WO2006063609A1 - Device for perforating a flexible film - Google Patents

Device for perforating a flexible film Download PDF

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Publication number
WO2006063609A1
WO2006063609A1 PCT/EP2004/014375 EP2004014375W WO2006063609A1 WO 2006063609 A1 WO2006063609 A1 WO 2006063609A1 EP 2004014375 W EP2004014375 W EP 2004014375W WO 2006063609 A1 WO2006063609 A1 WO 2006063609A1
Authority
WO
WIPO (PCT)
Prior art keywords
laser beam
signal
film
generator
flexible film
Prior art date
Application number
PCT/EP2004/014375
Other languages
French (fr)
Inventor
Bas R. A. Groeneweg
Wilhelm Gerbrand De Ruiter
Original Assignee
Perfo Tec Bv
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 Perfo Tec Bv filed Critical Perfo Tec Bv
Priority to PCT/EP2004/014375 priority Critical patent/WO2006063609A1/en
Publication of WO2006063609A1 publication Critical patent/WO2006063609A1/en

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
    • B23K26/14—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor
    • B23K26/142—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor for the removal of by-products
    • 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
    • B23K26/03—Observing, e.g. monitoring, the workpiece
    • 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
    • B23K26/03—Observing, e.g. monitoring, the workpiece
    • B23K26/032—Observing, e.g. monitoring, the workpiece using optical means
    • 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
    • B23K26/12—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure
    • B23K26/123—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure in an atmosphere of particular gases
    • 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
    • B23K26/36—Removing material
    • B23K26/38—Removing material by boring or cutting
    • B23K26/382—Removing material by boring or cutting by boring
    • 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
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/30—Organic material
    • B23K2103/42—Plastics
    • 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
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/50—Inorganic material, e.g. metals, not provided for in B23K2103/02 – B23K2103/26

Definitions

  • the invention relates to a device for perforating a flexible film by means of a laser beam, comprising a laser beam generator, transport means for transporting the film through the laser beam and means for focussing the laser beam on the film surface.
  • the object of the invention is to provide a device according to the preamble of claim 1 , in which this problem and other problems have been solved.
  • This object is obtained in that a detector is positioned along the path of movement of the flexible film for detecting whether the perforation has been made in the correct way.
  • the laser perforating device comprises a first house 10, preferably with a cylindrical cross section having one end wall 11 oriented towards the film 1 and provided with an opening 12 with circular cross section.
  • the cylindrical portion of the house 10 is provided with an internal screw thread 12 and a holding plate 17 provided with external screw thread is screwed into the housing 10.
  • the holding plate is provided with a bore 13 in which a laser beam generating device 14 is fixed to the plate 17. This is done in such a way that the laser beam generated by the device 14 is aligned with the opening 12 in the end wall 11.
  • the laser beam generating device 14 is provided with optical focussing means allowing the focussing of the beam at a defined place in order to concentrate the energy.
  • optical focussing means allowing the focussing of the beam at a defined place in order to concentrate the energy.
  • the plate 12 is also provided with an opening 15 which through a house 16 is connected to a source of pressurized air or another gas. Through this system it is possible to introduce pressurized air in the house 10, which air will leave the T/EP2004/014375
  • the latter In view of the relative position of the transport system (or the position of the reels 2 and 3) of the film, the latter is slightly curved along the end wall 11 , but will not be in contact therewith because of this air cushion. In this way damage to the film surface can be avoided. Moreover the pressurized air will prevent dust from entering the chamber 18 formed by the housing 11 and the plate 12, thereby avoiding contamination of the laser beam generating system, which contamination can influence the power of the laser beam. Moreover, the wear and tear of the external surface of the end wall 11 is reduced.
  • the air of gas used is a dust-free dry gas.
  • a second comparable housing 20 having an end wall 21 provided with an opening 22 which is aligned with the laser beam.
  • the housing 20 is provided with an internal screw thread and a holding plate 27 provided with a threaded portion is mounted to the housing 21 to close the other end.
  • the whole construction might be identical to the construction of the laser housing or it might also be different.
  • the plate 27 is provided with an opening 23 in which there is mounted a photo-electric sensor 24 which is especially sensitive to the laser beam wave length(s). This sensor 24 is also aligned to the laser beam generated by the device 14.
  • the sensor 24 is provided with focussing means in order to adjust the measuring point of the sensor. By means of the screw connection between the housing 20 and the plate 27 it is possible to adjust the sensor 24 in such a way that its focussing point is exactly positioned in the plane of the film passing along the plate 21.
  • an opening 25 which is connected to a hose 26 which otherwise is connected to an air suction device, e.g. a fan or the like. In this way air is suctioned through the split between the wall 21 and the film 1 , into 75
  • the laser beam generating device 14 and the sensor 24 are provided with the required electrical connections, in order to perform the functions as described below.
  • the sensor 24 is connected to a control unit which compares the output signal of the sensor with a set threshold value. This set value is such that it is an indication of whether the film has been perforated in the right way or not. From the relative position of the different components it is obvious that the light intensity measured by the sensor 24 is dependent upon the existence of a perforation or hole in the film. As long as no perforation has been made the measured intensity is relatively low due to the light diffusion by the film. As soon as the perforation has been made, this light intensity will increase substantially and this difference can easily be measured by the sensor and the control system.
  • the laser beam generator device 14 is activated intermittently so that at regular internals perforations are made in the film 1 while the same is moving along the opening 1.
  • a signal is transmitted to the control unit of the sensor in order to compare the sensor signal with the set threshold value in order to detect whether the perforation has been made.
  • the control unit can further be designed in such a way that either each failure is signalled, or a warning signal is generated each time a defined number of failures has occurred, or a warning signal is generated each time a preset number of failures has occurred compared to a preset number of perforations to be made.
  • a part of the laser beam generated by the generator 14 is directed directly to a sensor provided within the housing 10.
  • the signal generated by this sensor is transmitted to the control unit of the sensor 24 and used as a reference signal for comparison with the signal of the sensor 24.
  • the generation of a warning signal can be made independent of the change in output of the laser beam generating device 14, which can be due to contamination or ageing.
  • the second sensor signal can be used as a warning signal for detecting that the intensity of the laser beam has decreased to below a preset value and the generator 14 needs revision or replacement.
  • the detection device for detecting the quality of the perforation is made independent of the perforating device itself.
  • a separate device may be positioned downstream with respect to the lower preferably device.
  • such a device can consists of a source signal generator, i.e. a device generating a permanent of intermittent signal which will be altered by the presence of a perforation. Intermittently means that the source signal is at least generated each time it is accepted that a perforation will pass along the device. Otherwise it comprises a recording device which register the signal or the modified signal and which is able to make a distinction between the presence of absence of a perforation.
  • a source signal generator i.e. a device generating a permanent of intermittent signal which will be altered by the presence of a perforation.
  • the source signal is at least generated each time it is accepted that a perforation will pass along the device.
  • it comprises a recording device which register the signal or the modified signal and which is able to make a distinction between the presence of absence of a perforation.
  • An source device can be made of oscillating signal sources, such as sound or light signals in order to make it as independent as possible from surrounding conditions, the frequency can be used outside of the standard conditions, such as ultraviolet lights or ultra sonic sounds.
  • the signal might be permanent pulsating with a defined frequency, or just generated at the moment that it is accepted that a perforation will pass along the detecting device.
  • the recording device may consist of any known device suitable for recording an oscillating signal. Example an photo-electric cells, digital camera's, microphones, etc...
  • This signal can be compared to a standard signal, and used as a base for detecting failure in the perforation.
  • the system can be operated as described above.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)

Abstract

Device for perforating a flexible film (1) by means of a laser beam, comprising a laser beam generator, transport means for transporting the flexible film through the laser beam and focusing means for focussing the laser beam on the film surface, where in that a detector(14) is positioned along the path of movement of the flexible film for detecting whether the perforation has been made in the correct way.

Description

Device for perforating a flexible film
The invention relates to a device for perforating a flexible film by means of a laser beam, comprising a laser beam generator, transport means for transporting the film through the laser beam and means for focussing the laser beam on the film surface.
Such a device is generally known. Reference can be made to PCT/EP01/08944.
In a number of applications of such a perforated film it is important that the perforations have been made in a reliable way, i.e. there has been no failure either as a result of malfunction of the laser device or irregularities in the film used. This is especially true for flexible film to be used as packaging material for vegetables or fruit, as the perforations are required to obtain the optimal conservation of the packaged products. Failures in the perforations made can result in poor or inadequate conservation, with considerable consequences for the end user or the producer of vegetable packs. It is therefore a requirement to have the perforations made in a reliable way.
The object of the invention is to provide a device according to the preamble of claim 1 , in which this problem and other problems have been solved.
This object is obtained in that a detector is positioned along the path of movement of the flexible film for detecting whether the perforation has been made in the correct way.
By checking the presence and the quality of the perforation in the film it is possible to apply correction perforations by applying additional perforation to the flexible film in such a way that the total surface area of perforation, with respect to the required surface area is maintained. Other advantages and characteristics of the invention will become clear from the following description, reference being made to the annexed drawing, representing a schematic cross-section of a device according to the invention. In the drawing there is shown a flexible film 1 such as a plastic film which is transported from a supply reel 2 to a take up reel 3 and in between passes along a laser perforating device as will be described below. Although the invention will be described with respect to this embodiment it must be clear that any other film transport system can be used in connection with the perforating device according to the invention. More specifically it is possible to replace the take-up reel by another system in which the film is further treated, e.g. in order to produce bags and fill the same in an on-line operation as described in PCT/EP01 /08944.
The laser perforating device comprises a first house 10, preferably with a cylindrical cross section having one end wall 11 oriented towards the film 1 and provided with an opening 12 with circular cross section. The cylindrical portion of the house 10 is provided with an internal screw thread 12 and a holding plate 17 provided with external screw thread is screwed into the housing 10. The holding plate is provided with a bore 13 in which a laser beam generating device 14 is fixed to the plate 17. This is done in such a way that the laser beam generated by the device 14 is aligned with the opening 12 in the end wall 11.
The laser beam generating device 14 is provided with optical focussing means allowing the focussing of the beam at a defined place in order to concentrate the energy. By means of the screw connection between the housing 10 and the plate 17 it is possible to change the position of this focussing point, and to adjust it in such a way that the point coincides with the plane along which the film 1 is passing along the opening 12.
The plate 12 is also provided with an opening 15 which through a house 16 is connected to a source of pressurized air or another gas. Through this system it is possible to introduce pressurized air in the house 10, which air will leave the T/EP2004/014375
3 house through the opening 12. This air will provide an air cushion between the film 1 and the end wall 11 , and provide a smooth support for the film 1 passing along the wall 11.
In view of the relative position of the transport system (or the position of the reels 2 and 3) of the film, the latter is slightly curved along the end wall 11 , but will not be in contact therewith because of this air cushion. In this way damage to the film surface can be avoided. Moreover the pressurized air will prevent dust from entering the chamber 18 formed by the housing 11 and the plate 12, thereby avoiding contamination of the laser beam generating system, which contamination can influence the power of the laser beam. Moreover, the wear and tear of the external surface of the end wall 11 is reduced. Preferably the air of gas used is a dust-free dry gas.
At the other side of the film 1 there is positioned a second comparable housing 20 having an end wall 21 provided with an opening 22 which is aligned with the laser beam.
The housing 20 is provided with an internal screw thread and a holding plate 27 provided with a threaded portion is mounted to the housing 21 to close the other end. The whole construction might be identical to the construction of the laser housing or it might also be different. The plate 27 is provided with an opening 23 in which there is mounted a photo-electric sensor 24 which is especially sensitive to the laser beam wave length(s). This sensor 24 is also aligned to the laser beam generated by the device 14. The sensor 24 is provided with focussing means in order to adjust the measuring point of the sensor. By means of the screw connection between the housing 20 and the plate 27 it is possible to adjust the sensor 24 in such a way that its focussing point is exactly positioned in the plane of the film passing along the plate 21.
In the plate 21 there is provided an opening 25 which is connected to a hose 26 which otherwise is connected to an air suction device, e.g. a fan or the like. In this way air is suctioned through the split between the wall 21 and the film 1 , into 75
4 the opening 27 and through the space 28 defined by the housing 20 and the plate 27 and evacuated through opening 25 and hose 26. By means of this air flow the film 1 is kept away from the plate 27 and the system is cleaned so that no dust accumulation can take place. The suction of air is especially important to remove the gases and other residers generated by the perforation of the film by the laser beam.
It is obvious that the laser beam generating device 14 and the sensor 24 are provided with the required electrical connections, in order to perform the functions as described below. The sensor 24 is connected to a control unit which compares the output signal of the sensor with a set threshold value. This set value is such that it is an indication of whether the film has been perforated in the right way or not. From the relative position of the different components it is obvious that the light intensity measured by the sensor 24 is dependent upon the existence of a perforation or hole in the film. As long as no perforation has been made the measured intensity is relatively low due to the light diffusion by the film. As soon as the perforation has been made, this light intensity will increase substantially and this difference can easily be measured by the sensor and the control system. During operation the laser beam generator device 14 is activated intermittently so that at regular internals perforations are made in the film 1 while the same is moving along the opening 1. Each time the generator 14 is activated, a signal is transmitted to the control unit of the sensor in order to compare the sensor signal with the set threshold value in order to detect whether the perforation has been made. The control unit can further be designed in such a way that either each failure is signalled, or a warning signal is generated each time a defined number of failures has occurred, or a warning signal is generated each time a preset number of failures has occurred compared to a preset number of perforations to be made. Otherwise if a perforation has been missing it is possible to give an additional activation signal to the laser beam generator, thereby proceeding an additional perforation in the neighbourhood of the one of the missed perforation. In a preferred embodiment of the invention a part of the laser beam generated by the generator 14 is directed directly to a sensor provided within the housing 10. The signal generated by this sensor is transmitted to the control unit of the sensor 24 and used as a reference signal for comparison with the signal of the sensor 24.
In this way the generation of a warning signal can be made independent of the change in output of the laser beam generating device 14, which can be due to contamination or ageing. At the same time the second sensor signal can be used as a warning signal for detecting that the intensity of the laser beam has decreased to below a preset value and the generator 14 needs revision or replacement.
In a modified embodiment of the invention the detection device for detecting the quality of the perforation is made independent of the perforating device itself.
As new in the direction of movement of the films 1 a separate device may be positioned downstream with respect to the lower preferably device.
Basically such a device can consists of a source signal generator, i.e. a device generating a permanent of intermittent signal which will be altered by the presence of a perforation. Intermittently means that the source signal is at least generated each time it is accepted that a perforation will pass along the device. Otherwise it comprises a recording device which register the signal or the modified signal and which is able to make a distinction between the presence of absence of a perforation.
An source device can be made of oscillating signal sources, such as sound or light signals in order to make it as independent as possible from surrounding conditions, the frequency can be used outside of the standard conditions, such as ultraviolet lights or ultra sonic sounds.
The signal might be permanent pulsating with a defined frequency, or just generated at the moment that it is accepted that a perforation will pass along the detecting device. The recording device may consist of any known device suitable for recording an oscillating signal. Example an photo-electric cells, digital camera's, microphones, etc...
It is obvious that the presence of a perforation will influence the signal received by the recoding device.
This signal can be compared to a standard signal, and used as a base for detecting failure in the perforation.
If a failure is detected the system can be operated as described above.
It is obvious that the invention is not restricted to the embodiment shown and described, but that within the scope of the claims modification may be applied.

Claims

1. Device for perforating a flexible film by means of a laser beam, comprising a laser beam generator, transport means for transporting the flexible film through the laser beam and focusing means for focussing the laser beam on the film surface, characterizing in that a detector is positioned along the path of movement of the flexible film for detecting whether the perforation has been made in the correct way.
2. Device according to claim 1 , characterized in that the detector comprises a signal generator such as a light or sound signal positioned at one side of the moving film, a signal registering device positioned at the opposite side of the moving film, and a comparing device for comparing the registered signal with a standard setting.
3. Device according to claim 2, characterized in that the signal generator is the laser beam generator.
4. Device according to claim 3 characterized in that the laser beam generator is positioned within a housing having an opening through which the laser beam is directed to the film surface and in that an overpressure is maintained within the housing and a gasflow is maintained through the laser beam opening therein.
5. Device according to claim 4, characterized in that the laser beam generator is mounted within the housing and that the position of the laser beam generator is adjustable with respect to the laser beam opening.
6. Device according to claim 5, characterized in that the laser beam generator is movable by means of a screw thread mechanism.
7. Device according to anyone of the claims 3-6, characterized in that a second sensor is positioned in a part of the laser beam before reaching the film surface.
8. Device according to claims 1 or 2, characterized in that as seen in the direction of movement of the film the detective is positioned after the laser beam generator.
9. Device according to claim 8, characterized in that the registering device is a digital camera and the signal is a light signal.
10. Device according to claim 7, characterized in that the registering device is a microphone and the signal a sound signal.
PCT/EP2004/014375 2004-12-13 2004-12-13 Device for perforating a flexible film WO2006063609A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2004/014375 WO2006063609A1 (en) 2004-12-13 2004-12-13 Device for perforating a flexible film

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Application Number Priority Date Filing Date Title
PCT/EP2004/014375 WO2006063609A1 (en) 2004-12-13 2004-12-13 Device for perforating a flexible film

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WO2006063609A1 true WO2006063609A1 (en) 2006-06-22

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009132663A1 (en) * 2008-04-29 2009-11-05 Perfotec B.V. A process for making perforations in a plastic film material
WO2011151245A1 (en) 2010-06-01 2011-12-08 Perfotec B.V. Apparatus for making perforations in a packaging material and method of adjusting such an apparatus
US8814430B2 (en) 2010-02-23 2014-08-26 Kraft Foods R&D, Inc. Food package having opening feature
WO2014129904A1 (en) 2013-02-25 2014-08-28 Perfo Knowledgy B.V. Method and system for packaging respiring produce
WO2017220801A1 (en) 2016-06-23 2017-12-28 't Groene Loo B.V. Packaging of respiring produce
WO2018147736A1 (en) 2017-02-08 2018-08-16 Perfo Tec B.V. Method and apparatus for packaging respiring produce
US10273027B2 (en) 2014-10-24 2019-04-30 Multi-Pack Chicago Llc Systems and methods for forming dual layer water soluble packets
WO2020190143A1 (en) 2019-03-21 2020-09-24 Perfo Tec B.V. Method and apparatus for packaging respiring produce

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US4960970A (en) * 1989-08-11 1990-10-02 General Electric Company Method and apparatus for acoustic breakthrough detection
EP0881025A1 (en) * 1997-05-26 1998-12-02 Japan Tobacco Inc. Piercing apparatus for a web material
US6046427A (en) * 1995-10-07 2000-04-04 Sig Combibloc Gmbh Process and device to cut, perforate or inscribe repeating patterns in continuously-moving flat material
WO2002012068A1 (en) * 2000-08-03 2002-02-14 Backus Sormac B.V. Method for packaging products prone to decay
US6369356B1 (en) * 1998-05-22 2002-04-09 Daimlerchrysler Ag Method and system for monitoring and/or documenting a laser machining operation
US20030192865A1 (en) * 2002-04-16 2003-10-16 W.A. Whitney Co. Method and apparatus for laser piercing and cutting metal sheet and plate
DE10254377B3 (en) * 2002-11-19 2004-03-18 Jenoptik Automatisierungstechnik Gmbh Producing integrated preferred break line in flat structure involves directing laser beam at processing side of material to produce holes by removing material that are not visible on decorative side

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Publication number Priority date Publication date Assignee Title
US4297559A (en) * 1979-05-10 1981-10-27 Olin Corporation Apparatus for controlled perforation of moving webs with fixed focus laser beam
US4960970A (en) * 1989-08-11 1990-10-02 General Electric Company Method and apparatus for acoustic breakthrough detection
US6046427A (en) * 1995-10-07 2000-04-04 Sig Combibloc Gmbh Process and device to cut, perforate or inscribe repeating patterns in continuously-moving flat material
EP0881025A1 (en) * 1997-05-26 1998-12-02 Japan Tobacco Inc. Piercing apparatus for a web material
US6369356B1 (en) * 1998-05-22 2002-04-09 Daimlerchrysler Ag Method and system for monitoring and/or documenting a laser machining operation
WO2002012068A1 (en) * 2000-08-03 2002-02-14 Backus Sormac B.V. Method for packaging products prone to decay
US20030192865A1 (en) * 2002-04-16 2003-10-16 W.A. Whitney Co. Method and apparatus for laser piercing and cutting metal sheet and plate
DE10254377B3 (en) * 2002-11-19 2004-03-18 Jenoptik Automatisierungstechnik Gmbh Producing integrated preferred break line in flat structure involves directing laser beam at processing side of material to produce holes by removing material that are not visible on decorative side

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009132663A1 (en) * 2008-04-29 2009-11-05 Perfotec B.V. A process for making perforations in a plastic film material
US9187195B2 (en) 2008-04-29 2015-11-17 Perfotec B.V. Process for making perforations in a plastic film material
US8814430B2 (en) 2010-02-23 2014-08-26 Kraft Foods R&D, Inc. Food package having opening feature
WO2011151245A1 (en) 2010-06-01 2011-12-08 Perfotec B.V. Apparatus for making perforations in a packaging material and method of adjusting such an apparatus
EP2764948A1 (en) 2010-06-01 2014-08-13 Perfo Knowledgy BV Apparatus for making perforations in a packaging material and method of adjusting such an apparatus
WO2014129904A1 (en) 2013-02-25 2014-08-28 Perfo Knowledgy B.V. Method and system for packaging respiring produce
US10273027B2 (en) 2014-10-24 2019-04-30 Multi-Pack Chicago Llc Systems and methods for forming dual layer water soluble packets
US11077974B2 (en) 2014-10-24 2021-08-03 Multi-Pack Chicago Llc Systems and methods for forming dual layer water soluble packets
WO2017220801A1 (en) 2016-06-23 2017-12-28 't Groene Loo B.V. Packaging of respiring produce
WO2018147736A1 (en) 2017-02-08 2018-08-16 Perfo Tec B.V. Method and apparatus for packaging respiring produce
US11247793B2 (en) 2017-02-08 2022-02-15 Perfo Tec B.V. Method and apparatus for packaging respiring produce
WO2020190143A1 (en) 2019-03-21 2020-09-24 Perfo Tec B.V. Method and apparatus for packaging respiring produce

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