| Summary: | 碩士 === 文化大學 === 造紙印刷研究所 === 83 === This study to examine tone reproduction affected by squeegee
angle in the screen printing process. The purpose of this study
is to find how thesqueegee angle influence on the tone
reproduction qualities in screen printing process. The tone
reproduction qualities'' items including SID(solid ink density)
、 TTD(totaltinedensity),tone reproduction curve ,DG(dot gain)
and PC(printcontrast). We examined tone reproduction affected
by squeegee angle in the screen printing process with statistic
methods，in order to achieve the goal of controlling the tone
reproduction by controlling the squeegee angle， the napproach
the final goal of printing quality control. Conclusions of
research as follow 1.Squeegee angle has significant influence
on TTD, DG and PC. 2.Squeegee angle is negative relation with
TTD and DG, but is positive relation with PC. 3.Under different
Squeegee angle, plate-press curve show S-shape. It exists quite
difference from U-shape of ideal plate-press curves. Plate-
Press curves downward with angle increase, but It shows a
constant tendency. 4.Best regression model is y=b0+b1x1+b2x2+b3
x3+b4x4. 5 Squeegee angle between 60~85 degree, the variation
of TTD and PC is constantly. Squeegee angle between 60~80
degree, the variation of DG is constantly. So，angle between
60~80 degree is suitable for screen printing. 6.DG Maximum
point moves from 50% dot area to 60% area with angle increase
and then fixes at 60% dot area.
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