landing mark??

mrheidelberg · Dec 16, 2011

peterh said: ↑

hi giys,

i have checked all suggestions so far but found nothing really,anybody can suggest anything else.?
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Hi Peter,

I have seen this issue before on the CD 74 (a while back) . Will dig my CD74 notes out and see if i can shed some light on the issue.

Regards.

peterh · Dec 29, 2011

that would be great,if you can shed some light,as i said heidelberg have got no idea what is causing this,they even want me to change all the jackets to see in case its that,at £1100 each plus fitting,my arse...

Komcandl · Apr 19, 2018

peterh said: ↑

hi guys,

we have run our cd 74 5 now for 9 months but are still having an issue

peterh said: ↑

hi guys,

we have run our cd 74 5 now for 9 months but are still having an issue with a mark we cannot get rid of,it seems like a landing mark in the delivery but we have tried everything and we cannot get rid,we have had a heidelberg uk demonstrator in for a full day and he could not get rid of it either,he seemed to think it was a landing mark and that the air in the delivery looked too harsh,we have tried to run with no air at all but it still is there,it does not seem to happen on paper above 200 gsm,we have had a heidelberg uk engineer in on a follow up to the demonstrator but again he could not solve it,he said all timings on the grippers were set correctly and the sheet release was also correct.the mark always seems to have a curved sort of shape,we have checked all basic things like if its picking up the mark through the press etc and of couse so did the demonstrator,the mark is normally in from the edges about 4 inches and is also about the same from front of sheet but is random in size and postion which sort of rules out the picking up through the press,the appearance looks very similar to the marks on our transfer jacket after the perfector but i dont think its this as it moves about,i know its not ink /water as we have tried lots of different inks including heildebergs own and we have had a chemist in to check water etc,we are runing to iso 12647 so again i know we are putting the correct amount of ink down,the press prints fantastic and the ink dries very quickly whilst in the stack,the machine does not have a coater and heidelberg have told me that they have not sold many like this but i cannot believe the they woukld make a machine that cannot deliver a sheet without marking,the delivery is the the new xl 75 type so for the life of me i cannot resolve this,any body seen anything o theirs and found a cure,
cheers for any help
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with a mark we cannot get rid of,it seems like a landing mark in the delivery but we have tried everything and we cannot get rid,we have had a heidelberg uk demonstrator in for a full day and he could not get rid of it either,he seemed to think it was a landing mark and that the air in the delivery looked too harsh,we have tried to run with no air at all but it still is there,it does not seem to happen on paper above 200 gsm,we have had a heidelberg uk engineer in on a follow up to the demonstrator but again he could not solve it,he said all timings on the grippers were set correctly and the sheet release was also correct.the mark always seems to have a curved sort of shape,we have checked all basic things like if its picking up the mark through the press etc and of couse so did the demonstrator,the mark is normally in from the edges about 4 inches and is also about the same from front of sheet but is random in size and postion which sort of rules out the picking up through the press,the appearance looks very similar to the marks on our transfer jacket after the perfector but i dont think its this as it moves about,i know its not ink /water as we have tried lots of different inks including heildebergs own and we have had a chemist in to check water etc,we are runing to iso 12647 so again i know we are putting the correct amount of ink down,the press prints fantastic and the ink dries very quickly whilst in the stack,the machine does not have a coater and heidelberg have told me that they have not sold many like this but i cannot believe the they woukld make a machine that cannot deliver a sheet without marking,the delivery is the the new xl 75 type so for the life of me i cannot resolve this,any body seen anything o theirs and found a
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Hello hope someone sees this. I'm new to this site, so far complicated. I'm In my first year as lead op on a 09 komori ls29 p. What seems to be happening is after sheet leaves coating unit into extended delivery the sheet whips and hits the dryer lamp (cover) and makes what looks like transfer cylinder marks. I'm gonna start by cleaning tunnel best I can and see if any air nozzles are plugged. With coating powder ext. if this is just going to one person could you please post this to everyone. I still gotta figure this site out

asem alsafady · Apr 23, 2018

Dear Peter,
If the problem is still on, please send us clear videos or photos. I used to be a printer at XL75-5 for more than 5years.

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landing mark??

mrheidelberg Senior Member

peterh Senior Member

Komcandl New Member

asem alsafady Senior Member

The problem is that the watermark does not appear after printing

Roller marks coming across the sheet for starting few sheets

Aftermarket IR Dryer systems

Sm52-2 straight 3 marks are ok the 4 is not ok

Water Mark on the image area