DE499897C - Process for the production of unbreakable, washable, black writing boards for stylus writing - Google Patents

Process for the production of unbreakable, washable, black writing boards for stylus writing

Info

Publication number
DE499897C
DE499897C DET36228D DET0036228D DE499897C DE 499897 C DE499897 C DE 499897C DE T36228 D DET36228 D DE T36228D DE T0036228 D DET0036228 D DE T0036228D DE 499897 C DE499897 C DE 499897C
Authority
DE
Germany
Prior art keywords
writing
black
unbreakable
washable
production
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.)
Expired
Application number
DET36228D
Other languages
German (de)
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.)
TABULA FABRIKATION U GmbH
Original Assignee
TABULA FABRIKATION U 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 TABULA FABRIKATION U GmbH filed Critical TABULA FABRIKATION U GmbH
Priority to DET36228D priority Critical patent/DE499897C/en
Application granted granted Critical
Publication of DE499897C publication Critical patent/DE499897C/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
    • B43L1/00—Repeatedly-usable boards or tablets for writing or drawing
    • B43L1/02—Slates

Landscapes

  • Drawing Aids And Blackboards (AREA)

Description

Verfahren zur Herstellung unzerbrechlicher, abwaschbarer, schwarzer Schreibtafeln für Griffelschrift Zur Herstellung unzerbrechlicher, abwaschbarer, schwarzer Schreibtafeln für Griffelschrift sind Verfahren bekannt, bei welchen eine Unterlage aus Karton, Pappe, Holz, Blech o. dgl. mit einer Deckschicht überzogen wird:, welche Schiefer- und Schmirgelpulver sowie schwarzen Farbstoff enthält. Alle diese Verfahren sind umständlich, zeitraubend und teuer und eignen sich nicht zur Massenherstellung von Schreibtafeln.Process for making unbreakable, washable, black Writing boards for stylus writing For the production of unbreakable, washable, black writing boards for stylus writing methods are known in which a Base made of cardboard, cardboard, wood, sheet metal or the like. Covered with a top layer is: which contains slate and emery powder as well as black dye. All these methods are cumbersome, time consuming and expensive and are not suitable for Mass production of writing boards.

Diese Nachteile zu vermeiden, ist das Ziel der vorliegenden Erfindung.The aim of the present invention is to avoid these disadvantages.

Dieselbe besteht im wesentlichen darin, daß die in bekannter Weise Schiefer- uri;d Schmirgelpulver sowie schwarzen Farbstoff enthaltende Deckschicht unter gleichzeitigem Zusatz von feinstkörnigem Magnesitpulver mit Harzöl angerieben wird.The same essentially consists in that in a known manner Schiefer- uri; d emery powder as well as a top layer containing black dye rubbed with resin oil with the simultaneous addition of fine-grain magnesite powder will.

Die so hergestellte Deckschicht wird in einem einzigen, Arbeitsgang auf die Unterlage aufgebracht und zeichnet sich vorteilhaft dadurch aus, daß sie rasch abbindet und trocknet.The top layer produced in this way is made in a single operation applied to the base and is advantageously characterized in that it sets and dries quickly.

Zur Ausführung des Verfahrens verwendet man vorteilhaft io Teile Magnesit, 3o Teile Schiefer, 15 Teile Schmirgel, 2o Teile Rebschwarz und 25 Teile Harzöl.To carry out the process, it is advantageous to use 10 parts of magnesite, 30 parts of slate, 15 parts of emery, 20 parts of black vine and 25 parts of resin oil.

Hierbei werden. die feinstgekörnten Pulver des Magnesits, des Schiefers, des Schmirgels und der schwarzen Farbe in der Mischmaschine trocken gemischt; die Mischung wird sodann mit dem Harzölzusatz versehen und in der Farbmühle mit demselben feinstens verrieben. Das Aufbringen der geschilderten Masse auf die aus Karton, Pappe, Holz, Blech usw. bestehende Unterlage Rann auf verschiedene Art geschehen, z. B. mittels Pinsels oder Spachtels, durch Eintauchen der Unterlage in die Masse, durch Aufspritzen oder Aufwalzen der letzteren.Here will be. the finest-grained powders of magnesite, slate, the emery and black paint dry mixed in the blender; the Mixture is then provided with the resin oil additive and in the paint mill with the same finely rubbed. The application of the described mass on the cardboard, Cardboard, wood, sheet metal, etc. existing underlay can be done in different ways, z. B. by means of a brush or spatula, by dipping the substrate into the mass, by spraying or rolling the latter.

Beim Trocknen der Masse erfolgt ein inniges Verbinden derselben, bedingt hauptsächlich durch die Gegenwart von Magnesit und. Schiefer. Der in der Masse enthaltene Schiefer macht den Überzug außerdem aufnahmefähig für den. Griffel, während ihm der Schmirgel den nötigen Härtegrad verleiht. Die schwarze Farbe (zweckmäßig Rebschwarz) läßt die Griffelschrift in weißer Farbe deutlich hervortreten, während das Harzöl, das ursprünglich zur Verflüssigung des trockenen Pulvers gedient hat, nunmehr das Abbinden derselben begünstigt.When the mass dries, it is intimately bonded, conditionally mainly due to the presence of magnesite and. Slate. The one contained in the mass Slate also makes the coating receptive to the. Stylus while him the emery gives the necessary degree of hardness. The black color (useful vine black) allows the stylus writing to stand out clearly in white color, while the resin oil, which originally served to liquefy the dry powder, now that Tying the same favors.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung unzerbrechlicher, abwaschbarer, schwarzer Schreibtafeln für Griffelschrift durch Überziehen einer Unterlage aus Karton, Pappe, Holz, Blech o. dgl. mit.einer Deckschicht, welche Schiefer- und Schmirgelpulver sowie schwarzen Farbstoff enthält, dadurch gekennzeichnet, daß die Deckschicht unter gleichzeitigem Zusatz von feinstkörnigem Magnesitpulver mit Harzöl angerieben wird. PATENT CLAIM: Process for the production of unbreakable, washable, black writing boards for stylus writing by covering a base made of cardboard, cardboard, wood, sheet metal or the like with a top layer which contains slate and emery powder as well as black dye, characterized in that the top layer is rubbed with resin oil with the simultaneous addition of fine-grain magnesite powder.
DET36228D 1929-01-08 1929-01-08 Process for the production of unbreakable, washable, black writing boards for stylus writing Expired DE499897C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DET36228D DE499897C (en) 1929-01-08 1929-01-08 Process for the production of unbreakable, washable, black writing boards for stylus writing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DET36228D DE499897C (en) 1929-01-08 1929-01-08 Process for the production of unbreakable, washable, black writing boards for stylus writing

Publications (1)

Publication Number Publication Date
DE499897C true DE499897C (en) 1930-06-14

Family

ID=7559639

Family Applications (1)

Application Number Title Priority Date Filing Date
DET36228D Expired DE499897C (en) 1929-01-08 1929-01-08 Process for the production of unbreakable, washable, black writing boards for stylus writing

Country Status (1)

Country Link
DE (1) DE499897C (en)

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