| 摘要 |
<p>A nozzle for extruding a hose-shaped product of plastics matter includes a head (14), which is rotatable about a stationary column (11), and cooperates therewith along three concentric cylindrical surfaces (16, 17, 18) with gradually decreasing diameters. Two rolling bearings (12, 13) are provided at one (16) of the cylindrical surfaces. Plastics matter is supplied by way of three connections (26, 28) at the base of the column and is, by axial passages (22, 23, 29) transferred to different levels within the column, and is then, by radial continuation passages (30, 31, 32) led to separate cylindrical interfaces (16, 17, 18), from which the matter by way of radial passages (36, 37, 38) and axial passages (39, 40, 41) in the head are fed to a common extrusion slot (15). One of the flows of plastic matter (from connection 26) is brought to pass the rolling bearings (12, 13), which hereby are effectively lubricated and cause an extra working of the plastics matter. Adjustable gland packings (43, 44) are located outside the flow passages at the cylindrical interfaces.</p> |
