The moisture of greypaperboard occasionally appearshumidity is too big, hardness is not enough. So, what cause to cardboard hardness logistics index difference even we use the same raw materials, the same machine, the same production process?

1. Machinery, the hardness of paperboard is mainly influenced by breaking strength of the index of an equipment.

2. Raw materials, high percentage of water content directly impact on the hardness index of paperboard,whenever customer require for the hardness of paperboard, we would test the physical index of raw material by machine in advance whether can meet a criterion.

3. The method of operation during production, in the production process, the biggest factor to affect the paperboard quality is wrong operation method. For example, the tension adjustment is too big, the drying temperature does not reach the standard on time, then will destroy the paper fiber, and cause paperboard’s not enough rigidity in the mean while.