Today, printing services are very popular in many industries: booklets, leaflets and offset printing are in great demand all over the world.
The printing industry uses a large number of different resources and materials in its activities. These resources and materials are consumed in large quantities, inevitably leading to the generation of waste. These can be ornaments, removers, paints, developers, rags, etc.
Wastes such as waste paper are unavoidable because printing wastes may contain substances that are unsafe for the environment, such as chemicals in paint in printing materials.
Disposal of printing waste
Collect recyclable waste containing fixer and developer, and recover silver compounds from it.
Varnish and printing ink account for about 5% of the total waste, but they will affect the recycling process. When recycled paper is recycled, deinking will occur, but the waste will be classified according to the paper type first. After crushing in heated water alkaline medium. Remove paint by separating from cellulose fibers. The recycled waste is used as a recyclable material for the manufacture of cardboard and paper.
When printing with environment-friendly ink, the waste can be used as fertilizer.
The removal of various dyes from printing waste depends on the nature of the dyes:
The cross-linking structure of toner and UV ink makes them difficult to remove.
Mineral oil based paints and solvent based paints can be easily removed.
Vegetable oil will hinder paint removal due to oxidative polymerization.
To sum up, we can conclude that the more environmentally friendly and safe the materials are, the easier the recycling process will be.
Treatment of printing waste
Today, the following methods are used to deal with printing waste:
Processing;
Crush (chop);
Burning.
Safe Disposal Technology of Printing Waste
The waste generated by the printing industry is a substitute for raw materials such as cellulose, wood and pulp.
The safe disposal technology of printing waste means a two-stage wet cleaning of materials, so that the waste can be used to produce paper and cardboard.
The technology includes the following operations:
Waste paper dissolution - in hydraulic diluent, waste is crushed and decomposed into fibers;
Remove various impurities from waste paper;
Additional decomposition of waste into fibers;
Fine cleaning is in progress.
