Toner Offsetting onto next sheet

Hi Guys,

Basically i am running 300gsm silk stock, 100% guaranteed by xerox SRA3 or XXL on igen 150. and when it comes out the stacker there are traces of toner on the sheet above. I then go to knock it up with no excessive force and more toner comes off onto the sheet above and makes it really noticable, basically if it was a litho press i would call it offset, but it's an igen so this should not happen.

Now we have had an engineer in for a day and a half and they are running out of ideas, will hopefully get an STS at some point.

tried/ discounted;
- new fuser
- its a very new pressure roll and problem started before it.
- temp for fuser an ext rolls have been increased.
- tried on other silk stocks and we get the same. bought xerox brand colour impressions silk and still the same.
- made sure it is going into heavy weight paper mode on fuser.

any ideas?

Plus i need to get a 10k Sheet job done this week on a heavy silk stock so I'm getting nervous that we won't be able to.

thanks in advance!

 

still no better after engineer changing all thermisters.

Please help!!!!

 

now i'm told, thats just how silk stock. been running iGens for 7 years now... can't say i've really noticed it, so news to me! also can't say that's in the customer expectations doc or as a caveat when being sold igens.

 

This is a dumb question but, did they check the fuser and external heat roll nip gaps?

 

i did the contact arcs (fuser and pressure roll) to start with, one of the first things i did when i changed the fuser early on in the process.

between fuser and the two ext heat rolls i'm not sure is the answer, but i think that was one of the things they check earlier, as they double checked the contact arc as well.

 

is this paper REALLY porous? or textured, I should say?

do you have a ton of buildup on your heat rollers?

I have a paper I use for a job with a THICK red strip across it, that the only way to avoid this... is to rotate the page every so often so the stripe is 180 the other side.. or toner will build up on the heat roller, eventually insulating it so it wont fuse at all.

also had this happen when ive used a too thick paper setting.....

try making a new substrate setting thats thinner....you might get more pressure...

just a thought.

 

This is 100% xerox guaranteed by the Europe RML, and is a good quality silk stock.

below link is what i was sent to by an engineer, it did make me laugh it was a post on here!

http://www.colorprintingforum.com/xerox-iGen/rub-off-silk-coated-stock-5977.html

 

hahaha I remember that thread.

 

We use the same stock as you and tend only to have a problem on EXP, which I run on a 350 gloss setting which seem to generate extra heat to help the fusing process.
I have to agree that the coating on the silk stock now seems to be more abrasive than it used to be.
with all the upheavel in European paper mills I don't know that its still made in the same mill.

 

Yeah silk/matte stocks are pretty aggressive on the fuser components etc. Was going to suggest like someone above said set it as a 350gsm gloss stock or even call it textured (get that ATA on to it). That may stop your toner from setting off. Also increase the heat roll contact to get a little more pressure.

I just ran a few hundred thousand Xerox 210gsm XXL silk sheets without much issue on our 150's. Just quicker heat roll wear.

 

Hi flangmasterj,

What specific xerox sheets were you running? the Colortech or Colour Impressions?

thanks,

affromonkey

 

if you can not get the stock to run try another brand.. we have had good results with hancuk xpi or futura!
only other thing I can add to the sugestions is to lower the amount of fuser oil.and increase roller pressure closer to the max of 15