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WO1992001835A1 - Procede et appareil servant a stabiliser l'avance d'une bande de papier ou similaire pendant son decoupage en diagonale - Google Patents

Procede et appareil servant a stabiliser l'avance d'une bande de papier ou similaire pendant son decoupage en diagonale Download PDF

Info

Publication number
WO1992001835A1
WO1992001835A1 PCT/FI1991/000226 FI9100226W WO9201835A1 WO 1992001835 A1 WO1992001835 A1 WO 1992001835A1 FI 9100226 W FI9100226 W FI 9100226W WO 9201835 A1 WO9201835 A1 WO 9201835A1
Authority
WO
WIPO (PCT)
Prior art keywords
web
flow
carrier surface
cutting
gaseous medium
Prior art date
Application number
PCT/FI1991/000226
Other languages
English (en)
Inventor
Pekka Hietanen
Original Assignee
Tampella Papertech Oy
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 Tampella Papertech Oy filed Critical Tampella Papertech Oy
Publication of WO1992001835A1 publication Critical patent/WO1992001835A1/fr
Priority to SE9200901A priority Critical patent/SE9200901D0/xx

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G3/00—Doctors
    • D21G3/005—Doctor knifes
    • 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
    • D21F7/04—Paper-break control devices
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0063—Devices for threading a web tail through a paper-making machine

Definitions

  • the present invention relates to a method and apparatus for stabilizing the run of a paper web or the like during diagonal cutting wherein the tail for threading of the web or the like is cut out of the travelling paper web and widened as the cutting member travels in a direction transverse to the web at the free run of the web, for example in a multi-cylinder dryer section, the stabilizing being enhanced by a flow of gaseous medium effected by means of a carrier surface involved with a reduced pressure.
  • Finnish Patent Application No. 880051 proposes a stabilizing member associated with the cutting blade as a new solution, the member being preferably provided with a suction for effecting a flow from the web towards said member. It cannot be denied that this solution has been proved satisfactory in normal runs in the practice. However, under certain circumstances it has been found out that various devices and tubings used in connection therewith may be partly blocked due to the suction principle used in the above-men ⁇ tioned method. Hence, there exists a need for an alternative solution based on a blowing principle, especially in view of such difficult circumstances.
  • the purpose of the invention is to provide an improve ⁇ ment as far as the above-mentioned drawbacks are concerned.
  • the method according to the invention is mainly characterized in that the reduced pressure is created around the cutting member or at least in the area located before the cutting point, seen in the direction of travel of the web, by means of a flow of gaseous medium directed substantial ⁇ ly away from the carrier surface and . the cutting member at least during the cutting operation, said flow being generated by means of a flow brought to the edge of the carrier surface.
  • the device according to the invention is characterized in that the device comprises a nozzle assembly at the edge of the carrier surface for effecting a flow of gaseous medium directed away from the carrier surface and the cutting member with the aid of a flow brought to the edge of the carrier surface with the aid of flow means.
  • the cutting member and the carrier surface associated therewith can be constructed to a compact, easily movable construction.
  • the stabilizing of the paper web can be initiated substantially as early as before the carrier surface and before the associated cutting member because of a nozzle blow that is accomplished before the cutting point, as seen in the direction of travel of the web, and directed opposite to the direction of travel of the paper web.
  • the gaseous medium is most preferably passed to a housing-like construction, wherefro it is passed to the edges of the carrier surface by suitably guiding it.
  • the closed side of the housing construction facing the web can at the same time constitute the well- sealed carrier surface that makes the reduced pressure possible.
  • Fig. 1 shows the location of the apparatus according to the invention in a dryer section
  • Fig. 2 shows a cross-section of an advantageous embodiment in accordance with the inven ⁇ tion
  • Fig. 3 shows the embodiment in accordance with the invention as seen in the direction of the web.
  • Figure 1 shows in side view a part of the rear section of the dryer section of a paper machine, formed by upper cylinders 8 and lower cylinders 9.
  • a web travels in the direction D over the cylinders 8 and 9 along a tortuous path, while it is supported by felts on the cylinders and has a free run between an upper cylinder 8 and a lower cylinder 9 (so-called double guidance) .
  • the felts and the rolls guiding them are not shown herein.
  • a horizontal traversing beam 10 situated perpendicularly to the direction of the travel of the web is mounted in the machine frame.
  • the beam is equipped with a cutting apparatus for the web , mounted movably in the longitudinal direction of the beam.
  • the blade 1 of the apparatus is pivotable into a cutting position where its edge cuts the web .
  • the cutting apparatus is mounted on a carriage travelling in the longitudinal direction of the beam 10, and. as the carriage moves forward and the blade has assumed its cutting position, the web can be widened to a full-width web in the
  • FIGS 2 and 3 show one advantageous compact embodi ⁇ ment of the device in accordance with the invention in schematic sectional and planar views, not showing, for instance, fixing means for mounting the device on the afore-mentioned carriage in more detail.
  • the body of the device is constituted of a housing-like con ⁇ struction 11, in which is mounted a cutting blade 1 and into which a flow of air is led through a chan- nel 5.
  • the wall of the housing facing the web forms thereby a carrier surface 2 with its outer surface, the carrier surface being situated around the cutting point C substantially parallelly to the web.
  • the cutting member 1 is a rotating cutting blade, but it could be also a stationary one.
  • the rotating movement of the cutting blade can be accomplished in the known manner most preferably by means of a driving device driven either by pressurized air or electricity.
  • the cutting blade is shown in its cutting position where the rotating blade 1 cuts the web W with its edge la at a point denoted by letter C and separates the tail Wl for threading from the rest of the web .
  • the blade rotates in a plane perpendicular to the plane of the web W in the direc ⁇ tion A against the direction of travel of the web.
  • a nozzle assembly 3 At the edges of the carrier surface 2 associated with the blade or at least at the edge closest to the cutting edge in the direction of travel of the web or along a part thereof, there is a nozzle assembly 3, the purpose of which is to effect a reduced pressure in the space between the carrier surface 2 surrounding the blade and the web /Wl travelling in this area in order to stabilize the run of the web.
  • the distance of the web to be cut from the blade can be stabilized to a desired value by controlling the nozzle flows which depend in a known manner on the properties of the material to be cut and on the circumstances.
  • the nozzles 3 can be constituted of slits located on the housing 11 at the edges of the carrier surface 2 substantially in a parallel relationship with the plane of the web, that is, of so-called foil nozzles which are so directed that a flow passed through them from the housing 11 creates a fast flow of air which is sufficiently uniform over the direction of width.
  • a suitably shaped row of holes having a similar extension can be used for the same purpose.
  • the flows needed in the embodiment of Figs. 2 and 3 are created by leading an overall flow V of a gaseous medium such as air through one or several flow means 5 from for example a compressor or the like to the inside of the housing-like construction 11 situated at the carrier surface 2.
  • the overall flow is further divided most preferably into partial flows VA, VB, VC, and VD, for example, one for each edge, preferab ⁇ ly for example by means of guiding means 4 formed in the back part 2' of the carrier surface 2.
  • the partial flows pass further through the nozzle assembly 3 and are directed substantially away from the imagined centre point of the carrier surface 2 and from the blade 1, extending almost parallelly with the plane of the web .
  • the air present in the space between the carrier surface 2 and the corresponding area of the opposite travelling web W/Wl, induced by the flows directed away, is sucked with these flows, causing thus the establishment of the reduced pressure within said space.
  • the partial flows VA, VB, VC, and VD are directed from the nozzles 3 situated at the edges of the carrier surface 2 against the direction of travel of the web (VA) starting from the nozzles 3 situated before the cutting point, in the direction of travel of the web (VC) starting from the nozzles 3 situated after the cutting point C, as well as transversely to the direction of travel of the web to both sides away from the cutting point C approximately beside the cutting point starting from the nozzles 3 extending in the direction of travel of the web (VB and VD) .
  • the flow VA is of particular importance, because it prevents the entrance of the air flow entrained with the web into the space between the carrier surface 2 and the web .
  • control and closing means 6 are provided, preferably in association with the guiding means 4 and the nozzle assembly 3.
  • the corresponding closing and control devices 7 also in association with the flow channel 5 feeding the overall flow V divided to separate nozzles. It is thereby possible to make sure that, if for example a part of the nozzle assembly is closed, the inadver ⁇ tent rise in the flow speed in the active nozzles is prevented by choking the overall flow.
  • control of the aforementioned control and closing actions can be integrated in a simple manner in the rest of the process automatics, for example by automatically determining the set values of the control and closing devices on basis of other initial values of the process, for example with the aid of a microprocessor, resulting in the simplest possible use of the device.
  • the cutting is performed by means of a device which is preferably connected by means of an automatically returnable arm mechanism to the carriage travelling along the traversing beam, by transferring said carriage during the cutting operation on the traversing beam to a desired point in the direction of width of the web, the operating devices 6 and 7 being in association with the nozzle assembly 3 and optionally also those in association with the flow means 5 are set to their set values which depend in the known manner on the process conditions, then the device producing the overall flow, such as a compressor, is activated and the rotating function of the cutter blade 1 is started.
  • a device which is preferably connected by means of an automatically returnable arm mechanism to the carriage travelling along the traversing beam, by transferring said carriage during the cutting operation on the traversing beam to a desired point in the direction of width of the web, the operating devices 6 and 7 being in association with the nozzle assembly 3 and optionally also those in association with the flow means 5 are set to their set values which depend in the known manner on the process conditions, then the device producing the overall flow, such as a compressor, is activated and
  • the device is placed with the help of said arm mechanism in contact with the web for cutting it, during which operation it widens the tail l for threading of the web to a full-width web while it moves in the trans ⁇ verse direction B.
  • the arm mechanism of the device in accordance with the invention can be simple, for example a mechanism having two positions, because the controllable nozzle flows help to achieve a reduced pressure and a distance between the carrier surface 2 and the web that are suitable for the conditions.
  • the nozzle assembly can be, for instance, con- stituted of one or several nozzle means known as such which each are provided with independently controllable and closable flows through their respective flow means.
  • the invention is applicable in conjunction with a rotating cutting blade as well as a stationary one.

Landscapes

  • Paper (AREA)
  • Replacement Of Web Rolls (AREA)
  • Advancing Webs (AREA)

Abstract

Pendant le découpage diagonal d'une bande de papier, la queue (W1) d'insertion de la bande (W) est séparée par découpage de la bande et étalée dans toute sa largeur au fur et à mesure que l'élément de découpage (1) se déplace transversalement à la bande au moment du mouvement d'avance libre de la bande de papier, par exemple dans la section contenant le sécheur multicylindre. A la lame de découpage (1) est associée une surface porteuse (2), au bord de laquelle se trouve un ensemble ajutage (3), par lequel s'écoule un flux (VA/VB/VC/VD) d'un milieu gazeux dirigé essentiellement dans des directions opposées au point central imaginaire (2') de la surface porteuse. Le flux de gaz a pour but de stabiliser l'avance de la bande (W) au niveau du point de découpage (C). La surfa e porteuse (2), qui agit dans des conditions de pression réduite en raison des flux de gaz réglables, est reliée par l'intermédiaire d'un ou de plusieurs organes d'écoulement (5) à un dispositif tel qu'un compresseur qui produit le milieu gazeux, lequel est par exemple de l'air.
PCT/FI1991/000226 1990-07-25 1991-07-24 Procede et appareil servant a stabiliser l'avance d'une bande de papier ou similaire pendant son decoupage en diagonale WO1992001835A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SE9200901A SE9200901D0 (sv) 1990-07-25 1992-03-24 Foerfarande och anordning foer stabilisering av loppet av en pappersbana eller dyikt under snedskaerning

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI903723A FI84923C (fi) 1990-07-25 1990-07-25 Foerfarande och anordning foer stabilisering av loppet av en pappersbana eller dylikt vid snedskaerning.
FI903723 1990-07-25

Publications (1)

Publication Number Publication Date
WO1992001835A1 true WO1992001835A1 (fr) 1992-02-06

Family

ID=8530840

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1991/000226 WO1992001835A1 (fr) 1990-07-25 1991-07-24 Procede et appareil servant a stabiliser l'avance d'une bande de papier ou similaire pendant son decoupage en diagonale

Country Status (6)

Country Link
AU (1) AU8198191A (fr)
CA (1) CA2066582A1 (fr)
DE (1) DE4191689T (fr)
FI (1) FI84923C (fr)
SE (1) SE9200901D0 (fr)
WO (1) WO1992001835A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011121390A1 (fr) * 2009-12-02 2011-10-06 Paprima Industries Inc. Dispositif de prolongement pour un caisson de guidage d'air

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE461921B (sv) * 1982-04-27 1990-04-09 Valmet Oy Foerfarande och anordning vid skaerning av ett aendfoeringsband foer en pappersbana

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE461921B (sv) * 1982-04-27 1990-04-09 Valmet Oy Foerfarande och anordning vid skaerning av ett aendfoeringsband foer en pappersbana

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011121390A1 (fr) * 2009-12-02 2011-10-06 Paprima Industries Inc. Dispositif de prolongement pour un caisson de guidage d'air
US10626556B2 (en) 2009-12-02 2020-04-21 Paprima Industries Inc. Extension device for an air guide box

Also Published As

Publication number Publication date
SE9200901L (sv) 1992-03-24
FI903723A0 (fi) 1990-07-25
AU8198191A (en) 1992-02-18
SE9200901D0 (sv) 1992-03-24
CA2066582A1 (fr) 1992-01-26
FI84923C (fi) 1992-02-10
FI84923B (fi) 1991-10-31
FI903723A7 (fi) 1991-10-31
DE4191689T (fr) 1992-08-27

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