COMPRESSIONAL RESILIENCE OF BLANKETS AND CARDED FIBRE MASS

In the previous paper the pressure-deformation of fibre mass is discussed, and its theoretical equation is derived. Here this theory is applied to the detailed analysis of the pressure-deformation of the blanket.The result of the experiments on the pressure-deformation curves of blanket leads to the following equation: whereWhen of the first paper is replace by the above equation may be derived in the same way. n is the number of fibre's elements which sustain the compressional pressure P.ξo, _??_ are constants. As the result of compressional relaxation tests, it is found that the average strain (ε) of bended fibre's elements in blankets which is pressumed from the compressional relaxation characters, decreases at first and then increases with increased pressure. The minimum point of ε is at P_??_20_??_70g/cm2. This phenomenon may be explained theoretically ξo varies fromThis fact shows that there are two steps in the process of the compression and therefore the parameters N, t in these two steps differ from each other, although phenomenally the deformation curve is approximated by the above equation.