DE3613584A1 - TURBOMIC EXTRUSION - Google Patents

Description

"PaiSritäiiMIte

Ratingen, April 18, 1986
G 1618 mjl2

Applicant:

company

GUMIX, S.A.

08013 Barcelona / Spain

Turbo mixing extrusion press

Extrusion is one of the most popular shaping processes, Among other things, for the production of rubber or plastic products as well as other, more natural ones or artificial resins in the form of profiles or tubes.

The machine extrusion manufacturing process with helical spindle webs is based on the plasticization of the through the filling opening of the extrusion chamber filled material, which is converted into a viscous substance and in the direction of the outlet

Oststraße 45 · D-4030 Ratingen 1 · Telephone (0) 2102/29001 -Telex 172102323 Teietex 2102323 - patbrev · Facsimile (III) (0) 2102/21854

head is promoted, at the same time an increasing pressure and a temperature increase in the promoted Mass is evoked to eventually produce this mass through the die attached to the outlet head.

The zones of the extrusion chamber of a screw extruder are normally divided as follows:

a) filling zone,

b) plasticizing zone,

c) compression zone and

d) pumping or dosing zone.

By extrusion with helical Spindle webs no significant improvement in the homogenization of the pressed materials is achieved, although a large number of attempts have been made to ascertain a certain degree of mixing of the substances or products of the mixture components and, accordingly, a more uniform property of quality of the squeezed out product. Research efforts and attempts for a more homogeneous mixing of the extruded mixture was directed mainly towards the screw extruders, but without to achieve concrete results that would have made a significant improvement in the compressed mixture possible. In some cases, research has resulted in no significant results on the extrusion chambers or cylinder sleeves concentrated, the results obtained thereby reducing the cost of the screw extruder considerably increased.

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Among the various embodiments of the screw and mixing zones stand out most of the tendency, the ridges and the depth of the transport channels between the plastification zone b) and compression zone c).

The traditional design of the special screw with mixing zones

is made by deepening the channels with storage slopes and axial outlets changed. These can have a uniform, narrow guidance of the notch in their design. With IQ of this shaping is a certain exchange of the through the individual different channels achieved flowing mass and consequently a certain mixing effect through the exchange and the additional laminar flow caused.

- ^ g The subject of the present invention is a turbo-mixing extrusion press, on their spindle and chamber those known as blades on other rotary machines Parts are attached, which in particular with turbines mainly used to transport liquid media. These parts can have turbulent or messy flows and bring about a real mixing in the conveyed mass, whereby an improved homogenization is achieved.

Essentially is the extruder of the invention by a flow rate control zone in the central screw zone marked, which is provided with blades similar to the turbines, which act as a distributor

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of the material flow and divide, deflect and cross the viscous material to be processed. Finally, after a full exchange of the moving particles, you get a top quality product with an optimal degree of homogenization.

For a correct application of the guide vanes in the extrusion press, the operating behavior of this machine Thoroughly tested and below are some of the most important parameters to consider.

Screw or screw extrusions are normally used, but not necessarily for extruding materials with relatively high viscosities used. In reality, the screw pump can only generate pressure because of the liquid being pumped has a finite viscosity. The procedural principle is fundamentally different from that of centrifugal, piston or gear pumps. Hence, some of the first manufacturers did the screw pumps are referred to as "screw rotor viscosity pumps".

After examining the various operating parameters of the screw or string pumps, taking into account of the technical properties of the shovel, it seems advantageous to combine the properties of both components in order to obtain a mixing extruder, whose Advantages compared to conventional strand machines are as follows:

a) high mixing and homogenizing performance of the to be processed Mass due to the function of one or more guide wheels with fixed blades on the extrusion cylinder.

b) Better end product quality with uniform parameters due to the high mixing homogeneity.

c) High throughput by increasing the flow rate in relation to the frictional flux due to the shear force of the blades; no sliding or none in the zone Friction of the mass against the strand cylinder, which improves the feed movement.

d) Relative temperature reduction of the pressed mass due to the reduction in friction corresponding to the im

reasons given in the previous point. This is very important when processing rubber compounds, as the working temperature should usually not exceed 100 ° Celsius.
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e) Higher energy efficiency of the machine with higher production with the same performance due to the friction reduction of the friction flow and the lower Influence of the negative pressure flow factor along the screw or the extruder spindle, since the Shovels through the at the nozzle of the discharge head reduce the backflow generated by the pressure present.

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The invention is illustrated below with reference to the drawing the invention is not intended to limit in any way, explained in more detail. Show:

Fig. 1: a longitudinal section of an extrusion chamber

section according to a first embodiment the invention,

Fig. 2, 3:

a front view and a longitudinal section each

on a somewhat larger scale of a stator according to FIG. 1,

4: a longitudinal section of an extrusion chamber section according to a further embodiment

the invention,

Fig. 5, 6:

a front view and a longitudinal section on an enlarged scale of a stator according to FIG

Fig. 4,

7: a longitudinal section of an extrusion chamber section according to a third embodiment the invention,

Fig. 8, 9:

a front view and a longitudinal section each

2Q on a slightly enlarged scale of a guide wheel

according to Fig. 7,

Fig. 10: a development of the inner surface of a solid Cylinder part of the extrusion chamber according to an embodiment of the invention,

11: a longitudinal section of a chamber section

according to a fourth embodiment of the invention,

FIG. 12: a cross section of that shown in FIG

Extrusion chamber,
10

FIG. 13: a longitudinal section, on an enlarged scale, of a guide wheel according to that shown in FIG. 11 Embodiment.

As the figures clearly show, the inventive Turbomix extruder a single rotating Spindle 1 with spiral webs that in one fixed extrusion chamber cylinder 2 with several guide wheels

3 runs.
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Each stator 3 consists of a plurality of blades

4 with a hydrodynamic profile and with one of the viscosity the mass to be processed to be adjusted angle of attack, the webs 6 of the spindle 1 shovel the form of action assume 3 in the zone of the idler wheels mentioned.

In the embodiment according to Figures 1 to 3 are the blades 4 at the ends of the guide wheels 3 are arranged one behind the other (next to one another) and at a distance from one another. 0

In the embodiment according to Figures 4 to 6 are The idler wheels 3 mentioned are narrower and separated from one another by spacer sleeves 5. The idlers 3 have in this Embodiment the same width as the blades 4 on. The idlers 3 can when assembling the invention Press can be pushed into the extrusion chamber via the spindle 1 until it reaches its final position reach.

In the exemplary embodiments according to FIGS. 7 to 9 the idlers 3 are slightly wider than in the embodiments according to Figures 4 to 6. You are also through Spacer sleeves 5 separated from one another.

It is particularly important in this context that the webs have cut-out sections 7, which are a Allow passing the guide wheels 3 or the blades 4. This is together with the spacer bars A radial and axial effect is achieved when the material to be pressed is circulated.

In these embodiments, the (built-in) introduced into the extrusion chamber via the rotary spindle 1 Idlers 3 combined with the extrusion cylinder 2 and can against other guide wheels 3 with guide vanes 4 with others hydrodynamic profiles and / or angles of attack are exchanged in accordance with the illustrations in FIG will.

a fourth embodiment is shown in FIGS described in which the idlers 3 divided and by means of

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Fastening screws 8 attached to the extrusion cylinder 2 are. Here, too, it is easy to install and remove the guide wheels 3 in the extrusion chamber possible.

The mechanical installation of the guide wheels 3 in the extrusion chamber can be done in very different ways. As a rule, the installation / removal will be carried out in such a way that on The easiest way to disassemble and assemble the spindle and machine is made possible with the same resistance to be able to work as economically as possible.

The reshaping of the spiral webs in the central zone the spindle in blades poses no particular difficulty because they are parts that are in their Shape and mechanical manufacture are very similar.

Claims (9)

10 patent claims: 1. Turbomixing extrusion press with a single rotating spindle (1) with spiral webs (6) in one Cylinder (2), characterized in that the cylinder (2) of the extrusion chamber firmly seated and with different guide wheels (3), consisting of a large number of blades (4) with a hydrodynamic profile and an angle of attack adapted to the viscosity of the mass to be processed Is provided. 2. Extruder according to claim 1, characterized in that the spiral-shaped Web (6) of the spindle (1) the shape of action shovels in the zone where the idlers (3) are located 15th Oststraße 45 · D-4030 Ratingen 1 ■ Telephone (0) 2102/29001 · Telex 172102323 · Teletex 2102323 - patbrev ■ Facsimile (III) (0) 2102/21854 3. Extruder according to claim 1 or 2, characterized in that the with hydrodynamic Profllschaufein (4) equipped guide wheels (3) through Spacer sleeves (5) are separated. 4. Extruder according to one of claims 1 to 3, characterized in that at least some of the webs (6) of the spindle (1) as Axial blades are designed to act and the guide wheels can be installed in the extrusion chamber. 5. Extruder according to one of claims 1 to 4, characterized in that the Web (6) of the spindle (1) apart from with spacer bars also with acting as radial and axial blades cut-out webs (7) are equipped. 6. Extruder according to one of claims 1 to 5, characterized in that the on the fixed extrusion cylinder attached guide wheels (3) by others, with hydrodynamically different Blade profile and / or angle of attack are interchangeable. 7, extrusion press according to one of claims 1 to 6, characterized in that the guide wheels consisting of a plurality of blades (4) (3) are divided and can be attached to the extrusion cylinder by means of connecting screws (8). 8. extruder according to one of claims 1 to 7,
characterized in that the blades (4) are arranged side by side at a distance from one another. 9. Extrusion press according to one of claims 1 to 8,
characterized in that the blades (4) are arranged one behind the other / next to one another at the ends of the guide wheels (3).