METHOD AND APPARATUS FOR THE MANUFACTURE OF HEAT-RESISTANT, TRANSPARENT, STRATIFIED ELEMENTS

摘要

Method and plant for the manufacture of heat-resistant, transparent, stratified elements which envisage: preparing two or more sheets (V) of transparent material which are arranged facing each other and spaced by retaining means (2) able to seal them peripherally; mixing, using stirring means (5) inside a container (3), an aqueous solution of alkali polysilicate with colloidal silica dispersed in water, with consequent formation of an intumescent liquid mixture (M); irradiating the mixture M by means of electromagnetic radiation having a frequency of less than 30 GHz; degassing the same mixture (M) with extraction of a part of water in the vapour phase using suction means (12); filling the receiving chamber (C) with the mixture (M) by means of circulation means (6) and then hardening it inside the intumescent chamber (C). Advantageously mixing is performed by means of ultrasound. Heating means (4) may be provided for controlling the temperature of the mixture (M) inside the container (3). The abovementioned mixture (M) is distinguished preferably by a SiO2/Me2O ratio of between 3 and 5.