By Ronald M. Harris
The papers during this anthology have been offered in the course of seven ANTEC and RETEC symposia among 1995 and 1998, and chronicle the various advances within the plastics coloring expertise box in the course of that point span. The unifying topic of the papers is "creating extra value.The interactivity of the package deal layout strategy has endured to call for advances in coloring expertise, and the worth of having the ability to take advantage of product visual appeal is obviously obvious. in a different way to create worth is via being responsive via "Speed to industry. brands and providers need to reply to the call for in their shoppers, but fabricators can't be overlooked of their hope for first run popularity of colour. these kind of concerns etc are mentioned inside this authoritative evaluate of coloring expertise.
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Additional info for Coloring Technology for Plastics
Besold, Qualitiy control test methods, Echart-Werke, Alu-Flake Schriftenreihe 2 E. Roth, Dispersing instructions for Stapa Metallic, Mobilux and Metallux pigments, Eckart-Werke Alu-Flake Schriftenreihe 2. L Gall, Farbmetrik auf dem Pigementgebiet, BASF, 1970, S 399 Publikation. Metallic Looking Plastics. , USA ABSTRACT The application of aluminum pigments in plastics presented a problem in the past because of the flow lines which they caused in injection molded parts. By using large size aluminum pigments, with an average particle size of 60 µm to 330 µm and larger, it is possible to avoid these flow lines and produce metallic looking plastic parts.
The transparent colorants which were used were a yellow (Fe2O3), red (Carmine), blue (iron blue) and green (Cr2O3). Other colorants such as phthalocyanine blue, phthalocyanine green, quinacridone red can be substituted for these pigments and actually such pigments are available. Generally the concentration of all the colorants was approximately 2% to 5% by weight based on the mica platelets. At these concentrations the color intensity of the colorants was approximately equivalent to the reflection intensity of the interference pigments.
Another way to reduce scattering is by using round flakes, illustrated by the SEM picture. The round edges scatter the light less because of a reduced ratio of surface to circumference and disFigure 2. Comparison of aluminum flakes. Left - round, right - normal. play the brightest metallic effect of all aluminum pigments. The additional factor in achieving optimum brightness is to keep the particle size distribution as narrow as possible in order to reduce the amount of small particles present.
Coloring Technology for Plastics by Ronald M. Harris