DE9210376U1 - Device for recycling product mixtures of polypropylene (PP) and polystyrene (PS) - Google Patents

Description

Contact: Franz Dennelieier _f Peter-und-Paul-Str. 1, 8890 Aichach

Device for recycling product mixtures from
Polypropylene (PP) and polystyrene (PS)

Description

The invention relates to a device for recycling product mixtures of polypropylene (PP) and polystyrene (PS)

Devices of this type are already known from the German utility model G 90 17 858.0.
However, the system described there, which is certainly functional, is intended to be suitable for use in recycling a wide variety of plastics, such as polyethylene, polypropylene, polystyrene, polyvinyl chloride and Styrofoam. Due to the extremely different properties of these individual plastics, such a device can only represent a compromise in operation for each specific plastic.

Due to the expected quantities of plastics to be recycled from households and businesses and due to the high demands on the quality of the recyclate, such a device must be optimally designed for each specific plastic. This applies in particular to the entire cup fraction from plastic waste, which consists essentially of PP and PS.

The object of the invention was therefore to create a device for recycling product mixtures of PP and PS, which offers optimal working, throughput and quality conditions with regard to use with such product mixtures of PP and PS.

The solution to this problem is achieved by a device for the
Recycling of product mixtures of PP and PS consisting of the combination of the following elements arranged in the order listed:

- a mill (1) for crushing the product mixtures into
Schnitzel,

- a dosing system (2) for dosing the chips,

- a stirring vessel (3) for dispersing the
Schnitzel in water,

- a separation tank (4) with agitator for washing and
for the separation of foreign components and for
Sink-float separation of PP and PS,

- a discharge device for the PS chips from the
Separation container (4),

- a friction separator (5) for separating
Water and impurities from the PS chips,

- a screening machine (6) for cleaning the water from the
Friction separator (5),

- a mechanical dryer (8) for drying the
PS chips and for separating the waste water,

- an intermediate silo (10) for buffering and homogenization
the PS schnitzel,

- a discharge device for the PP chips from the
Separation container (4),

- a mechanical dryer (7) for drying the PP chips and separating the waste water,

- an intermediate silo (9) for buffering and homogenization
the PP schnitzel,

- a lock (13) for selectively loading a
subsequent extruder (11) either with PS chips or with PP chips,

- the extruder (11) with degassing device, protective screening and regranulation,

- a granulate silo (12) either for PS regranulate or for PP regranulate,

- several elements linking the individual elements,
Conveying facilities

- a water treatment plant for the treatment and
Re-feeding of all used water into the
circulation, and

- a computer control and regulation for the entire
Contraption.

The arrangement of a device according to the invention is shown schematically as an example in the drawing.

The products fed into mill 1 come from a sorting system in which products that are not made of PP or PS are manually sorted out. Other foreign bodies and coarse impurities are also removed in the sorting system. Ferrous metals are separated using magnetic separators. This pre-sorted material is shredded in mill 1 into chips with a size of around 1 cm ² .

The chips are transferred via a dosing system 2 into a mixing tank 3, where they are dispersed in water and from there pumped into a separation tank 4. In the separation tank 4, the chips are washed and separated from one another based on their different densities. The PS chips are transferred from the separation tank 4 to a friction separator 5 via a screw and pump and are separated from the dirty water and impurities there. The water from the friction separator 5 is cleaned in a screening machine 6.

The pre-dried PS chips are further dried in a mechanical dryer 8 and then brought to an intermediate silo 10 where they are homogenized and buffered.
The PP chips from the separation container 4 are fed via a screw directly into a mechanical dryer 7 and dried there. From there, the PP chips go into an intermediate silo 9, where they are buffered and homogenized.
The intermediate silos 9 and 10 can optionally feed an extruder 11 via a lock 13, in which the chips are then melted. The extruder 11 includes a degassing device in which water vapor and other volatile components are removed, a melt screening device in which solid components larger than 150 μηη are screened out, and a regranulating device, e.g. a hot die or a strand granulating device. From the extruder

11 the regranulate is transferred to a granulate silo 12.

All the water used in the device is permanently cleaned in a water treatment plant and returned to the cycle.

The entire device is computer controlled, regulated and monitored.

The lock 13 can be dispensed with if the intermediate silo 9 directly connects an extruder 11 with a granulate silo

12 and the intermediate silo 10 directly feed another extruder with an intermediate silo.

1 mill

2 Dosing system

3 Stirring containers

4 separating containers with stirrer

5 Functional separation

6 Screening machine

7 Drying PP

8 tons PS

9 Intermediate silo PP

10 intermediate silo PS

11 Extruders

12 Granulate silo PP or PS

13 Lock

Claims (1)

Registrant: Franz Demelneier, Peter-und-Paul-Str. 1, 8890 Aichach Device for recycling product mixtures of polypropylene (PP) and polystyrene (PS) Protection claims . Device for recycling product mixtures of PP and PS consisting of the combination of the following elements arranged in the order listed: a mill (1) for crushing the product mixtures into chips, a dosing system (2) for dosing the chips, a stirring tank (3) for dispersing the chips in water, a separation tank (4) with agitator for washing and separating foreign matter as well as for sink-float separation of PP and PS, a discharge device for the PS chips from the separation container (4) , a friction separator (5) for separating water and impurities from the PS chips, a screening machine (6) for cleaning the water from the friction separator (5), a mechanical dryer (8) for drying the PS chips and separating the waste water, an intermediate silo (10) for buffering and homogenizing the PS chips, a discharge device for the PP chips from the separation container (4), a mechanical dryer (7) for drying the PP chips and separating the waste water, an intermediate silo (9) for buffering and homogenizing the PP chips, a lock (13) for optionally feeding a subsequent extruder (11) either with PS chips or with PP chips, the extruder (11) with degassing device, melt screening and regranulation, a granulate silo (12) either for PS regranulate or for PP regranulate, several conveyor systems linking the individual elements a water treatment plant to treat and recycle all the water used into the circuit1, and a computer control and regulation for the entire device.