GB410383A - Improvements in and relating to the manufacture of fibre pulp articles - Google Patents

Abstract

410,383. Moulding pulp. BAUMGARTNER, DR. KATZ & CO., GES., Eiswerder, Spandau, Germany. Sept. 11, 1933, No. 25089. Convention date, Sept. 10, 1932. [Class 87 (ii).] In the manufacture of articles from fibre pulp in moulds with pervious walls, the mould is filled from above with a predetermined amount of pulp at a filling station which is firmly, temporarily and stationarily connected with the mould, the excess water being withdrawn from the pulp by causing an atmospheric pressure difference between the inside of the mould and the outside, after which the mould is similarly connected to a drying station where a heated gaseous medium is passed through the article in the mould. Either the moulds or the filling and drying stations may be the moving parts of the apparatus. By increasing the number of filling-stations, articles may be produced with a number of layers, e.g., an outer layer of cellulose and the inner layer of wood pulp, or, an outer layer of wood pulp and the inner layer of a plastic or colloidal mass. A number of moulds may be filled and dried simultaneously. The article may be impregnated, dyed or may have its surface changed by mechanical pressing before leaving the mould. As shown, the mould a consists of three parts a\ a<2>, a<3> each consisting of a support with a fine mesh thereon, as shown in dotted lines, which parts can be opened after drying and closed before re-filling with pulp. The mould is carried on a wing c on a sleeve g revoluble on the shaft e. In Fig. 2, the mould is shown at the filling station, the mould being clamped between the hopper h and a vacuum connection i by a lever k operated by a pressure cylinder l. The mould is filled with pulp through the hopper h by a tilting measuring vessel n, and in certain cases it may be desirable to introduce water into the mould before, after, or at the time of supplying the pulp, either by a second tilting vessel, or from below through a water connection o. The cock m is then opened and the water sucked out of the mould. The mould is then similarly clamped between a heating-medium connection q and a draining connection r. A number of drying stations may be provided to which the mould is secured in succession, so that drying agents under pressure and /or vacuum may be used, e.g. steam before final drying with hot air. The movements of the moulds, or of the stations, when the moulds are stationary, may be effected by hand or automatically, and a motion other than a rotary motion may be employed.