DE2053194A1 - Process for applying magnetizable, binder-containing layers to a carrier film - Google Patents

Process for applying magnetizable, binder-containing layers to a carrier film

Info

Publication number
DE2053194A1
DE2053194A1 DE19702053194 DE2053194A DE2053194A1 DE 2053194 A1 DE2053194 A1 DE 2053194A1 DE 19702053194 DE19702053194 DE 19702053194 DE 2053194 A DE2053194 A DE 2053194A DE 2053194 A1 DE2053194 A1 DE 2053194A1
Authority
DE
Germany
Prior art keywords
carrier film
binder
magnetizable
containing layers
edge
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.)
Pending
Application number
DE19702053194
Other languages
German (de)
Inventor
Fritz 8021 Neuried; Herrmann Kurt Dr.phil. 8023 Pullach; Pertzsch Albert Dipl.-Ing. 8000 München; Wilke Werner Dr.-Ing. 8130 Starnberg Ankenbrand
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.)
Agfa Gevaert AG
Original Assignee
Agfa Gevaert AG
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
Priority claimed from DE1907212A external-priority patent/DE1907212B2/en
Application filed by Agfa Gevaert AG filed Critical Agfa Gevaert AG
Priority to DE19702053194 priority Critical patent/DE2053194A1/en
Priority to CH1029171A priority patent/CH527649A/en
Priority to NL7114752A priority patent/NL7114752A/xx
Priority to GB4989671A priority patent/GB1326979A/en
Priority to BE774664A priority patent/BE774664R/en
Priority to FR7139091A priority patent/FR2111928B2/fr
Publication of DE2053194A1 publication Critical patent/DE2053194A1/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/84—Processes or apparatus specially adapted for manufacturing record carriers
    • G11B5/848—Coating a support with a magnetic layer by extrusion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/26—Processes for applying liquids or other fluent materials performed by applying the liquid or other fluent material from an outlet device in contact with, or almost in contact with, the surface
    • B05D1/265—Extrusion coatings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/20—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by magnetic fields
    • B05D3/203—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by magnetic fields pre-treatment by magnetic fields
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/911—Cooling
    • B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/911—Cooling
    • B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
    • B29C48/9145—Endless cooling belts
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/911—Cooling
    • B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
    • B29C48/915—Cooling of flat articles, e.g. using specially adapted supporting means with means for improving the adhesion to the supporting means
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/74—Record carriers characterised by the form, e.g. sheet shaped to wrap around a drum

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Coating Apparatus (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)

Description

AG 726 AGFA-GEVAERT AKTIEKGESELLSCHAFT, Leverkusen 7. 10. 70AG 726 AGFA-GEVAERT AKTIEKGESELLSCHAFT, Leverkusen 7. 10. 70

Verfahren zum Auftragen magnetisierbarer, bindemittelhaltiger Schichten auf eine Trägerfolie ; ; _ Process for applying magnetizable, binder-containing layers to a carrier film ; ; _

Zusatz zu Patent ......... (Patentanmeldung P I0907 212.9)Addendum to patent ......... (patent application PI 0 907 212.9)

Die Erfindung betrifft ein Verfahren zum Auftragen magnetisierbarer, bindemittelhaltiger Schichten auf eine Trägerfolie mit einem Extrudergießer aus nichtferromagnetischem Werkstoff, bei dem der ExtruderÖffnung eine magnetisierbare Kante gegenübersteht, über die die Folie gleitet und in Feldrichtung bei einer Feldstärke von 100 bis 500 Oe abläuft, wobei die Feldstärke an der Kante über 700 Oe beträgt und einen Gradienten von mehr als 500 Oe/cm aufweist, nach Patent ,«....,*.. (Patentanmeldung' P 1.907 212.9).The invention relates to a method for applying magnetizable, binder-containing layers on a carrier film with an extruder caster made of non-ferromagnetic material opposite the extruder opening is a magnetizable edge, over which the film slides and runs in the direction of the field at a field strength of 100 to 500 Oe, the field strength on the edge is over 700 Oe and has a gradient of more than 500 Oe / cm, according to patent, "...., * .. (patent application" P 1.907 212.9).

Dieses Verfahren bietet bereits gegenüber bisher bekannten Verfahren eine Reihe bedeutender, für die Qualität von Magnettonbändern und deren wirtschaftliche Fertigung entscheidender Vorteile. So kann der Abstand zwischen der Austrittsöffnung des Düsenspalts einer Breitschlitzdüse und der Trägerfolie sehr groß, nämlich >1 mm gehalten sein, wodurch beispielsweise bei einer kontinuierlichen Beschichtung ein Durchfahren von Klebestellen ohne jegliche Schwierigkeit möglich ist. Das Verfahren erlaubt die Verwendung eines relativ dicken Düsenspalts und eine Streckung des aus dem Düsenspalt austretenden Flüssigkeitsfilms um mehr als das 3Ofache, so daß die Auswirkung von Schwankungen in der Weite des Düsenspalts auf die Schichtdicke weitgehend vermieden ist, Es können Gießgeschwindigkeiten von etwa 100 bis 200 m/min gefahren werden, ohne daß der schichtbildende Flüssigkeitsmeniskus labil bzw. störanfällig wird.This method already offers the previously known method a number of significant advantages that are decisive for the quality of magnetic tapes and their economical production. Thus, the distance between the outlet opening of the nozzle gap of a slot nozzle and the carrier film can be very large large, namely> 1 mm, which means that, for example, in the case of continuous coating, gluing points are passed through is possible without any difficulty. The method allows the use of a relatively thick nozzle gap and an elongation of the liquid film emerging from the nozzle gap by more than 30 times, so that the effect of Fluctuations in the width of the nozzle gap on the layer thickness is largely avoided about 100 to 200 m / min can be driven without the layer-forming Fluid meniscus becomes unstable or susceptible to failure.

—2——2—

20981 97 10S320981 97 10S3

J - 2' - AG 726J - 2 '- AG 726

AGFA-GEVAERT AG, Leverkusen .. 7. 10. 70AGFA-GEVAERT AG, Leverkusen .. 7. 10. 70

Bei der Anwendung des zuvor behandelten Verfahrens hat sich neben den zahlreichen Vorteilen gezeigt, daß bei einer konstanten Schichtdicke in Laufrichtung der Bahn Schwankungen der Schichtdicke quer zur Laufrichtung auftreten können, die auf eine bei SOfacher Vergrösserung deutlich erkennbare Längsstruktur zurückzuführen sind. Diese Dickenschwan^· kungen sind nachteilig.When applying the previously discussed procedure has in addition to the numerous advantages shown that at a constant Layer thickness in the running direction of the web Fluctuations in the layer thickness across the running direction can occur, which can be clearly seen at 50x magnification Longitudinal structure are attributable. This Thick Swan ^ · effects are disadvantageous.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren der eingangs beschriebenen Art bereitzustellen, bei dem der zuvor herausgestellte Nachteil vermieden ist, das also eine gleichmäßige- Beschichtung der Trägerfolie sowohl in Laufrichtung wie auch quer dazu ermöglicht.The invention is based on the object of a method of the type described at the outset to be provided, in which the disadvantage pointed out above is avoided, that is to say enables a uniform coating of the carrier film both in the running direction and across it.

Bei einem Verfahren zum Auftragen magnetisierbarer, bindemittelhaltiger Schichten auf eine Trägerfolie mit einem Extrudergießer aus nicht ferromagnetischem Werkstoff, bei dem der Extruderöffnung eine magnetisierbare Kante gegenübersteht, über die die Folie gleitet und in Feldrichtung bei einer Feldstärke von 100 bis 500 Oe abläuft, wobei die Feldstärke an der Kante über 700 Oe beträgt und einen Gradienten von mehr als 500 Oe/cm aufweist, nach Patent ..... . . .. (Patentanmeldung P 1.907.212.9) ist die Auf-In a method for applying magnetizable, binder-containing layers to a carrier film with an extruder caster made of non-ferromagnetic material, in which the extruder opening is opposite a magnetizable edge over which the film slides and runs in the direction of the field at a field strength of 100 to 500 Oe, the field strength at the edge is over 700 Oe and has a gradient of more than 500 Oe / cm, according to patent ...... . .. (patent application P 1.907.212.9) is the

TiTi

gäbe erfinduhgsgemäß dadurch gelöst, daß die Dispersion zwischen der Zuflußzoiie und dem Düsenspalt im Kanal des Schlitzgießers mindestens um eine scharfe Kante geführt wird. Hierdurch wird eine Mischbewegüng erzeugt, die zu einer sehr weitgehenden Vergleichmäßigung der aus der Düsenöffnung austretenden Dispersion senkrecht zu deren Fließrichtung und damit einer Vergleichniäßigung der Dicke der Beschichtung auch senkrecht zu der Laufrichtung der Trägerfolie führen.would be solved according to the invention in that the dispersion between the influx zone and the nozzle gap in the channel of the Schlitzgießers is guided at least around a sharp edge. This creates a mixed movement that leads to a very extensive homogenization of the dispersion emerging from the nozzle opening perpendicular to its direction of flow and thus a comparison of the thickness of the coating also run perpendicular to the running direction of the carrier film.

209819/1053209819/1053

:.-.- Λ;-.' - 205319A:.-.- Λ; -. ' - 205319A

St- #"*- AG 726 St- # "* - AG 726

AGFA-GEVAERTAG, Leverkusen . 7. 10. 70AGFA-GEVAERTAG, Leverkusen. 7. 10. 70

In der Zeichnung ist das Wesen der Erfindung veranschaulicht. Gezeigt ist - in schematischer Darstellung - eine Einrichtung zur Ausübung des erfindungsgemäßen VerfahrensThe essence of the invention is illustrated in the drawing. What is shown - in a schematic representation - is a device for carrying out the method according to the invention

Die Einrichtung besteht aus zwei Walzen 1, einem (Permanent- oder Elektro-) Magneten 2 und einer Breitschlitzdüse 3, die mittels eines nicht weiter dargestellten Extruders mit einer Dispersion 4a, einer meist hochviskosen Magnettongießlösung, beschickt ist. Die Walzen 1 und der Magnet 2 sind so zueinander angeordnet, daß eine über die Walzen 1 laufende Trägerfolie 5 über eine der Polflächen 21 des Magneten 2 gleitet. Die Breitschlitzdüse -3 ist gegenüber dem Magneten 2 so eingestellt, daß dessen einer,, in Laufrichtung a der Trägerfolie 5 weisenden Kante 22 die an den Düsenspalt 31 anschließende Düsenöffnung 32 gegenübersteht. Die Feldstärke des Magneten 2 beträgt an der Kante 22 mehr als 700 Oe.The device consists of two rollers 1, one (permanent or electro) magnets 2 and a slot die 3, which by means of an extruder not shown with a Dispersion 4a, a mostly highly viscous magnetic clay casting solution, is charged. The rollers 1 and the magnet 2 are so to each other arranged that a carrier film 5 running over the rollers 1 slides over one of the pole faces 21 of the magnet 2. the The slot nozzle -3 is set in relation to the magnet 2 in such a way that its one, pointing in the direction of travel a of the carrier film 5 Edge 22 is the nozzle opening adjoining the nozzle gap 31 32 faces. The field strength of the magnet 2 is more than 700 Oe at the edge 22.

Bis dahin entspricht die-Wirkungsweise der in der deutschen Patentschrift-. . ...... (Patentanmeldung P 1.907 212.9). beschriebenen.Until then, the mode of action corresponds to that in German Patent specification-. . ...... (patent application P 1.907 212.9). described.

In der Breitschlitzdüse 3 ist zwischen der Zuflußzone 33 und der Düsenöffnung 32 bzw. dem Düsenspalt 31 eine Seite des Düsenkanals mit einem sägezahnartigen Profil ausgestattet ist, wodurch erweiternde und verengende Abschnitte 34, 35 entstehen.In the slot nozzle 3 is one side of the nozzle channel between the inflow zone 33 and the nozzle opening 32 or the nozzle gap 31 is equipped with a sawtooth-like profile, whereby widening and narrowing sections 34, 35 arise.

Hierdurch wird bei dem Verfahren die Dispersion ^a vor Austritt aus dem Düsenspalt 31 mehrmals um scharfe Kanten umgelenkt, so daß in der Dispersion 4a eine Mischbewegung erzeugt wird. Dies führt zu einer sehr weitgehenden Vergleichmäßigung des Schichtauftrages sowohl in Laufrichtung als auch quer dazu. As a result, in the process, the dispersion ^ a before it emerges deflected several times around sharp edges from the nozzle gap 31, so that a mixing movement is generated in the dispersion 4a will. This leads to a very extensive equalization of the layer application both in the running direction and across it.

-4--4-

209819/1053209819/1053

- 4 ~ AG 726- 4 ~ AG 726

AGFA-GEVAERT, AG.,. Leverkusen · . ,, , , .. . . 7..- 10. ^C> , Α r /AGFA-GEVAERT, AG.,. Leverkusen · . ,,,, ... . 7 ..- 10. ^ C>, Α r /

Die Ausführung der sich, erweiternden und verengenden Ab- . schnitte ist nicht an das in der Zeichnung gezeigte Bei-,
spiel gebunden„ Wesentlich ist lediglich, daß die Dispersion in Fließrichtung durch einen Kanal um scharfe Kanten umgelenkt wird. So kann der. Düsenkanal nicht nur an einer Begrenzungsfläche, sondern an beiden sägezahnartig ausgebildet sein.The execution of the expanding, expanding and narrowing. cuts is not compatible with what is shown in the drawing,
tied to play “It is only essential that the dispersion is deflected in the direction of flow through a channel around sharp edges. So can he. The nozzle channel can be designed in a sawtooth-like manner not only on one boundary surface, but also on both.

- Patentansprüche 2098 19/1053- Claims 2098 19/1053

Claims (2)

AG -726AG -726 AGFA-GEMEHT. AG,. Leverkusen 7, 10. 70AGFA-MADE. AG ,. Leverkusen 7, 10. 70 Patentansprüche:Patent claims: Verfahren zum Auftragen magnetisierbarer, bindemittelhalt iger Schichten auf eine Trägerfolie mit einem Extrudergießer aus nicht ferromagnetischem Werkstoff, bei dem der Extruderöffnung eine magnetisierbar Kante gegenübersteht, Über die die Folie gleitet und in Feldrichtung bei einer Feldstärke von 100 bis 500 Oe abläuft, wobei die Feldstärke an der Kante über 700 Oe beträgt und einen Gradienten.von mehr als 500 Oe/cm. aufweist, nach Patent , . .... . . . (Patentanmeldung P 1.907 212.9), i dadurch gekennzeichnet, daß die Dispersion zwischen Zuflußzone und Düsenspalt im Kanal des Gießers mindestens um eine scharfe Kante geführt wird.Process for applying magnetizable, binder-containing layers to a carrier film with an extruder caster made of non-ferromagnetic material, in which the extruder opening is facing a magnetizable edge, over which the film slides and runs in the direction of the field at a field strength of 100 to 500 Oe, the field strength on the edge is over 700 Oe and a gradient of more than 500 Oe / cm. has, according to patent,. .... . . (Patent application P 1.907 212.9), i characterized in that the dispersion between the inflow zone and nozzle gap in the channel of the caster is guided at least around a sharp edge. 2. Verfahren nach Anspruch 1 dadurch gekennzeichnet, daß die Dispersion durch einen Kanal geführt wird, dessen eine Begrenzungsfläche sägezahnartig ausgebildet ist.2. The method according to claim 1, characterized in that the dispersion is passed through a channel, one boundary surface of which is sawtooth-like. 209819/1053209819/1053 L e e r s e i t eL e r s e i t e
DE19702053194 1969-02-13 1970-10-29 Process for applying magnetizable, binder-containing layers to a carrier film Pending DE2053194A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
DE19702053194 DE2053194A1 (en) 1969-02-13 1970-10-29 Process for applying magnetizable, binder-containing layers to a carrier film
CH1029171A CH527649A (en) 1969-02-13 1971-07-13 Process for applying magnetizable, binder-containing layers to a carrier film
NL7114752A NL7114752A (en) 1969-02-13 1971-10-26
GB4989671A GB1326979A (en) 1969-02-13 1971-10-27 Method of and apparatus for producing magnetic recording tapes
BE774664A BE774664R (en) 1969-02-13 1971-10-29 METHOD OF MANUFACTURE OF MAGNETIC TAPE BY MEANS
FR7139091A FR2111928B2 (en) 1969-02-13 1971-10-29

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1907212A DE1907212B2 (en) 1969-02-13 1969-02-13 Process for applying magnetizable binder-containing layers to a carrier film with an extruder caster
DE19702053194 DE2053194A1 (en) 1969-02-13 1970-10-29 Process for applying magnetizable, binder-containing layers to a carrier film

Publications (1)

Publication Number Publication Date
DE2053194A1 true DE2053194A1 (en) 1972-05-04

Family

ID=25756992

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19702053194 Pending DE2053194A1 (en) 1969-02-13 1970-10-29 Process for applying magnetizable, binder-containing layers to a carrier film

Country Status (5)

Country Link
BE (1) BE774664R (en)
DE (1) DE2053194A1 (en)
FR (1) FR2111928B2 (en)
GB (1) GB1326979A (en)
NL (1) NL7114752A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4226139A1 (en) * 1992-08-07 1994-02-10 Basf Magnetics Gmbh Coating system for producing a magnetic recording tape - comprises a multi-slot extruder caster arranged to coat a moving film base with a magnetic multilayer which is exposed to a magnetic field
DE4234608A1 (en) * 1992-08-07 1994-04-21 Basf Magnetics Gmbh Magnetic recording material prodn. - by wet-wet co-extrusion casting on a film base with magnet behind, to give a thick upper magnetic layer and a thin lower non-magnetic layer

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115921222B (en) * 2022-09-07 2023-11-28 常州铭赛机器人科技股份有限公司 Glue outlet control method of screw valve

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4226139A1 (en) * 1992-08-07 1994-02-10 Basf Magnetics Gmbh Coating system for producing a magnetic recording tape - comprises a multi-slot extruder caster arranged to coat a moving film base with a magnetic multilayer which is exposed to a magnetic field
DE4234608A1 (en) * 1992-08-07 1994-04-21 Basf Magnetics Gmbh Magnetic recording material prodn. - by wet-wet co-extrusion casting on a film base with magnet behind, to give a thick upper magnetic layer and a thin lower non-magnetic layer

Also Published As

Publication number Publication date
BE774664R (en) 1972-05-02
FR2111928A2 (en) 1972-06-09
FR2111928B2 (en) 1976-02-13
NL7114752A (en) 1972-04-25
GB1326979A (en) 1973-08-15

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