TEMPO Oxidized Thermomechanical Pulp Used as a Paper Reinforcement, 2016 International Mechanical Pulping (IMPC) Conference

Thermomechanical pulp (TMP) was oxidized with 4-acetamido-TEMPO to a content of 400 mmol/kg in carboxylic groups in order to increase interfibers bonding potential. A fiber classification shows that the long fibers papers are twice stronger after oxidation. With an industrial fractionation process, two main fractions are produced, long R48 and short P48. Oxidized R48 mix with untreated P48 have better strength than the whole oxidized pulp. To investigate Kraft replacement in a TMP based paper grade with oxidized TMP, the Kraft pulp was replaced up to 30% without changing the proportion of non-oxidized TMP (70%). Two-thirds of the Kraft can be replace with low impact on the paper strength (loss of 20 to 30% in tear and tensile). The TEMPO oxidation can also achieve high carboxylic groups content (1500 mmol/kg) which when is mixed with low oxidized pulp to replace the whole Kraft, as shown a decrease of strength between 15 and 30%. In addition, a mineral filler retention analysis was done between two pulp: one with 70% of non-oxidized and 30% of highly oxidized TMP, the second with 100% non-oxidized TMP. The results showed a twice better retention for the mixed pulp, thus showing another potential benefit of TEMPO oxidized TMP in common mechanical grade papers.

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