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Thanks for all the suggestions. We are currently printing on the blue on the first unit ( we are using a two colour press ) with no ink / impression on the second unit. I do see the blue ink building up on the blanket of the second unit.

We are printing the yellow spot color on top of the blue. The area where the yellow print would go is "whited out" on the blue print so the two colours only overlap each other in the areas where there is trapping. Our press is a two colour press.

We would normally run the yellow ( lighter coverage ) on the first unit followed by the blue ( heavier coverage ). If we do this there is no problem with ink migration. However, we have problem with our second unit ( visible whitish bars during printing ) which forced me to try switching the...

We are printing a blue spot color ( about 80% coverage ) on first unit and a yellow spot color ( about 5% coverage ) on the second unit. As they are printing, the yellow print is coming out greenish. When they are printed seperately, the yellow and blue print out alright. Our press operator...

What are the best ways to minimize curling of laminated boards? Here is our process : We are currently using two layers of chipboard with a cross grain direction [ middle layer ]. After this we glue a sheet of paperboard ( clay coated newback ) to one of the sides [backing]. We allow it to...

Torque Torque What torque do you normally use on your blankets?

The reason why I am asking is because on our sheet the print is in register on the sides but as you go towards the center of the sheet it starts to go out of register. When they reversed the plate clamp the center part of the sheet was in register but the sides are no longer in register.

Is there a specific orientation for the plate clamp bars on an old Heidelberg SORDZ ( circa 1970's )? Our operator took out the plate clamp bar and "reversed it" so that what was orignally at the tail end of the plate now grips the front end of the plate. Thanks.

Just wonder what type of torque wrench should we get for our blankets? Thanks.

Our presses are using a conventional dampening system with a nylon based molleton dampening cover. According to our operator, the dampening cover we are using is "too slippery" when wet making it difficult for him to control the water during the press run. Does anyone have this sample problem...

Underblanket vs calibrated kraft paper. Underblanket vs calibrated kraft paper. We run spot colours and paperboards but use calibrated kraft paper ( even on the press that specifies an underblanket ). What are the advantanges of presses that have an underblanket and one that doesn't have...

What's difference between an underblanket and a regular blanket?

Differentiate between Calcium build up or Paper build up? Differentiate between Calcium build up or Paper build up? How would you differentiate between whether it is a calcium build up or a paper build up? The problem of the white build up does occur for our long run jobs ( or jobs which uses...

This normally happens when we use a particular ink supplier. When we use a different ink the problem seems to go away. We are currently using DS Chemport's roller and blanket wash. For our fountain solution we are using VARN's SUPREME 7086. We'll try using a decalcifier to if it solves the...

After cleaning the rollers we've notice that there is a hard smooth white deposit on the rollers. The only way was can remove them is if we use a deglazer. I've included pictures of what the rollers look like. Does anyone know what the cause is and how to prevent it? Thanks.

Thanks. I'll double check with to see if my supplier can do that for me. My only concern is that they may sometimes loose spacers or bearings if they are already attached to the roller when we send them to have the roller recovered ( this had happened before ). But in cases where we need to...

When we get a new set rollers it comes to us without the spacers and bearings attached. What's the best way to press the bearings onto the rollers? Thanks.

Does anyone know where I can find instructions on how to make a proper colour viewing station from scratch? I remember seeing the specifications in a book awhile back but I can't seem to find it or any references on the Internet. We are planning on either making one ourselves or purchasing a...

We were having problems using the VARN COATED MEDIUM and VARN REGULAR MEDIUM ( 20 to 40 microns ) spray powder for our machines. Whenever we are use these powders they would clog up our spray powder heads. After switching to VARN Fine ( 10 to 20 microns ) the problem went away but we've...

Re: Prevent inks from changing colour when drying. Thanks for the suggestions. We are still trying to get to the bottom of the problem. Does the anti-offset powder change the colour of the inks when drying?