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Screen Printing - PowerPoint PPT Presentation

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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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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
Applications for Screen Printing:
  • Posters
  • Plastic bottles
  • Drinking glasses
  • Soda bottles
  • Mirrors, metal surfaces
  • Wood
  • Textiles
  • Printed circuit boards
  • Product displays
  • Vinyl binders
advantages of screen printing
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
disadvantages of screen printing
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.
basic equipment for screen printing
Basic Equipment for Screen Printing:
  • Screen fabric
  • Frame
  • Stencil
  • Ink
  • Squeegee
  • Substrate
squeegee blades
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.
squeegee blade shapes con t
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.
screen inks
Screen Inks
  • Water Based
  • Oil Based
screen printing solvents
Screen Printing Solvents
  • Water
  • Mineral Spirits (or mineral spirits substitute)
screen frames
Screen Frames
  • Wood
  • Aluminum
  • Steel
  • Plastic
screen fabrics
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.
mesh count con t
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.
fabric strength
Fabric Strength
  • X
  • XX
  • XXX
  • Most screen printers select XX multifilament or
  • T- monofilament.
types of fabric
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
fabric attaching and tensioning
Fabric Attaching and Tensioning
  • Stapling
  • Cord and Groove
  • Mechanical Clamping
  • Adhesive Bonding
  • Measuring Fabric Tension - tensiometer
  • Fabric Treatment - abrading
  • Knife-cut stencils – Paper stencils, water-soluble stencils,lacquer-soluble stencils
  • Photographic Stencils – indirect, direct, direct/indirect
screen printing at pope
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.