Method for the operation of a production plant to produce an extrudate
A technology of production equipment and operation method, applied in the field of operation of production equipment for manufacturing extrudates, can solve problems such as undesired placement of measuring devices
Active Publication Date: 2009-11-18
SIKORA GMBH
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Problems solved by technology
However, the disadvantage is that, for various reasons, it is not desirable to arrange the measuring device at exactly that point between the extruder and the crosslinking or cooling path
This has the disadvantage of only achieving very slow regulation
Method used
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Embodiment Construction
[0037] exist figure 1 An extruder 10 is shown in , by means of which a plastic sheathing is performed on a wire 12 to produce a cable 14 . By means of a pulling device 16, the wire 12 (core wire) is drawn out from a feed drum not shown. The cable 14 is conveyed through a cooling path 18 , cooled, and wound on a drum 20 . To this end, the drum 20 is driven by a motor. The pulling device 16 determines the production speed or line speed, but the production speed or line speed is variable. As a result, the core wire 12 is assigned a measuring head 26 which measures the wire speed. A further measuring head 28 is arranged between the drawing device 16 and the extruder 10 , which measures the diameter of the wire 12 or core wire. The diameter is denoted as d core . The extruder 10 is assigned a measuring head 30 which measures the rotational speed n of the extruder 10 ex . After the cooling path 18 there is a measuring head 32 which measures the wall thickness W of the sheath...
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Method for the operation of a production plant to produce an extrudate, by extruding, in at least one extruder whose screw rotation rate is variable, at least one layer of the extrudate composed of plastic, where the velocity of the extrudate (linear velocity) is variable, and moreover by measuring the diameter and / or the wall thickness of the layer by using a measuring head at a distance from the extruder, characterized by the following steps: - in an extruder model in a computer, an algorithm is stored to calculate diameter values and / or wall thickness values of the layer, taking into account the rotation-rate-dependent output performance of the extruder, the internal diameter of the layer and the linear velocity, - the extruder model is generated from the volume output (extruder performance) via measurement of the wall thickness and / or of the diameter, the extruder rotation rate, the linear velocity and the internal diameter and / or the core diameter, - during production of the extrudate, the extruder model calculates, for an internal diameter, a linear velocity, a screw rotation rate of the extruder and rotation-rate-dependent data for the output performance of the extruder, the value predictable as generated by the extruder for diameter and / or wall thickness, - the calculated, predictable value for diameter and / or wall thickness is indicated and - the calculated and indicated value for diameter and / or wall thickness is brought to the specified value for diameter and / or wall thickness via change in the screw rotation rate of the extruder and / or the linear velocity.
Description
technical field [0001] The invention relates to a method according to claim 1 . Background technique [0002] Cables are usually produced by drawing their conductors (core wires) through an extruder, which applies at least one insulating layer of a suitable plastic material to the conductors. After extrusion, the cable or extrudate (strang) is guided through a cooling path or a vulcanization or drying crosslinking path. For example for reasons of dielectric strength, the covering must have a minimum wall thickness. On the other hand, wall thicknesses that are unnecessarily large are avoided for reasons of material savings or weight. Therefore, it is necessary to continuously monitor the wall thickness or diameter of the cable or extrudate and provide a means of calibrating when it exceeds or falls below a preset value. [0003] In plants for cable production, it is known to arrange a measuring device for the outer diameter at a short distance after the extruder in the pro...
Claims
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IPC IPC(8): B29C47/92H01B13/14H01B13/24B29C48/06B29C48/09B29C48/10B29C48/92
CPCH01B13/24B29C2947/92647B29C2947/92952B29C2947/926B29C47/92B29C2947/92123B29L2031/3462B29C2947/92152B29C47/0016B29C47/0854B29C47/0026B29C2947/9259B29C2947/92885B29C47/0023B29C2947/9298B29C2947/92619B29C2947/92933B29C2947/92438B29C48/92B29C48/06B29C48/09B29C48/10B29C48/251B29C2948/92123B29C2948/92152B29C2948/92438B29C2948/9259B29C2948/926B29C2948/92619B29C2948/92647B29C2948/92885B29C2948/92933B29C2948/92952B29C2948/9298
Inventor H·斯考拉S·兰珀
Owner SIKORA GMBH