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1.2 Overview of Printing Technologies. Ref. H. Kipphan, Handbook of Print Media: Technologies and Production Methods, Springer, 2001, sec 1.3, ch 2, ch 5. Overview of Printing Technologies. Two classes of printing technologies Technologies requiring a printing plate - PowerPoint PPT Presentation
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1.2 Overview of Printing Technologies
Ref. H. Kipphan, Handbook of Print Media: Technologies and Production Methods, Springer, 2001, sec 1.3, ch 2, ch 5
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Overview of Printing Technologies
Two classes of printing technologies Technologies requiring a printing plate
Flexography, gravure, screen printing, micro-contact printing
Technologies not requiring a printing plate
Inkjet printing, laser printing
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Letterpress/Flexographic Printing
Characteristic of letterpress printing is The printing elements of the printing plate are
raised above the non-printing elements Flexographic printing is a type of letterpress
printing where printing plate is soft Printing can be done on rough surfaces & on
fabrics
ink splitting, fig. 1.3-5fig. 1.3-9
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Letterpress/Flexographic Printing
Questions Why anilox roller was introduced for inking the
printing stamp? Can directly roll printing stamp through the ink tan
k do the job? Why the printing was done in the liquid phase,
not in the solid phase?
contd
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Gravure Printing
Characteristic of gravure printing is The image elements are engraved into the
printing cylinder
Schematic of gravure printing (fig. 1.3-10)
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Gravure Printing
Questions Why the inking here is done through
directly rolling over the ink tank? Why the printing is done in the liquid
phase?
contd
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Lithography or Offset Printing
Characteristic of lithography is The printing and non-printing areas of the printing pla
te are on the same level The printing areas are made “ink-philic” (親墨水 ) w
hile the non-printing areas are “ink-phobic” (不親墨水 ).
Lithography was invented by the end of 18th century (yr 1796)
“The image to be printed was drawn on the stone with a special liquid. The stone was dampened before it was inked up, after which the non-image areas of the stone surface did not take on ink.”
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Lithography or Offset Printing
Schematic of lithography/offset printing (fig. 1.3-18)contd
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Lithography or Offset Printing
Ink transfer of offset printing (fig. 2.1-8)contd
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Lithography or Offset Printing
Questions How were the patterns created on the
printing stamp at the first place? What is the purpose of the blanket roller? Why are multiple rollers used in the ink
delivery subsystem?
contd
multiple rollers
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Screen Printing
“… a process in which ink is forced through a screen.”
Fig. 1.3-22
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Ink-Jet Printing Continuous vs. drop-on-demand ink-jet printing
Fig. 1.3-30
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Micro-Contact Printing – Chemisorption
A specially designed letterpress printing Proposed by Whitesides et al. in 1993 based on S
AM (self assembled monolayer) technique(CP)
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Micro-Contact Printing – Chemisorption
2 steps of SAM process 1. Chemisorption of "head
groups" onto a substrate 2. Self organization of "tail
groups"
contd
http://en.wikipedia.org/wiki/Self_assembled_monolayer
Schematic of self-assembly mechanism for alkanethiols on Au(111).(A) Thiols adopt the highly mobile lattice-gas phase at very low coverage. (B) Above a critical value of surface coverage, striped phase islands, characterized by surface-aligned molecular axes, nucleate heterogeneously and grow in equilibrium with a constant-pressure lattice gas. (C) Surface reaches saturation coverage of striped phase. (D) Surface undergoes lateral-pressure-reduced solid-solid phase transition by nucleation of high-density islands at striped-phase domain boundaries. (E) High density islands grow at the expense of the striped phase until the surface reaches saturation.
G. E. Poirier and E. D. Pylant, “The self-assembly mechanism of alkanethiols on Au(111),” Science 272 (1996) 1145-1148
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Micro-Contact Printing – Chemisorption
Two classes of SAM: thiol-based and silane-basedcontd
http://personalpages.manchester.ac.uk/staff/Sven.Koehler/media/index.html
thiol-based SAM silane-based SAM
http://nanostructure.usc.edu/research/bio1.shtml
221
n2
n2
HAuS)CH(R
AuSH)CH(R
OHOSi)OH(Si)CH(R
)OH(Si)OH(Si)CH(R
22n2
3n2
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Micro-Contact Printing – Physisorption
Deficiency of chemisorption CP Applications limited by few choices of SAM pairs of mol
ecule and substrate Physisorption CP exploiting physical adsorption,
for example through van der Waals interaction
stampstamp
Inking-pad
inking-pad
stampstamp
(2) Contact-Inking
stamp
stampstamp
substrate
substrate
(3) Contact-Printing(1) Ink-Pad Preparation
inking
ink-padspin-coater
ink-padspin-coater
Source: 呂冠毅 , 中正大學機械所碩士論文 , 2010