Screen E-Book (.PDF) - MacDermid Autotype

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06Table ofContents07 The Theory BitGreat?Great <strong>Screen</strong> printer?The man with the magic fingersThe two Golden RulesPrinting 1-2-3Death to MythsWhy is 1-2-3 so important?21 Optional TheoryCalculating ink depositDesigning the perfect inkStopping slumpMesh markingRegistrationPrinting track on track44 Print Faults – making and fixingthemThe wrong stencilThe wrong meshToo fine a meshWrong ink – Drying inWrong ink – Viscous dragTear dropsNot clean enough – Ghost imageNot clean enough – DustOrange peelBelt marksRegistration issues51 Colour ShiftsFinding the best CMYK print order60 Getting the right exposureExposurePhoto-stencil sensitivityComparing exposurePoor contact with positiveUndercutting from a rough stencilComparing lamp age<strong>Autotype</strong> exposure calculatorExposure tips and tricks72 Solving Real ProblemsDirtStatic controlThe wrong meshImage too close to the framePoor cleaningEmulsion coatingDryingExposure controlStatic in printingThick edgesPositive sawtoothingDot gainNegative sawtoothingSkippingColour shiftsOn-off sawtoothingStencil X is better than Stencil YPoor quality linesMoiréPrinting very fine lines92 Moiré – causes and curesIntroduction. Where does moiré comefrom?Causes and cures for moiré – recipesfor successThe science of moiré – the reasons forthe recipes123134Problem Solving GuideMoiréSkippingMesh marks(Positive) SawtoothingNegative SawtoothingDark spots/HickiesLight spotsPrinted line/dot larger than positivePrinted line/dot smaller than positiveThick edges to printGlossary
Page 1 and 2: HowHow to be agreat ScreenprinterEd
Page 3: About this eBookI’m passionate ab
Page 8: The Theory BitNo-one likes theory.
Page 12 and 13: The Theory Bit12And some experience
Page 14 and 15: And that’s it. A nice, sharp, wel
Page 17 and 18: And that’s the 1-2-3 of screen pr
Page 19 and 20: explained why, in the speed ranges
Page 21 and 22: The Optional TheorySteven Abbott
Page 23 and 24: The total volume of this cube is:Th
Page 25 and 26: Designing the perfect inkNow we’r
Page 27 and 28: Suppose our flood bar is moving at
Page 29 and 30: (or equivalent) then the levelling
Page 31 and 32: The theory of spreading (often call
Page 33 and 34: Controlling slumpSo what can you do
Page 35 and 36: Mesh marking - causes and curesWe o
Page 37 and 38: For screen printers the important p
Page 39 and 40: Let me give a specific example so y
Page 41 and 42: To check out the calculation for PE
Page 43 and 44: the high-shear viscosity which need
Page 45 and 46: Like everyone, I get faults in my p
Page 47 and 48: All these lines should look like th
Page 49 and 50: How teardrops fall onto your printN
Page 51 and 52: Colour ShiftsTricia Church
Page 53 and 54: With a larger dot, there is much mo
Page 55 and 56: not perfect. However, careful inspe
Page 57 and 58:
grey, the Lab values of the printed
Page 59 and 60:
Caza finds, for example, that for h
Page 61 and 62:
You can have the best ink, the best
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As exposure time increases more of
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As the distance between the light s
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Here’s what can happen if the pos
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Comparing lamp ageAs lamps get olde
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Too far and your exposure times are
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Over the years we’ve built up a l
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Edge of the mesh, relatively high p
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The lower the solids, the higher th
Page 79 and 80:
With low squeegee pressure and this
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The rule is to use a thin (low EOM)
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The reason the high-Rz gives such a
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At 100lpi we have exactly the same
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This is basic skipping. Generally y
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The explanation is simple. The prin
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ers. We no longer have fruitless de
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In 2003 we published a handbook exp
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Where does moiré come from?The hum
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Fig iv. Moiré from twocircular pat
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OK. Use the smallest possible threa
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SymptomsOnly seen when you print th
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3c. PostScript bandingSymptomsBands
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Moiré characteristicsThere are thr
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This Rule of 4 has some important e
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Figure 3 The same meshand screen as
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Figure 5 shows that the lpi and ang
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disappear with the other three colo
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If you do the calculations, you fin
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amplitude of the effect in a single
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If you are seeing this moiré on a
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dence that poor-quality screens (hi
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Problem solving Guide
Page 125 and 126:
Under magnification the dots have n
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4. Stepping caused by image angle t
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StaticPresence of static will cause
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5. Over exposure.Poor washout of th
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Solution1. Earth the press.2. Raise
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MacDermid Autotype DSPThe MacDermid
Page 137 and 138:
a drop of water will form a drop wi
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