US 4,249,879 AGranted

Granulating apparatus

AssigneeHermann Berstorff Maschinenbau GmbH

InventorsDietmar Anders, Jurgen Voigt

Life of this patent

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Abstract

Granulating apparatus having a cutting plate and a multi-blade cutting tool drivable by drive means and cooperating with the cutting plate, wherein, to ensure that the operating conditions, particularly fluctuating temperatures of the various components causing differential expansion, do not affect the setting of the cutter blades with respect to the cutting plate, the cutting plate, the bearing housing, the fixed bearing, the cutting blade shaft, the blade holder and the cutting blades are mechanically interconnected with one another with such interconnection disposed approximately in the cutting plane defined between the cutting plate and the cutting blades, whereby axial force-locking and form-locking connection of the components starting from the cutting plate and extending by way of the bearing means to the cutting blades, extends approximately in the cutting plane.

Claims11

Dependent claims

Apparatus for granulating plastics melt and other materials comprising a granulating head;

a cutting plate mounted on said granulating head;
a cutting tool having a plurality of blades spaced a predetermined distance from and cooperating with said cutting plate and defining therewith a cutting plane;
a shaft to which said blade holder is mounted for rotation, and drive means for rotating said shaft;
a housing enclosing said granulating head, and means in said housing for cooling and conveying cut granules;
a guide sleeve to which said cutting plate is secured;
a bearing housing around said shaft and within said guide sleeve, and a fixed bearing around and supporting said shaft;
a centering ring disposed approximately in said cutting plane and supporting said bearing housing, the arrangement being such that said cutting plate, said blade holder and said cutting blades, and said retaining ring are approximately in said cutting plane, whereby expansion of the material of said components due to the heat of the melt is compensated for so that the predetermined distance between said blades and said cutting plate can be continuously maintained.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 06/048,175Filed 12 Jun 1979
Priority: DE 282563912 Jun 1978
Granted: 10 Feb 1981
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

B02C 18/086
Within vertical containers: specially adapted for disintegrating plastics, e.g. cinematographic films
B29B 9/065
In the form of filamentary material, e.g. combined with extrusion: under-water, e.g. underwater pelletizers
B29C 48/0022
Combinations of extrusion moulding with other shaping operations: combined with cutting
B29C 48/05
Characterised by the shape of the extruded material at extrusion: filamentary, e.g. strands