| 摘要 |
1,195,820. Moulding frozen particles. LEYBOLD-HERAEUS VERWALTUNG G.m.b.H. 25 April, 1969 [25 April, 1968], No. 21362/69. Heading B5A. [Also in Division F4] Fine powder particles, formed during the grinding of freeze dried products, are granulated by the extrusion thereof, by a pressure roller 11, through orifices 13 into the interior of a roller 12 provided with a scraper 14, the process being conducted within a chamber 5 connected to a vacuum pump 19, via a condenser 20 which sublimes vapour arising from heat generated by the granulation, the vacuum in the chamber 5 being such as to maintain the fines at a temperature at which they begin to thaw, whereby they agglomerate during the extrusion thereof. The surface temperature of the condenser 20 may be used to control the pressure within the chamber 5. The fines are supplied to the nip of the rollers 11, 12 from a hopper 7 feed to distributer 8, the hopper 7 being supplied from a hopper 1, provided with a stirrer 3 and evacuated by a vacuum pump 4, through a vacuum-tight valve 6. The granules are discharged from chamber 5, through a vacuumtight valve 16, into a discharge lock 17 evacuated by a vacuum pump 18. |
