PROCEDIMENTO ED IMPIANTO PER LA FORMATURA A SECCO DI STOVIGLIE IN GENE RE, PARTICOLARMENTE PER PIATTI

摘要

In a method for dry-forming crockery by means of isostatic moulds, comprising compacting the powder within an isostatic mould, the powder is subjected to close-together pressure pulses during exertion of the compacting pressure. The press is comprising an isostatic mould (6), a punch (5) and a base (6) with a membrane (67). Means are provided for feeding a hydraulic liquid onto the rear of the membrane (67) for isostatically pressing the powder in the mould. The pressurized hydraulic liquid feed means comprise a source of hydraulic liquid connected to the rear of the membrane (67) via a distributor valve (15) arranged to move and to connect the rear of the membrane (67) alternately to the source of liquid and to the discharge. The distributor valve (15) oscillates between these two positions and generates pressure pulses to the rear of the membrane.