coating breaking up

[jerrybia]

we start a job, and check the strip to the blanket,4-5mm. after we run about 8 thousand sheets, it starts to break up in the middle. and the strips on the end are about 8mm and the middle is the same. the press is a 56 inch mitz with a harris bruno coater. the cylinders have a good strip to each other

 

[CD102]

Have you checked to make sure there aren't any lowspots on your cylinders? Are you running enough back pressure?

 

[lorrainepress]

I would check the loading pressure of the harris-bruno unit. On our 40" press we set it between 25 to 30 lb. of pressure depending on the age of the blade.

 

[Dean Graphic Services]

I would check the on/ off pivot pins on the hangers they get coating in them and hang up just enough to cause you pressure problems. I have pulled and cleaned the pivot pins with emory cloth greased well and re-install.

 

[madjock]

Maybe the blankets are being distored by the heat, I have had this happen before on Heidelbergs.

 

[tmason]

try using a torque wrench to tighten the blanket to spec. Are you coating over an ink that has a lot of wax in it?

 

[richard dm]

Did you ever solve this problem? I've been getting the same thing on a 28 ins mitz for 5-6 years!! Seems to be pressure related maybe, but why i don't know, or maybe heat?