Color sample confirmation

1. Self-evaluation of color samples

Use gray cards to match colors. Level 4.5 is required between the original sample and the sample sample. When using a measuring and matching instrument for color matching, generally ∆E<1, taking into account the system error, the internal control standard ∆E<0.6, strive for a standard sample. For high requirements, hue ∆H and saturation ∆C should also be taken into consideration. To fully understand the heat sensitivity and photosensitivity of the dye. There are few photosensitive dyes, such as try not to use Cibacron Yellow CR-01, especially Cibacron Yellow C-2R. Most dyes have more or less heat sensitivity. Shihlin dyes are more prominent. Cold, hot, dry and wet have an impact on the shade. When proofing such dyes, consider the tendency of the dye to stabilize after the dye, and intentionally reverse it. Deviate a bit. For example, most dyes tend to be slightly darker to red light after they are stabilized, and when the color is slightly cold after printing, they should be slightly greenish light so that the color light is just equal to the original when it is stable. Dyes with severe photosensitivity and heat sensitivity are used as the main color proofing, which may cause large-scale production of color cloth stacking and printing, and even irreversible in severe cases, such as olive green R, yellow C-2R and other dyes. Therefore, such dyes cannot be used.

Whether the prototype meets the customer's requirements, we must know how to make a sample for regular customers, and it is easy to match the customer's habits. Different regions have different color preferences. For example, European orders avoid red and can be slightly greenish. Different consumer groups of fabrics have different color and light bias. For example, children's clothing generally likes to be gorgeous; men's clothing should try to be neutral, with low color saturation and dark gray; women's clothing should be bright and so on.

General customers require at least 3 prototypes, namely A, B, C samples, and sometimes 12 samples. Consider from the aspect of depth, light and shade, bright and bright, and color, so as to improve the accuracy of the first time.

2. Recognition of the sample

When the customer's opinion differs from the actual situation, the light source should be considered and communicate with the customer.

When the customer reports that most of the samples in a color palette are too dark, it should be considered that the customer may have a double-layer counterpart, especially for thin and transparent fabrics, which will become darker when stacked. Some large companies require 4 layers of color matching for thin and transparent woven fabrics and knitted fabrics. The conventional is a single-layer contrast.

When the "light jumping" is serious, consider replacing the dye to improve the "light jumping". To understand the "metamer" performance of dyes, make full use of colorimeters to screen dyes. When the dyestuffs applied by our factory cannot meet the customer's "jumping light" requirement or the "jumping light" is ∆E<0.5, we should communicate with the customer to confirm the sample of our factory. When the confirmed sample is used as the reference sample, there is no "jumping". Light" problem. Never choose a dye formulation that is unstable in mass production to meet customer requirements.

When directly producing samples for color matching, you should try to match the colors under various light sources, such as D65 natural light, fluorescent lamps, and do not have serious "jumping lights". If it is serious, please confirm before production.

3. Confirmation of production of large sample (head cylinder sample)

The color and light requirements for the production of large samples should be strictly in accordance with the customer's approval opinions, and the original sample should be used as the basis to confirm the deviation. It is best to persuade the customer to use the confirmed sample as the basis to deviation from the original sample. Because the fabric specifications of the confirmed sample are consistent with the large sample, it is easy to see the sample, the dyes used are the same, and there is no "light jumping" phenomenon. Generally, the color light is between the two, the gray card reaches 4 or more, ∆E<1 (the internal control standard is generally ∆E<0.8), and customers will recognize it.

The batch difference is controlled above level 4 of the gray card, the left, middle and right color difference is controlled above level 4 to 5, and the batch difference ∆E<1 (within 0.8 of the internal control). When selecting dyes, try to use dyes consistent with the sample prescription. Adjust the color and light, the newly added dyes may cause the phenomenon of "bounce light". When there is an obvious "bounce light" between the large sample and the confirmed sample, there will be the risk of rejection of the large product, which will bring economic loss and lower reputation to the enterprise. For example, when the commonly used dyes with reverse spectrum, such as turquoise blue, soil forest RB yuan, B green, T green, R scarlet, etc., are used as added dyes, they should be handled carefully, and check whether there is a serious "light jumping" phenomenon under each light source. If there is, it cannot be added.

When re-ordering and replenishing orders, the head cylinder confirmation sample is generally used as the basis to deviate from the original sample and the confirmed sample to maintain the consistency of the entire batch. However, sometimes the customer insists on the original or confirmed sample as the basis, and the color and light trend must be considered for the large sample. Shade.

Finishing has an effect on the shade, and the color changes to different shades. Therefore, after dyeing and lofting, imitating the samples in the finishing process, adjust the shade and dye them to meet customer requirements.

Common problems and countermeasures

1. Color fastness to light

When drawing samples in the laboratory, for swatches with light fastness requirements, it is required to select dyes with good light fastness before drawing samples, including auxiliary colors that must meet the customer's color fastness requirements. If there is a dye with poor light fastness in a formula, the light fastness of this color number will decrease. In addition, the compatibility of dyes should also be considered. For example, when Ciba Red C-2BL is used together with Yellow CR-01, the light fastness is reduced, but when used separately, the light fastness is very good. Although the blending of green FFB and yellow GCN in soil forest dyes did not decrease the light fastness, it still caused cellulose fiber brittleness. The first choice for dyeing light colors is Shihlin dyes, and the colors that are dyed with Shilin dyes are plump and even if they are not dyed with reactive dyes.

The light fastness on the dye color card refers to the SO standard, and the test result is an 8-level system; the American standard AATCO standard is a 5-level system, which is very different. The light fastness level on the dye color card refers to the level when the standard concentration is 1:1. Therefore, when the reactive dye is dyed in light colors, it depends on the corresponding concentration level on the dye color card, such as 1/6, 1/12 , 1/25 and other indicators.

2. Metamerism

Bounce light is one of the most common problems in proofing. In actual operation, you will encounter the phenomenon of light color conversion and metamerism. Use the light box to check the "light jumping" situation, and initially select the dyeing prescription for synchronous "light jumping" from the accumulated experience prescriptions. When the close dye formula cannot be selected from the accumulated color block samples, use the original and single color Under the light source, look for a dye coloring template similar to the "jumping light".

With the help of color measurement instrument and color measurement software, the data is measured between the standard sample and the single color spectrum, and the dye is initially selected. This requires color measurement technology and prediction experience.

With the help of color matching instrument and color matching software, we can quickly find the dye formula that meets the requirements of the light source and is close to the customer, and intuitively and accurately know whether it meets the customer's multi-light source requirements. There are many brands of color matching instruments, and the data measured between them also have certain differences.

GretagMacbeth 7000A software is better. It can be compatible with major brands of color measurement instruments in the world. The most distinctive one is Netprofiler software. The error between the color measuring instrument on the Internet and the standard color measuring instrument in the United States is reduced to the allowable range. It can choose the color matching of three light sources at the same time, so you can obtain the optimal formula within a few minutes. If it meets the customer's requirements, you can immediately sample and measure the color, and send the data to the customer for confirmation. If the "bounce light" problem cannot be solved, you can First, the color matching "light jumping" situation is transmitted to the customer, and the customer's opinions are consulted before making a sample, which greatly shortens the process of making a sample-confirmation. When the American WaI.Mart company placed an order in 2005, it will use the method of data transmission to download the color samples. The color quality control procedures of textiles shall be based on the data of the color measuring instrument. Therefore, in the future, colors can be described by numbers.

Online ordering and online bidding have become common things in today's social trends. Buyers place an order for multiple textile companies to bid, and marketers place orders to multiple manufacturers to print color samples at the same time. Therefore, for companies, fast, accurate, and good color patterns are the first steps to win orders. Doing a good job of product quality, being accurate, and stabilizing the color are the test of the strength and endurance of the company, and it is the foundation of the company's sustainable development.