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DE102011000178A1 - Method for manufacturing multilayer articles made of plastic melt, involves determining viscosity of polymer melt in injection molding tool by preforming melt with barrier layer - Google Patents

Method for manufacturing multilayer articles made of plastic melt, involves determining viscosity of polymer melt in injection molding tool by preforming melt with barrier layer Download PDF

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Publication number
DE102011000178A1
DE102011000178A1 DE201110000178 DE102011000178A DE102011000178A1 DE 102011000178 A1 DE102011000178 A1 DE 102011000178A1 DE 201110000178 DE201110000178 DE 201110000178 DE 102011000178 A DE102011000178 A DE 102011000178A DE 102011000178 A1 DE102011000178 A1 DE 102011000178A1
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Germany
Prior art keywords
melt
barrier layer
injection molding
preforming
viscosity
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.)
Ceased
Application number
DE201110000178
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German (de)
Inventor
Christopherus Bader
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.)
Priamus System Technologies AG
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Priamus System Technologies AG
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 Priamus System Technologies AG filed Critical Priamus System Technologies AG
Priority to DE201110000178 priority Critical patent/DE102011000178A1/en
Priority to CN2012800123246A priority patent/CN103415383A/en
Priority to US13/979,983 priority patent/US9821499B2/en
Priority to PCT/EP2012/050571 priority patent/WO2012098077A2/en
Publication of DE102011000178A1 publication Critical patent/DE102011000178A1/en
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
    • G01N11/02—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by measuring flow of the material
    • G01N11/04—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by measuring flow of the material through a restricted passage, e.g. tube, aperture
    • G01N11/06—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by measuring flow of the material through a restricted passage, e.g. tube, aperture by timing the outflow of a known quantity
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/76—Measuring, controlling or regulating
    • B29C45/7646—Measuring, controlling or regulating viscosity
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/76—Measuring, controlling or regulating
    • B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/76—Measuring, controlling or regulating
    • B29C45/78—Measuring, controlling or regulating of temperature
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1642—Making multilayered or multicoloured articles having a "sandwich" structure
    • B29C45/1646—Injecting parison-like articles
    • B29C2045/1648—Injecting parison-like articles the parison core layer being a barrier material
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76003—Measured parameter
    • B29C2945/76006—Pressure
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76003—Measured parameter
    • B29C2945/7604—Temperature
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76177—Location of measurement
    • B29C2945/76254—Mould
    • B29C2945/76257—Mould cavity
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76344—Phase or stage of measurement
    • B29C2945/76381—Injection
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76451—Measurement means
    • B29C2945/76454—Electrical, e.g. thermocouples
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76451—Measurement means
    • B29C2945/76481—Strain gauges
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76822—Phase or stage of control
    • B29C2945/76859—Injection

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • General Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

The method involves determining viscosity such as shear rate of polymer melt in injection molding tool using sensor by preforming melt with barrier layer. An independent claim is included for sensor for monitoring melt of cavity.

Description

Die Erfindung betrifft ein Verfahren zum Herstellen von mehrlagigen Gegenständen aus einer Kunststoffschmelze, insbesondere in einem Spritzgiesswerkzeug, insbesondere von Vorformlingen mit einer Barriereschicht, wobei eine Viskosität, insbesondere eine Schergeschwindigkeit, der Schmelze ermittelt wird.The invention relates to a method for producing multilayer articles from a plastic melt, in particular in an injection mold, in particular of preforms with a barrier layer, wherein a viscosity, in particular a shear rate, of the melt is determined.

Stand der TechnikState of the art

Grundsätzlich wird in der WO 2009/040077 A1 ein Verfahren zum Überwachen, Dokumentieren und/oder Regeln einer Spritzgiessmaschine mit einem Spritzgiesswerkzeug, in das eine Schmelze eingeführt wird, beschrieben, wobei eine Viskosität der Schmelze in dem Spritzgiesswerkzeug direkt ermittelt wird. Dabei erfolgt die Bestimmung der Viskosität durch die jeweiligen Quotienten aus Schubspannung und Schergeschwindigkeit anhand von Druckdifferenzen, der Geometrie der Kavität und der Fliessgeschwindigkeit der Schmelze. Zur Bestimmung könnte beispielsweise Werkzeuginnendrucksensoren bzw. Werkzeugwandtemperatursensoren verwendet werden.Basically, in the WO 2009/040077 A1 a method for monitoring, documenting and / or regulating an injection molding machine with an injection mold into which a melt is introduced, described, wherein a viscosity of the melt is determined directly in the injection mold. The determination of the viscosity is effected by the respective quotients of shear stress and shear rate on the basis of pressure differences, the geometry of the cavity and the flow velocity of the melt. For example, cavity pressure sensors or tool wall temperature sensors could be used for the determination.

Aufgabe der ErfindungObject of the invention

Aufgabe der Erfindung ist es, den in der WO 2009/040077 beschriebenen Grundgedanken für weitere Verfahren und Anwendungen zugänglich zu machen.The object of the invention is that in the WO 2009/040077 described principles for further methods and applications.

Lösung der AufgabeSolution of the task

Zur Lösung der Aufgabe führt, dass die Viskosität, insbesondere die Schergeschwindigkeit, von zumindest einer Lage in dem Spritzgiesswerkzeug ermittelt wird.To achieve the object, the viscosity, in particular the shear rate, of at least one layer in the injection molding tool is determined.

Bei der Herstellung von insbesondere PET-Flaschen, wie sie millionenfach in der Getränkeindustrie verwendet werden, werden üblicherweise sogenannte Vorformlinge im Spritzverfahren hergestellt, die anschliessend in einem Blasverfahren zur endgültigen Flasche geformt werden. Bereits beim Spritzgiessen des Vorformlings wird oft (ähnlich wie bei der Coextrusion) eine sogenannte Barriereschicht aus einem zweiten, ebenfalls transparenten Material im Zentrum der Schmelze eingespritzt. Diese Schicht soll verhindern, dass die Kohlensäure frühzeitig aus der Flasche entweicht und das Produkt nicht mehr verkäuflich ist. Problematisch ist dies beispielsweise bei sehr langen Transportwegen. Beschrieben wird die Herstellung von derartigen Vorformlingen beispielsweise in der EP 1 980 493 .In the production of, in particular, PET bottles, which are used by the millions in the beverage industry, so-called preforms are usually produced by injection molding, which are then blow-molded into the final bottle. Already during injection molding of the preform, a so-called barrier layer of a second, likewise transparent material is often injected in the center of the melt (similar to coextrusion). This layer is intended to prevent the carbon dioxide escaping from the bottle at an early stage and the product is no longer salable. This is problematic, for example, for very long transport routes. Described is the production of such preforms, for example in the EP 1 980 493 ,

Aus technischer Sicht besteht die Schwierigkeit darin, zu erkennen, ob und warm die Barriereschicht wirklich auch bis zum Flaschenhals, d. h., bis zum Bereich der Verschraubung, vorhanden ist, da dies optisch aufgrund der Transparenz der Schichten nicht erkennbar ist.From a technical point of view, the difficulty lies in recognizing whether and how warm the barrier layer really is, even down to the bottleneck. h., To the region of the screw, is present, since this is not visible visually due to the transparency of the layers.

Die vorliegende Erfindung bietet nun eine vergleichsweise einfache Lösung über die Messung, Überwachung und Regelung der Viskosität und hier insbesondere der Schergeschwindigkeit im Bereich der Verschraubung. Der Grundgedanke besteht darin, dass sich das Strömungsprofil grundsätzlich ändert, wenn anstatt zweier verschiedener Schmelzen nur eine Schmelze diesen Bereich durchströmt. Da sich das Einspritzvolumen jeder einzelnen Komponente bzw. jeder einzelnen Lage während dieses Vorgangs nicht ändert, muss sich zwangsläufig die Schergeschwindigkeit der einzelnen Lagen ändern. Bei einer tieferen Schergeschwindigkeit fehlt die Barriereschicht, bei einer höheren, „optimierten” Schergeschwindigkeit ist sie vorhanden. Bevorzugt wird natürlich die Schergeschwindigkeit jeder Lage überwacht, so dass zwischen der eigentlichen Kunststofflage und der Barrierelage sehr genau unterschieden wird.The present invention now provides a comparatively simple solution via the measurement, monitoring and control of the viscosity and in particular the shear rate in the region of the screw connection. The basic idea is that the flow profile basically changes when, instead of two different melts, only one melt flows through this area. Since the injection volume of each individual component or each individual layer does not change during this process, the shear rate of the individual layers must inevitably change. At a lower shear rate the barrier layer is missing, at a higher, "optimized" shear rate it is present. Preferably, of course, the shear rate of each layer is monitored so that a very accurate distinction is made between the actual plastic layer and the barrier layer.

Um nur die Schergeschwindigkeit zu ermitteln, wäre es denkbar, irgendeine Kombination von Druck- und Temperatursensoren zu verwenden, da vor allem die Zeitdifferenz ermittelt wird, die die Schmelze benötigt, um den Fliessweg zwischen den beiden Sensoren zu durchströmen. Die einfachste und kostengünstigste Variante wäre die Anordnung von zwei Temperatursensoren, da diese einerseits klein und andererseits auch günstiger sind als Drucksensoren.In order to determine only the shear rate, it would be conceivable to use any combination of pressure and temperature sensors, as above all the time difference is determined, which requires the melt to flow through the flow path between the two sensors. The simplest and most cost-effective variant would be the arrangement of two temperature sensors, since they are both small and cheaper than pressure sensors.

Im Rahmen der vorliegenden Erfindung sollen nun die Sensoren kombiniert werden. Das bedeutet, dass der Sensor ein Sensorgehäuse aufweist, in dem sich zumindest zwei Sensoren befinden. Dabei kann es sich um eine beliebige Kombination von Druck- und Temperatursensoren handeln, je nach dem, was wünschenswert ist. Auf diese Weise wird ein Viskositätssensor bzw. ein Schergeschwindigkeitssensor realisiert, der auf sehr einfache Art und Weise in der Werkzeugwand einer Kavität angeordnet werden kann. Dabei ist auch gleichzeitig der Abstand der beiden Sensoren voneinander bestimmt und festgelegt. Er braucht weder nachträglich ermittelt noch nachträglich eingestellt werden.In the context of the present invention, the sensors are now to be combined. This means that the sensor has a sensor housing in which there are at least two sensors. This can be any combination of pressure and temperature sensors, depending on what is desirable. In this way, a viscosity sensor or a shear rate sensor is realized, which can be arranged in a very simple manner in the mold wall of a cavity. At the same time, the distance of the two sensors from each other is determined and determined. It does not need to be determined retrospectively or postponed.

ZITATE ENTHALTEN IN DER BESCHREIBUNG QUOTES INCLUDE IN THE DESCRIPTION

Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Zitierte PatentliteraturCited patent literature

  • WO 2009/040077 A1 [0002] WO 2009/040077 A1 [0002]
  • WO 2009/040077 [0003] WO 2009/040077 [0003]
  • EP 1980493 [0005] EP 1980493 [0005]

Claims (3)

Verfahren zum Herstellen von mehrlagigen Gegenständen aus einer Kunststoffschmelze, insbesondere in einem Spritzgiesswerkzeug, insbesondere von Vorformlingen mit einer Barriereschicht, wobei eine Viskosität, insbesondere eine Schergeschwindigkeit, der Schmelze ermittelt wird, dadurch gekennzeichnet, dass die Viskosität, insbesondere die Schergeschwindigkeit, von zumindest einer Lage in dem Spritzgiesswerkzeug ermittelt wird.A method for producing multilayer articles from a plastic melt, in particular in an injection mold, in particular of preforms with a barrier layer, wherein a viscosity, in particular a shear rate of the melt is determined, characterized in that the viscosity, in particular the shear rate, of at least one layer is determined in the injection mold. Verwendung eines Verfahrens zum Ermitteln der Viskosität einer Kunststoffschmelze in einem Spritzgiesswerkzeug nach WO 2009/040077 A1 zur Herstellung von mehrlagigen Gegenständen, insbesondere von Vorformlingen mit einer Barriereschicht, wobei die Viskosität, insbesondere die Schergeschwindigkeit von zumindest einer Lage ermittelt wird.Use of a method for determining the viscosity of a plastic melt in an injection mold after WO 2009/040077 A1 for producing multilayer objects, in particular preforms with a barrier layer, wherein the viscosity, in particular the shear rate of at least one layer is determined. Sensor zum Überwachen einer Schmelze in einer Kavität, wobei der Sensor in einem Gehäuse angeordnet ist, dadurch gekennzeichnet, dass neben dem Sensor in dem Gehäuse beabstandet ein zweiter Sensor vorgesehen ist.Sensor for monitoring a melt in a cavity, wherein the sensor is arranged in a housing, characterized in that spaced apart from the sensor in the housing, a second sensor is provided.
DE201110000178 2011-01-17 2011-01-17 Method for manufacturing multilayer articles made of plastic melt, involves determining viscosity of polymer melt in injection molding tool by preforming melt with barrier layer Ceased DE102011000178A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE201110000178 DE102011000178A1 (en) 2011-01-17 2011-01-17 Method for manufacturing multilayer articles made of plastic melt, involves determining viscosity of polymer melt in injection molding tool by preforming melt with barrier layer
CN2012800123246A CN103415383A (en) 2011-01-17 2012-01-16 Method for producing multilayer objects
US13/979,983 US9821499B2 (en) 2011-01-17 2012-01-16 Process for producing multilayered articles
PCT/EP2012/050571 WO2012098077A2 (en) 2011-01-17 2012-01-16 Method for producing multilayer objects

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201110000178 DE102011000178A1 (en) 2011-01-17 2011-01-17 Method for manufacturing multilayer articles made of plastic melt, involves determining viscosity of polymer melt in injection molding tool by preforming melt with barrier layer

Publications (1)

Publication Number Publication Date
DE102011000178A1 true DE102011000178A1 (en) 2012-07-19

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DE201110000178 Ceased DE102011000178A1 (en) 2011-01-17 2011-01-17 Method for manufacturing multilayer articles made of plastic melt, involves determining viscosity of polymer melt in injection molding tool by preforming melt with barrier layer

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1980493A2 (en) 1999-08-06 2008-10-15 Plastipak Packaging, Inc. Plastic container having a carbon-treated internal surface
WO2009040077A1 (en) 2007-09-20 2009-04-02 Priamus System Technologies Ag Method and device for monitoring, documenting, and/or controlling an injection molding machine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1980493A2 (en) 1999-08-06 2008-10-15 Plastipak Packaging, Inc. Plastic container having a carbon-treated internal surface
WO2009040077A1 (en) 2007-09-20 2009-04-02 Priamus System Technologies Ag Method and device for monitoring, documenting, and/or controlling an injection molding machine

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