di press hickies

Hi Can anyone help i am having loads of trouble with hickies on the magenta unit ive tried all sorts of things from manually cleaning plate then a auto clean i run press for a 100 sheets and the dam things are back, i can do this all the way through a run any ideas PLEASE

 

clean the gap guards, plate vacuum, wash rollers up then hit them with warm water.always use fresh ink daily. check paper for dust. also clean the vac bags underneath. never use the plate washer to clean solids. always wash by hand.clean inside of safty guards

 

cheers for that, i have tried most of that but not the vac bags next i will take out all the rollers and give then a good going over. solids do cause me the most hassle cheers again

 

I had the same problem when I used Superior Aqua-not Magenta. I switched to a different brand and it is, for the most part, gone. Did not have a problem with the other colors.

 

Hi there , with hickies you must clean the rollers, put fresh ink in it.
Make sure that the paper is been cut with a sharp blade, not blund.
and What I do is always a cover sheet over the press when it,s not running.
And that,s helping to.
Good luck André

 

I had this problem once and what I discovered was the edges of my rollers were quite contaminated and had to pull each one out and thoroughly clean all of the dried ink off of each end. The dried ink on the ends were cracking and breaking off and getting into the rollers.

Cheers,

Tracy

 

You could try praying but am sure that wont work either. Engineers and demonstrators will tell you its down to cleanliness but its not,am afraid the best you can do is work as clean as possible(clean blankets by hand ) and persevere my friend. You could try changing inks,stock and put your press in a controlled environment but your hickies wont think any better of you ..kev c

 

Hickeys are caused by quite a few things. Here are some items that may
be of help:

1: Environment: Keep everything clean and free from dust. This includes
the guards, especially the one covering the first unit over the feeder.
This guard has a tendency to collect paper dust and powder on the
backside of it. Every time you close it, the dust goes into the first
unit ink rollers.

2: Clean the edges of the rollers free of dried ink. This involves
removing the rollers and cleaning them by hand periodically, preferably
once every other month. The dried ink chips off and causes hickeys.

3. Clean the gap guards frequently. Some people like to do it before
every plate burn; this is a personal preference issue but it does help
to keep the excess silicone from getting in your rollers. I recommend
they be cleaned a minimum of every 3 burns.

4. After burning large solids, clean the plate by hand then let the
press perform a full plate cleaning cycle. This is probably the most
important step to help prevent silicone from getting in the rollers.

5. Do not use a dull knife when cutting paper for the press. This
creates an excess of paper dust which will eventually end up in the
rollers.

6. Make sure all of your vacuum units are working properly. This means
cleaning the silicone bags out monthly. You can tell if a vacuum unit is
not working by removing one of the bags during a wash-up cycle. If no
air is blowing out the tube the bag attaches to, the unit may not be
functioning.

7. Clean the vacuum heads every night. Silicone gets trapped inside them
and can fall out into the press. An air hose blown inside them does an
adequate job. They should be removed every night during the wash-up
process to begin with; this presents a good opportunity to clean them.
Hickeys are a problem with any type of printing equipment. By
following the above steps, you should be able to keep them to a minimum.

8. Check your roller stripes to the distributor rollers. Sometimes one is not touching and never cleans up properly. Ink, paper trash and silicone start sticking to the offending roller and cause hickies.

 

9. do all this above and then still return to the hickies

 

I think it has to do with the British rainy weather, that some people doesn't believe the sun could shine again.
After perfectly input from Paul, I could only add the first unit's laser head issue.
I recommend to clean it regularly and leave thin oil film on the top surface. It keep the dust and dried ink from falling directly into the washing device and reduce the scratches and hickeys .
rgds
Jan