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Screen Printing

Screen Printing. The process of forcing ink through a porous fabric and the open areas of a stencil to produce an image. Two terms commonly used: Serigraphy (in the field of fine arts) and Screen Printing used in the graphic communications industry. Applications for Screen Printing:. Posters

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Screen Printing

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  1. Screen Printing

  2. The process of forcing ink through a porous fabric and the open areas of a stencil to produce an image.

  3. Two terms commonly used: Serigraphy (in the field of fine arts) and Screen Printing used in the graphic communications industry.

  4. Applications for Screen Printing: • Posters • Plastic bottles • Drinking glasses • Soda bottles • Mirrors, metal surfaces • Wood • Textiles • Printed circuit boards • Product displays • Vinyl binders

  5. Advantages of Screen Printing • Images can be printed on a wide variety of substrates • The production process is relatively easy. • Capital expenditures are low compared to other printing processes • Images can be printed with glitter, flock, and other decorative finishes. • The ink film is very resilient due to the extreme thickness of the ink deposit

  6. Disadvantages of Screen Printing • The process is usually limited to flat, relatively thin substrates, such as paper, metal, or plastic. • Rate of production is slow. • Ink mileage is poor. • Excessive drying times may be necessary. • Details and fine line images may be difficult to print.

  7. Basic Equipment for Screen Printing: • Screen fabric • Frame • Stencil • Ink • Squeegee • Substrate

  8. Squeegee blades • Square edged: flat surfaces and general purpose printing • Square-edge with round corners: Gives extra-heavy ink deposits on flat substrates. Used when a light color will be printed on a dark substrate. • Round-edge: Used primarily in textile printing where an extra-heavy ink film is required. • Single-sided beveled edge: Used for printing on glass.

  9. Squeegee Blade Shapes (con’t.) • Double-sided beveled edge with flat point. Used for printing on ceramics • Double-sided beveled edge. Used for printing on cylindrical objects such as bottles and containers.

  10. Squeegee Blade Shapes

  11. Screen Inks • Water Based • Oil Based

  12. Screen Printing Solvents • Water • Mineral Spirits (or mineral spirits substitute)

  13. Screen Frames • Wood • Aluminum • Steel • Plastic

  14. Screen Fabrics • Filaments are threads • Multifilament – sewing thread example • Monofilament – fishing line example • Mesh count = number of threads per linear inch • The higher the mesh count, the better the reproduction of fine details.

  15. Mesh Count (con’t.) • Multifilament ranges from 5 to 25. Multiply the digit by 10 to get an approximate number of threads per linear inch. • Monofilament are specified by actual number of threads per linear inch.

  16. Fabric Strength • X • XX • XXX • Most screen printers select XX multifilament or • T- monofilament.

  17. Types of Fabric • Silk - most expensive • Organdy - cheapest • Polyester - middle of the road • Nylon - used for non-flat substrates • Metal Mesh - most durable, but expensive • Metalized Polyester - durable but not too expensive

  18. Fabric Attaching and Tensioning • Stapling • Cord and Groove • Mechanical Clamping • Adhesive Bonding • Measuring Fabric Tension - tensiometer • Fabric Treatment - abrading

  19. Stencils • Knife-cut stencils – Paper stencils, water-soluble stencils,lacquer-soluble stencils • Photographic Stencils – indirect, direct, direct/indirect

  20. Screen Printing at Pope • Aluminum Roller Frames • XX, monofilament, polyester mesh • Photographic direct emulsion • Plastisol (oil based) ink • Mineral spirits substitute • Emulsion removed and screen cleaned with special solvents and water.

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