THE SIMULATION OF THE GEOMETRY OF 2-COMPONENT YARNS - PART I - THE MECHANICS OF STRAND COMPRESSION - SIMULATING YARN CROSS-SECTION SHAPE

The geometry of two-components yarns is investigated, and a new approa ch is presented which addresses some of the limitations of other model s The model takes account of the compressional deformation of the indi vidual strands caused by transverse forces generated during the twisti ng process. The change in the cross-section takes account of the mecha nical properties of the strands and the observed changes in cross-sect ion shape caused by lateral compression. The outcome is a methodology and predictive equations for modelling the compressed shape of strands in two-component yarns; the model has been successfully used in CAD s ystems to simulate yam appearance.