EP1520928A1 - Vorrichtung zum Reinigen von Gewebe, insbesondere von Trockengewebe für die Papierindustrie - Google Patents

Vorrichtung zum Reinigen von Gewebe, insbesondere von Trockengewebe für die Papierindustrie Download PDF

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Publication number
EP1520928A1
EP1520928A1 EP04104799A EP04104799A EP1520928A1 EP 1520928 A1 EP1520928 A1 EP 1520928A1 EP 04104799 A EP04104799 A EP 04104799A EP 04104799 A EP04104799 A EP 04104799A EP 1520928 A1 EP1520928 A1 EP 1520928A1
Authority
EP
European Patent Office
Prior art keywords
laser
fabric
cloth
canvas
head
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.)
Withdrawn
Application number
EP04104799A
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English (en)
French (fr)
Inventor
Jacques Malbet
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.)
Papeterie Service Industries
Original Assignee
Papeterie Service Industries
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 Papeterie Service Industries filed Critical Papeterie Service Industries
Publication of EP1520928A1 publication Critical patent/EP1520928A1/de
Withdrawn legal-status Critical Current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
    • D21F1/32—Washing wire-cloths or felts
    • D21F1/325—Washing wire-cloths or felts with reciprocating devices

Definitions

  • the present invention relates to a device for cleaning cloths in particular drying cloths used in the paper industry.
  • Drying cloths are used in the paper industry during paper drying.
  • the paper is made from a grinding of materials such as wood, recycled paper, cardboard, packaging in a large volume of water to form pulp.
  • the dough is then treated to form a continuous sheet which must be dried.
  • the drying is carried out between a permeable fabric and a succession of drying cylinders heated to a temperature of 70 ° C to 180 ° C in a warm atmosphere between 40 and 120 ° C with a humidity of 70 to 100%.
  • the permeable fabric forms a continuous band width of 2 to 10 m for a length of the order of 20 to 70 m and is for example made from an open mesh weave of polymer yarns such as PET.
  • the Web apply the paper to the drying cylinders allowing the water to evaporate through the canvas.
  • the canvas describes a continuous circuit with a speed of scrolling of the order of 100 to 1500 m / min and has a passing strand on the drying cylinders and a return strand.
  • the role of the canvas is not to recover the water or to filter any liquid but to press the paper on the dryer cylinders to help evaporation of the water contained in the paper.
  • pressurized water systems have nozzle nozzles small diameter that tend to clog because of impurities present in water. As a result, frequent interviews are necessary (Change nozzles).
  • the present invention aims at providing a cleaning system in which continuous drying canvases effective, not creating wet waste having tendency to agglomerate, which can be positioned anywhere in the strand back of the canvas, allowing a cleaning and a dry cleaning of the canvas according to a random or programmed movement of the cleaning head.
  • the invention mainly relates to a device for continuous cleaning and unclogging of dry cloths on a drying line for paper, this device comprising an irradiation head laser positioned on a moving frame moving in one direction transverse to the movement of the fabric on the drying line.
  • the laser irradiation head comprises a system focusing optics facing a first end of a waveguide optical, a laser station being connected to the second end of the waveguide optical.
  • the irradiation head is provided with a protective housing closing a space between the optical system of focus and the canvas.
  • the housing may be provided with means of recovery of contaminant residues such as a suction nozzle nearby of the focusing optical system.
  • the mobile frame is arranged on one side of the fabric, a protective bin and waste recovery being arranged on the other side of the canvas opposite the course of movement of the building.
  • the laser is a solid state laser providing pulses of energy.
  • the laser may be a multimode laser.
  • the optical system focuses on the canvas a spot of square section.
  • the device may comprise continuous permeability measuring means and a control system of the head capable of positioning the irradiation head according to measurements of permeability so clean up a succession of areas of the canvas in according to their relative fouling.
  • the mobile frame can be moved back and forth during the moving the canvas so as to clean a succession of surfaces elementary elements aligned along segments inclined relative to the axis of scrolling of the canvas, the canvas being completely scanned at the end of a many turns of rotation of the canvas.
  • This statistical type scan of the canvas with discontinuous spots avoids to burn the canvas by limiting the number of laser shots at a given point or on contiguous points while performing a preventive cleanup that opposes increasing the size of the debris by aggregation.
  • the mobile frame is positioned at near a first dryer cylinder of the drying line.
  • FIG. 1 represents a simplified embodiment of a chain Conventional Drying Plant, to which is added the device according to the invention.
  • the drying battery according to the simplified example comprises several drying cylinders, here 4 cylinders 20a, 20b, 20c, 20d, two continuous webs 1a, 1b, the fabric 1a being pressurized on the drying cylinders 20a, 20c by rollers 23a, 24a, 25a and tensioning devices 26a, 27a of type known, the web 1b being pressurized against the drying cylinders 20b, 20d by rollers 23b, 24b, 25b and tensioning devices 26b, 27b, the sheet of paper 3 to pass between the cloths and the drying cylinders as shown in FIG.
  • the drying cylinders 20a, 20b, 20c, 20d are traditionally heated to a temperature of about 80 ° C to 180 ° C.
  • the device according to the invention comprises a laser irradiation head 4 positioned on a mobile frame 5 moving in a direction D1 perpendicular to the displacement D2 of the canvas 1, 1a, 1b on the drying line.
  • the laser beam generated by the laser station 8 and transported by the guide optical wave 7 to the irradiation head The laser beam generated by the laser station 8 and transported by the guide optical wave 7 to the irradiation head.
  • the post laser 8 comprises a solid state laser such as an ND: YAG laser.
  • Such solid lasers provide short pulses (typically from 1 ns to 100 ⁇ s) with an energy of the order of 5 to 1000 mJ per pulse at a wavelength of the order of 350 to 1,600 nanometers in the different harmonics, these pulses can be emitted at a rate of 1 to 10 kHz.
  • Cleaning mainly uses the mechanical wave effect shock of a plasma formed by the laser pulse on the target.
  • the shock wave applied mechanics is intense enough to vaporize the particles at the surface of the canvas and inlaid debris that clog the canvas.
  • the vapors created will ionize and lead to the formation of a plasma that during its relaxation transmits enough momentum to create a wave shock in the material to take off and volatilize the debris.
  • This phenomenon is particularly present for illuminations greater than 100 MW / cm 2 which can be obtained for pulse durations of the order of ten nanoseconds.
  • An advantage of the device is that the residues of particles and debris being vaporized, they are reduced to such dimensions that they do not redeposit themselves not on the canvas and that a simple suction device can overcome it.
  • Laser cleaning has a limit which is not to burn the canvas. It is therefore necessary to work at a wavelength for which the threshold of damage to the fiber is well beyond the cleaning threshold.
  • a wavelength of the order of 532 nm appears appropriate but can however degrade the fabric quickly in the case of a tight mesh fabric.
  • a wavelength of 1064 nm allows efficient cleaning with fluences of the order of 0.7 to 6 J / cm 2 , without degrading the fabric prematurely.
  • typical values for cleaning using a YAG laser are of the order of 200 mJ for a pulse duration of the order of 25 ns and of the order of 350 mJ pulses duration of the 8 to 12 ns, for a wavelength of 1064 nm and a rate of the order of 1 to 200 Hz, the cleaning resulting from a law based on energy / cadence torques or power / duration adapted to the Web.
  • the laser spot for cleaning optimum must be wide enough to cover the debris.
  • the optical system 6 focuses on the canvas a spot of square section.
  • a multimode laser will be preferred because of the more great homogeneity of the spot obtained.
  • a disc-shaped focus can be used provided that a homogeneous energy distribution is maintained and non-Gaussian, this last distribution is not the most appropriate since it concentrates the energy in the center of the generated spot or spot.
  • the spots can realize on the canvas a succession points aligned in segments inclined to the scroll axis some cobweb. According to the principle of the invention it appeared that it is not necessary to clean the canvas on continuous segments but that spot cleaning same discontinuous is opposed to the aggregation of debris by limiting their size and provides effective declogging of the fabric.
  • a housing 9 of protection of the head 4 closes a space between the focusing optical system 6 and the fabric 1.
  • This housing can have walls of highly resistant plastic material such as the one known under the brand VITON and come into contact with the canvas.
  • the 9 and / or the head are provided with a suction nozzle 11 near the optical system 6 or other means 10 of residue recovery contaminating or otherwise blowing on the optical system 6.
  • a tray 12 of protection and waste recovery is arranged opposite the route of displacement of the frame.
  • the moving frame and the laser are controlled by control devices 8, 21, 22.
  • the device 21 according to the example controls the movements of the frame through the motor 22.
  • the control device causes the casting to execute movements of va and comes during the moving of the canvas 1 so clean up a succession of segments 13, 13 'inclined relative to the scroll axis D2 of the fabric.
  • these segments are a succession of points more or less close together depending on the periodicity of the laser shots, the speed of movement of the canvas and the speed of movement of the frame.
  • Cleaning and unclogging is a kind of cleaning statistical; the canvas being completely swept after a multitude of turns rotation while scrolling.
  • the invention thus allows a preventive cleaning of the fabric. Due to sweeping, the canvas can maintain a global cleanliness avoiding the constitution accumulation of debris.
  • the control system can be adjusted to avoid a coupling effect period for which the speed of movement of the fabric and the frequency of back and forth from the cart would lead to sweeping only a given band of the canvas. For this, the control system can play first and foremost on the speed of displacement of the frame, the scrolling speed of the canvas being dependent on it the drying efficiency to obtain.
  • the device can comprise means 50 continuous permeability measurement of the fabric.
  • These means can be constituted by a suction device 51 coupled to a sensor 52 of depression measuring the amount of air that can be evacuated through the canvas.
  • the device can move transversely with respect to the canvas, the vacuum sensor being connected to the control system.
  • the system 21, 22 for controlling the irradiation head 4 can in this case case be programmed to be able to position the head according to permeability measurements so clean up a succession of areas of the canvas according to their relative fouling. Such a solution may allow to insist on a heavily fouled area and to move quickly on unclogged areas.
  • mobile frames 5a, 5b can be positioned anywhere on the strands of back of the canvas and in particular may be arranged near a first dryer cylinder 20a, 20b of the dryer battery.
  • the same laser can, using a beam splitting device of the type known, serve as a light source for two mounted irradiation heads each on a frame 5a, 5b so as to clean two paintings simultaneously.
  • the frame 5 or the mobile frames 5a, 5b moving in a direction D1 transverse to the displacement D2 of the fabric 1, 1a, 1b on the battery of driers can without departing from the scope of the invention move according to a direction perpendicular to the direction of movement of the canvas or at an angle not zero with respect to this direction D2 of displacement according to positioning constraints of the support 30 on which the frame moves.

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  • Paper (AREA)
EP04104799A 2003-10-01 2004-09-30 Vorrichtung zum Reinigen von Gewebe, insbesondere von Trockengewebe für die Papierindustrie Withdrawn EP1520928A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0311504A FR2860526B1 (fr) 2003-10-01 2003-10-01 Dispositif de nettoyage de toiles notamment de toiles de secherie utilisees dans l'industrie papetiere
FR0311504 2003-10-01

Publications (1)

Publication Number Publication Date
EP1520928A1 true EP1520928A1 (de) 2005-04-06

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP04104799A Withdrawn EP1520928A1 (de) 2003-10-01 2004-09-30 Vorrichtung zum Reinigen von Gewebe, insbesondere von Trockengewebe für die Papierindustrie

Country Status (2)

Country Link
EP (1) EP1520928A1 (de)
FR (1) FR2860526B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2383387A1 (de) * 2010-04-28 2011-11-02 Swen Müller Verfahren zur Reinigung einer umlaufenden Gewebebahn in einer Papier- oder Kartonmaschine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5783044A (en) * 1995-02-24 1998-07-21 Voith Sulzer Papiermaschinen Gmbh Belt cleaning device for papermaking machines
WO2002020901A1 (en) * 2000-09-06 2002-03-14 Metso Paper, Inc. Method and equipment for cleaning and maintaining rolls

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5783044A (en) * 1995-02-24 1998-07-21 Voith Sulzer Papiermaschinen Gmbh Belt cleaning device for papermaking machines
WO2002020901A1 (en) * 2000-09-06 2002-03-14 Metso Paper, Inc. Method and equipment for cleaning and maintaining rolls

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2383387A1 (de) * 2010-04-28 2011-11-02 Swen Müller Verfahren zur Reinigung einer umlaufenden Gewebebahn in einer Papier- oder Kartonmaschine
DE102010028309A1 (de) * 2010-04-28 2011-11-03 Swen Müller Siebband für eine Papier- oder Kartonmaschine
DE102010028309B4 (de) * 2010-04-28 2011-12-08 Swen Müller Siebband für eine Papier- oder Kartonmaschine

Also Published As

Publication number Publication date
FR2860526B1 (fr) 2006-09-29
FR2860526A1 (fr) 2005-04-08

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