EP3458244A1 - Procédé et ensemble pour réguler et commander des installations d'extrusion de tuyaux - Google Patents

Procédé et ensemble pour réguler et commander des installations d'extrusion de tuyaux

Info

Publication number
EP3458244A1
EP3458244A1 EP17728443.7A EP17728443A EP3458244A1 EP 3458244 A1 EP3458244 A1 EP 3458244A1 EP 17728443 A EP17728443 A EP 17728443A EP 3458244 A1 EP3458244 A1 EP 3458244A1
Authority
EP
European Patent Office
Prior art keywords
extrusion
calibration device
tube
pipe
data
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP17728443.7A
Other languages
German (de)
English (en)
Inventor
Roland Böhm
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Inoex GmbH
Original Assignee
Inoex GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Inoex GmbH filed Critical Inoex GmbH
Publication of EP3458244A1 publication Critical patent/EP3458244A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
    • B29C48/907—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article using adjustable calibrators, e.g. the dimensions of the calibrator being changeable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
    • B29C48/325—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles being adjustable, i.e. having adjustable exit sections
    • B29C48/327—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles being adjustable, i.e. having adjustable exit sections with centering means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
    • B29C48/901—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies
    • B29C48/903—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies externally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/92—Measuring, controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92009—Measured parameter
    • B29C2948/92114—Dimensions
    • B29C2948/92123—Diameter or circumference
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92009—Measured parameter
    • B29C2948/92114—Dimensions
    • B29C2948/92152—Thickness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92009—Measured parameter
    • B29C2948/92114—Dimensions
    • B29C2948/92171—Distortion, shrinkage, dilatation, swell or warpage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92323—Location or phase of measurement
    • B29C2948/92447—Moulded article
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92857—Extrusion unit
    • B29C2948/92904—Die; Nozzle zone

Definitions

  • the present invention relates to a method for the regulation and control of pipe extrusion plants according to the preamble of claim 1.
  • a plastic granulate is melted by means of an extruder and pressed in an extrusion die through an annular gap which is formed by a nozzle and a mandrel arranged therein.
  • the hot melt tube produced in this way is pressed and cooled in a subsequent calibration device under negative pressure against an external calibration device, usually a calibration sleeve.
  • the calibrated and cooled tube is drawn by means of a draw-off device from the extrusion die through the calibration device and optionally through further extrusion follower devices.
  • the annular gap of the extrusion tool is greater than the diameter of the vacuum device operating with negative pressure, so that the molten tube can run in excess and seal the calibration device against the ambient pressure.
  • the inlet angle of the melt tube into the calibration device is important, which can be influenced by the distance between the extrusion tool and the calibration device. If the oversize is too small or the inlet angle is too low, it is no longer possible to seal the calibration device against the ambient pressure. If the excess is too large or the inlet angle too steep, the molten tube is stretched too fast, which can lead to stresses in the finished tube or even cracking of the melt tube before or in the calibration.
  • DDR Dimension Draw Down
  • DDR (nozzle -DKali) / D nozzle.
  • This value should be between 5% and 50% for the most important plastic pipe material HDPE (high-density polyethylene) according to the prior art.
  • the wall thickness of the extruded tube since the outer diameter is fixed by the calibrator, results from the mass flow rate of the extruder and the speed with which the tube is pulled by the extraction device.
  • the melt tube is drawn on the one hand to the diameter of the calibration device, but at the same time depending on the speed of the trigger wall thickness of the melt Hose reduced. This double stretching of the melt tube is only possible within limits and is described by the characteristic dimension ration balance (DRB):
  • This value should be between 0.97 and 1.095 for the most important plastic pipe material HDPE (high-density polyethylene) according to the prior art.
  • the hot, soft melt hose in the extrusion plant must always be in train, so as not to accumulate in the plant. At the same time the train must not be too high, because otherwise the melt tube constricts and tears off.
  • the pull acting on the molten tube is described by the ratio of the exit area of the melt from the tool to the entrance surface of the molten tube into the calibrator
  • This value should be between 130% and 700% for the most important plastic pipe material HDPE (high-density polyethylene) according to the prior art.
  • HDPE high-density polyethylene
  • the diameter, the wall thickness, any shape deviations and the sagging of the melt tube are determined at several points between the extrusion tool and the calibration device.
  • four major effects in pipe extrusion can be included in the design of the extrusion tool, which were previously not considered.
  • these measurement data can be used for optimum centering of the nozzle and mandrel of the extrusion tool as well as for setting an optimal inlet angle of the molten tube into the calibration device.
  • optical or fully electronic terahertz or gigahertz measuring technology is used to acquire the measured data. Since this type of measurement technique operates without contact and without coupling medium, a measurement can also be made on hot, contact-sensitive bodies, such as a molten tube, directly after the extrusion tool in the tube extrusion.
  • Fig. 1 shows an extrusion plant for the production of plastic pipes with their main components in a schematic representation
  • Fig. 2 is a very schematic representation of a forming between the output of the extrusion die and the inlet of the calibration sleeve melt tube.
  • the extrusion line for plastic pipe shown in Figure 1 comprises an extruder unit 1 with a feed hopper 2, via which the extruder unit 1, a thermoplastic resin in granular or powder form is fed.
  • the extruder unit 1 the granulate or the powder is warms, kneads and plasticizes. Subsequently, the plastic is conveyed as a moldable material in an extrusion die 3 and pressed there through an annular gap 1 1.
  • the thus formed, still deformable melt tube 4 'runs with oversize in a calibration device 6, which has a vacuum tank 7 with a arranged at the input, perforated Kalibrierhülse 8.
  • the calibration sleeve 8 is infinitely adjustable in diameter, so that the extruded tube 4 can be fixed to the desired outer diameter.
  • the tube 4 After leaving the calibration device 6, the tube 4 enters a cooling section 9, in which it is cooled to about room temperature.
  • a saw 10 At the end of the extrusion line a saw 10 is arranged, in which the extruded tube 4 is cut to a predetermined length.
  • the produced pipe 4 is pulled by means of a take-off unit 5 through the upstream facilities of the extrusion plant.
  • the melt tube 4 'emerging from the annular gap 1 1 formed between a nozzle 12 and a mandrel 13 of the extrusion die 3 passes into the calibration sleeve 8 of the calibrating device 6 with an oversize.
  • the calibration device 6 Immediately after exiting the extrusion die 3 and immediately before entering the calibration sleeve 8, the calibration device 6 has a plurality of gigahertz or terahertz sensors 14 distributed over the circumference of the melt tube 4 '. By means of these sensors 14, the geometric data of the molten tube 4 'are determined. Thus, the distances between the sensors 14 and the molten tube 4 'are measured, from which the diameter of the molten tube 4' and its sagging can be calculated. Furthermore, the wall thickness of the melt tube 4 'is measured at the positions of the sensors 14, and distributed from the measured differences over the circumference, determines the eccentricity of the wall thickness.
  • the inlet angle of the molten tube 4 'into the calibrating device 6 can be calculated by comparing the distance measured values of the sensors 14 after the extrusion die 3 and before the calibrating device 6.
  • the sagging of the plastic melt after the exit from the extrusion die 3 are calculated.
  • the measured data obtained or the values calculated therefrom can be used in a variety of ways to optimize the process.
  • by the measurement data with suitable algorithms via the plant control either automatically make a correction of the control variables or suggest a detailed graphical user interface (GUI) the operator detailed settings.
  • GUI graphical user interface
  • the measured data obtained can also be used to optimize the design of the extrusion tool 3, especially for calculating the optimum annular gap geometry for a wide range of applications.
  • the actual measured diameter and wall thickness of the enlarged by the strand expansion melt tube 4 ' incorporated into the interpretation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

La présente invention concerne un procédé pour assurer la régulation et la commande d'installations d'extrusion de tuyaux, en tenant compte de données de mesure d'un tuyau (4) produit, un tuyau en matière fondue (4) qui sort en excès par une fente annulaire (11) d'une unité d'extrusion (1) entrant dans un dispositif de calibrage (6) situé à la suite. L'invention vise à mettre au point un procédé de ce type, qui fonctionne avec des valeurs de mesure garantissant un fonctionnement optimal de l'installation d'extrusion, y compris en cas de changement de dimensions. A cet effet, le diamètre, l'épaisseur des parois, d'éventuels écarts de forme et le fléchissement du tuyau en matière fondue (4) sont déterminés avec précision entre l'outil d'extrusion (3) et le dispositif de calibrage (6), et les valeurs mesurées ainsi que les données calculées qui en découlent sont utilisées pour réguler et commander l'installation d'extrusion.
EP17728443.7A 2016-05-18 2017-05-17 Procédé et ensemble pour réguler et commander des installations d'extrusion de tuyaux Withdrawn EP3458244A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016109087.5A DE102016109087A1 (de) 2016-05-18 2016-05-18 Verfahren zur Regelung und Steuerung von Rohrextrusionsanlagen
PCT/DE2017/100420 WO2017198262A1 (fr) 2016-05-18 2017-05-17 Procédé et ensemble pour réguler et commander des installations d'extrusion de tuyaux

Publications (1)

Publication Number Publication Date
EP3458244A1 true EP3458244A1 (fr) 2019-03-27

Family

ID=59021206

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17728443.7A Withdrawn EP3458244A1 (fr) 2016-05-18 2017-05-17 Procédé et ensemble pour réguler et commander des installations d'extrusion de tuyaux

Country Status (3)

Country Link
EP (1) EP3458244A1 (fr)
DE (1) DE102016109087A1 (fr)
WO (1) WO2017198262A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018104705B4 (de) * 2018-03-01 2020-03-26 Sikora Ag Verfahren und Vorrichtung zum Vermessen eines rohrförmigen Strangs
DE102018122391A1 (de) * 2018-09-13 2020-03-19 Sikora Ag Vorrichtung und Verfahren zum Detektieren eines Gegenstandes
DE102018126192A1 (de) * 2018-10-22 2020-04-23 INOEX GmbH Innovationen und Ausrüstungen für die Extrusionstechnik Verfahren und Vorrichtung zum Bestimmen und Regeln des Einlaufwinkels eines Schmelzschlauchs in eine Kalibrierhülse
DE102019119491B4 (de) * 2019-07-18 2021-10-07 Sikora Ag Verfahren und Vorrichtung zum Vermessen eines rohrförmigen Strangs
CN112815841B (zh) * 2021-01-04 2022-08-09 中国航空制造技术研究院 法向测量传感器的位置标定方法及装置

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4027527A (en) * 1975-04-01 1977-06-07 Aluminum Company Of America System for determining tube eccentricity
AT401031B (de) * 1988-11-18 1996-05-28 Cincinnati Milacron Austria Einrichtung zum regeln der wandstärke
DE102006056735A1 (de) 2006-12-01 2008-06-05 Inoex Gmbh Messverfahren zur Bestimmung der Wanddicke eines extrudierten Kunststoffprofils
US7461463B1 (en) * 2007-05-16 2008-12-09 Beta Lasermike, Inc. Eccentricity gauge for wire and cable and method for measuring concentricity
GB201300016D0 (en) * 2013-01-02 2013-02-13 Proton Products Ltd Measurement of industrial products manufactured by extrusion techniques
DE102013223945A1 (de) * 2013-11-22 2015-05-28 Inoex Gmbh Messvorrichtung und Verfahren zur Vermessung von Prüfobjekten
DE102014214046B3 (de) * 2014-07-18 2015-10-01 Inoex Gmbh Messvorrichtung und Verfahren zur Vermessung von Prüfobjekten
EP2982932B1 (fr) * 2015-03-12 2017-10-18 Proton Products International Limited Mesure de produits industriels fabriqués avec des techniques d'extrusion utilisant un rayonnement terahertz

Also Published As

Publication number Publication date
WO2017198262A1 (fr) 2017-11-23
DE102016109087A1 (de) 2017-11-23

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