Agitating – Rubber or heavy plastic working – With specified feed means
Patent
1997-09-02
1999-11-23
Soohoo, Tony G.
Agitating
Rubber or heavy plastic working
With specified feed means
B29B 760
Patent
active
059888652
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention refers to an apparatus for reprocessing thermoplastic synthetic plastic material, comprising a receptacle for the synthetic plastic material to be processed, which receptacle has a device with at least one rotating tool which conveys the synthetic plastic material through a discharge opening of the receptacle such that a component of stuffing force is exerted on the synthetic plastic material in the axial direction of this discharge opening and transmitted thereto always by the synthetic plastic material subsequently being pressed in, which discharge opening leads to an inlet opening for the synthetic plastic material arranged in the side wall of the screw housing, whereby the interior surface of the housing of the screw in the area of the inlet opening has a pocket-like enlargement which provides an additional space to accomodate synthetic plastic material and which is bound by an adjustable wall piece on that edge of the inlet opening on which the direction of rotation of the screw is directed towards the receptacle, which wall piece allows the enlargement to be at least partially closed off from the receptacle.
A device of this kind is the subject matter of an older, not previously published construction by the present applicants. This construction has the advantage that even synthetic plastic materials possessing different properties can be reliably engaged by the screw since the stuffing action of the rotating tool continuously ensures that sufficient synthetic plastic material is pressed from the side between the individual flights of the screw rotating around its longitudinal axis. Although this in itself poses the risk that the conveying efficiency of the screw becomes too great and causes overloading of the screw drive, this risk can be avoided by drawing back the adjustable wall piece in relation to the screw such that part of the synthetic plastic material engaged by the screw is returned to the receptacle. In this way it is possible to adjust the conveying efficiency of the screw to the prevailing conditions.
SUMMARY OF THE INVENTION
The object of this invention is to further improve such an apparatus, particularly with regard to the feeding of loose materials into the screw housing and with regard to manufacturing costs. The aforementioned older construction, namely, has other wall pieces in the area of the inlet opening of the screw housing aside from the one mentioned above, some of which can be adjustable if required, and experience has shown that the area of the screw housing with the inlet opening is expensive to manufacture since its manufacture requires metal removal. The invention now improves the aforementioned apparatus with regard to the feeding of loose materials into the screw housing and with regard to the manufacturing costs by having the enlargement give way to several grooves at least in the area of the screw housing adjoining it in the transport direction of the screw, which grooves are of a depth which decreases to the screw diameter in this area and which grooves are separated from each other in this area by rigid ribs projecting toward the screw relative to the wall of the screw housing enlargement, each of these grooves providing a space for the synthetic plastic material, the longitudinal direction of which space having a substantial component extending in the axial direction of the screw housing.
The ribs confining the individual grooves create forces of resistance in the area of the inlet opening of the screw housing for the synthetic plastic material engaged by the screw, which forces prevent the said synthetic plastic material from merely rotating along with the screw without being transported further to any substantial degree in the axial direction of the screw. Owing to the fact that the ribs of the older construction mentioned initially now no longer all have to be placed in the area of the inlet opening for the synthetic plastic material, the machining of the screw housing section with the inlet opening is simplified.
REFERENCES:
patent: 3228065 (1966-01-01), Cournoyer et al.
patent: 4058298 (1977-11-01), Duska et al.
patent: 4195934 (1980-04-01), Spanier
patent: 4494877 (1985-01-01), Upmeier et al.
patent: 5096302 (1992-03-01), Durina
patent: 5683632 (1997-11-01), Shimizu et al.
Bacher Helmut
Schulz Helmuth
Wendelin Georg
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