process for the manufacture of cheese and a hollow object of fibrous materials with a binder, and a hollow object produced with application

摘要

704,089. Moulding pipes &c. from asbestoscement. NAAMLOOZE VENNOOTSCHAP ETERNIT VORHEEN EBRSTE MEDERLANDSCHE FABRIEK VAN ASBEST-CEMENTPLATEN MARTINIT. March 19, 1951 [May 25. 1950], No. 6540 /51, Class 87 (2) Hollow bodies of angular or curved shape, e.g. T-pieces and pipe bends, are moulded from a mixture containing a watery substance in which asbestos and cement predominate by feeding the mixture, after being homogenized, under pressure into moulding space between a mould and a core and having the required non- rectilinear or angular character, the walls of the mould and/ or core being perforated and coated or covered with filtering material. The Figure shows apparatus in which the walls of the mould 19 are perforated at 22 and are lined with filtering material 21. The pasty material is stirred in a tank 4 and then passed into another tank 7. Air can be supplied under pressure to the tank 7 from a pipe 11, with a regulating valve 12 and a non-return valve 13, and air can be removed through a valve 10. A stirrer 9 is actuated, the valve 10 being open for the removal of excess air. The valve. 10 is closed and a delivery valve 15 opened and air under pressure of about 6 atmospheres, as measured by a manometer 8, is admitted to the tank 7. The material is therefore forced into the space between the mould and the core being directed between inner and outer cores 16, 17. The pressure is maintained for. a short time, so de-watering the paste, and the valve 15 is then closed. By releasing bolts 18 the mould, may then be removed and the material left to set in it. The mould may include characters to impress the moulded products with trade-marks.