1. Injection Moulding
v
Blow Moulding

2. What is Injection Moulding?
• Injection moulding is a manufacturing process
for making parts from thermoplastic materials
• Thermoplastics are materials, such as
polystyrene, that can be formed into different
shapes once heated and pressured in a mould
• An engineer/industrial designer will design
the desired product and then a mouldmaker
will make a mould from metal
• Used to manufacture a range of parts such as
body panels for cars

3. What is Blow Moulding?
• Blow moulding is a manufacturing process
similar to injection moulding
• Hollow plastic parts are formed through the
use of blow moulding

4. Main Differences
Injection Moulding Blow Moulding
• Makes solid parts • Makes hollow parts
• Thermoplastic is injected • Thermoplastic is a sheet/
into a mould parison that is pushed into a
mould by air
• A part’s thickness is
• A part’s thickness will differ
influenced by the mould and from place to place
core relationship
• 90% of the time spent on the
• 50% of the time spent on the
job is needed for making the job is needed for making the
mould mould

5. Main Differences
Injection Moulding Blow Moulding
• Minimising the presence of • As a hollow interior is
air in the injected plastic is a required, air is needed to
key concern force the plastic to expand
• The process may end in the
• When the plastic cools at the first mould or the air may be
end of the process the injected in another section
machine opens and the part of the machine
is released
• Parts tend to be solid plastic • Parts tend to be hollow
parts or components containers such as bottles

6. Injection Moulding

7. Blow Moulding
Extrusion Blow Moulding – one of 3 types of Blow Moulding

8. Finding a Contract Manufacturer
If you are looking for a contract
manufacturer who specialises in Plastic
Injection Moulding and Blow Moulding
consider a company that has ISO
accreditation.
Look for a company that has a short
physical distance from the delivery
point and a short lead time.
Offers additional services such as market
research and feasibility analysis.

9. Visit our website:
Injection Moulding Blow Moulding Plastic Moulding