Screwdriving Torques in Particleboards


  • Xiaohong Yu
  • Onder Tor
  • Franklin Quin
  • Dan Seale
  • Jilei Zhang


Characteristics of torques for driving screws into particleboards were investigated in this study. Factors evaluated on screw seating and stripping torques (SET and STT) were pilot-hole diameter, embedded screw orientation, and particleboard (PB) material physical and mechanical properties such as material core density, particle size, and internal bond (IB) strength. Recorded torque–time curves, which illustrate the complete process of driving screws into PB materials, indicated that screw torques behave similarly in sides and faces of PB and that the whole screwdriving process can be described as a two-phase process. PB materials evaluated in this study had mean SET from 0.66 to 1.94 N-m, STT from 2.03 to 6.51 N-m, and STT-to-SET ratios from 2.5 to 5.0. Statistical analyses indicated that the SET and STT of driving screws into PB faces were significantly greater than their corresponding values into PB edges. The SET and STT in PB materials with pilot holes were lower than their corresponding ones without pilot holes. SET and STT values can be estimated using power equations including PB material core density and particle length and IB strength.






Research Contributions