Shandong Zhongyang Chemical Co., Ltd.
High-efficiency whitening and environmentally friendly optimization solutions for cultural paper
Release time:
2026-04-20
A large cultural paper manufacturer with an annual output exceeding 500,000 tons mainly produces office consumables such as copy paper and writing paper. With market upgrades, customers are increasingly demanding higher standards for paper whiteness, smoothness, and environmental protection. Previously used ordinary whitening agents faced the following bottlenecks:
High-Efficiency Whitening and Environmental Optimization Solution for Cultural Paper
I. Case Background
A large cultural paper manufacturer with an annual output exceeding 500,000 tons mainly produces office consumables such as copy paper and writing paper. With market upgrades, customers are increasingly demanding higher standards for paper whiteness, smoothness, and environmental protection. Previously used ordinary whitening agents faced the following bottlenecks:
1. Low Efficiency: To achieve the target whiteness (≥90%), the pulp addition amount needed was as high as 0.15% or more, resulting in high raw material costs.
2. Compatibility Risks: Poor compatibility with commonly used pulp additives such as starch and CMC, easily causing paper defects such as spots and translucency, affecting smoothness.
3. Compliance Risks: The free aniline content in the product was close to the upper limit, making it difficult to meet increasingly stringent environmental testing standards.
II. Solution and Application Process A paper-specific tetrasulfonic acid fluorescent whitening agent is selected to construct a multi-stage whitening system:
1. Product Characteristics: High-purity anionic whitening agent with extremely strong affinity for pulp fibers. The free aniline content is far below national standards, and it has fully passed ISO environmental system certification.
2. Compounding Process:
Internal Sizing: The addition amount is reduced to 0.08%, reducing costs by nearly half compared to traditional methods.
Surface Sizing: A 0.02% addition is used to further improve whiteness uniformity.
Operation Procedure: The whitening agent is diluted with warm water and then added to a mixing tank for uniform dispersion; or it is mixed with the sizing solution in the surface sizing stage, coated using a sizing machine, and then dried and calendered. The process is simple and easy to operate.
III. Application Effects and Value
After implementation, product quality and market competitiveness have significantly improved:
1. Leap in Whiteness: The whiteness of the finished paper jumped from 82% to 93%, with a smooth, bright surface free of impurities, perfectly meeting the needs of high-end office paper and increasing product premium.
2. Quality Control: The incidence of paper defects decreased by 12%, and the pass rate increased to 99.2%, significantly reducing waste.
3. Environmental Compliance: The content of harmful substances such as free aniline fully met standards, successfully passing various environmental spot checks, laying a solid foundation for the company's long-term sustainable development.
IV. Case Highlights
Focusing on the three core needs of the paper industry—"quality improvement, cost reduction, and environmental protection"—this case study achieved a breakthrough in whiteness indicators and reduced production costs by using a specialized whitening agent and optimizing the formula. It serves as a model solution for the transformation and upgrading of traditional paper manufacturing enterprises.
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Qihe Economic Development Zone (Industrial Park), Shandong Province