1960 Volume 16 Issue 12 Pages 1009-1013
In the previous report, the compressional pressure-deformation curves of various carded fibre masses and blankets were measured. And they were analysed by the model which consists of m springs in series and the n serial springs in parallel, where n and m depend on deformation x. In this report, considering the rheological character of bended fibres and the frictions between them, the compressional recovery is discussed. It is defined as
The result of analysis of pressure deformation curve drives the following equation, where n1 and n2 are n and k1 and k2 are k in 1st and 2nd compression respectively, and θ_??_2 or 3. k is the coefficient of bending fibre's rigidity. The entanglements of fibres in the 1st compression cause the increase of n, from n1 to n2. Assuming a relation between the mean bending force of the fibres and the forces of entanglement points, the number of entanglements in the 1st compression is related to the rheological properties of bending fibres and the distribution of maximum entanglement forces which correspond to static friction force ceofficient.