Color swatch confirmation
1 Swatch-like self-evaluation
Use gray cards for color matching. Grade 4.5 is required between the original sample and the sample. When using a measuring instrument for color matching, generally △ E <1, taking into account the system error, the internal control standard △ E <0.6, and strive to be accurate. If high requirements, hue △ H and chroma △ C should be taken into account.
To fully understand the thermal and photosensitivity of the dye. There are fewer photosensitive dyes, such as Ciba clone yellow CR-01, especially Ciba clone yellow C-2R. Most dyes are more or less thermally sensitive, Shihlin dyes are more prominent, and cold and hot dry and wet have an impact on color light. When proofing such dyes, the trend of the dye's stable color light should be considered, and the intention is to reverse. Deviate a little. For example, most dyes have a slightly darker red light after the color light is stable. When the color is just slightly cold after coloring, the green light should be slightly brighter, so that when the color light is stable, it is exactly equal to the original. Light-sensitive and heat-sensitive dyes are used as the main color proofing, which may cause large-scale color cloths to be stacked with color files 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 is in line with the customer's requirements, we must know the general customer's proofing, and it is easy to sample according to the customer's habits. Different regions have different color preferences. For example, European orders avoid red, which can be slightly green. Different consumer groups of fabrics have different color and light biases. For example, children's clothing generally likes to be gorgeous; men's clothing should be as neutral as possible, color saturation should be low and darker; women's clothing should be bright.
General customers require at least 3 prototypes, that is, A, B, and C samples, and sometimes 12 samples are required. From the perspective of light, dark, bright and bright and equal, so as to improve the accuracy rate of a sample.
2 Recognition of samples
When the customer's opinion differs from the actual situation, the possible light source problems should be considered, and the customer should be communicated.
When the customer reflects that most of the samples in a swatch are darker, it should be considered that the customer may be a double-layered sample, especially a thin, transparent fabric, and the stack will look darker. Some large companies require 4 layers of color matching for thin, transparent woven fabrics and knitted fabrics. The conventional method is single-layer color matching.
When the "jumper" is serious, consider replacing the dye to improve the "jumper". To understand the metamerism of a dye, make full use of a colorimeter to screen the dye. When our factory's applicable dyes cannot meet the customer's "jumping lamp" requirements or the "jumping lamp" is △ E <0.5, it should communicate with the customer. Once the factory's sample is confirmed, and the confirmation sample is used as the reference sample, there is no “jumping light” problem. Do not choose a large-scale unstable dyeing formula in order to meet customer requirements.
When directly producing samples for color matching, you should try to match colors under various light sources, such as D65 natural light, fluorescent lamp, and do not have serious "jumping lights". If it is serious, please confirm the customer before production.
3 Confirmation of production of large samples (head cylinder samples)
The color and light requirements for the production of large samples should be strictly based on the customer's approval, and the original sample should be biased toward the confirmation sample. It is best to persuade the customer to use the confirmation sample as the benchmark to bias the original sample. Because it is confirmed that the specifications of the fabric are the same as those of the large goods, it is easy to see the samples, the dyes used are the same, and there is no "jumping light" phenomenon. Generally, the color light is between the two, the gray card is above level 4, △ 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, and the left, middle, and right color difference is controlled above level 4-5, and the batch difference ΔE <1 (within internal control 0.8). When choosing dyes, try to use dyes that are consistent with the sample prescription. Adjusting the color and light, newly added dyes may cause "light jumping" phenomenon. When large goods samples and confirmation samples have obvious "light jumping", there will be a risk of large goods rejection, which will bring economic losses and reduce credibility to the enterprise. For example, common dyes with reversed spectral spectrum, such as: emerald blue, Shilin RB yuan, B green, T green, R red, etc., should be handled with care when adding dyes, and check whether there is a serious "jumping light" under each light source. If so, they cannot be added.
When turning orders and replenishing orders, the head tank confirmation sample is generally used as the reference to the original sample and the confirmation sample is biased to maintain the same batch of colored light. However, when customers insist on using the original or confirmed sample as the reference, the colored light direction must consider the large sample color .
Finishing has an impact on color light and changes color to different color lights. Therefore, after dyeing and staking out the samples of the finishing process, the shading should be adjusted to meet the customer's requirements.
Common problems and countermeasures
1 Light color fastness
In the laboratory, when the sample is sampled, the color plate with light fastness requirements is required. Before the sample is sampled, it is required to choose a dye with good light fastness, including auxiliary colors, which must also meet the customer's color fastness requirements. If there is a dye with poor sun fastness in a formula, the sun fastness of this shade will decrease. In addition, the compatibility of the dyes should also be considered, such as: Ciba Red C-2BL used with yellow CR-01, its light fastness decreases, but when used separately, the light fastness is very good. The blending of green FFB and yellow GCN in Shihlin dye did not reduce the light fastness, but still caused the brittleness of cellulose fibers. The preferred dye for light-colored dyeing is Shihlin dye. The dyeing with Shihlin dye without reactive dyes is full and clean.
The light fastness on the dye color card refers to the ISO standard, and the test result is a level 8 system; the American standard AATCC standard is a level 5 system, which is very different. The series of light fastness on the dye color card refers to the series at the standard concentration I: 1, so when the reactive dye is dyed light color, it depends on the corresponding concentration series on the dye color card, such as 1/6, 1/12 , 1/25 and so on.
2 Metamerism
Jumping is one of the most common problems in proofing. In actual operation, you will encounter the phenomenon of light transfer and metamerism.
Use the light box to check the "jumping lamp" situation, and initially select the synchronized "jumping lamp" dyeing recipe proofing from the accumulated experience prescriptions. When the close dye formula cannot be selected in the accumulated color block samples, use the original and monochrome Under the light source, look for a dyeing model similar to the "jump light".
With the aid of a colorimeter and colorimetric software, the data is calculated between the standard sample and the single chromatogram, and the initial selection of the dyes for the spelling is required. This requires colorimetric technology and forecasting experience.
With the help of color measuring instrument and color matching software, you can quickly find the dye formula that meets the requirements of the light source and close to the customer, and intuitively and accurately know whether it meets the customer's multi-light source requirements. There are many brands of colorimeters, and there are some differences in the measured data between them. GretagMacbeth 7000A software is better. It is compatible with major brands of colorimeters in the world. The most distinctive feature is Netprofiler software. It is established based on data exchange between Internet-based colorimeters. The error between the color meter on the Internet and the standard color meter in the United States was reduced to a permissible range. It can choose the color of three light sources at the same time, so you can get the optimal formula in a few minutes. If you meet the customer's requirements, you can proof the color immediately and send the data to the customer for confirmation. The color jumper is first transmitted to the customer, and the proof is sought after consulting the customer, which greatly shortens the proofing process-confirming this process. American Wal. When Mart places orders in 2005, it will use data transmission to place color samples. The color quality control procedure of textiles is based on the colorimeter data. Therefore, future colors can be described with numbers.
Online ordering and online bidding have become commonplace in today's social trends. Buyers place an order for multiple textile operating companies to bid, and marketers place orders to multiple manufacturers to color patterns at the same time. Therefore, for enterprises, fast, accurate, and good swatches are the first step in winning orders. Doing a good job of product quality, accuracy, and stability is the test of the strength and endurance of the enterprise, and is the foundation of the sustainable development of the enterprise.
