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Screen Printing

Chapter 23. Screen Printing. Screen Printing. The process of forcing ink through a porous fabric (screen) and the open areas of a stencil to produce an image Serigraphy, mitograph, silk screen, stencil printing, screen process Serigraphy- fine arts Screen Printing- g raphic c ommunications.

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Screen Printing

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  1. Chapter 23 Screen Printing

  2. Screen Printing • The process of forcing ink through a porous fabric (screen) and the open areas of a stencil to produce an image • Serigraphy, mitograph, silk screen, stencil printing, screen process • Serigraphy- fine arts • Screen Printing- graphic communications

  3. Screen Printing Simple Process Complex Process • Few inexpensive tools and materials • Array of sophisticated equipment and production techniques • Complexity • Level of quality required in finished piece

  4. Applications • Posters, plastic bottles, drinking glasses, soda bottles, mirrors, metal surfaces, wood, textiles, printed circuit boards, product displays, vinyl binders, etc

  5. Versatile Process • Advantages: wide variety of substrates, easy production process, low capital expenditures, decorative finishes, resilient ink film • Disadvantages: process is limited to flat, thin substrates, slow rate of production, poor ink mileage, excessive drying times, difficult to print details and fine line images

  6. Screen Printing Process • Equipment: screen fabric, frame, stencil, ink, squeegee, substrate • Porous fabric is stretched across frame • Stencil is adhered to fabric blocking out portions and leaving open the desired image area

  7. Ink is poured onto fabric and forced through image area using a squeegee • Ink is deposited on substrate, producing image of cut stencil • Multiple prints are created by repeating the process on new substrates

  8. Photographic Stencils • Light sensitive • Exposed using a positive film image • Right-reading on emulsion side • Indirect: exposed off the screen fabric • Direct: exposed after a light-sensitive emulsion has been applied to screen frame • Direct-Indirect: combination of the two stencil techniques and materials

  9. Diazo Emulsion • Used with water-based or solvent-soluble inks • Applied with scoop coater to both sides of screen • Substrate side of emulsion should be smooth • Exposure is made with a deep-bottom vacuum frame • Positive is positioned on substrate side and should be in contact with screen emulsion • Exposure to light causes areas to harden and become insoluble in water • Unexposed area will be washed away • Blockout can be applied to fill in pinholes and other uncoated areas • Emulsion is removed using a reclaiming solution

  10. Screen Preparation

  11. Screen Exposure

  12. One Color Printing Process

  13. Screen Clean Up

  14. Review Questions What are some typical applications of screen printing? What are some advantages of screen printing? What are some disadvantages of screen printing? Describe the basic screen printing process. When using a Diazo emulsion, how should the positive be positioned?

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