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Ink sticking to scree

Posted on Fri, 30 Apr 2004 at 15:00



I am presently trying to print on a dense foam type material, such that you will find on boats compartment lids. I am using "Solar White" by Wilflex. My problem is when I Lift the screen after squeeging on the ink I get sticky spots that cause the the print to be holey(not smooth). I think my biggest problem is not shearing the paint off, but I would like to have some feedback Please. I have 5000 units of these to print manually and I need to do each one with on sweep of the squeegy. Any help would be greatly appreciated.
Jim

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Comments

Anonymous says: Is the material covered with fabric or is it the actual foam you are printing on? It sounds to me like you need an air dry ink instead of a plastisol. 5,000 prints is alot to be printing manually. I would ...

Is the material covered with fabric or is it the actual foam you are printing on?

It sounds to me like you need an air dry ink instead of a plastisol. 5,000 prints is alot to be printing manually. I would get a new screen with a mesh of at least 230, call Nazdar (www.nazdar.com) and see what ink would work best for you and print away. You will need alot of space for drying. Depending on the ink, it may dry fast enough for you to stack them when you run out of room.

Good luck.

posted on: Fri, 04/30/2004 - 2:13pm
Anonymous says: We solved this problem many years ago when a salesman wondered into our shop with the very bold claim that if we used Rutland Plastisol we would not have any sticking problems. We tried several colors, ...

We solved this problem many years ago when a salesman wondered into our shop with the very bold claim that if we used Rutland Plastisol we would not have any sticking problems. We tried several colors, and the sticking stopped for all our multicolor printing. We are able to go 1000's of prints without stopping for sticking problems and cleaning. We use only Rutland these days. It might be worth a try for you to try some.

posted on: Mon, 05/03/2004 - 8:35am
Anonymous says: do you have space between you screen and your subrate so thet the scren bounces away from your subrate posted on: Wed, 06/02/2004 - 1:47am
Anonymous says: Jim, To me it sounds like a "SHEAR" issue. Do you need a lock down unit to stabilize the substrate? As far as the "pinholing" issue is concerned, if you have perfect substrate stability, that it is a ...

Jim,
To me it sounds like a "SHEAR" issue. Do you need a lock down unit to stabilize the substrate?
As far as the "pinholing" issue is concerned, if you have perfect substrate stability, that it is a "wetting" issue, the Ink is the wrong rheology, to short, but it is very rare to have that issue with screen printing inks.
Your best bet is to run high tension screens, with the right off-contact and the proper stencil thickness and RZ factor.
Not to many screen printing ink company's ship ink that is so tacky that it will not shear (stick to the screen) within normal operational parameters.
Good luck, Thomas Dunn thomasdunn13@comcast.net

posted on: Sun, 06/27/2004 - 1:57pm

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