Shandong Zhongyang Chemical Co., Ltd.
High-end whitening solution for PP woven bags
Release time:
2026-01-14
A large plastic products manufacturer, specializing in PP woven bags, primarily uses them for chemical raw material packaging and agricultural product logistics.
I. Case Background
A large plastic products manufacturer, specializing in PP woven bags, primarily uses them for chemical raw material packaging and agricultural product logistics. These products have extremely stringent market standards regarding whiteness, color uniformity, and outdoor weather resistance. Before introducing a new whitening solution, the company faced three major pain points:
1. Uneven Whitening: Finished bags often exhibit localized graying or color gaps, severely impacting the brand's premium image.
2. Poor Yellowing Resistance: After outdoor exposure or long-term storage, the whiteness value rapidly decreases, and yellowing becomes noticeable.
3. Cost and Process: Traditional whitening agents require high dosages and are prone to issues such as exudation and bag sticking, resulting in low yield rates.
II. Solution and Application Process
To address the characteristics of high-temperature extrusion and blown film molding processes, a high-performance benzoxazole-based fluorescent whitening agent was introduced, and a compounding optimization scheme was developed:
1. Product Selection: A customized high-purity fluorescent whitening agent with excellent thermal stability, capable of withstanding temperatures above 280℃, perfectly suited to the processing characteristics of PP material. 2. Precise Proportioning: The addition amount is determined to be 0.03%-0.05% based on the product thickness (50-80μm), reducing usage costs by more than 30% compared to traditional products.
3. Process Flow: The whitening agent is mixed evenly with PP raw materials in a specific ratio, and then processed through extrusion, blown film, weaving, and setting. Only the mixing time needs to be extended during the mixing stage to ensure the whitening agent is evenly dispersed in all directions. No modification to existing production equipment is required, achieving seamless integration.
III. Application Effects and Value
After implementation, the company achieves a dual breakthrough in quality and cost:
1. Appearance Upgrade: The whiteness value of the finished product increases by more than 25%, with a pure and bright surface color, completely eliminating local color difference issues and meeting the stringent standards of the high-end packaging market.
2. Stable Performance: After outdoor exposure testing, under 300 hours of UV irradiation, the whiteness retention rate reaches 92%, far exceeding the industry average, significantly improving product durability.
3. Cost Reduction and Efficiency Improvement: The dosage is significantly reduced, and combined with the characteristics of no precipitation and low bag adhesion, the product qualification rate increases from 95% to 99.8%, resulting in significant annual production cost savings.
IV. Case Highlights
This case study focuses on "customized compounding + full-process service," precisely addressing the common pain points of the plastic woven bag industry: "uneven whitening, poor weather resistance, and high cost," showcasing the application value of high-end fluorescent whitening agents in the industrial field.
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