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Abstract

Method for manufacturing biodegradable moldings, in particular tableware and packages, with application of the method of evoking the water vapor pressure inside the mold consists in that loose bran, preferably the wheat bran, of granulation from 0.01 up to 2.80 mm in the amount of 95-100% of weight containing more than 14% of water structurally bound in the form of moisture, if needed, is mixed in the dry form with additional substances in the amount of up to 5% of weight in total, and the measured amount of dry material obtained in that way is placed in one of the parts of multipart mold, then the mold is closed and the mixture is subject to the simultaneous operation of temperature and pressure of the scope 1-10 MPa. The mold is heated up to temperature above 120° C., then the mold is closed, and then is depressurized, thus forming a gap between the edges of the mold not wider than 0.5 mm, and then the mold, if needed, is closed again, and the depressurization cycles are repeated. After the last cycle the mold is opened and the number of depressurizations is at least 1, and the entire process of depressurization and closing the mold takes a few seconds and is completed according to the program of the machinery digitally controlling the mold movement depending on the expected parameters of the final product.

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First Claim