Abstract: There are many complex factors influencing shrinking effect of rubber blanket preshrinking machine in preshrinking processes of dyeing and finishing. It is very difficult to realize online prediction of shrinkage and formulate preshrinking technology accurately and quantitatively. Based on the shrinking mechanism and analysis of deformation of the rubber blanket, the soft sensor model of relationship between shrinkage and extrusion pressure which is the biggest impact factor is built. The result of the application indicates that the relative errors of shrinkage calculated by the soft sensor model are all less than 8%, and the mean absolute percentage error is 5.101% . The model is available and efficient. It will have sure directive significance of online prediction of shrinkage and designing preshrinking technology accurately and quantitatively.

Key words: dyeing and finishing , finishing , shrinkage , soft sensor , rubber elasticity , extrusion pressure