Upgrading waste paper by treatment with sulfite waste liquor
OwnerEric S. Priorinventor
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Abstract
Fibrous materials are disclosed having incorporated therein upgraded waste sulphite liquor; the liquor is neutralized, e. g., with sodium borate, sodium aluminate, reacidified, if needed, with alum; the modified sulphite waste liquor of hardwoods as well as articles of manufacture of fibrous materials such as corrugated medium made of waste materials are diclosed; further, articles of manufacture thus modified include starch or sizing and are within the scope of the invention.
Claims22
An article of manufacture comprising a cellulosic fibrous sheet material having incorporated therein, at the wet press or size press, from about 5 to 30 percent by weight of waste sulfite liquor, which liquor has been neutralized to a pH of about 6.5 to 8.0 with sodium aluminate prior to addition to said sheet material.
As an article of manufacture, a dried cellulosic corrugated medium, including waste fiber material, to which has been added at the wet press or size press from about 5 to 30 percent by weight of waste sulfite liquor, said waste liquor having been neutralized prior to addition to said medium to a pH of about 6.5 to 8.0 with sodium aluminate, said waste liquor having further been reacidified prior to addition to said medium to a pH of 5 to 6 with alum and wherein ethylene oxide polymer is added thereto in an amount from about 0.25 to 3 grams per 100 grams of waste liquor at 45 to 50 percent solids concentration.
As an article of manufacture, a cellulosic fibrous sheet material having incorporated therein at the wet press or size press from about 5 to 30 percent by weight of waste sulfite liquor, which liquor has been neutralized to a pH of about 6.5 to 8.0 with sodium aluminate prior to addition to said sheet material and wherein said waste liquor includes polyethylene oxide.
As an article of manufacture, a dried cellulosic corrugated medium having incorporated therein at the wet press or size press from about 5 to 30 percent by weight of waste sulfite liquor which liquor has been neutralized to a pH of about 6.5 to 8.0 with sodium aluminate, and reacidified to a pH of 4 to 6 with alum prior to addition to said medium.
As an article of manufacture, a dried cellulosic corrugated medium, including waste fiber material, to which has been added at the wet press or size press from about 5 to 30 percent by weight of waste sulfite liquor, said waste liquor having been neutralized prior to addition to said medium to a pH of about 6.5 to 8.0 with sodium aluminate and wherein ethylene oxide polymer is added to said waste liquor in an amount from about 0.25 to 3 grams per 100 grams of waste liquor at 45 to 50 percent solids concentration.
As an article of manufacture, a corrugated medium comprising cellulose fibers including waste fibers and from about 5 to 30 percent by weight of waste sulfite liquor which has been neutralized to a pH of about 6.5 to 8.0 with sodium aluminate and reacidified with alum prior to addition to said medium at the wet press or size press.
As a cellulosic fibrous sheet material, a corrugated medium and a linerboard material having incorporated therein at the wet press or size press from about 5 to 30 percent by weight of waste sulfite liquor, said waste sulfite liquor having been neutralized with sodium aluminate to a pH of 6.5 to 8, and reacidified with alum prior to addition to said medium.
Dependencies are inferred from the claim text.