DE418419C - Process for molding ceramic objects with low flame shrinkage - Google Patents

Description

GERMAN EMPIRE

ISSUED ON
SEPTEMBER 5, 1925.

REICH PATENT OFFICE

PATENT LETTERING

- JVl 418419 - CLASS 80b GROUP

(H96901 VI \ 8ob)

Hermsdorf-Schomburg isolators G. m. B. H., based in Berlin, Administration Hermsdorf in Hermsdorf, Thür. *).

It is well known that fireclay objects are manufactured in such a way that a part is already Burnt stihamot in a suitable way brought into a granular shape and with a Part of plastic materials, e.g. clay or raw kaolin, is mixed. That way it gets a malleable, plastic mass, which can be turned into the desired shape by turning, pressing, etc. Can bring forms. In order to minimize shrinkage in the fire achieve, it is desirable to add not yet fired plastic material to press down as much as possible in the mass. In the process, however, it loses more and more of its own Plasticity, so that the difficulties that arise with the shape

*) The patent seeker stated as the inventor:

O. Ballentin in Margarethenhütte, Post Großdiibrau i. Sat

Very soon a limit was set for a further reduction in plastic additives is.

In the manufacturing method according to the present invention · can with the addition not yet fired plastic materials can be reduced significantly further than the old methods. It consists in that with the already fired grainy Material first a form that is completely filled. The plastic additives are prepared for themselves in the manner of a pouring slip, and this is subsequently poured into the mold, making the cavities that the pre-fired material between has left its individual grains, fills out. After a while the casts will become hard enough and can be removed from the mold.

It can be readily seen that a body produced in this way at subsequent firing can practically no longer show any shrinkage, as the grains of the pre-burnt and therefore already completely disappeared material Filling the mold with each other come into direct contact. So you are through none Layers, which can show a shrinkage in the fire, separated from each other, so that in contrast, the whole body must maintain its dimensions when burning to the known manufacturing method mentioned at the beginning.

As an example, the shape of a chamotte capsule is shown in the drawing. The room b is here filled with granular, burnt chamotte (so-called pearl barley). The slurry-like filler material under pressure is fed through the openings c , while the air located in the cavities between the grains can escape from the openings rf.

Claims (1)

Patent claim: Process for the production of ceramic objects, some of which are made from already fired and therefore that has disappeared and, on the other hand, is made of not yet fired and therefore still shrinkable material exist, characterized in that the already fired, brought into a suitable granular form material first is brought into the form, with the grains touching each other directly, and then the not yet fired, for making the binding necessary material in the form of a slip, the cavities between the grains filling in, is introduced.