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providing packaging solutions through engaged hearts and mindsTM
The Challenges of Designing & Developing Plastic Aerosols for a Global Market
Richard C. Darr VP Global Packaging Development October 2018
Our Company
• Family owned and managed
• Founded in 1967
• 2017 revenue : $2.7 billion
• Over 40 billion units produced annually
• 6,600 associates worldwide
• Over 40 production sites globally
• 5 + billion bottles recycled annually
• Over 1,500 patents globally
A Global Business
• 58% of Global Business
• Founded in 1967
North America
• 4% of Global Business
• Entered Market in 1997
South America
• 37% of Global Business
• Entered Market in 2005
Europe & Africa
• 1% of Global Business
• Entered Market in 2015
Asia
Global Revenue 2017 - $2.7 billion
Why use a PET aerosol container?
Shelf impact
Low carbon
footprint
Lightweight
Different!
Innovative
Versatile / shape
flexibility
PET Aerosol Containers
Technical challenge Regulatory limitations
Legislative
Constraints
Plastic Aerosol Regulation Accuracy or Ambiguity?
• Plastic aerosol containers are in the market today
• Current legislation worldwide allows plastic containers up to 500ml brimful volume (except Europe and parts of Asia)
• Plastic containers up to 1000ml brimful volume became standard in North America, based on British standard
• European Commission asked for harmonisation with global regulations in 2005
• FEA supports plastic cans up to 800ml and increased pressure up to 13.2 bar (with compressed gasses)
Regional Legislative Overview
• U.S. DOT (Department of Transportation) Outlines the various testing procedures
• NFPA (National Fire Protection Association) 30B:
– Fire & explosion prevention
– Applies to all areas of manufacturing & storage facilities
• No stated legislative requirements within most LATAM countries for Plastic Aerosols
• Requirement to place a safe aerosol on the market
• Major brand owners follow DOT or ADD regulations
• Regulated by the Aerosols & Dispensing Devices Directive (ADD 75/324/EEC and revision in 2008)
• Plastic aerosols treated like glass aerosols
• Size limitations
– ≥50ml, ≤220ml
• Pressure limitations
PET Aerosols:
Design &
Development
Challenges
• PET
• Mechanical performance
• Barrier performance
• Thermal characteristics
PET Material
PET: Polyethylene Terephthalate
A thermoplastic polymer resin of the polyester family
PET
Packaging material barrier properties
Oxygen p
erm
eabilit
y (
cc/m
².day.b
ar)
Water permeability (gr/m².day)
0.01 0.01 0.1 1 10 100 1000 10000
0.1
1
10
100
1000
10000 LDPE
PP
PET
PEN
HDPE
MxD6
COC
LCP
EVOH
PS PC
PA6
Cellulose
Starch
Film thickness : 100 µm
PET has an excellent gas barrier
Tg. Glass transition temperature
PET = 70-75°C The glass transition temperature is the temperature below which
the physical properties of amorphous materials vary in a manner
similar to those of a solid phase (glassy state), and above which
amorphous materials behave like liquids (rubbery state).
Tc. Crystallization temperature
PET = 140-160°C The temperature at which a crystalline resin begins to crystallize
upon cooling.
Tm. Melting temperature
PET = 245-255°C The temperature at which a material turns suddenly from solid to
liquid.
Sidel Source
Thermal Characteristics
• A machine that injects a preform and blows a container within the one machine
• Suitable for small volumes
ISBM Single stage or One-Step Technology
Injection Stretch Blow Moulding (ISBM)
ISBM 2 step technology
1. Preform injection
2. Container blowing
Manufacturing SprayPET® Plastic Aerosols
PET Resin Drying
PET Resin Extrusion
PET Resin Injection
Preform Cooling
The injection process
Preform Injection
Why the need for drying?
1. Degradation of PET due to water (hydrolysis – IV drop)
2. Hazy preform due to crystallization
3. 40% of energy to heat the pellets is supplied through the dryer
Residence time
4 – 6 hours
Less 40ppm
160-175oC
Dew point: max -30oC
Dryer
Resin drying is essential for high quality preform moulding
Preform Injection
Preform Injection
Opening and
Part Removal
Mould
Close Shutter-
In/Clamp-Up
Inject Hold Cool
Dry Cycle
Process Cycle
Cycle Compression (Cycle Time Saving)
SHOOTING POT
The blowing process
We all have done it!
Container Blowing
Container Blowing
Preform Heating
Preform Stretching
Preform Blowing
Bottle Cooling
The blowing process
Start Stretching
End Stretching
8 bar
40 bar
Bottle Temp < 75°c
Stretching Stretching & Pre-Blow
End Stretching & Pre-Blow
Blowing Exhaust
Container Blowing Process
The Key Technical Challenges
Ability to withstand
high pressures
Material resistance to
extreme temperatures
Ability to withstand
impact from dropping
Technical Challenge in Context
In Europe Plastipak aerosol containers are rigorously tested to draft FEA standard 647 part 1
Pressurised to c. 2 -3 bar Pressurised to c. 10 bar
Ability to withstand high pressure
• Dependent on desired burst pressure, specific hydraulic pressure applied and held for 25 seconds
• Pressure then increased until container bursts
• To pass, burst point must be 20% higher than hydraulic pressure
• Must pass burst test without splintering
SprayPET® Achieves Burst Pressure up to 27bar/390psi
Resistance to Heat
• FEA proposed testing
• Under test, filled & pressurised aerosols must not burst or leak
– Water bath: 55oC for 10 minutes
– Hot air testing: placed in an oven at 65oC for minimum 5 hours. Deformation is allowed
Resistance to Heat
Drop Resistance
• Containers filled with antifreeze or water
• Held at -18oC for 24 hours and 55oC for 6 hours
• Then dropped from height of 1.8m on to concrete floor
• Containers must not burst or leak
Drop Resistance
Summary of Plastipak’s extensive testing
Test Result
Hydraulic test Pass @15.0 bar
Burst test Max 27.0 bar/390psi
Drop test (all temperatures)
Pass
Hot air 65°C Pass (5h)
Top load Min 100.0 kgF
Stress cracking Pass with NaOH
Applies to SprayPET
220ml container
Other
Perceived
Challenges
Compatibility with propellants
• Compressed gasses
• Non-flammable combinations of liquid propellants
• Hydrocarbons
– PET has a good chemical resistance to butane and propane
• DME not compatible
Content Compatibility
• PET aerosols compatible with many products – but not everything
• Compatibility testing required for each project
• Reformulation an option with challenging contents
Decoration
Sleeving
• Containers can be sleeved without issue
• Sleeve manufacturer tested sleeved containers in 55oC water bath for 10 minute, 1 hour, 2 hour & 3 hour periods:
– No detrimental impact observed
Printing
• Printing is fully possible on PET containers
• Printing on different shapes is possible – not just straight sided cylinders
• Plastipak offers 4 colour, high-speed silk screen printing
• Used effectively for premium brands
Direct Object Printing
• Successfully launched in the USA and currently in development in Europe
• Real “no label” look
• Mass customisation
• Reduced waste
• Enhanced customer engagement
• Faster speed to market with inline variable data print
• Instant change over
Some Initial Different Designs
• Easy to implement
• Change of blow moulds required
– Preform changes may be required subject to design
– Cost dependent on volumes / blowing machine
• How much value do you put on shelf presence / differentiation?
Complexity of Customised Shape?
Case study
• Launched in US January 2017
• PET container supported by HDPE base cup
• Sleeve decoration
Plastic Valves
Summary
Different legislation
regionally – largely
supportive
Comprehensive
testing regime in
place
Decoration not an
issue
Propellant & product
compatibility OK