With the use of automated equipment such as dyeing computers and centralized dyeing control, the quality of printing and dyeing has been greatly improved compared to before. However, the impact of ...
With the use of automated equipment such as dyeing computers and centralized dyeing control, the quality of printing and dyeing has been greatly improved compared to before. However, the impact of the shaping process on the printing and dyeing quality cannot be ignored. Today, let’s talk about several styling parameters that affect color change.
Several styling parameters that affect color changes
The design of the styling process is set according to the state of the B/F fabric: width, weight, strength, and shrinkage. Among them, the following parameters have a greater impact on color changes.
A>. Temperature:
Resin: Dark color: 170℃; Light color (sensitive color): 150℃ However, resin: 150℃ Dry cloth: 130-160℃ is acceptable, subject to dryness of the cloth
The temperature of 100-150℃ has little effect on the color. When it is greater than 150℃, the higher the temperature, the greater the effect on the color.
B>. Speed:
Set according to fabric structure and thickness, generally:
170℃ 14M/MIN (gram weight greater than 250GM)
170℃ 16M/MIN (gram weight 200- 250GM)
170℃ 18M/MIN (Weight less than 200GM)
If the cloth surface does not dry during actual operation, first check whether the machine is normal; if so, first notify the person in charge of the process to slow down the machine speed and make changes to the process. Under the same temperature, keeping the cloth surface dry (0-6% moisture content) with a difference of 2-3M/MIN will have negligible impact on the cloth surface.
C>. Circulating air:
a>. Generally, Class II air is used to pass through the resin. The thermal efficiency is higher than Class I, and the impact on color is greater than Class I; b>. However, the resin is denser and has a thicker structure. Class II wind must be used; Class I wind can be used for looser and unstable fabrics. The final shape is subject to dryness of the cloth, and the impact on the color is negligible at the same temperature.
Several styling parameters that affect color changes
D>. Materials:
a>. Resin, catalyst and fiber react chemically and covalently combine, changing the molecular arrangement inside the fiber and affecting the color of the fabric. Changes have a greater impact; b>. The greater the weight of resin and catalyst, the greater the impact on color, otherwise the impact will be reduced; c>. The impact of soft oil on color is based on its own color and ionicity. Soft oil with a yellow appearance has a greater impact on the color of the cloth surface than soft oil with a clean and white appearance. Cationic soft oil (surfactant) has a greater impact on the color of the cloth surface than non-ionic soft oil.
In short, the higher the amount of resin and soft oil added to a finishing formula, the greater the impact on the color of the cloth surface; the smaller the amount of resin and soft oil, the smaller the impact on the color of the cloth surface. This is a priority to consider when designing the process.
E>. Door width:
When designing the shaping process, a more reasonable door width is determined based on the different fabric structures, the different needle numbers of the KN machine, and the influence of the PD cylinder type. The principle is to ensure that the fabric warp direction X weft direction Shrinkage is relatively average (e.g. 6×6%,7×7%) Post-finishing and trial-fitting personnel should check the post-finishing and shaping process before doing trial trimming to ensure that the door width meets the process requirements.
Otherwise, it will affect the visual judgment of the color checker, especially double-beaded, double-sided, rib, LYCRA rib, jacquard and other fabrics. Excessive door width difference will affect the color and light of the cloth surface.
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