Filters are used to remove particles that can detrimentally affect the quality of the paper or paperboard by creating defects or equipment variability that affects the paper's uniformity. Machines control the addition of additives, and they are not able to compensate if debris passes or if plugging occurs. Proper filtration minimizes wear in a system, thereby extending equipment life. It also reduces maintenance costs and helps the system sustain high levels of performance. By controlling the wet end, quality product is assured at the dry end and also controls the overall productivity of the process. Filtration removes oversized particles and debris from a variety of additive, this allows manufacturers to minimizeequipment plugging and improve the overall product quality. Spray Nozzle protection - unwanted and oversized particles block the inside of an orifice, which restricts water flow, no spray uniformity, and allows debris to pass through which ends up in the process or on product. The best time to remove particle is when the flow rates are the lowest and the particle size is largest. After dilution, flow rates are higher, which usually requires a larger filter system. The most common place for a filter to be located is just before the additive is used on the paper machine. Flow rate, media type, particle retention, and the characteristics of the additive will decide the type of filter to be used.
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