June '15

For the Business of Apparel Decorating

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2 0 1 5 J U N E P R I N T W E A R || 71 mid-range color information, referred to as a choke plate. This type of separation re- tains the design detail yet helps the colors pop. This also enables the printer to work wet-on-wet for the overprint colors. Given the art, the more lines per inch you can expose on a screen, the better. Typically, the best practice is a 50- to 55-line count. You can print water-based ink at a maxi- mum 305 mesh to create high-definition prints with good color accuracy; however, given the minimal dot gain of water-based ink, a 230 mesh gives the desired high-res look to the print. On simulated process prints, the most effective rotation is full plate, to flash and cool, to choke plate, to flash and cool. All subsequent colors are then printed wet-on- wet. The use of a retarder additive into the white underbase white greatly enhances the setup and production of the job by keeping the screen open. Art created in vector programs, such as Il- lustrator or CorelDRAW, are separated like traditional separations. Most changes occur in the color rotation on press. Designers must be aware of the need for additional flashing, which occupies two heads for each flash. Artists must also be mindful of which colors should be last in a rotation or before a flash because of opacity and pickup issues. If planned correctly, you can print as many as four colors of water-based ink wet-on-wet with vector designs. Decisions on which colors can be stepped on may be based on which colors are less important or which are smaller area colors in a design. In designs with many colors, the rotation may need a series of mini rotations between multiple flashes. For instance, if red and blue are the important colors in a design, you may choose to have a rotation of white, flash and cool, yellow, green, red, flash and cool, orange, purple, and blue. For separations with multiple colors with both dark and bright overprint colors, a two-plate underbase is recommended. The first plate has all information from the de- sign, referred to as full plate, followed by a secondary plate that has the white, light, and bright colors included, dropping the dark, deep colors. The underbase plate may not always be a white plate. In many cases, depending on the overprint color intensity or shade, the full base plate is a neutral base, a based back, mixing white, or high-opacity white. See Table 1 on page 72 for an example. Water-based ink is less opaque than plastisol. This property presents another set of problems for the printer, but prov- During the addition of the components into the formula, completely mix it before printing. The un- mixed pigments may result in inaccurate color or stripes and specks in the ink. Far left: Many of the halftone programs create an underbase plate that provides more white information under light colors and less white information under dark colors. (All images courtesy PolyOne) Left: Once the Tonal range is established, the subsequent colors can be printed wet-on-wet with excellent results. TO ADVERTISE CONTACT DIANE GILBERT AT 800-669-0424, EXT. 297 DGILBERT@NBM.COM DISPLAY ADVERTISING The Marketplace

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