Volume 3, Number 4
- Contaminants-in waste paper are a big problem for paper mills
that use recyclable material. The worst contaminants are-
pressure-sensitive adhesives (like those used on the back of the
mailing label for newspapers) and hot melt adhesives.
- Companies that recycle newspapers can't let them sit around too
long, or they will degrade to the point of unusability. Six months
is the limit; if subjected to light or heat, the limit is less than
- In Japan, which recycles half of all its wastepaper, the Japan
Paper Association has announced a plan to increase wastepaper
utilization 1% each year until it reaches 55%.
- Deinking chemicals listed and described on p. 157 of the
September Pulp & Paper are sodium hydroxide
(caustic), sodium silicate, hydrogen peroxide, a chelate/sequestrant
to stabilize the hydrogen peroxide in the presence of metal ions,
and surfactant. The phosphoric derivative of DTPA, DTPMPA, works
better than DTPA in several respects.
- Prime Fiber Corporation received a $225,000 grant from the
National Science Foundation, effective October 1, for three years,
to pursue a project entitled "Conversion of Paper Mill Sludge into
Pulp Substitute and Papermaking Clay"
- A letter to the editor, and an author's reply to the letter, in
the September/October Garbage, made the point that
high-grade deinking plants should not be seen as sources of dioxin
because they usually use hydrogen peroxide or sodium hypochlorite.
Although sodium hypochlorite contains chlorine, it is used in a
high-alkaline environment, which prevents the chlorine molecules
from breaking out of the molecule to recombine into dioxins and
furans. It is still undesirable from one standpoint: it can create
- Uniform labelling standards for recycled paper, based on uniform
definitions, are sought by the Coalition of Northeastern Governors
and the Northeast Recycling Council, according to a news item an p.
18 of the American Papermaker for August. (ASTM
Committee D06.40 is working toward a similar goal.) Currently under
consideration are proposals that would allow a product or package to
be labelled "recyclable!' if it is recycled at a 20%. rate this
year, 35% by 1995 and 50%. by 2000. To be called "recycled," most
products would have to contain 50%. secondary material, including
15%. to 40% consumer waste.
- Canadian Pacific Forest Products Ltd., a Canadian company that
sells newsprint on the American market, is now buying old newspapers
from New York towns for $25/ton in order to be able to meet the
demand for recycled newsprint. It is installing deinking facilities
at two mills.