PROTECTING DEVICE FOR SPRAYING EQUIPMENT AND METHOD OF PROTECTING IT AND ITS SURROUNDINGS

摘要

A device for protecting a spraying equipment (8) and its surroundings in a paper or board machine, for applying a treatment medium onto a moving surface (3), comprises a protecting cover (11) having a space (12), which forms a single chamber in which the spraying equipment is located and which is open towards the moving surface in connection with an application zone, and two wall elements (13, 14) which extend cross to the machine direction on either side of the application zone, and define machine-wide gaps (24; 40 and 25; 26; 41, respectively) between themselves and the moving surface. According to the invention, the protecting cover has a sealing arrangement arranged in connection with said gaps for restricting passage of air and contaminations through the gaps in a controlled manner; a system for a controlled supply of capture air for capturing contaminations occurring within the space; and an evacuating system for a controlled, continuous evacuation of the capture air with contaminations from the chamber. The invention also relates to a method of protecting such a spraying equipment and its surroundings while using such a device.