Download - Cetak Plastik OK
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Cetak Plastik Cetak Plastik
Plastics Injection MoldingPlastics Injection Molding
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Sejarah Plastik
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Jenis
plastik/polimer
Thermoset Thermoplastic
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Sifat Umum: tahan lama, keras, tangguh, ringan.
Thermoset
Contoh:
Polyester: lacquers, varnishes, perahu, furniture
Epoxy dan Resin: lem, coating untuk electrical circuits,
composite: fiberglass baling-baling helicopter, perahu
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Elastomer
Sifat Umum: thermoset, seperti sifat karet
Contoh:
Polyurethan: matras, cushion, insulation, mainan
Silicon: sarung tangan medis, masker, seal
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• umumnya thermosetting polymer
• mold dipanaskan dan ditutup dengan tekanan
• Plastik mengalir kedalam rongga
• perlu finishing
Peralatan makan, handel ketel, ski,
Casing untuk circuit breaker, sol sepatu,fiber-reinforced composite
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Sifat Umum: suhu leleh rendah, lunak, flexible
Contoh:
Polyethylene: packaging, electrical insulation, milk and waterbottles, packaging film
Polypropylene: carpet fibers, automotive bumpers, microwavecontainers, prosthetics
Polyvinyl chloride (PV: electrical cables cover, credit cards, carinstrument panels
Polystyrene: disposable spoons, forks, !tyrofoam"!crylics (P""!: polymethyl methacrylate: paints, fake fur,
plexiglassPolyamide (nylon#: textiles and fabrics, gears, bushing andwashers, bearings
PET (polyethylene terephthalate: bottles for acidic foods like #uices,food trays
PT$E $polytetrafluoroethylene: non-stick coating, %ore-&ex"
$raincoats, dental floss
Thermoplastik
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Proses Pen%olahan Plastik
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Extrusion
pelletsopen cross-sections (channels) closed cross-sections (tubes, pipes) pelletsopen cross-sections (channels) closed cross-sections (tubes, pipes)
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&lo' moldin%
heated glass
3-piece mold
(a) The hollow piece of heated glass (parison)
is first created by a blow mold
(see text-book Fig 1!"#)
(b) The mold is put together
(c) $lunger and hot air push the
glass up
(d) %ot air blows the glass out towards
the mold surface
(e) &old comes apart, bottle is remo'ed
heated glass
3-piece mold
(a) The hollow piece of heated glass (parison)
is first created by a blow mold
(see text-book Fig 1!"#)
(b) The mold is put together
(c) $lunger and hot air push the
glass up
(d) %ot air blows the glass out towards
the mold surface
(e) &old comes apart, bottle is remo'ed
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Thermoormin%
Lembaran plastik Pemanasan (lunak) Dicetak sesuai bentuk
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Vacuum thermoormin%
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ompression and Transer "oldin%
compression molding
transfer molding
$bentuk lebih rumit
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)njection "oldin%
- Paling banyak digunakan, penting, dan ekonomis.
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Skematik ProsesSkematik Proses ** "esin"esin
+
' !ource: http:((www.idsa-mp.org(proc(plastic(in#ection(in#ection)process.htm
+
Skematik mesin )njection moldin% thermoplastik
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Pen%aruh suhuPen%aruh suhu moldmold dandan
tekanan terhadap penyusutantekanan terhadap penyusutan
0.030
0.000
0.010
0.005
0.015
0.020
0.025
100 120 140 160 180 200 220 240
Mold Temperature (F)
LP! PP
"#lo$ 6%6
PMM&
&'etal
( ) r i $ k a *
e
0.030
0.000
0.010
0.005
0.015
0.020
0.025
( ) r i $ k a * e
6000
8000
10000
12000
14000
16000
Pressure o$ i$+e'tio$ plu$*er(psi)
&'etal
LP!
"#lo$6%6
PP
,it-o,
18000
PPa'ross
-o,
PMM&
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)njection "oldin%:
&entuk/%eometri "old
*omponen utama:
mold pieces $menentukan bentuk(geometri produk,
sprue, gates, runners, vents, ejection pins,cooling system
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)njection "oldin%: ,-piece and .-piece molds
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)njection "oldin%:mold den%an core er%erak dan side-action cam
- +ila bentuk(geometri ada undercuts
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Cait#Core
/ompo$e$ mold u$tuk /ompo$e$ mold u$tuk
produk 'a$*kir plastik produk 'a$*kir plastik
u$$erate
"ole
prue
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u$$er
Part
Cait#
"ole
Part
Cait#
/$o
(tripperplate
u$$er
Part
Cait#
"ole
u$$er
Part
Cait#
"ole
u$$er
Part
Cait#
"ole
Part
Cait#
/$o
(tripperplate
Part
Cait#
/$o
Part
Cait#
/$o
(tripperplate
u$$er
Part
Cait#
"ole
u$$er
Part
Cait#
"ole
Perancan%an injection mold : mold in action
[source: Lec notes, Prof T. Gutosky, MT!
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Perancan%an injection mold : itur-itur umum
[source: """.i#sa$mp.or%!
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(a) hut-off hole
no side action re*uired
(b) +atch
no side action re*uired
(c) ,ngled +atch
ide action cam re*uired
(a) hut-off hole
no side action re*uired
(b) +atch
no side action re*uired
(c) ,ngled +atch
ide action cam re*uired
Perancan%an injection mold : itur-itur umum
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0asar perancan%an produk injection moldin%
asar utama:$i aliran plastik ke seluruh bagian cavity sebelum mengeras$ii penyusutan plastik dalam lubang penyusut
Panduan (1#
sahakan penampang(ketebalan seragam seluruh bagian produk
ow: use of ribs(gussets
/source: %0 plastics: 1n#ection 2olding esign %uidelines3
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Panduan (,# indari penampang yang tebal
/source: %0 plastics: 1n#ection 2olding esign %uidelines3
0asar perancan%an produk injection moldin%
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Panduan (.# 4okasi gate menun#ukkan weld line
weld lines
' !ource: http:((www.idsa-mp.org(proc(plastic(in#ection(in#ection)des
0asar perancan%an produk injection moldin%
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eld li$e i$k mark eld li$e i$k mark
& 'ource: ttp:""" i#sa mp or%procplasticin*ectionin*ection #esi%n tm
eld li$e
&lira$ kedalam Mold
ate
Produk #* suda +adi
i$k mark Pera$'a$*a$ ris u$tuk
memi$imalka$ si$k mark