Plastic article or earthenware shaping or treating: apparatus – With apparatus assembly or dismantling means or with idle part – Including support or guide means for disassembled element
Patent
1996-12-23
1998-06-09
Woo, Jay H.
Plastic article or earthenware shaping or treating: apparatus
With apparatus assembly or dismantling means or with idle part
Including support or guide means for disassembled element
425190, 425192R, 425381, 425464, B29C 4716
Patent
active
057629757
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a die head fitted to the outlet of an extruder for discharging thermoplastics, having a manifold which is flowed through by the polymer melted in the extruder and delivers said polymer through a die plate on the outlet side of the die head.
BACKGROUND OF THE INVENTION
The die head has previously been fastened to the outlet of the extruder by screwing. For cleaning the die head, which is necessary both when it is soiled and when changing over to a different polymer material, the die head must then be unscrewed and, if applicable, replaced by an awaiting die head, which then for its part has to be screwed onto the outlet of the extruder. If the die head involved is particularly large and heavy, it has also already been the practice to use a hinge to fit it to the outlet of the extruder, from which the die head can be swung away for the purpose of cleaning the said arrangement. In this case, however, the rapid exchange of a soiled die head by an awaiting die head is not possible.
SUMMARY OF THE INVENTION
The invention is based on the object of designing the die head such that it can be removed in a simple way from the outlet of the extruder and, if applicable, be replaced by an awaiting die head. According to the invention, this takes place by providing that the die head is mounted longitudinally displaceably, transversely with respect to the polymer flow, in a rail guide of an intermediate plate arranged between outlet of the extruder and die head and can be removed from the intermediate plate by longitudinal displacing, the die head being supported on the intermediate plate by means of sealing surfaces, against which the die head can be pressed by a screw coupling, the loosening of which makes possible the longitudinal displaceability of the die head.
Mounting the die head in the rail guide opens up the possibility of initially making the outlet of the extruder accessible just by longitudinally displacing the die head, so that this area is exposed for cleaning. The removal of the die head from the outlet of the extruder is then performed by a longitudinal displacement into an area in which the die head can be removed, so that it can be easily cleaned away from the outlet of the extruder. An available clean die head can then be inserted into the rail guide immediately after removal of the possibly soiled die head and be brought into its normal position, in which the die head is flowed through by the melted polymer. Only a few manipulations are required for this exchanging of the die head, with the result that this operation can be carried out very quickly. Production is in this case interrupted only very briefly. There is no need here to unscrew the screw coupling, loosened in this case, entirely from the intermediate plate, since just a slackening of the screw coupling is necessary in order to displace the die head in the longitudinal direction and finally remove it from the intermediate plate.
A cavity is expediently formed in the intermediate plate for receiving the melted polymer in such a way that its cross section right up to the die head corresponds at least to the barrel bore of the extruder. In the case of this design, with the die head adequately displaced longitudinally or removed, the screw contained in the extruder can be readily drawn out of the barrel of the extruder since, because of the correspondingly large cross section of the cavity in the intermediate plate, the screw can readily be drawn out through said cavity.
To be able also to subject the die plate separately to cleaning, or to replace a die plate for another with a different arrangement of the holes, the die plate is expediently mounted in a further rail guide on the die head, with the result that the die plate can be removed from the die head by longitudinal displacing, the die plate being supported on the die head by means of sealing surfaces against which the die plate can be brought to bear by a screw coupling, the loosening of which permits the longitudinal displaceability
REFERENCES:
patent: 3543557 (1970-12-01), Lomas
patent: 3957565 (1976-05-01), Livingston et al.
patent: 4464104 (1984-08-01), Gneuss
patent: 4889476 (1989-12-01), Buehning
patent: 5078586 (1992-01-01), Holzschuh
patent: 5221541 (1993-06-01), Arbour et al.
patent: 5223276 (1993-06-01), Djordjevic et al.
patent: 5269670 (1993-12-01), Allen et al.
patent: 5388977 (1995-02-01), Shirakawa
patent: 5580581 (1996-12-01), Buehning
Compex GmbH Compoundier-und Extrusionsanlagen
Schwartz Iurie A.
Woo Jay H.
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