CA2643213A1 - Process for the coloring of plastics with liquid colorant and liquid colorant container suitable for this purpose - Google Patents

Process for the coloring of plastics with liquid colorant and liquid colorant container suitable for this purpose Download PDF

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Publication number
CA2643213A1
CA2643213A1 CA002643213A CA2643213A CA2643213A1 CA 2643213 A1 CA2643213 A1 CA 2643213A1 CA 002643213 A CA002643213 A CA 002643213A CA 2643213 A CA2643213 A CA 2643213A CA 2643213 A1 CA2643213 A1 CA 2643213A1
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CA
Canada
Prior art keywords
container
liquid colorant
machine
data
memory element
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.)
Abandoned
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CA002643213A
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French (fr)
Inventor
Maurice Weelen
Martin Welp
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Evonik Operations GmbH
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Individual
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Filing date
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Publication of CA2643213A1 publication Critical patent/CA2643213A1/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • 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
    • B29C45/16—Making multilayered or multicoloured articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/80—Mixing plants; Combinations of mixers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/80—Mixing plants; Combinations of mixers
    • B01F33/84—Mixing plants with mixing receptacles receiving material dispensed from several component receptacles, e.g. paint tins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/80—Mixing plants; Combinations of mixers
    • B01F33/84—Mixing plants with mixing receptacles receiving material dispensed from several component receptacles, e.g. paint tins
    • B01F33/844—Mixing plants with mixing receptacles receiving material dispensed from several component receptacles, e.g. paint tins with means for customizing the mixture on the point of sale, e.g. by sensing, receiving or analysing information about the characteristics of the mixture to be made
    • B01F33/8442—Mixing plants with mixing receptacles receiving material dispensed from several component receptacles, e.g. paint tins with means for customizing the mixture on the point of sale, e.g. by sensing, receiving or analysing information about the characteristics of the mixture to be made using a computer for controlling information and converting it in a formula and a set of operation instructions, e.g. on the point of sale
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/80—Mixing plants; Combinations of mixers
    • B01F33/84—Mixing plants with mixing receptacles receiving material dispensed from several component receptacles, e.g. paint tins
    • B01F33/848—Mixing plants with mixing receptacles receiving material dispensed from several component receptacles, e.g. paint tins using data, i.e. barcodes, 3D codes or similar type of tagging information, as instruction or identification codes for controlling the dispensing and mixing operations
    • 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
    • B01F35/2209—Controlling the mixing process as a whole, i.e. involving a complete monitoring and controlling of the mixing process during the whole mixing cycle
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/92—Measuring, controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44D—PAINTING OR ARTISTIC DRAWING, NOT OTHERWISE PROVIDED FOR; PRESERVING PAINTINGS; SURFACE TREATMENT TO OBTAIN SPECIAL ARTISTIC SURFACE EFFECTS OR FINISHES
    • B44D3/00—Accessories or implements for use in connection with painting or artistic drawing, not otherwise provided for; Methods or devices for colour determination, selection, or synthesis, e.g. use of colour tables
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44D—PAINTING OR ARTISTIC DRAWING, NOT OTHERWISE PROVIDED FOR; PRESERVING PAINTINGS; SURFACE TREATMENT TO OBTAIN SPECIAL ARTISTIC SURFACE EFFECTS OR FINISHES
    • B44D3/00—Accessories or implements for use in connection with painting or artistic drawing, not otherwise provided for; Methods or devices for colour determination, selection, or synthesis, e.g. use of colour tables
    • B44D3/12—Paint cans; Brush holders; Containers for storing residual paint
    • 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
    • B29C2945/76494—Controlled parameter
    • B29C2945/76545—Flow rate
    • 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
    • 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
    • B29C2945/76829—Feeding
    • B29C2945/76832—Feeding raw materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/9258—Velocity
    • B29C2948/926—Flow or feed rate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92828—Raw material handling or dosing, e.g. active hopper or feeding device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92857—Extrusion unit
    • B29C2948/92866—Inlet shaft or slot, e.g. passive hopper; Injector, e.g. injector nozzle on barrel
    • 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
    • B29C48/288—Feeding the extrusion material to the extruder in solid form, e.g. powder or granules
    • 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

Abstract

Plastics are coloured by feeding liquid colour into a continuously operated extruder or an intermittent injection-moulding machine from feed equipment for liquid colour, connected to a container for liquid colour, using a container which comprises a machine-readable memory element in which data concerning properties of the liquid colour present in the container have been stored, and where the feed equipment reads off, from the machine-readable memory element of the container, data concerning properties of the liquid colour present in the container, and uses the data read off to control or adjust the amount of liquid colour fed.

Description

Process for the coloring of plastics with liquid colorant and liquid colorant container suitable for this purpose The invention relates to a process for the coloring of plastics in a continuously operated extruder or an intermittently operating injection-molding machine, and to a liquid colorant container suitable for the process, which can be used to achieve consistent and reproducible coloring of plastics, even with a liquid colorant that has not been precisely standardized.

The feeding of liquid colorant into a continuously operated extruder or an intermittently operating injection-molding machine is a simple method of coloring plastics during their processing. Use of liquid colorant in this way can avoid maintaining inventory of colored plastics.

In order to achieve consistent and reproducible results when coloring with liquid colorant, the usual method uses liquid colorants with standardized properties and meters the liquid colorants for production of a certain color in each case with constant weight or volume. However, standardization of the properties of a liquid colorant requires additional operations and is particularly difficult in the case of liquid colorants which are metered not only by weight but also by volume, and for which it is therefore not only the color strength that has to be standardized but also the density of the liquid colorant.
WO 02/087849 discloses a process in which one or more liquid colorants are introduced into a continuously operated plastics-processing machine, where the metering of the liquid colorant takes place with a metering device according to fixedly prescribed formulations.

DE 197 28 733 Al discloses a process in which liquid colorant is metered into the conveying path of the injection material, leading to the mold cavities, in an intermittently operating injection-molding machine.
Prescribed amounts of liquid colorant are metered here.

In both of the known processes, differences in the substance properties of the liquid colorant which have an effect on its color strength inevitably lead to deviations in the coloring of the plastic.

DE 35 05 036 Al discloses a process for the controlled addition of colorant concentrates into a screw-based machine, where a spectrometer attached to the screw-based machine is used to measure the color intensity of the colored mixture, and the measured signal is used to control the addition of solid colorant concentrates to the screw-based machine. The process achieves uniform coloring in the event of variations in the color strength of the colorant concentrates, but requires modification of the machine with an expensive spectrometer.

EP 131 414 describes a method for the production of color mixtures by using a metering device to meter dye from a container which comprises a memory element in which information relating to the color properties of the dye is stored. In this method, the metering device reacts to information stored in the memory element in order to meter an amount of dye required to achieve the prescribed color.
EP 131 414 contains no reference to coloring of plastics.
There continues to be a need for a process which uses liquid colorant for the coloring of plastics and which dependably achieves a consistent and reproducible result during the coloring process, even when using a liquid colorant which has not been precisely standardized.

It has now been found that this object can be achieved by a process in which liquid colorant is metered from a container which has a machine-readable memory element in which data relating to substance properties of the liquid colorant present in the container are stored, where the metering device reads from the memory element of this container data relating to substance properties of the liquid colorant and uses the read data to adjust or control the amount of liquid colorant metered.

The invention provides a process for the coloring of plastics by metering of liquid colorant from a liquid colorant metering device, connected to least one liquid colorant container, into a continuously operated extruder or an intermittently operating injection-molding machine, characterized in that at least one container is used which comprises at least one machine-readable memory element in which data on substance properties of the liquid colorant present in the container are stored, and the metering device reads from the machine-readable memory element of the container at least a portion of the data on substance properties of the liquid colorant present in the container, and adjusts or controls the amount of liquid colorant metered with the read data.

The invention also provides a liquid colorant container comprising at least one machine-readable memory element in which data on substance properties of the liquid colorant present in the container are stored, wherein data on the density of the liquid colorant are stored in the machine-readable memory element.

The process of the invention uses a liquid colorant container which comprises at least one machine-readable memory element. For the purposes of the invention, machine-readable memory elements are those from which a data-processing system can read data directly. Printed barcodes are an example of machine-readable memory elements from which a data-processing system can read data directly and optically, whereas printed text is not a machine-readable memory element for the purposes of the invention, since the data present in the text cannot be directly read into a machine.

Machine-readable memory elements preferably used are barcodes, magnetic strips, electrically contacted memory elements, and memory elements readable via radio frequency.
The machine-readable memory elements used can be memory elements that are only readable, examples being barcodes or ROM memory elements. Writable memory elements are equally suitable, examples being magnetic strips or EEPROM memory elements. A preferred embodiment uses memory elements readable via radio frequency which are known to the person skilled in the art as RFID tags.

In one embodiment of the invention, the design of the liquid colorant container is such that when the container is connected to a metering device for the liquid colorant, the machine-readable memory element is oriented in a predetermined orientation with respect to the metering device so that the metering device can read data from the memory element.

Data on substance properties of the liquid colorant present in the container are stored in the machine-readable memory element. Preferably, data on one or more of the following properties are stored in the memory element: hue, color strength, lightness, color saturation, hiding power, transparency, and density of the liquid colorant. The data relating to hue, lightness, and color saturation are preferably stored in the form of the parameters L, a, and b, or the parameters L, Cab, and hab of the CIELAB system, or the parameters X, Y, and Z corresponding thereto.
Further data on the liquid colorant present in the container may also be stored in the machine-readable memory element, such as for example the weight of the liquid colorant present in the container, or one or more product identification numbers.

In the process of the invention, at least one liquid colorant container is connected to a liquid colorant metering device. The data on properties of the liquid 5 colorant present in the container are read completely or in part by the metering device and the amount of liquid colorant metered is adjusted or controlled with these data.
The reading of the data can be brought about by the user of the metering device, for example in that the user reads the data with a barcode-reader from a barcode attached to the container and transfers the data from the barcode-reader to the metering device.

In another embodiment, the reading of the data takes place automatically upon connecting the container to the metering device, for example by a coupling between the container and the metering device which electrically contacts the memory element, or by an RFID tag reader integrated into the metering device. It is preferable that with an exchange of a liquid colorant container the metering device automatically reads data from the machine-readable memory element of the container newly connected to the metering device.

Preferably, metering devices in which the metering of the liquid colorant takes place continuously or intermittently at constant flow rates are used in the process of the invention.
In a preferred embodiment of the process of the invention, the metering device reads from the memory element of the container data on the density of the liquid colorant present in the container and adjusts or controls volumetric metering of the liquid colorant with the read data. This embodiment allows consistent and reproducible coloring using liquid colorants, which have been standardized to a constant color strength based on weight, and do not have a precisely standardized density. This embodiment particularly preferably uses commercially available liquid colorant containers which are additionally labeled with a barcode in which the density of the liquid colorant present in the container is stored. This embodiment permits the use of commercially available liquid colorants, standardized to a constant color strength based on weight, with metering devices with volumetric metering of the liquid colorant.

In another preferred embodiment of the process of the invention, the metering device reads from the machine-readable memory element data on the weight of the liquid colorant present in the container and uses the read data to monitor the residual amount of liquid colorant in the co11ta111er. T111s elLlbod'1111e11t 1:a11 rel'lably aVU1d 1A11111te11Ued stoppage of colorant metering when the container has been emptied, even when containers with different filling weight are used. When writable memory elements are used, it is moreover possible to save in the memory element the remaining residual amount of liquid colorant in the container. This permits changeover between only partly filled containers and permits monitoring of the remaining residual amount in the container even when the metering device is connected to a container which is only partly filled and avoidance of unintended emptying of the container during the metering process.

In another preferred embodiment of the process of the invention, the metering device is connected to at least two liquid colorant containers and mixes at least two liquid colorants with one another. Each of the containers connected to the metering device has a machine-readable memory element, in which data on the hue of the liquid colorant present in the container are stored, and the metering device adjusts or controls the mixing ratio of the liquid colorants with the read data.
It is preferable that, in addition to the hue, data on lightness and color saturation in the form of the parameters L, a, and b, or the parameters L, Cab, and hab of the CIELAB system, or the parameters X, Y, and Z
corresponding thereto are stored in the memory element.
Using the read data, and setpoint values for the parameters L, a, and b, or L, Cab, and hab, or the parameters X, Y, and Z corresponding thereto, of the liquid colorant, deposited in the metering device, a correction for the mixing ratio can be calculated in the metering device to obtain a mixed liquid colorant, which achieves a consistent and reproducible coloring even in the event of deviations of the parameters L, a, and b, or L, Cab, and hab or the parameters X, Y, and Z corresponding thereto, from the specified value. The correction can sometimes also require the metering of further liquid colorants which are not required for the formulation with the specified values. The person skilled in the art is aware of suitable methods for the calculation of the correction, for example from G. A.
Klein, Farbenphysik fur industrielle Anwendungen [Color physics for industrial applications], Verlag Springer.
Using this embodiment, it is possible to obtain a mixed liquid colorant which achieves a consistent and reproducible coloring even starting from liquid colorants which have not been precisely standardized. Even when using standardized liquid colorants, this embodiment of the inventive process can achieve an even better reproducibility of the coloring, because deviations from the specified value, which remain even after standardization, can be compensated during the metering process.

The process of the invention can achieve consistent and reproducible coloration of preparations in the form of liquids, pastes, powders, or granules, even when using liquid colorants which have not been precisely standardized.

Claims (12)

What is claimed is:
1. A process for the coloring of plastics by metering of liquid colorant from a liquid colorant metering device, connected to at least one liquid colorant container, into a continuously operated extruder or an intermittently operating injection-molding machine, characterized in that at least one container is used comprising at least one machine-readable memory element in which data on substance properties of the liquid colorant present in the container are stored, and the metering device reads from the machine-readable memory element of the container at least a portion of the data on substance properties of the liquid colorant present in the container and adjusts or controls the amount of liquid colorant metered with the read data.
2. The process of claim 1, characterized in that the data stored in the machine-readable memory element have been selected from data on hue, color strength, lightness, color saturation, hiding power, transparency, and density of the liquid colorant, and combinations thereof.
3. The process of claim 1 or 2, characterized in that data on the density of the liquid colorant present in the container are stored in the machine-readable memory element and the metering device adjusts or controls volumetric metering of the liquid colorant with the read data.
4. The process of one of claims 1 to 3, characterized in that additionally data on the weight of the liquid colorant present in the container are stored in the machine-readable memory element and the metering device monitors the residual amount of liquid colorant in the container with the read data.
5. The process of one of claims 1 to 4, characterized in that the metering device is connected to at least two liquid colorant containers and mixes at least two liquid colorants with one another, and each of the containers has a machine-readable memory element, in which data on the hue of the liquid colorant present in the containers are stored, and the metering device adjusts or controls the mixing ratio of the liquid colorants with the read data.
6. The process of one of claims 1 to 5, characterized in that the machine-readable memory element is selected from the group of barcodes, magnetic strips, electrically contacted memory elements, and memory elements readable via radio frequency.
7. The process of one of claims 1 to 6, characterized in that during a change of a liquid colorant container, the metering device automatically reads data from the machine-readable memory element of the container newly connected to the metering device.
8. A liquid colorant container for the coloring of plastics, comprising at least one machine-readable memory element in which data on substance properties of the liquid colorant present in the container are stored, characterized in that data on the density of the liquid colorant are stored in the machine-readable memory element.
9. The container of claim 8, characterized in that additionally data on hue, color strength, lightness, color saturation, hiding power, and transparency of the liquid colorant, and combinations thereof, are stored in the machine-readable memory element.
10. The container of claim 9, characterized in that for the liquid colorant parameters L, a, and b, or parameters L, C ab, and h ab of the CIELAB system, or the parameters X, Y, and Z corresponding thereto, are stored in the machine-readable memory element.
11. The container of one of claims 8 to 10, characterized in that the machine-readable memory element is selected from the group of barcodes, magnetic strips, electrically contacted memory elements, and memory elements readable via radio frequency.
12. The container of one of claims 8 to 11, characterized in that additional data on the weight of the liquid colorant present in the container are stored in the machine-readable memory element.
CA002643213A 2006-02-21 2007-02-07 Process for the coloring of plastics with liquid colorant and liquid colorant container suitable for this purpose Abandoned CA2643213A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP06110230A EP1820568A1 (en) 2006-02-21 2006-02-21 Container for liquid paint comprising a machine-readable storing medium, and method for metering liquid paint
EP06110230 2006-02-21
PCT/EP2007/051171 WO2007096248A1 (en) 2006-02-21 2007-02-07 Process for colouring plastics by feeding liquid colour from feed equipment, and container for liquid colour comprising at least one machine-readable memory element

Publications (1)

Publication Number Publication Date
CA2643213A1 true CA2643213A1 (en) 2007-08-30

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EP (2) EP1820568A1 (en)
KR (1) KR20080109729A (en)
CN (1) CN101389465A (en)
AU (1) AU2007217689A1 (en)
CA (1) CA2643213A1 (en)
MA (1) MA30280B1 (en)
WO (1) WO2007096248A1 (en)
ZA (1) ZA200807194B (en)

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US10767031B2 (en) 2013-07-17 2020-09-08 Stephen B. Maguire Cottonseed oil based liquid color composition and plastics coloring method using the same
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Also Published As

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EP1820568A1 (en) 2007-08-22
ZA200807194B (en) 2009-08-26
CN101389465A (en) 2009-03-18
EP1986836A1 (en) 2008-11-05
WO2007096248A1 (en) 2007-08-30
MA30280B1 (en) 2009-03-02
AU2007217689A1 (en) 2007-08-30
KR20080109729A (en) 2008-12-17

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