An underwater cutting pelletizer is disclosed wherein a water chamber is circular in plan, an inlet portion is formed on one side in a diametrical direction of the water chamber to introduce cooling water into the water chamber, and an outlet portion is formed on the other side in the diametrical direction of the water chamber to discharge the cooling water from the interior of the water chamber to the exterior, the inlet portion being in a divergent shape in an inflow direction of cooling water...

A cutter hub and blade assembly supported and driven for rotational and axial movement in relation to the die face of a die plate in an underwater pelletizer including a positive control of such axial movement to obtain and maintain optimal axial position of the cutter hub and blades during the pelletizing operation and to minimize wear of the mechanical components involved. Positive control of the axial movement of the cutter hub and blades is obtained by a hydraulic/pneumatic actuation system ...

A cutter hub and blade assembly for an underwater pelletizer in which molten polymer is extruded as strands through orifices in a die plate. The cutter hub is rotatably driven and includes cutter blades mounted at a steep angle on the cutter hub and move along the face of the die plate to cut the extruded strands into pellets. The cutter blade support angle on the cutter arms is 60.degree.-79.degree., preferably about 72.degree. to about 76.degree. and most preferably about 75.degree.. The blade...

The invention relates to a granulator for producing granulate from molten plastic with a cutter head displaceable over an adjustment range, said cutter head cooperating with a die plate dispensing the plastic strands, said cutter head being connected to a drive shaft of a drive motor containing a stator and a drive rotor and being axially displaceable with respect to the die plate. The drive rotor is axially displaceable over the adjustment range by means of a linear adjustment element and is fi...

An apparatus for spinning artificial filaments relates to continuous spinning frames. It comprises a reservoir with spinning solution containin a spinneret and a portion of one cylinder of a pair where complete recovery of the filament takes place. A partition dividing the reservoir into a complete recovery zone and a filament spinning zone is located in the reservoir between the spinneret and that portion of cylinder which is dipped into the spinning solution, said partition filtering the spinn...

A method and apparatus for producing particulated gelatinous substances, such as gelatinous polymers, and solutions of these materials in which the gel is formed, in a reaction chamber equipped with a hydraulically actuated piston and perforate extrusion head and the gelatinous product is subsequently extruded into a stream of solvent or nonsolvent fluid flowing at relatively high velocity on the exterior of the perforate head. The gelatinous substance is displaced from the reaction chamber by i...

A sizer assembly for providing a shaped polymeric article in an extrusion process comprises a sizer body having a product profile channel corresponding to the shaped polymeric article formed therethrough. The sizer body comprises a plurality of cooling liquid inlet slots forming an opening substantially around the product profile channel and a plurality of vacuum slots forming an opening substantially around the product profile channel for removing cooling liquid expelled from said cooling liqui...

Two rows of nozzles 4a and 4b whose open ends are formed as orifices 2 of a die are respectively made to communicate with introducing slots 3 of orifice units 6, and jackets 7 for temperature regulation are each disposed between the orifice units 6. First nozzle portions 41a and 41b of a small diameter are provided in the nozzles 4a and 4b for the purpose of reducing a dead space where the orifices 2 cannot be disposed due to the jackets 7, and the jackets 7 are disposed at their depthwise posit...

A center heated die plate for an underwater pelletizer radiates heat outwardly to the extrusion orifices and die faces of the die plate thereby maintaining the die plate and extrusion orifices at an elevated temperature to obtain optimum flow of molten polymer through the extrusion orifices. In one embodiment, a centrally located heating plate is mounted in a recess on the upstream face of the die plate inwardly of the nose cone. In a second embodiment, a cylindrical heating coil is placed in a ...

A device for granulating plastic melts comprises a granulating head (2) to which a perforated plate (3) provided with melt-discharge openings (10) is attached, which openings are swept by rotating knives (4). The perforated plate (3) is enclosed by a granulating housing (1) which is provided with at least one housing inlet (7) through which a cooling and transport medium (C), preferably water or air, can be supplied to the interior of the granulating housing (1), the cooling and transport medium...