EP0440076B1 - Feutre de presse - Google Patents

Feutre de presse Download PDF

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Publication number
EP0440076B1
EP0440076B1 EP91100783A EP91100783A EP0440076B1 EP 0440076 B1 EP0440076 B1 EP 0440076B1 EP 91100783 A EP91100783 A EP 91100783A EP 91100783 A EP91100783 A EP 91100783A EP 0440076 B1 EP0440076 B1 EP 0440076B1
Authority
EP
European Patent Office
Prior art keywords
press felt
paper
barrier layer
material web
layer
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
EP91100783A
Other languages
German (de)
English (en)
Other versions
EP0440076A2 (fr
EP0440076A3 (en
Inventor
Sylvester Eschmann
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.)
Heimbach GmbH and Co KG
Original Assignee
Thomas Josef Heimbach and Co 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
Application filed by Thomas Josef Heimbach and Co GmbH filed Critical Thomas Josef Heimbach and Co GmbH
Publication of EP0440076A2 publication Critical patent/EP0440076A2/fr
Publication of EP0440076A3 publication Critical patent/EP0440076A3/de
Application granted granted Critical
Publication of EP0440076B1 publication Critical patent/EP0440076B1/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
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/08—Felts
    • D21F7/083—Multi-layer felts

Definitions

  • the invention relates to a press felt for the press area of a paper machine with a carrier material web made of one or more woven or knitted fabrics and a fiber layer applied at least on the paper side and connected to the carrier material web, the surface of which forms the paper contact side.
  • Press felts are known from numerous publications, for example from US Pat. No. 4,283,454 and US Pat. No. 4,564,985. Both publications show a press felt which, on the side facing away from the paper contact side, has a carrier material web which consists of two superimposed fabrics. These two tissues are connected to each other by a needled fiber layer, in that the fibers have been needled deep into both tissues. The top of the fiber layer then forms the soft paper contact side.
  • press felts are known, the backing material webs of which are formed from thread layers (EP-A-0 ⁇ 0 ⁇ 38 276), a fiber layer also being able to be provided between the individual thread layers (US Pat. No. 4,781,967).
  • the top thread laid in each case runs in the longitudinal direction.
  • the individual layers of thread are not integrated with each other.
  • a press felt is known from US Pat. No. 1,651,476, in which a web of carrier material is formed onto a web Fiber layer is glued, the gluing being carried out by means of an adhesive layer applied to the carrier material web.
  • This adhesive layer is porous and therefore permeable to the liquid squeezed out of the paper web.
  • press felts there is the problem of rewetting the paper web after leaving the press nip.
  • the previously compressed press felt then increases its cross section. This causes a delay in the water flow.
  • the water follows the higher capillarity and is distributed over the entire press felt cross section up to the paper contact side. In this way, part of the water already removed from the paper web is returned to it.
  • a press felt is proposed in US Pat. No. 4,772,50 774, in which the paper contact side is formed by a surface layer applied to the felt layer.
  • This surface layer consists of plastic, for example a plastic foam, the pores of which are to be almost completely filled by a sealing material. Accordingly, the maximum values given for the permeability of the surface layer are extremely low and tend towards zero.
  • the surface layer is intended to have a greater resistance to the water in the felt towards the paper contact side than towards the other side, thereby preventing rewetting of the paper web.
  • the invention has for its object to form a press felt of the type mentioned so that its drainage performance is improved, in particular by reducing the rewetting of the paper web.
  • the permeable layer is designed as a barrier layer with a surface coverage of 45% to 85%, the barrier layer having elongated passage openings oriented in the transverse direction.
  • the layer serving as an adhesive layer in the generic press felt is designed as a barrier layer which reduces the flow cross-section to 15% to 55% of the area of the press felt.
  • the result of this is that the water flowing through the press felt is accelerated in the area of the barrier layer due to the nozzle effect of the passage openings.
  • This creates a pressure gradient that propagates up to the paper web in the area between the paper contact side and the barrier position, which sucks the water out of the paper web as it were.
  • the passage openings are elongated and oriented in the transverse direction. They then act like foils, which are used in the forming area of paper machines, and thus support the aforementioned suction effect. Despite the area coverage caused by the blocked location, the drainage is even improved.
  • the blocking position After leaving the press nip, the blocking position practically acts as a check valve.
  • the felt then wants to expand again, but due to the blocked position, there is little air or Draw moisture from the area below the barrier layer.
  • the press felt does not expand so quickly, which means that it lifts off the paper web earlier. The rewetting is thereby reduced to a minimum.
  • the press felt according to the invention thus has a significantly improved drainage performance.
  • the barrier layer can be applied directly to the carrier material web. If the fiber layer is then needled into the carrier material web, it is still located within the fiber layer. However, there is also the possibility that the barrier layer is arranged at a distance from the carrier material web, the spacing of the barrier layer from the paper contact side is expediently at most as large as the distance from the carrier material web, the barrier layer therefore preferably in the area adjacent to the paper contact side - but not in its surface - lies.
  • the passage openings are preferably designed as elongated slots which extend in the transverse direction and should be formed as continuously as possible.
  • the slots are then preferably formed by transverse threads arranged at a distance from one another, which represent the blocking position. It is particularly advantageous if the transverse threads are designed as flat wires, as are known for example from EP-PS 0 ⁇ 0 ⁇ 98 612. The foil effect mentioned above is then particularly pronounced.
  • the press felt can be produced by first forming a fabric from the said transverse threads and from dissolvable, in particular water-soluble, longitudinal threads, and after the production of the press felt, the longitudinal threads are detached by soaking with a solvent. The cross threads forming the blocking position then remain.
  • the press felt (1) shown in the figures has a carrier fabric (2) in the lower region, which consists of two layers of longitudinal threads - denoted by (3) for example - and transverse threads integrating the longitudinal threads of both layers - denoted by (4), for example .
  • the longitudinal threads (3) and the transverse threads (4) are designed as monofilaments. Suitable plastics, for example polyamides or polyesters, are used as the material for this.
  • the free side is the paper contact side (6).
  • a barrier layer (7) is inserted, which consists of a plurality of flat wires extending in the transverse direction - that is, transverse to the running direction of the press felt (1) - designated by (8) for example.
  • the blocking position (7) runs parallel to the paper contact side (6).
  • the flat wires (8) are also made of plastic and have an approximately rectangular cross section, the extent in the plane of the barrier layer (7) being considerably larger than perpendicular to it.
  • the flat wires (8) are kept at a distance such that slots are formed between them, for example designated (9). According to the invention, the total passage cross section of these slots (9) should make up between 15% and 55% of the total area of the press felt (1).
  • this press felt (1) can be carried out in the following way be performed. First the base fabric (2) is woven. A first nonwoven layer is then placed on the carrier fabric (2) and needled to the carrier fabrics (2). At the same time, the barrier layer (7) is first produced in the form of a fabric by binding the flat wires (8) with water-soluble longitudinal threads, for example made of polyvinyl alcohol. This barrier layer (7) in tissue form is placed on the first part of the fiber layer (5). Then another non-woven layer is placed on the barrier layer (7) and needled to the remaining part of the press felt (1). Finally, the press felt (1) is subjected to a water treatment which results in the longitudinal threads of the barrier layer (7) being detached. Only the flat wires (8) remain. The press felt (1) then has the structure shown in Figures (1) and (2).
  • the flat wires (8) in the area of the press nip cause the water on the flat wires (8) to be deflected and accelerated in the area of the slots (9). This creates a similar effect to that of foils in the forming area of paper machines.
  • the water moves faster than the press felt (1), which creates a suction effect in the area of the paper contact side (6).
  • the press felt (1) When leaving the press nip, a vacuum is created above the barrier layer (7) because the previously compressed press felt (1) wants to expand again, but hardly any air or moisture can be drawn in from below. Above the barrier layer (7), the press felt (1) is no longer filled with water. Since the press felt (1) expands only after a delay, it lifts off the paper web (1) earlier, so that the residual moisture that is not present above the barrier layer (7) is no longer released to the paper web.

Landscapes

  • Paper (AREA)
  • Presses And Accessory Devices Thereof (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Water Treatment By Sorption (AREA)

Claims (7)

  1. Feutre de pressage (1) pour la section des presses d'une machine à papier, comprenant une bande de matériau de support (2), faite d'un ou plusieurs tissus ou étoffes à mailles, et au moins une couche de fibres (5) appliquée sur le côté papier et reliée à la bande de matériau de support (2), couche de fibres dont la surface constitue le côté (6) venant en contact avec le papier et dans laquelle une couche perméable (7) est disposée entre le côté (6) venant en contact avec le papier et la bande de matériau de support (2), caractérisé en ce que la couche perméable est réalisée comme une couche d'arrêt (7) ayant un recouvrement de surface de 45% à 85% et qui présente des orifices de passage oblongs (9) orientés dans le sens transversal.
  2. Feutre de pressage selon la revendication 1, caractérisé en ce que la couche d'arrêt (7) est disposée à distance de la bande de matériau de support (2).
  3. Feutre de pressage selon la revendication 2, caractérisé en ce que la distance de la couche d'arrêt (7) au côté (6) venant en contact avec le papier est tout au plus aussi grande que la distance qui la sépare de la bande de matériau de support (2).
  4. Feutre de pressage selon une des revendications 1 à 3, caractérisé en ce que les orifices de passage sont réalisés comme des fentes (9) de forme allongée.
  5. Feutre de pressage selon la revendication 4, caractérisé en ce que les fentes (9) sont réalisées de façon continue.
  6. Feutre de pressage selon la revendication 5, caractérisé en ce que les fentes (9) sont formées par des fils transversaux (8) disposés à distance l'un de l'autre.
  7. Feutre de pressage selon la revendication 6, caractérisé en ce que les fils transversaux sont réalisés sous forme de fils plats (8).
EP91100783A 1990-01-31 1991-01-23 Feutre de presse Expired - Lifetime EP0440076B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4002761 1990-01-31
DE4002761A DE4002761A1 (de) 1990-01-31 1990-01-31 Pressfilz

Publications (3)

Publication Number Publication Date
EP0440076A2 EP0440076A2 (fr) 1991-08-07
EP0440076A3 EP0440076A3 (en) 1991-10-16
EP0440076B1 true EP0440076B1 (fr) 1994-06-29

Family

ID=6399101

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91100783A Expired - Lifetime EP0440076B1 (fr) 1990-01-31 1991-01-23 Feutre de presse

Country Status (7)

Country Link
EP (1) EP0440076B1 (fr)
AT (1) ATE107980T1 (fr)
CA (1) CA2034956C (fr)
DE (2) DE4002761A1 (fr)
DK (1) DK0440076T3 (fr)
ES (1) ES2058943T3 (fr)
FI (1) FI93239C (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9125889D0 (en) * 1991-12-05 1992-02-05 Albany Research Uk Improvements in and relating to paper machine clothing
DE4232319A1 (de) * 1992-09-26 1994-03-31 Franz F Kufferath Mehrlagiges Pressensieb für Naßpressen einer Papiermaschine
GB9713309D0 (en) * 1996-11-08 1997-08-27 Scapa Group Plc Papermachine clothing
US6592636B1 (en) * 2000-11-28 2003-07-15 Albany International Corp. Flow control within a press fabric using batt fiber fusion methods
US7297233B2 (en) * 2004-01-30 2007-11-20 Voith Paper Patent Gmbh Dewatering apparatus in a paper machine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4482601A (en) * 1983-05-31 1984-11-13 Albany International Corp. Wet press papermakers felt and method of fabrication
US4500588A (en) * 1982-10-08 1985-02-19 Tamfelt Oy Ab Conveyor felt for paper making and a method of manufacturing such a felt
US4529643A (en) * 1982-10-08 1985-07-16 Tamfelt Oy Ab Press felt for paper making and a method of manufacturing such a felt
US4657806A (en) * 1985-03-25 1987-04-14 Albany International Corp. Wet press papermakers felt

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1651476A (en) * 1925-12-17 1927-12-06 William E Sheehan Web carrier for paper-making machines
US3214327A (en) * 1963-04-16 1965-10-26 Huyck Corp Papermakers' felts and method for dewatering paper and similar webs
GB1455843A (en) * 1973-01-31 1976-11-17 Scapa Porritt Ltd Paper makers wet felts
US4283454A (en) * 1980-02-08 1981-08-11 Porritts & Spencer Inc. Papermakers wet felt with ribbed and smooth surface textures
FR2482147A1 (fr) * 1980-04-16 1981-11-13 Binet Et Cie Ets Louis Feutre humide pour papeterie
JPS5887392A (ja) * 1981-10-08 1983-05-25 日本フエルト株式会社 製紙用フエルト及びその製造方法
US4414263A (en) * 1982-07-09 1983-11-08 Atlanta Felt Company, Inc. Press felt
FI77907C (fi) * 1985-08-23 1989-05-10 Tamfelt Oy Ab Pressfilt.
US4781967A (en) * 1987-10-07 1988-11-01 The Draper Felt Company, Inc. Papermaker press felt

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4500588A (en) * 1982-10-08 1985-02-19 Tamfelt Oy Ab Conveyor felt for paper making and a method of manufacturing such a felt
US4529643A (en) * 1982-10-08 1985-07-16 Tamfelt Oy Ab Press felt for paper making and a method of manufacturing such a felt
US4482601A (en) * 1983-05-31 1984-11-13 Albany International Corp. Wet press papermakers felt and method of fabrication
US4657806A (en) * 1985-03-25 1987-04-14 Albany International Corp. Wet press papermakers felt

Also Published As

Publication number Publication date
FI93239C (fi) 1995-03-10
DE59102041D1 (de) 1994-08-04
CA2034956C (fr) 2001-08-21
FI910402A (fi) 1991-08-01
ATE107980T1 (de) 1994-07-15
DK0440076T3 (da) 1994-10-31
ES2058943T3 (es) 1994-11-01
EP0440076A2 (fr) 1991-08-07
DE4002761C2 (fr) 1991-11-28
FI910402A0 (fi) 1991-01-28
DE4002761A1 (de) 1991-08-01
EP0440076A3 (en) 1991-10-16
CA2034956A1 (fr) 1991-08-01
FI93239B (fi) 1994-11-30

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