Screen E-Book (.PDF) - MacDermid Autotype

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Problem solving GuideTechnical referenceSee ‘Getting the right exposure’ chapter.SolutionPositive and stencil surface must be cleanbefore exposure. Use a clean room wipe orTeknek roller.Printed line/dot larger than positiveDescriptionPrinted line/dot wider than positive.Cause1. Ink slump.2. Sawtooth.Technical reference1. See ‘Optional theory’ chapter.2. See ‘Problem solving in the real world’chapter.Solution1. Change the ink.2. See Sawtooth problem in this guide.Printed line/dot smaller than positiveDescriptionPrinted line/dot smaller than positive.CauseUndercutting causing reduced image sizeon the stencil.1. Wrong lamp geometry.Rz 4.52. Poor vaccum.3. Positive upside down.4. Backing sheet not removed.Rz 22.5130
5. Over exposure.Poor washout of the stencil causing reducedimage size of the stencil.1. Low washout pressure.2. Stencil fogged by heat or light.3. Low density positive.Technical referenceSee ‘Getting the right exposure’ chapter.Solution1. Optimise exposure conditions.2. Optimise washout conditions, moststencils will benefit from washing out witha high pressure gun from 1m distance.SolutionReduce the EOM of the stencil. Capillex CXand Capillex CP give controlled low EOMstencils designed to resolve this problem.Image distortionDescriptionUnable to register multicolour prints orchange in the size of the print across thestencil.CauseThick edges to printDescriptionThick image edge.CauseStencil EOM too high.Technical referenceSee ‘Problem solving in the real world’chapter.1. Off contact too high.2. Squeegee pressure too high.3. Image too close to the screen edge.4. <strong>Screen</strong>s of different tension.5. Too flexible mesh choice for the job.131
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HowHow to be agreat ScreenprinterEd
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About this eBookI’m passionate ab
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06Table ofContents07 The Theory Bit
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The wrong way: a strong-deep flood.
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why a light flood is recommended so
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This is the single most important f
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When I first pointed this out to my
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The Theory Bit20Why is the 1-2-3 so
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The mesh does the meteringThe 1-2-3
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This gives us the ‘real’ TIV fo
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simple, in-control process.Years of
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The Optional Theory28At the shear r
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I’ve come across examples in all
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The Optional TheoryOur 50µm line b
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oughness can slow slumping; it prob
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The Optional TheoryThe exact part o
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atches of the ‘same’ mesh. My f
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The Optional Theory40The industry r
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the screen frame itself to compensa
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Print Faults - Making and fixing th
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Print FaultsThey include tape marks
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Wrong ink - Too much viscous drag (
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DustPrint FaultsWe threw some dust
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What’s the best order to print yo
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Colour shifts54high-frequency (non-
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We formed our own (subjective) opin
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And the winner is...Colour shifts58
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Getting the right exposureAnna Harr
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Getting the right exposureThe light
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3/4 full exposureEFFECTS: Emulsion
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Getting the right exposureThere is
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Undercutting from a rough stencilSo
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Getting the right exposure(or numbe
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Solving problems in the real worldA
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Solving problemsThe simple act of r
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Emulsion coatingThe advice about cl
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Solving problemsA quick tip to help
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Page 82 and 83: Solving problemsThis screen-shot fr
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Page 86 and 87: Solving problemsThe root cause of n
Page 88 and 89: Now the ink fully fills the extra s
Page 90 and 91: Solving problems90Stencil X gives b
Page 92 and 93: Moiré, causes and curesSteven Abbo
Page 94 and 95: Moire, causes and cures94fluential
Page 96 and 97: Figure ii. The overlayedpattern fro
Page 98 and 99: Moire, causes and cures98Causes and
Page 100 and 101: 2 15° moiréIt’s an unfortunate
Page 102 and 103: Moire, causes and cureson top of an
Page 104 and 105: Ideal. Find a RIP with an option fo
Page 106 and 107: Moire, causes and curescan’t pick
Page 108 and 109: frequency tend to have a lower ampl
Page 110 and 111: Moire, causes and curesis a half-tr
Page 112 and 113: Incidentally, note that the ratio o
Page 114 and 115: Moire, causes and cures114So, surpr
Page 116 and 117: grid) in a conventional set that wa
Page 118 and 119: Moire, causes and cures118what this
Page 120 and 121: Arguably the skipping takes place p
Page 122 and 123: Moire, causes and curesSummaryAs Ma
Page 124 and 125: MoiréDescriptionAn unexpected patt
Page 126 and 127: Problem solving GuideCause1. The mo
Page 128 and 129: Dark spots / HickiesDescriptionDark
Page 132 and 133: 6. Substrate unstable.7. Changes in
Page 134 and 135: Glossary of terms used in this eBoo
Page 136 and 137: Glossary136Moiré amplitudeThe ampl
Page 138: A Macdermid Autotype HowTo eBookEdi
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