blow moulding process & barrier containers part 3 multilayer coextruded containers

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Assocomaplast - Centro Direzionale Milanofiori - Palazzo F/3 - 20090 Assago - Milan - Italy - tel +39 02 8228371 - fax +39 02 57512490 - e-mail: [email protected] www.assocomaplast.org

Blow Moulding Process

& Barrier Containers

Part 3 Multilayer coextruded containers

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- 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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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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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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Barrier performance

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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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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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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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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


Structures

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Packaging for

• Agro-chemical • Garden• Foodstuffs• Cosmetics• Pharmaceuticals


Applications of multilayer coex containers

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Bottle design - Use of Computer Aided Design

blow moulding process & barrier containers part 3 multilayer coextruded containers

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