| 摘要 |
Method for manufacturing biodegradable mouldings in particular tableware and packages with application of the method of evoking the water vapour pressure inside the form involves that loose bran, in particular the wheat one of granulation from 0.01 up to 2.80 mm in the amount of 95-100% of weight containing 14% of water structurally bound in the form of moisture, if the need be, is mixed in the dry form with additional substances in the volume 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 form then the form is closed and the mixture is subject to the simultaneous operation of temperature and pressure of the scope 1-10 MPa. The form is heated up to temperature above 120°C then the form is closed and then depressurised forming the crack between the edges of the form not wider than 0.5 mm and then the form if the need be is closed again and the depressurisation cycles are repeated. After the last cycle the form is opened and the number of depressurisations is minimum 1 and the entire process of depressurization and closing the form takes few seconds and is completed according to the programme of the machinery digitally controlling the form movement depending on the expected parameters of the final product. |
