EP0437232A1 - Wet circuit of a paper making press with centrifugal dewatering of the press felt - Google Patents

Wet circuit of a paper making press with centrifugal dewatering of the press felt Download PDF

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Publication number
EP0437232A1
EP0437232A1 EP91100167A EP91100167A EP0437232A1 EP 0437232 A1 EP0437232 A1 EP 0437232A1 EP 91100167 A EP91100167 A EP 91100167A EP 91100167 A EP91100167 A EP 91100167A EP 0437232 A1 EP0437232 A1 EP 0437232A1
Authority
EP
European Patent Office
Prior art keywords
felt
wet
press
water
centrifuge device
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.)
Granted
Application number
EP91100167A
Other languages
German (de)
French (fr)
Other versions
EP0437232B1 (en
Inventor
Patrick Penven
Jacques Valois
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.)
COFPA Compagnie des Feutres pour Papeteries et des Tissus Industriels SA
Original Assignee
COFPA Compagnie des Feutres pour Papeteries et des Tissus Industriels SA
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.)
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Publication date
Application filed by COFPA Compagnie des Feutres pour Papeteries et des Tissus Industriels SA filed Critical COFPA Compagnie des Feutres pour Papeteries et des Tissus Industriels SA
Publication of EP0437232A1 publication Critical patent/EP0437232A1/en
Application granted granted Critical
Publication of EP0437232B1 publication Critical patent/EP0437232B1/en
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
    • D21F7/12—Drying

Definitions

  • the present invention relates to a wet circuit of a stationery press comprising a wet felt and a centrifuge device imparting to the wet felt a path of strong curvature causing the rejection of water by centrifugation, said wet felt comprising a canvas provided with a upper thick water-absorbent sheet.
  • the centrifuge device requires no external energy.
  • the wet circuit according to the invention with centrifuge device making it unnecessary to use a suction system is characterized in that the lower layer of the wet felt in contact with the centrifuge device is impermeable.
  • water can be sent to the impermeable layer upstream of the centrifuge device, which promotes the sliding of the felt on the device without increasing the amount of water in the felt.
  • FIG. 1 and 2 shows a wet circuit according to the invention.
  • FIG. 3 represents a centrifuge device for a wet circuit according to the invention.
  • FIGS 4 to 6 show wet felts according to the invention.
  • the stationery press wet circuit according to the invention is shown in Figure 1.
  • the wet felt 1 rotates in a closed circuit and passes between two press cylinders 2 while supporting the sheet 3.
  • This felt 1 is to extract part of the water transported by the sheet 3.
  • the felt After passing between the press cylinders 2, the felt is charged with moisture and it passes around a cylinder 4 of small diameter.
  • This cylinder must be at most 6 inches in diameter (15 cm), preferably the diameter will be close to 2 inches (5 cm) so that the centrifugal force is sufficient to eject the water.
  • the wet felt 1 comprises a canvas 7, a thick upper sheet 8 intended to be in contact with the sheet and a lower sheet 9.
  • This lower sheet 9 consists of an impermeable layer which can for example be fixed to the canvas 7 by gluing ( Figure 4) or by induction ( Figure 5) or consisting of a permeable layer 10 on which is bonded an impermeable sheet 11 ( Figure 6).
  • the press cylinders 2 no longer need to be grooved or suction since the underside of the felt 3 being impermeable, it forms a barrier blocking the movement of water towards these cylinders 2. It is therefore possible to use full cylinders 2 .
  • the centrifugation force depends on the square of the speed of the felt and is inversely proportional to the radius of the centrifuge cylinder 5 which is the radius of curvature of the trajectory of the felt.

Abstract

The wet circuit for a paper-making press comprises a press felt (1), and a centrifugal device (4) giving the press felt (1) a highly curved trajectory causing the ejection of water by centrifugation. The press felt (1) consists of a canvas sheet with a thick upper water-absorbent layer. The bottom layer of the press felt (1) in contact with the centrifugal device (4) is impermeable. Thorough dewatering of press felts. <IMAGE>

Description

La présente invention concerne un circuit humide d'une presse de papeterie comprenant un feutre humide et un dispositif centrifugeur imprimant au feutre humide une trajectoiçre de forte courbure entraînant le rejet de l'eau par centrifugation, ledit feutre humide comportant un canevas muni d'une nappe épaisse supérieure absorbant à l'eau.The present invention relates to a wet circuit of a stationery press comprising a wet felt and a centrifuge device imparting to the wet felt a path of strong curvature causing the rejection of water by centrifugation, said wet felt comprising a canvas provided with a upper thick water-absorbent sheet.

Un tel circuit humide est décrit dans le document US-A-329 8904.Such a wet circuit is described in document US-A-329 8904.

Le dispositif centrifugeur ne nécessite aucune énergie extérieure.The centrifuge device requires no external energy.

Toutefois la déshydration du feutre dans le circuit connu est insuffisante et il faut prévoir en supplément un système aspirant.However, the dehydration of the felt in the known circuit is insufficient and a suction system must be provided in addition.

Le circuit humide selon l'invention avec dispositif centrifugeur rendant inutile l'utilisation d'un système aspirant est caractérisé en ce que la nappe inférieure du feutre humide au contact du dispositif centrifugeur est imperméable.The wet circuit according to the invention with centrifuge device making it unnecessary to use a suction system is characterized in that the lower layer of the wet felt in contact with the centrifuge device is impermeable.

Une nappe inférieure imperméable est constituée d'une couche imperméable ou d'une couche perméable revêtue d'une feuille imperméable.

  • · La présence d'une nappe imperméable en contact avec le dispositif centrifugeur favorise le glissement sur ce dispositif et diminue l'abrasion.
An impermeable lower layer consists of an impermeable layer or a permeable layer coated with an impermeable sheet.
  • · The presence of an impermeable sheet in contact with the centrifuge device promotes sliding on this device and reduces abrasion.

De plus on peut envoyer de l'eau sur la couche imperméable en amont du dispositif centrifugeur ce qui favorise le glissement du feutre sur le dispositif sans augmenter la quantité d'eau dans le feutre.In addition, water can be sent to the impermeable layer upstream of the centrifuge device, which promotes the sliding of the felt on the device without increasing the amount of water in the felt.

Les figures 1 et 2 représente un circuit humide selon l'invention.Figures 1 and 2 shows a wet circuit according to the invention.

La figure 3 représente un dispositif centrifugeur pour circuit humide selon l'invention.FIG. 3 represents a centrifuge device for a wet circuit according to the invention.

Les figure 4 à 6 représentent des feutres humides selon l'invention.Figures 4 to 6 show wet felts according to the invention.

Le circuit humide de presse de papeterie selon l'invention est représenté à la figure 1.The stationery press wet circuit according to the invention is shown in Figure 1.

Le feutre humide 1 tourne en circuit fermé et passe entre deux cylindres de presse 2 en supportant la feuille 3.The wet felt 1 rotates in a closed circuit and passes between two press cylinders 2 while supporting the sheet 3.

La fonction de ce feutre 1 est d'extraire une partie de l'eau transportée par la feuille 3.The function of this felt 1 is to extract part of the water transported by the sheet 3.

Après son passage entre les cylindres de presse 2 le feutre est chargé d'humidité et il passe autour d'un cylindre 4 de faible diamètre.After passing between the press cylinders 2, the felt is charged with moisture and it passes around a cylinder 4 of small diameter.

Ce cylindre doit avoir au plus 6 pouces de diamètre (15 cm), de préférence le diamètre sera voisin de 2 pouces (5 cm) pour que la force centrifuge soit suffisante pour éjecter l'eau.This cylinder must be at most 6 inches in diameter (15 cm), preferably the diameter will be close to 2 inches (5 cm) so that the centrifugal force is sufficient to eject the water.

L'angle α dont tourne le feutre autour de ce cylindre 4 sera au moins égal à 270°. Il sera de préférence égal à 300° (figure 1) mais pourrait atteindre 360° (figure 2).

  • · Plus cet angle est important plus la force centrifuge s'exerce pendant longtemps, ce qui améliore l'extraction de l'eau. D'autre part cette force centrifuge dépend du carré de la vitesse si bien que le dispositif de centrifugation selon l'invention donne les meilleurs résultats pour des vitesses de défilement de 1000 m/min et au dessus.
  • · Ce cylindre de centrifugation 4 peut être constitué sous forme de tête en céramique 5 (voir figure 3) ou autre matériau résistant à l'abrasion montée sur un support 6 en matériau léger ou composite.
    Compte tenu de la largeur des feutres qui peut dépasser la dizaine de mètres, il est important d'avoir un support léger qui conserve sa rigidité sur toute la largeur du feutre.
The angle α with which the felt rotates around this cylinder 4 will be at least equal to 270 °. It will preferably be equal to 300 ° (Figure 1) but could reach 360 ° (Figure 2).
  • · The larger this angle, the longer the centrifugal force is exerted, which improves water extraction. On the other hand this centrifugal force depends on the square of the speed so that the centrifuge device according to the invention gives the best results for running speeds of 1000 m / min and above.
  • This centrifuge cylinder 4 can be made in the form of a ceramic head 5 (see FIG. 3) or other abrasion-resistant material mounted on a support 6 made of light or composite material.
    Given the width of the felts which can exceed ten meters, it is important to have a light support which retains its rigidity over the entire width of the felt.

Le feutre humide 1 comporte un canevas 7, une nappe supérieure épaisse 8 destinée à être en contact avec la feuille et une nappe inférieure 9. Cette nappe inférieure 9 est constituée d'un couche imperméable qui peut être par exemple fixée au canevas 7 par collage (figure 4) ou par induction (figure 5) ou constitué d'une couche perméable 10 sur laquelle est collée une feuille imperméable 11 (figure 6).The wet felt 1 comprises a canvas 7, a thick upper sheet 8 intended to be in contact with the sheet and a lower sheet 9. This lower sheet 9 consists of an impermeable layer which can for example be fixed to the canvas 7 by gluing (Figure 4) or by induction (Figure 5) or consisting of a permeable layer 10 on which is bonded an impermeable sheet 11 (Figure 6).

Grâce au caractère imperméable de la nappe inférieure 9 l'eau se trouve bloquée au-dessus de cette nappe 11 et s'évacue ainsi plus aisément. De plus il y a ainsi moins de frottement entre le feutre 1 et le cylindre de centrifugation 4. Enfin on peut encore diminuer ces frottements en projetant de l'eau avec des moyens 12 sur la nappe inférieure 9 en amont du cylindre de centrifugation 4 et cette eau ne remouille pas le feutre 1 (voir figure 1 et 2).Thanks to the waterproof nature of the lower layer 9 water is blocked above this ply 11 and is thus more easily removed. In addition, there is thus less friction between the felt 1 and the centrifuge cylinder 4. Finally, this friction can be further reduced by spraying water with means 12 on the lower ply 9 upstream of the centrifuge cylinder 4 and this water does not rewet the felt 1 (see figure 1 and 2).

Les cylindres de presse 2 n'ont plus besoin d'être rainurés ou aspirants puisque la face inférieure du feutre 3 étant imperméable, elle forme une barrière bloquant le mouvement de l'eau vers ces cylindres 2. On peut donc utiliser des cylindres 2 pleins.The press cylinders 2 no longer need to be grooved or suction since the underside of the felt 3 being impermeable, it forms a barrier blocking the movement of water towards these cylinders 2. It is therefore possible to use full cylinders 2 .

La force de centrifugation dépend du carré de la vitesse du feutre et est inversement proportionnelle au rayon du cylindre de centrifugation 5 qui est le rayon de courbure de la trajectoire du feutre.The centrifugation force depends on the square of the speed of the felt and is inversely proportional to the radius of the centrifuge cylinder 5 which is the radius of curvature of the trajectory of the felt.

On choisira donc le rayon inférieur à 3 pouces en tenant compte de la vitesse de défilement du feutre pour que l'extraction de l'eau soit suffisante.We will therefore choose the radius less than 3 inches taking into account the speed of travel of the felt so that the water extraction is sufficient.

Avec un cylindre de 2 pouces (5 cm) de diamètre et un angle α de 300° on a obtenu pour un feutre contenant 600 g/m² d'eau une extraction d'eau par centrifugation de 30 g/m² à 900 m/min et de 95 g/m² à 1300 m/min. Avec le même feutre contenant 900 g/m² d'eau on a extrait 105 g/m² à 900 m/min et 185 g/m² à 1300m/min.With a 2 inch (5 cm) diameter cylinder and an angle α of 300 °, a water extraction by centrifugation of 30 g / m² at 900 m / min was obtained for a felt containing 600 g / m² of water. and from 95 g / m² at 1300 m / min. With the same felt containing 900 g / m² of water, 105 g / m² were extracted at 900 m / min and 185 g / m² at 1300m / min.

Avec des vitesses de l'ordre de 1600 m/min l'extraction serait encore augmentée.With speeds of the order of 1600 m / min the extraction would be further increased.

Claims (5)

Circuit humide d'une presse de papeterie comportant des cylindres de presse (2) un feutre humide (1) supportant la feuille de papier (3) et passant entre les cylindres de presse (2), un dispositif centrifugeur (4) imprimant au feutre humide (1) une trajectoire de forte courbure entraînant le rejet de l'eau par centrifugation, ledit feutre humide (1) comportant un canevas (7) muni d'une nappe épaisse supérieure (8) au contact de la feuille (3) et absorbant l'eau, caractérisé en ce que la nappe inférieure (7) du feutre humide (1) au contact du dispositif centrifugeur (4) est imperméable.Wet circuit of a stationery press comprising press rolls (2) a wet felt (1) supporting the sheet of paper (3) and passing between the press rolls (2), a centrifuge device (4) printing on the felt wet (1) a path of strong curvature causing the rejection of water by centrifugation, said wet felt (1) comprising a canvas (7) provided with a thick upper sheet (8) in contact with the sheet (3) and water-absorbent, characterized in that the lower layer (7) of the wet felt (1) in contact with the centrifuge device (4) is impermeable. Circuit humide selon la revendication 1 caractérisé en ce qu'il comporte des moyens (12) pour envoyer de l'eau sur la nappe inférieure (9) du feutre (1) en amont du dispositif centrifugeur (4).Wet circuit according to claim 1 characterized in that it comprises means (12) for sending water onto the lower ply (9) of the felt (1) upstream of the centrifuge device (4). Circuit humide selon l'une des revendications précédentes, caractérisé en ce que le changement de direction de la trajectoire du feutre (1) autour du dispositif centrifugeur (4) est au moins est au moins égal à 270°.Wet circuit according to one of the preceding claims, characterized in that the change in direction of the path of the felt (1) around the centrifuge device (4) is at least is at least 270 °. Circuit humide selon la revendication 3, caractérisé en ce que ledit changement de direction du feutre (1) autour du dispositif centrifugeur (4) est de l'ordre de 300°.Wet circuit according to claim 3, characterized in that said change of direction of the felt (1) around the centrifuge device (4) is of the order of 300 °. Circuit humide selon l'une des revendications précédentes, caractérisé en ce que les cylindres de presse (2) sont pleins.Wet circuit according to one of the preceding claims, characterized in that the press cylinders (2) are full.
EP91100167A 1990-01-09 1991-01-07 Wet circuit of a paper making press with centrifugal dewatering of the press felt Expired - Lifetime EP0437232B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9000162A FR2656881A1 (en) 1990-01-09 1990-01-09 METHOD FOR DEHYDRATING A WET FELT FROM STATIONERY AND WET FELT FOR THE APPLICATION OF SAID METHOD
FR9000162 1990-01-09

Publications (2)

Publication Number Publication Date
EP0437232A1 true EP0437232A1 (en) 1991-07-17
EP0437232B1 EP0437232B1 (en) 1994-06-22

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Application Number Title Priority Date Filing Date
EP91100167A Expired - Lifetime EP0437232B1 (en) 1990-01-09 1991-01-07 Wet circuit of a paper making press with centrifugal dewatering of the press felt

Country Status (9)

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EP (1) EP0437232B1 (en)
AT (1) ATE107718T1 (en)
DE (1) DE69102545T2 (en)
DK (1) DK0437232T3 (en)
ES (1) ES2057605T3 (en)
FI (1) FI910089A (en)
FR (1) FR2656881A1 (en)
NO (1) NO176407C (en)
ZA (1) ZA91180B (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1411500A (en) * 1964-10-14 1965-09-17 Rice Barton Corp Method and device for purging moving felt belts, especially those used in paper machines
US3298904A (en) * 1964-08-10 1967-01-17 Kimberly Clark Co Belt cleaning apparatus for a papermaking machine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3298904A (en) * 1964-08-10 1967-01-17 Kimberly Clark Co Belt cleaning apparatus for a papermaking machine
FR1411500A (en) * 1964-10-14 1965-09-17 Rice Barton Corp Method and device for purging moving felt belts, especially those used in paper machines

Also Published As

Publication number Publication date
NO910050D0 (en) 1991-01-07
FI910089A (en) 1991-07-10
DE69102545D1 (en) 1994-07-28
NO176407B (en) 1994-12-19
DE69102545T2 (en) 1994-10-06
ATE107718T1 (en) 1994-07-15
ES2057605T3 (en) 1994-10-16
ZA91180B (en) 1991-10-30
NO176407C (en) 1995-03-29
EP0437232B1 (en) 1994-06-22
FI910089A0 (en) 1991-01-07
FR2656881A1 (en) 1991-07-12
DK0437232T3 (en) 1994-09-19
NO910050L (en) 1991-07-10

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