method and device for the production of grossformatigen poroesen formkoerpern low density by blaehen.

摘要

For making large-sized porous heavy clayware elements of low density, a clay-mineral mass of substances which are naturally able to swell or made able to swell, such as basalts, perlites, shales and clays is induced to swell evenly by means of thermal, chemical and mechanical treatment. Thin compact clay bodies in sheet form, which have been dried and possibly preheated, are supported by rollers geometrically unyieldingly at the sides and below, geometrically yieldingly above, varying in a form-fitting manner according to the proceeding of the swelling, but gas-permeably on all sides, and are supported on all sides at the rear by the unswollen clay mass, held by means of friction, and at the front by the already swollen clay mass, held by means of friction, are heated and swollen by heat being applied from above and below between and over the rollers and by oxidising gases being applied to the surfaces of the clay bodies in sheet form for as long as it takes for an element in sheet form of the desired low density to be formed. In this way a high rate and uniformity of heating are achieved in the swelling operation without the swelling clay mass sintering on the apparatus, a high dimensional stability of the clay mass is achieved during swelling with a low expenditure of force for shaping and transporting the swelling clay mass and consequently large-sized elements of uniformly low density as well as uniform and high porosity, strength and dimensional accuracy are achieved, as well as cost-effective production of them. …IMAGE…