| 摘要 |
<p>1,156,759. Low - temperature extruders. NESTLE'S PRODUCTS Ltd. 25 March, 1968 [27 Feb., 1968], No. 45225/68. Divided out of 1,156,758. Heading B5A. An apparatus suitable for compressing ground frozen vegetable, e.g. coffee, extracts to provide a homogenous solid comprises a compression chamber, which may be refrigerated to below -20‹ C. for example by placing the entire apparatus within a refrigeration chamber, a feed for supplying the frozen material to the compression chamber under pressure, a rotatable screw within the compression chamber, and an extrusion nozzle at the end of the compression chamber, there being provided means, such as an electric heating element within the shaft, for heating the screw. In the figure, the material is fed from hopper 1 by screw 3 into compression chamber 5 containing screw 6, and is extruded in the form of a hollow tube via synthetic resin nozzle 7 of low slip resistance. Heating elements 8, 9, and 10 serve to melt the surface of the solid to further reduce the friction, and the extruded material may pass into a freezing tunnel. The whole apparatus is placed in a refrigeration chamber maintained at below -40‹ C.</p> |
