For Printing Ink
Pigments are colored organic materials in the form of insoluble powders, which are mixed with various resins, solvents and additives to manufacture various types of printing inks.
ICHO
®PRINT is safe and eco-friendly specialized products meant for coloration of printing inks include letterpress, offset, flexo, gravure, metal decorative, silk screen and heat set / coldset inks. ICHO
®PRINT is fine stable pigment powder, which have wide compatibility with various acrylic binders used in printing ink. Pigments in ICHO
®PRINT is selected to impart excellent dispersion characteristics with excellent gloss, transparency, Rheology, Thixotropic properties to impart good gloss and consistent color value and tint strength.
Product Details
Each product is described by the company's product code/name, chemical class like color index number, chemical name and C.A.S. number.
Shade Illustration
The shade illustrations printed in this brochure are printed with CMYK on offset technique. This will produce a clean, non-staining and smooth color effect to indicate approximate shade color effect, which is used as a guideline for printing inks and allied product technologies.
Colorist Properties
Spectrophotometer is used to measure various color
strengths for full shade (tones).
L = Lightness Contribution
C = Chroma contribution
H = Hue angle
CIELAB D65 = Artificial day light
PHYSICAL PROPERTIES
Specific Gravity
Specific gravity has been determined in an inert liquid at 20°C.
Sieve Residue
Weighed quantity of pigment in water is measured and wet sieving of pigment water slurry under running water tap is weighed. Residue obtained on 240- mesh screen is dried and weighed. This is noted as per DIN 53195.
Moisture Content
Pigment sample is heated under infrared lamp at 105°C. When constant weight is reached, the loss of weight of volatile matter is noted as moisture content. This is as per ISO 787/2.
PH of Water extract
Aqueous pigment slurry of 5% pigment is filtered off. Calibered glass electrode pH meter at normal room temperature measures the pH value of filtrate.
Specific Conductivity
Aqueous pigment slurry of 5% pigment is filtered off. Calibered conductivity meter measures the specific conductivity of filtrate. This indicates the figure of water-soluble electrolytes in the pigment.
Light Fastness
The prints of the pigments dispersed in printing ink medium is exposed along with Standard Blue Scale and rating expressed in 1 to 8 scale. 8 expresses excellent and 1 expresses poor fastness. Tint is at reduction at 1:5 using 25% titanium dioxide.
