Fine Fiber Sheet Drying Method Preventing Wrinkles

The drying process is divided into multiple stages with different drying rates. The first drying stage uses a higher drying rate to remove bulk moisture efficiently, while the second drying stage uses a lower drying rate to prevent wrinkle formation on the sheet surface. This segmentation of the drying process resolves the contradiction between drying efficiency and surface quality.

The drying process employs periodic variation in drying conditions, alternating between high-intensity drying phases and low-intensity drying phases. This periodic action allows the sheet to adapt to drying stress, preventing wrinkle formation while maintaining overall drying efficiency.

The drying time is segmented into multiple stages with different rates. The first stage operates at a high drying rate to quickly remove the majority of moisture, reducing overall drying time. The second stage operates at a lower drying rate to carefully remove remaining moisture without causing surface wrinkles, thus resolving the time-quality contradiction.

The first drying stage performs preliminary moisture removal at high rate before the sheet structure becomes too rigid. This preliminary action prepares the sheet for the second stage where surface quality is prioritized, preventing wrinkles before they can form.

The drying process is segmented into two controllable stages with distinct drying rates. The first stage focuses on bulk moisture removal, while the second stage focuses on surface quality maintenance. This segmentation provides a practical balance between process complexity and wrinkle prevention effectiveness.

The drying rate parameter is changed between two distinct levels during the process. The first stage uses a higher drying rate parameter, while the second stage uses a lower drying rate parameter. This parameter change strategy enables wrinkle prevention without requiring overly complex process control.