Digital BW, The Print

I would expect a smooth rod to cause all kinds of problems such as 
areas with almost no coverage and a large pool of material being forced 
ahead of the rod. The grooves are actually good practice. The main 
issue is the leveling properties of the coating material. The Mayer rod 
would push excess material ahead of it; however, the groves allow 
sufficient material to get under the rod. During setting and drying, 
the material should flow together into a smooth, uniformly thick layer. 
This is the technique used when plywood panels are coated with epoxy to 
waterproof and stabilize the top ply. In fact "WEST" (a epoxy system 
used in wooden boat building) sells spreaders with notches cut in the 
edge just for this purpose.

Jim
San Diego CA

On Monday, September 23, 2002, at 10:00 AM, Mark Tucker wrote:

> --- In DigitalBlackandWhiteThePrint@y..., "Paul Roark" 
> <paul.roark@v...> wrote:
> > > ... "Mayer Rod" ... I'm curious to see what it looks like.
> >
> > See: http://www.buschmancorp.com/faq.asp  for a good diagram.
>
>
> Surely, the Mayer rod is not what this says it is:
>
> "What is a wire-wound metering rod?
> A wire-wound metering rod, often called a mayer rod after it's 
> inventor, Charles
> Mayer, is a stainless steel rod around which stainless steel wire is 
> tightly
> wrapped. The wound wire creates a thread that is always the same 
> profile (a half
> circle). Wire size is determined by the diameter of wire wrapped 
> around the rod.
> These rods are usually chrome plated to extend working life. 
> Wire-wound rods
> are used on coating machines to apply pigments and other coatings onto 
> various
> web surfaces."
>
> I pictured the Mayer Rod as more like what they call a Smoothing Rod, 
> which is
> the next one down on that page. Seems like their Mayer rod would leave 
> the
> groove marks on the print.
>
> MT
>
>
>
<image.tiff>
>
>
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