Gummy SP-20 rollers

After acquiring, I did a thorough clean-up the ink rollers on my SP-20. That was months ago, and they have remained somewhat gummy, tacky to the touch. At first I thought it was due to the humidity, but that’s no longer an issue. They were pretty crudded up & I gave them a good scrubbing using cotton rags and paint thinner. Is that the problem? Is there another solvent that’s better to use in future, and is there a solvent I can use now to retard the tackiness & keep them clean and dry?
Thanks!

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chax
chax
9 years ago

OK, this sounds like the problem I have right now, except mine are “just tacky” and definitely not oozing. And this did not begin to happen until printing silver metallic ink awhile back. Since then I’ve cleaned and cleaned, with mineral spirits, and lately with Crisco, and they are still tacky. Are these beginning to go? Should I replace the rollers? Next cleanup attempt will be with Easy Street, which I just ordered. Is that likely to help? Thanks for your answers.

Paul Moxon, Moderator
Admin
10 years ago

The best available material is Nitrile rubber, a synthetic , commonly also known as Buna-N. It is stable and resistant to oils and acids. This material spec’d by NA graphics and all other suppliers.

Eric Holub
Editor
10 years ago

It is time for new rollers. Nothing you do will improve the quality of inking with the failing rubber you have, but new rubber will make a huge difference, assuming the rollers are made for letterpress.

Paul Moxon, Moderator
Admin
10 years ago

A photo would help. Are they just tacky or are they oozing. They could be old urethane roller, in which case, they will melt onto the ink drum and bed. This is a sticky mess. Get them off the press while you investigate further.

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