Impressions - September 2013 - (Page 58)

tS Screen Printing Graphics & Design making it difficult for them to show up on a black shirt. Thus, it is more difficult to print an image that pops off the shirt. You’ll also find that when using simulated process separations and halftones, printing is easier than with vector art, and is much more forgiving when it comes to registration. With vector art, you need to make sure things line up exactly to prevent any gaps from showing. Or, in the case of black shirts, you don’t want any base white from peaking out from under a color along the edges. With this process if an image is slightly out of register, it’s less noticeable (see image at right). Halftones really are just a series of small dots lined up in rows within a linear inch. The number of dots in that linear inch equates to the “frequency” or line screen. As long as you have a printer and RIP software that will produce a proper sized dot required for screen printing, you can print designs using halftones. Three things you’ll have to know to set up a halftone screen are frequency (lpi), screen angle and shape. You will use the same frequency, screen angle and dot shape for all the colors that you print, including the base white. PRINTING TIPS Now that we’ve given you some insight into how to create an image that will work well on a black shirt, here are some tips on how to print it. We agree that this is a “Garbage in, garbage out” business. Remember that starting with bad art will never result in great printing. There are exceptions to every rule and, as an industry, we are learning more and more about mesh geometry. There are many methods to achieve a solid result. Based on the aforementioned halftone recommendations and for printing on a manual press, use the following mesh counts: 156 tpi (threads per inch) at 30-35 N/cm 2 for the white printer or underlay and 230 tpi at similar tension for all other colors, including highlight white — all with a standard thread diameter. 58 Impressions | September 2013 For automatics, additional detail and smoother transition areas, we may employ some thin thread technology or hightension methods. We would only flash and cool after the white printer. For the balance, try printing wet on wet. We rely on the colors blending to give us those transitions and the dimensional look. Proper stencil preparation is critical. The best stencil for halftone reproduction is a quality dual-cure emulsion. Though there are always exceptions, it typically has more latitude and is more forgiving than one-part photopolymer emulsions, which have a very fast exposure time. The proper stencil thickness also is important. Add that and the mesh thickness, and it has much to do with ink deposit. Exposure and development of the stencil will dictate the halftones we can and cannot hold on screen. We run exposure tests continually to identify which halftone levels are reproduced. When printing on a manual press, use sharp 70 durometer squeegees with as little pressure as possible to keep most of the ink on the surface of the shirt. For an automatic, use 65/95/65 or 75/95/75 triple-ply dual durometer squeegees set at a 15- to 20-degree angle with minimal pressure and a fairly quick stroke speed. Floods are used to fill the stencil with adequate speed and pressures. After initial registration, you need to do several strike-offs before getting close to accurate. After several prints, subsequent shirts’ colors should begin to look stronger and stronger until they level out. The colors shouldn’t change throughout the run until screens are wiped and the strike-off process may have to start over. The white printer or underbase probably is one of the most critical plates used on black shirts from a quality and productivity perspective. Pay particular attention to the white printer. You can get a gut feeling about the final print simply by evaluating the first white that is laid down and whether impressionsmag.com http://www.impressionsmag.com

Table of Contents for the Digital Edition of Impressions - September 2013

Impressions - September 2013
Contents
First Impressions
From the Show Director
FYI
Product Gallery
ISS Conferences
Outdoor Outfitting
Beat the Heat
Today’s Textile Ink Options
Shop Spotlight
Shop Spotlight
Embroidery Technique
Embroidery Production
Tech Tips Embroidery
Screen Printing Production
Screen Printing Graphics & Design
Screen Printing Technique
Online Directory
Tech Tips Screen Printing
Digital Decorating
Classifieds
Ad Index

Impressions - September 2013

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