DE1169831B - Process for, in particular, the continuous production of mica films - Google Patents

Process for, in particular, the continuous production of mica films

Info

Publication number
DE1169831B
DE1169831B DES72704A DES0072704A DE1169831B DE 1169831 B DE1169831 B DE 1169831B DE S72704 A DES72704 A DE S72704A DE S0072704 A DES0072704 A DE S0072704A DE 1169831 B DE1169831 B DE 1169831B
Authority
DE
Germany
Prior art keywords
mica
paper
creped
continuous production
web
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
DES72704A
Other languages
German (de)
Inventor
Dipl-Met Hans-Werner Rotter
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.)
Siemens AG
Original Assignee
Siemens 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
Application filed by Siemens AG filed Critical Siemens AG
Priority to DES72704A priority Critical patent/DE1169831B/en
Priority to CH28262A priority patent/CH395215A/en
Priority to FR884984A priority patent/FR1316011A/en
Priority to NL273793A priority patent/NL273793A/xx
Publication of DE1169831B publication Critical patent/DE1169831B/en
Priority to US580830A priority patent/US3660221A/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/02Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
    • H01B3/04Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances mica
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B30/00Compositions for artificial stone, not containing binders
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H13/00Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/36Inorganic fibres or flakes
    • D21H13/38Inorganic fibres or flakes siliceous
    • D21H13/44Flakes, e.g. mica, vermiculite
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00Stock material or miscellaneous articles
    • Y10S428/906Roll or coil
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/24Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24355Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]
    • Y10T428/24372Particulate matter
    • Y10T428/24421Silicon containing
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/24Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24355Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]
    • Y10T428/24446Wrinkled, creased, crinkled or creped
    • Y10T428/24455Paper
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/25Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
    • Y10T428/251Mica
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/26Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
    • Y10T428/266Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension of base or substrate
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/29Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2911Mica flake

Landscapes

  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Insulating Bodies (AREA)
  • Paper (AREA)

Description

Verfahren zur insbesondere kontinuierlichen Herstellung von Glimmerfolien Zusatz zum Patent: 1061688 Es ist bereits ein Verfahren bekannt, Glimmer so aufzuschließen, daß aus den feinsten Schüppchen Folien ähnlich einer Papierbahn hergestellt werden können. Wie aus der deutschen Patentschrift 1061688 hervorgeht, ergeben sich gegenüber der eigentlichen Papierherstellung aus faserförmigem Rohmaterial bei der analogen Verarbeitung von Glimmer, einem plättchenförmigen Material, erhebliche Schwierigkeiten und Unterschiede. Beispielsweise sind im Faserstöffpapier die Fasern immer miteinander verfilzt, wodurch bereits im nassen Zustand je nach Art und Länge der Faser eine oft erhebliche Naßfestigkeit erreicht wird. Das Papier kann deshalb noch im nassen Zustand durch Walzen, Pressen oder Stauchen verformt werden. Es kann so z. B. auch zu Kreppapier verformt werden. Dieses besitzt eine erheblich höhere Dehnbarkeit und kann so z. B. mit Vorteil zum Isolieren von Röbelstäben verwendet werden, indem man z. B. diese mit gekrepptem Papier umwickelt und mit Gießharz behandelt.Process for the, in particular, continuous production of mica foils Addition to patent: 1061688 A process is already known for breaking down mica in such a way that foils similar to a paper web can be produced from the finest flakes. As can be seen from the German patent specification 1061688, there are considerable difficulties and differences compared to the actual paper production from fibrous raw material in the analog processing of mica, a platelet-shaped material. For example, in the fibrous paper the fibers are always felted together, which means that even when wet, depending on the type and length of the fiber, an often considerable wet strength is achieved. The paper can therefore be deformed by rolling, pressing or upsetting while it is still wet. It can be B. can also be deformed to crepe paper. This has a significantly higher elasticity and can be so z. B. can be used with advantage to isolate Röbelstäben by z. B. these wrapped with creped paper and treated with resin.

Bei zahlreichen elektrischen Isolierungen muß aber Glimmer verwendet bzw. mitverwendet werden. Glimmersplittings, wie sie bei der Herstellung von Mikafolium, einem Zellulosepapier von 30 bis 50 g/m2, das mit einer oder zwei Lagen Spaltglimmer beklebt und mit einer Bindemittelschicht versehen ist, Anwendung finden, neigen stets zum Aufspalten, was besonders bei Hochspannungswicklungen nachteilig ist. Glimmerfolie weist diese Nachteile nicht auf, hat aber keine genügend große Dehnung und kann so nur schwer verarbeitet bzw. verformt werden. Eine Verformung der nassen Glimmerfolie durch mechanische Verfarmungsmethoden ist nicht möglich, da es bei der Verarbeitung von Glimmerflittern zu Glimmerfolie nicht zu einer Verfilzung kommt. Es tritt ein bei der Trocknung wirksam werdender Verklebungseffekt ein. Im nassen Zustand liegt keine Festigkeit (Naßfestigkeit=0 kg/mm2) und in trockenem Zustand liegt eine relativ hohe Festigkeit (Trockenfestigkeit = 3 kg/mm2) vor. Eine Formgebung der nassen Glimmerfolie durch die bekannten Verformungsmethoden ist nicht möglich.However, mica must be used for numerous electrical insulations or be used as well. Mica splits, as used in the production of mikafolium, a cellulose paper of 30 to 50 g / m2, with one or two layers of split mica is pasted and provided with a binder layer, tend to find application always to split, which is particularly disadvantageous with high-voltage windings. Mica foil does not have these disadvantages, but does not have a sufficiently great elongation and can therefore only be processed or deformed with difficulty. A deformation of the wet Mica foil by mechanical impoverishment methods is not possible because it is at the processing of mica flakes into mica foil does not result in matting. A bonding effect occurs which becomes effective during drying. In the wet State has no strength (wet strength = 0 kg / mm2) and is dry there is a relatively high strength (dry strength = 3 kg / mm2). A shaping the wet mica foil by the known deformation methods is not possible.

Die Herstellung von Glimmerfolien durch Absaugen einer Glimmersuspension auf einer über einen Siebkörper gelegten Papier- oder Gewebebahn ist in dem deutschen Patent 1061688 beschrieben.The production of mica films by suctioning off a mica suspension on a web of paper or fabric laid over a screen body is in the German Patent 1061688.

Es wurde gefunden, daß man eine Glimmerfolie hoher Festigkeit und Dehnung erhalten kann, insbesondere auch eine gekreppte Glimmerfolie, wenn man an Stelle des normalen Papiers gekreppte Faserpapier- oder Gewebebahnen verwendet. Die Glimmerflocken setzen sich auf der verwendeten Bahn ab und passen sich an deren Falten an. Die beispielsweise auf dem Kreppapier befiwliche Glimmerfolie wird getrocknet und kann abgezgten werden. Die abgezogene Glimmerfolie hat die gleiche Beschaffenheit wie die Unterlage. So ist es beispielsweise gekreppt bei Verwendung einer gekreppten Bahn. Als Unterlage können gekreppte Papier- und Gewebebahnen verwendet werden. Die gemäß der Erfindung erhaltene gekreppte Glimrnerfolie kann für sich oder auch zusammen mit der Papier- oder Gewebeunterlage weiterverarbeitet werden.It has been found that a mica sheet of high strength and Elongation can be obtained, especially a creped mica sheet, if one is on Creped fiber paper or fabric webs are used instead of normal paper. The mica flakes settle on the web used and adapt to it Wrinkles on. The mica film, for example on the crepe paper, is dried and can be deducted. The peeled off mica film has the same texture like the pad. For example, it is creped when using a creped one Train. Creped paper and fabric webs can be used as a base. The creped mica film obtained according to the invention can either by itself or as well can be further processed together with the paper or fabric backing.

Die Erfindung wird durch die folgenden Ausführungsbeispiele erläutert: Beispiel 1 Auf eine Siebunterlage von z. B. 300 . 1000 mm wird eine Bahn gekrepptes Filterpapier aufgelegt und durch Anfeuchten und Ansaugen dicht mit der Siebunterlage verbunden. Darauf wird eine stark mit Wasser verdünnte Glimmerpulpe von etwa 25 g Festkörper im Liter aufgeschüttet. Die Glimmerflitter verteilen sich gleichmäßig über die gekreppte Papierbahn und setzen sich auf dieser unter Unterdruck stehenden Papierbahn an den durch die Kreppung vorgegebenen Erhebungen und Vertiefungen in gleichmäßiger Verteilung fest. Das gekreppte Papier einschließlich der aufgesaugten Glimmermasse wird dann von der Siebunterlage abgehoben, auf ein Trokkenblech in fünfzig bis sechzig Lagen übereinander abgelegt und in einer Trockenpresse bei 140° C innerhalb 2 Stunden getrocknet. Daraufhin können die Glimmerbahnen jetzt als ebenfalls gekreppte Folie von der Unterlage abgezogen oder mit dieser weiterverarbeitet werden.The invention is illustrated by the following exemplary embodiments: Example 1 On a sieve pad of z. B. 300. 1000 mm a web is creped Filter paper placed on top and sealed with the sieve pad by moistening and sucking in tied together. A mica pulp of about 25 g solids poured into the liter. The mica flakes are distributed evenly over the creped paper web and sit on it under negative pressure Paper web at the elevations and depressions given by the creping evenly distributed. The creped paper including the absorbed Mica mass is then lifted off the sieve pad on a drying plate in Fifty to sixty layers placed on top of each other and placed in a drying press at 140 ° C dried within 2 hours. Then the mica tracks now peeled off as a creped film from the base or with it are further processed.

Beispiel 2 Von einem umlaufenden Langsieb wird eine gekreppte endlose Bahn aus Papier oder Gewebe angesaugt und dadurch mitbefördert. Auf diese Bahn, die unter leichtem Unterdruck steht, wird in gleichmäßigem Zufluß eine Glimmerpulpe von 20 bis 30 g Festkörper pro Liter aufgetragen. Infolge des Unterdruckes werden die Glimmerteilchen unter Beibehaltung der Unebenheiten der Unterlage fest angesaugt. Die endlose Papier- oder Gewebebahn wird an der Umkehrung des Langsiebes von diesem abgehoben und durch eine Trockenstrecke geführt, bis die neu gebildete gekreppte Glimmerfolie so trocken und fest ist, daß sie von der Unterlage abgehoben und aufgerollt werden kann. Die Stärke der Glimmerfolien wird mit der Umlaufgeschwindigkeit des Langsiebes eingestellt. Bei geringer Geschwindigkeit wird pro Flächeneinheit mehr Glimmer aufgetragen. Diese dickere Schicht benötigt aber auch eine längere Verweilzeit in der Trockenstrecke.Example 2 A rotating Fourdrinier wire becomes a creped endless wire Paper or fabric web is sucked in and transported along with it. On this track which is under a slight negative pressure, becomes a mica pulp in a steady influx applied from 20 to 30 g solids per liter. As a result of the negative pressure the mica particles are firmly sucked in while maintaining the unevenness of the base. The endless paper or fabric web is attached to the reversal of the Fourdrinier wire lifted off and passed through a drying section until the newly formed creped Mica foil is so dry and firm that it is lifted off the surface and rolled up can be. The strength of the mica film is determined by the speed of rotation of the Fourdrinier set. At low speeds, more is per unit area Mica applied. However, this thicker layer also requires a longer dwell time in the drying section.

Die gemäß der Erfindung erhaltenen Glimmerfolien, z. B. gekrepptes Glimmerpapier, können unmittelbar auf zu isolierende Teile aufgewickelt und z. B. unter Vakuum mit Gießharz od. dgl. imprägniert werden. Sie können aber auch mit einem Imprägnier- und Bindemittel, wie z. B. Siliconharz, Schellack, Epoxydharz, imprägniert werden, und dann zu Formkörpern gewickelt oder zu Platten aufeinandergelegt und unter Druck heiß gehärtet werden.The mica films obtained according to the invention, e.g. B. creped Mica paper can be wound directly onto parts to be isolated and z. B. Impregnated under vacuum with casting resin or the like. But you can also use an impregnation and binding agent, such as. B. silicone resin, shellac, epoxy resin, are impregnated, and then wound into molded bodies or placed on top of one another to form sheets and hot hardened under pressure.

Wickel, welche mit der gemäß der Erfindung hergestellten gekreppten Glimmerfolie hergestellt sind, weisen eine bessere Anpassungsfähigkeit an die zu umwickelnden Formkörper auf. Ein besonderer Vorteil ist ferner, daß bei der Herstellung von Schichtkörpern unter Verwendung von gekreppter Glimmerfolie eine bessere Verbindung von Schicht zu Schicht erhalten wird als bei der Verwendung von glattem Papier.Coils made with the creped made according to the invention Mica foil are made, exhibit better adaptability to the wrapping molded body on. Another particular advantage is that during manufacture of laminated bodies using creped mica foil a better connection is obtained from layer to layer than when using smooth paper.

Claims (1)

Patentanspruch: Verfahren zur insbesondere kontinuierlichen Herstellung von Glimmerfolien nach Patent 1061688, dadurch gekennzeichnet, da,ß man eine Glimmersuspension auf eine gekreppte Faserpapier- oder Gewebebahn aufträgt und nachfolgend, gegebenenfalls nach dem Ablösen von der Unterlage, trocknet.Claim: Process for, in particular, continuous production of mica foils according to patent 1061688, characterized in that there is a mica suspension on a creped fiber paper or fabric web and then, if necessary after detaching from the base, dries.
DES72704A 1953-07-20 1961-02-24 Process for, in particular, the continuous production of mica films Pending DE1169831B (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DES72704A DE1169831B (en) 1961-02-24 1961-02-24 Process for, in particular, the continuous production of mica films
CH28262A CH395215A (en) 1961-02-24 1962-01-10 Process for producing a mica film and mica film produced by this process
FR884984A FR1316011A (en) 1961-02-24 1962-01-16 Process for the continuous production of mica films
NL273793A NL273793A (en) 1953-07-20 1962-01-22
US580830A US3660221A (en) 1961-02-24 1966-09-20 Stretchable creped mica foil and method therefor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DES72704A DE1169831B (en) 1961-02-24 1961-02-24 Process for, in particular, the continuous production of mica films

Publications (1)

Publication Number Publication Date
DE1169831B true DE1169831B (en) 1964-05-06

Family

ID=7503406

Family Applications (1)

Application Number Title Priority Date Filing Date
DES72704A Pending DE1169831B (en) 1953-07-20 1961-02-24 Process for, in particular, the continuous production of mica films

Country Status (4)

Country Link
US (1) US3660221A (en)
CH (1) CH395215A (en)
DE (1) DE1169831B (en)
FR (1) FR1316011A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2493828A1 (en) * 1980-11-08 1982-05-14 Hitachi Chemical Co Ltd MATERIALS IN MICA RECONSTITUTED, MATERIALS PRE-IMPREGNATED IN MICA RECONSTITUTED, PRODUCTS IN MICA RECONSTITUTED AND ISOLATED WINDINGS

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040051208A1 (en) * 2002-09-17 2004-03-18 Sara Creekmore Process for forming foil

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2077438A (en) * 1934-07-19 1937-04-20 Paper Service Co Coated creped fabric and article and process of making it
US2763315A (en) * 1950-05-10 1956-09-18 Westinghouse Electric Corp Flexible bonded mica insulation
DE1061688B (en) * 1953-07-20 1959-07-16 Siemens Ag Process for, in particular, the continuous production of mica films
US3101845A (en) * 1960-09-26 1963-08-27 Minnesota Mining & Mfg Stretchable mica-containing insulating sheet materials and products insulated therewith

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2493828A1 (en) * 1980-11-08 1982-05-14 Hitachi Chemical Co Ltd MATERIALS IN MICA RECONSTITUTED, MATERIALS PRE-IMPREGNATED IN MICA RECONSTITUTED, PRODUCTS IN MICA RECONSTITUTED AND ISOLATED WINDINGS

Also Published As

Publication number Publication date
US3660221A (en) 1972-05-02
CH395215A (en) 1965-07-15
FR1316011A (en) 1963-01-25

Similar Documents

Publication Publication Date Title
DE2342811C3 (en) Method and device for the production of a multilayer paper or cardboard web
AT390396B (en) METHOD FOR PRODUCING A PLANT-SHAPED PLASTIC RESIN HIGH-PRESSURE MOLDED PART, AND PRE-PRODUCT FOR USE IN SUCH A METHOD
CH623095A5 (en) Process for producing a multi-ply composite paper
DE1169831B (en) Process for, in particular, the continuous production of mica films
DE2815451A1 (en) OIL-IMPRAEGNABLE INSULATING CARDBOARD AND METHOD FOR MANUFACTURING IT
EP0464470B1 (en) Crêpe paper, process for making the same, and use
DE2166448C3 (en) Printed circuit board base material and process for its manufacture
DE1504292B2 (en) INSULATING MATERIAL
DE866549C (en) Process for the production of composite panels from inorganic fiber materials
DE1081091B (en) Process for the production of layered insulation strips from mica pulp
DE908066C (en) Process for the production of a layer-free electrical insulating material
DE2550768C2 (en) Process for the production of a decorative laminate board
DE2505647C2 (en) Process for the production of cellulosic materials, cellulosic materials and their use
DE2444718C3 (en) Speaker cone
DE751173C (en) Process for the production of leather substitutes
DE638593C (en) Process for the production of a sheet-shaped material consisting of cork particles and fibrous material and multi-layer covering material produced according to this process
DE1504397B1 (en) Process for the production of a casting tape with a pattern on the surface
DE1569940C3 (en) Use of an impregnated, compressed paper as a carrier film in adhesive strips
DE2602438C3 (en) Process for the production of a prepreg
DE1704065C (en) Process for demolding objects made of synthetic resins
DE1504292C (en) insulating material
AT135348B (en) Process for the production of oil-proof electrical insulation material.
AT236766B (en) Process for the production of paper or paper-like webs on a paper machine from aqueous fiber dispersions
DE1192397B (en) Method for producing a diaphragm, in particular a separator for electrical accumulators
DE2444718A1 (en) MEMBRANES FOR ELECTROACOUSTIC DEVICES