The first is the classification of paper.
Waste newspapers, books, old textbooks,
enterprise brochures, express boxes, packaging boxes, milk boxes, plastic film
mulching, carbon paper, wax paper, plastic smooth waste paper, toilet paper,
paper diapers and synthetic paper are all paper waste. The recyclable parts of
so many kinds of paper waste mainly include waste newspapers, books, old
textbooks, enterprise brochures, express boxes, packaging boxes and milk boxes.
Generally, recycled paper products are
classified according to their different categories. There are roughly six
categories of paper products:
The first category is white waste paper,
which refers to the paper without words and pigment contamination that has not
been printed or the remaining edges cut during printing in the printing plant.
The second type is the book block, which
refers to those books that have not been issued or have been issued but have
not been sold after printing.
The third category is those useless books
and old newspapers.
The fourth category is our common cardboard
box, which is also the most paper waste in our life.
The fifth category is kraft paper, which
has high tear strength and dynamic strength. Generally, file bags, old
envelopes and paper packaging bags are common.
The sixth category is mixed waste paper,
which can only produce the most low-end paper products after recycling.
Plastic film covering, carbon paper, wax
paper, plastic glossy waste paper, toilet paper, paper diapers, synthetic paper
and other paper wastes are not recyclable and should be disposed of in other
wastes. Under special circumstances, the following paper wastes cannot be
recycled. Contaminated paper: toilet paper, napkins, diapers, food packaging
paper (boxes) immersed in oil stains, etc. cannot be recycled. For some papers
with complex components, foreign matters cannot be fully eliminated during
regeneration. For example: plastic film, carbon paper, etc. The waterproof
paper is attached with a layer of plastic film on the surface, so it is not
easy to separate from the paper and cannot be recycled, such as disposable cup,
instant noodle cup, etc.
If we know the recycling type of waste
paper, why should we recycle it?
Economic value is only a factor to promotewaste paper recycling. When it is impossible to avoid the use of paper
products, waste paper recycling plays an inestimable role in the ecological
environment. One ton of waste paper can produce 850 kilograms of recycled paper
with good quality, save 3 cubic meters of wood, save 100 cubic meters of water,
save 300 kilograms of chemical raw materials, save 1.2 tons of coal and save
600 degrees of electricity. According to the production of 20000 tons of office
recycled paper, 66000 cubic meters of wood can be saved a year, which is
equivalent to protecting 520000 trees or adding 5200 mu of forest. China is
rich in waste paper resources. Relevant data show that China's paper
consumption is about 35 million tons per year. Based on one-third of the waste,
more than 10 million tons of waste paper can be recycled every year. The
environmental pollution caused by recycled paper pulping process to the
atmosphere and water quality is much lower than that of ordinary paper. The
paper industry has a large amount of waste water and wide distribution. It is
one of the most polluted industries in China. The production of 1 ton of pulp
requires 100 tons (wood pulp) to 400 tons (straw pulp) of water, and most of
these sewage needs to be discharged. The black liquor pollution produced by
papermaking is the most serious, and 10 tons of black liquor are discharged for
every 1 ton of pulp produced. In the manufacturing process of recycled paper,
the wastewater discharge can be reduced by 50%. In particular, several
processes in the early stage of papermaking can be omitted, and the most
polluted black liquor will not be produced.