EP0064933B1 - Presse à pinçage prolongé - Google Patents

Presse à pinçage prolongé Download PDF

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Publication number
EP0064933B1
EP0064933B1 EP82630035A EP82630035A EP0064933B1 EP 0064933 B1 EP0064933 B1 EP 0064933B1 EP 82630035 A EP82630035 A EP 82630035A EP 82630035 A EP82630035 A EP 82630035A EP 0064933 B1 EP0064933 B1 EP 0064933B1
Authority
EP
European Patent Office
Prior art keywords
belt
pressing
web
shoe
nip
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
Application number
EP82630035A
Other languages
German (de)
English (en)
Other versions
EP0064933A1 (fr
Inventor
Edgar J. Justus
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.)
Beloit Corp
Original Assignee
Beloit Corp
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
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Application filed by Beloit Corp filed Critical Beloit Corp
Publication of EP0064933A1 publication Critical patent/EP0064933A1/fr
Application granted granted Critical
Publication of EP0064933B1 publication Critical patent/EP0064933B1/fr
Expired 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
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • 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
    • D21F3/0209—Wet presses with extended press nip
    • D21F3/0218—Shoe presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B9/00—Presses specially adapted for particular purposes
    • B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
    • B30B9/24—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using an endless pressing band

Definitions

  • the invention relates to a press mechanism for removing water from a traveling fibrous web according to the pre-characterizing portion of claim 1.
  • a press mechanism for removing water from a traveling fibrous web according to the pre-characterizing portion of claim 1 is known from US-A-4 201 624.
  • the looped belt of the press mechanism disclosed therein is wrapped over belt guide rolls which are located inside the loop defined by the belt and can be driven. If a driving force is applied to the belt guide rolls, the inner surface of the looped belt, which slides over the respective pressing shoe in operation of the press mechanism, may be subject to abrasion which tends to increase friction between the belt and the respective pressing shoe. Increased friction between the belt and the respective pressing shoe, however, is undesirable.
  • the known press mechanism utilizes a doctor for removing moisture from the outer surface of the looped belt upstream of the nip.
  • Use of a doctor is disadvantageous in that it may cause abrasion of the looped belt.
  • a press mechanism of the kind defined in the pre-characterizing portion of claim 1 is also known from US-A-3 783 097 (Re. 30 268).
  • a separate drive for the belt may be employed in that press mechanism to drive it at substantially the speed of the outer surface of a backing roll.
  • there is no indication in this prior patent publication as to the location of the belt drive means in relation to the belt.
  • a press mechanism similar to that defined in the pre-characterizing portion of claim 1 but without a drive means for the belt is disclosed in each of US-A-3 748 225 and GB-A-2 057 027.
  • the belt will travel only as a result of its contact with a moving felt used for receiving water pressed from the web.
  • An object of the invention is to provide a press mechanism of the kind defined in the pre-characterizing portion of claim 1, in which the drive means are so arranged that the sliding surface of the belt is not subject to any abrasion caused by the drive, and in which traction and guidance of the belt as well as the removal of moisture from the outer surface of the belt are improved.
  • the main advantage of the press mechanism according to the invention is that it provides for an improved treatment of the web in the press nip.
  • the press mechanism according to the invention accommodates relatively high speed travel of a paper web and the application of a pressing force which is controlled to optimum nip pressure for the type of paper being manufactured.
  • the press mechanism according to the invention is relatively uncomplicated and capable of continued operation over a long period of time without requiring servicing or adjustment or significant attention that would require stopping the machine.
  • uniform pressing, pressure across the width of the travelling web T or more uniform water removal can be obtained by the press mechanism according to the invention.
  • An advantage of the press mechanism according to the invention also lies in that it improves the quality of the sheet, improves moisture removal, performs a better pressing operation and reduces rewetting.
  • figure 1 is a somewhat schematic side elevational view of a press section of a papermaking machine embodying the structure and principles of the present invention.
  • a nip N for pressing and dewatering a web is formed between first and second shoes 10 and 11.
  • the shoes have a relieved leading edge shown at 12 and 13 leading to a pressing face 14 and 15.
  • the pressing faces each face the extended nip and are smooth and essentially straight so that they apply a pressing pressure to the web W during the time it is passing through the nip.
  • the shoes extend laterally across the web for slightly longer than the web width, and can be referred to as being elongate in the direction transverse of the web travel as indicated by the directional arrow on the web.
  • the web is sandwiched between felts 18 and 19 which provide means for receiving water pressed from the web, and the felts and web are carried through the nip sandwiched between looped endless impervious belts 16 and 17.
  • the looped belts 16 and 17 are made of extremely strong reinforced rubber or similar material, and are driven at the speed of travel of the web so that they carry the web and felts through the nip, and the belts are tensioned on guide rolls shown for the belt 16 at 16a, 16b, 16c and 16d.
  • Roll 16c may be a tension roll movable in the direction of the arrowed lines by suitable tensioning mechanism.
  • the lower belt 17 is guided by similar tensioning rolls 17a, 17b, 17c and 17d, and suitable mechanism is provided for the tension roll 17c to move it in the direction of the arrowed lines for maintaining the desired tension in the belt 17.
  • An important feature for proper treatment of the web is the means of driving the belts, each of which is wrapped over a grooved traction and guide rolls 20 and 22 for the belts 16 and 17 respectively.
  • the belt is wrapped over these rolls for an arc preferably in excess of 90°, and it has been found that an improved tracking and driving relationship is attained by providing uniform circumferential grooves in the surface of the roll with the grooves shown schematically by the broken lines 21 and 23 for the rolls 20 and 22 respectively.
  • These grooves are annular recesses cut at uniform intervals along the surface of the roll leaving flat land areas therebetween.
  • the grooved traction rolls 20 and 22 engage the outer surface of the belt, which is the surface that is adjacent the felts in the nip. Thus, no driving or traction forces are applied to the inner surface of the belts which surfaces slide over the shoes 10 and 11. Any abrasion caused by the drive is not directed at the sliding surface of the belt. Further, it is to be noted that it is the outer surface of the belt which will be wet from its contact with the felt so that this wetness on the belt surface has been found to be accommodated by the unique grooved traction rolls 20 and 22.
  • a film of lubricating fluid is continuously developed between the flat surfaces 14 and 15 of the shoes and the belts due to the fact that their leading edges 12 and 13 are relieved and a continuous supply of lubricant is delivered at the location of these relieved edges by jets 24 and 25.
  • the lubricant may be of various substances, such as oil, and is applied in a manner so that each of the shoes acts as a slipper bearing and actually while the shoes press toward each other, the film of lubricating liquid is continuous so that there is a hydraulic transmission of the force of the shoe to the belt through the lubricant.
  • the shoes Because of the hydraulic reaction against the shoe due to the lubricant layer between the shoe and belt, the shoes will tend to tilt to a neutral position. That is, the shoes are each shown as mounted on a central pivot 27 and 29. These pivots are located approximately midway between the front and back edges of the shoe, and the shoes will operate at a balanced position wherein the hydraulic forces of the lubricant ahead of the pivot are the same as the hydraulic forces behind the pivot.
  • Edge seals may be provided at the edges of the belt to prevent lubricant from migrating around the edge of the belt, but experience has shown that the amount of lubricant passing around the edge of the belt is minimal so that edge seals are not absolutely essential.
  • the trailing edge of the shoes are rounded slightly at 10a and 11 a to reduce the concentration of pressure against the belt as the belts emerge from the trailing edges of the shoes. While each shoe is pivotally mounted by a pivot pin which extends laterally across the entire width of the machine so that the shoe is pivotally supported about its lateral axis, in some instances, it may be desired to pivotally mount only one of the shoes. This will still achieve the hydraulic balance in the nip inasmuch as the one pivoted shoe will pivot to a neutral position with hydraulic forces ahead of and behind the pivot being uniform.
  • the shoes are supported on opposed heavy beams 26 and 28 above and below the shoes 10 and 11.
  • the pivot pin 27 may be omitted in some instances, and the shoe 10 mounted rigidly on the beam 26, and only the pivot pin 29 provided. This is an alternate structure, but the pivotal support for each of the shoes is preferred.
  • the pivot pins can be so located relative to the leading and trailing edge of the shoe so that uniform pressure occurs throughout the length of the extended nip or may be set slightly downstream in the direction of the web movement so that a slightly lower unit nip pressure occurs ahead of the pin than after the pivot pin.
  • the shoes will assume a position of balance wherein the total hydraulic forces of the lubricant in the nip ahead of the pivot pin equal those behind the pivot pin.
  • the lower shoe is mounted on a piston 30 seated in a cylinder 31.
  • Hydraulic liquid is delivered to the piston beneath the cylinder by suitable means indicated by the line 32.
  • the cylinder or channel 31 beneath the piston is preferably continuous, or if separated, the same pressure is applied to each of the chambers so that the upward force on the shoe is uniform throughout its length across the machine. If the cylinder or chamber 31 is continuous, since the hydraulic fluid will be at the same pressure throughout the continuous cylinder 31, a uniform upward force will be applied to the shoe throughout its length insuring that the pressing force in the nip will be uniform across the machine.
  • the upper beam 26 may bow upwardly slightly in its middle, but the shoes 10 and 11 are sufficiently limber so that they will bow with the beam without introducing any significant forces due to their resistance to bending, and thus the uniform pressure in the nip will not be altered.
  • the piston will bow slightly to conform to the bending of the upper beam 26, but the amount of curvature due to this bowing will be insignificant and will not affect the uniformity of pressure in the nip across the machine. If the lower beam 28 bows downwardly, this shape will not be transmitted to the shoes because the sole upward force on the piston is derived from the force of the hydraulic liquid in the cylinder 31 beneath the piston.
  • the upper shoe may be desirable to support the upper shoe on a piston and cylinder arrangement similar to the piston and cylinder 30 and 31 so that a force is applied both to the upper shoe and to the lower shoe.
  • the lower shoe may be supported directly on a beam on a pivot pin without a piston and cylinder, and the piston and cylinder be provided for the upper beam and upper shoe. If a single piston and cylinder is used, it is preferred that it be used on the lower beam 28, because the weight of the upper beam 26 tends to counteract the upward reaction force from the shoe 10 applying pressure to the nip.
  • the two belts 16 and 17 are driven at the speed of travel of the web due to their frictional tracking engagement with their driving rolls 20 and 22.
  • the felts 18 and 19 are carried through the nip with the web between them, and as water is pressed from the web from the time it enters the nip N at the leading edge of the shoes 10 and 11 to where it leaves the shoes, it is received by the felts which are dried in the usual manner.
  • Control of the pressure in the nip is obtained by the pressure of the hydraulic fluid delivered through the line 32 to the cylinder chamber 31.
  • the shoes can be held in loose engagement with the belts at start-up and pressure increased as the machine reaches operating speed, and the pressure adjusted in accordance with the desired operation and the amount of water to be pressed from the web in the extended nip.
  • the driving rolls drive the belts at uniform speed maintaining constant and uniform traction despite any water which remains on the surface of the belts. It is to be understood that the advantages of the unique driving rolls may be employed in other forms of extended nip presses, such as, for example, structures such as shown in Re 30,268 by forcing a grooved driving roll into driving contact with the outer surface of the belt.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)

Claims (11)

1. Mécanisme de presse pour enlever de l'eau à partir d'une nappe fibreuse défilant (W), comprenant une zone de pressage étendue et allongée (N) formée entre un premier patin de pressage fixe (10) et un élément de pressage opposé qui présentent tous les deux des faces de pressage allongées tournées vers la zone de pressage (N), pour appliquer une force de pressage à la nappe fibreuse défilant qui se déplace à travers la zone de pressage (N), des moyens prévus dans cette zone de pressage (N) pour recevoir l'eau exprimée à partir de la nappe (W), une première courroie sans fin mobile (16) passant à travers la zone de pressage (N) entre le premier patin de pressage fixe (10) et les moyens recevant l'eau, des moyens (24) pour fournir un fluide entre le patin de pressage (10) et la courroie (16), de manière à établir ainsi une pression de fluide hydraulique entre le patin de pressage (10) et la courroie (16), des rouleaux de guidage (16a-16d) disposés dans la boucle définie par la courroie (16), et un dispositif d'entraînement de cette courroie (16), caractérisé en ce que le dispositif d'entraînement comprend un rouleau d'entraînement (20) disposé à l'extérieur de la boucle définie par la courroie (16) et en contact avec la surface externe de cette courroie, ce rouleau d'entraînement (20) ayant des gorges circonférentielles (21) pour la traction et le guidage de la courroie.
2. Mécanisme de presse pour enlever de l'eau à partir d'une nappe fibreuse défilant suivant la revendication 1 caractérisé en ce que l'élément de pressage opposé comprend un second patin de pressage allongé (11), une seconde courroie sans fin mobile (17) passe à travers la zone de pressage (N), les deux courroies (16, 17) prenant en sandwich entre elles la nappe et les moyens recevant l'eau, des moyens (25) sont prévus pour fournir un fluide entre le second patin de pressage allongé (11) et la seconde courroie sans fin mobile (17), de manière à créer une pression de fluide hydraulique entre le second patin de pressage (11) et la seconde courroie sans fin (17), des rouleaux de guidage (17a-17d) sont disposés dans la boucle définie par la seconde courroie (17), et un dispositif d'entraînement est prévu pour la seconde courroie (17), ce dispositif d'entraînement comprenant un second rouleau d'entraînement (22) disposé à l'extérieur de la boucle définie par la seconde courroie (17), ce second rouleau d'entraînement (22) ayant des gorges circonférentielles (23) pour la traction et le guidage de la seconde courroie (17).
3. Mécanisme de presse pour enlever de l'eau à partir d'une nappe fibreuse défilant suivant l'une quelconque des revendications 1 ou 2 caractérisé en ce que chaque courroie (16, 17) est en contact avec le rouleau d'entraînement en traction associé (20, 22) le long d'un arc supérieur à 90°.
4. Mécanisme de presse pour enlever de l'eau à partie d'une nappe fibreuse défilant suivant la revendication 2 caractérisé en ce que chacun des premier et second patins de pressage (10, 11) comprend un bord avant dégagé (12, 13), et chaque moyen (24, 25) prévu pour fournir du fluide entre les patins de pressage (10, 11) et les courroies respectives (16, 17) est disposé de manière à fournir le fluide vers le bord avant dégagé (12, 13) de chacun des patins de pressage (10, 11).
5. Mécanisme de presse pour enlever de l'eau à partie d'une nappe fibreuse défilant suivant la revendication 2 caractérisé en ce que des moyens sont prévus pour supporter l'un au moins des patins de pressage (10, 11) de manière à lui permettre un mouvement de pivotement autour d'un axe transversal par rapport à la direction de défilement de la nappe.
6. Mécanisme de presse pour enlever de l'eau à partie d'une nappe fibreuse défilant suivant la revendication 2 caractérisé en ce que les deux patins (10, 11) sont montés à pivotement autour d'axes transversaux par rapport à la direction du défilement de la nappe.
7. Mécanisme de presse pour enlever de l'eau à partie d'une nappe fibreuse défilant suivant l'une quelconque des revendications 2 ou 4 caractérisé en ce que des moyens sont prévus pour appliquer une force de pressage à l'un au moins des patins (10, 11).
8. Mécanisme de presse pour enlever de l'eau à partie d'une nappe fibreuse défilant suivant l'une quelconque des revendications 2 ou 4 caractérisé en ce que des moyens sont prévus pour appliquer une force de pressage aux deux patins (10, 11).
9. Mécanisme de presse pour enlever de l'eau à partie d'une nappe fibreuse défilant suivant l'une quelconque des revendications 7 ou 8 caractérisé en ce que les moyens appliquant la force de pressage comportent un support à fluide s'étendant transversalement, lequel applique, au patin associé (10, 11), une force qui est uniforme le long du patin dans le sens transversal par rapport à la direction du défilement de la nappe, si bien qu'une force uniforme est appliquée à cette nappe (W) en travers de la zone de pressage (N).
10. Mécanisme de presse pour enlever de l'eau à partir d'une nappe fibreuse défilant suivant la revendication 9 caractérisé en ce que le support à fluide est réalisé sous la forme d'un piston (30) et d'un cylindre (31) qui est porté par un support relativement rigide (28), et le piston (30) est supporté dans le cylindre par un liquide sous pression et il supporte le patin (11) sur un pivot (29) s'étendant transversalement par rapport à la direction du défilement de la nappe.
11. Mécanisme de presse pour enlever de l'eau à partir d'une nappe fibreuse défilant suivant la revendication 2 caractérisé en ce que les moyens recevant l'eau sont réalisés sous la forme de premier et second feutres (18, 19) montés adjacents aux courroies mobiles (16,17) avec la nappe (W) prise en sandwich entre ces feutres.
EP82630035A 1981-04-30 1982-04-30 Presse à pinçage prolongé Expired EP0064933B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US25893281A 1981-04-30 1981-04-30
US258932 1981-04-30

Publications (2)

Publication Number Publication Date
EP0064933A1 EP0064933A1 (fr) 1982-11-17
EP0064933B1 true EP0064933B1 (fr) 1986-10-15

Family

ID=22982744

Family Applications (1)

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EP82630035A Expired EP0064933B1 (fr) 1981-04-30 1982-04-30 Presse à pinçage prolongé

Country Status (10)

Country Link
EP (1) EP0064933B1 (fr)
JP (1) JPS5930836B2 (fr)
KR (1) KR860001618B1 (fr)
AR (1) AR226644A1 (fr)
BR (1) BR8202582A (fr)
CA (1) CA1181975A (fr)
DE (1) DE3273815D1 (fr)
ES (1) ES8304243A1 (fr)
FI (1) FI820642L (fr)
IN (1) IN156378B (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3704090A1 (de) * 1986-02-12 1987-08-13 Valmet Oy Verfahren zur stabilisierung der gleitschuhe einer zonengeregelten walze sowie eine das verfahren anwendende walze sowie deren hydrodynamischer oder hydrostatischer gleitschuh
DE19644108A1 (de) * 1996-10-31 1998-05-07 Voith Sulzer Papiermasch Gmbh Schuhpresse
DE19723172A1 (de) * 1997-06-03 1998-12-10 Geldmacher Joachim Preßvorrichtung
DE10054674A1 (de) * 2000-11-03 2002-05-08 Voith Paper Patent Gmbh Schuhpresse
DE10132652A1 (de) * 2001-07-05 2003-01-16 Voith Paper Patent Gmbh Pressenanordnung
US8178045B2 (en) 2007-12-17 2012-05-15 University Of Louisville Research Foundation, Inc. Interchangeable preconcentrator connector assembly
US8448532B2 (en) 2009-03-18 2013-05-28 The United States Of America As Represented By The Secretary Of The Navy Actively cooled vapor preconcentrator

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0194240U (fr) * 1987-12-16 1989-06-21
DE29622025U1 (de) * 1996-10-16 1997-03-27 Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim Preßvorrichtung
EP1205600A1 (fr) * 2000-11-03 2002-05-15 Voith Paper Patent GmbH Presse à patin

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE30268E (en) * 1972-05-30 1980-05-06 Beloit Corporation Hydrodynamically loaded web press with slipper bearing shoes

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US38092A (en) * 1863-04-07 Improved stump-pulling machine
US3748225A (en) * 1970-11-19 1973-07-24 Beloit Corp Fibrous web press nip structure including nonporous belts backed by pistons supported with fluid pressure
US4287021A (en) * 1979-08-27 1981-09-01 Beloit Corporation Extended nip press

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE30268E (en) * 1972-05-30 1980-05-06 Beloit Corporation Hydrodynamically loaded web press with slipper bearing shoes

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3704090A1 (de) * 1986-02-12 1987-08-13 Valmet Oy Verfahren zur stabilisierung der gleitschuhe einer zonengeregelten walze sowie eine das verfahren anwendende walze sowie deren hydrodynamischer oder hydrostatischer gleitschuh
DE19644108A1 (de) * 1996-10-31 1998-05-07 Voith Sulzer Papiermasch Gmbh Schuhpresse
DE19723172A1 (de) * 1997-06-03 1998-12-10 Geldmacher Joachim Preßvorrichtung
DE10054674A1 (de) * 2000-11-03 2002-05-08 Voith Paper Patent Gmbh Schuhpresse
DE10132652A1 (de) * 2001-07-05 2003-01-16 Voith Paper Patent Gmbh Pressenanordnung
US8178045B2 (en) 2007-12-17 2012-05-15 University Of Louisville Research Foundation, Inc. Interchangeable preconcentrator connector assembly
US8448532B2 (en) 2009-03-18 2013-05-28 The United States Of America As Represented By The Secretary Of The Navy Actively cooled vapor preconcentrator

Also Published As

Publication number Publication date
ES511807A0 (es) 1983-03-01
BR8202582A (pt) 1983-04-19
ES8304243A1 (es) 1983-03-01
CA1181975A (fr) 1985-02-05
IN156378B (fr) 1985-07-06
KR860001618B1 (ko) 1986-10-14
FI820642L (fi) 1982-10-31
EP0064933A1 (fr) 1982-11-17
JPS57183491A (en) 1982-11-11
JPS5930836B2 (ja) 1984-07-28
KR830010247A (ko) 1983-12-30
DE3273815D1 (en) 1986-11-20
AR226644A1 (es) 1982-07-30

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