Print head multi drop Gray scale ARTJET 2025

Print head multi drop Gray scale

 

Up until last time, we have summarized 24 UV printer ink supply problems and solutions.

This is a summary of all the issues that have occurred over the past 5 years. If you have a printer that uses the damper method, you can solve most problems by just looking at the link below.

Ink supply issue and solution summary

 

Now, I’m organizing the problems and symptoms related to the UV Printer head.

Before dealing with the actual problems and solutions, there are too many misconceptions about the head, so I’ll explain the basics first.

1.Does the head have a lifespan? Is a head warranty available?
2. “In what cases does the head free warranty apply?’
3. “They say it’s the same head but 2400 dpi?” Summary of the concept of printing resolution
4. “I don’t know what print head specs mean” Just by reading this, you will have the same level of knowledge as a printer distributor.
5. “Look at the actual head brochure and explain the important points to consider among the specifications and their meanings.”
6. “How do you jet ink from the head?”

 

Today I will explain grayscale and multi-drop.

I. Image quality comparison _Print head multi drop Gray scale

It was time that I sell UV printers to overseas market.
While the best quality was the Spectra 25 pl print head, our UV printer achieved the good image quality using KM 512 14 pl print head and sold a lot of equipment in a short period of time.
However, two years later, when OCE launched a new model, sales plummeted.
Our equipment is 14pl CMYK Lc Lm 6 colors, OCE is CMYK 4 colors but has the 7 pl small volume drop.
OCE was superior in terms of image quality, with not only small pico liters but also grayscale (variable dot precious) technology.

Based on the picture above, I will explain the image quality for each pico liter.

1. 14 pl 4 colors _Print head multi drop Gray scale

When expressing human skin tone, if only 4 colors are used in 14pl, the dark skin tone cannot be expressed with only magenta.

For this reason, black dots appear here and there in the areas where magenta falls.

The problem is that when 14pl black dots fall on light skin tones, the black dots that appear here and there are visible to the human eye, making the skin tone look rough.

In 2005, there was no print head that jetted small pico liters, so it was recognized as a limitation of UV printers.

For this reason, UV printers were not used for POP advertisements that are viewed from a close distance,

but POP was created by printing on general adhesive sheets with water and attaching them to form x or form board.

2. 14 pl CMYK Lc Lm _Print head multi drop Gray scale

If you use Light Magenta and Light Cyan, which are secondary colors of Magenta and Cyan,

You can use Lc Lm instead of block dot in the light part, so there are relatively less black dots.

If you use CMYK Lc Lm, light skin tones are expressed much more smoothly than when only CMYK 4 colors are used.

Because of this, many manufacturers have started to produce 6-color equipment instead of 4-color equipment.

3. 7 pl 4 color gray scale _Print head multi drop Gray scale

Although it is CMYK 4 colors, the image is expressed smoothly by adjusting the dot size on the far right in the picture above.

When viewed from a distance, the large dot appears as magenta, and the smallest dot appears light like light magenta.

And since there are also medium-sized dots, the color between magenta and Lm is also expressed.

Since Gray Scale technology can jet large pico and small pico dots with one color, the color range that can be expressed with one ink expands.

Even if you don’t use a lot of black dots for light skin tones, the skin tone is expressed,

so the image looks pretty, as in the picture below.

II. Process of creating multi drop in print head _Print head multi drop Gray scale

1. When a signal is given, one ink drop is ejected _Print head multi drop Gray scale

If you look at the picture below,

• Voltage is applied to give physical force to the upper plate containing ink.
• The upper plate bends once and pushes the ink, and the ink is jetted with that force.
• As shown in the first picture, if you push once, only one ink is jetted,
• and if you push once the second and third times, one drop of ink is jetted out each time.
• In this way, the print head only jets the same volume of ink drops.

So, how do large drops fall?

• The gap between the print head and the material is usually 1.2 mm or 1.5 mm. In inkjet, this gap is called stand off.
• Multi drop or Gray scale is not jetting different volumes of 7 pl, 14 pl, or 21 pl from the nozzle hole,
• but the same volume of ink is jetted, and in a short section of 1.2 or 1.5 mm, the ink is combined to create a large dot.
• The technology of combining ink in such a short section and jetting different volumes of ink onto the material is called Multi drop or Gray scale.

2. How does ink come together in that small space? _Print head multi drop Gray scale

Above, we talked about how ink is jetted when voltage is applied once.

When applying voltage, you can control several conditions.

• Voltage Power
• Will the voltage be applied gradually or suddenly?
• Voltage application time
• The time to wait for the next voltage after the first voltage.

If you look at the picture below,

• The voltage is applied for the same amount of time for the first and second,
• but the voltage application time is doubled for the third.
• When you do this, the first and second drops combine with the third drop to create a large volume of ink droplet within a stand-off distance of 1.2mm.
• Click here to see the video.

Waveform tuning.

Controlling the jetting condition through the head and finding the optimal value is called waveform tuning.
The head manufacturer and ink manufacturer work together to create a waveform and provide this waveform value to the printer manufacturer,
or the ink manufacturer purchases a dropwatcher, a device that can tune the waveform, and tunes the waveform without the help of the head manufacturer and provides it with the ink.

 

3. In reality _Print head multi drop Gray scale

Every time the head changes, every time the ink changes, you have to create the waveform.

In the beginning, the waveform provided by the head manufacturer was used as the default,

but as the printer manufacturer grew, they started to manufacture the dropwatcher equipment themselves and make the waveforms directly with the ink manufacturer.

Following the Japanese, American, and European printer manufacturers, Korea also started making waveforms through dropwatcher,

and now, it is the basic concept for Chinese UV printer manufacturers or specialized companies that develop boards and SW.

In addition, ink manufacturers also purchase dropwatchers and tune the waveforms to make ink.

 

III. This is how ARTJET supports our customers.

One thing I feel while selling and maintaining ARTJET UV Printers for 5 years is that the next most important thing after product stability is Troubleshooting DATA.

All products have problems, whether they are actual equipment problems or consumer errors, and product stability is how easily and quickly you solve those problems.

We are organizing all the troubleshooting DATA as follows.

You can see the product print quality by clicking here.

 

1. Complete Guide to Printhead Problems and Solutions

ARTJET UV Printer Problems and Solution _Printhead Problems Summary

Additional issue and solution
The red color does not appear at first, then appears during printing, and then does not appear again
Printhead replacement video and precautions

2. Complete Guide to Ink Supply Problems and Solutions

Previously sorted, ink supply problem summary
Updated ink supply problem summary

 

3. Mechanical problem and Solutions 

1. How to align the print head in a straight line
2. There is a clicking noise from the X-axis
3. Banding problem in specific section
4. The Importance of Head Height in Bidirectional Printing
5. Problems that occur when the wiper height is high
6. When the cleaning belt screw is loose
7. When the capping fixing plate does not fit
8. How do I prepare the ARTJET electricity?
9.When Anti-crash becomes a jam in captop
10. Print head Anti crash system 

 

4. Electron board and Software problem is hereunder. 

1. The printer works but printing does not work
2. Resetting to default settings
3. Touch panel does not turn on
4. The printer is printing, but nothing is printed
5. Software closes when I just press the print button
6. Printing in the wrong place
7. Positioning misalignment in X-axis direction
8. How to make the Offset fine tune
9. Vertical offset is not correct only for the right section of white
10. Software turn off when click print button

 

5. Sai Flexi Rip software  

1. How to make the Spot Color & several mistakes
2. Color is strange after applying Spot color
3. White is sticking out
4. Installation and Dongle Key Recognition Failure Measures
5. Dongle Key Recognition Failure
6. White lines appear when printing only color
7. Color Adjustment through Graph
8. Print size compensation
9. Ink Consumption Calculation
10. What is ICC profile & menu board UV Printing
11. Dongle Key recognition Failure from USB port

 

6. Problems and solutions from actual consumer sites

1. Paper that absorbs ink
2. A line-like thing appears at the end of the white print surface
3.Can varnish banding be reduced?
4. Are there many problems with China’s UV Printer?

7. UV Printer Application 

we are explaining not only UV printer problems and solutions, but also what products are produced with UV printers.

1. Braille printing
2. Flip the material and align it
3. 2.5D UV print
4. ARTJET UV Printer Application 6 _아크릴 본딩 장비
5. I phone 14 print limitation 
6. Mask printing not recommend
7. Leather Cigarette Case UV Printing
8. Round soccer strategy board UV printing
9. Primer  performance & limitation 
10. UV Print & Laser crop mark cutting
11. Mobil case UV print profit
12. Screen vs Digital Comparison and UV Printing on Hand Sanitizer Cases
13. Bottle zig & print
14. Canvas UV Printing
15. Applying epoxy effect with varnish
16. Making a light frame with UV Printer & Laser cutter
17. UV Printer & Laser Cutting Equipment Button Name Tag Making
18. UV Printer & Laser Cutting Making a Cell Phone GripTok
19. Making an Acrylic Keychain with UV Printer & Laser Cutter
20. UV Print with Zig
21. How to make RD WORKS CCD camera cutting Video manual
22. Acrylic bonding equipment
23. All the steps to create UVDTF
24. UVDTF TEST Result on various material
25. ARTJET CW+C Print time & Ink Cost
26. Create a white shield with different images on the front and back of the keyring
27. Keyring Business Required Equipment and Investment Costs
29. Acrylic Lighting Goods
30. Ballpoint pen jig printing
31. Staining occurs when printing on coated leather

 

 

That’s it for today.