On the basis of pre-processing of knitted fabric printing semi-products, in order to meet the printing requirements and ensure the quality of products and the smooth progress of production, according to the summary of production practice, the following work should be generally carried out.
⑴ prepress tenter setting
In order to improve the flatness of the semi-finished product to be printed and the dimensional stability of the semi-finished product. Do the pulping and trimming.
(2) Weft adjustment before printing
Weft-biased fabric semi-products will form weft-bias defects after printing, which cannot be repaired. In order to prevent the occurrence of weft faults in knitted fabrics, weft must be adjusted before printing.
(3) Imprint embryo whitening
Polyester whitening of polyester knitted fabrics should be carried out on a tenter setting machine. The whitening of cotton, nylon and acrylic fibers can be carried out in an overflow dyeing machine or dyeing vat by dipping method.
⑷ on the antistatic agent
Synthetic fiber knitted fabrics will generate static electricity, absorb dust, and absorb dyes and other defects during processing, so antistatic agents should be used to overcome them. The antistatic agent can be finished on the tenter setting machine. The electrostatic agent on polyester knitted fabrics can be dried by padding and drying in the same bath with polyester whitening.
⑸ Embryo sizing
For some light and wrinkle-prone knitted fabrics, sizing is required to increase the body of the knitted fabric and facilitate printing.
⑹ Printing embryo dyeing bottom
For some patterns that need to be dyed, the knitted fabric semi-finished products should be dyed before printing. The dyeing process and operation are basically the same as the knitted fabric dyeing process.
⑦ Rolling of the printed embryo is to ensure the uniformity of the fabric feeding tension. For the light and thin knitted fabrics such as satin, chiffon, silk and other fabrics with easy movement of the yarn, they are rolled before printing to facilitate the feeding.