Heat treating fine ceramic

• Main Author: ULF VOGTLANDER, EBERHARD BEYER, ULRICH KUNZE, MICHAEL KOHLER, WOLFGANG SCHMISCH, KLAUS HEMPEL, ANDREAS ACKERMANN, MANFRED WILKE, KURT SCHNEIDER, WOLFGANG GERNLEIN ET URICH KNYE
• Format: Patent
• Language: English; French
• Published: 12.04.1985
• Edition: 4
• Subjects: ARTIFICIAL STONE; BLASTING; CEMENTS; CERAMICS; CHEMISTRY; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; CONCRETE; DRYING; DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM; HEATING; LIGHTING; LIME, MAGNESIA; MECHANICAL ENGINEERING; METALLURGY; PERFORMING OPERATIONS; REFRACTORIES; SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS, SLAG, OR MIXTURESCONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER; SLAG; TRANSPORTING; TREATMENT OF NATURAL STONE; WEAPONS; WORKING CEMENT, CLAY, OR STONE

Process for heat treatment of fine ceramic articles such as cups is claimed in which the articles are carried on a moving belt permeable to air continuously from a pre-dryer and are heated rapidly at 80-90 deg.C by a drying fluid at 160-200 deg.C by means of nozzles and aspiration openings, arranged successively above and below the belt in a drying zone (I) then, by injection of a volume regulatable controlled temp. flow of outside air by means of a series of nozzles, the temp. is lowered in a zone (II) by 50-80 K. The articles are thus dried to a residual moisture content of 1%. Articles are passed into a post-drier when they are exposed in zone III to a flow of fresh air controlled by volume, drawn from zone (II) and hot air from zone (IV). On passing through zone (IV), chemically bound water is removed using an air current moving between jets and outlets with a heating rate of 25 K/min. and temps. of 58-620 deg.C. Finally in zone V of the post dryer the articles are cooled using an exterior air to an ambient temp. 40-50 deg.C supplied by jets. A.PROCEDE ET DISPOSITIF POUR LE TRAITEMENT THERMIQUE D'ARTICLES EN CERAMIQUE FINE.B.PROCEDE CARACTERISE EN CE QUE LES ARTICLES SONT TRANSPORTES D'UN PRESECHOIR 1 ET SONT CHAUFFES RAPIDEMENT A 80-90C, PUIS GRACE A UNE ADDUCTION A DEBIT REGLABLE EN VOLUME D'AIR EXTERIEUR, LA TEMPERATURE DE SECHAGE EST ABAISSEE DANS UNE ZONE II DE 50 A 80K, PUIS DANS UN POSTSECHOIR 2 LORS DU PARCOURS D'UNE ZONE IV, L'EAU CHIMIQUEMENT LIEE EST RETIREE DES ARTICLES AU MOYEN D'UN COURANT D'AIR A DES TEMPERATURES DE 580 A 620C, PUIS FINALEMENT, DANS UNE ZONE V DU POSTSECHOIR 2, LES ARTICLES SONT REFROIDIS.C.L'INVENTION CONCERNE LA FABRICATION D'ARTICLES EN CERAMIQUE FINE.