Pressure variable, multiscrew, continuous mixing machine for pla

Agitating – Rubber or heavy plastic working – Stirrer is through-pass screw conveyor

Patent

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Details

Other Related Categories

366 88, 366 90, B29B 748

Type

Patent

Status

active

Patent number

061061425

Description

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION

The invention relates to a multiscrew, continuous mixing machine for plasticizable compounds with two screws, which rotate in the same direction in a housing and which penetrate the cylindrical part of the housing that envelopes the screw concerned and exhibit feed and metering sections and inbetween at least one homogenizing section and a mixing section, whereby the feed and metering sections are formed by intermeshing conveying screws and are arranged in the mixing elements, which are opposite the homogenizing and mixing sections, followed by restricting elements, which consist of short screw elements with back feed thread.
Such a machine is described in the DE-PS 43 38 795 (=U.S. Pat. No. 5,499,870). In the case of this machine, the restricting elements following the mixing elements ensure that a chamber which extends above the mixing elements is constantly filled, whereby it is supposed that the machine is constantly fed an appropriate quantity of the material to be mixed. In the case of the known machine, the restricting elements consist of short screw elements with interrupted back feed thread. The interruptions in the area of the vertex of the back feed thread produce overflow channels as it were, which owing to their size, enable the plasticized material to flow.
Owing to the interruptions in the back feed thread, a constant flow opening is provided, which is independent of the speed at which the machine is operated, which results in an identical pressure always being present in the chamber extending above the mixing elements, which is essentially independent of the speed.
The invention is based on being able to provide a selectable variable pressure in the chamber. By means of the invention, this takes place in that the back feed thread forms a vertex, which progresses radially shortened along a thread in such a way that the radius of the vertex is shorter on the inlet side than on the outlet side and inbetween increases continuously towards the outlet side.
This arrangement of the vertex of the back feed thread results in the surprising effect that the pressure in the chamber increases with increasing speed. The machine operator is therefore able to optionally adjust the pressure in the chamber by varying the speed of the two screws of the machine, which can be used to exert a particular influence on the material to be plasticized. This results in the quantity of energy supplied to the material to be plasticized increasing with increasing pressure in the chamber, which depending on the viscosity of the material concerned, is expressed in an appropriate temperature in the chamber. In addition, there is also the effect that the additives added to the material to be plasticized, more or less intensively intermix with the material.
Based on this simple measure of optional adjustment of the machine speed, a broad spectrum of various materials can be processed with this machine without having to alter the configuration of the machine elements, particularly the restricting elements, which would make it necessary to disassemble and reassemble the machine. For adjustment to processing different materials, according to the invention, it is only necessary to vary the speed, which is easily possible by appropriate control of the usual electric drive motor. According to the invention, the machine is suitable for virtually universal application.
The effect of the increasing pressure in the chamber with increasing speed can be explained in that in contrast to the aforementioned interruptions in the feed back thread of the restricting elements, which according to the invention continuously produces a special dispersing effect in the radius of the thread vertex increasing in the direction of passage through the machine, which apparently becomes more pronounced the higher the machine speed, so that at extremely high speeds, virtual sealing of chamber results due to the restricting elements, which intermesh at the end of their threads on the outlet side of the chamber and th

REFERENCES:
patent: 3608868 (1971-09-01), Koch
patent: 3983862 (1976-10-01), Spriet
patent: 4541270 (1985-09-01), Hanslik
patent: 4600311 (1986-07-01), Mourrier et al.
patent: 5267788 (1993-12-01), Rockstedt
patent: 5318358 (1994-06-01), Wobbe et al.
patent: 5499870 (1996-03-01), Rockstedt

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