DE2639169A1 - Pressing information-bearing thermoplastic discs under HF heating - using pref. silicone rubber forming plates of low dielectric loss - Google Patents

Pressing information-bearing thermoplastic discs under HF heating - using pref. silicone rubber forming plates of low dielectric loss

Info

Publication number
DE2639169A1
DE2639169A1 DE19762639169 DE2639169A DE2639169A1 DE 2639169 A1 DE2639169 A1 DE 2639169A1 DE 19762639169 DE19762639169 DE 19762639169 DE 2639169 A DE2639169 A DE 2639169A DE 2639169 A1 DE2639169 A1 DE 2639169A1
Authority
DE
Germany
Prior art keywords
dielectric loss
heating
plastic
press
low dielectric
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.)
Ceased
Application number
DE19762639169
Other languages
German (de)
Inventor
Martin Dipl Chem Kremzow
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.)
Polygram GmbH
Original Assignee
Polygram 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 Polygram GmbH filed Critical Polygram GmbH
Priority to DE19762639169 priority Critical patent/DE2639169A1/en
Publication of DE2639169A1 publication Critical patent/DE2639169A1/en
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/12—Dielectric heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
    • B29C33/40—Plastics, e.g. foam or rubber
    • B29C33/405—Elastomers, e.g. rubber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
    • B29C2035/0855—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using microwave
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • 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
    • B29K2883/00—Use of polymers having silicon, with or without sulfur, nitrogen, oxygen, or carbon only, in the main chain, as mould material
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Thermal Sciences (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)

Abstract

The thermoplastic discs may bear picture or sound signals. They are pressed, using high-frequency heating. The press's forming plates, which bear the new information pattern, are made of a plastic, pref. (silicon) rubber, of low dielectric loss, while the discs are made of a plastic of high dielectric loss. When previous information is erased, the HF current is continued until it has passed its mas. and is again reducing.

Description

Verfahren und Vorrichtung zum Prägen oder Pressen von scheiben-Method and device for embossing or pressing disc

förmigen Informationsträgern mittels Hochfrequenzenergie Die Erfindung bezieht sich auf ein Verfahren und eine Vorrichtung zum Prägen oder Pressen von scheibenförmigen, aus insbesondere thermoplastischem Kunststoff bestehenden Informationsträgern für Bild- und/oder Tonsignale unter Verwendung eines die Erwärmung des Trägerwerkstoffes bewirkenden Hochfrequenzgenerators, dessen Elektroden durch die Formblockhälften einer Presse gebildet sind, von denen wenigstens eine mit einer Preß-oder Prägematrize versehen ist.shaped information carriers by means of radio frequency energy The invention relates to a method and apparatus for embossing or pressing disk-shaped information carriers made in particular of thermoplastic material for image and / or sound signals using a heating of the carrier material causing high-frequency generator, the electrodes of which through the mold block halves a press are formed, of which at least one with a press or stamping die is provided.

Aus der DT-AS 1 629 681 ist eine Vorrichtung zum Prägen von Rillen in Schallplatten bekannt, bei der der zu prägende, vorzugsweise in Form einer Folienbahn ausgebildete Werkstoff zwischen die als Elektroden eines Hochfrequenzgenerators wirksamen Formhälften einer Presse eingespannt und mittels dielektrischer Hochfrequenzerwärmung entsprechend der Struktur der an den Formhälften befestigten Matrizen plastisch verformt wird. Derartige Prägevorrichtungen bringen im Vergleich zu dampfbeheizten Prägepressen insofern eine Verbesserung, als nicht mehr der gesamte Formblock erhitzt und abgekühlt werden muß, da die Wärmezufuhr im wesentlichen auf den Werkstoff beschränkt bleibt. Dennoch geht auch hier ein nicht unwesentlicher Teil der Wärmeenergie in den mit dem Trägerwerkstoff in Verbindung kommenden aus Metall bestehenden Prägematrizen verloren.From DT-AS 1 629 681 a device for embossing grooves is known in records, in which the to be embossed, preferably in the form of a film web formed material between the electrodes of a high frequency generator effective mold halves of a press clamped and by means of dielectric high-frequency heating plastic according to the structure of the dies attached to the mold halves is deformed. Such embossing devices bring compared to steam-heated Embossing presses are an improvement in that the entire mold block is no longer heated and has to be cooled, since the heat input is essentially limited to the material remain. Nevertheless, a not insignificant part of the thermal energy is also used here the metal stamping dies that come into contact with the carrier material lost.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, ein Verfahren zum Prägen von scheibenförmigen Informationsträgern zu entwickeln, das sich bei geringem Energiebedarf durch möglichst kurze Zykluszeiten auszeichnet.The present invention is based on the object of a method for the embossing of disc-shaped information carriers to develop at low energy consumption is characterized by the shortest possible cycle times.

Diese Aufgabe wird ausgehend von einem Verfahren der eingangs genannten Art erfindungsgemäß in der Weise gelöst, daß für die Matrize ein Kunststoff mit geringem dielektrischen Verlustfaktor und für den Informationsträger ein Kunststoff mit hohem dielektrischen Verlustfaktor verwendet wird. Die Verwendung einer Kunststoffmatrize mit niedrigem dielektrischen Verlustfaktor hat nämlich in vorteilhafter Weise zur Folge, daß die zugeführte Wärmeenergie nahezu ausschließlich auf den zu prägenden Werk-.This task is based on a method of the aforementioned Art according to the invention solved in such a way that a plastic with for the die low dielectric loss factor and a plastic for the information carrier with a high dielectric loss factor is used. The use of a plastic matrix with a low dielectric loss factor has namely in an advantageous manner to The result is that the heat energy supplied is almost exclusively due to the to be embossed Plant-.

stoff konzentriert wird. Nach Abschluß jeder Heizperiode setzt deshalb über die gekühlten Elektroden sofort eine rasche Kühlung des Werkstoffes ein, so daß die Zykluszeiten für jede Heiz-Kühlperiode wesentlich verkürzt werden.substance is concentrated. Therefore, after the end of each heating season Rapid cooling of the material immediately via the cooled electrodes, see above that the cycle times for each heating-cooling period are significantly reduced.

Als besonders vorteilhaft erweist sich die Verwendung von Kunstkautschuk, z. B. Siliconkautschuk, da diese Materialien einen geringen Reibwert und außerdem gute Ablöseeigenschaften von anderen Materialien besitzen.The use of synthetic rubber has proven to be particularly advantageous, z. B. silicone rubber, as these materials have a low coefficient of friction and also have good release properties from other materials.

Vorteilhafte Weiterbildungen des Erfindungsgedankens sind den Merkmalen der übrigen Unteransprüche entnehmbar.Advantageous further developments of the inventive concept are the features the remaining subclaims can be found.

Im folgenden wird die Erfindung anhand der Zeichnung näher erläutern.The invention is explained in more detail below with reference to the drawing.

Die Figur zeigt eine im Prinzip dargestellte Prägepresse mit einem unteren Preßstempel 1 und einem oberen Preßstempel 2, an denen jeweils ein Formblock 3, 4 befestigt ist. Diese Formblöcke~3, 4 bilden die-Elektroden für einen Hochfrequenzgenerator 5,-der die Heizenergie für die Prägepresse liefert. Wenigstens einer beiden Formblöcke trägt ferner eine Prägematrize 6 bzw. 7 mit einer die eingespeicherten Information entsprechenden Oberflächenstruktur. Als Material für die Matrizen 6, 7 ist ein Kunststoff mit einem geringen dielektrischen Verlustfaktor, insbesondere Kunstkautschuk, Siliconkautschuk oder dgl. vorgesehen. Dagegen wird für den Informationsträger ein Kunststoffmaterial mit hohem dielektrischen Verlustfaktor, beispielsweise Polyvinylchlorid verwendet. Eine derartige Materialauswahl bietet nämlich die Gewähr, daß die zugeführte Hochfrequenzenergie nahezu ausschließlich im Trägerwerkstoff verbraucht wird. Die Herstellung der Informationstråger erfolgt nun in der Weise, daß der vorzugsweise als Folienbahn in die Prägepresse eingeführte Werkstoff 8 unter einem Druck von z. B. 10 bis 50 atü mittels Hochfrequenzenergie bei einer Betriebsfrequenz von z. B. 13,56 MHz, 27,12 MHz oder 40,68 MHz erwärmt und anschließend nach erfolgter plastischer Verformung mittels der gekühlten Elektroden wieder abgekühlt wird. Um das Rückerinnerungsvermögen des Trägerwerkstoffs zu beseitigen, wird eine sogenannte satte HF-Prägung vorgenommen, d. h. der Trägerwerkstoff wird solange mit HF-Energie erwärmt bzw. der Hochfrequenzgenerator wird erst dann abgeschaltet, wenn die Stromaufnahme des Generators nach Erreichen eines Strommaximums wieder auf niedrigere Stromwerte zurückgegangen ist.The figure shows an embossing press shown in principle with a lower ram 1 and an upper ram 2, on each of which a mold block 3, 4 is attached. These shape blocks ~ 3, 4 form the electrodes for a high frequency generator 5, - which supplies the heating energy for the embossing press. At least one of the two mold blocks also carries an embossing die 6 or 7 with a stored information corresponding surface structure. A plastic is used as the material for the matrices 6, 7 with a low dielectric loss factor, especially synthetic rubber, Silicone rubber or the like. Provided. On the other hand, for the information carrier a Plastic material with a high dielectric loss factor, for example polyvinyl chloride used. Such a material selection offers the guarantee that the supplied High-frequency energy is almost exclusively consumed in the carrier material. the The information carrier is now produced in such a way that the preferably material 8 introduced as a film web into the embossing press under a pressure of z. B. 10 to 50 atmospheres using high frequency energy at an operating frequency of z. B. 13.56 MHz, 27.12 MHz or 40.68 MHz is heated and then after it is plastic Deformation is cooled again by means of the cooled electrodes. About the ability to remember To remove the carrier material, a so-called rich HF embossing is carried out, d. H. the carrier material is heated with HF energy or the high frequency generator is only switched off when the current consumption of the generator has been reached of a current maximum has decreased again to lower current values.

4 Patentansprüche 1 Figur4 claims 1 figure

Claims (4)

Patentanspruche 1. Verfahren zum Pressen oder Prägen von scheibenförmigen, aus insbesondere thermoplastischem Kunststoff bestehenden Informationsträger für Bild- und/oder Tonsignale unter Verwendung eines die Erwärmung des Trägerwerkstoffes bewirkenden Hochfrequenzgenerators, dessen Elektroden durch die Formblockhälften einer Presse gebildet sind, von denen wenigstens eine mit einer Preß- oder Prägematrize versehen ist, dadurch g e k e n n z e i c h n e t , daß für die Matrize ein Kunststoff mit geringem dielektrischen Verlustfaktor und für den Informationsträger ein Kunststoff mit hohem dielektrischen Verlustfaktor verwendet wird.Claims 1. Method for pressing or embossing disc-shaped, Information carriers made in particular of thermoplastic material for Image and / or sound signals using the heating of the carrier material causing high-frequency generator, the electrodes of which through the mold block halves a press are formed, of which at least one with a press or stamping die is provided, characterized in that a plastic is used for the die with a low dielectric loss factor and a plastic for the information carrier with a high dielectric loss factor is used. 2. Verfahren nach Anspruch 1, dadurch g e k e n n z e i c h -n e t , daß als MXaterial für die Matrize Kunstkautschuk, insbesondere Siliconkautschuk verwendet wird 2. The method according to claim 1, characterized in that g e k e n n z e i c h -n e t that the M material for the die is synthetic rubber, especially silicone rubber is used 3. Verfahren nach Anspruch 1 oder 2, dadurch g e k e n n -z e i c h n e t , daß der die Heizenergie liefernde Hochfrequenzgenerator bei jeder Heizperiode derart gesteuert wird, daß er erst nach überschreiten eines Strommaximums und anschließend wieder verminderter Stromaufnahme abgeschaltet wird, 3. The method according to claim 1 or 2, characterized in that g e k e n n -z e i c n e t that the high-frequency generator supplying the heating energy during each heating period is controlled in such a way that it only occurs after a current maximum has been exceeded and then reduced power consumption is switched off again, 4. Vorrichtung zur Durchführung des Verfahrens nach einem der vorhergehenden Ansprüche, g e k e n n z e i ch n e t durch eine Presse mit zwei einander zugekehrten Formhälften, die die beiden Elektroden eines im MHz-Bereich betriebenen Hochfrequenzgenerators bilden und von denen# wenigstens eine mit einer aus Kunststoff mit#geringe; dielektrischen Verlustfaktor bestehenden Matrize versehen ist.4. Device for implementation of the method according to one of the preceding claims, g e k e n n n z e i ch n e t by a press with two mold halves facing each other that hold the two electrodes a high-frequency generator operated in the MHz range and of which # at least one with one made of plastic with # low; dielectric loss factor existing Die is provided.
DE19762639169 1976-08-31 1976-08-31 Pressing information-bearing thermoplastic discs under HF heating - using pref. silicone rubber forming plates of low dielectric loss Ceased DE2639169A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19762639169 DE2639169A1 (en) 1976-08-31 1976-08-31 Pressing information-bearing thermoplastic discs under HF heating - using pref. silicone rubber forming plates of low dielectric loss

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19762639169 DE2639169A1 (en) 1976-08-31 1976-08-31 Pressing information-bearing thermoplastic discs under HF heating - using pref. silicone rubber forming plates of low dielectric loss

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DE2639169A1 true DE2639169A1 (en) 1978-03-09

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2447209A1 (en) * 1979-01-26 1980-08-22 Salomon & Fils F ASSEMBLY FOR FIXING A SHOE TO A SKI
EP0350056A2 (en) * 1988-07-08 1990-01-10 Chisso Corporation Electroconductive thermoplastic resin sheets and molded articles
EP0413975A2 (en) * 1989-08-21 1991-02-27 General Electric Company High dielectric constant material to shape electric fields for heating plastics

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2447209A1 (en) * 1979-01-26 1980-08-22 Salomon & Fils F ASSEMBLY FOR FIXING A SHOE TO A SKI
EP0350056A2 (en) * 1988-07-08 1990-01-10 Chisso Corporation Electroconductive thermoplastic resin sheets and molded articles
EP0350056A3 (en) * 1988-07-08 1991-12-27 Chisso Corporation Electroconductive thermoplastic resin sheets and molded articles
EP0413975A2 (en) * 1989-08-21 1991-02-27 General Electric Company High dielectric constant material to shape electric fields for heating plastics
EP0413975A3 (en) * 1989-08-21 1991-08-21 General Electric Company High dielectric constant material to shape electric fields for heating plastics

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8178 Suspension cancelled
8125 Change of the main classification

Ipc: B29C 3/00

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