Textile color sample confirmation and solutions to common problems

1 Color Swatch Self-Evaluation

Use gray card for color matching. The requirement between the original sample and the sample is level 4.5. When using a measuring and matching instrument for color matching, generally △E<1, considering the system error, the internal control standard △E<0.6 , strive to get it right in one go. If the requirements are high, the hue △H and chroma △C should also be taken into consideration.

You must fully understand the heat sensitivity and photosensitivity of dyes. There are fewer dyes that are photosensitive. For example, try not to use Ciba Clone Yellow CR-01, especially Ciba Clone Yellow C-2R. Most dyes are more or less All have heat sensitivity, Shilin dyes are more outstanding. Cold, heat, dryness and humidity all have an impact on the color and light. When making color matching with this type of dye, the stability of the dye’s color and light should be taken into consideration. The final trend is intended to deviate a little in the opposite direction. For example, the color of most dyes tends to be slightly darker when the color is stable. When the color is slightly cold after the sample is printed, the color should be slightly lighter than the green color, so that when the color is stable, it is just the same as the original color. Using dyes with serious photosensitivity and heat sensitivity as the main color proofing may cause color printing on mass-produced color cloths, which may even be 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, you must be aware of regular customer proofing, and it is easy to make accurate samples based on customer habits. Different regions have different color preferences. For example, European orders avoid red and may prefer green light. Different consumer groups of fabrics have different color preferences. For example, children’s clothing generally likes bright colors; men’s clothing should be as neutral as possible, with low color saturation and darker colors; women’s clothing should be brighter, etc.

Generally, customers require at least 3 pieces of prototypes, namely samples A, B, and C. Sometimes, 12 samples are also required. Consider aspects such as depth, lightness, brightness, and hue to improve the first-time accuracy rate.

2 for the sampleApproval

When the customer’s opinion differs from the actual situation, possible light source problems should be considered and communicated with the customer.

When the customer reports that most of the samples in a color palette are darker, it should be considered that the customer may be comparing the samples in two layers, especially for thin and transparent fabrics. The samples will become darker when laminated. Some large companies require 4 layers of matching colors for thin and transparent woven fabrics and knitted fabrics. The norm is a single layer of color matching.

When the “jumping light” is serious, consider changing the dye to improve the “jumping light”. To understand the “metameric” properties of dyes, make full use of colorimeter to screen dyes. When our factory’s applicable dyes cannot meet the customer’s “light jumping” requirements or “light jumping” when △E<0.5, we should communicate with the customer. Once the factory's sample is confirmed and the confirmation sample is used as the reference sample, there will be no "jumping light" problem. Never choose a dyeing formula that is unstable in mass production just to meet customer requirements.

When color matching small samples for direct production, you should try to color match under various light sources, such as D65 natural light and fluorescent lamps. There should be no serious “light jumping”. If it is serious, please confirm it with the customer. Reproduction.

3 Confirmation of large sample (head cylinder sample) production

The color and light requirements for large sample production should be strictly in accordance with the customer’sThe approval opinion is to deviate from the original sample to the confirmed sample, so as to persuade the customer to deviate from the original sample based on the confirmed sample. Because the fabric specifications of the confirmed sample are consistent with the large sample, it is easy to see the sample, the dye used is consistent, and there is no “jumping light” phenomenon. Generally, the color light is between the two, the gray card reaches level 4 or above, △E<1 (the internal control standard is generally △E<0.8), and customers will recognize it.

The batch difference is controlled above gray card level 4, the color difference between left, center and right is controlled above level 4-5, and the batch difference △E<1 (within internal control 0.8). When choosing dyes, try to use dyes that are consistent with the sample prescription. Adjust the color light, and the newly added dye may cause a "jumping light" phenomenon. When there is an obvious "jumping light" between the large sample and the confirmation sample, there will be a risk of rejecting the bulk product, which will bring economic losses and Reduced credibility. For example, when commonly used dyes with opposite spectrums, such as emerald blue, Shilin RB yuan, B green, T green, R red, etc., are used as added dyes, they should be handled with caution and check under each light source to see if there is any serious "light jumping" ;, if present, cannot be added.

When repeating and replenishing orders, the confirmation sample of the head cylinder is generally used as the basis to deviate from the original sample and the confirmation sample to keep the color and light consistent for the entire batch. However, sometimes when the customer insists on using the original sample or the confirmation sample as the basis, the color and light direction Large sample shades must be considered.

After wrappingThe reason has an influence on the color light, and the color changes to different color lights. Therefore, after dyeing and setting out, the samples in the imitation finishing process need to be dyed after adjusting the color light to meet customer requirements.

1 Color fastness to light

When drawing samples in the laboratory, for color plates with light fastness requirements, dyes with good light fastness are required to be selected before making samples, including auxiliary colors, which must also meet the customer’s color fastness requirements. If in a formula If there is a dye with poor light fastness, the light fastness of this color number will be reduced. In addition, the compatibility of the dye should also be considered, such as Ciba Red. When C-2BL and yellow CR-01 are used together, the light fastness decreases, but when used separately, the light fastness is very good. Although the light fastness of Shilin dye medium green FFB and yellow GCN does not decrease, it still causes Cellulose fibers are brittle and damaged. The preferred dye for dyeing light colors is Shilin dye. The color dyed with Shilin dye is fuller and more uniform than reactive dyes.

The light fastness on the dye color card refers to the ISO standard, and the test result is an 8-level system; the American AATCC standard is a 5-level system, which is very different. The light fastness level on the dye color card is It refers to the series when the standard concentration is I: 1. Therefore, when dyeing light colors with reactive dyes, you should look at the corresponding concentration series on the dye color card, such as 1/6, 1/12, 1/25, etc.

2 Metamerism

Light jumping is one of the common problems in proofing. In actual operation, light color change and metamerism will be encountered.

Use a light box to check the “jumping light” situation, and initially select a dyeing recipe that synchronizes the “jumping light” from the accumulated experience prescriptions for proofing. When a close dye cannot be selected from the accumulated color block samples When formulating, use the original sample and the single-color sample to look for a dye color sample with a similar “jumping light” under the light source.

With the help of colorimeter and colorimetry software, perform data calculation between standard sample and single chromatogram, and initially select the dye to be used, which requires colorimetry technology and prediction Experience.

With the help of the color tester and color matching software, you can quickly find the dye formula that meets the light source requirements 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 there are certain differences in the data measured between them. The 7000A software is better. It is compatible with all major brands of color measuring instruments in the world. What is distinctive is the Netprofiler software, which is based on the data exchange between color measuring instruments on the Internet. Its online correction and detection functions enable everyone to Online color measurement The error between the instrument and the American standard colorimeter is reduced to the allowable range. It can select the color matching of three light sources at the same time, so the optimal formula can be obtained within a few minutes. If it meets the customer’s requirements, it can be sampled and measured immediately. , transmit the data to the customer for confirmation, if&l If the “jumping light” problem cannot be solved, you can first transmit the “jumping light” situation of the color matching to the customer, and then consult the customer’s opinion before making a sample, which greatly shortens the time of making a sample and confirming it. When placing orders from 2005, the American Wal-Mart Company will use color measurement data to determine the color quality of textiles. Description.

Online ordering and online bidding have become commonplace in today’s social trends. Buyers will submit an order to multiple textile operating companies to bid, while marketers will place orders to multiple manufacturers to print color samples at the same time. Things happen all the time. Therefore, for enterprises, making good color samples quickly and accurately is the first step to win orders.Product quality, accuracy, and stable color light are a test of an enterprise’s strength and endurance, and are the foundation for its sustainable development.