Produces pulp for various insulating papers. Generally, it is sulfate wood pulp, cotton pulp, hemp pulp, etc. Depending on the type of paper produced, different characteristics are required, such as loose and porous, tough, long fibers, and high chemical purity. In order to increase its dielectric strength, softened water must be used during the production process to avoid introducing conductive metal ions.
Technology for producing bast fiber electrically insulating pulp by oxygen-alkali method
Application number/patent number: 92113515
The present invention involves using hemp bast fiber as raw material , using the oxygen-alkali method to produce electrically insulating pulp. The process includes cutting the raw materials, removing dust, feeding them into a pressure vessel, adding NaOH liquid and introducing oxygen, and performing an oxygen-alkali reaction under temperature and pressure to make a rough slurry; the rough slurry is cut into a semi-slurry machine, cut and beaten, and then screened and concentrated It enters the extraction system for chemical extraction and washing; and then undergoes continuous beating, magnetic iron removal, and fine screening to produce bast fiber electrically insulating pulp; this process can improve the mechanical, electrical insulation and thermal aging properties of the pulp, and reduce environmental pollution. Improve raw material utilization and reduce production costs.