Page 19 - SCREEN PRINTING FOR BEGINNERS
P. 19

Screens     are   best   stretched    with        Dyed     mesh      will   reduce      the
                    the     warp     and      weft    directly     refraction   and   light   travel   because
                    horizontal     and   vertical,   with   the    dyed    mesh     reduces    the   travel   of

                    warp    running    in   the   direction   of   ultraviolet   light.   Exposure   times   for
                    the    squeegee      stroke.   The   warp      dyed    mesh     will   be   50   to   100%
                    threads    will   be   able   to   hold   5   to  longer.   Dyed   mesh     is   the   best
                    15% more tension (Fig. 10)                     choice      for   detail    and      stencil
                    Mesh      fabric   is   available    in   a    sharpness. (Fig. 13)
                    calendered         form.     Calendered        Monofilament        polyester    mesh      is
                    mesh     is   a   product   with   one   or    available       in     several      thread
                    both     sides    flattened     at    their    diameters       and     mesh      opening

                    highest     point   in   the   weave     to    choices for each mesh thread count.
                    reduce  fabric  thickness  and  create         Standard  monofilament  polyester  is
                    a  level  profile.  (Fig.  11)  Calendered     joined   by   the   low-elongation      (LE)
                    mesh     has   reduced    open    area   in    mesh  fabrics.  Low  elongation  mesh
                    the  diameter  thread  available  and          provides    higher   tension    levels   and

                    is   unneeded       for   typical   textile    has   the   ability   to   maintain   stable
                    printing.                                      tension for longer print use.
                    Monofilament        polyester    mesh     is
                    available    in   white   and   dyed.   The
                    white    mesh    will   refract   light   past
                    the   stencil   edge    while   exposing
                    and    will   transmit   the   light   along
                                                                              Fig. 11 Calendered mesh
                    the  white  threads  in  the  same  way
                    fiber-optic    threads    will,   the   light
                    transmission     causes    undercutting
                    of the stencil. (Fig. 12).












                                                                        Fig. 12 Monofilament polyester mesh




















                     Fig. 10 Stretch screens with the warp running               Fig. 13 Dyed mesh
                                                                                                          17
                         the direction of the squeegee stroke
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