It is obvious that the upgrading of cylinder dyeing machine can improve the printing and dyeing quality. And in the printing and dyeing process is also very important, today we talk about: drum dyeing machine dyeing simulation proofing!

1、 Equipment simulation:

Small sample dyeing should generally follow the conditions of large-scale production. There are overflow dyeing machine, jet dyeing machine and so on. There are various forms of small sample machines, such as infrared heating type, oscillating type, rotating type, lifting type, etc. What kind of small sample machine to choose depends on the large-scale production equipment.

2、 Simulation of dyes, chemicals and auxiliaries:

Small samples and large-scale production will not be made at the same time, which may cause differences in dyes, chemicals and auxiliaries. There are more or less differences between different batches of dyestuffs, chemicals and auxiliaries produced by different manufacturers or the same manufacturer, such as shade, solubility and dispersibility, particle size distribution, strength, etc.

The content of active ingredients, impurities and their contents of adjuvants are unstable, and the original prescription often needs to be adjusted after changing batches. In addition, during the storage of some dyes and chemicals or auxiliaries, due to the long storage time or the influence of water vapor, acid, alkaline, oxidizing and reducing gases in the air, the dye uptake or shade changes, and the effective components of auxiliaries decrease or fail, all of which affect the dye uptake and cause color difference.

The dye solution can be used for more than one week in the laboratory, and it is prepared and used in the large sample production. The quality of dye solution in laboratory may be changed due to long storage time. Therefore, dyes, chemicals and auxiliaries can be taken from the workshop during simulation proofing.

3、 Simulation of dyeing blank:

The dye uptake of different fibers is different, and the dye uptake of the same fiber with different linear density, warp and weft density is also different. During spinning, the difference of chemical fiber raw materials and spinning process conditions also affect the dye uptake on the dyed blank.

For natural fibers, such as cotton and silk, the color absorption rate will be affected by the climate, region and season. Different twist yarns dyed with the same dye have different dye uptake.

4、 Dyeing process simulation:

The dyeing process of laboratory simulation proofing should choose the dyeing process suitable for the dye and realized by the production equipment. Otherwise, the small sample and large sample are dyed by different processes, and the single dye may only be different in depth, which will cause the change of hue and shade when mixing.

The process parameters of dyeing process and sample size, such as bath ratio, heating rate, holding time, dye solution and yarn movement, should be imitated as much as possible.

5、 Color light source:

Now the general printing and dyeing factory laboratory is equipped with a standard light box. But many workshops use natural light or general lighting to color.

Even if there are light boxes in the workshop, if the light boxes in the workshop and the light boxes in the laboratory are purchased from different manufacturers or at different times, because the loss of the light tubes is different, the color feeling will also be different. Therefore, we should try to use the same light box to color.

6、 After finishing:

After the laboratory makes the sample, it usually confirms or provides the prescription to the customer immediately, and there is no finishing process. But after the large sample production, it is necessary to finish this process, such as flattening, mercerizing, setting, whitening, resin, calendering, etc.

At present, many finishing agents, such as softeners, will affect the color light and cause color difference between small sample and large sample. The yarn situation is more complex, yarn will be woven into fabric, fabric will have finishing process, this series of processing will make the color change.

If possible, before providing the production prescription, the laboratory should deal with the small sample in the same way as the large sample, and adjust the prescription in the laboratory to provide the finished product sample and dyed sample for the workshop, which is the basis of sample imitation during dyeing.