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Stable bulk density is an important basic indicator to balance paper thickness, weight and hand feel. Many paper mills face unstable bulk density in mass production, resulting in inconsistent thickness of the same gram weight paper, fluctuating fluffy hand feel and unbalanced compression resistance. Unstable bulk density will cause great trouble to customer's fixed-specification procurement and automated processing. Too high bulk density leads to loose structure and insufficient strength, while too low bulk makes hard hand feel, poor air permeability and increased raw material consumption. It has always been a difficult technical problem for the paper industry to realize precise and stable bulk density control. Shandong Ludao Energy Technology Co., Ltd. provides professional paper bulk density stabilization solutions. By scientifically adjusting fiber gap structure and adopting bulk balancing auxiliaries, we precisely fix the bulk density range of finished paper, ensure consistent thickness, hand feel and structural compactness of batch products. The technology perfectly balances paper fluffiness, strength and air permeability, avoids quality deviation caused by bulk fluctuation, and helps enterprises realize standardized fixed-specification production and stable market delivery.