User login

Taking Control of Screen Coating

(May 2009) posted on Wed May 20, 2009

The stencils you use for printing are only as good as the coating procedures you follow to produce them. Here you


By KIWO Technical Support Department

click an image below to view slideshow

The degree of roughness of the stencil surface is measured as an Rz value. Basically, the lower the Rz value, the smoother the surface and, therefore, the better the seal that occurs between the substrate and stencil during printing. By adjusting the coating technique, users of direct emulsions can fine-tune the Rz value of their stencils for any particular substrate. Such adjustments are necessary to achieve accurate and consistent prints on all materials.

The key to proper gasketing between stencil and substrate is for the emulsion to provide a shoulder that maintains space between the substrate and the mesh in open areas of the stencil. Because ink cannot travel through mesh threads, having some emulsion thickness over (on top of) the mesh plane helps to define the edges of the image (Figure 1). (Figure Reference: EOM levels of 10-20% are generally recommended for screen printing (no more than 10% for process-color printing, particularly with UV inks. The extra emulsion thickness provides a shoulder at the mesh openings that keeps the mesh and substrate from making contact, which allows ink to transfer from the entire open area, leading to good image definition and dot shape and size.) Without this emulsion over mesh (EOM), the risk of sawtoothing and dot loss increases, and fine detail printing becomes virtually impossible.


Terms:

Comments

isaacbvrogelio says: ootahh viagra >:-[ cialis 9089 viagra >:]] viagra >:-[ cialis mXzEO cheap cialis 9271 posted on: Wed, 03/28/2012 - 11:11pm
isaacbvrogelio says: adeagdh viagra 2111 viagra qbTeC cialis FLPRz cialis 3285 posted on: Mon, 04/02/2012 - 11:55am
isaacbvrogelio says: aghyncvw viagra 8452 cialis KtCzsH viagra 4661 cheap viagra 1043 cialis >:-OOO cheap cialis 5204 posted on: Wed, 04/04/2012 - 3:07pm
isaacbvrogelio says: mioooy cialis IXAQj viagra >:-[ cheap cialis GSNasx viagra :-O cialis 8314 viagra >:-OOO posted on: Thu, 04/05/2012 - 6:20pm
isaacbvrogelio says: ctrlkkar fast payday advances >:]] pay day 8323 cheapest cigarettes >:-OOO payday loans 0723 posted on: Fri, 04/06/2012 - 11:36pm
isaacbvrogelio says: tkmnac cialis %-[[[ cheap cialis 9043 viagra 4343 buy viagra >:-OOO viagra 8624 cialis GDjJKP posted on: Sat, 04/14/2012 - 3:05pm
valeriei9 says: Totally free married sex dating Belmopan lifespan AWeber achlorhydria Biotic MaleExtra moveover smithy posted on: Mon, 04/23/2012 - 4:56am
isaacbvrogelio says: ibzkvlwy viagra >:-OOO cheap Cialis 2964 clomid yndUU propecia :-O generic zithromax 0172 posted on: Mon, 04/23/2012 - 5:03am
isaacbvrogelio says: dongcvgq payday loans =-] payday Canada :-O payday loans qCQnmc posted on: Thu, 04/26/2012 - 8:52am
isaacbvrogelio says: qvvxccu cialis :-O viagra 6678 generic viagra 1852 cheap cialis aVQJHK posted on: Fri, 04/27/2012 - 9:19am

Did you enjoy this article? Click here to subscribe to the magazine.