Search results
Results From The WOW.Com Content Network
Deinking is the industrial process of removing printing ink from paperfibers of recycled paper to make deinked pulp. The key in the deinking process is the ability to detach ink from the fibers. This is achieved by a combination of mechanical action and chemical means. In Europe the most common process is froth flotation deinking.
The de-inking process during paper recycling is also a source of emissions due to chemicals released in the effluent. The European Recovered Paper Council has developed the ‘deinkability scorecard’ so that the printed paper products which have the best recyclability when they are deinked can be identified. [17] [18]
It is then cleaned, de-inked (ink is removed), bleached, and mixed with water. Then it can be made into new recycled paper. [4] The share of ink in a wastepaper stock is up to about 2% of the total weight. [5] In the mid-19th century, there was an increased demand for books and writing material.
Chematur's Super Critical Fluids technology was acquired by SCFI Group (Cork, Ireland) who are actively commercializing the Aqua Critox SCWO process for treatment of sludge, e.g. de-inking sludge and sewage sludge. Many long duration trials on these applications have been made and thanks to the high destruction efficiency of 99.9%+ the solid ...
A process for removing printing inks from recycled paper was invented by German jurist Justus Claproth in 1774. [7] Today this method is called deinking . It was not until the introduction of wood pulp in 1843 that paper production was not dependent on recycled materials from ragpickers .
In intaglio printing, the lines to be printed are cut into a metal (e.g. copper) plate by means either of a cutting tool called a burin, held in the hand – in which case the process is called engraving; or through the corrosive action of acid – in which case the process is known as etching. [6] [7]
AOL Mail welcomes Verizon customers to our safe and delightful email experience!
Mechanical pulping process [25] Thermomechanical pulp is pulp produced by processing wood chips using heat (thus "thermo-") and a mechanical refining movement (thus "-mechanical"). It is a two-stage process where the logs are first stripped of their bark and converted into small chips. These chips have a moisture content of around 25–30 percent.