Since May, the price of base paper has been rising, rising twice in a week, which is equivalent to the price of masks during the epidemic. What caused the paper price to rise?
As a country that invented papermaking, its technology will not be affected. The problem lies in raw materials. There are three main sources of papermaking, namely wood pulp, non-wood pulp and waste paper pulp. Wood pulp is mainly used as living and cultural paper, waste paper pulp is more used as wrapping paper, and non-wood pulp is the raw material of non-living paper.
Quality evaluation:
The quality of pulp mainly depends on its fiber shape and fiber purity. The performance of these two aspects mainly depends on the variety of raw materials used, manufacturing methods and processing depth.
In terms of fiber morphology, it mainly includes the average length of fiber, the ratio of fiber cell wall thickness to cell diameter, and the content of non-fiber miscellaneous cells and fiber bundles in pulp.
Generally, the average fiber length is large, the ratio of cell wall thickness to cell diameter is small, and there are few or no non-fiber mixed cells and fiber bundles. It has good bonding strength, dewatering and papermaking performance, and can produce stronger paper, which belongs to higher-grade pulp, such as spruce softwood pulp and cotton pulp.
Above content reference: Baidu Encyclopedia-Pulp