Views: 0 Author: Site Editor Publish Time: 2026-09-20 Origin: Site
In actual cast‑film production, even with stable equipment operation, defects such as insufficient surface gloss and reduced clarity may occur, failing to achieve the required mirror‑finish effect. Troubleshooting and resolving such issues directly tests both cast‑film machine quality and operators’ process know‑how. Drawing on practical experience, Nanjing sumino Precision Machinery Co., Ltd. has summarized a systematic set of inspection and solution procedures.
Chill Roll Surface Inspection: The First Gate for Mirror‑Finish Performance
The chill‑roll surface acts as the “mold” for mirror‑finish films. When films show high haze or rough surfaces. Typical faults include residual contaminants left uncleaned, hard‑object scratches, and worn‑out roll plating. Only copper blades or dedicated cleaning tools shall be used for roll‑surface cleaning; hard steel scrapers are forbidden to avoid surface scratching. Machine quality is reflected in roll‑surface wear resistance and anti‑scratch performance. Premium roll surfaces can greatly extend the service life of mirror‑finish performance.
Thermal System Inspection: Critical Variables for Mirror‑Finish Results
Both excessively high and low chill‑roll temperatures impair mirror quality. At overly high temperatures, poor film release occurs and transverse streaks tend to form on film surfaces. At overly low temperatures, surface gloss drops and hazy appearance emerges. Verify accuracy of temperature sensors in each zone, smoothness of cooling‑water circulation, and uniformity of zoned temperature control. Machine quality manifests in precision and response speed of the thermal‑control system. High‑grade temperature control keeps roll‑surface temperature difference within a very narrow range.
Air Knife & Cooling‑Condition Inspection: Environmental Factors for Mirror Finish
Air‑knife air pressure and angle directly determine how tightly melt adheres to the chill roll. Excessive air pressure may blow the molten web apart; insufficient pressure leads to incomplete contact. In addition, workshop cleanliness and airflow stability also influence mirror‑finish quality. Check sequentially for carbon deposits at air‑knife nozzles, proper pressure settings, and stable production‑site conditions.
Process Parameter & Raw‑Material Inspection: Systematic Factors for Mirror‑Finish Performance
Over‑high melt temperature brings inadequate cooling. Impurities or moisture inside raw materials will trigger surface defects. Confirm that temperature settings for each barrel zone stay within the material processing window and raw materials are fully dried. Nanjing sumino Precision provides process diagnosis and optimization services for customers to restore mirror‑finish quality, enabling well‑built cast‑film machines to continuously generate value during stable production.
