WO1995021045A1 - Process for removing the coating of metallised disk-shaped information carriers - Google Patents

Process for removing the coating of metallised disk-shaped information carriers Download PDF

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Publication number
WO1995021045A1
WO1995021045A1 PCT/EP1995/000368 EP9500368W WO9521045A1 WO 1995021045 A1 WO1995021045 A1 WO 1995021045A1 EP 9500368 W EP9500368 W EP 9500368W WO 9521045 A1 WO9521045 A1 WO 9521045A1
Authority
WO
WIPO (PCT)
Prior art keywords
information carriers
shaped information
coating
metallised
disk
Prior art date
Application number
PCT/EP1995/000368
Other languages
German (de)
French (fr)
Inventor
Detlef Ermacora
Original Assignee
Warner Music Manufacturing Europe Gmbh
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 Warner Music Manufacturing Europe Gmbh filed Critical Warner Music Manufacturing Europe Gmbh
Priority to AU15773/95A priority Critical patent/AU1577395A/en
Publication of WO1995021045A1 publication Critical patent/WO1995021045A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
    • B24C1/08—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for polishing surfaces, e.g. smoothing a surface by making use of liquid-borne abrasives
    • B24C1/086—Descaling; Removing coating films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C11/00—Selection of abrasive materials or additives for abrasive blasts
    • 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
    • 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
    • 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
    • B29K2033/00—Use of polymers of unsaturated acids or derivatives thereof as moulding material
    • B29K2033/04—Polymers of esters
    • B29K2033/12—Polymers of methacrylic acid esters, e.g. PMMA, i.e. polymethylmethacrylate
    • 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 stripping metallized, plate-shaped information carriers, such as CDs. being the surface of the
  • CD is irradiated with a granular material.
  • Disc-shaped information carriers in the sense of the invention are, for example, audio and video CDs, laser disks, mini disks, CDIs and CD-ROMs. To simplify all of these information carriers are summarized below under the term CD.
  • the stripped CDs are usually ground to a granulate and sprayed or cast into other products.
  • the stripped CDs must be cleaned thoroughly to remove all traces of the abrasive material.
  • Residues would remain, especially when reusing the granulate to make new CDs. drastically increase the reject rate.
  • the invention has for its object to reduce the post-cleaning effort in the stripping and thus also to reduce the reject rate when reusing the granulate for the production of information carriers.
  • this object is achieved in that the granular
  • Material is a granulate made of a thermosetting plastic.
  • the granulate preferably consisting of the same plastic as CD. According to an advantageous development of the invention, the granulate is obtained directly from the reject workpieces.
  • the process according to the invention has the advantage that any residues of the granules used for the stripping on the information carriers are less problematic than residues of a different type, such as residues based on quartz.
  • the outlay which has to be carried out in the subsequent cleaning can therefore be significantly reduced compared to known processes.
  • the granulate is obtained from the scrap workpieces in production, for example from polymethyl methacrylate (PPMA) or polycarbonate (PC), this is associated with a considerable price advantage.
  • PPMA polymethyl methacrylate
  • PC polycarbonate
  • the granulate is usually mixed with a high pressure water jet. Grain size and jet speed correspond to the usual values known to the person skilled in the art. It is also possible to use the granulate dry, similar to sandblasting.

Abstract

A process is disclosed for removing the coating of metallised, disk-shaped information carriers, such as CD's. The surface of the CD is bombarded with a granulated material, i.e. a pressure setting plastic. The granulate is preferably made of the same plastic as the CD.

Description

Verfahren zum Entschichten metallisierter, plattenförmiger InformationsträgerProcess for stripping metallized, plate-shaped information carriers
Die Erfindung betrifft ein Verfahren zum Entschichten metallisierter, platten förmiger Informationsträger, wie CDs. wobei die Oberfläche derThe invention relates to a method for stripping metallized, plate-shaped information carriers, such as CDs. being the surface of the
CD mit einem körnigen Material bestrahlt wird.CD is irradiated with a granular material.
Plattenförmige Informationsträger im Sinne der Erfindung sind beispielsweise Audio- und Video-CDs, Laserdisks, Minidisks, CDIs und CD-ROM. Zur Vereinfachung werden all diese Informationsträger nachfolgend unter dem Begriff CD zusammengefaßt.Disc-shaped information carriers in the sense of the invention are, for example, audio and video CDs, laser disks, mini disks, CDIs and CD-ROMs. To simplify all of these information carriers are summarized below under the term CD.
Es ist bereits bekannt, zur Wiederau fbereitung von Ausschußwerkstücken CDs mit einem Hochdruckwasserstrahl zu beaufschlagen, dem abrasives Material, beispielsweise Sand oderIt is already known to act on the reprocessing of rejects CD with a high pressure water jet, the abrasive material, such as sand or
Glaskugeln beigefügt ist. Auch das Entschichten mittels eines trockenen Sandstrahls wurde bereits vorgeschlagen (DE-A-35 11 711).Glass balls are attached. De-coating using a dry sandblast has also already been proposed (DE-A-35 11 711).
Die entschichteten CDs werden üblicherweise zu einem Granulat vermählen und zu anderen Produkten verspritzt bzw. vergossen. Für denThe stripped CDs are usually ground to a granulate and sprayed or cast into other products. For the
Fall, daß sie der Herstellung von Informationsträgern wieder zugeführt werden sollen, müssen sie mit einem gewissem Anteil frischen Granulats vermischt werden, um die geforderten Produkteigenschaften sicherzustellen. In jedem Fall müssen die entschichteten CDs gründlich gereinigt werden, um alle Spuren des abrasiven Materials zu entfernen.If they are to be returned to the production of information carriers, they have to be mixed with a certain proportion of fresh granules in order to ensure the required product properties. In any case, the stripped CDs must be cleaned thoroughly to remove all traces of the abrasive material.
Verbleibende Rückstände würden, insbesondere bei der Wiederverwendung des Granulats zur Herstellung neuer CDs. die Ausschußrate drastisch erhöhen.Residues would remain, especially when reusing the granulate to make new CDs. drastically increase the reject rate.
Der Erfindung liegt die Aufgabe zugrunde, den Nachreinigungsaufwand bei der EntSchichtung zu senken und damit auch die Ausschußrate bei der Wiederverwendung des Granulats für die Herstellung von Informationsträgern zu reduzieren.The invention has for its object to reduce the post-cleaning effort in the stripping and thus also to reduce the reject rate when reusing the granulate for the production of information carriers.
Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß das körnigeAccording to the invention this object is achieved in that the granular
Material ein Granulat aus einem duropiastischen Kunststoff ist. wobei das Granuiat vorzugsweise aus dem gleichen Kunststoff besteht, wie CD. Gemäß einer vorteilhaften Weiterbildung der Erfindung wird das Granulat direkt aus den Ausschußwerkstücken gewonnen.Material is a granulate made of a thermosetting plastic. the granulate preferably consisting of the same plastic as CD. According to an advantageous development of the invention, the granulate is obtained directly from the reject workpieces.
Das erfindungsgemäße Verfahren hat den Vorteil, daß etwaige Rückstände des zum Entschichten benutzten Granulats auf den Informationsträgern weniger problematisch sind, als artfremde Rückstände, wie zum Beispiel Rückstände auf Quarzbasis. Der Aufwand, der bei der Nachreinigung betrieben werden muß, kann daher ö ge'-sge--nüber bekannten Verfahren deutlich reduziert werden.The process according to the invention has the advantage that any residues of the granules used for the stripping on the information carriers are less problematic than residues of a different type, such as residues based on quartz. The outlay which has to be carried out in the subsequent cleaning can therefore be significantly reduced compared to known processes.
Wird das Granulat aus den Ausschußwerkstücken der Produktion gewonnen, also beispielsweise aus Polymetylmetacrylat (PPMA) oder Polycarbonate (PC) ist damit ein erheblicher Preisvorteil verbunden.If the granulate is obtained from the scrap workpieces in production, for example from polymethyl methacrylate (PPMA) or polycarbonate (PC), this is associated with a considerable price advantage.
Das Granulat wird üblicherweise einem Hochdruckwasserstrahl beigemischt. Korngröße und Strahlgeschwindigkeit entsprechen den üblichen, dem Fachmann bekannten, Werten. Es ist auch möglich, das Granulat ähnlich wie beim Sandstrahlen, trocken zu verwenden. The granulate is usually mixed with a high pressure water jet. Grain size and jet speed correspond to the usual values known to the person skilled in the art. It is also possible to use the granulate dry, similar to sandblasting.

Claims

Patentansprüche:Claims:
1. Verfahren zum Entschichten metallisierter, plattenförmiger Informationsträger, wie CDs wobei die Oberfläche der CD mit einem körnigen Material bestrahlt wird, dadurch gekennzeichnet, daß das körnige Material ein Granulat aus einem duroplastischen Kunststoff ist.1. A method for stripping metallized, plate-shaped information carriers, such as CDs, the surface of the CD being irradiated with a granular material, characterized in that the granular material is a granulate made of a thermosetting plastic.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Granulat aus dem gleichen Kunststoff besteht wie die CD.2. The method according to claim 1, characterized in that the granules consist of the same plastic as the CD.
Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß dasA method according to claim 2, characterized in that the
Granu ullat aus dem Ausschuß bei der Herstellung der CDs gewonnen wird.Granu ullat is obtained from the committee in the manufacture of the CDs.
4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß das4. The method according to claim 3, characterized in that the
Granulat aus PMMA oder PC besteht. Granules made of PMMA or PC.
PCT/EP1995/000368 1994-02-02 1995-02-01 Process for removing the coating of metallised disk-shaped information carriers WO1995021045A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU15773/95A AU1577395A (en) 1994-02-02 1995-02-01 Process for removing the coating of metallised disk-shaped information carriers

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19944403173 DE4403173A1 (en) 1994-02-02 1994-02-02 Process for stripping metallized, plate-shaped information carriers
DEP4403173.4 1994-02-02

Publications (1)

Publication Number Publication Date
WO1995021045A1 true WO1995021045A1 (en) 1995-08-10

Family

ID=6509296

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1995/000368 WO1995021045A1 (en) 1994-02-02 1995-02-01 Process for removing the coating of metallised disk-shaped information carriers

Country Status (3)

Country Link
AU (1) AU1577395A (en)
DE (1) DE4403173A1 (en)
WO (1) WO1995021045A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19640945A1 (en) * 1996-10-04 1998-04-16 Polygram Manufacturing & Distr Method and device for mechanically removing a foreign matter coating from a base material
DE19703104A1 (en) * 1997-01-29 1998-07-30 Walter Schlutius Recycling of the polycarbonate content of compact discs
DE19709052A1 (en) * 1997-03-06 1998-09-10 Spies Klaus Prof Dr Ing Dr H C Method and device for removing a coating adhering to the plastic body of a digital storage disc
DE10000566A1 (en) * 2000-01-08 2001-07-26 Messer Griesheim Gmbh Recycling of surface coated plastic components, e.g. lacquered car parts, involves loosening bond of coating followed by its removal by cryogenic treatment

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3245099A1 (en) * 1982-12-07 1984-06-07 Hohn, Andreas Blasting agent for removing flash on plastic parts
GB2137533A (en) * 1983-04-07 1984-10-10 Vault Corp Controlled removal of oxide coating from floppy disks
DE3511711A1 (en) * 1985-03-29 1986-10-02 Polygram Gmbh, 2000 Hamburg Reprocessing high-quality plastics from wastes and reject workpieces
JPS63221975A (en) * 1987-03-09 1988-09-14 Sekisui Plastics Co Ltd Synthetic resin grains for polishing
EP0332886A2 (en) * 1988-03-12 1989-09-20 Klaus Bloch Thermoplastic abrasive blasting material
JPH05269744A (en) * 1992-03-27 1993-10-19 Sintokogio Ltd Method for releasing coating from coated plastic product
US5261191A (en) * 1990-09-15 1993-11-16 Waltom Services, Inc. Method of surface preparation
JPH0691652A (en) * 1992-09-14 1994-04-05 Sumitomo Dow Ltd Method for removing decorated part from decorated resin plate molded piece and method for recycling decorated resin plate molded piece

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3245099A1 (en) * 1982-12-07 1984-06-07 Hohn, Andreas Blasting agent for removing flash on plastic parts
GB2137533A (en) * 1983-04-07 1984-10-10 Vault Corp Controlled removal of oxide coating from floppy disks
DE3511711A1 (en) * 1985-03-29 1986-10-02 Polygram Gmbh, 2000 Hamburg Reprocessing high-quality plastics from wastes and reject workpieces
JPS63221975A (en) * 1987-03-09 1988-09-14 Sekisui Plastics Co Ltd Synthetic resin grains for polishing
EP0332886A2 (en) * 1988-03-12 1989-09-20 Klaus Bloch Thermoplastic abrasive blasting material
US5261191A (en) * 1990-09-15 1993-11-16 Waltom Services, Inc. Method of surface preparation
JPH05269744A (en) * 1992-03-27 1993-10-19 Sintokogio Ltd Method for releasing coating from coated plastic product
JPH0691652A (en) * 1992-09-14 1994-04-05 Sumitomo Dow Ltd Method for removing decorated part from decorated resin plate molded piece and method for recycling decorated resin plate molded piece

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 8843, Derwent World Patents Index; AN 88-303163 *
PATENT ABSTRACTS OF JAPAN vol. 18, no. 354 5 July 1994 (1994-07-05) *
PATENT ABSTRACTS OF JAPAN vol. 18, no. 37 20 January 1994 (1994-01-20) *

Also Published As

Publication number Publication date
AU1577395A (en) 1995-08-21
DE4403173A1 (en) 1995-08-03

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