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What is suede and the difficulty of dyeing process?

Views: 54     Author: Site Editor     Publish Time: 2021-07-05      Origin: Site


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Natural suede originally refers to animal suede leather, which is very similar to deer in length, but the suede leather is not the same as the suede usually seen, and there is no short and dense fluff.

This is because the skin and hair of the animal must be stripped off in the general process of leather processing, and only the grain surface layer and the meat surface layer are used. The muntjac is often active in the jungle, being injured by tree branches, rocks, and even other animals, resulting in more damage to the grain surface of the skin. If it is directly processed and used, the quality is poor, and it usually sands the surface layer to mask the abrasion. In order to obtain a better appearance, it is precisely because of this that a unique suede style is also obtained.


Over time, people like to call this suede processed leather "suede". As the suede belongs to the national second-class protected animal, natural suede is also replaced by deerskin, goat skin, sheep skin, pig skin, cowhide, and the style of suede leather is obtained through sanding grain surface layer. However, with the development of the times and the progress of the industry, the feel and appearance of imitated suede in the textile printing and dyeing industry have been quite similar to natural suede, and its surface texture is also similar to natural suede. After special finishing, it is fine. Flat, soft and plump, more durable than natural suede, and easier to maintain.


Dyeing process

Because the sea-island superfine fiber artificial leather is composed of superfine polyamide fiber and polyurethane, the superfine polyamide fiber has fast dyeing speed, poor level dyeing, poor dye depth, high dye consumption, low dye fastness, and polyurethane fiber The affinity of dyes is different, which affects the uniformity of dyeing, so it is very difficult to dye. Therefore, it is necessary to do a lot of experiments on dyes, auxiliaries and dyeing processes, select suitable dyes and auxiliaries, and determine the appropriate dyeing process to achieve the goals of leveling, deepness, penetration and maintaining high color fastness. The general dyeing process is: levelling agent 1%~3%, penetrating agent 1~3g/L, acid release agent to adjust the pH to 4~8, adding the required dye, and then raising the temperature to 35℃, press 1C/ Min rise to 65℃, 0.4℃/min to 105℃, keep for 90~120min, then cool down, wash with water or carry out necessary post-treatment.

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