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paper recycling
There are three categories of paper that can be used as feedstocks for making recycled paper: mill broke, pre-consumer waste, and post-consumer waste. ''Mill broke'' is paper trimmings and other paper scrap from the manufacture of paper, and is recycled internally in a paper mill. ''Pre-consumer waste'' is material which left the paper mill but was discarded before it was ready for consumer use. ''Post-consumer'' waste is material discarded after consumer use, such as old corrugated containers (OCC), old magazines, and newspapers.〔 Paper suitable for recycling is called "scrap paper", often used to produce molded pulp packaging. The industrial process of removing printing ink from paperfibers of recycled paper to make deinked pulp is called deinking, an invention of the German jurist Justus Claproth.
==Paper recycling process==
The process of waste paper recycling involves mixing used paper with water and chemicals to break it down. It is then chopped up and heated, which breaks it down further into strands of cellulose, a type of organic plant material; this resulting mixture is called pulp, or slurry. It is strained through screens, which remove any glue or plastic that may still be in the mixture then cleaned, de-inked, bleached, and mixed with water. Then it can be made into new recycled paper.〔(【引用サイトリンク】url=http://www.tappi.org/paperu/all_about_paper/earth_answers/earthanswers_recycle.pdf )〕
The share of ink in a wastepaper stock is up to about 2% of the total weight.〔R. McKinney: Technology of Paper Recycling, 1995, p. 351. ISBN 9780751400175〕
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