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The primary objective of refining is to develop sheet strength. The sheet must meet the customer's strength requirements and must be able to run on the tissue machine and converting equipment without breaking. Strength properties increase with refining due to improved bonding from fiber flexibility and external fibrillation. Although it has a positive impact on strength, too much refining can have a negative impact on desirable tissue attributes, such as bulk, absorbency, and softness. Therefore, refining must balance strength with the other sheet properties. Also in extreme cases, overrefining will damage the fibers and result in fiber cutting, fines generation, and poor strength development. This negatively effects machine runability, reduces drainage at the wet end which increases dry demands, and ultimately, reduces production rate.