Abstract: The invention relates to the technical field of textile printing and dyeing, in particular to a method for preparing yarn with cloud dyeing effect; dyes with more than one color are mixed, and a small amount of dispersing agent is added, so that the pigment is not completely uniformly mixed, and the yarn obtained by extrusion molding of the pigment mixed spinning raw material has a randomly distributed multi-color cloud dyeing effect, and the cloud dyeing yarn with multi-color cloud dyeing effect is prepared, and compared with the cloth blank prepared by the traditional single-color yarn, the prepared cloth blank has a more three-dimensional pattern effect.

Abstract: A preparation method of a jacquard sandwich fabric with a surface inlaid with yarns in reverse is disclosed, employing double-needle bar sandwich warp knitting machine, comprising the following steps: 1) reversely inlaying yarns; 2) re-defining the basic stitch of the jacquard, designing two basic stitches; 3) designing patterns using color (16) and color (20) according to the actual fabric needs, and drawing; 4) directly raising a pattern through a jacquard guide bar; 5) converting the designed pattern into a graphic diagram, and continuously modifying the pattern through the graphic diagram; 6) after finishing the pattern design, producing the finished fabric product. The fabric only has two basic stitches, and when designing the jacquard pattern, only color (16) and color (20) are needed for drawing, thus reducing half of the basic stitch color and reducing at least half the design steps.