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US 4,391,670 AGranted
Low energy TMP furnish of improved strength by ozonation and press drying
AssigneeInternational Paper Company
InventorRichard B. Phillips
Life of this patent
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Abstract
Press dried paper sheets from certain ozonated high yield pulps are disclosed. Such sheets show substantially improved strength over comparable sheets prepared from non-ozonated pulps and over non-press dried sheets from ozonated pulps.
Claims11
A process for the preparation of linerboard from thermomechanical, high temperature mechanical and semichemical mechanical pulps comprising:
- (a) treating mechanical pulp selected from thermomechanical, semi-chemical mechanical, high temperature mechanical, or mixtures thereof with ozone;
- (b) forming a sheet having from about 30% to about 60% consistency from the ozone treated pulp of step a above;
- and
- (c) press drying the sheet formed in step b above at high temperatures and pressure until at least about 10% to about 15% moisture content is attained.
1 more element
Dependencies are inferred from the claim text.