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May 08, 2025
Industrial filter cloth plays a critical role in industries such as chemicals, food processing, and mining, with its performance directly impacting production efficiency and product quality. However, many companies struggle with filter cloth shrinkage, which not only reduces filtration precision but also causes compatibility issues with equipment. This article analyzes the causes of shrinkage and provides practical solutions.
Thermal Shrinkage:
When the operating temperature exceeds the material’s tolerance limit (e.g., polyester fibers above 150°C), molecular chains rearrange, leading to irreversible shrinkage.
Chemical Corrosion:
Strong acids and alkalis can break down fiber molecular structures. For instance, polypropylene degrades easily in concentrated acid environments.
Mechanical Fatigue:
Prolonged high-pressure filtration can cause deformation in the fibers, eventually reducing dimensional stability.
Improper Maintenance:
High-temperature drying (above 80°C) accelerates thermal shrinkage in synthetic fibers.
Incorrect Material Selection:
A common mistake is using standard polyester filter cloth in high-temperature environments.
Accurate Material Selection:
Use PTFE (resistant up to 260°C) for high-temperature conditions and PPS fiber for corrosive environments.
Process Optimization:
Install temperature monitoring devices in filtration systems to ensure operation within safe ranges.
Proper Maintenance:
Use warm water under 40°C for cleaning and avoid chlorine-based bleaching agents.
Pre-treatment Measures:
Apply a 5% pre-shrinking treatment (hot water soaking + mechanical stretching) before first use.
Lifespan Management:
Establish a usage log to track dimensional changes after each cleaning cycle.
By implementing a preventive maintenance system, the service life of filter cloth can be maximized. When shrinkage exceeds 5%, timely replacement is essential to avoid compromising product quality.
