This technique is used for printing images or graphic models on different items as t-shirts, jackets, hats, etc. and on the most different materials as paper, plastics, textiles or metals. What makes the difference every time, depending on the specific base, is not the process but the ink. The first rule of silk screen is that the base material has to be plane.
The process is simple and consists in applying on the base material a layer of ink through a mesh. The printing can be done in one or more colors manually, automatic or semi-automatic. Polychromatic image can be done only on white materials and involves achieving color combinations by optical mixing the basic colors CMYK.
For darker materials the image is separated in more specific colors (up to 10 colors) with a basic white layer. These brighter colors give sharpness to the image.
The sizes of the imprint can vary from 0.5x0.5 cm to 40x55 cm.
There are some recommendations though:
• Trade mark TM or Registration mark ® won’t be visible under 2 mm height;
• Texts in positive must be greater than 2.5 mm height;
• Texts in negative must be greater than 3 mm height;
• The gradient thin texts are not possible/to avoid;
• The line thickness in positive must be greater than 0.25 mm;
• The line thickness in negative must be greater than 0.45 mm;
• The gradient line thickness must be greater than 1.5 pt (0.5 mm).
For printing on textiles the restrictions are:
• Texts in positive and negative must be greater than 5 mm;
• Line thickness in positive/negative must be greater than 0.35 mm.