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Color Difference Prevention Plan for Dyeing Cotton Knitted Fabric 2

Feeding and heating curve:

The dyeing process of reactive dyes is divided into three stages: adsorption, diffusion and fixation. A reasonable dyeing process should have the following characteristics:

Can slow down the initial dye uptake rate of reactive dyes,

It can make the different dyeing stages have complete effects, and there is no phenomenon of balancing the effects of the two processes.

The dye bath conditions change mildly, gradually, and relatively not drastically. ...

In actual production, the following two processes are compared, and the results show that the improved dyeing process two can improve the dyeing effect of the cloth surface and reduce the color difference. That is, to extend the feeding time appropriately, add alkali in batches, and increase the gradient of the addition amount, which can reduce the color difference to a certain extent.

Dyeing equipment:

Most of the dyeing of pure cotton knitted fabrics uses an overflow jet rope dyeing machine. The main pump flow and nozzle pressure of most dyeing machines are adjustable, and the fabric speed of each tube can be independently controlled. Therefore, according to the structural characteristics of different fabrics (such as thinness and thickness, tightness and sparseness, length and shortness of each tube), Adjust the flow, pressure and cloth speed to form the best dyeing conditions. ...

Since the circulation speed of the dye liquor in the dyeing machine determines the contact frequency between the dye molecules and the cotton fiber, the higher the contact frequency, the more conducive to level dyeing. Therefore, speed up the circulation of the fabric in the dyeing machine and increase the flow rate of the main pump. Nozzle pressure can reduce the color difference to a certain extent. However, these process parameters cannot be improved infinitely, and will damage the strength of the fabric to a certain extent. It is necessary to find an optimal bonding point in practice to obtain a suitable process.

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