blow moulding process & barrier containers part 3 multilayer coextruded containers
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D.1
Assocomaplast - Centro Direzionale Milanofiori - Palazzo F/3 - 20090 Assago - Milan - Italy - tel +39 02 8228371 - fax +39 02 57512490 - e-mail: info@assocomaplast.org www.assocomaplast.org
Blow Moulding Process
& Barrier Containers
Part 3 Multilayer coextruded containers
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D.2
Assocomaplast - Centro Direzionale Milanofiori - Palazzo F/3 - 20090 Assago - Milan - Italy - tel +39 02 8228371 - fax +39 02 57512490 - e-mail: info@assocomaplast.org www.assocomaplast.org
- Strength and rigidity- Aluminum seal weldable- Printable and labeling- Use of R-material (middle layer)- Esthetic (gloss)- Chemical resistance- Barrier layer
food/beverages: oxygen, lightcosmetics: active chemicals, oxygen agro: active chemicals, oxygen
Advantage of multimayer bottles
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D.3
Assocomaplast - Centro Direzionale Milanofiori - Palazzo F/3 - 20090 Assago - Milan - Italy - tel +39 02 8228371 - fax +39 02 57512490 - e-mail: info@assocomaplast.org www.assocomaplast.org
BOTTLE WALL
Water
Oxygen
Smell
Water
Fragrancies
Bad smell
Barrier layer function: reduce migration of gases through the bottle wall
Function
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D.4
Assocomaplast - Centro Direzionale Milanofiori - Palazzo F/3 - 20090 Assago - Milan - Italy - tel +39 02 8228371 - fax +39 02 57512490 - e-mail: info@assocomaplast.org www.assocomaplast.org
Material Oxygen
cm³ mm/m² 24h bar
CO2
cm³ mm/m² 24h bar
Water vapor
g mm/m² 24h bar
EVOH
PVdC
PA
PET
u-PVC
PE-HD
PP
0.04
0.04
2.3
4.4
4.4
44
90
0.12
0.12
4.7
6
12
120
180
0.08
0.08
2.4
1.6
1.2
0.2
0.2
K- Coefficient of permeability for commercial plastics
Coefficient of permeability
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D.5
Assocomaplast - Centro Direzionale Milanofiori - Palazzo F/3 - 20090 Assago - Milan - Italy - tel +39 02 8228371 - fax +39 02 57512490 - e-mail: info@assocomaplast.org www.assocomaplast.org
Barrier performance
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D.6
Assocomaplast - Centro Direzionale Milanofiori - Palazzo F/3 - 20090 Assago - Milan - Italy - tel +39 02 8228371 - fax +39 02 57512490 - e-mail: info@assocomaplast.org www.assocomaplast.org
Polymer and structure selection for barrier containers (1)
Data related to:
• Polymer compatibility/adhesion to other polymers
• Barrier coefficients
• Aroma migration data
• Water absorption
• Chemical and swell resistance to organic solvents, oils and fats
• Chemical resistance to agrochemical active components
• ESCR at different °T are provided normally by polymer, barrier resin and adhesive manufacturers.
Selection
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D.7
Assocomaplast - Centro Direzionale Milanofiori - Palazzo F/3 - 20090 Assago - Milan - Italy - tel +39 02 8228371 - fax +39 02 57512490 - e-mail: info@assocomaplast.org www.assocomaplast.org
Polymer and structure selection for barrier containers (2)
Brand owners in the food, agro, pharma and cosmetics activity have to issue own customer specifications, which has to identify the container design, weight and structure in terms of polymer selection, including the barrier resin.
The blowmolder has to agree with the brand owner about feasibility, cost, timing and container performance.
Selection
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D.8
Assocomaplast - Centro Direzionale Milanofiori - Palazzo F/3 - 20090 Assago - Milan - Italy - tel +39 02 8228371 - fax +39 02 57512490 - e-mail: info@assocomaplast.org www.assocomaplast.org
2 layersPE-LD/PE-HD
3 layersPET/PET/PETPET/PA/PETPE-HD/R PE-HD /PE-HDPE-HD/Adhesive/PAPE-HD/Adhesive/EVOH
4 layersPE-HD/R PE-HD/Adhesive/PA or EVOH
Courtesy BEKUM International
Structures
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D.9
Assocomaplast - Centro Direzionale Milanofiori - Palazzo F/3 - 20090 Assago - Milan - Italy - tel +39 02 8228371 - fax +39 02 57512490 - e-mail: info@assocomaplast.org www.assocomaplast.org
5 layers
PE-HD/adhesive/EVOH/adhesive/PE-HDPE-HD can be replaced in some cases by PPEVOH can in some cases be replaced by PA
6 layers
PE-HD/R PE-HD/adhesive/EVOH/adhesive/PE-HDPE-HD can be replaced in some cases by PPEVOH can in some cases be replaced by PA
Courtesy BEKUM International
Structures
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D.10
Assocomaplast - Centro Direzionale Milanofiori - Palazzo F/3 - 20090 Assago - Milan - Italy - tel +39 02 8228371 - fax +39 02 57512490 - e-mail: info@assocomaplast.org www.assocomaplast.org
Packaging for
• Agro-chemical • Garden• Foodstuffs• Cosmetics• Pharmaceuticals
Courtesy BEKUM International
Applications of multilayer coex containers
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D.11
Assocomaplast - Centro Direzionale Milanofiori - Palazzo F/3 - 20090 Assago - Milan - Italy - tel +39 02 8228371 - fax +39 02 57512490 - e-mail: info@assocomaplast.org www.assocomaplast.org
Bottle design - Use of Computer Aided Design
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