DE10126689A1 - Extrusion equipment for production of plastic window profiles comprises several extruders each feeding a different area of a single die - Google Patents

Abstract

Three or more extruders (1,2,3) supply separate extrudates (5a,5b,5c) of the same material along flow lines to an extrusion die. The die is divided into three or more areas (4a,4b,4c) each fed by one of the extrudates. An Independent claim is also included for a process for extruding profiles, in particular window profiles, in which three extrudates controlled independently from each other are fed separately to each area of the die where they are combined as a single extrudate and calibrated (6).

Description

The invention relates to a device for extruding profiles, in particular window profiles, comprising:
at least three extruders for extruding plastic material,
an extrusion nozzle for producing a plastic profile, which is connected to the extruders via an extruder strand, and
a calibration device for calibrating the plastic profile generated.

The invention further relates to a method for extruding pro filen, in particular of window profiles, comprising the steps: Extru dieren of plastic material in at least three extruders, feeding the extruded plastic mass from the extruders to an extrusi onsdüse, the connection from each extruder to the extrusion nozzle via one extruder strand each and each extruder strand one Part of the extrusion die is assigned, extruding the profile in the extrusion die, calibrating the profile in a calibration device, until it has achieved sufficient inherent stability.

Devices and methods for extruding plastic profiles are known from the prior art. DE 196 47 968 teaches for example a method for extruding a hollow chamber profile. Two sub-profiles are manufactured, calibrated and using separate extruders merged into a single profile in a further operation leads.

In all known methods, the retraction of the extrusion die is that Most complex and therefore very time-consuming and expensive. The extrusion tool is installed in an extrusion system and over the extru who loaded with material. The profile then created is opened  checked its quality and in particular dimensional accuracy. experi Corrections to the extrusion nozzle are then required sary. An exact prediction or calculation with the help of Simulation programs, such as this from injection molding technology (MOLD FLOW or CADMOLD) are known on extrusion technology not transferable.

An iterative process is carried out by changing the nozzle cross cut affects the flow behavior of the melt until the ge desired profile is reached. This optimization process takes one Large number of hours, because after each change of the nozzle a new one Production cycle must be driven. Usually is an entire Extrusion line blocked for this optimization over several days.

The invention is therefore based on the task, the Ferti reduce the time required for an extrusion die, while optimizing tion process should be simplified.

The object is in connection with the preamble of claim 1 solved in that the extrusion nozzle in at least three sub-areas is divided, each sub-area of one of the Extruder is supplied with plastic material, being in all extruders the same plastic material is processed.

This division of the profile into a finite number of extruder strands gene allows the mass flows of the profile in more complicated Be affecting rich. It is envisaged that each sub-area via at least one separate extruder line with one of the extruders connected is. It becomes possible by changing the speed and with it the output of the extruder the amount of plastic affect melt. The change in the amount of plastic melt can also with or only by changing the ver driving parameters of the extruder. For example  by changing the temperature in the extruder the flow behavior of the Melt affects and consequently also the amount expelled.

The extruder strands are advantageously provided with tempering means ren provided. So not only about the extruder speed, but the mass flow also varies via the temperature in the extruder strand become. If necessary, each extruder strand can go further be branched out, it makes sense to do this via a Y distributor.

In the method according to the invention in connection with the upper Concept of claim 5, the amount of plastic melt in the individual extruder strands are controlled independently or regulated.

The control or regulation of the quantity supply is advantageous of plastic melt in the extruder strands by influencing the Speed of the respective extruder or by influencing the temperature reached in the respective extruder strand.

Depending on the geometric design of the profile, the number of parts areas, i.e. extruder strands, to choose differently. With the proposed device or the proposed method an inexpensive solution is provided, the optimization phase to shorten the extrusion tool and thus manufacturing time and consequently also to reduce manufacturing costs.

The proposed device or the proposed method is particularly suitable for use with so-called "short runs". here are to be understood as profiles, of which a production quantity of up to 5000 m per year are required. For comparison: with a Pro production volume of more than 100,000 m per year "Skiers".

In the drawings, an embodiment of the invention is schematic shown table:

Fig. 1 shows a schematic diagram of an extrusion system and in

Fig. 2 shows the extrusion die.

From Fig. 1 a basic arrangement of an extrusion system is provided. Via a reservoir 7 , several extruders, here three designated 1 , 2 and 3 , are supplied via supply lines 8 with one and the same raw material, for example plastic granules. The Extru the 1 , 2 , 3 are connected to the extrusion tool 4 via extruder strands 5 . The extrusion tool is divided into several sections, in this example in three sections 4 a, 4 b, 4 c, each of which is connected to another extruder 1 , 2 or 3 . The calibration device 6 connects to the extrusion tool 4 .

The melt streams from the extruder strands 5 a, 5 b, 5 c in the Teilbe range 4 a, 4 b, 4 c of the extrusion die 4 are either on the speed of the extruder 1 , 2 , 3 or on the temperature in the extruder derstrang 5 a, 5 b, 5 c to influence. This is achieved, for example, by changing the process parameters of the extruder or, as can be seen from FIG. 1, means for tempering are arranged on the extruder strands 5 a, 5 b, 5 c. It is envisaged to provide the temperature via heating cartridges or a heating ring line. When using a ring line, it is possible not only to heat the melt flow, but also to cool it by using an appropriate coolant. With some profile geometries, it may be necessary to split an extruder strand 5 even further, for this purpose a division of the extruder strand 5 via a Y distributor is particularly suitable. Such a Y distributor is shown in FIG. 2.

This figure shows a more detailed representation of the partial areas 4 a, 4 b, 4 c, of the extrusion die 4 , how the melt streams can be divided.

All melt flows from the sub-areas, regardless of how many parts areas selected for the corresponding profile are still in within the extrusion tool to a common strand merged and as a single profile to the calibration device to hand over.  

LIST OF REFERENCE NUMBERS

1

first extruder

2

second extruder

3

third extruder

4

extrusion die

4

a,

4

b

4

c Parts of the extrusion die

4

5

extruder strand

5

a,

5

b

5

c separate extruder strands

6

calibration

7

reservoir

8th

supply line

9

Y junction

10

Means for tempering

Claims (8)

1. An apparatus for extruding profiles, in particular Fen sterprofilen, which comprises:
at least three extruders ( 1 , 2 , 3 ) for extruding plastic material,
an extrusion nozzle ( 4 ) for producing a plastic profile, which is connected to the extruders ( 1 , 2 , 3 ) via an extruder strand ( 5 a, 5 b, 5 c), and
a calibration device ( 6 ) for calibrating the plastic profile produced,
characterized in that
the extrusion nozzle ( 4 ) is divided into at least three sections ( 4 a, 4 b, 4 c), each section ( 4 a, 4 b, 4 c) being supplied with plastic material by one of the extruders ( 1 , 2 , 3 ) , whereby the same plastic material is processed in all extruders ( 1 , 2 , 3 ). 2. Device according to claim 1, characterized in that each section ( 4 a, 4 b, 4 c) via at least one separate extruder derstrang ( 5 a, 5 b; 5 c) with one of the extruders ( 1 , 2 , 3 ) connected is. 3. Device according to claim 2, characterized in that the extruder strand ( 5 ) is provided with means for tempering ( 10 ). 4. Device according to one of claims 1 to 3, characterized in that at least one of the extruder strands ( 5 a, 5 b, 5 c) is designed as a Y distributor. 5. A method for extruding profiles, in particular Fen sterprofilen, comprising the following steps:

• - Extruding plastic material in at least three extruders ( 1 , 2 , 3 ),
• - Feeding the extruded plastic mass from the extruders ( 1 , 2 , 3 ) to an extrusion nozzle ( 4 ), the connec tion of each extruder ( 1 , 2 , 3 ) to the extrusion nozzle ( 4 ) via an extruder strand ( 5 a, 5 b, 5 c) and each extruder strand ( 5 a, 5 b, 5 c) is each assigned to a partial area ( 4 a, 4 b, 4 c) of the extrusion die ( 4 ),
• - extruding the profile in the extrusion die ( 4 ),
• - Calibrate the profile in a calibration device ( 6 ) until it has achieved sufficient inherent stability,

characterized in that
the quantity of plastic melt in the individual extruder strands ( 5 a, 5 b, 5 c) is controlled or regulated independently of one another. 6. The method according to claim 5, characterized in that the control or regulation of the quantity supply of plastic melt in the extruder strands ( 5 a, 5 b, 5 c) via influencing the speed of the respective extruder ( 1 , 2 , 3 ). 7. The method according to claim 5 or 6, characterized in that the control or regulation of the quantity supply of plastic material in the extruder strands ( 5 a, 5 b, 5 c) by influencing the temperature in the respective extruder strand ( 5 a, 5 b, 5 c) takes place. 8. The method according to claim 5 to 7, characterized in that the control or regulation of the quantity of plastic melt in the extruder strands ( 5 a, 5 b, 5 c) takes place by influencing the process parameters of the respective extruders ( 1 , 2 , 3 ) ,