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AssigneeKrupp Kautex Machinenbau GmbH
InventorsWerner Daubenbu/ chel, Dieter Hess, Erich Kiefer
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During the production of a preform of thermoplastic synthetic material by means of extrusion from an extruder head provided with a slot-shaped exit opening, the width of which is changed according to a specific program during the extrusion of the preform in order to change the wall thickness thereof, the wall thickness of at least one section of the preform should be controlled by at least one additional program, which is superposed on at least one portion of the first program, which is longer than the additional program. In this manner, one achieves greater flexibility in respect to fulfilling the requirements of each situation on the programming, namely both in respect to the resolution and in respect to precise determination of the location of the individual switch points, even when a very great number of changes of the slot width must be undertaken over a very short section of the preform or during a very short time period during the extrusion process.
Procedure for manufacturing a preform of thermoplastic synthetic material by means of extrusion from an extruding head provided with a slot-shaped exit opening, the width of which is changed during the extrusion of the preform in order to adjust the wall thickness of the same according to a predetermined program, characterized thereby that the wall thickness of at least one partial area of the preform is controlled by means of at least one additional program, which is superposed upon the first program, which is longer than the additional program.
Device for manufacturing of a preform of thermoplastic synthetic material by means of extrusion from an extruder head provided with a slot-shaped exit opening, the width of which is adjustable during the extrusion of the preform in order to adjust the wall thickness thereof by means of a device provided with a specific program for the distribution of the wall thickness of the preform, characterized thereby that at least one second device (54) provided with a program for influencing the wall thickness of the preform (42) has been included in the design and that this program is shorter in respect to its duration in time or the extent of its influence on the preform (42) than the program of the first programmed device (53) and is in effect only in at least one partial area of the program of the first device (62).
Dependencies are inferred from the claim text.