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Method and device for measuring tubular strand

A strand and tubular technology, applied in the direction of measuring devices, tubular objects, testing moving fluids/granular solids, etc., can solve the problems of difficult prediction of sagging and error-prone, and achieve the effect of optimizing comparability

Pending Publication Date: 2022-03-01
SIKORA GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the prediction of sag is difficult and thus the described method is error-prone

Method used

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  • Method and device for measuring tubular strand
  • Method and device for measuring tubular strand
  • Method and device for measuring tubular strand

Examples

Experimental program
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Embodiment Construction

[0051] Unless otherwise stated, the same reference numerals denote the same objects in the various figures.

[0052] exist figure 1 An extrusion device 10 for extruding a tubular strand 16 is shown in FIG. The extrusion device 10 has, for example, in a manner known per se figure 2 A supply device 11 for supplying plastic material to be processed is shown in . The plasticized plastic material is extruded by means of an extruder screw 12 from an annular gap 14 into a tubular strand 16 . A rotationally driven central rod 18 extends inside the extruder screw 12 . In the example shown, the alignment device 22 is connected in the immediate vicinity of the extruder head 20 with a metallic alignment sleeve 24 against which the extruded strand 16 is pressed by means of low pressure. Furthermore, a first cooling section 25 with a first cooling duct 27 is shown with reference numeral 25 , in which the guided cooling of the tubular strand 16 takes place such that the strand 16 After...

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PUM

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Abstract

The invention relates to a method for measuring a tubular strand conveyed in a longitudinal direction discharged from an extrusion device, comprising the steps of: guiding terahertz radiation from at least one first radiation source from the inside onto an inner surface of the tubular strand in a first measurement region, the terahertz radiation reflected by the tubular strand is received by at least one first radiation receiver, and at least one geometric parameter of the tubular strand in the first measurement region is ascertained from the received terahertz radiation; terahertz radiation from at least one second radiation source is guided from the outside onto the outer surface of the tubular strand in a second measurement region downstream of the first measurement region in the transport direction of the strand, the terahertz radiation reflected by the tubular strand being received by at least one second radiation receiver, and ascertaining at least one geometric parameter of the tubular strand in the second measurement region from the received terahertz radiation; ascertaining a change in at least one geometric parameter of the tubular strand between the first measurement region and the second measurement region; and ascertaining at least one adjustment indication for the extrusion device on the basis of the ascertained change in the at least one geometric parameter. The invention further relates to a corresponding device.

Description

technical field [0001] The invention relates to a method and a device for measuring a tubular strand conveyed in the longitudinal direction exiting an extrusion device. Background technique [0002] In the extrusion device, the plastic supplied, for example in pellet form, is melted and the flowable plastic emerges as a tubular strand through the annular gap. Next, the tubular strands enter a calibration device with a calibration sleeve, for example by applying a low pressure (vacuum tank) to press the tubular strands against the inner surface of the calibration sleeve. In the following process, the tubular strands pass through one or more cooling sections in which the outer surface of the strands is sprayed with a cooling liquid, for example cooling water. [0003] There is a desire to ascertain certain geometrical parameters of the tubular strand, such as diameter, wall thickness or deviations from a predetermined shape, early on, so that a corrective intervention can be ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C48/92B29C48/09B29C48/49B29C48/90G01N21/3581G01N21/85G01B11/06B29L23/00
CPCB29C48/92B29C48/09B29C48/49B29C48/901G01N21/3581G01N21/85G01B11/06B29C2948/92152B29C2948/92114B29L2023/22G01N2021/8416B29C48/90B29C48/21B29C2948/9219G01N2021/8557B29C48/32G01B15/02G01B15/04
Inventor A·霍勒C·弗兰克
Owner SIKORA GMBH