Reasons for wind marks on fabrics
Wind mark is a kind of color noise produced during the drying and storage process of fabric after printing, dyeing and finishing. Compared with the normally painted areas, the wind-stamped areas will show white or darker gray strips in almost all directions. This kind of noise is not visible before finalization, but will appear after finalization. So this is basically a fabric man’s nightmare.
The reasons for this situation are as follows: in the case of continuous production of fabrics, it is generally not easy to produce wind marks, while in intermittent production, due to sudden high temperature and high pressure, wind marks will occur all at once. If you don’t pay attention, wind seals will appear. Among them, wind marks on polyester fabrics mostly occur after the fabric is dehydrated and opened, before setting, or during the reciprocating folding marks when the fabric is stored in the stacking truck. In severe cases, there will be almost ten wind marks in the latitudinal direction, and their spacing will be exactly the spacing between the natural cotton cloth being folded back and forth.
Generally speaking, sizing fabrics are easy to produce wind marks. There are too many reasons. The editor will not go into details here, but why do sizing-free fabrics still have wind marks? Woolen cloth? The reasons are as follows: During the process of placing the fabric after opening, the reciprocating folds are exposed to the air, and the flow of air causes the moisture in these parts to evaporate and dry first. Due to the capillary effect, free water in other parts will flow towards the reciprocating folds. However, antistatic agents, lubricants added during spinning and weaving, and leveling agents and cleaning agents added during post-coloring processing will still have a small amount remaining in the fabric and the free water carried by the fabric. Among these additives Most are non-ionic additives. Similar to the principle of dye migration, when free water flows to the reciprocating folding point, the residual additives dissolved in the free water also flow to the reciprocating folding point.
Wind-printed fabric
As the moisture further evaporates, the concentration of additives in the reciprocating folds will be much greater than in other areas. parts. During the high-temperature setting process, the thermal migration of disperse dyes produced in some reciprocating folding parts will be significantly greater than in other parts. The reason for the thermal migration of disperse dyes is that the solvent in the outer layer of the fiber can dissolve at high temperatures. The dye migrates from the inside of the fiber through the fiber tubules to the surface of the fiber, causing the dye to accumulate and form on the surface of the fiber, causing a series of effects. Such as color change, friction, washing, sweat stains, dry cleaning, light fastness, etc., the dyeing fastness decreases rapidly. But the fatal effect is the serious color difference between the reciprocating folds and other normal parts, that is, the wind mark.
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