Davis explains why you should resist the temptation to overload your mesh inventory and discusses ways you can make the most of what you already have.
By Rick Davis
I currently use these four mesh counts for virtually all of my printing, and I handle 90% of that with 125- and 230-thread/in. mesh. Needless to say, my mesh inventory is minimal. Identifying your primary mesh needs enables you to narrow your selection to those you actually bring to press and prevents the need to keep yards of expensive mesh you most likely will not use.
Controlling ink film
I keep a few 200-thread/in. screens on hand and most often use them for controlling wet-on-wet overprints for light or medium-shaded garments. I print all the colors of a multicolor graphic through 230-thread/in. mesh, which allows for good coverage and maintaining a soft hand. I then use the 200-thread/in. mesh for trapping black outlines. The reason is that the 200-thread/in. mesh will deposit an ink film that will easily cover the ink films previously printed through the 230-thread/in. mesh, leaving a crisp edge without adversely affecting the hand of the print.
Simple tricks like these will make your life easier when you use manual screen-printing equipment. You can also use the 200- or 230-thread/in. mesh counts for your highlight whites when printing on dark garments, where you still need a bump plate for white ink films or to back up underbase prints. Even though manual machines can't really reproduce graphics with the same consistency as automatic screen presses, the right manipulation of mesh counts and inks will help you print at nearly the same quality.
The next part of controlling the variety of mesh you stock is ensuring that you get the most use possible out of every screen you bring to press. You have two big considerations to keep in mind. The first is knowing how to control your screen tension; the second is how to properly handle those screens.
I use retensionable screens most of the time because they help me produce the best print possible with the softest hand. The benefits of retensionable screens are well known to most, although very few of those who use manual screen-printing equipment use them. The greatest advantage for the manual printer is the degree of difficulty that the retensionable screens remove from the manual screen-printing process. High-tension screens allow for lower off-contact and less squeegee pressure to properly deposit the ink film onto the substrates. This equates to less effort required during the printing process and, consequently, greater productivity.
Increased screen longevity is another big benefit of using highly tensioned mesh on a retensionable frame. Many garment-printing facilities that use manual equipment stock their storage racks full of tubular-aluminum or wooden frames. These frames may have their uses in manual screen printing, but the simple truth is that the tension of screens stretched on these types of frames will eventually drop to the point where printing quality will suffer. The effort required to properly print with these screens will not be worth the initial savings, and you'll waste valuable time removing the mesh and either restretching it or replacing the mesh altogether. Retensionable frames allow you to maintain your initial (or higher) screen tension and greatly extend the life of the mesh.
Proper handling is, perhaps, the greatest challenge associated with retensionable frames for screen printing. High-tension screens will rip as easily—if not more so—than low-tension screens, so printers must handle high-tension screens with an additional degree of care. You may need to provide your employees with additional training to make sure they understand the benefits of using retensionables, the appropriate ways to handle high-tension screens, and the techniques that increase the longevity of the tensioned screens.
Having a generous assortment of mesh materials in inventory may be a luxury to some shops and a necessity in others, but many facilities are simply not equipped to fully take advantage of such a broad selection. Instead of worrying about stocking every mesh known to man, concentrate instead on keeping and managing the mesh types that you need the most. Doing so will help minimize your overhead and maximize your productivity.
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