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Kolorjet Chemicals Pvt Ltd.
Mumbai, Maharashtra
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Paper Industry
Paper Industries are widely using dyes form last so many decades. Seeing the growth in the paper industry it can be safely assumed that Dyes for paper industry has a very promising future. Given below is a comprehensive list of the various grades of paper that are open to dyeing:
Writing and printing paper
Tissue - Facial, toilet, towel, napkin
Copier papers
Boards/Cover papers
Decorative laminated paper
Packaging grades - corrugated case stuff
Envelope grades
Specialty papers like, label, laundry tag, posters
The dyes that are used includes sulphur dyes and cationic direct dyes. Other than these two popular options acid dyes and basic dyes are also used. Sulphur dyes are reduced alkaline solutions. For example to get the colour black, a polymer is obtained by the result of a reaction between. 2, 4 dinitrophenol and sodium polysulphide. The polymer structure is shown below:
Coming to the Cationic Direct Dye, some features which makes them suitable towards use in paper are:
A planar molecular structure
An extended conjugation
An excess of positive charge over the negatively charged surface groups
A typical structure of a cationic direct dye is given here:
Criteria for selection of the Dye
Optimum depth
Clear backwaters
Good affinity
Right shade
Show light fastness
Show bleed fastness
Provides stability to temperature and humidity
Low or no metamerism
Does not affect any other paper chemical/process or parameters
Compliant with regulations in force
Safety in Handling
New Trends appearing in paper dyeing
Trend towards new coloration techniques fueled by pressures of a clearer backwater, pressures from environmental watch dogs and cost of production.
Sophisticated high speed machines are driving the trend of reduction in the use of traditional basic dyes and increasingly giving way to specialty modified Basic and Direct Dyes.
A definite shift to continuous dyeing/size press dyeing.
Newer opportunities propelling new applications like Carbon less papers/Thermal Papers.
Turn to Eco-friendly dyes
Dyes that are free of harmful amines.
Dyes that are free of Heavy Metals.
Certification from ETAD (Ecological and Toxicological Association of dyestuff).
Dyes that are Biodegradable.
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Colour Index
What is a Color Index
Features of the Color Index
Highlights of the Color Index
What is Dye
Evolution of Dyes
What makes the Dyes colored ?
Classification of Dyes
Chemical classification of the Dyes
Dye House
Benchmarks of a Dye House
Dyeing Process of Leather
The Following Table Gives A Good Comparison Among Various Classes Of Pigments
Application of Dyes and Pigments
Pigments
Cement Industry
Colorants for Agriculture Industry
Colorants for Security Printing
Dyes in Medicine
Rubber Industry
Ceramics Industry
Colorants for Cosmetics Industry
Glass Industry
Wire and Cable Industry
Colorants for Plastic Industry
Colorants for Printing Inks
Dyes for Water Based Inkjet Inks
Other
Dyes in Concrete Industry
Paper Industry
Woodworking Industry
Dyes & Pigments in Construction Industry
Dyes in Heat Transfer Printing
Pigments in Paint Industry
Glossary
What are dyes?
What are pigments?
Buyers Guide to Dyes
Buyer's Guide to Pigments
Global Dyestuff Industry
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Product Range
Solvent Dyes
Pigments
Dyestuffs
Synthetic Food Colors
Direct Dyes
Ultramarine Pigments
Blended Food Colors
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Dyes for Wax Printing
Inkjetdyes
Inorganic Pigments
Ribafix M Dyes
Acid Dyes
Resist Salt
Dye House
Caramel Color
Organic Pigments
Leather Dyes
Natural Dyes
Leuco Dyes
Oxidation Dyes
Basic Dyes
Reactive Dyes
Ribazol Vinyl Sulphone Dyes
Dyesintermediates
Pigments1
Pearlescent
Dyes Intermediates
Inkjet - Dyes
Metal-Complex Dyes
Carbon Black
Optical Brightner
Natural Food Colors
Optical Brighteners
Synthetic Dyes
Acid Dyes Types
Basicdyes
Directdyes1
Inorganicpigments
Ribafix Me Dyes
Textile Dyes
Organic Vs Inorganic Pigments
Buffer
Sublimation Dyes
Smoke Dyes
Mixed Metal Oxide Pigment
Fluorescent Dyes
Directdyes
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