World Class Quality Tunnel Type Rayon Filament Yarn Dryers with High Efficiency Heating Coils. These superior heat transfer coils are made to reduce utilities substantially, which pays back very shortly. Since Hot Water is the medium of heat transfer, the drying process becomes Baking Process, so that yellow tint on the Filament Yarn Cake is almost nil, Quality in terms of Sheen of the Filament Yarn shall be excellent.