Roll-to-roll coating is widely used in the production of PET metallized film, BOPP packaging film, metallized capacitor film, and optical decorative film. The flexible film substrate itself readily absorbs water molecules from the air. After entering the vacuum chamber, it continuously releases gas, with moisture accounting for 65%-95% of the residual gas in the chamber. This is the number one hidden problem restricting production capacity and reducing yield.
Relying solely on molecular pumps and diffusion pumps for vacuuming presents four major production challenges due to moisture: 1) Significantly longer vacuuming cycles: Achieving a process vacuum of 10⁻⁴Pa on a wide-width winding machine takes 35-45 minutes, resulting in long equipment downtime and hindering capacity increases. 2) Moisture reacts with aluminum and silicon oxide vapor-deposited materials, causing color differences, pitting, delamination, and numerous pinholes in capacitor films, leading to batch scrap. 3) Moisture exacerbates target oxidation and induces backflow of oil vapor from the diffusion pump, resulting in oil stains on the substrate and significantly increasing the consumption of film and target materials. 4) Repeated moisture absorption and release within the cavity leads to unstable vacuum partial pressure across batches, causing evaporation rate drift, exceeding film thickness tolerances, and compromising the pass rate for high-end orders.
Traditional solutions each have shortcomings: cavity baking only removes surface moisture and cannot handle continuous moisture release from the cavity; liquid nitrogen cold traps have high consumable costs and pose low-temperature safety hazards. Xieyi's moisture trap pump utilizes mechanical deep-cooling sublimation technology to specifically address the moisture problem in winding coating.
Post time: 2026-07-04 13:47:25