CA2020947A1 - Process for the preparation of a colored plastic molding material - Google Patents
Process for the preparation of a colored plastic molding materialInfo
- Publication number
- CA2020947A1 CA2020947A1 CA002020947A CA2020947A CA2020947A1 CA 2020947 A1 CA2020947 A1 CA 2020947A1 CA 002020947 A CA002020947 A CA 002020947A CA 2020947 A CA2020947 A CA 2020947A CA 2020947 A1 CA2020947 A1 CA 2020947A1
- Authority
- CA
- Canada
- Prior art keywords
- molding material
- granules
- plastic
- monitoring
- colored
- 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
Links
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
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)
- Dental Preparations (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
- Mechanical Treatment Of Semiconductor (AREA)
Abstract
ABSTRACT
Process for the preparation of a colored plastic molding material The present process is used to continuously monitor the color of the molding material and the test signals are indirectly used to control the mixing ratio of plastic and color pigment. For this purpose, samples are taken continuously from the material flow downstream of the mixer and this close-packed material is fed through the monitoring apparatus past the measuring window. Through the measuring window, the surface of the molding material particles is illuminatec and the reflected light is captured by sensors which allow monitoring of the colors green, blue and red. A computer is used to process the test signals into control signals for the metering apparatus in the mixer.
The process is particularly suitable for preparing colored plastic granules.
Process for the preparation of a colored plastic molding material The present process is used to continuously monitor the color of the molding material and the test signals are indirectly used to control the mixing ratio of plastic and color pigment. For this purpose, samples are taken continuously from the material flow downstream of the mixer and this close-packed material is fed through the monitoring apparatus past the measuring window. Through the measuring window, the surface of the molding material particles is illuminatec and the reflected light is captured by sensors which allow monitoring of the colors green, blue and red. A computer is used to process the test signals into control signals for the metering apparatus in the mixer.
The process is particularly suitable for preparing colored plastic granules.
Description
2~2~
~OECHST ARTIENGESELhSCHAET ~OE 89/F 224 Dr.DA/sch Description Proce~s for the preparation of a colored plastic molding m~terial S The invention relates to a process for the preparation of a colored plastic molding material, in which the color of the molding material is continuously monitored and the test signals are used indire~tly ~o control the mixing ratio of plastic and color pigment.
In the known process for the preparation of colored plastic granules, a mixture of polymer and pigment, the latter usually in concentrate form, and optionally auxiliaries, is introduced into a granulator and pro-ces~ed into granul~. Sample~ of these granules are taken and molded into test piece~, the shade of which is assessed ~isual~y or colorimetrically. If appropriate, the mixing ratio of polymer to pigment is then chanyed.
Change~ are made to this ratio until the shade of the granules coincides with the ~pecified shade.
Owing ko the time con~umed in preparing and assessing the test pieces, discrepancies such as those which are caused, for example, by differences between ~he batches of pigment, can only be detected after a lengthy period.
A~ a consequence, the proportion of sub~tandaxd product can amount to ~everal percent. In particular, ~he produc-tion of end product~ for wh~ch individ~lal compone~ts of identical shade are ~ade from granule~ from differe~t production run~ or di~ferent production unit~, requires continuou~ tracking of the ~hade during polymer pigm~nta-: 30 tion to e~sure that the varian~ of ac~ual shade from ~he control approa~he~ zero. ~o achieve thi4, the batches of granules mu~t be homogenized ln a costly additional prscP~s ~tep.
~ 2 --The object is therefore to determine the shade of pla~tic molding material~, in particular plastic granule~, continuously during their production and to use the results as rapidly as possible to control the metering of polymer and pi~ment.
It has been found that a continuous monitoring of the ~hade of the molding material is possible if the molding material particles are fed past the monitoring apparatus in a suitable manner.
The presen~ invention accordingly provides a proces~ for the preparation of a colored plastic molding material by ~dmixing at least one pigment with ~he plastic~ which comprises continuously removing samples from the dry colored molding material and feeding the~e past a light lS source, the colors green, blue and red of the light reflected from the surface of the molding material particles being monitored and the test signal~ being converted into control signal~ for controlling th~
metering apparatus for the pi~ment and the pla8~ic .
Furthermore, the invention provides a process for the continuous monitoring of the shade of a colored pl~ BtiC
molding material by illuminating the ~urface of the molding material particle~ by means of a light source and monitoring the color~ green, blus and red in the light reflected fr~ the ~ur~ace of the moldin~ material particle~, wherein the clo~e-packed molding ma~erial particle~ ara fed through tha monitoring apparatus past the mea~uring window.
Finally~ ~he invention provide~ the appara~us for the c~n~inuou~ moni~oring of the shade of a colored plastic molding material, this apparatus compri~ing a feed hopper (61), a gr~duated t~be (62) connected ther~to in which a glazs mea~uri~g window (63) ha~ been ~et, a light source (h4) out~ide the tuba (62) and in front of the measuring window (63), and ~ ~en~or b~nk (663. Light source ~643 2~a9~rl and sensor bank (66) can be arranged next to ~ach other.
PrefQrably they are combined by using an optical fiber bundle (67) to in~roduce li~ht and to lead off the reflected light. In this case, light source (64~ and sensor bank (66) are lvcated in a separate housing.
In the process according to the invention, samples are ~aken continuously from the stream of dry colored material downstream of the m:ixer. The molding material can have been obtained by various processes, the es~en-tial points being that it must be dry on the surface andthat no water condensation can form during monitoring.
Sampl~s can be taken compl~tely continuou~ly by diverting a small portion of the material flow, or else they ~an be taken continuously at tLme intervals. Preferably s~mples are taken from the material flow at regular time in~er-vals, for example by suction. The samples of material are passed from the sampling device to the ~eed hopper of the monitoring apparatus.
The monitoring apparatus consi~ts of a tube of round or square cros~ section in whose wall a window sealed with a glass plate has been fitted. At one end, the tube has the form o~ a feed hopper and at the other end it i~ con-nected to an apparatu~ which uniformly empties the t~be and simultaneously forms a barrier to pos~ible vaporR ox ga~es emanating from the main ~tream of the molding material. Preferably a star fe~der i~ used.
In front of the mea~urin~ wi~dow a light source i~
arranged having a virtually con~tant color tempera~ure, ; for example a halogen lamp. ~his i~luminate~ the moldin~
material particles which are located in ~he tube. The light reflected fxom the particles is then receiv2d by three ~en ors which ~re re~ponsive to the colors green, blue or red.
The harmoniæed functioning of the feed hopper and the emptying apparatu~ ensure that the graduated tube is 2~2~9~
4 _ always kept full and the molding material particles are always close-packed. This is essen~ial for evaluating the test signal~ from the tranducers. Current averaging oYer the individ-lal te~t signals in a measuring and control unit averages out the variations in the mobile molding material surface (silhouetting and interstices). This "current average" is compared with a reference mean which has been obtained as a reference value by monitoring and storing of a reference sample. The difference between the desired value and the actual value is used to control the metering apparatuse~ of the mixer.
The Figure~ ~how the process according to ~he invention as a flow diagram and the monitoring apparatus employed for the process in the preferred use with pla~tic granules. These granule~ have a round or rectangular cross-section, a diameter of 1 to 5 mm and a particle length of 0.5 to 5 mm.
In accordance with Figure 1 a constant stream (23 of dry colored granules low~ from the granulator (1). The sampling apparatus (3) regularly takes ~ample~ via line (4) and pas~e6 them thrvugh line (5) into the monitoring ~pparatus (6) from which thay are withdrawn by the emptying apparatus (8) through the line (7) and are again introduced into the ~ranule ~tream ~2) via line (9). The si~nal3 o~tained from the monitoring apparatus (6) are proc2ssed in the computer (10) to give control input~ and are u~ed to actuate the metering control appar~tus (11).
The control ~ignal~ coming from the control apparatu~
(11) are pas~ed via cables (12) and (13) to the granu-lator (1).
Figure 2 ~how~ a preferred form of a monitoringapparatus. The sampling app~ra~u~ (33, a suction fan and the emptying apparatus ~8), a star feeder, are mounted directly on the monitoring apparatus (6). The lines ~S) and (7) are thus eliminated and line (4) enters directly into the ~eed hoppar (61) of the monitoring apparatus (6). The graduated tube (62), in which the glas~ maasur-ing window (63) is set, is connected to the feed hop-per (61). Throu~h this measuring window (63), a light source (64) illuminates, via the optical fiber bundle (67), the surface of the granules (65) as they are fed past. The reflected light is captured by the sensor bank (66) and the green, blue and red color components are supplied separately in the form of electrical signals to the computer (10), not shown.
The correct color monitoring of the granule iB hi~hly dependent on the velocity at ~hich the granules flow past the measuring window. A minLmum velocity of 1 cm/~ec has been established. The color temperature of the halogen lamp is kept constant using an appropriate brightne~
~5 control which tracks the lamp vol~age (in the present case about -6V). I~he outpu~ voltage range of each of the three color sensors is O...lOV. The signals are digitalized in an A/D-converter (12 bit3, smoothed by averaging and fed to the granule brightnes~ computation..
Thus, 4 values are available for determining the color;
: 3 measured values from the 6elective color frequency monitoring and the computed brightness. The~e are c~m-pared in a computer with the stored values of the desired granule color and made ready for further processing.
High resolution in the range of ~he desired value i8 necessary to detect even the sma~lest varia~co~ of the actual value. ~hi~ is achieved u~in~ ~ignal ~preading.
Normally, th~ voltage ~ignal i~ at + lO0 mV. The control input thus obtained for ad~u~ting the color i3 fed into an appropriate control apparatus which again ad~usts the control si~nal~ for t~e installed metering apparatu~. The~e correspond to ths valu 5 which ara customary in measurement technology, 0~2...10V or 0/4...20mA.
Controlling the me~ering ra~io of pol~mer to coloring polymer-piyment mixture( B ) give~ a cons~ant product ~2~
quality wi~hin the product stream, thi~ being based on the constant and reproducible measured values from color monitoring of the continuous sample stream.
:
~OECHST ARTIENGESELhSCHAET ~OE 89/F 224 Dr.DA/sch Description Proce~s for the preparation of a colored plastic molding m~terial S The invention relates to a process for the preparation of a colored plastic molding material, in which the color of the molding material is continuously monitored and the test signals are used indire~tly ~o control the mixing ratio of plastic and color pigment.
In the known process for the preparation of colored plastic granules, a mixture of polymer and pigment, the latter usually in concentrate form, and optionally auxiliaries, is introduced into a granulator and pro-ces~ed into granul~. Sample~ of these granules are taken and molded into test piece~, the shade of which is assessed ~isual~y or colorimetrically. If appropriate, the mixing ratio of polymer to pigment is then chanyed.
Change~ are made to this ratio until the shade of the granules coincides with the ~pecified shade.
Owing ko the time con~umed in preparing and assessing the test pieces, discrepancies such as those which are caused, for example, by differences between ~he batches of pigment, can only be detected after a lengthy period.
A~ a consequence, the proportion of sub~tandaxd product can amount to ~everal percent. In particular, ~he produc-tion of end product~ for wh~ch individ~lal compone~ts of identical shade are ~ade from granule~ from differe~t production run~ or di~ferent production unit~, requires continuou~ tracking of the ~hade during polymer pigm~nta-: 30 tion to e~sure that the varian~ of ac~ual shade from ~he control approa~he~ zero. ~o achieve thi4, the batches of granules mu~t be homogenized ln a costly additional prscP~s ~tep.
~ 2 --The object is therefore to determine the shade of pla~tic molding material~, in particular plastic granule~, continuously during their production and to use the results as rapidly as possible to control the metering of polymer and pi~ment.
It has been found that a continuous monitoring of the ~hade of the molding material is possible if the molding material particles are fed past the monitoring apparatus in a suitable manner.
The presen~ invention accordingly provides a proces~ for the preparation of a colored plastic molding material by ~dmixing at least one pigment with ~he plastic~ which comprises continuously removing samples from the dry colored molding material and feeding the~e past a light lS source, the colors green, blue and red of the light reflected from the surface of the molding material particles being monitored and the test signal~ being converted into control signal~ for controlling th~
metering apparatus for the pi~ment and the pla8~ic .
Furthermore, the invention provides a process for the continuous monitoring of the shade of a colored pl~ BtiC
molding material by illuminating the ~urface of the molding material particle~ by means of a light source and monitoring the color~ green, blus and red in the light reflected fr~ the ~ur~ace of the moldin~ material particle~, wherein the clo~e-packed molding ma~erial particle~ ara fed through tha monitoring apparatus past the mea~uring window.
Finally~ ~he invention provide~ the appara~us for the c~n~inuou~ moni~oring of the shade of a colored plastic molding material, this apparatus compri~ing a feed hopper (61), a gr~duated t~be (62) connected ther~to in which a glazs mea~uri~g window (63) ha~ been ~et, a light source (h4) out~ide the tuba (62) and in front of the measuring window (63), and ~ ~en~or b~nk (663. Light source ~643 2~a9~rl and sensor bank (66) can be arranged next to ~ach other.
PrefQrably they are combined by using an optical fiber bundle (67) to in~roduce li~ht and to lead off the reflected light. In this case, light source (64~ and sensor bank (66) are lvcated in a separate housing.
In the process according to the invention, samples are ~aken continuously from the stream of dry colored material downstream of the m:ixer. The molding material can have been obtained by various processes, the es~en-tial points being that it must be dry on the surface andthat no water condensation can form during monitoring.
Sampl~s can be taken compl~tely continuou~ly by diverting a small portion of the material flow, or else they ~an be taken continuously at tLme intervals. Preferably s~mples are taken from the material flow at regular time in~er-vals, for example by suction. The samples of material are passed from the sampling device to the ~eed hopper of the monitoring apparatus.
The monitoring apparatus consi~ts of a tube of round or square cros~ section in whose wall a window sealed with a glass plate has been fitted. At one end, the tube has the form o~ a feed hopper and at the other end it i~ con-nected to an apparatu~ which uniformly empties the t~be and simultaneously forms a barrier to pos~ible vaporR ox ga~es emanating from the main ~tream of the molding material. Preferably a star fe~der i~ used.
In front of the mea~urin~ wi~dow a light source i~
arranged having a virtually con~tant color tempera~ure, ; for example a halogen lamp. ~his i~luminate~ the moldin~
material particles which are located in ~he tube. The light reflected fxom the particles is then receiv2d by three ~en ors which ~re re~ponsive to the colors green, blue or red.
The harmoniæed functioning of the feed hopper and the emptying apparatu~ ensure that the graduated tube is 2~2~9~
4 _ always kept full and the molding material particles are always close-packed. This is essen~ial for evaluating the test signal~ from the tranducers. Current averaging oYer the individ-lal te~t signals in a measuring and control unit averages out the variations in the mobile molding material surface (silhouetting and interstices). This "current average" is compared with a reference mean which has been obtained as a reference value by monitoring and storing of a reference sample. The difference between the desired value and the actual value is used to control the metering apparatuse~ of the mixer.
The Figure~ ~how the process according to ~he invention as a flow diagram and the monitoring apparatus employed for the process in the preferred use with pla~tic granules. These granule~ have a round or rectangular cross-section, a diameter of 1 to 5 mm and a particle length of 0.5 to 5 mm.
In accordance with Figure 1 a constant stream (23 of dry colored granules low~ from the granulator (1). The sampling apparatus (3) regularly takes ~ample~ via line (4) and pas~e6 them thrvugh line (5) into the monitoring ~pparatus (6) from which thay are withdrawn by the emptying apparatus (8) through the line (7) and are again introduced into the ~ranule ~tream ~2) via line (9). The si~nal3 o~tained from the monitoring apparatus (6) are proc2ssed in the computer (10) to give control input~ and are u~ed to actuate the metering control appar~tus (11).
The control ~ignal~ coming from the control apparatu~
(11) are pas~ed via cables (12) and (13) to the granu-lator (1).
Figure 2 ~how~ a preferred form of a monitoringapparatus. The sampling app~ra~u~ (33, a suction fan and the emptying apparatus ~8), a star feeder, are mounted directly on the monitoring apparatus (6). The lines ~S) and (7) are thus eliminated and line (4) enters directly into the ~eed hoppar (61) of the monitoring apparatus (6). The graduated tube (62), in which the glas~ maasur-ing window (63) is set, is connected to the feed hop-per (61). Throu~h this measuring window (63), a light source (64) illuminates, via the optical fiber bundle (67), the surface of the granules (65) as they are fed past. The reflected light is captured by the sensor bank (66) and the green, blue and red color components are supplied separately in the form of electrical signals to the computer (10), not shown.
The correct color monitoring of the granule iB hi~hly dependent on the velocity at ~hich the granules flow past the measuring window. A minLmum velocity of 1 cm/~ec has been established. The color temperature of the halogen lamp is kept constant using an appropriate brightne~
~5 control which tracks the lamp vol~age (in the present case about -6V). I~he outpu~ voltage range of each of the three color sensors is O...lOV. The signals are digitalized in an A/D-converter (12 bit3, smoothed by averaging and fed to the granule brightnes~ computation..
Thus, 4 values are available for determining the color;
: 3 measured values from the 6elective color frequency monitoring and the computed brightness. The~e are c~m-pared in a computer with the stored values of the desired granule color and made ready for further processing.
High resolution in the range of ~he desired value i8 necessary to detect even the sma~lest varia~co~ of the actual value. ~hi~ is achieved u~in~ ~ignal ~preading.
Normally, th~ voltage ~ignal i~ at + lO0 mV. The control input thus obtained for ad~u~ting the color i3 fed into an appropriate control apparatus which again ad~usts the control si~nal~ for t~e installed metering apparatu~. The~e correspond to ths valu 5 which ara customary in measurement technology, 0~2...10V or 0/4...20mA.
Controlling the me~ering ra~io of pol~mer to coloring polymer-piyment mixture( B ) give~ a cons~ant product ~2~
quality wi~hin the product stream, thi~ being based on the constant and reproducible measured values from color monitoring of the continuous sample stream.
:
Claims (6)
1. A process for the preparation of a colored plastic molding material by admixing at least one pigment with the plastic, which comprises continuously removing samples from the dry colored molding material and feeding these past a light source, the colors green, blue and red of the light reflected from the surface of the molding material particles being monitored and the test signals being converted into control signals for controlling the metering apparatus for the pigment and the plastic.
2. A process for the preparation of colored plastic granules by admixing at least one pigment with the plastic and granulating the mixture, wherein samples are continuously taken from the dry colored granules and are fed past a light source, the colors green, blue and red in the light reflected from the surface of the granules being monitored and the test signals being converted into control signals for controlling the metering apparatus for the pigment and the plastic.
3. A process for the continuous monitoring of the shade of a colored plastic molding material by illuminating the surface of the molding material particles by means of a light source and monitoring the colors green, blue and red in the light reflected from the surface of the molding material particles, wherein the close-packed molding material particles are fed through the monitoring apparatus past the measuring window.
4. A process for the continuous monitoring of the shade of colored plastic granules by illuminating the surface of the granules by means of a light source and monitoring the colors green, blue and red in the light reflected from the surface of the granules, wherein the close-packed granules are fed through the metering apparatus past the measuring window.
5. An apparatus for the continuous monitoring of the shade of a colored plastic molding material, this apparatus comprising a feed hopper (61), a graduated tube (62) connected thereto in which a glass measuring window (63) has been set, a light source (64) outside the tube (62) and in front of the measuring window (63), and a sensor bank (66).
6. The process as claimed in claim 1 and substantially as described herein.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP3922902.5 | 1989-07-12 | ||
| DE3922902A DE3922902A1 (en) | 1989-07-12 | 1989-07-12 | METHOD FOR PRODUCING A COLORED PLASTIC MOLD |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2020947A1 true CA2020947A1 (en) | 1991-01-13 |
Family
ID=6384806
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002020947A Abandoned CA2020947A1 (en) | 1989-07-12 | 1990-07-11 | Process for the preparation of a colored plastic molding material |
Country Status (8)
| Country | Link |
|---|---|
| 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 (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN115382461A (en) * | 2022-10-31 | 2022-11-25 | 东营市宝泽能源科技有限公司 | Iron ion stabilizer production device and method with proportioning regulation function |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19626785A1 (en) * | 1996-07-03 | 1998-01-08 | Basf Ag | Process and device for the continuous color measurement of plastic molding compounds |
| BR9801134A (en) | 1998-03-26 | 2006-11-14 | Renner Herrmann Sa | apparatus and process for the continuous preparation of a fluid with automatic adjustment of its properties |
| US6469789B1 (en) | 2000-08-22 | 2002-10-22 | General Electric Company | On-line color measurement system for cooled product |
| 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 |
| SI3843966T1 (en) * | 2018-08-29 | 2023-02-28 | Erema Engineering Recycling Maschinen Und Anlagen Gesellschaft M.B.H. | Method and device for treating, processing and/or recycling of thermoplastic materials |
| WO2020193383A1 (en) * | 2019-03-26 | 2020-10-01 | Covestro Intellectual Property Gmbh & Co. Kg | Method for determining a color value of a 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 |
| CN113546552A (en) * | 2021-07-27 | 2021-10-26 | 北京住总集团有限责任公司 | Mud stirring device |
| 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 |
Family Cites Families (8)
| 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 (en) * | 1971-07-07 | 1973-01-25 | Hoechst Ag | Polymer discolouration measurement - during flow by optical absorption to detect quality defects |
| JPS5830641A (en) * | 1981-08-18 | 1983-02-23 | Satake Eng Co Ltd | Measuring device for degree of refinery of continuous flow grains |
| 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 |
| DE3505036A1 (en) * | 1985-02-14 | 1986-08-14 | Werner & Pfleiderer, 7000 Stuttgart | METHOD AND DEVICE FOR THE CONTROLLED ADDITION OF COLOR CONCENTRATES IN A SNAIL MACHINE |
| JP2567601B2 (en) * | 1987-03-27 | 1996-12-25 | サンスター技研 株式会社 | Method of inspecting coating state of coating agent |
| DE3731804A1 (en) * | 1987-09-22 | 1989-03-30 | Agfa Gevaert Ag | ARRANGEMENT FOR DETERMINING THE DISPERSION DEGREE OF MAGNETIC PIGMENTS IN A DISPERSION |
-
1989
- 1989-07-12 DE DE3922902A patent/DE3922902A1/en not_active Withdrawn
-
1990
- 1990-07-07 ES ES90113038T patent/ES2056308T3/en not_active Expired - Lifetime
- 1990-07-07 EP EP90113038A patent/EP0407927B1/en not_active Expired - Lifetime
- 1990-07-07 AT AT90113038T patent/ATE107190T1/en active
- 1990-07-07 DE DE59006110T patent/DE59006110D1/en not_active Expired - Fee Related
- 1990-07-10 JP JP2180739A patent/JPH0345304A/en active Pending
- 1990-07-11 AU AU58870/90A patent/AU644086B2/en not_active Ceased
- 1990-07-11 ZA ZA905423A patent/ZA905423B/en unknown
- 1990-07-11 CA CA002020947A patent/CA2020947A1/en not_active Abandoned
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| US5723517A (en) * | 1993-10-04 | 1998-03-03 | General Electric Company | System for controlling the color of compounded polymer(s) using in-process color measurements |
| CN115382461A (en) * | 2022-10-31 | 2022-11-25 | 东营市宝泽能源科技有限公司 | Iron ion stabilizer production device and method with proportioning regulation function |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0407927A3 (en) | 1992-07-22 |
| DE3922902A1 (en) | 1991-01-17 |
| EP0407927B1 (en) | 1994-06-15 |
| DE59006110D1 (en) | 1994-07-21 |
| ES2056308T3 (en) | 1994-10-01 |
| AU644086B2 (en) | 1993-12-02 |
| EP0407927A2 (en) | 1991-01-16 |
| AU5887090A (en) | 1991-01-17 |
| ZA905423B (en) | 1991-04-24 |
| ATE107190T1 (en) | 1994-07-15 |
| JPH0345304A (en) | 1991-02-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |