纸业巨头发布第四轮涨价函

Group 1 - The core point of the article is that Nine Dragons Paper has announced a price increase for corrugated paper and recycled kraft paper, effective from August 1, with an increase of 30 yuan per ton [1] - This marks the fourth price increase notice issued by the company, following previous announcements on July 1, July 10, and July 12 [1] - The ongoing price adjustments indicate a trend in the paper industry towards increasing costs, potentially impacting supply chain dynamics and pricing strategies [1]