STUDY OF EXTRUSIVE CHEMICAL THERMOMECHANICAL PULP
UDC 676.153.6
Abstract
The article presents the results of a study of extrusive chemical-thermomechanical pulp (ECTMP) from bleached poplar wood. As a result of the study, it was established:
Microscopic studies of the ECTMP fiber confirm the mechanism of predominant fibrillation of wood along the S layer.
The medium- and long-fiber fraction of ECTMP is 85–80%, with a grinding degree of 24–43°. This fact confirms the small shortening of the fiber with an increase in the degree of grinding by more than 20°.
For use in the composition of paper and cardboard, it is recommended to grind ECTMM to the limits of 35–45°.
Freezing ECTMP, like drying, reduce physical and mechanical properties within 10-15%. It is recommended, if possible, to recycle ECTMP immediately after receipt, without drying or freezing.
ECTMP is a pulp and paper fibrous semi-finished product suitable for use in the composition of many types of paper and cardboard.
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