DE29710287U1 - Planetary roller extruder - Google Patents

Description

Pianet roller extender

The invention relates to a planetary roller extruder which is arranged essentially horizontally,

- with a substantially vertically arranged filling funnel into which the plastic material to be plasticized is filled, and

- with a conveyor system that transports plastic material from the filling hopper to the material input point of the planetary roller extruder.

Planetary roller extruders are used to produce plastic melt, preferably for the extrusion of endless profiles. Several planetary spindles are arranged between a roller cylinder and a main spindle. When the main spindle is driven, the gears incorporated in the roller cylinder, planetary spindles and main spindle roll against each other so that the plastic material to be plasticized is subjected to an intensive kneading effect.

The plastic material to be processed is often a mixture consisting of several different plastics. In particular, this can be raw material to which processed recycled material has been added.

According to the state of the art, a combined conveyor-stuffing system is used to feed the planetary roller extruder. This consists of a filling hopper arranged essentially vertically, in the lower area of which a screw is arranged, which feeds the plastic material to be processed to the material input point of the planetary roller extruder in a metered manner.

The following problem can arise: If the plastic material to be processed consists of several components that

have unequal particle size and/or shape, there may be a partial separation of the different components from the time the material is filled into the hopper to the material feed point of the planetary roller extruder, which has correspondingly disadvantageous effects on plastics processing

The invention is therefore based on the object of proposing a feeding system for the plastic material to be processed for a planetary roller extruder, with which this separation cannot occur and thus a flawless production process is guaranteed.

The solution to this problem by the invention is characterized in that the conveyor system (4) consists of

- at least one first substantially horizontally arranged dosing screw conveyor system (6) and

- a second essentially vertically arranged stuffing screw conveyor system (7),

wherein the dosing screw conveyor system (6) conveys plastic material (3) to be processed into the stuffing screw conveyor system (7) and

- wherein the stuffing screw conveyor system (7) conveys the plastic material (3) to be processed at an increased speed and therefore in the partially filled state of the stuffing screw conveyor system (7) to the material feed point (5) of the planetary roller extruder (1).

With this design, the "dosing" and "plugging" steps can be carried out in isolation. Furthermore, the material drawn in from the hopper is fed to the extruder via a very short path, so that segregation is largely avoided.

According to a further development, at least two essentially horizontally arranged dosing screw conveyor systems

·

(6) feed a substantially vertically arranged stuffing screw conveyor system (7).

The drawing shows an embodiment of the device according to the invention. The figure shows a schematic of a planetary roller extruder with the plastic conveyor system.

The planetary roller extruder 1, not shown in detail, has a material input point 5, to which the plastic material to be processed is fed. The plastic 3, which can consist of several different individual components, is fed into a filling hopper 2 in a known manner.

A dosing screw is arranged under the filling funnel 2, which belongs to a dosing screw conveyor system 6. The screw or the dosing screw conveyor system is arranged essentially horizontally, i.e. parallel to the axis of the planetary roller extruder 1. The desired amount of plastic material can be removed from the funnel via the drive of the screw of the dosing screw conveyor system 6 (not shown). The screw of the dosing screw conveyor system 6 conveys the plastic material to a nearby stuffing screw conveyor system 7, which is arranged essentially vertically and connects the dosing screw conveyor system 6 and the planetary roller extruder 1. Both systems 6 and 7 together form the plastic conveyor system 4.

The screw arranged in the stuffing screw conveyor system 7 is driven by a drive (not shown), whereby the plastic material to be processed is compressed and fed to the material input point 5 of the planetary roller extruder 1.

Due to the short path from the funnel 2 to the extruder 1, a significant separation of the individual components of the plastic material 3 cannot occur, so that flawless production is ensured.

Claims (2)

Protection claims: 1. Planetary roller extruder (1) arranged substantially horizontally - with a substantially vertically arranged filling funnel (2) into which plastic material (3) to be plasticized is filled, and - with a conveyor system (4) that conveys plastic material (3) from the filling hopper (2) to the material input point (5) of the planetary roller extruder (1), characterized in that the conveyor system (4) - at least one first substantially horizontally arranged dosing screw conveyor system (6) and - a second essentially vertically arranged stuffing screw conveyor system (7), wherein the dosing screw conveyor system (6) conveys plastic material (3) to be processed into the stuffing screw conveyor system (7) and - wherein the stuffing screw conveyor system (7) conveys the plastic material (3) to be processed to the material input point (5) of the planetary roller extruder (1). 2. Planetary roller extruder according to claim 1, characterized in that at least two essentially horizontally arranged metering screw conveyor systems (6) open into an essentially vertically arranged stuffing screw conveyor system (7).