EP0407927B1 - Verfahren zum kontinuierlichen Messen des Farbtons einer farbigen Kunsstoff-Formmasse - Google Patents

Verfahren zum kontinuierlichen Messen des Farbtons einer farbigen Kunsstoff-Formmasse Download PDF

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Publication number
EP0407927B1
EP0407927B1 EP90113038A EP90113038A EP0407927B1 EP 0407927 B1 EP0407927 B1 EP 0407927B1 EP 90113038 A EP90113038 A EP 90113038A EP 90113038 A EP90113038 A EP 90113038A EP 0407927 B1 EP0407927 B1 EP 0407927B1
Authority
EP
European Patent Office
Prior art keywords
plastic
measuring
measurement
molding material
color
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.)
Expired - Lifetime
Application number
EP90113038A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0407927A2 (de
EP0407927A3 (en
Inventor
Detlef Klaus Busch
Horst Grohmann
Harald Kutzner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hoechst AG
Original Assignee
Hoechst AG
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Filing date
Publication date
Application filed by Hoechst AG filed Critical Hoechst AG
Publication of EP0407927A2 publication Critical patent/EP0407927A2/de
Publication of EP0407927A3 publication Critical patent/EP0407927A3/de
Application granted granted Critical
Publication of EP0407927B1 publication Critical patent/EP0407927B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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 of coloring a colored plastic molding composition, in which the color of the molding composition 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.
  • a method for determining the color tone of a lacquer layer by measuring the light reflected from the surface by means of sensors which are sensitive to the colors red, green and blue (cf. EP-A 284 090).
  • a method is also known for making the surface of a fiber sample as flat as possible in order to be able to measure its color under comparable conditions (cf. US Pat. No. 3,224,423).
  • the flow rate through the measuring point should be such that the Reynolds number of the paint color is at least 25 and not more than 2000. This achieves a self-cleaning effect in the cell and prevents the paint from settling.
  • the measurement signals from the colorimeter are converted by a computer into control signals which allow the addition of the paint components to be regulated.
  • the invention thus relates to a method for continuously measuring the color tone 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, the molding compound particles in a dense packing be guided past the measuring window by the measuring device at a minimum speed of 1 cm / sec.
  • the invention also relates to the use of a device consisting of a storage container (61), an adjoining measuring tube (62) into which a measuring window (63) made of glass is inserted, an emptying device (8), one outside the tube (62) the measuring window (63) light source (64) and a sensor group (66) for the colors blue, green and red.
  • a device consisting of a storage container (61), an adjoining measuring tube (62) into which a measuring window (63) made of glass is inserted, an emptying device (8), one outside the tube (62) the measuring window (63) light source (64) and a sensor group (66) for the colors blue, green and red.
  • the invention further relates to the use of this method for producing a colored plastic molding compound, in which at least one Pigment is mixed into the plastic, characterized in that samples are continuously taken from the dry colored molding compound and the measurement signals are converted into control signals for controlling the metering devices for the pigment and the plastic.
  • samples are continuously taken from the stream of dry colored material behind the mixing plant.
  • the molding compound can be obtained by various methods, it is essential that it is dry on the surface and that no condensation can form during the measurement.
  • Sampling can be carried out 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 uniformly and at the same time forms a barrier against vapors or gases which may come from the main stream of the molding compound.
  • a cellular wheel sluice is advantageously used.
  • a light source with an almost constant color temperature for example a halogen lamp, is attached in front of the measuring window. It illuminates the molding compound particles located 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 located itself in tight packing. 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 to 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 into guide values in the computer (10) and applied to the metering control device (11).
  • the control signals determined in the control device (11) are transmitted via lines (12) and (13) to the pelletizing system (1).
  • a measuring device is shown 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 through this measuring window (63) through the optical fiber bundle (67) the surface of the granules (65) being passed.
  • the reflected light is collected by the sensor group (66) and, according to the proportions of the colors green, blue and red, is sent as electrical signals to the computer (10) (not shown).
  • 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.
  • 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 / C 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 a signal spread.
  • the voltage signal is ⁇ ⁇ 100 mV.
  • the guide 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 ... 1V or 0/4 ... 20mA which are common in measuring technology.
  • a constant product quality of the product stream is achieved, which is based on the constant and reproducible measurement values of the color tone measurement on the continuous test stream.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Processes Of Treating Macromolecular Substances (AREA)
  • Spectrometry And Color Measurement (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Mechanical Treatment Of Semiconductor (AREA)
  • Dental Preparations (AREA)
EP90113038A 1989-07-12 1990-07-07 Verfahren zum kontinuierlichen Messen des Farbtons einer farbigen Kunsstoff-Formmasse Expired - Lifetime EP0407927B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3922902A DE3922902A1 (de) 1989-07-12 1989-07-12 Verfahren zur herstellung einer farbigen kunststoff-formmasse
DE3922902 1989-07-12

Publications (3)

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

Family

ID=6384806

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90113038A Expired - Lifetime EP0407927B1 (de) 1989-07-12 1990-07-07 Verfahren zum kontinuierlichen Messen des Farbtons einer farbigen Kunsstoff-Formmasse

Country Status (8)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3126321A1 (fr) * 2021-09-01 2023-03-03 L'Air Liquide Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude Dispositif de melange continu et procede associe

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69421990T9 (de) * 1993-10-04 2011-05-26 Sabic Innovative Plastics Ip B.V. System für die Kontrolle der Farbe gemischter Polymere mittels kontinuierlicher Farbemessung
DE19626785A1 (de) * 1996-07-03 1998-01-08 Basf Ag Verfahren und Vorrichtung zur kontinuierlichen Farbmessung von Kunststoff-Formmassen
BR9801134A (pt) 1998-03-26 2006-11-14 Renner Herrmann Sa aparelho e processo para preparação contìnua de um fluido com ajuste automático das suas propriedades
US6469789B1 (en) 2000-08-22 2002-10-22 General Electric Company On-line color measurement system for cooled product
DE10219034B4 (de) * 2002-04-29 2004-04-08 Bayer Ag Verfahren und Vorrichtung zur Bestimmung der Farbe von Kunststoffgranulat
WO2009040291A1 (de) * 2007-09-21 2009-04-02 Basf Se Verfahren und vorrichtung zur messung von farbeigenschaften von kunststoffgranulaten
DE102008013170A1 (de) * 2008-03-07 2009-09-10 Wobben, Aloys Verfahren zum Einstellen eines Mischungsverhältnisses von zwei oder mehr Komponenten
DE102011113543A1 (de) * 2011-09-15 2013-03-21 Klöckner Pentaplast GmbH & Co. KG Gefärbte polymere Formkörper, Verfahren und Vorrichtung zur Herstellung der Formkörper
DK3843966T3 (da) * 2018-08-29 2023-01-09 Erema Eng Recycling Maschinen & Anlagen Gmbh Fremgangsmåde og indretning til forarbejdning, bearbejdning og/eller recycling af termoplastiske plastmaterialer
JP2022526326A (ja) * 2019-03-26 2022-05-24 コベストロ・インテレクチュアル・プロパティ・ゲゼルシャフト・ミット・ベシュレンクテル・ハフツング・アンド・コー・カーゲー 透明バルク材料の色値を決定する方法
DE102019217090A1 (de) * 2019-11-06 2021-05-06 LIEB TGA GmbH Mischvorrichtung, Gussvorrichtung und Verfahren zum Betreiben einer Mischvorrichtung
CN113546552A (zh) * 2021-07-27 2021-10-26 北京住总集团有限责任公司 一种泥浆搅拌装置
FR3127281B1 (fr) * 2021-09-23 2023-08-25 Exel Ind Dispositif de mesure de teinte pour un système de distribution de fluide
CN115382461B (zh) * 2022-10-31 2023-05-12 东营市宝泽能源科技有限公司 一种具有配比调节功能的铁离子稳定剂生产装置及方法

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Publication number Priority date Publication date Assignee Title
US3224324A (en) * 1962-09-27 1965-12-21 Monsanto Co Method of presentation of compressionable fibrous samples
DE2133797A1 (de) * 1971-07-07 1973-01-25 Hoechst Ag Messung von verfaerbungen an einer stroemenden polymerschmelze
JPS5830641A (ja) * 1981-08-18 1983-02-23 Satake Eng Co Ltd 連続穀粒精白度測定装置
US4403866A (en) * 1982-05-07 1983-09-13 E. I. Du Pont De Nemours And Company Process for making paints
US4799799A (en) * 1985-02-06 1989-01-24 The United States Of America As Represented By The Secretary Of The Interior Determining inert content in coal dust/rock dust mixture
DE3505036C2 (de) * 1985-02-14 1987-02-26 Werner & Pfleiderer, 7000 Stuttgart Vorrichtung zur gesteuerten Zugabe von Farbkonzentraten in eine Schneckenmaschine
JP2567601B2 (ja) * 1987-03-27 1996-12-25 サンスター技研 株式会社 塗布剤の塗布状態検査方法
DE3731804A1 (de) * 1987-09-22 1989-03-30 Agfa Gevaert Ag Anordnung zur bestimmung des dispersionsgrades magnetischer pigmente in einer dispersion

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3126321A1 (fr) * 2021-09-01 2023-03-03 L'Air Liquide Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude Dispositif de melange continu et procede associe
WO2023031564A1 (fr) * 2021-09-01 2023-03-09 L'Air Liquide Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude Dispositif de melange continu et procede associe

Also Published As

Publication number Publication date
DE59006110D1 (de) 1994-07-21
EP0407927A2 (de) 1991-01-16
ES2056308T3 (es) 1994-10-01
ATE107190T1 (de) 1994-07-15
CA2020947A1 (en) 1991-01-13
AU5887090A (en) 1991-01-17
EP0407927A3 (en) 1992-07-22
DE3922902A1 (de) 1991-01-17
AU644086B2 (en) 1993-12-02
ZA905423B (en) 1991-04-24
JPH0345304A (ja) 1991-02-26

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