Overview
Cold rolling oil filter paper is an engineered nonwoven material designed for continuous filtration in metal cold rolling operations. It serves as a critical component in oil circulation systems, protecting precision rollers and bearings from abrasive wear. The paper's multilayered structure combines depth filtration with surface capture mechanisms. Developed specifically for the steel industry, these filters operate under high-pressure conditions (up to 20 bar) while maintaining consistent flow rates. They are compatible with mineral oils, synthetic esters, and water-soluble coolants commonly used in tandem and cluster rolling mills.
Structure and Working Principle
The filter paper employs a gradient density construction, with coarse outer layers trapping large contaminants (≥50µm) and finer inner layers capturing microparticles. Synthetic resin impregnation provides wet strength retention, preventing fiber shedding during pulsating oil flows. Filtration occurs through three mechanisms: direct interception of particles larger than pore sizes, inertial impaction for high-density contaminants, and adsorption of sub-micron particles via electrostatic charges. The paper's porosity (typically 60–70%) balances filtration efficiency with acceptable pressure drop.
Key Features
Thermal resistance allows operation in oil temperatures up to 120°C without degradation. The material exhibits ≤1% extractables to prevent secondary contamination. Acid-alkali resistance (pH 5–10) ensures compatibility with various rolling oil formulations. Advanced variants incorporate glass microfibers for enhanced particle retention or activated carbon layers for dissolved contaminant removal. Standard widths range from 600mm to 2m for compatibility with industrial filter presses.
Application Areas
Primarily used in cold rolling mills producing stainless steel, aluminum foil, and automotive-grade steel strips. Specific applications include backup roll bearing lubrication systems, work roll cooling oil circuits, and hydraulic power units. Secondary uses involve filtration in metal stamping operations and wire drawing processes where oil cleanliness directly impacts surface finish quality. Some food-grade packaging material manufacturers adopt similar filtration papers for edible oil processing.
Maintenance and Precautions
Monitor differential pressure gauges; replace when reaching 80% of manufacturer's maximum rating (usually 3–4 bar). Avoid dry running to prevent fiber damage. Store rolls in climate-controlled environments (15–30°C, RH <60%) to prevent moisture absorption. Dispose of spent filters as hazardous waste due to metal content. For extended service life, implement pre-filtration with mesh screens to remove gross contaminants before the paper stage.
B2B Procurement Guide
Request certified test reports for ISO 4548-12 (multi-pass test) and ISO 19438 (filterability index). Verify compatibility with your oil type – ester-based oils may require synthetic media instead of cellulose. Leading manufacturers include Lydall, Hollingsworth & Vose, and Ahlstrom-Munksjö. For just-in-time supply, consider regional stocking distributors with cutting services to provide custom widths. Bulk purchases (≥5,000m²) typically attract 15–25% discounts. Sample evaluation should include 48-hour immersion tests to check for media delamination.
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