There are often conversations between designers and printing houses about who is right and who is wrong. In many cases, the production department believes that "as long as the designers change the method, they can print better." But the designers retorted: "I don't know what it has to do." Because the designers have never passed Indian training can't really complain about them. In fact, designers should be encouraged to go to the production site and let them see the final printing effect of the entire job. The purpose of this article is to help designers understand more about the screen printing process and take more responsibility for the final print.
1. Responsible for issuing invoices
This may be contrary to the ideas of many printing houses. In terms of personal feeling, if you do it yourself, you will know it if you remember it. Designers should specifically specify the printing color sequence, mesh number and exposure times, etc., see Table 1. If nothing else, work hours in the platemaking, ink and printing production departments.
Table 1 Suggested screens, printing color sequences and others marked on the film
Customer name Job number Ink color Job name Date Clothing color Printing position Screen mesh number Remarks Printing color sequence2. Learn from samples
Designers often say that they have n’t seen the final finished garment. This is unbelievable. Is this printing company unable to afford image designers a production sample for them to learn?
3. Determine the correct printing color sequence
When printing on light-colored clothing, the printing color sequence is usually from light to dark, or from the minimum ink volume to a large ink volume, because the ink will stick to the back of the screen, and the dark color is not expected to stain the light color.
Printing on dark clothing, usually with a white background, or solid or tone dots. This layer of white must be cured by light before printing various colors on it. The typical printing color sequence is from light to dark, and any large area of ​​the main color must be printed last, see Figure 1.
Figure 1. On dark clothes, use white ink as the base, then print from the lightest color, and the largest coverage area or main color is printed last.
For true four-color screening (CMYK) jobs, the YMCK color sequence is used. Any spot color must be printed after a similar primary color, such as red after magenta.
4. The choice of wire mesh
This will vary depending on the type of job done. Generally speaking, the simple design uses 45T (45 lines per cm) wire mesh. For more complicated jobs, the wire mesh can reach 77T. For finer mesh adjustment, 90 ~ 120 mesh wire mesh can be used. You should use 77 ~ 90 mesh screen version as the base, and use 120 mesh or finer screen to print the color.
5. Clothing printing is not paper printing
Decompose and transform a large pattern into large dots (55lpi to 65lpi), then transfer these dots to the template, and then print these dots on the finished clothing, which is completely different from paper printing.
Although three primary colors can be used to print some images, most jobs are printed in spot colors. On black clothing, do not use CMYK primary color ink to print, because the printing will become very dark on the background color, and use standard spot color ink to print on the white background color of screen printing. This is the so-called "simulation" or "simulation" three primary colors.
6. Design screen display and actual effect
The image you see on the monitor is good, but the image on the screen is not what you will get. When screen printing, everything is "expanded", this is the so-called "network expansion". If there is a 20% density area in the image, convert it to 20% dots and print it out, the dots may expand to 40% of the original size, so that there will be nearly 30% dot density on the clothing, in dark Tuning the area will become more serious. 70% of the outlets may be printed on the ground (100%). When separating colors, you must consider lighter, leaving room for a large number of dot expansion, see Figure 2.
7. The printer can't relax
After seeing the proof, sit in the studio and make some minor modifications, which is easy to do. The subtle adjustment of two or three colors means that two or three screen printing plates must be remade, the old screen printing plate must be removed from the printing machine, the new screen printing plate must be installed, repositioning and trial printing, etc. It's not easy.
The matching colors are the same. It is not easy to match the small color blocks printed on the glossy paper with the colors printed on the fabric. This should be as flexible as possible.
8. Common language
Working with designers every day, I found that there are two different languages. Producers will complain that "red" is not bright enough on black fabrics. It may be strange why red is no longer brighter. In fact, this has nothing to do with red. On black fabrics, red generally needs to be primed. It may be that your background color is not bright enough, or the production personnel need to reduce the speed of the scraping ink, use a lower mesh screen, change the angle of scraping ink, or use a comparison The opaque white background color makes the background color brighter, which makes the printed red lighter.
9. Limitations of the screen printing department
There is no reason to expect that the screen printing and plate-making department can produce 2% of the outlets on the screen. This cannot be done, but individual people can do it. Need to make a test film with different density from 5% to higher, the plate making department can print, let them print proofs to see the results. At the same time, if the tension of the silk screen used by the plate-making department is not appropriate, the resulting dot expansion may reach 50% to 60% or more. This should be taken into account when the mesh is modulated.
If the screen printing workshop cannot guarantee accurate overprinting, consider overprinting black and other colors at 2 to 4 positions of the spot color job.
These are the issues that designers should consider when making screen-printed color separations.
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