Plastic article or earthenware shaping or treating: apparatus – With apparatus assembly or dismantling means or with idle part – Plural wear or shaping surfaces mounted for alternative use
Patent
1997-09-11
1999-06-01
Nguyen, Khanh P
Plastic article or earthenware shaping or treating: apparatus
With apparatus assembly or dismantling means or with idle part
Plural wear or shaping surfaces mounted for alternative use
425186, 425192R, 425466, 425467, B29C 4720, B29C 4722
Patent
active
059086424
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an extrusion head for plastics extruders with a die head, which is disposed axially in the extrusion direction downstream from a jaw plate and formed by an outer cone and an inner cone.
If after a product is extruded, the plastics extruder is to be used for the extrusion of a different product, particularly one having different dimensions, it is necessary to change either the entire extrusion head, which is extremely heavy and difficult to handle, or at least the die head of the extrusion head. In both cases, a considerable effort is involved and the extruder generally has to be stopped for several hours. In order to avoid that the plastic material, which is in the extruder and was used for the preceding production, solidifies and clogs the units of the extruder in contact with the plastic material and even makes them inoperable, the extruder, before the actual exchanging process, must be operated with a special plastics composition, which is not flammable, does not degrade and cannot solidify and, in addition, has advantageous heating and thermal conductivity properties.
SUMMARY OF THE INVENTION
It is an object of the invention to provide an extrusion head, which can be installed quickly and with little effort for extruding a different product.
The inventive extrusion head makes it possible to retool for extruding a different product in an exceptionally short time, so that it is not necessary to use a special plastic material in preparation for the exchanging work. The retooling or installing process is exceptionally simple and dispenses with the necessity to handle heavy parts. Since the orifice part has only a relatively low mass, it can be brought to the operating temperature quickly and with little expenditure of energy. The work of preparing the orifice part removed for later re-use is also relatively slight.
Numerous further details and advantages arise out of the following description and the drawing, in which an example of the object of the invention is shown in greater detail in the accompanying drawings.
FIG. 1 shows an axial section illustrating the jaw plate and the die head of the inventive extrusion head,
FIG. 2 shows half of a front view corresponding to FIG. 1,
FIGS. 3 and 4 show representations, similar to that of FIG. 1, of a modified version, and
FIG. 5 shows a side view of accessory equipment for exchanging.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
According to FIG. 1, the inventive extrusion head, which is shown only diagrammatically in FIG. 5 and labeled 1 as a whole, comprises a die head 2 which, in the extrusion direction 4, is disposed axially after a jaw plate 3 and, in detail, is formed by an outer cone 5 and an inner cone 6. The outer cone 5 and the inner cone 6 together form the outside and the inside respectively of a manifold 7, through which the plastic resin composition, which is to be extruded is pressed, before it emerges from the manifold 7 in the form of a cylindrical pipe at 8, for example.
The die head 2 is divided in the radial direction into a main part 9 and an orifice part 10. In the example shown, the main part 9, in turn, is divided in the radial direction into a basic part 11, adjacent to the jaw plate 3, and an intermediate part 12, which is placed between the basic part 11 and the orifice part 10.
The outer cone 5a of the orifice part 10 is fixed separately at the outer cone 5b of the intermediate part 12, by means of a bayonet-like quick release fitting 13 in the example shown. The quick release fitting 13 comprises a sealing and clamping ring 15, which can be secured in position at the outer cone 5b of the intermediate part 12 by connecting screws 14 and, at the outer cone 5a of the orifice part 10, forms a clamping gap 17, which is bounded at the front by the sealing projections 16 and can be changed by the connecting screws 14 and is intended to accommodate the locking projections 18, which are coordinated with the sealing projections 16. The clamping gap 17 has a diameter, which slightly exceed
REFERENCES:
patent: 3321805 (1967-05-01), Given
patent: 3570062 (1971-03-01), Dukert
patent: 3676535 (1972-07-01), Juel
patent: 3833247 (1974-09-01), Puskas
patent: 5124096 (1992-06-01), Brambilla
patent: 5125698 (1992-06-01), Altimus
patent: 5221541 (1993-06-01), Arbour et al.
patent: 5388977 (1995-02-01), Shirakawa
patent: 5518036 (1996-05-01), DeMasters et al.
Mulder Dirk
Veen Hendrik Willem
Machinefabriek "de Rollepaal" B.V.
Nguyen Khanh P
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