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Sample confirmation




Self-evaluation of 1-color pattern




Colour with grey card. Level 4.5 is required between the original sample and the sample. When color matching is performed with a measuring and matching instrument, generally E < 1. Considering the system error, the internal control standard E < 0.6 strives for one-time calibration. In case of high requirements, the hue H and chroma C should also be taken into account.




It is necessary to fully understand the thermosensitivity and photosensitivity of dyes. Photosensitive dyes are less, such as the use of Cibacron Yellow CR-01 as far as possible, especially the C-2R of Cibacron Yellow. Most dyes are more or less thermally sensitive. Schilling dyes show prominent performance. Cold, hot, dry and wet have an impact on the color and light. When proofing this kind of dyes, we should take into account the trend of stable dye color and light, and intentionally deviate a little from the opposite direction. For example, most dyes tend to red light after stabilization, and green light should be a little brighter when the sample is cold, so that when the color is stable, it is just the same as the original. Photosensitive and thermally sensitive dyes as the main tone proofing may result in large-scale production of color cloth stacking and printing, even irreversible, such as olive green R, yellow C-2R and other dyes. Therefore, such dyes cannot be used.




Whether the hand pattern meets the customer's requirements or not, we should have a good idea of the routine customer proofing, and it is easy to proofread according to the customer's habits. Different regions have different preferences for color. For example, European orders are not red, they can be slightly green. Fabric consumption groups are different, their color preferences are also different, such as children's wear generally like gorgeous; men's wear should try to neutral tone, low color saturation, a little darker; women's wear color should be bright and so on.




Ordinary customers require at least three hand patterns, namely A, B, C, and sometimes 12. Considering the shade, brightness, brightness and color, the first sample rate can be improved.




2. Recognition of Samples




When the customer's opinions differ from the actual situation, the possible light source should be taken into account and the customer should be communicated.




When the customer responds to the deep majority of the samples in a color plate, it should be considered that the customer may be double-layer counterparts, especially thin and transparent fabrics, which will deepen the stacking appearance. Some large companies require four layers of color matching for thin, transparent fabrics and knitted fabrics. The convention is single-layer color matching.




When the "jump lamp" is serious, consider replacing dyes to improve the "jump lamp". In order to understand the "homochromic and heterographic" properties of dyes, we should make full use of the colorimeter to screen dyes. When the dyestuff used in our factory can not meet the customer's "jump lamp" requirement or "jump lamp" in E < 0.5, we should communicate with the customer. Once the sample of our factory is confirmed and the sample is taken as the reference sample, there is no "jump lamp" problem. Never choose unstable dyeing formula for large-scale production in order to meet customer's requirements.




In the direct production of sample coloring, we should try to color under various light sources, such as D65 natural light, fluorescent lamp, do not have serious "jump lamp", if serious, please confirm and reproduce.




Confirmation of Production of 3 Large Samples (Head Cylinder Samples)




The requirement of colour and light for large sample production should be strictly in accordance with the customer's approval opinion and be biased towards the confirmation sample based on the original sample. It is better to persuade the customer to be biased towards the original sample based on the confirmation sample. Because the fabric specifications of the confirmed samples are the same as those of the bulk samples, it is easy to look, the dyes used are the same, and there is no "jump lamp" phenomenon. The general color light between the two, gray card up to 4 levels, E < 1 (internal control standard is generally E < 0.8), customers will recognize.




The batch difference is controlled at gray card level 4 or above, the left, middle and right color difference is controlled at level 4 or above, and the batch difference (E < 1) (the internal control is less than 0.8). When choosing dyes, try to use the same dyes as the sample prescription. Adjusting the color and light, the newly added dyes may cause "jump-lamp" phenomenon. When there is obvious "jump-lamp" between the bulk sample and the confirmation sample, there will be the risk of rejection of the bulk product, which will bring economic losses and reduce the reputation of the enterprise. If dyes with reversed spectra, such as Turquoise blue, Schilling RB yuan, B green, T green, R scarlet, etc. are commonly used as dyes to be added, they should be handled carefully. There is a serious "jump lamp" under various light sources. If there is one, it can not be added.




When duplicating and replenishing orders, it is generally based on the confirmation sample of the head cylinder to deviate from the original sample and the confirmation sample, so as to maintain the consistency of the whole batch of color and light, but sometimes when customers insist on the original sample or confirmation sample as the basis, the direction of color and light must consider the large sample color.




Post-finishing has an effect on the color light, and the discoloration of different color light varies. Therefore, after dyeing and lofting, after imitating and finishing process samples, to adjust the dyeing after shading, in order to meet customer requirements.




Common problems and Countermeasures




1 light colour fastness




The color plate required for light fastness in laboratory sample making should select dyes with good light fastness before sample making, including auxiliary colors, which should also meet the customer's color fastness requirements. If there is a dye with poor fastness to sunlight in a formula, the fastness to sunlight of this color number will be reduced. In addition, the compatibility of dyes should also be considered, such as: the light fastness of C-2BL with yellow CR-01 decreases, but when used separately, the light fastness is very good. Although the light fastness of green FFB and yellow GCN blended in Shilin dye did not decrease, the cellulose fibers still suffered from brittleness. The preferred dyestuff for light dyeing is Shilin dyestuff. The color of Shilin dyestuff without reactive dyestuff is plump and even.




The light fastness on dye color cards refers to the ISO standard. The result of the test is 8-level system. The AATCC standard is 5-level system, which differs greatly. The light fastness series on the dye color card refers to the series at the standard concentration I:1, so when dyeing light colors with reactive dyes, it depends on the corresponding concentration series on the dye color card, such as 1/6, 1/12, 1/25 and so on.




2. Homochromatic heterographic phenomena




Jumping lamp is the most important in proofing.

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