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The significance of a recently developed system that measures dynamic forces experienced by individual needles during formation of needlepunched fabrics is demonstrated. The system design, coupled with a new signal analysis technique allows measurement of peak penetration and stripping forces as well as the penetration and stripping energies due to needle/fiberweb interaction. Systematic experimental investigations were conducted to determine the critical locations in the needle board where needles experience the highest forces, and correlate needle force parameters to fabric performance.    The research results, supported by statistical analysis, show there is a strong relationship between needle penetration energy and fabric properties. Additionally, the needling density significantly impacts the location of maximum penetration forces.

Applications of On-Line Monitoring of dynamic Forces Experienced by Needles during Formation of Needled Fabrics