When it comes to roll cooling we all know the objective is to find the perfect balance of heat in order to reduce flaws in your product but did you ever wonder if the reason for some of your flaws are due to a bad spray header design?
There are three main factors that when combined will provide you with a optimal spray header design which will lead to a high quality product and long roll life:
1: Precise Footprint Geometry - Effective and precise footprint geometry is the fundamental requirement to establish a homogeneous cooling application and is achieved by the configuration of a uniform cooling area on the work roll. This area is formed by the impingement of an array of adjacent sprays, equally spaced and positioned to assure consistent cooling intensity and impact pressure of the spray, transversely across the cooling area.
2: Symmetrical Coolant Application - Equal volume and uniform pressure through headers to top and bottom work rolls along with controlled coolant temperatures and cleanliness.
3: Header Geometry - The headers need to be positioned as close to the exit bite as possible. The exit bite is the location in which the highest work roll temperatures occur, so we want to attack and extract the heat before it has time to migrate to the center of the work roll. Difficulties are always present due to mill furniture and other hardware present. An effort needs to be made for positioning of the header.
Lechler offers engineered spray nozzles and thermal studies in order to help you achieve these three factors. Meet with one of our specialists today to see how we can improve the quality of your products