Far-infrared ray drying system applied to EL , Membrane Switch, Overlay embodied in its high-end cleanness and stable drying. To ensure economical space, the identical IR System and heating block were installed on the upper part and lower part. All air pass through the 1st free FILTER, and keep the cleanness of the final HEPA FILTER. Additionally, it represents more stable drying efficiency by the PID temperature control system which is ±3℃ and precise.