Abstract:

In order to solve problem of low printing accuracy of digital printing for knitted polyester fabric, cationic modification agent, sodium alginate and polyvinyl alcohol were used to pretreat fabrics, respectively, and the influence of fabric structure, type and amount of pretreatment agents and baking conditions on printing accuracy were studied. The results show that fabric structure influences diffusion and bleeding of ink droplet on the fabric. The effective porosity of fabrics is higher, the diffusion area of ink droplet on the fabric is smaller, which illustrated that fabric wettability and capillary effect of fibre or yarn are poor. A certain linear correlation exists among diffusion distance of ink droplet on the fabric, printed actual line width and the effective porosity of fabrics. Cationic modification agent pretreated fabric has the best printing accuracy compared with that of sodium alginate and polyvinyl alcohol pretreated fabric. The printing accuracy is optimum when the baking temperature is 200 ℃ and baking time is 1 min.

Key words: knitted polyester fabric, printing accuracy, fabric structure, baking condition