The advanced method used in the world is the full-flow hydraulic headbox equipped with a sandwich former and a pressure sizing cylinder former, etc., using the principle of fluid mechanics to disperse fibers, and the principle of double-sided dewatering to solve the problem of high-speed forming and two-sided paper. ; Use multi-layer forming arrangement to produce thin-page high-quality paper. In terms of pressing, in order to improve the dehydration efficiency, improve the paper's two-sided difference, curling and surface strength, the commonly used new technologies include high-line pressing, double-sided pressing, new transfer pressing, compound pressing and wide-nip pressing. The new paper machines and board machines all use fully enclosed steam hoods, dry nets and bag ventilation devices; high-end paper machines use new methods such as air cushion drying.
The development of coating technology includes the development of new coatings, coating preparation technology and equipment research. The applicator tends to adapt to the multifunctional form of high-speed production, compact coating and wide coating range. The emerging form of dryer has attracted the attention of the industry due to its high thermal efficiency. The latest coating machines include Sweden's Twin-HSM Roll Coater and ABC Coater. Its characteristic is that the coating amount is easy to adjust, and the coating amount has a large range.
