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Why do we need paper? What paper means to our world

Paper was invented in China in 105 A.D. and is used for a wide range of purposes today. It is hard to imagine life without paper. The most important value of paper is the ability to store information on it. The invention of paper is one of the great achievements of mankind, it made it possible to preserve knowledge and pass it on to other future generations, books, notebooks, newspapers, magazines. What is written in the sand cannot be preserved, records disappear, not much can be preserved on stone monuments, there are not that many stones to be found, it is difficult to store such media on the scale of history.

Knowledge of the paper industry: what are the process conditions for waste paper deinking?

Deinking of waste paper is usually carried out in a hydro pulper in intermittent operation. To obtain good deinking effect, must consider the following process conditions:

Paper mill paper industry knowledge: the application of various chemicals in the paper industry

Paper industry is the fibre as raw material chemical processing industry, in the pulp, bleaching, pulping, copying and paper after processing this process at all stages, are inseparable from the application of various chemicals.

Origin of the name paper A brief history of the art of papermaking

The art of papermaking has a long and rich history. Paper has become one of the most widely used writing materials in the world. It is made from a variety of different materials and comes in a wide range of colours with many options.

What are the printing processes and methods?

modern applications, the term printing can be applied to any process that produces a wide range of reproductions. However, the discussion here will be confined to the main direct or contact printing methods, whereby reproductions are produced from the lead plates or image carriers of a printing press; these methods still account for over 90 per cent of commercial printing. This is not, of course, to minimise the growing importance of non-contact printing such as electrostatic and electrosensitive copying, thermal printing, inkjet printing and laser printing.

What is the whiteness of pulp? How to test whiteness?

The whiteness of pulp is measured using its ability to reflect monochromatic light in comparison to a known standard whiteness (usually magnesium oxide). The most commonly used instrument is the Zeiss Elrepho reflectometer, which emits a scattered light source. The whiteness measured for fully bleached sulphite pulp can be as high as 94 Elrepho units, while unbleached sulphite pulp can be as low as 15 Elrepho units.