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blow molding (advantages (short cycle (low cost), low molding cost than…
blow molding
advantages
low molding cost than injection molding
high production rate in producing hollow parts
short cycle
low cost
types
injection blow molding
extrusion blow molding
Co-extrusion blow molding
extruding 2 or more materials through a single die
advantage
specialized polymers
better barrier properties
recycled materials can be layered in the middle
less costly materials can be used in a layer to reduce the part's cost
shapes
hollow
cubic or cylindrical
daily products
ducts
trash carts
tanks
flower pots
barrels
double wall case
bottles
toys
process
fed in granular form into a hopper
large screw is turned by a motor which feeds the granules through a heated section.
the granules melt and become a liquid. the liquid is then fed into a mold
Air is forced into the mold which pushes the plastic to the internal sides of the mold, giving the shape of the bottle.
the mold is then cooled and is removed
material considerations
most thermoplastic
Polyolefins are the easiest to process
HDPE
PP
LDPE
EVA
PVC is temperature sensitive
PET & Polycarbonate(PC)