Windprint, which is a kind of dyeing noise produced by the fabric after printing and dyeing. Compared with the normal dyed blank, the place where the wind prints will appear white or dark gray light strips in almost all the width of the door. This type of noise is not visible until it is finalized and will be produced after shaping. So this is simply a nightmare for cloth people.
The reason for such a situation is as follows: in the case of continuous production of fabrics, wind printing is generally not easy to occur, and intermittent production, due to sudden high temperature and high pressure, causes accidental wind-printing. Among them, the wind-printing of polyester fabrics mostly occurs after the cloth is dehydrated and opened, before the setting, or when the stacker is stored. In severe cases, there will be almost ten wind marks in the latitudinal direction, and the spacing will be exactly the distance between the fabrics and the reciprocating folds.
Generally speaking, sizing fabrics are easy to produce wind prints. There are too many reasons. Xiaobian does not say much here, but why are there any wind-printing fabrics? The reasons are as follows: the layout of the fabrics is to be determined after opening. During the process, the reciprocating folds are exposed to the air, and the flow of air causes the moisture in these portions to first evaporate and dry. Free water from other parts of the capillary effect will flock to the reciprocating fold. However, there are still a small amount of antistatic agents, lubricants, leveling agents and detergents added during spinning and weaving, which remain in the free water carried by fabrics and fabrics, and most of these additives It is a non-ionic additive. As with the principle of dye migration, when free water surges toward the reciprocating fold, residual auxiliaries dissolved in free water also flock to the reciprocating fold.
Wind printed fabric
As the moisture is further volatilized, the concentration of the auxiliaries at the reciprocating fold will be much greater than other parts. During the high-temperature setting process, the thermal mobility of the disperse dye produced by some reciprocating folded parts is obviously greater than other parts. The reason for the thermal mobility of the disperse dye is that the solvent of the outer layer of the fiber can dissolve at a high temperature, and the dye migrates from the inside of the fiber through the fiber tube to the surface layer of the fiber, so that the dye is deposited on the surface of the fiber, causing a series of effects. Color fastness such as color change, friction, water washing, perspiration, dry cleaning, and light fastness decreased rapidly. But the most deadly effect is the severe color difference between the reciprocating fold and other normal parts, namely the wind print.