DE102006052040A1 - Injection molding of colored components mixes at least two pigments with the granules, with measurement of the colored moldings to correct the pigment dosages - Google Patents

Injection molding of colored components mixes at least two pigments with the granules, with measurement of the colored moldings to correct the pigment dosages Download PDF

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Publication number
DE102006052040A1
DE102006052040A1 DE102006052040A DE102006052040A DE102006052040A1 DE 102006052040 A1 DE102006052040 A1 DE 102006052040A1 DE 102006052040 A DE102006052040 A DE 102006052040A DE 102006052040 A DE102006052040 A DE 102006052040A DE 102006052040 A1 DE102006052040 A1 DE 102006052040A1
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mixing system
injection molding
color
components
colored
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Christian Nitschke
Christoph Dr. Jaroschek
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/34—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
    • B29B7/38—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary
    • B29B7/40—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with single shaft
    • B29B7/42—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with single shaft with screw or helix
    • 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
    • B01F23/50—Mixing liquids with solids
    • B01F23/53—Mixing liquids with solids using driven stirrers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
    • B01F27/70—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with paddles, blades or arms
    • 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
    • B01F35/213—Measuring of the properties of the mixtures, e.g. temperature, density or colour
    • 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
    • B01F35/221—Control or regulation of operational parameters, e.g. level of material in the mixer, temperature or pressure
    • B01F35/2211—Amount of delivered fluid during a period
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/58—Component parts, details or accessories; Auxiliary operations
    • B29B7/60—Component parts, details or accessories; Auxiliary operations for feeding, e.g. end guides for the incoming material
    • B29B7/603—Component parts, details or accessories; Auxiliary operations for feeding, e.g. end guides for the incoming material in measured doses, e.g. proportioning of several materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/80—Component parts, details or accessories; Auxiliary operations
    • B29B7/88—Adding charges, i.e. additives
    • B29B7/94—Liquid charges
    • 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
    • B29C45/18—Feeding the material into the injection moulding apparatus, i.e. feeding the non-plastified material into the injection unit
    • B29C45/1816—Feeding auxiliary material, e.g. colouring 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
    • 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
    • B29C2945/76153—Optical properties
    • 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
    • B29C2945/7629—Moulded articles
    • 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
    • B29C2945/76461—Optical, e.g. laser
    • 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
    • B29C2945/76655—Location of control
    • B29C2945/76792—Auxiliary devices
    • B29C2945/76809—Auxiliary devices raw material feeding devices
    • 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
    • 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
    • B29C48/285—Feeding the extrusion material to the extruder
    • B29C48/286—Raw material dosing
    • 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
    • B29C48/285—Feeding the extrusion material to the extruder
    • B29C48/29—Feeding the extrusion material to the extruder in liquid form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/0005—Condition, form or state of moulded material or of the material to be shaped containing compounding ingredients
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/0005—Condition, form or state of moulded material or of the material to be shaped containing compounding ingredients
    • B29K2105/0032—Pigments, colouring agents or opacifiyng agents

Abstract

The mixing system for at least two colors (1,2) with at least one raw polymer material, for injection molding of colored moldings, adds them directly to the polymer before or during or after melting. The composition of the components is computed according to the relative spectral remission distribution to give the plastics a defined color value for injection molding. The color of the molding is measured (23) for the actual value to be compared with a nominal value by an algorithm integrated in the control unit (24) to set the color pigment dosing pumps (3,4).

Description

Die Erfindung betrifft ein Mischsystem zur Direkt-Einfärbung von Kunststoff-Spritzgussartikeln mit mehr als einem Farbmittel unter Berücksichtigung der Eigenfarbe des eingesetzten Farbwerts des verwendeten Polymerrohstoffs.The The invention relates to a mixing system for direct coloring of Plastic injection articles with more than one colorant taking into account the inherent color the color value used of the polymer raw material used.

Stand der TechnikState of the art

Es ist bekannt Kunststoffteile während der Produktion mit einer Spritzgießmaschine mit Farbmitteln einzufärben. Hierbei verwendet man üblicherweise mit definierten Farbwerten vorkonfigurierte Farbmittel.It is known plastic parts during to color the production with an injection molding machine with colorants. in this connection one usually uses preconfigured colorants with defined color values.

Aus DE 35 05 036 ist zudem bekannt, dass der zu färbende Polymerrohstoff mittels Extruder und einer Anzahl von Einzelfarbmitteln vor dem eigentlichen Spritzgießvorgang gefärbt wird. Hierbei ist das Problem noch nicht gelöst, dass der Spritzgießvorgang wegen des wiederholten Aufschmelzvorgangs und der damit einhergehenden Temperaturbelastung einen wesentlichen Einfluss auf den endgültigen Farbwert hat. Ein weiteres Problem ist, dass die Zusammensetzung der Komponenten für die zu erzielenden Farbwerte mindestens näherungsweise bekannt sein muss.Out DE 35 05 036 It is also known that the polymer raw material to be dyed is dyed by means of extruders and a number of individual colorants before the actual injection molding process. Here, the problem is not yet solved that the injection molding process has a significant influence on the final color value due to the repeated melting process and the associated temperature stress. Another problem is that the composition of the components must be at least approximately known for the color values to be achieved.

Aus DE 694 221 990 ist zusätzlich bekannt, dass die Farbmittelzusammensetzung nach der Theorie von Kubelka und Munk ermittelt wird. Dabei wird aber das reale Verhalten der Pigmente, nämlich dessen Streuverhaltens, in keiner Weise berücksichtigt, weshalb diese Vorgehensweise zur Herstellung von transparenten Bauteilen mit definierten Farbwerten nicht einsetzbar ist ( Farbenphysik für industrielle Anwendungen, G. Klein; Springer Verlag 2004 ).Out DE 694 221 990 In addition, it is known that the colorant composition is determined according to the theory of Kubelka and Munk. However, the real behavior of the pigments, namely their scattering behavior, is in no way taken into account, which is why this procedure can not be used to produce transparent components with defined color values ( Color physics for industrial applications, G. Klein; Springer publishing house 2004 ).

Aufgabe der ErfindungObject of the invention

Der im Patentanspruch 1 angegebenen Erfindung liegt das Problem zugrunde, dass ein erneuter Aufschmelzvorgang mit nachfolgendem Einfluss auf die Farbwerte vermieden wird. Außerdem soll die Zusammensetzung der Farbmittel ohne Vorkenntnisse ermittelt werden unter Berücksichtigung der jeweiligen Eigenfarbe des verwendeten Polymerrohstoffes. Bei einem Materialwechsel während der Produktion von Kunststoffteilen soll der Farbwert der Erzeugnisse unabhängig vom Farbwert des eingesetzten Polymermaterials und dessen Transparenz sein.Of the The invention defined in claim 1 is based on the problem that a re-melting process with subsequent influence on the color values is avoided. In addition, the composition should the colorant are determined without prior knowledge under consideration the respective inherent color of the polymer raw material used. at a material change during The production of plastic parts should be the color value of the products independently the color value of the polymer material used and its transparency be.

Das Problem wird durch die im Patentanspruch 1 aufgeführten Merkmale gelöst, indem die Zusammensetzung zu mischenden Komponenten auf der Basis der relativen spektralen Remissionsverteilung der Einzelkomponenten ermittelt und die Einzelkomponenten entsprechend direkt dem Spritzgießprozess zugegeben werden. Die speziellen Probleme eines zyklisch arbeitenden Spritzgießvorgangs mit unterschiedlichen Polymerwerkstoffen und damit auch unterschiedlichen Farbwerten des zu färbenden Polymerwerkstoffs werden mit den Merkmalen des Patentanspruchs 2 gelöst, indem das Mischsystem mit einem Farbmessgerät ausgerüstet ist, der einen Vergleich der erzielten Farbe mit dem definierten Farbwert und nachfolgend einer Korrektur der Zusammensetzung ermöglicht.The Problem is solved by the features listed in claim 1 solved, by mixing the composition based on components the relative spectral remission distribution of the individual components determined and the individual components according to the injection molding process be added. The special problems of a cyclic working injection molding with different polymer materials and thus also different ones Color values of the to be colored Polymer material are with the features of claim 2 solved, by the mixing system is equipped with a colorimeter, which makes a comparison the color obtained with the defined color value and below a correction of the composition allows.

Beispielexample

Die Vorteile und vorteilhafte Ausgestaltung der Erfindung sind der nachfolgenden Beschreibung, der Zeichnung und den Ansprüchen entnehmbar. Die Zeichnung gibt eine besonders bevorzugte Ausführungsform der Erfindung wieder.The Advantages and advantageous embodiment of the invention are the following Description, the drawings and claims removed. The drawing represents a particularly preferred embodiment of the invention.

Dabei zeigenthere demonstrate

1 eine Gesamtdarstellung der Mischanlage als Zusatz zu einer Spritzgießmaschine 1 an overall view of the mixing plant as an addition to an injection molding machine

2 eine schematische Vorgehensweise der Ermittelung der Zusammensetzung von Farbmitteln auf Basis der gemessenen relativen spektralen Remissionsverteilung der einzusetzenden Komponenten. 2 a schematic approach of determining the composition of colorants on the basis of the measured relative spectral remission distribution of the components to be used.

Die einzelnen Farbmittel (1 und 2) werden mit je einer Dosierpumpe (3 und 4) der volumetrischen oder gravimetrischen Dosiereinheit (5) aus den Farbvorratsbehältern (6 und 7) über die Schläuche (8 und 9) in den Granulateinzug (10) der Spritzgießeinheit (11) bestehend aus Plastifizierschnecke (15) und Zylinder (17) dem Kunststoffgranulat (12), welches aus dem Vorratsbehälter (13) entnommen wird, in einem errechneten Mischungsverhältnis zugegeben. Zur Verbesserung der Farbhomogenität kann unterhalb oder in unmittelbarer Nähe der Farbmittelzuführung ein optionales Mischelement (14) montiert werden. Das Kunststoffgranulat (12) wird mit den zudosierten Farbmitteln (1 und 2) von der Plastifizierschnecke (15) durch Rotation dieser eingezogen und zwischen Schneckengängen (16) und dem beheizten Zylinder (17) aufgeschmolzen und homogenisiert und an das vordere Ende der Plastifizierschnecke gefördert. Die Kunststoffschmelze (18) wird dann durch eine Hubbewegung der Plastifizierschnecke (15) in die Negativform (19) eingespritzt, während die beiden Werkzeughälften (20 und 21), zwischen den beiden Aufspannplatten (20a und 21a), geschlossen sind. Nachdem die Kunststoffschmelze (18) in der Negativform (19) durch Kühlung ausreichend erstarrt ist, kann das Formteil (22) nach dem Öffnen der beiden Werkzeughälften (20 und 21) entnommen werden. Durch eine geeignete Farbmesseinheit (23) kann der Farbwert des entnommenen Formteils (22) gemessen werden. Der Istwert der Farbe kann mit dem angestrebten Sollwert verglichen werden. Durch geeignete Algorhythmen, die in der Regelung (24) integriert sind, kann ein korrigiertes Mischungsverhältnis errechnet werden, falls der Ist-Wert vom Soll-Wert abweicht. Die Menge der von den Dosierpumpen (3 und 4) zu dosierenden Farbmittel (1 und 2) werden dem Sollwert entsprechend angepasst.The individual colorants ( 1 and 2 ) are each equipped with a dosing pump ( 3 and 4 ) of the volumetric or gravimetric dosing unit ( 5 ) from the paint reservoirs ( 6 and 7 ) over the hoses ( 8th and 9 ) in the granulated ( 10 ) of the injection molding unit ( 11 ) consisting of plasticizing screw ( 15 ) and cylinders ( 17 ) the plastic granules ( 12 ), which from the reservoir ( 13 ) is added in a calculated mixing ratio. To improve the color homogeneity, an optional mixing element (below or in the immediate vicinity of the colorant feed) may be used ( 14 ) to be assembled. The plastic granulate ( 12 ) is mixed with the added colorants ( 1 and 2 ) from the plasticizing screw ( 15 ) retracted by rotation of these and between flights ( 16 ) and the heated cylinder ( 17 ) are melted and homogenized and conveyed to the front end of the plasticizing screw. The plastic melt ( 18 ) is then replaced by a lifting movement of the plasticizing screw ( 15 ) in the negative form ( 19 ), while the two tool halves ( 20 and 21 ), between the two platens ( 20a and 21a ) are closed. After the plastic melt ( 18 ) in the negative form ( 19 ) is sufficiently solidified by cooling, the molded part ( 22 ) after opening the two mold halves ( 20 and 21 ). Through a suitable color measuring unit ( 23 ), the color value of the removed molding ( 22 ) are measured. The actual value of the color can be compared with the target value be. Through suitable algorithms, which are included in the scheme ( 24 ), a corrected mixing ratio can be calculated if the actual value deviates from the nominal value. The amount of dosing pumps ( 3 and 4 ) to be metered colorant ( 1 and 2 ) are adjusted according to the setpoint.

Zur Ermittelung der Zusammensetzung der Farbmittel werden die Remissionskurven der Einzelkomponenten zusammengeführt. Hierfür wird jeweils die Intensität (25) der Farbe über der Wellenlänge (26) aufgetragen. In 2 sind beispielhaft die Farben weiß (27) und schwarz (31) sowie die des ungefärbten Polymerrohstoffs (29) und der eingesetzten Farben gelb (28) und blau (30) im oberen Diagramm eingetragen. Im unteren Diagramm ist die gewünschte Ziel-Farbe grün (33) dargestellt. Die Zielfarbe ergibt sich aus einer Aufsummierung der Einzelfarben an einer Auswahl von Wellenlängen, dargestellt jeweils als Schnittpunkt der Remissionskurven mit den Schnittpunkten der jeweiligen Wellenlängen (34). Damit ergibt sich die Zielfarbe (32)To determine the composition of the colorants, the remission curves of the individual components are combined. For this purpose, the intensity ( 25 ) of the color over the wavelength ( 26 ) applied. In 2 are the colors white ( 27 ) and black ( 31 ) as well as the undyed polymer raw material ( 29 ) and the colors used yellow ( 28 ) and blue ( 30 ) in the upper diagram. In the lower diagram, the desired target color is green ( 33 ). The target color results from a summation of the individual colors at a selection of wavelengths, shown in each case as an intersection of the remission curves with the intersections of the respective wavelengths ( 34 ). This results in the target color ( 32 )

Die Korrektur des Mischungsverhältnis wird solange durchgeführt bis der Sollwert erreicht ist. Nach Erreichen des Sollwertes kann die Produktion der Formteile (22) mit den gewünschten Farbwerten unverzüglich aufgenommen werden.The correction of the mixing ratio is carried out until the setpoint is reached. After reaching the setpoint, the production of the molded parts ( 22 ) with the desired color values without delay.

Claims (3)

Mischsystem zum gezielten Mischen von mindestens zwei unterschiedlichen Farbmitteln mit mindestens einem thermoplastischen Polymerrohstoff zur Einfärbung von Kunststoff-Spritzgußteilen mit einem definierten Farbwert, zum Einsatz an einer Spritzgießmaschine während des Produktionsablaufs, wobei die Farbmittel vor, während oder nach dem Aufschmelzvorgang direkt dem Polymerrohstoff zugegeben werden dadurch gekennzeichnet, dass das Mischsystem die Zusammensetzung der zu mischenden Komponenten auf Basis der relativen spektralen Remissionsverteilung der zur Verfügung stehenden Komponenten berechnet werden, um einen definierten Farbwert der herzustellenden Kunststoffteile zu erzielen und die benötigten Komponenten entsprechend der Berechnung dem Spritzgießprozess zuführt.Mixing system for selectively mixing at least two different colorants with at least one thermoplastic polymer raw material for the coloring of plastics injection-molded parts with a defined color value, for use on an injection molding machine during the production process, the colorant prior to, during, or added after the melting process directly to the polymer raw material characterized in that the mixing system calculates the composition of the components to be mixed on the basis of the relative spectral remission distribution of the available components in order to achieve a defined color value of the plastic parts to be produced and supplies the required components to the injection molding process in accordance with the calculation. Mischsystem nach Patentanspruch 1, dadurch gekennzeichnet, dass das Mischsystem über ein Farbmessgerät, bzw. Farberkennungssystem, verfügt das die Farbwerte der hergestellten Formteile erfasst und anhand von Abweichungen der Ist-Farbwerte von dem Soll-Farbwert, z.B. aufgrund thermischer Belastung, unterschiedlicher Polymerrohstoffe oder unterschiedlicher Materialchargen der verwendeten Komponenten, die Farbmittelzufuhr automatisch korrigiert.Mixing system according to claim 1, characterized in that that the mixing system over a colorimeter, or color recognition system which captures the color values of the molded parts produced and based on deviations of the actual color values from the target color value, e.g. due to thermal stress, different Polymer raw materials or different batches of material used Components that automatically correct colorant supply. Mischsystem nach Patenanspruch 1, dadurch gekennzeichnet, dass das Mischsystem aus einer Parallelanordnung von mindestens zwei gleichen oder unterschiedlichen Dosierpumpen, z.B. Schlauch-, Exzenterschnecken-, Kolben- oder Zahnradpumpen, besteht, die unabhängig voneinander angesteuert werden können.Mixing system according to claim 1, characterized that the mixing system consists of a parallel arrangement of at least two equal or different metering pumps, e.g. Tube-, Eccentric screw, piston or gear pumps, which are controlled independently can be.
DE102006052040A 2006-10-30 2006-10-30 Injection molding of colored components mixes at least two pigments with the granules, with measurement of the colored moldings to correct the pigment dosages Withdrawn DE102006052040A1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012016715A2 (en) 2010-08-06 2012-02-09 Sumitomo (Shi) Demag Plastics Machinery Gmbh Plasticiser unit for an injection moulding machine, an extruder or the like and liquid feed device provided therefor
CN111421784A (en) * 2020-03-30 2020-07-17 包志国 Plastics production facility with reinforced function of ration
CN112440558A (en) * 2019-08-28 2021-03-05 徐州荔枝文化传媒有限公司 A air brushing device for air brushing advertisement

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012016715A2 (en) 2010-08-06 2012-02-09 Sumitomo (Shi) Demag Plastics Machinery Gmbh Plasticiser unit for an injection moulding machine, an extruder or the like and liquid feed device provided therefor
DE102010039025A1 (en) 2010-08-06 2012-02-09 Sumitomo (Shi) Demag Plastics Machinery Gmbh Plasticizing unit for an injection molding machine, an extruder and the like and provided for liquid supply device
CN112440558A (en) * 2019-08-28 2021-03-05 徐州荔枝文化传媒有限公司 A air brushing device for air brushing advertisement
CN111421784A (en) * 2020-03-30 2020-07-17 包志国 Plastics production facility with reinforced function of ration

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