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The tensioning system is responsible for keeping the forming fabric tension constant on the Fourdrinier. Fabric tension is important because it impacts fabric wear, dewatering, and sheet formation. If fabric tension is not monitored and kept close to its recommended setting, there are undesirable consequences. Relatively high tension is desirable because it improves drainage. However, excessive wire tension actually reduces the size of the openings in the wire mesh and restricts water drainage. Poor drainage during sheet formation can lead to holes and other defects in the sheet.