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Deinked Pulps, Wet-end Chemistry

UST’s Manager: Bruno CARRE

Objectives

Increase the use of deinked pulps in various grades of papers through better control of their variability and improve the performances of the wet-end chemistry though better control of the physico-chemistry of the papermaking circuits.

Competences

Deinking process and deinked pulp, Wet-end physico-chemistry, (Drainage, Retention, Sizing, Sheet formation).
Consultancy and expertise: assessments of stickies and surfactants, diagnoses and optimisation of water circuits and wet-end, assessment of chemical efficiency (Drainage, Retention, Sizing, Antifoam…) improvement in sheet-formation, comparison of raw materials and other various materials, modelization of industrial lines: stock preparation to papermachine  …

Activity

The endeavour of the UST7 team is to improve quality and to reduce the variability of the deinked pulps in order to increase their use in all grades of paper particularly in those likely to incorporate them more. This implies to acquire a better knowledge (i) of DIP components, (ii) of their variability, (iii) of the incidence of the DIP particularities on manufacturing, printability and the possible converting of the finished product. Finally, the changes in regulations or new environmental constraints are also taken into consideration through prospective studies.
Subjects are focussing, with all types of pulps, on a better control of the paper circuit physico-chemistry in order to improve the productivity and the runnability of the paper machine, and finally to confer certain usage properties (optical characteristic, sizing, wet-end resistance, dry resistance …).

Materials

• Deinking lab (Pulpers – Flotation Cells – Laboratory washer – Lab screens (Sommerville, Mac Net…) - Hyperwashing).
• Deinking pilot enabling the simulation of all industrial lines.
• Physico-chemistry lab (Dissolved matters, Distribution of colloid sizes (1 nm to 1µm) and fine elements (1 µm to 300 µm),  Zeta potential (colloids and fibre suspensions), Surface tension, Deposit tests, Analysis of stickies…, Microquartz scales.
• Wet-end chemistry lab (physico-chemical retention (Britt Jar), Retention handsheet, Dynamic handsheet, Drainage kinetics (DFS), CSF, Shopper, Static and dynamic contact angle, Flocculation bench, Sheet-formation analyser, Pulp air ratio measurement …