Thin wall injection molding is now the fastest developing molding technology for house hold containers .

1. Thin wall injecTion
molding
NAIK DEVANG

2. why design wiTh PlasTic ?
• Excellent Barrier resistance
• Non Toxic Properties
• Odorless
• Easily formed into complex
shapes
• Wide choice of appearance,
colors and transparencies

3. maTerial ProPerTy for Thin wall
molding
• Improved flow ability : permits luxury with odd
geometry in shapes
• •Low density & packing weight permits affordable
cost to performance
• •Excellent toughness to withstand against content
• •Optimal combination of flow, impact resistance &
stiffness
• •Stack ability for ease of bulk transport.
• •Excellent stiffness for the freedom of attractive
shape & size
• •Superior clarity & crystalline for the product
visibility.

4. Thin-Wall injecTion
Molding
• What is “ Thin Wall Injection Molding’’ ?
–• Wall thickness often <0.6 mm
–• Parts with flow ratio >150
–• High Injection pressure
–• High Injection speed
–• Applications for containers in
packaging and storage as well as
disposable use.

5. FasT cycling Molding – Key
RequiReMenTs
• A mold which is capable to run fast
cycles for a long period
• A capable injection molding machine
• Consistency in Raw Material
• Production environment with essential
well define Auxiliaries
• Cooling water for molding machine
• Fast and precise machine movements
for prolonged period..
• Chilled water for mold
• Energy saving operation

6. Reasons FoR “Thin Wall injecTion
Molding”
• Less material per part means less
material cost per part
• Thinner wall thickness means
shorter cooling time and therefore
shorter cycle time resulting
towards,
• Higher Productivity
–High Profitability

7. Machine Selection
criteria
• Higher cavity pressures result in
higher necessary Clamp forces.
• High Injection Pressure with > 2200
bar.
• High acceleration with accumulator-
power > 350 mm/s.
• Faster Response of controller within 2
mili seconds to be synchronized by
Smart hydraulic for the shortest cycle
time.

8. Machine Setting for “Thin Wall Injection
Molding”
• Nearly no holding or packing necessary
• Often Injection against mechanical stop in
the injection unit with no cushion
• Start injection before clamp force is fully
built for better venting
• Short cooling time
• Optimized machine movements for short
cycle time
• Parallel machine movements

9. Selection of injection
Unit
• Important factors:
–•Screw torque
–•Melt temperature
–•Injection rate and pressure
–•Cycle time - cooling time
–•Plasticizing rate
–•Repeatability
–•Screw Geometry

10. Mould Selection criteria for
“thin Wall injection Molding”
• Short runner channels to reduce flow
length and pressure losses
• • Hot runner is preferred compared to
cold runner systems
• • Gate bigger in size because of higher
volume flow through cross section
• • Special arrangement for gating like
cascade or sequential injection; per part
multi-gating

11. liMitationS of “thin-Wall
injection Molding”
• To high material stress
• • Flow properties of material
• • Residence time for material
because of smaller shot weights
• • Economical situation, related to
investment costs compared
advantages

12. •thank you
TWIM