# US 2013/0153471 A1 · Device for separating particles of different synthetic materials

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- Number: US 2013/0153471 A1
- Document ID: US20130153471A1
- Status: Published application
- Kind: A1
- Application number: 13/812,216
- Filed: 2011-07-14
- Published: 2013-06-20
- Earliest claimed: 2010-07-29
- Inventors: Stefano Cassani
- Web page: https://patentgrep.com/patent/US20130153471A1

## CPC

- B03B 5/32: using centrifugal force
- B04B 1/20: discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
- B04B 2001/205: {with special construction of screw thread, e.g. segments, height}
- B04B 2001/2058: {with ribbon-type screw conveyor}
- B03B: SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B04B: CENTRIFUGES (high-speed drum mills B02C19/11; domestic spin driers D06F; analysing, measuring or monitoring physical or chemical properties of samples during centrifuging, see the relevant subclasses for these procedures, e.g. G01N)

## Abstract

An apparatus for separating synthetic materials having different characteristics includes a rotating drum having a cylindrical shape with a tapered end and an opposite flat bottom wall; a device configured to introduce a mixture of at least two synthetic materials in particle form and a liquid having an intermediate specific weight relative to specific weights of the two products into the drum; a radial discharge opening in the tapered end of the drum; an axial slithering discharge opening located in the bottom surface of the drum, at a distance from the drum axis, a rotor located inside the drum having a first external helical blade with the same external shape as the drum, a device configured to set the rotor in rotation relative to the drum. The blade is located at a distance from the rotor axis greater than the distance between the drum axis and the axial discharge opening.

## Claims

### Claim 1

An apparatus for separation of at least two synthetic materials in particulate form having different characteristics, the apparatus comprising:
a rotating drum (2) having a cylindrical shape with a tapered truncoconical end (21) and an opposite flat bottom wall (221);
a device (234) configured to set the drum in rotation;
a conduit (24) configured to introduce into the drum (2) a mixture composed of at least two synthetic materials in particle form, having different specific weights, and of a liquid, having an intermediate specific weight relative to the specific weights of the two products;
a radial discharge hole (5) located in the lateral wall of the tapered end of the drum;
an axial slithering discharge opening (6) located in the flat bottom surface (221) of the drum, at a distance d from the axis of the drum (2);
a rotor (3) located inside the drum (2) provided with a first external helical blade (32) having the same external shape as the drum (2) shape and having respective cylindrical (322) and tapered conical (321) portions;
a device (313) configured to set the rotor (3) in rotation relative to the drum (2), in such a way that the rotor pushes the material towards the tapered end of the drum; wherein the first external helical blade (32) extends along the entire length of the drum (2) and is located at a distance from the axis of the rotor and of the drum greater than the distance between the drum axis and the axial discharge opening provided in the non-tapered section drum bottom, wherein the rotor (3) comprises a second helical blade (320), inside the first helical blade (32) and wrapped at a distance from the drum axis in an opposite direction than that of the first helical blade (32), the second helical blade (320) extending for the entire length of a cylindrical tract (22) of the drum (2), and being supported to the first helical blade (32) at cross points with the first helical blade (32) to leave free the axial portion of the drum.

### Claim 2 (depends on 1)

The apparatus according to claim 1 wherein the rotor (3) rotates in the same direction of rotation as the drum (2).

### Claim 3 (depends on 1)

The apparatus according to claim 1 wherein the axial discharge opening (6) located on the non-tapered section bottom wall (221) of the drum (2) is at a distance from the axis of the drum which distance is greater than a minimum radius of the tapered section of the drum (2).

### Claim 4 (depends on 1)

The apparatus according to claim 1 wherein a ring (323) is located between the cylindrical portion (322) and the conical portion (321) of the first helical blade (32) to separate said portions.

### Claim 5 (depends on 4)

The apparatus according to claim 4 wherein the second helical blade (320) ends against the ring (323) separating the cylindrical portion (322) and the conical portion (321) of the first helical blade (32).

### Claim 6

(canceled)