US 7,320,585 B2 | ||
Device for the hot granulation of thermoplastic polymers | ||
Alessandro Casalini, Mantova (Italy) | ||
Assigned to Polimeri Europa S.p.A., Brindisi (Italy) | ||
Appl. No. 10/498,015 PCT Filed Dec. 05, 2002, PCT No. PCT/EP02/13785 § 371(c)(1), (2), (4) Date Jan. 05, 2005, PCT Pub. No. WO03/053650, PCT Pub. Date Jul. 03, 2003. |
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Claims priority of application No. MI2001A2708 (IT), filed on Dec. 20, 2001. | ||
Prior Publication US 2005/0123638 A1, Jun. 09, 2005 | ||
Int. Cl. B29B 9/10 (2006.01) |
U.S. Cl. 425—464 [425/67; 425/311; 425/378.1] | 14 Claims |
1. A device for the hot granulation of thermoplastic polymers, optionally expandable, which consists essentially of:
a) a die, consisting of a cylindrical body having a thermostat-regulator for maintaining the die at a temperature close to
or higher than the softening point of the polymer, containing on the outer surface a plurality of small plates, equipped with
a plurality of extrusion holes, and a plurality of feeding ducts of the molten polymer, situated inside the cylindrical body
in correspondence with and connected to the perforated small plates, lined with a material having a high thermal conductivity;
b) a cutting chamber comprising a set of spraying nozzles which create a jet of drops of a themostat-regulating liquid used
for cooling and removing of the cut granules, nebulized and sprayed against the die;
c) a cutting system comprising a cutting plate, firmly constrained to a rotating shaft, supporting a set of knives arranged
so that the cutting profile of the knife is radial with respect to the surface of the die which faces said cutting system.
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