Blow Molding Final Compatible
Transcript of Blow Molding Final Compatible
-
8/12/2019 Blow Molding Final Compatible
1/25
By Garrett Pritchyk,Bryant Richardson, and Mike Scesa
-
8/12/2019 Blow Molding Final Compatible
2/25
Polymer process that creates hollow plastic parts This process begins with melting down the
plastic that is to be blow molded in to a parison
Parison - in blow molding, the hollow tube of plastic melt extruded fromthe die head, and expanded within the mold cavity by air pressure toproduce the molded part.
Hot air blown into the parison forces it againstthe mold walls where it is then cooled
Mainly limited to processing of thermoplastics Most plastic bottles are processed this way There are three main types of blow molding
-
8/12/2019 Blow Molding Final Compatible
3/25
Process of blow molding originated fromblowing of glass then adapted to polymers
Evidence of Egyptians and Babylonians usingblow molding for plastics
Enoch Ferngren and William Koptike are thepeople credited for the process of blow molding Sold the first blow molding machine to Hartford
Empire Company in 1937
In the United States soft drink industry theamount of plastic containers went from zero in1977 to ten Billion in 1999. (Wikipedia.org)
-
8/12/2019 Blow Molding Final Compatible
4/25
-
8/12/2019 Blow Molding Final Compatible
5/25
Mass Range 0.005 - 0.3 kg
Range of section thickness 0.4 - 3 mm
Tolerance 0.25 - 1 mm
Roughness 0.2 - 1.6 m
Surface roughness Very Smooth
Medium Tooling Cost (relative)
Medium Equipment Cost (relative) Low Labor Intensity
Batch size can range from 500 - 50,000,000 units
-
8/12/2019 Blow Molding Final Compatible
6/25
Extrusion blow molding
Injection blow molding
Stretch blow molding
-
8/12/2019 Blow Molding Final Compatible
7/25
Begins with a parison/ pre-form and is thenplaced into an enclosed cooled metal mold
Then air is blown into this mold to shape thematerial to the desired shape
Once it is cooled the part is ejected from themold
Can be made continuously or intermittently
-
8/12/2019 Blow Molding Final Compatible
8/25
http://www.petmachine.in/images/pet_extrusion_blow_molding.gif
-
8/12/2019 Blow Molding Final Compatible
9/25
Shuttle Machinery
-Used to make large quantities of
product
-Size of mold can range from small
bottles up to 30 liter drums
-Multiple molds and parisons
-Very Important in making
bottles for food storage-Used for making containers
that need up to six layers
-Used for medical containers
-Blowpins are forced into the
molds to calibrate the parts
while forcing air into themolds
Rotary Blow molding
-
8/12/2019 Blow Molding Final Compatible
10/25
Reciprocating Screw
Machinery-Uses hydraulic pressure
to blow the mold-Used for making HDPE
dairy containers and five
gallon PC water cooler
containers
-Up to 8-head machines
for output of multiplecontainers
Accumulator Head Machinery
-An internal plunger uses
hydraulic pressure to blowthe mold
-Can make products with up
to 7 different layers of
materials
-Used to make gasonline
containers, playgroundequiptment, and other large
http://www.gefran.com/UserFiles/Image/So
lutions/Marzo_2008/Blow-Molding_eng.jpg
-
8/12/2019 Blow Molding Final Compatible
11/25
http://en.wikipedia.org/wiki/Blow_Molding
http://www.packagingmag.com.au/Uploads/PressReleases/p
ack/Images-
20080219/blow.jpg
-
8/12/2019 Blow Molding Final Compatible
12/25
Dairy containers (HDPE)Water Cooler Containers (PC)Medical Containers
Gasoline tanksPlayground EquipmentShampoo bottlesPipesHoses Industrial parts and drums
-
8/12/2019 Blow Molding Final Compatible
13/25
Polymer melt is supplied to mold halves from injectionmolding machine
Pre-form injection molded over a mandrel and transferredto the blowing die
Air is injected under pressure through the mandrelblowing the polymer against the mold walls where it coolsand freezes as with extrusion blow molding
-
8/12/2019 Blow Molding Final Compatible
14/25
Shear & temperature dependent viscosity Temperature-dependent tensile strength on
the pin Tensile elongation during inflation Crystallization kinetics on the core pin Crystallization kinetics during blowing and
cooling
-
8/12/2019 Blow Molding Final Compatible
15/25
Gives much bettercontrol over finishedcomponent weight and
wall thickness thanextrusion blow-molding
better precision in the
unblown, injection molded
neck areas, lending itselfto screw closures, etc.
Solid handles can bemolded in
http://www.global-b2b network.com/direct/dbimage/50069572/Injection_Blow_Molding_Machine_MSZ25.jpg
-
8/12/2019 Blow Molding Final Compatible
16/25
Injection molded preformed top IR heaters raise the pre-form above the glass
transition temperature Core rod stretches polymer to the bottom of
the mold High pressure air expands the polymer to the
walls of the mold
-
8/12/2019 Blow Molding Final Compatible
17/25
Single stage
Pre-form and blow molding process happen in the
same machine Convent for small batch production
Two stage
Pre-form is made in one machine
Blow molding occurs in another
Faster production for large batches
-
8/12/2019 Blow Molding Final Compatible
18/25
Low tool and die cost Fast production rate
Molds complex parts Stretching results in strain hardening Reduces product weight by 10% when
compared to similar methods Limited to hollow parts Wall thickness is hard to control
-
8/12/2019 Blow Molding Final Compatible
19/25
http://www.germes-online.com/direct/dbimage/50030644/Stretch_Blow_Molding_Machine.jpg
-
8/12/2019 Blow Molding Final Compatible
20/25
http://www.riken.go.jp/lab-www/mat-fab/blow/netpictures/petbottle/PET%20process.jpg
-
8/12/2019 Blow Molding Final Compatible
21/25
Lear Corp. & Fremont Plastic Molds
Ribbed parts are formed using specialized core
rod with ribs Increases friction for non-slip covers
Bayer Polymers
Flexible thermoplastics are blow molded over
metallic inserts in the die
Creates a hard and soft layer
Hybrid seats and cross-beams
-
8/12/2019 Blow Molding Final Compatible
22/25
http://www.ptonline.com/dp/zones/ptzones/index.cfm?cat=BLM01&zone=BLM
-
8/12/2019 Blow Molding Final Compatible
23/25
Thermoplastics PET
PC
HDPE
LDPE
PP
ABS
some PVC
Limited levels of reinforcement for compositematerials Thickness should be as uniform as possible to avoid
distortion
-
8/12/2019 Blow Molding Final Compatible
24/25
CES EduPack 2008 software, Granta Design Limited,Cambridge, UK, 2008.
www.blowmachines.com
www.wikipedia.org www.riken.go.jp/lab-www/mat-fab/blow/
-
8/12/2019 Blow Molding Final Compatible
25/25