hichinaprinting

removing ink and other finishing materials, like coatings, sizing, and adhesives from printed paper.

The complex deinking process is what makes recycling paper difficult and ultimately adds to the cost of a recycled sheet of paper. To produce high-quality recycled or recycled content papres for printing and writing, the deinking process needs to be thorough.

The goal is to end up with reusable fiber that has few impurities, since impurities lower the quality of a reycyled sheet and can some- times damage equipment in the papermaking and printing process. Modern offset and flexographic ink, photocopier and laser printing “ink,” ultraviolet and thermography coatings, and adhesives make it increasingly difficult to deink paper. deinking process see also bleaching, flotation, pulping wood, recycled paper.

There are many ways to classify the paper stocks, but generally speaking， most paper stocks used in the printing industry fall into two classifications: uncoated and coated stock.

Uncoated Stocks

Uncoated stock is paper that has no coated pigment applied to reduce the absorbency or increase the smoothness. The uncoated finishes can be described as vellum, antique, wove, or smooth.

Coated Stocks

A coated stock has a surface coating that has been applied to make the surface more receptive for the reproduction of text and images in order to achieve sharper detail and improved color density. By adding a coated clay pigment, the objective of coating the stock is to improve the smoothness and reduce the absorbency. Coated paper finishes can be categorized as matte, dull, cast, gloss, and high gloss. The coating can be on both sides of the stock (coated two sides, “C2S”) or on one side only (coated one side, “C1S”). Coatings added to groundwood papers give them a greater degree of permanency and the natural tendency for goundwood papers to yellow is reduced.