EP0407927A2 - Method for continously measuring the color of colored plastic granulates - Google Patents

Method for continously measuring the color of colored plastic granulates Download PDF

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Publication number
EP0407927A2
EP0407927A2 EP90113038A EP90113038A EP0407927A2 EP 0407927 A2 EP0407927 A2 EP 0407927A2 EP 90113038 A EP90113038 A EP 90113038A EP 90113038 A EP90113038 A EP 90113038A EP 0407927 A2 EP0407927 A2 EP 0407927A2
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EP
European Patent Office
Prior art keywords
measuring
plastic
pigment
light source
color
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EP90113038A
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German (de)
French (fr)
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EP0407927A3 (en
EP0407927B1 (en
Inventor
Detlef Klaus Busch
Horst Grohmann
Harald Kutzner
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Hoechst AG
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Hoechst AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/20—Measuring; Control or regulation
    • B01F35/21—Measuring
    • B01F35/2131—Colour or luminescence
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/20—Measuring; Control or regulation
    • B01F35/22—Control or regulation
    • B01F35/2201—Control or regulation characterised by the type of control technique used
    • B01F35/2202—Controlling the mixing process by feed-back, i.e. a measured parameter of the mixture is measured, compared with the set-value and the feed values are corrected
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/80—Forming a predetermined ratio of the substances to be mixed
    • B01F35/82—Forming a predetermined ratio of the substances to be mixed by adding a material to be mixed to a mixture in response to a detected feature, e.g. density, radioactivity, consumed power or colour
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/60—Mixing solids with solids

Definitions

  • the invention relates to a method for producing a colored plastic molding compound, in which the color of the molding compound is measured continuously and the measurement signals are used indirectly to regulate the mixing ratio of plastic and color pigment.
  • a mixture of polymer and pigment In the known process for producing colored plastic granules, a mixture of polymer and pigment, the latter mostly in the form of a concentrate, and, if appropriate, auxiliaries, is introduced into the granulating system and processed into granules. Samples are taken from the granules and formed into test specimens on which the color tone is assessed visually or colorimetrically. If necessary, the mixing ratio of polymer to pigment is then changed. This change is made until the color of the granules matches the intended color.
  • the invention thus relates to a process for producing a colored plastic molding compound by mixing at least one pigment into the plastic, characterized in that samples are taken continuously from the dry colored molding compound and passed past a light source, in the light reflected by the surface of the molding compound particles the colors green, blue and red are measured and the measurement signals are converted into control signals for controlling the metering devices for the pigment and the plastic.
  • the invention further relates to a method for continuously measuring the hue of a colored plastic molding composition by illuminating the surface of the molding compound particles with a light source and measuring the colors green, blue and red in the light reflected from the surface of the molding compound particles, characterized in that the molding compound particles in a tight packing by the measuring device at the measuring window.
  • the invention relates to the device for the continuous measurement of the color of a colored plastic molding composition consisting of a storage container (61), a measuring tube (62) adjoining it, into which a glass measuring window (63) is embedded, a light source (64) outside the tube (62) in front of the measuring window (63) and a sensor group (66).
  • Light source (64) and sensor group (66) can be arranged side by side. They are preferably combined by introducing light into an optical waveguide bundle (67) and continuing the reflected light. In this case, the light source (64) and sensor group (66) are in a separate housing.
  • samples are continuously taken from the stream of dry colored material behind the mixing plant.
  • the molding compound can have been obtained by various processes, it is essential that it is dry on the surface and cannot form condensation water during the measurement.
  • Sampling can be carried out fully continuously by branching off a small part of the material flow, but it can also be carried out continuously at intervals. Samples are preferably taken from the material flow at regular time intervals, for example by suction.
  • the material sampler is conveyed from the sampler to the storage container of the measuring device.
  • the measuring device consists of a tube with a round or angular cross-section, in the wall of which a window closed with a glass plate is attached. At one end the tube is designed as a storage container, at the other end it is connected to a device which empties the tube evenly and at the same time forms a barrier against vapors or gases that may come from the main flow of the molding compound.
  • a cellular wheel sluice is advantageously used.
  • a light source with an almost constant color temperature, for example one Halogen lamp attached. It illuminates the molding compound particles in the tube. The light reflected by the particles is picked up by three sensors that are sensitive to the colors green, blue or red.
  • the measuring tube Due to the interaction of the storage container and the emptying device, the measuring tube is always kept full and the molding compound particles are packed tightly. This is essential for the evaluation of the measurement signals from the probes.
  • the changes in the moving molding compound surface are averaged out by constant averaging over the individual measurement signals in a computing and control unit.
  • This "constant mean value” is compared with a calibration mean value, which is available as a target value by measuring and storing a calibration sample from the control. The difference between the setpoint and actual value is used to control the dosing equipment of the mixing plant.
  • the figures show the process according to the invention in a flow chart and the measuring device used for the process in the preferred use for plastic granules.
  • These granules have a round or rectangular cross section, a diameter of 1 to 5 mm and a length of the particles of 0.5 to 5 mm.
  • a constant stream (2) of dry colored granulate flows out of the granulating system (1).
  • the sampler (3) regularly takes samples through line (4) and conveys them through line (5) into the measuring device (6), from which they are drawn off by the emptying device (8) through line (7) and through line (9) the granulate stream (2) are fed again.
  • the signals obtained on the measuring device (6) are processed to guide values in the computer (10) and the dosing control device (11).
  • the control signals determined in the control device (11) are transmitted to the pelletizing system (1) via the lines (12) and (13).
  • FIG. 2 shows a measuring device in a preferred form.
  • the sampler (3), a suction fan and the emptying device (8), a cellular wheel sluice, are attached directly to the measuring device (6).
  • Lines (5) and (7) are thus omitted and line (4) ends directly in the storage container (61) of the measuring device (6).
  • a light source (64) illuminates the surface of the granules (65) being passed through the optical fiber bundle (67).
  • the reflected light is collected by the sensor group (66) and given separately to the computer (10) (not shown) according to the proportions of the colors green, blue and red as electrical signals.
  • Correct color measurement on the granulate is strongly dependent on the speed at which the granulate flows past the measurement window.
  • the minimum speed was 1 cm / sec.
  • the color temperature consistency of the halogen lamp is guaranteed with a corresponding brightness control that adjusts the lamp voltage (in this case approx. 6V).
  • the output voltage range of the three color sensors is 0 ... 10V each.
  • the signals are digitized in an A / D converter (12bit), smoothed by averaging and fed to the granule brightness calculation. This means that 4 values are available for color determination; 3 measured values from the selective color frequency measurements and the calculated brightness value. These are compared in a computer with the stored values of the desired granulate color and processed for further processing.
  • a high resolution for the range of the setpoint is necessary in order to recognize even the smallest deviations in the actual value. This is achieved with signal spreading.
  • the voltage signal is ⁇ ⁇ 100 mV.

Abstract

In the case of the present method, the colour of the material is continuously measured and the measuring signals are used indirectly for controlling the mixing ratio of plastic and pigment. For this purpose, samples are continuously taken from the material flow downstream of the mixing system (1) and this material is taken closely packed through the measuring device (6) past the measuring window. The surface of the material particles is illuminated by the measuring window and the reflected light is captured by sensors, which allow the colours green, blue and red to be measured. The processing of the measuring signals to form control signals for the metering systems in the mixing system takes place by computer. The method is suitable in particular for making coloured plastic granules. <IMAGE>

Description

Die Erfindung bezieht sich auf ein Verfahren zur Herstellung einer farbigen Kunststoff-Formmasse, bei welchem die Farbe der Formmasse kontinuierlich gemessen und die Meßsignale indirekt zum Regeln des Mischverhältnisses von Kunststoff und Farbpigment verwendet werden.The invention relates to a method for producing a colored plastic molding compound, in which the color of the molding compound is measured continuously and the measurement signals are used indirectly to regulate the mixing ratio of plastic and color pigment.

Beim bekannten Verfahren zur Herstellung farbiger Kunststoffgranulate wird ein Gemisch von Polymer und Pigment, letzteres meist als Konzentrat, und gegebenenfalls Hilfsstoffen in die Granulieranlage eingeführt und zu einem Granulat verarbeitet. Von dem Granulat werden Proben genommen und zu Prüfkörpern geformt, an denen der Farbton visuell oder farbmetrisch beurteilt wird. Gegebenenfalls wird danach das Mischungsverhältnis von Polymer zu Pigment geändert. Diese Änderung wird solange vorgenommen, bis der Farbton des Granulats mit dem vorgesehenen Farbton übereinstimmt.In the known process for producing colored plastic granules, a mixture of polymer and pigment, the latter mostly in the form of a concentrate, and, if appropriate, auxiliaries, is introduced into the granulating system and processed into granules. Samples are taken from the granules and formed into test specimens on which the color tone is assessed visually or colorimetrically. If necessary, the mixing ratio of polymer to pigment is then changed. This change is made until the color of the granules matches the intended color.

Wegen des Zeitaufwandes für die Herstellung der Prüfkörper und ihre Untersuchung können Störungen, wie sie beispielsweise durch Unterschiede zwischen den Pigmentchargen verursacht werden, nur nach längerer Zeit erkannt werden. Dies hat zur Folge, daß der Anteil an nicht qualitätsgerechter Ware mehrere Prozent betragen kann. Insbesondere für die Herstellung von Endprodukten, für die farbgleiche Einzelteile aus Granulaten verschiedener Produktionen bzw. Produktionsanlagen benötigt werden, ist eine stetige Nachführung des Farbtons während der Polymereinfärbung erforderlich, damit die Schwankungsbreite der Farbtonabweichung vom Muster gegen Null geht. Um dies zu erreichen, müssen in einem aufwendigen zusätzlichen Verfahrensschritt die Granulatchargen homogenisiert werden.Because of the time it takes to manufacture the test specimens and examine them, faults, such as those caused by differences between the pigment batches, can only be recognized after a long time. The result of this is that the proportion of goods that are not of the right quality can amount to several percent. In particular for the production of end products, for which color-identical individual parts from granules of different productions or production plants are required, a constant adjustment of the color tone during the polymer coloring is necessary so that the fluctuation range of the color deviation from the sample goes to zero. To achieve this, the granulate batches must be homogenized in a complex additional process step.

Es bestand daher die Aufgabe, den Farbton von Kunststoff-­Formmassen, insbesondere Kunststoffgranulaten kontinuierlich während der Produktion zu bestimmen und die Meßergebnisse möglichst umgehend zur Steuerung der Polymer- und Pigmentdosierung nutzbar zu machen.It was therefore the task of continuously determining the color of plastic molding compositions, in particular plastic granules, during production and of making the measurement results usable as quickly as possible for controlling the polymer and pigment metering.

Es wurde gefunden, daß eine kontinuierliche Messung des Farbtons der Formmasse möglich ist, wenn man die Formmassenteilchen in geeigneter Weise an der Meßeinrichtung vorbeiführt.It has been found that a continuous measurement of the color tone of the molding compound is possible if the molding compound particles are passed in a suitable manner past the measuring device.

Die Erfindung betrifft somit ein Verfahren zur Herstellung einer farbigen Kunststoff-Formmasse durch Einmischen mindestens eines Pigmentes in den Kunststoff, dadurch gekennzeichnet, daß der trocknen farbigen Formmasse kontinuierlich Proben entnommen und an einer Lichtquelle vorbeigeführt werden, wobei in dem von der Oberfläche der Formmassenteilchen reflektierten Licht die Farben Grün, Blau und Rot gemessen werden und die Meßsignale in Steuersignale zur Steuerung der Dosiereinrichtungen für das Pigment und den Kunststoff umgewandelt werden.The invention thus relates to a process for producing a colored plastic molding compound by mixing at least one pigment into the plastic, characterized in that samples are taken continuously from the dry colored molding compound and passed past a light source, in the light reflected by the surface of the molding compound particles the colors green, blue and red are measured and the measurement signals are converted into control signals for controlling the metering devices for the pigment and the plastic.

Die Erfindung betrifft weiterhin ein Verfahren zum kontinuierlichen Messen des Farbtons einer farbigen Kunststoff-Formmasse durch Beleuchten der Oberfläche der Formmassenteilchen mit einer Lichtquelle und Messen der Farben Grün, Blau und Rot in dem von der Oberfläche der Formmassenteilchen reflektierten Licht, dadurch gekennzeichnet, daß die Formmassenteilchen in dichter Packung durch die Meßvorrichtung am Meßfenster vorbeigeführt werden.The invention further relates to a method for continuously measuring the hue of a colored plastic molding composition by illuminating the surface of the molding compound particles with a light source and measuring the colors green, blue and red in the light reflected from the surface of the molding compound particles, characterized in that the molding compound particles in a tight packing by the measuring device at the measuring window.

Die Erfindung betrifft schließlich die Vorrichtung zum kontinuierlichen Messen des Farbtons einer farbigen Kunststoff-Formmasse bestehend aus einem Vorratsbehälter (61), einem daran anschließenden Meßrohr (62), in welches ein Meßfenster (63) aus Glas eingelassen ist, einer außerhalb des Rohres (62) vor dem Meßfenster (63) befindlichen Lichtquelle (64) und einer Sensorgruppe (66). Lichtquelle (64) und Sensorgruppe (66) können nebeneinander angeordnet sein. Vorzugsweise sind sie kombiniert, indem in einem Lichtwellenleiterbündel (67) Licht herangeführt und das reflektierte Licht fortgeführt wird. In diesem Falle befinden sich Lichtquelle (64) und Sensorgruppe (66) in einem separaten Gehäuse.Finally, the invention relates to the device for the continuous measurement of the color of a colored plastic molding composition consisting of a storage container (61), a measuring tube (62) adjoining it, into which a glass measuring window (63) is embedded, a light source (64) outside the tube (62) in front of the measuring window (63) and a sensor group (66). Light source (64) and sensor group (66) can be arranged side by side. They are preferably combined by introducing light into an optical waveguide bundle (67) and continuing the reflected light. In this case, the light source (64) and sensor group (66) are in a separate housing.

Für das erfindungsgemäße Verfahren werden hinter der Mischanlage dem Strom des trocknen farbigen Materials kontinuierlich Proben entnommen. Die Formmasse kann nach verschiedenen Verfahren gewonnen worden sein, wesentlich ist, daß sie oberflächlich trocken ist und bei der Messung kein Kondenswasser bilden kann. Die Probenentnahme kann vollkontinuierlich erfolgen, indem ein kleiner Teil des Materialstromes abgezweigt wird, sie kann jedoch auch kontinuierlich in Zeitabständen durchgeführt werden. Vorzugsweise werden dem Materialstrom in regelmäßigen Zeitabständen Proben entnommen, beispielsweise durch Absaugen. Vom Probennehmer werden die Materialproben zum Vorratsbehälter der Meßvorrichtung gefördert.For the method according to the invention, samples are continuously taken from the stream of dry colored material behind the mixing plant. The molding compound can have been obtained by various processes, it is essential that it is dry on the surface and cannot form condensation water during the measurement. Sampling can be carried out fully continuously by branching off a small part of the material flow, but it can also be carried out continuously at intervals. Samples are preferably taken from the material flow at regular time intervals, for example by suction. The material sampler is conveyed from the sampler to the storage container of the measuring device.

Die Meßvorrichtung besteht aus einem Rohr mit rundem oder eckigem Querschnitt, in dessen Wand ein mit einer Glasplatte verschlossenes Fenster angebracht ist. An einem Ende ist das Rohr als Vorratsbehälter ausgebildet, am anderen Ende ist es mit einer Einrichtung verbunden, welche das Rohr gleichmäßig entleert und gleichzeitig eine Sperre gegen eventuell vom Hauptstrom der Formmasse kommende Dämpfe oder Gase bildet. Vorteilhaft wird eine Zellenradschleuse verwendet.The measuring device consists of a tube with a round or angular cross-section, in the wall of which a window closed with a glass plate is attached. At one end the tube is designed as a storage container, at the other end it is connected to a device which empties the tube evenly and at the same time forms a barrier against vapors or gases that may come from the main flow of the molding compound. A cellular wheel sluice is advantageously used.

Vor dem Meßfenster ist eine Lichtquelle mit nahezu konstanter Farbtemperatur, beispielsweise eine Halogenlampe, angebracht. Sie beleuchtet die in dem Rohr befindlichen Formmassenteilchen. Das von den Teilchen reflektierte Licht wird von drei Sensoren aufgenommen, die für die Farben Grün, Blau oder Rot empfindlich sind.In front of the measuring window is a light source with an almost constant color temperature, for example one Halogen lamp attached. It illuminates the molding compound particles in the tube. The light reflected by the particles is picked up by three sensors that are sensitive to the colors green, blue or red.

Durch das Zusammenwirken von Vorratsbehälter und Entleerungseinrichtung wird das Meßrohr immer gefüllt gehalten und die Formmassenteilchen befinden sich in dichter Packung. Dies ist wesentlich für die Auswertung der Meßsignale aus den Sonden. Durch eine ständige Mittelwertbildung über die einzelnen Meßsignale in einer Rechen- und Steuereinheit werden die Änderungen der bewegten Formmassenoberfläche (Schattenbildung und Zwickelräume) herausgemittelt. Dieser "ständige Mittelwert" wird einem Eichmittelwert, der durch Messung und Speicherung einer Eichprobe der Steuerung als Sollwert vorliegt, gegenübergestellt. Die Differenz aus Soll- und Istwert wird zur Steuerung der Dosiereinrichtungen der Mischanlage eingesetzt.Due to the interaction of the storage container and the emptying device, the measuring tube is always kept full and the molding compound particles are packed tightly. This is essential for the evaluation of the measurement signals from the probes. The changes in the moving molding compound surface (shadow formation and gusset spaces) are averaged out by constant averaging over the individual measurement signals in a computing and control unit. This "constant mean value" is compared with a calibration mean value, which is available as a target value by measuring and storing a calibration sample from the control. The difference between the setpoint and actual value is used to control the dosing equipment of the mixing plant.

Die Figuren zeigen das erfindungsgemäße Verfahren im Fließbild und die für das Verfahren verwendete Meßvorrichtung in der bevorzugten Verwendung für Kunststoffgranulate. Diese Granulate haben einen runden oder rechteckigen Querschnitt, einen Durchmesser von 1 bis 5 mm und eine Länge der Teilchen von 0,5 bis 5 mm.The figures show the process according to the invention in a flow chart and the measuring device used for the process in the preferred use for plastic granules. These granules have a round or rectangular cross section, a diameter of 1 to 5 mm and a length of the particles of 0.5 to 5 mm.

Gemäß Figur 1 fließt aus der Granulieranlage (1) ein konstanter Strom (2) trocknen farbigen Granulats. Der Probennehmer (3) entnimmt durch Leitung (4) regelmäßig Proben und fördert sie durch Leitung (5) in die Meßvorrichtung (6), aus der sie durch die Entleerungseinrichtung (8) durch die Leitung (7) abgezogen und durch Leitung (9) dem Granulatstrom (2) wieder zugeführt werden. Die an der Meßvorrichtung (6) gewonnenen Signale werden im Rechner (10) zu Führungswerten verarbeitet und der Dosierregeleinrichtung (11) aufgeschaltet. Die in der Regeleinrichtung (11) ermittelten Stellsignale werden über die Leitungen (12) und (13) zur Granulieranlage (1) übermittelt.According to FIG. 1, a constant stream (2) of dry colored granulate flows out of the granulating system (1). The sampler (3) regularly takes samples through line (4) and conveys them through line (5) into the measuring device (6), from which they are drawn off by the emptying device (8) through line (7) and through line (9) the granulate stream (2) are fed again. The signals obtained on the measuring device (6) are processed to guide values in the computer (10) and the dosing control device (11). The control signals determined in the control device (11) are transmitted to the pelletizing system (1) via the lines (12) and (13).

In Figur 2 wird eine Meßvorrichtung in einer bevorzugten Form gezeigt. Der Probennehmer (3), ein Saugggebläse und die Entleerungseinrichtung (8), eine Zellenradschleuse, sind direkt an die Meßvorrichtung (6) angebaut. Die Leitungen (5) und (7) entfallen somit und Leitung (4) endet direkt im Vorratsbehälter (61) der Meßvorrichtung (6). An den Vorratsbehälter (61) schließt sich das Meßrohr (62) an, in welchem das Meßfenster (63) aus Glas eingelassen ist. Durch dieses Meßfenster (63) beleuchtet eine Lichtquelle (64) durch das Lichtwellenleiterbündel (67) die Oberfläche des vorbeigeführten Granulats (65). Das reflektierte Licht wird von der Sensorgruppe (66) aufgefangen und getrennt nach den Anteilen der Farben Grün, Blau und Rot als elektrische Signale an den (nicht gezeigten) Rechner (10) gegeben.FIG. 2 shows a measuring device in a preferred form. The sampler (3), a suction fan and the emptying device (8), a cellular wheel sluice, are attached directly to the measuring device (6). Lines (5) and (7) are thus omitted and line (4) ends directly in the storage container (61) of the measuring device (6). The measuring tube (62), in which the measuring window (63) made of glass is embedded, adjoins the storage container (61). Through this measuring window (63), a light source (64) illuminates the surface of the granules (65) being passed through the optical fiber bundle (67). The reflected light is collected by the sensor group (66) and given separately to the computer (10) (not shown) according to the proportions of the colors green, blue and red as electrical signals.

Eine korrekte Farbmessung am Granulat ist stark abhängig von der Geschwindigkeit, mit der das Granulat am Meßfenster vorbeifließt. Als Mindestgeschwindigkeit wurden 1 cm/sec ermittelt. Die Farbtemperaturkonstanz der Halogenlampe wird mit einer entsprechenden Helligkeitsregelung gewährleistet, die die Lampenspannung (im vorliegenden Fall ca. 6V-) nachführt. Der Ausgangsspannungsbereich der drei Farbsensoren beträgt je 0...10V. In einem A/D-Wandler (12bit) werden die Signale digitalisiert, über eine Mittelwertbildung geglättet und der Granulathelligkeitsberechnung zugeführt. Damit stehen 4 Werte für die Farbbestimmung zur Verfügung; 3 Meßwerte aus den selektiven Farbfreguenzmessungen und der berechnete Helligkeitswert. Diese werden in einem Rechner mit den gespeicherten Werten der gewünschten Granulatfarbe verglichen und für die Weiterverarbeitung aufbereitet.Correct color measurement on the granulate is strongly dependent on the speed at which the granulate flows past the measurement window. The minimum speed was 1 cm / sec. The color temperature consistency of the halogen lamp is guaranteed with a corresponding brightness control that adjusts the lamp voltage (in this case approx. 6V). The output voltage range of the three color sensors is 0 ... 10V each. The signals are digitized in an A / D converter (12bit), smoothed by averaging and fed to the granule brightness calculation. This means that 4 values are available for color determination; 3 measured values from the selective color frequency measurements and the calculated brightness value. These are compared in a computer with the stored values of the desired granulate color and processed for further processing.

Eine hohe Auflösung für den Bereich des Sollwertes ist notwendig, um auch kleinste Abweichungen des Istwertes zu erkennen. Dieses wird mit einer Signalspreizung erreicht. Erfahrungsgemäß liegt das Spannungssignal bei ≧ ± 100 mV. Die so ermittelte Führungsgröße für die Farbeinstellung wird einer entsprechenden Regeleinrichtung zugeführt, die wiederum eine Anpassung für die Stellsignale der eingebauten Dosiereinrichtung vornimmt. Diese entsprechen den in der Meßtechnik üblichen Werten 0/2......10V oder 0/4...20mA.A high resolution for the range of the setpoint is necessary in order to recognize even the smallest deviations in the actual value. This is achieved with signal spreading. Experience has shown that the voltage signal is ≧ ± 100 mV. The reference variable thus determined for the color setting is fed to a corresponding control device, which in turn adapts the control signals of the built-in metering device. These correspond to the values 0/2 ...... 10V or 0/4 ... 20mA which are common in measuring technology.

Durch die Regelung des Dosierverhältnisses von Polymer und der/den farbgebenden Polymerpigmentmischung(en) wird eine konstante Produktqualität des Produktstroms erzielt, welche auf den konstanten und reproduzierbaren Meßwerten der Farbtonmessung an dem kontinuierlichen Probestrom basiert.By regulating the metering ratio of polymer and the coloring polymer pigment mixture (s), a constant product quality of the product stream is achieved, which is based on the constant and reproducible measurement values of the color measurement on the continuous sample stream.

Claims (5)

1. Verfahren zur Herstellung einer farbigen Kunststoff-Formmasse durch Einmischen mindestens eines Pigmentes in den Kunststoff dadurch gekennzeichnet, daß der trocknen farbigen Formmasse kontinuierlich Proben entnommen und an einer Lichtquelle vorbeigeführt werden, wobei in dem von der Oberfläche der Formmassenteilchen reflektierten Licht die Farben Grün, Blau und Rot gemessen werden und die Meßsignale in Steuersignale zur Steuerung der Dosiereinrichtungen für das Pigment und den Kunststoff umgewandelt werden.1. A process for the production of a colored plastic molding composition by mixing at least one pigment into the plastic, characterized in that the dry colored molding composition is continuously sampled and passed past a light source, the colors green being reflected in the light reflected from the surface of the molding composition particles, Blue and red are measured and the measurement signals are converted into control signals for controlling the metering devices for the pigment and the plastic. 2. Verfahren zur Herstellung eines farbigen Kunststoffgranulats durch Einmischen mindestens eines Pigmentes in den Kunststoff und Granulieren der Mischung, dadurch gekennzeichnet, daß dem trocknen farbigen Granulat kontinuierlich Proben entnommen und an einer Lichtquelle vorbeigeführt werden, wobei in dem von der Oberfläche des Granulats reflektierten Licht die Farben Grün, Blau und Rot gemessen werden und die Meßsignale in Steuersignale zur Steuerung der Dosiereinrichtungen für das Pigment und den Kunststoff umgewandelt werden.2. A process for producing colored plastic granules by mixing at least one pigment into the plastic and granulating the mixture, characterized in that samples are continuously taken from the dry colored granules and passed past a light source, the light reflected from the surface of the granules Colors green, blue and red are measured and the measurement signals are converted into control signals for controlling the metering devices for the pigment and the plastic. 3. Verfahren zum kontinuierlichen Messen des Farbtons einer farbigen Kunststoff-Formmasse durch Beleuchten der Oberfläche der Formmassenteilchen mit einer Lichtquelle und Messen der Farben Grün, Blau und Rot in dem von der Oberfläche der Formmassenteilchen reflektierten Licht, dadurch gekennzeichnet, daß die Formmassenteilchen in dichter Packung durch die Meßvorrichtung am Meßfenster vorbeigeführt werden.3. A method for continuously measuring the hue of a colored plastic molding compound by illuminating the surface of the molding compound particles with a light source and measuring the colors green, blue and red in the light reflected from the surface of the molding compound particles, characterized in that the molding compound particles in dense packing be guided past the measuring window by the measuring device. 4. Verfahren zum kontinuierlichen Messen des Farbtons eines farbigen Kunststoffgranulats durch Beleuchten der Oberfläche des Granulats mit einer Lichtquelle und Messen der Farben Grün, Blau und Rot in dem von der Oberfläche des Granulats reflektierten Licht, dadurch gekennzeichnet, daß das Granulat in dichter Packung durch die Meßvorrichtung am Meßfenster vorbeigeführt wird.4. Process for the continuous measurement of the color tone of a colored plastic granulate by illuminating the Surface of the granulate with a light source and measuring the colors green, blue and red in the light reflected from the surface of the granulate, characterized in that the granulate is guided past the measuring window in a tight packing by the measuring device. 5. Vorrichtung zum kontinuierlichen Messen des Farbtons einer farbigen Kunststoffformmasse bestehend aus einem Vorratsbehälter (61), einem daran anschließenden Meßrohr (62), in welches ein Meßfenster (63) aus Glas eingelassen ist, einer außerhalb des Rohres (62) vor dem Meßfenster (63) befindlichen Lichtquelle (64) und einer Sensorgruppe (66).5. Device for the continuous measurement of the color of a colored plastic molding composition consisting of a storage container (61), an adjoining measuring tube (62), into which a measuring window (63) made of glass is inserted, one outside the tube (62) in front of the measuring window ( 63) located light source (64) and a sensor group (66).
EP90113038A 1989-07-12 1990-07-07 Method for continously measuring the color of colored plastic granulates Expired - Lifetime EP0407927B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3922902 1989-07-12
DE3922902A DE3922902A1 (en) 1989-07-12 1989-07-12 METHOD FOR PRODUCING A COLORED PLASTIC MOLD

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EP0407927A2 true EP0407927A2 (en) 1991-01-16
EP0407927A3 EP0407927A3 (en) 1992-07-22
EP0407927B1 EP0407927B1 (en) 1994-06-15

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EP (1) EP0407927B1 (en)
JP (1) JPH0345304A (en)
AT (1) ATE107190T1 (en)
AU (1) AU644086B2 (en)
CA (1) CA2020947A1 (en)
DE (2) DE3922902A1 (en)
ES (1) ES2056308T3 (en)
ZA (1) ZA905423B (en)

Cited By (10)

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EP0646409A1 (en) * 1993-10-04 1995-04-05 General Electric Company System for controlling the color of compounded polymer(s) using in-process color measurements
US5953129A (en) * 1996-07-03 1999-09-14 Basf Aktiengesellschaft Method and a device for the continuous colorimetry of plastics molding compounds
WO1999048602A1 (en) * 1998-03-26 1999-09-30 Renner Herrmann S.A. Apparatus and process for the continuous preparation of a fluid with automatic adjustment of the properties thereof
WO2002016892A2 (en) * 2000-08-22 2002-02-28 General Electric Company On-line color measurement system for cooled product
DE10219034A1 (en) * 2002-04-29 2003-11-13 Bayer Ag Color determination of plastic granulate material, comprises mixing the granulate with a fluid, allowing it to form a surface skin, and then carrying out an optical remission measurement
WO2009040291A1 (en) * 2007-09-21 2009-04-02 Basf Se Method and apparatus for measuring colour properties of plastic granules
DE102008013170A1 (en) * 2008-03-07 2009-09-10 Wobben, Aloys A method of adjusting a mixing ratio of two or more components
DE102011113543A1 (en) * 2011-09-15 2013-03-21 Klöckner Pentaplast GmbH & Co. KG Colored polymeric moldings, process and apparatus for producing the moldings
DE102019217090A1 (en) * 2019-11-06 2021-05-06 LIEB TGA GmbH Mixing device, casting device and method for operating a mixing device
CN113574363A (en) * 2019-03-26 2021-10-29 科思创知识产权两合公司 Method for determining colour values of transparent bulk material

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MX2021002331A (en) * 2018-08-29 2021-08-11 Erema Eng Recycling Maschinen & Anlagen Gmbh Method and apparatus for processing and/or recycling of materials.
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FR3126321A1 (en) * 2021-09-01 2023-03-03 L'Air Liquide Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude CONTINUOUS MIXING DEVICE AND ASSOCIATED METHOD
FR3127281B1 (en) * 2021-09-23 2023-08-25 Exel Ind Shade measuring device for a fluid distribution system
CN115382461B (en) * 2022-10-31 2023-05-12 东营市宝泽能源科技有限公司 Iron ion stabilizer production device and method with proportioning adjustment function

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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0646409A1 (en) * 1993-10-04 1995-04-05 General Electric Company System for controlling the color of compounded polymer(s) using in-process color measurements
US5559173A (en) * 1993-10-04 1996-09-24 General Electric Company System for controlling the color of compounded polymer(s) using in-process color measurements
US5953129A (en) * 1996-07-03 1999-09-14 Basf Aktiengesellschaft Method and a device for the continuous colorimetry of plastics molding compounds
WO1999048602A1 (en) * 1998-03-26 1999-09-30 Renner Herrmann S.A. Apparatus and process for the continuous preparation of a fluid with automatic adjustment of the properties thereof
US6533449B1 (en) 1998-03-26 2003-03-18 Renner Herrmann S.A. Apparatus and process for the continuous preparation of a fluid, utilizing a fluid recycling means including a buffer
WO2002016892A2 (en) * 2000-08-22 2002-02-28 General Electric Company On-line color measurement system for cooled product
WO2002016892A3 (en) * 2000-08-22 2002-05-10 Gen Electric On-line color measurement system for cooled product
US6469789B1 (en) 2000-08-22 2002-10-22 General Electric Company On-line color measurement system for cooled product
DE10219034A1 (en) * 2002-04-29 2003-11-13 Bayer Ag Color determination of plastic granulate material, comprises mixing the granulate with a fluid, allowing it to form a surface skin, and then carrying out an optical remission measurement
DE10219034B4 (en) * 2002-04-29 2004-04-08 Bayer Ag Method and device for determining the color of plastic granules
WO2009040291A1 (en) * 2007-09-21 2009-04-02 Basf Se Method and apparatus for measuring colour properties of plastic granules
DE102008013170A1 (en) * 2008-03-07 2009-09-10 Wobben, Aloys A method of adjusting a mixing ratio of two or more components
DE102011113543A1 (en) * 2011-09-15 2013-03-21 Klöckner Pentaplast GmbH & Co. KG Colored polymeric moldings, process and apparatus for producing the moldings
DE102011113543A8 (en) * 2011-09-15 2013-06-06 Klöckner Pentaplast GmbH & Co. KG Colored polymeric moldings, process and apparatus for producing the moldings
CN113574363A (en) * 2019-03-26 2021-10-29 科思创知识产权两合公司 Method for determining colour values of transparent bulk material
DE102019217090A1 (en) * 2019-11-06 2021-05-06 LIEB TGA GmbH Mixing device, casting device and method for operating a mixing device

Also Published As

Publication number Publication date
EP0407927A3 (en) 1992-07-22
JPH0345304A (en) 1991-02-26
DE59006110D1 (en) 1994-07-21
ATE107190T1 (en) 1994-07-15
ES2056308T3 (en) 1994-10-01
CA2020947A1 (en) 1991-01-13
DE3922902A1 (en) 1991-01-17
AU5887090A (en) 1991-01-17
EP0407927B1 (en) 1994-06-15
ZA905423B (en) 1991-04-24
AU644086B2 (en) 1993-12-02

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