au moins un tamis sans fin (1, 2) passant autour des paires de cylindres et de cylindres de précompression,
       caractérisée en ce que,
       à l'extrémité du côté sortie de la presse, au moins le cylindre de précompression supérieur (10o) d'au moins la dernière paire de cylindres de précompression (10) possède au moins une couche superficielle en feutre aiguilleté.
  2. Presse à tamis sans fin selon la revendication 1, caractérisée en ce que le cylindre de précompression (10o) est un cylindre en acier (18) avec une couche de feutre aiguilleté (16) appliquée sur lui.
  3. Presse à tamis sans fin selon la revendication 2, caractérisée en ce qu'une couche de feutre aiguilleté (16) est collée, enroulée ou emmanchée par frettage sur le cylindre en acier (18).
  4. Presse à tamis sans fin selon la revendication 1, caractérisée en ce que le cylindre de précompression (10o) consiste en un mandrin (20) qui est entouré par des disques de feutre aiguilleté (21) disposés les uns contre les autres et pressés les uns contre les autres en direction de l'axe du cylindre.
  5. Manchon pour des cylindres de précompression d'une presse à tamis sans fin, caractérisé en ce qu'il est configuré en tant que tube en feutre aiguilleté (16), et en ce qu'il consiste en au moins une couche d'un tissu de base synthétique sur lequel sont aiguilletées des fibres, qui comportent une fraction minimale de 50 % de fibres synthétiques, de préférence de fibres de polyamide, les fils du tissu de base s'étendant dans le sens périphérique du tube (16) présentant un retrait déclenchable d'au moins 20 %.
  6. Manchon selon la revendication 5, caractérisé en ce que le tissu de base présente dans le sens périphérique un retrait à ébullition, c'est-à-dire un retrait dans l'eau bouillante, de 20 % ou davantage.
  7. Manchon selon la revendication 5 ou 6, caractérisé en ce que les fibres sont des fibres de polyamide avec une finesse d'environ 17 dtex et une longueur de coupe d'environ 80 mm.
  8. Manchon selon l'une des revendications 5 à 7, caractérisé en ce que le tissu de base consiste en une matière de polyamide et/ou de polypropylène.
  9. Manchon selon la revendication 8, caractérisé en ce que les fils du tissu de base qui s'étendent dans le sens périphérique sont un monofilament de polyamide avec un retrait à ébullition d'au moins 20 %.
  10. Manchon selon la revendication 9, caractérisé en ce que les fils du tissu de base, qui s'étendent parallèlement à l'axe du tube, consistent en un fil cardé de polyamide et en un monofilament de polypropylène.
EP19920890077 1991-04-30 1992-04-02 Presse à tamis sans fin, respectivement manchon Expired - Lifetime EP0511951B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
AT90791A AT395187B (de) 1991-04-30 1991-04-30 Manchon
AT906/91 1991-04-30
AT907/91 1991-04-30
AT90691A AT395186B (de) 1991-04-30 1991-04-30 Siebbandpresse

Publications (2)

Publication Number Publication Date
EP0511951A1 EP0511951A1 (fr) 1992-11-04
EP0511951B1 true EP0511951B1 (fr) 1995-10-11

Family

ID=25594284

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920890077 Expired - Lifetime EP0511951B1 (fr) 1991-04-30 1992-04-02 Presse à tamis sans fin, respectivement manchon

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EP (1) EP0511951B1 (fr)
DE (1) DE59203943D1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT405656B (de) * 1997-07-01 1999-10-25 Andritz Patentverwaltung Vorrichtung zur entwässerung von feststoff-flüssigkeitssuspensionen, insbesondere faserstoffsuspensionen
AT404946B (de) * 1997-07-01 1999-03-25 Andritz Patentverwaltung Vorrichtung zur entwässerung von feststoff-flüssigkeitssuspensionen, insbesondere faserstoffsuspensionen
DE102012207095A1 (de) * 2012-04-27 2013-10-31 Voith Patent Gmbh Walze und Verfahren zu deren Herstellung

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3262840A (en) * 1963-09-20 1966-07-26 Little Inc A Method and apparatus for removing liquids from fibrous articles using a porous polyamide body
AT313045B (de) * 1971-04-05 1974-01-25 Andritz Ag Maschf Presse für die Entwässerung von Stoffen, insbesondere Zellstoff od.dgl. Fasermaterial
DE3268452D1 (en) * 1981-12-23 1986-02-20 Huber+Suhner Ag Roller with resilient cover
DE3228607A1 (de) * 1982-07-30 1984-02-02 Rudolf Dipl.-Ing. 8036 Herrsching Dietl Walze, insbesondere papiermaschinenwalze
DE3433780A1 (de) * 1984-09-14 1986-03-27 Helmut 5202 Hennef Katterbach Buegelwalze, insbesondere fuer den waeschereibetrieb
GB9005072D0 (en) * 1990-03-07 1990-05-02 Bentley David Ltd Improvements relating to calender and embossing bowls

Also Published As

Publication number Publication date
DE59203943D1 (de) 1995-11-16
EP0511951A1 (fr) 1992-11-04

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