Plastic article or earthenware shaping or treating: apparatus – Means feeding fluent stock from plural sources to common... – Extrusion shaping means
Reexamination Certificate
1998-12-23
2001-04-10
Pyon, Harold (Department: 1722)
Plastic article or earthenware shaping or treating: apparatus
Means feeding fluent stock from plural sources to common...
Extrusion shaping means
C029S426100, C029S428000, C425S188000, C425S19200R, C425S462000
Reexamination Certificate
active
06213748
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a multiple extrusion head for the production of profiles, in particular for tire production.
Multiple extrusion heads are, as a rule, of divided design, in order to ensure easy access to the flow duct inserts. Easy access is necessary because the flow ducts must be cleaned when changing the mixture, which usually occurs frequently. Access is also necessary so that flow duct inserts of a different shape can be inserted in the event of a change of the profile dimensions. An extrusion head of this type is disclosed, for example, in DE 32 38 284 C2. Extrusion heads capable of being swung open have a fundamental disadvantage in that high internal pressure acts on both head parts and must be absorbed by means of a complicated interlocking mechanism. It is difficult to reliably control the high pressure which occurs in swing-open extrusion heads.
DE 37 29 447 A1 discloses an extrusion head where the extrusion head has a fixedly arranged head flange into which extruders open. A closed head is arranged on the head flange so as to be capable of being braced against the head flange and of being pivoted away from the head flange. The closed head has open flow ducts. An adapter and a profile strip are arranged in the head so as to be exchangeable at the rear of the head. However, this head does not allow one to vary the shape of the flow ducts, i.e., the guidance of the material, by exchange. Therefore, the range of use of this extrusion head is greatly limited.
SUMMARY OF THE INVENTION
An object of one embodiment of this invention is to provide a multiple extrusion head which does not require any interlocking of two head halves and yet allows easy cleaning and rapid conversion of the flow ducts in the head for different runs.
According to one embodiment of this invention a multiple extrusion head for the production of profiles comprises a fixedly arranged head flange, extruders open to said head flange, a closed head arranged so as to be capable of being braced against said head flange, wherein said closed head has a receptacle which is open in the direction of said head flange and in which at least one open flow duct insert having flow ducts is removably arranged, and an adapter and a profile strip in said closed head and arranged downstream of said flow ducts.
According to an embodiment of this invention, the receptacle tapers in a wedgelike manner in the direction of the adapter.
According to an embodiment of this invention, the closed head is arranged so as to be capable of being pivoted away from the head flange.
According to an embodiment of this invention, the closed head is capable of being pivoted away from the head flange about a vertical axis of rotation.
According to an embodiment of this invention, the multiple extrusion head may comprise a clamping device capable of bracing the closed head against the head flange.
According to another embodiment of this invention a multiple extrusion head for the production of profiles comprises a fixedly arranged head flange, extruders open to the head flange, a closed head, wherein the closed head is arranged so as to be capable of being braced against the head flange, and wherein the closed head has a receptacle which is open in the direction of the head flange and in which at least one open flow duct insert having flow ducts is removably arranged.
According to yet another embodiment of the invention, a method of inserting at least one open flow duct insert in a multiple extrusion head for the production of profiles comprises removably arranging the at least one open flow duct insert having flow ducts in a receptacle of a closed head, fixedly arranging a head flange so that the closed head is braced against the head flange, and wherein the receptacle is open in the direction of the head flange, and flanging extruders to the head flange so that the extruders are open to the head flange.
According to yet another embodiment of the invention, a method of removing at least one open flow duct insert from a multiple extrusion head for the production of profiles comprises removing a braced head flange from a closed head, where the closed head has a receptacle which is open in the direction of the head flange, and where the receptacle has the at least one open flow duct insert removably arranged therein, and removing the at least one open flow duct removably arranged in the receptacle.
An exemplary embodiment is illustrated in the drawings and is described in more detail below.
REFERENCES:
patent: 4137027 (1979-01-01), Ruger
patent: 4526528 (1985-07-01), Kline et al.
patent: 4983113 (1991-01-01), Hirschkorn
patent: 5061166 (1991-10-01), Gohlisch et al.
patent: 3238284 C2 (1986-08-01), None
patent: 3729447 A1 (1989-03-01), None
Foley & Lardner
Hermann Berstorff Maschinenbau GmbH
Leyson Joseph
Pyon Harold
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