Low Spots or Skip Outs

tsfx

Active member
Good Day,
We are a flexo print facility and have been having some low spot issues recently. We have liquid pour plates and a WH Press. I have put a question out to my vendor for assistance but figured I'd double-down and head to the forums for confirmation. In the attached images you can see the low spots printed on our press.

The plates have been reviewed prior to sending to the press department. This issue was not recognized during the review.
After printing, we can see the issues and it is felt within the plate. This is something that could possibly have been missed during the review. But I feel this is happening too often for so many plates to be missed.

I just wanted to know if anyone has seen anything similar and if they might have an idea of what could be the cause.
In my experience, I have seen low spots. But nothing quite like what is seen in images 06 and 07.

Thanks for any feedback.
 

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SteveSuffRIT

Well-known member
Are these photos inked, on plate or substrate (#4 is)?
A low spot can occur at 0.002"-.003" and you will never see this in an un-inked plate.
Don't forget, the impression pressure is the total combination of plate, sticky back tape, plate cylinder or sleeve, and impression drum. In the first 3, it's location will not move.
#6 & 7 do have a harder edge, which would be the plate.
 

tsfx

Active member
Are these photos inked, on plate or substrate (#4 is)?
A low spot can occur at 0.002"-.003" and you will never see this in an un-inked plate.
Don't forget, the impression pressure is the total combination of plate, sticky back tape, plate cylinder or sleeve, and impression drum. In the first 3, it's location will not move.
#6 & 7 do have a harder edge, which would be the plate.
Thanks for the feedback.
These are on substrate. I will have to investigate if this is in the same location when it does happen.
Thanks for the info on 6 & 7, as well as the rest.
 

tsfx

Active member
Are these photos inked, on plate or substrate (#4 is)?
A low spot can occur at 0.002"-.003" and you will never see this in an un-inked plate.
Don't forget, the impression pressure is the total combination of plate, sticky back tape, plate cylinder or sleeve, and impression drum. In the first 3, it's location will not move.
#6 & 7 do have a harder edge, which would be the plate.
To add to this. I have reviewed how the plates were made and the process of the platemaker.
The only thing I can see, that might have been an issue with their process is when the plate backing is lied down with the liquid resin in between. There may have been points in which the backing was not coming out as straight as possible.

I believe this may have caused wrinkles. And therefore causing a low spot during the curing process. And being that they are new, they probably missed this prior to sending plates out to press.

Would you say these hard-edge, low spots could be created from this?
 

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