Smile mask. The mask machine produces various masks with certain filtering performance through hot pressing, folding molding, ultrasonic welding, waste removal, ear-strap nose welding and other processes. Among them, the machine mask is called the smile mask. After wearing it, the waiter can not only play the role of an ordinary mask, but also breathe normally and smoothly. At the same time, customers can also see the smiling expression of the waiter.