WO1993016855A1 - Procede et dispositif d'enlevement d'une couche reflechissante appliquee sur un support d'enregistrement - Google Patents

Procede et dispositif d'enlevement d'une couche reflechissante appliquee sur un support d'enregistrement Download PDF

Info

Publication number
WO1993016855A1
WO1993016855A1 PCT/NL1993/000004 NL9300004W WO9316855A1 WO 1993016855 A1 WO1993016855 A1 WO 1993016855A1 NL 9300004 W NL9300004 W NL 9300004W WO 9316855 A1 WO9316855 A1 WO 9316855A1
Authority
WO
WIPO (PCT)
Prior art keywords
recording medium
knife
shaped element
record carrier
layer
Prior art date
Application number
PCT/NL1993/000004
Other languages
German (de)
English (en)
Inventor
Karl-Heinz Hering
Peter Ploj
Original Assignee
Polygram Manufacturing & Distribution Centres Gmbh
Polygram International Holding B.V.
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 Polygram Manufacturing & Distribution Centres Gmbh, Polygram International Holding B.V. filed Critical Polygram Manufacturing & Distribution Centres Gmbh
Publication of WO1993016855A1 publication Critical patent/WO1993016855A1/fr

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/02—Separating plastics from other materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2069/00—Use of PC, i.e. polycarbonates or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2705/00—Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2009/00—Layered products
    • B29L2009/005—Layered products coated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2017/00—Carriers for sound or information
    • B29L2017/001—Carriers of records containing fine grooves or impressions, e.g. disc records for needle playback, cylinder records
    • B29L2017/003—Records or discs
    • B29L2017/005—CD''s, DVD''s
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/62—Plastics recycling; Rubber recycling

Definitions

  • the invention relates to a method for removing a reflective layer applied to a plastic substrate of a plate-shaped recording medium.
  • Another possibility described is a mechanical method in which high-pressure water jets, to which an abrasive material, such as sand, is added, are directed onto the sides of the reject parts to be stripped.
  • a disadvantage of this is that particles of the abrasive material penetrate into the plastic substrate and remain therein, as a result of which this plastic is contaminated.
  • the use of a roller or brush is also proposed.
  • a disadvantage of using a roller is that the scrap workpieces are difficult to handle when stripping.
  • the use of a rotary brush has the disadvantage that smearing occurs easily, which makes effective de-coating difficult.
  • excessive heat development for the plastic can arise.
  • the object of the invention is now to provide a fast, effective and inexpensive method for removing a reflective layer applied to a plastic substrate of a record carrier.
  • This object is achieved by a method which is characterized in accordance with the invention in that a knife-shaped element is used, the recording medium being cut through a mutual displacement of the recording medium and the knife-shaped element in a plane extending parallel to the reflecting layer, whereby a shell containing at least almost the entire reflective layer is removed and a carrier part containing at least almost the entire substrate remains.
  • a metal layer made of, for example, aluminum or silver is generally used as the reflecting layer.
  • this layer is lifted off as a whole in a single stripping process in a peeling station and, as a removed peeling chip, is at least almost completely removed.
  • other layers such as protective lacquer layers, overprints, stickers, labels, etc. can be applied. When using the method according to the invention, these layers can of course be removed together with the reflecting layer.
  • One embodiment of the method according to the invention is characterized in that the recording medium and the knife-shaped element are aligned with respect to one another in such a way that a cutting surface of the element mentioned with the reflective layer includes an intersection angle between 82 ° and 86 °.
  • One embodiment of the method according to the invention is characterized in that the recording medium is attached to a holding device which is movable relative to the stationary knife-shaped element.
  • a turntable with a driver for the recording medium is preferably used as the portable holding device.
  • One embodiment of the method according to the invention is characterized in that when the recording medium is cut through, the recording medium and the knife-shaped element are displaced relative to one another at a relative speed between 0.05 and 0.15 m / s. A speed of 0.10 m / s is preferably set.
  • An embodiment of the method according to the invention, wherein a protective layer made of a polymer, for example an acrylate-containing protective lacquer or UV-curable protective lacquers, is provided on the reflective layer is characterized in that before the recording medium is cut through, it is brought into a moist environment.
  • the recording medium can be suitably moistened with water vapor before the stripping process. It is thereby achieved that the peeling chip formed when the layer is lifted rolls up and can thus be easily removed from the peeling station.
  • One embodiment of the method according to the invention is characterized in that for the mutual alignment of the record carrier and the knife-shaped element, a side determined by the reflective layer, the so-called layer side, of the record carrier is detected.
  • the position of the record carrier can be recognized, after which it can be turned over in the wrong position and positioned in such a way that the side bearing the layer mentioned faces the knife-shaped element. This ensures that only the coated side is processed and consequently the resulting waste is minimized and valuable raw material is preserved.
  • An embodiment of the method according to the invention is characterized in that one side of the recording medium is exposed to heat radiation, the heat radiation reflected by the recording medium being detected and converted into a measurement signal, and on the basis of this measurement signal it is detected according to a predetermined selection criterion whether the irradiated side is provided with the reflective layer. A method is thus created with which the layer side of the recording medium can be automatically and easily detected.
  • Plastics have an absorption spectrum for heat rays that differs from that of the reflective layer. This is the extent to which Heat rays are reflected, depending on whether the layer side or the carrier side of the recording medium is irradiated, so that it can be detected on the basis of the measurement signal whether the irradiated side is the layer side.
  • One embodiment of the method according to the invention is characterized in that the ambient temperature of the recording medium is determined, the predetermined selection criterion being adapted depending on the determined ambient temperature.
  • This embodiment has the advantage that any changes in the ambient temperature hardly affect the reliability of the detection.
  • An embodiment of the method according to the invention, wherein such mixing can be avoided is characterized in that, before the record carrier is cut, an identifier of the record carrier is detected to determine whether the record carrier belongs to a predetermined collection of record carriers.
  • a label that is already present or added due to the manufacturing process of the record carrier can be used as the label.
  • the use of the flat layer side of the recording medium, which is not provided with a recess or a projection and is determined by the reflecting layer, is preferred as the identifier.
  • the recording medium is preferably processed at these points in a special process. This is preferably done after peeling, with any coating residues being removed by chip removal.
  • the use of rasp processing in the edge and / or center hole area has proven effective in this regard.
  • the washing liquid is preferably filtered continuously and circulated, a permanent exchange of the washing solution taking place through a defined carry-over of liquid and the replacement of the carry-over losses with fresh solution.
  • the carrier part cleaned in this way can then be used as the starting material for producing new optical disks. Instead of using only one brush, the use of double-sided brushes can offer advantages.
  • Another object of the invention is to provide a simple, but expedient device for carrying out the method according to the invention. Therefore, the invention also relates to a device for performing the method according to the invention.
  • the device according to the invention is characterized by the presence of a peeling device which comprises a holding device for holding at least one recording medium provided with a reflective layer and a knife-shaped element for cutting through in a plane of the recording medium which extends parallel to the reflecting surface.
  • An embodiment of the device according to the invention is characterized in that the knife-shaped element is arranged in a stationary manner in the peeling device and the holding device is displaceably mounted relative to the knife-shaped element.
  • the holding device preferably comprises a turntable which can be rotated about an axis of rotation and has a driver element which removes the record carrier from a magazine during the rotation of the turntable and guides it under the stationary knife-shaped element.
  • An embodiment of the device according to the invention, with which the shells formed when carrying out the method according to the invention are effectively removed and collected, is characterized by the presence of a peeling chip suction device.
  • An embodiment of the device according to the invention is characterized by the presence of a rasping device or milling device for removing coating parts in the edge and / or center hole area of the recording medium.
  • This embodiment is preferably also characterized by the presence of an extraction system.
  • One embodiment of the device according to the invention is known. is characterized by the presence of means for wetting the layer side of the recording medium determined by the reflecting layer and a protective layer present thereon.
  • the means mentioned preferably comprise a wetting space in which the recording medium can be kept at a suitable level of moisture for a certain time.
  • An embodiment of the device according to the invention is characterized by the presence of a detector arrangement which comprises a detector with a heat radiator, a radiation thermometer and a controller.
  • the control system regulates a switching point depending on the ambient temperature, monitors the heat radiator output and the function of a receiver, and outputs a control signal.
  • An embodiment of the device according to the invention is characterized by the presence of a detector unit for detecting an identification of the * record carrier.
  • An embodiment of the invention is shown in the drawing and will be described in more detail below. Show it:
  • FIG. 1 shows a schematic illustration of the method according to the invention for stripping optical recording media or reject workpieces
  • FIG. 2 shows a schematic illustration of an optical recording media
  • Fig. 3 is a schematic representation of a knife-shaped element of the device according to the invention.
  • FIG. 4 shows a schematic illustration of a detector arrangement for detecting the layer side of a recording medium.
  • the device according to the invention shown in Fig. 1 comprises a
  • Peeling device 1 with a holding device which is provided with a turntable 5 rotatable about an axis of rotation 3, in the upper surface 7 of which a number, in this example four, depressions 9 are provided.
  • the direction of rotation of the turntable is marked with the letter R.
  • the device 1 is intended for stripping optical recording media, such as CDs or CD-ROMs.
  • Such a recording medium is shown schematically in FIG.
  • the recording medium designated by reference numeral 11 comprises a transparent plastic substrate 13 made of, for example, a polycarbonate of a specific specification, a layer 15, for example made of aluminum or silver, applied to the substrate and a protective layer 17 consisting of a polymer, such as an acrylate, thereon. In an area adjacent to the reflecting layer 15 there is an information surface 12 intended.
  • the record carrier 11 is provided with a central opening 19.
  • the circular-cylindrical or semicircular-cylindrical recesses 9 in the turntable 5, which act as drivers, are intended for receiving and temporarily holding the recording media.
  • the depressions each have a diameter adapted to the diameter of the recording medium 1. They also have a depth such that at least the layers 15 and 17 of an input recording medium protrude beyond the upper surface 7.
  • the peeling device 1 is further provided with a chisel or knife-shaped element 21 for cutting through the recording media in a plane extending transversely to the axis of rotation 3 of the turntable.
  • the knife-shaped element 21 is located so far above the upper surface 7 of the turntable 5 that, with a relative displacement of the turntable 5 and the knife-shaped element 21, a record carrier 11 present in the depression 9 is cut through in a plane extending parallel to the reflecting layer 15 , wherein a shell containing the reflective layer 15 and the layer 17 is separated from the substrate.
  • the knife-shaped element 21, which is arranged in a fixed position with respect to the platter 5, has a cutting surface 23 which, with the reflective layer 15 of the recording medium 11, encloses an angle of intersection ⁇ 84 °. In Fig. 3 the knife-shaped element 21 is shown schematically in an operating position.
  • a record carrier 11 to be decoated becomes a bunker
  • the recording media present in the bunker 25 preferably come from a space 29 in which the recording media have been moistened with water vapor for a suitable time. ._, "The conveyor system 27 guides the recording medium to be decoated
  • a heat radiator 33 or an IR radiator of a conventional type irradiates the recording medium 11 with heat rays.
  • the recording medium 11 will absorb the heat rays more or less. This is because the absorption spectrum of plastics differs significantly from that of the reflective layer 15.
  • the heat radiation originating from the recording medium 11 is detected using, for example, a conventional IR thermometer 35.
  • the IR thermometer 35 supplies a measurement signal Vm which is indicative of the heat radiation originating from the illuminated side of the recording medium 11.
  • the measurement signal Vm is fed to a control and monitoring unit 37, in which, based on the measurement signal Vm, it is detected according to a predetermined selection criterion whether the layer side 11a or the support side 11b of the recording medium 11 is irradiated by the heat radiator 33.
  • the control and monitoring unit 37 delivers a corresponding control signal S.
  • a temperature measuring instrument 39 can be used for this purpose, which supplies the control and monitoring unit 37 with a correction signal Vc which is indicative of the ambient temperature.
  • the control and monitoring unit 39 adapts the criterion depending on the correction signal Vc.
  • the record carrier 11 to be stripped continues to come on.
  • a detector unit 41 to determine whether the record carrier is of a predetermined type or class.
  • the record carrier is provided with an identifier which is detected in a manner known per se, for example mechanically or optically.
  • the mark can be of a simple type. In this example, it is formed by the flat layer side 11a of the recording medium. If the detected recording medium 11 is of a different type or class, it is discharged via a feedback system. However, if the record carrier is accepted, it is fed to a magazine 43, the record carrier 11 on the way there depending on the findings of the detector arrangement 31 is possibly tilted so that it reaches the turntable 5 in the correct position.
  • the record carriers fall into the recesses 9 of the turntable 5 rotating during operation.
  • the speed of rotation of the turntable 5 is compared to the fixed knife-shaped element 21 such that the record carrier with a Velocity v of about 0.10 m / s can be cut (see also Fig. 3).
  • the layers 15 and 17 are pushed off as a whole and removed almost completely, while the substrate 13 of the recording medium is almost completely retained. This ensures that the waste generated is minimized and valuable raw material is preserved.
  • the peeling chip lifted off a recording medium is removed from the turntable 5 by a suction device 45 and comminuted in a cutting mill, not shown in the drawing.
  • the remaining support part 13a (see FIG. 3) is removed from the relevant recess 9 in a mechanical manner.
  • the remaining carrier parts 13a are reworked in the above-mentioned areas after peeling, the removed material being machined and removed from the processing area by suction.
  • the cutting is carried out with the aid of a rasp or milling device 47. The others pass through to check for residue-free decoating
  • the stripped and reworked remaining carrier parts are then transferred to a cleaning system, where they are first wetted with water containing wetting agent and in a station 51 equipped with rotating brushes they are freed of adhering processing residues under running water. The water is freed of suspended matter by filtration and returned to the process.
  • the remaining carrier parts are cleaned by means of jet and spray nozzles and rinsed with ultrapure water in the last wet station. The water generated here is returned to the ultrapure water system for reprocessing.
  • the remaining carrier parts are freed of water by squeezing rollers and then dried with particle-free warm air.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Environmental & Geological Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing Optical Record Carriers (AREA)

Abstract

Un procédé permet d'enlever une couche réfléchissante (15) appliquée sur le substrat en matière plastique (13) d'un support d'enregistrement (11) en forme de disque. On utilise à cet effet un élément (21) en forme de couteau. En déplaçant le support d'enregistrement et l'élément en forme de couteau l'un par rapport à l'autre, on sectionne le support d'enregistrement dans un plan parallèle à la couche réfléchissante, de manière à enlever une croûte qui contient au moins presque toute la couche réfléchissante et à laisser une partie de support qui contient presque tout le substrat. On met en oeuvre le procédé au moyen d'un dispositif pourvu d'un organe de retenue du support d'enregistrement.
PCT/NL1993/000004 1992-02-21 1993-01-08 Procede et dispositif d'enlevement d'une couche reflechissante appliquee sur un support d'enregistrement WO1993016855A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19924205390 DE4205390A1 (de) 1992-02-21 1992-02-21 Verfahren zum entfernen einer reflektierenden schicht von einem aufzeichnungstraeger sowie vorrichtung zum durchfuehren dieses verfahrens
DEP4205390.0 1992-02-21

Publications (1)

Publication Number Publication Date
WO1993016855A1 true WO1993016855A1 (fr) 1993-09-02

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL1993/000004 WO1993016855A1 (fr) 1992-02-21 1993-01-08 Procede et dispositif d'enlevement d'une couche reflechissante appliquee sur un support d'enregistrement

Country Status (2)

Country Link
DE (1) DE4205390A1 (fr)
WO (1) WO1993016855A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4409174A1 (de) * 1994-03-17 1995-09-21 Eghbal Ketabtchi Hamid Verfahren zum Aufbereiten von bandförmigen Aufzeichnungsträgern
DE19703104A1 (de) * 1997-01-29 1998-07-30 Walter Schlutius Verfahren und Vorrichtungen zum Recykeln von Datenträgerplatten
AT405347B (de) * 1996-12-19 1999-07-26 Fuchs Umwelttechnik Ag Verfahren und vorrichtung zum aufbereiten von bandförmigen aufzeichnungsträgern

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19855803B4 (de) * 1998-12-03 2006-01-26 Gfm Gmbh Verfahren und Vorrichtung zum Herstellen einer Fase oder einer Keilnut an einem Werkstück
US6569259B1 (en) * 1999-03-30 2003-05-27 Taiyo Yuden Co., Ltd. Method of disposing of a waste optical disc
DE19940808C2 (de) * 1999-08-27 2002-10-31 Newcycle Kunststofftechnik Gmb Verfahren zum spanabhebenden Abtragen einer Oberflächenschicht einer Informationsträgerscheibe
GB0004663D0 (en) * 2000-02-29 2000-04-19 Polymer Reprocessors Ltd Improvements in and relating to disc handling apparatus
IT1394188B1 (it) * 2009-05-15 2012-06-01 CEFLA Società Cooperativa Apparato per la raccolta, per lo scarico e per il recupero dello sfrido della foglia di pvc o d'altra materia plastica, particolarmente del tipo impiegata nei procedimenti di rivestimento di pannelli od altri manufatti a prevalente estensione piana.

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3948507A (en) * 1974-11-25 1976-04-06 Xerox Corporation Copy stripper
DE3511711A1 (de) * 1985-03-29 1986-10-02 Polygram Gmbh, 2000 Hamburg Wiederaufbereitung hochwertiger kunststoffe aus abfaellen und ausschusswerkstuecken
EP0286961A2 (fr) * 1987-04-06 1988-10-19 Somar Corporation Elément de tirage-levage et unité de tirage-levage pour peler un film mince
EP0298200A2 (fr) * 1987-07-06 1989-01-11 Hoechst Celanese Corporation Procédé de séparation de feuilles tenant ensemble ou superposées
EP0342359A2 (fr) * 1988-05-14 1989-11-23 Harald Schmid Procédé et appareil de remise en état de disques d'enregistrement digital endommagés

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4123199C2 (de) * 1991-07-12 1994-09-01 Georg Witt Verfahren und Vorrichtung zum mechanischen Entfernen von Fremdstoffen vom Basismaterial eines plattenförmigen Informationsträgers

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3948507A (en) * 1974-11-25 1976-04-06 Xerox Corporation Copy stripper
DE3511711A1 (de) * 1985-03-29 1986-10-02 Polygram Gmbh, 2000 Hamburg Wiederaufbereitung hochwertiger kunststoffe aus abfaellen und ausschusswerkstuecken
EP0286961A2 (fr) * 1987-04-06 1988-10-19 Somar Corporation Elément de tirage-levage et unité de tirage-levage pour peler un film mince
EP0298200A2 (fr) * 1987-07-06 1989-01-11 Hoechst Celanese Corporation Procédé de séparation de feuilles tenant ensemble ou superposées
EP0342359A2 (fr) * 1988-05-14 1989-11-23 Harald Schmid Procédé et appareil de remise en état de disques d'enregistrement digital endommagés

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4409174A1 (de) * 1994-03-17 1995-09-21 Eghbal Ketabtchi Hamid Verfahren zum Aufbereiten von bandförmigen Aufzeichnungsträgern
AT405347B (de) * 1996-12-19 1999-07-26 Fuchs Umwelttechnik Ag Verfahren und vorrichtung zum aufbereiten von bandförmigen aufzeichnungsträgern
DE19703104A1 (de) * 1997-01-29 1998-07-30 Walter Schlutius Verfahren und Vorrichtungen zum Recykeln von Datenträgerplatten

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