EP0958096A1 - Procede et dispositif pour decouper/fermer des bandes - Google Patents

Procede et dispositif pour decouper/fermer des bandes

Info

Publication number
EP0958096A1
EP0958096A1 EP97930665A EP97930665A EP0958096A1 EP 0958096 A1 EP0958096 A1 EP 0958096A1 EP 97930665 A EP97930665 A EP 97930665A EP 97930665 A EP97930665 A EP 97930665A EP 0958096 A1 EP0958096 A1 EP 0958096A1
Authority
EP
European Patent Office
Prior art keywords
web
cut
directing
path
seal
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Withdrawn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
EP97930665A
Other languages
German (de)
English (en)
Inventor
Alan Michael Aindow
Michael John Cahill
Philip Gordon Haddow
Geoffrey William Vernon
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.)
Mpac Group PLC
Original Assignee
Molins Ltd
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 Molins Ltd filed Critical Molins Ltd
Priority to EP97930665A priority Critical patent/EP0958096A1/fr
Publication of EP0958096A1 publication Critical patent/EP0958096A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/08—Devices involving relative movement between laser beam and workpiece
    • B23K26/083—Devices involving movement of the workpiece in at least one axial direction
    • B23K26/0838—Devices involving movement of the workpiece in at least one axial direction by using an endless conveyor belt
    • B23K26/0846—Devices involving movement of the workpiece in at least one axial direction by using an endless conveyor belt for moving elongated workpieces longitudinally, e.g. wire or strip material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
    • B23K26/067—Dividing the beam into multiple beams, e.g. multifocusing
    • B23K26/0676—Dividing the beam into multiple beams, e.g. multifocusing into dependently operating sub-beams, e.g. an array of spots with fixed spatial relationship or for performing simultaneously identical operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/08—Devices involving relative movement between laser beam and workpiece
    • B23K26/082—Scanning systems, i.e. devices involving movement of the laser beam relative to the laser head

Definitions

  • This invention relates to a web cutting and/or sealing method
  • a method of making at a least one cut and/or seal in a travelling web comprises feeding the web at a predetermined (preferably constant) speed, directing a beam of ⁇ o laser radiation along a path towards the moving web, and causing the ⁇ beam to scan relative to web so as to make a cut and/or seal having a i2 predetermined shape in the web, wherein the beam is redirected at i3 spaced positions on said path by means cyclical ly movable about i4 mutually inclined axes so as to cause said scanning of the beam
  • the is beam may be used to make a cut in the web and/or, particularly where i6 the web comprises multiple layers, may be used to make a seal in the i7 web, e.g by causing the layers to bond together
  • the beam could be is arranged, e g by variation of its effective action on the web at adjacent i9 locations on the web, to cut the web at one location and seal it at another
  • the p redete rmin ed shape is
  • At least one cut and/or seal in a travelling web comprises means for 3i feeding the web at a predetermined speed, means for directing a beam
  • the directing means includes first and
  • the first and second elements may thus comprise successive mirrors in the beam path, arranged so that the first element scans the
  • the elements may be control led by cam means synch ronised with
  • the controlling means is preferably arranged to impart cyclic s movement to said directing means, so that a series of said cuts and/or seals of predetermined shape is made in successive portions of the web.
  • the elements are rotatable about ⁇ mutually perpendicular axes, preferably including a first axis parallel to i2 the path of an incident beam of laser radiation and a second axis lying in i a plane parallel to that of the web and transverse to its direction of i movement.
  • the controlling means preferably includes means for redirecting i6 or intercepting the laser beam so that discontinuous cuts and/or seals, i7 e.g. a series of separate circular cuts, may be made in the web.
  • 20 beam may be used to cut and/or seal webs substantially continuously
  • 26 invention is applicable to any i ntense beam of radiation capable of
  • Figure 1 is a plan view of laser web cutting and/or sealing 3i apparatus
  • Figure 3 is a view in the direction of arrow III in Figure 1
  • Figure 4 is a part-sectional view of a first mirror mounting and cam
  • Figure 5 is a part-sectional view of a second mirror mounting of 8 the Figure 1 apparatus
  • Figure 6 is a part-sectional view on the line VI-VI in Figure 5
  • Figure 7 is a view in the direction of arrow VII in Figure 5,
  • Figure 10 shows the paths scanned by the beams, relative to the s moving web in the apparatus of Figure 1
  • o Figure 1 1 is a side view of further laser web cutting and/or sealing ⁇ o apparatus
  • ⁇ Figure 12 shows a detail from the apparatus of Figure 1 1 i2
  • the apparatus will be d escribed in general
  • the apparatus may be used for cutting and /or is sealing depending on the material of the web and the intensity of the i6 beam at the location of the web it is intended to cut and/or seal
  • Figure 1 shows optical apparatus for focusing and scanning an is incident laser beam 2 relative to a moving web 4
  • the beam 2 passes i through a first lens 6 and is brought to an intermediate focus 8 adjacent
  • the disc 10 has a reflective surface facing
  • the disc has a
  • the first oscillating mirror 18 is capable of pivotal movement about
  • the mirror 22 is capable of pivotal 1 movement about a horizontal axis 23 extending parallel to the direction of
  • roller 34 carried by a first arm 36 which, together with a second arm 38
  • a push-rod 40 is connected by way of ball-joints between the outer end of the arm 38 and part of the support structure for the mirror
  • the path 121 A has a start 1 1 0A and end 1 1 A.
  • the beam is active on
  • the cutting path 121 , 121 A is slightly longer than the circumference of the
  • FIG. 6 improves reliability of the joining up of the cut into a closed periphery, and may also compensate for lower power of the beam at the start and s end of the cutting cycle, due to transition of the beam across the leading or trailing edge of the radially outer portion of the switching disc 10.
  • ⁇ o Figure 10 shows the effect of the beam paths 121 , 121 A when ⁇ applied to the moving web 4.
  • the active, or cutting, cycles of the beams i2 on the paths 121 , 121 A describe circles, and cut through the web so that i circular portions of the web may be subsequently removed from the i remainder of the web. is
  • Each rotation of the disc 10 produces two cut-out portions of the i6 web 4: hence the disc 10 rotates at a rate which is half the production
  • Figure 8 shows in plan view drive means for the cams 28, 32 and
  • a spindle 50 is supported for rotation about the
  • the mirror 18 is attached to a member 54 connected for
  • FIG. 35 Figures 5-7 show mounting of the mirror 22.
  • the web 4 consists of a double layer of tea bag paper (the portions of the ⁇ o web to be cut out forming individual tea bags), the laser beam 2 is of ⁇ about 8mm diameter and generated by a laser of 240 watts output i2 power.
  • the diameter of the beam 2 at the disc 10 is about 2mm: this is i3 sufficiently compact to allow switching of the beam by the disc 10 but i not so small that the power intensity damages the reflective surface of is the disc
  • the spot diameter is about 0 18mm i6
  • the system allows a usable depth of focus of about 4mm- this is i sufficient to accommodate the beam path length change as the mirrors is oscillate, which is typically about 2mm.
  • the disc 1 0 and mirrors 1 8, 1 8A and 22, 22A have reflective
  • the apparatus shown in Figure 1 1 is capable of producing a
  • a parallel beam 202 28 single row of circular cut-outs in a moving web 204.
  • first rotary optical unit 206 comprising a first mirror 208, so second mirror 21 0 and focusing lens 21 2
  • the unit 206 is rotatable i about an axis 214 parallel to and aligned with the beam 202 2
  • a focused beam 21 6 is di rected from the lens 21 2 towards a 3 second rotary optical unit 21 8 carrying opposed mirrors 220 and
  • the web 204 lying in the plane of focus of the beam, scans a shape 1 similar to that of the beam path 121 or 121 A in Figure 9.
  • the shape is
  • the beam 202 is switched on and off at times corresponding to positions of the focused beam 224 which themselves correspond to the positions 1 1 0 and 1 1 1 in Figure 9.
  • the beam 202 is switched on and off at times corresponding to positions of the focused beam 224 which themselves correspond to the positions 1 1 0 and 1 1 1 in Figure 9.
  • the unit 21 8 is 9 shown as having two mirrors 220, it preferably has more, typically six, so ⁇ o that the mirrors form a regular polygonal shape around the axis 222.
  • ⁇ Switching of the beam 202 may be performed electrically or i2 mechanically, e.g. by means of a rotating disc 226 ( Figure 12) provided i3 with castellations 228 to intercept the beam, i. e. during periods which
  • the laser beam 202 is required to be switched off or intercepted in the
  • the beam may be redirected to similar apparatus
  • the beam may have a first region or ⁇ part where the beam is of high intensity to cut the web and a second
  • Defocusing of the beam on peripheral ⁇ o regions may be achieved by appropriate selection of beam path, e.g. so ⁇ that the depth of focus is relatively large, and/or by appropriate selection i2 of the final processing element, i.e. lenses 16, 16A or 212.

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Laser Beam Processing (AREA)

Abstract

Un dispositif laser permettant de découper et/ou de fermer, notamment des bandes de papier, comprend un système destiné au balayage d'un faisceau (2, 202) sur une bande qui se déplace (4, 204), de façon à y définir des découpures et/ou des fermetures d'une forme prédéterminée (121, 121A). Le dispositif de balayage comporte un premier et un second miroir (18, 18A, 22, 22A, 206, 208) qui se déplacent de manière cyclique autour d'axes inclinés l'un vers l'autre (19, 19A, 23, 23A, 214, 222). Le dispositif peut comporter deux systèmes de balayage de ce type, définissant des trajectoires séparées en direction de la bande, et un disque de commutation (10) peut diriger le faisceau alternativement selon chaque trajectoire. De cette manière, le faisceau peut être utilisé pour découper et/ou fermer des bandes de manière sensiblement continue, tout en permettant de découper des formes discontinues. Le dispositif peut être utilisé pour découper et/ou fermer des emballages fermés dans une bande contenant des sachets de thé ou d'un autre matériau pouvant infuser.
EP97930665A 1996-07-11 1997-07-10 Procede et dispositif pour decouper/fermer des bandes Withdrawn EP0958096A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP97930665A EP0958096A1 (fr) 1996-07-11 1997-07-10 Procede et dispositif pour decouper/fermer des bandes

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP96305125 1996-07-11
EP96305125 1996-07-11
PCT/GB1997/001855 WO1998002273A1 (fr) 1996-07-11 1997-07-10 Procede et dispositif pour decouper/fermer des bandes
EP97930665A EP0958096A1 (fr) 1996-07-11 1997-07-10 Procede et dispositif pour decouper/fermer des bandes

Publications (1)

Publication Number Publication Date
EP0958096A1 true EP0958096A1 (fr) 1999-11-24

Family

ID=8225006

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97930665A Withdrawn EP0958096A1 (fr) 1996-07-11 1997-07-10 Procede et dispositif pour decouper/fermer des bandes

Country Status (3)

Country Link
EP (1) EP0958096A1 (fr)
AU (1) AU3454197A (fr)
WO (1) WO1998002273A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6284725B1 (en) 1998-10-08 2001-09-04 Bionebraska, Inc. Metabolic intervention with GLP-1 to improve the function of ischemic and reperfused tissue
DE10141404A1 (de) 2001-08-23 2003-03-13 Keuro Besitz Gmbh & Co Bandsäge
DE102011105957A1 (de) * 2011-06-29 2013-01-03 Daimler Ag System zum Schneiden von Folie insbesondere für Membran-Elektronen-Einheiten von Brennstoffzellen
WO2015055221A1 (fr) * 2013-10-15 2015-04-23 Trumpf Laser- Und Systemtechnik Gmbh Optique de traitement au laser, en particulier optique de soudage au laser et dispositif de traitement au laser muni de ladite optique de traitement au laser

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4266112A (en) * 1979-02-14 1981-05-05 Niedermeyer William P Web-cutting process
JPS6044192A (ja) * 1983-08-23 1985-03-09 Univ Nagoya レーザ加工装置
DE3447405A1 (de) * 1984-12-24 1986-07-03 Winkler & Dünnebier, Maschinenfabrik und Eisengießerei GmbH & Co KG, 5450 Neuwied Vorrichtung zum formbrennschneiden einer bewegten materialbahn mittels eines laserstrahls
US4847462A (en) * 1986-11-06 1989-07-11 American Fluoroseal Corporation Method and apparatus for making fluorocarbon film plastic bags using a laser
GB8802689D0 (en) * 1988-02-05 1988-03-02 Atomic Energy Authority Uk Laser scanning system
GB9418692D0 (en) * 1994-09-16 1994-11-02 Premier Brands Uk Improvements relating to cutting assemblies for cutting, for example, tea bags from web material

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9802273A1 *

Also Published As

Publication number Publication date
AU3454197A (en) 1998-02-09
WO1998002273A1 (fr) 1998-01-22

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