Presentation on theme: "In-line measurement and correction of Color and physical properties"— Presentation transcript:
1In-line measurement and correction of Color and physical properties Symposium on Color and Appearance InstrumentationApril 15-16, 2003Chicago, ILGirish Malhotra, President,EPCOT International, Pepper Pike, OH, USACarlos Arthur Peixoto, Process Engineer,Eduardo Schotgues, Software Engineer,Paulo R. Pfeil Instrument Engineer-NTP Production Technology Center,Renner Herrmann SA, Porto Alegre, Brazil
2CHARACTERISTICS MEASURED COLORPHYSICAL PROPERTIESDISPERSION PARTICLE SIZEIt is necessary to measure and match color and other properties for the production of any colored liquid. A sample is taken off-line and the necessary tests are done to determine deviation from the goal. Adjustments are made and the test process repeated till the specifications are met.This repeated process can and does prolong the batch cycle time. If the solvent is lost after the specifications have been met, it may add additional complexity. All these add cost to the product.Once the specifications are met the batches are not checked and if there is specification variation, no adjustments are made to meet specifications.
3IF SPECS CAN BE CORRECTED AND MET WITHOUT SAMPLING BENEFITS WILL BE: REDUCED PROCESS CYCLE TIMEIMPROVED PROFITABILITYHIGHER AND CONSISTENT QUALITYIn today world the specifications are checked by taking a sample off-line.If the colored liquid specifications can be measured in line as the product is being produced, the user of our technology will improve profitability by reducing the batch cycle time. The user can also improve quality of their products.
4TECHNOLOGIES COLORCELL (REFLECTION ONLY) MULTICELL (TRANSMITION AND REFLECTION)We have two technologies that can allow one to measure the characteristics of the colored liquids without taking a sample off-line.
5COLORCELL TECHNOLOGY SCHEMATIC SpectrophotometerReflectionFixed PlateWIPERLiquidFixed PlateColorcell Technology is a reflection only technology. The liquid passes between two fixed plates and the color of the liquid is read using a commercially available spectrophotometer. There is a wiper in the cell that cleans the glass periodically to keep it clean.Figure 1
6MULTICELL TECHNOLOGY SCHEMATIC SpectrophotometerTransmissionReflectionFixed PlateWIPERLiquidMovable PlateTransmissionMulticell Technology also has two plates but the lower plate is a movable plate. It can move between 20 to 3000 microns to create a liquid film. A white light passes through the film and it transmission is measured. We can also measure the reflection of the liquid. Thus this technology can read transmission and reflection.Wiper are used to prevent any build up of the coating on the glass substrate.White LightFigure 2
7MULTICELL Figure 3 Electronic finger print is created and matched. Multicell creates a three dimensional finger print for a liquid. This is matched as the product is produced.Electronic finger print is created and matched.Figure 3
8TECHNOLOGY APPLICABILITY COATINGS (ARCHITECTURAL, AUTOMOTIVE, WOOD, INDUSTRIAL, PAPER)PRINTING INKSPIGMENT AND DYE DISPERSIONSTEXTILESCOLORANTSCOSMETICSFOODMINERALSOur technology can be used in these businesses.
9MULTICELL TECHNOLOGY WHITE LIGHT vs. WHITE BASE REFLECTION AND TRANSMISSION THROUGH FILM MEASURED CONTINUOUSLYELIMINATES USE OF WET STANDARDSCONTINUOUS COLOR, STRENGTH AND HIDING POWER MEASUREMENTCONTINUOUS VISCOSITY, DENSITY AND TEMPERATUREFEED RATES ADJUSTED IN LINE TO PRODUCE QUALITYThe Multicell technology uses a white light vs. white base. Use of white light eliminates human intervention and errors. This eliminates the use of wet standards, another potential source of human error.We measure reflection and transmission continuously for a product (batch or continuous). This allows us to continuously control the desired performance and physical properties. This is accomplished by adjusting feed rates of various liquids and only QUALITY is produced.Since we have eliminated significant human intervention, our technology reduces batch cycle time. This not only reduces costs i.e. improves profitability, it also increases plant throughput with minimal or no investment. ROI is very high.
10TECHNOLOGY (cont.) DEVELOPED BY RENNER HERRMANN, S. A. COMMERCIAL Du Pont Performance Coatings Automotive refinish coatings (Brazil) E. I. du Pont - Mt Clemens Automotive primers (Michigan) Renner Sayerlack (Brazil)CADAM ( Caulin do Amazonas )Other installations underway
11FINANCIAL IMPACT INVENTORY INTEREST OBSOLESCENCE MANUFACTURING COST REDUCED WASTESERVICE AND QUALITYThese factors influence profitability of a company using our technology to produce coatings, colorants, inks, dyes, pigments, cosmetics.
12FINANCIAL IMPACT Savings 15-25% We believe that companies using our technology can achieve savings of about 15-25%. These savings are business dependent.
13MANUFACTURING CONFIGURATION Final ProductMANUFACTURING CONFIGURATIONLiquid 2Liquid 1Liquid 3TankMULTICELLLiquid 4MIXERLiquid 5Various liquid ingredients are metered to a small agitated mixer. A small volume of the mixed liquid is sent to the cell where its color characteristics are compared against the standard. If different from the standard, automatic flow rate adjustments are made to the flow rate of the liquids going to the mixer. Majority of the flow from the mixer is sent to the Recycle Tank. This liquid is also sent to the mixer and its flow is controlled. As soon as the specifications are matched, the liquid being sent to the Recycle Tank is diverted to its final destination. The liquid in the Recycle Tank is fed to the mixer so that at the end of the run there is nothing left in the tank.We measure and control physical properties so that besides color we have control of viscosity and density also.As long as the product is being produced a small portion is sent to the cell for quality check.Advantages of this method are no waste is produced. Quality from the first to the last can or drum is exactly the same.The system is cleaned very quickly and a new product of any desired color can be produced.Liquid 6Liquid 7Recycle TankLiquid 8Figure 4
14TEST RESULTSSome results of the measurement using the Colorcell and the Multicell are shared.
15KAOLINWe tested different composition kaolin slurries through the Colorcell.Table 1
16CONVENTIONAL DRY METHOD Reflectance results using the conventional dry method are illustrated.Figure 5
17WET METHOD USING COLORCELL We can measure and differentiate each of the slurries. This allows us to control the exact composition of kaolin in wet state giving manufacturing greater control on the manufacturing process, quality and costs.Figure 6
18Figure 7 Wet DE =0.24 Dry DE =0.22 Yellow solvent coating This slide shows the results of a yellow solvent based coating using Colorcell. The wet and dry method results are compared. The difference between the samples and their standards is negligible. However the wet liquid testing allows the product specifications to be met in much shorter time. Corrections are done as the product is produced rather than after all has been mixed. The dry testing may require multiple corrections.Wet DE =0.24Dry DE =0.22Yellow solvent coatingFigure 7
19Figure 8 Wet DE =0.27 Dry DE =0.28 Blue solvent coating This shows reflectance of a blue solvent based coating.Wet DE =0.27Dry DE =0.28Blue solvent coatingFigure 8
20WOOD COATING DYE Figure 9 Reflection Dry Curves 100 90 80 70 60 %R 50 STANDARD70BATCH60%R50403020The next three slides show the results for a wood coating using the Multicell. Fig. 9 shows the reflectance using the conventional method. We added 1% dye to the standard and measured the batch reflectance.10400450500550600650700NMFigure 9
21WOOD COATING DYE Figure 10 Multicell Transmission (20µm) 100 90 80 Standard70Batch60%T50403020This slide shows the transmission of the same two liquids using a 20 micron path length. The samples were measured as is, without dilution.10400450500550600650700NMFigure 10
22WOOD COATING DYE Figure 11 Conventional Method 100 90 80 70 60 %T Standard50Batch40302010This slide shows the transmission using the conventional method. In the conventional method the samples have to be diluted.400450500550600650700NMFigure 11
23WOOD COATING DYE Figure 12 Relation between Kstd and Kb 2.50 2.00 1.50 Kstd/Kb(Multicell)Kstd/Kb (Conventional)1.000.500.00Figure 12 compares the absorption coefficient (Lambert-Beer’s Law) for the Multicell vs. the conventional method. The results are very comparable. Since we have an excellent correlation between the two test methods, the wet test method would be a preferred method as it will improve profitability by reducing cycle time, waste and inventories.The K (absorption coefficient) for the two samples calculated by the equation:T = e-K*C*XWhere:T = TransmittanceC = ConcentrationX = Path length thicknessK = absorption coefficient400450500550600650700NMFigure 12
24COLORANT EXPERIMENT ITERATION USING MULTICELL This table shows results for a colorant. This table shows how we started with a hypothetical formula to meet a certain specification. The liquid “uncorrected” was passed through the cell. Based on the standard stored in the system, the software made a correction shown in the next column. The first correction shows proximity to the standard as illustrated by Dtransmission , Dreflection and strength.Table 2
25This graph shows the comparison of the standard, uncorrected and first correction sample. The speed and accuracy illustrates the value of the technology to the manufacture of colored liquids.Figure 13
26SUMMARY TECHNOLOGY IS COMMERCIAL. PRODUCTS DEVELOPED IN ANY PART OF THE GLOBECAN BE PRODUCED AT THE MOST COST EFFECTIVE PLACE.TECHNOLOGY CAN BE RETROFITTED IN EXISTING PLANTS.MARKET AND PRODUCT DEVELOPMENT TIME IS SIGNIFICANTLY REDUCED.
27QUESTIONS THANK YOU VERY MUCH. CONTACT: Girish Malhotra, P.E. EPCOT International29150 Bryce RoadPepper Pike, OH 44124(P)(F)Profitability through Simplicity