[Bloodsaler]

印刷时是没添加任何油墨添加剂的……

[colorgege]

印版出来后测量没有问题的话，放大镜观察确定50%的网点是不是刚好搭边，如果是圆网点估计60%的网点才是刚好交接在一起。

[湘滨]

A：请使用纯圆网输出进行比较。
B：从曲线来看，上面也提到网点没有轻微重影，形状是正常的。有可能压力偏轻一点，才会造成网点扩大最明显的部位收缩会最明显。

[ggf987654]

欧几里德网点其层次和清晰度仅仅次于方型网点，暗调网点也呈圆形，但不同于普
通圆形网点的暗调，暗调印刷扩大能有效控制，他是印刷界推荐的网点。
看图似乎40%和60%处都是椭圆形的

[many]

楼主是什么设备测量的网点呀？icplate 2吗，它应该是照像法计算面积比的，我以前也遇到和楼主一样的问题，一直没找到答案，所以希望有高手赐教，另外说一点，如果用528或530测量，即密度用戴维斯公式算出来的结果会不同，不会出现这种情况。

[Bloodsaler]

ICPlate是测印版的，我们从来没拿过它测过印刷品。这个测试结果528和SpectroEye都测过了，差不多都是这种情况……

[老济]

你还没有找到这个问题所在？

真是顽固的家伙。。

[Bloodsaler]

不是我顽固，是一些坛友也想知道问题所在……我反正顺其自然……

[salfo000]

测试版有没有在别的印刷机上测过(如果还有其他可用印刷机的话)，曲线是否异常？

[xxyyzz97]

应该和墨键关系不大。因为印了好几次了，每次结果多多少少都有点这样。而且也有色彩管理咨询公司参与其中联合进行印制。难道这个是和高宝机机器有关？因为公司里另一台三菱机采用同样条件下印制没有这个问题。
Can't download your attached photo, so did not see the dot gain curve.
Want to ask that, whether the KBA press having this dot gain all the time, or it will have the normal dot gain before?
Regarding 三菱机采用同样条件下印制, does it mean that the ink, fountain, plate, blanket, paper are the same?
There are lots of factor affecting the dot gain. We also need to see how is the do reproduce before making any comment.
Should not be the KBA design cause this problem.
What kind of paper is using in the test?

[Bloodsaler]

All I see is the report.The printing process I didn`t join in.All I know is The paper\Foutain\Blanket\Ink\Plate are the same in both tests.We use 神盾157g coated paper in the test.

[重庆印刷工]

换种点形状试试？可能结果会变化。

[xxyyzz97]

Bloodsaler,
You can reply in Chinese. I read Chinese.
Without see the print copy. It is not easy to analyze the problem.
Only can read all information from your post.
Knowing that materials and consumables are the same for both Mitsubishi and KBA. We can filter these causes.
There are many factors will affect dot gain.
Just name those I know:
1. Rollers and pressure are improperly set
2. Rollers or blankets are too soft
3. Ink is low in viscosity and/or tack
4. Ink color strength is too weak and ink film is too heavy
5. Ink is too receptive to water
6. Blanket are packed improperly or too much pressure exists
7. Ink is pilling
8. Plate is poorly desensitized
9. Dampening system is dirty
10. Fountain solution pH or conductivity is out of balance
11. Sluring or doubling occur in halftone
12. Plate is improperly exposed and developed

From your previous posts, knowing that K and Cyan is very serious and M and Y were close to OK (guess, because I can't download your attachment).
Clause 8, 10, and 12 can be eliminate.
I suppose the M and Y is OK, that means in your KBA, you have 2 color is not OK, I also did not know what is the result OK the ink sequence change, whether the C having improve or remain the same and same as M situation. If after change the ink sequence there is no noticeable change in C and Y dot gain curve. Then clause 1, 2 and 6 also can eliminate.
The clause left would be 3, 4, 5, 7, 9 and 11.
You also mentioned that the ink is the same in Mitsubishi, then we can put clause 4 in the last.
If your KBA don't have sluring and double, clause 11 also can eliminate.
The problem would be caused by ink and water.
For me, the 1st thing I will change would be water.
Hope this can help.

[xxyyzz97]

Changing dot (screen) shape will not help.
Which is not related to this dot gain problem.

[xxyyzz97]

For me, the 1st thing I will change would be water.

Should be, the first thing to check would be water.