What are the causes of wrinkles in dip dye knitwears?
Why do dip dye knitwears produce wrinkles during dip dyeing? What is the cause of this phenomenon? Let's take a look together.
1. The mechanism of wrinkle generation in dip dye knitwears
Cotton fiber is a highly absorbent fiber. It has the characteristic of wet deformation, and cotton knitted fabric made of cotton fiber has this characteristic. Most of the dyeing and finishing of dip-dyed knitwear are dyeing and finishing processes in a wet state. The grey fabric will inevitably have some vertical elongation and lateral contraction mechanically: folding phenomenon will occur in the layout of the blank. A certain period of external force deforms the local fiber creases, forming creases; the gray cloth runs in the dyeing machine under the action of mechanical force and moves with the dyeing liquid. There must be wrinkled areas in the cylinder. And the fabric is continuously lifted in the dyeing machine, moving and crease cycle. If the crease time is longer, the crease is easier to repair because the fabric will return to the folded area after a week. If the dip-dyed knitwear lacks the necessary elasticity, it is likely to bend again in the old position. After lifting the fabric in the dyeing machine, the stretchable distance is very short. When the cycle is repeated multiple times, it is easier to repair the wrinkles. In addition, it should be noted that if the dip-dyed knitwear is in a high temperature state, the drainage will quickly enter the normal temperature water. Then, the fabric in the folded state is rapidly cooled, and the folding in the high temperature stage is retained. If there is no strong processing condition in the subsequent processing. It is difficult to restore it to level so that wrinkles and deformations are fixed and retained on the final product.
2. Factors in the variety of dip dye knitwears
In addition to the characteristics of the equipment dyeing method, the type of dip-dyed knitwear is also another influencing factor, especially those high-count and high-density fabrics, such as compact cotton combed. Due to the large number of fibers, the corresponding high density and high weaving tension, Dayuan woven sweatshirts, outerwear fabrics and elastic fabrics reduce the freedom of movement between the fibers. The smaller the space for free movement, the smoother the cloth surface, the clearer the texture, and the more obvious the reflection of wrinkles. Generally, loose mesh, degreased cotton weft knitted fabrics and most warp knitted fabrics basically do not cause wrinkle problems.
3. The problem of dip dye Knitwears production plan
The rationalization of the cylinder row problem planned in the production plan is not only related to the color and color difference problems, but also to the wrinkle printing problem, especially the large-volume dyeing machine. If the arrangement is improper, color difference will also occur. If the arranging staff is not clear about the characteristics of each specific machine, regardless of the type, structural characteristics and customer requirements of the dip dye knitwears fabric, they just blindly pursue unit production, and the gray fabric on the row is too long, if the fabric is too long and heavier The fabric will be folded in the dyeing machine, and the area of decolorizing agent used in printing and dyeing wastewater will be larger. The degree of self-pressure is also more serious, leading to a corresponding increase in the storage time of crease printing. The longer the time, the greater the possibility of forming dead marks.