Use of ozone for increasing the wet strength of paper and nonwoven
First Claim
1. Method of enhancing the wet strength of a fibrous cellulosic material, which comprises the following treatment sequence:
- subjecting the fibrous cellulosic material to an ozone treatment under acidic conditions to obtain an ozonated material; and
subjecting the ozonated material to an acidic wash of the ozonated material to obtain a fibrous cellulosic product having enhanced wet strength.
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Abstract
A treatment sequence includes ozonation under acidic conditions followed by an acidic wash for enhancing the wet strength of a cellulosic fibrous material. Preferably the ozone treatment and the acidic wash are followed by a second ozonation step under acidic conditions. The fibrous cellulosic material obtained by this treatment sequence has a breaking length of at least 100 m. The wet strength of the cellulosic fibrous material is increased without the use of additives, such as wet strength agents. This use of ozone is very simple and efficient, and leads to highly pure products. The use of ozone as the only treatment chemical in particular avoids the introduction of so-called “non-process elements” (NPE) into the treatment system, for instance metal oxides such as MgO, which are frequently used in the oxidative treatment of pulps.
13 Citations
30 Claims
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1. Method of enhancing the wet strength of a fibrous cellulosic material, which comprises the following treatment sequence:
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subjecting the fibrous cellulosic material to an ozone treatment under acidic conditions to obtain an ozonated material; and
subjecting the ozonated material to an acidic wash of the ozonated material to obtain a fibrous cellulosic product having enhanced wet strength. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification