Screen Printing - PowerPoint PPT Presentation

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Screen Printing

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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 ... – PowerPoint PPT presentation

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Title: Screen Printing


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 (cont.)
  • 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 (cont.)
  • 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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