Device for producing extruded bodies of a plastic material

Details Device for producing extruded bodies of a plastic material Device for producing extruded bodies of a plastic material

1997-08-07

1998-12-15

Ryan, Patrick

Plastic article or earthenware shaping or treating: apparatus

Traversing roll pressurizing means operably associated with...

264169, 2641761, 425204, 425365, 425382R, 425DIG230, B29C 4710

Patent

active

058493409

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The present invention relates to a device for the manufacture of extruded bodies from a plastic material or a damp pulp, comprising at the outlet end of a container for the material or the pulp an output device with a number of output wings driven by a rotatably driven shaft and at an axial distance from the output device a rotatably driven extrusion device with a number of extrusion wings, of which the outer ends during the rotation of the press device sweep closely up inside a surrounding annular, perforated wall in order to press out the outputted material through perforations in the wall to the space surrounding the wall.


BACKGROUND OF THE INVENTION

An extrusion device of this type is known for example from EP-A-0 163 619 and has been developed in order to avoid the disadvantages which are associated with the more usual type of extrusion devices, which works according to the same principle as a meat grinder where the material with the help of one or more screws is fed to and pressed out from a chopper disc. This way of working and the necessary high pressure entail several disadvantages which amongst others result in an unhomogenous product as well as deformation of the chopper disc after just a short period of use since the pressure acts on the total surface of the chopper disc.
A device of the type mentioned in the introduction works according to a low pressure principle. The spatula-like rotating extrusion wings press the material through the perforations in the annular wall which can be conical or cylindrical. The pressure forces on the perforated wall are localised along the lines where the wines contact the wall, which means that the forces on the perforated wall are only a fraction of those on the firstmentioned chopper disc.
An essential characteristic of the extruder known from EP-A-0 163 619 is that the output device and the press device rotate in opposite directions and for this purpose each device has its own drive motor.


OBJECT OF THE INVENTION

The object of the present invention is generally to produce an extrusion device which works according to the low pressure principle and has lower manufacturing and operating costs than corresponding prior art extrusion devices as well as its principle of construction resulting in a large number of variables for optimising of the capacity and the quality of the extrusion.


SUMMARY OF THE INVENTION

This is achieved according to the invention by a stationary guide rail arrangement being placed between the output device and the press device, and by the output device and press device being driven in the same direction of rotation.
Through having the output and press device rotating in the same direction it is possible to design their geometries so that they can also rotate with the same speed and in this way be fixed on a common shaft. One of the advantages with this compared with the prior art design is that just one drive motor suffices.


BRIEF DESCRIPTION OF THE DRAWINGS

The invention is described more closely with reference to the appended drawings showing an embodiment, where FIG. 1 shows a longitudinal cross-section through an embodiment of a device according to the invention, FIG. 2 is a view from above of the device in FIG. 1, FIG. 3 a sectioned extension of a part of the device in FIG. 1, FIG. 4 a plan view of the output device in FIG. 1 and FIG. 5 a plan view of the extrusion device in the device shown in FIG. 1.


DETAILED DESCRIPTION OF THE INVENTION

In FIG. 1 the lower part of a cylindrical container for the material which is to be extruded has the reference sign 1. By the bottom edge of the container 1 an extruder with the reference sign 2 is fixed which comprises a casing comprising an internally conical upper part 3, a cylindrical intermediate part 4, a cylinder 5 with a perforated cylindrical wall 6 and a circular bottom disc 7 with a flat internal bottom surface 8. which are fixedly joined with each other and delimit a space into which material from the container can be fed down.
A shaft 10 driven by a

REFERENCES:
patent: 2160302 (1939-05-01), Billows
patent: 3166026 (1965-01-01), Crane
patent: 3511190 (1970-05-01), Kunz
patent: 4770625 (1988-09-01), Appelgren et al.
patent: 5009586 (1991-04-01), Pallmann
patent: 5242292 (1993-09-01), Wenger

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