How laminates with EVAL™ EVOH filmimprove the performance of VIPs

Cynthia TeniersEVAL Europe nv (Belgium)

17th & 18th September 2009

The Royal Institution of Great Britain, London

� Established in 1926

� 70 companies – 7000 employees

� Leader in high gas barrier technology and development

� World’s leading producer of EVOH (ethylene vinyl-alcohol copolymer resins)

Our products

EVAL™ EVOH resins EVAL™ EVOH films

Monolayer

EVOH films

Vacuum metallized

EVOH films

VIP value chain

Polymer films

Polymer-basedmetallized films

Metal foil(aluminium)

Insulatingmaterial

VIP barrier film(VIP laminate)

VIPAdhesives

EV

AL

™E

VO

H

film

s

How laminates with EVAL™ EVOH filmimprove the performance of VIPs

Cynthia TeniersEVAL Europe nv (Belgium)

17th & 18th September 2009

The Royal Institution of Great Britain, London

Recent VIP successes in Japan

� “Eco Cute” from PanasonicCO2 heat pump for hot water heater

� VIP around metal hot water tank (volume: 460 l or 370 l)

� Technical requirements

� Temperature (60°C/100°C)

� Moist conditons

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Recent VIP successes in Japan

� Floor heating

� VIP underneath floor heatingelements

� Technical requirements

� Temperature (40°C)

� Long service life (20 years)

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Recent VIP successes in Japan

� Wall heating

� VIP underneath wall heatingelements in a bathroom/toilet

� Technical requirements

� Temperature (40°C)

� Moist conditons

� Long service life (20 years)

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Recent VIP successes in Japan

� Insulation boards for walls

� VIP integrated in a PUR-boardto avoid damage duringinstallation

� Technical requirements

� Moist conditions

� Long service life (50 years)

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VIP market needs / trends

High temperature

Moist conditions

Longer service life

Market volumes

Technical challenges VIP laminates

Resistance to manipulation

Minimal thermal conductivity

Minimal gas permeationthrough the skin

O2

Minimal gas permeationthrough the seals

O2

How to achieve minimal thermal conductivity?

� λtotal = λsolid + λgas + λradiation + λconvection

• Reduced atmosphericpressure inside the VIP

• Almost zero

• Negligible below 100°C

• Use envelopes/films with a high gas barrier� Use aluminium foil

(very low λgas but high λsolid)� Use gas barrier film - EVAL™ EVOH film

(low λgas and low λsolid)

• Reduce the thickness of the aluminium layer� Use metallized films - EVAL™ VM-XL

(low λsolid and very low λgas)

� Use an Al/EVAL™ VM-XL envelope instead of an Al/Al envelope and you will increase the insulation performance of the VIP

0

0.001

0.002

0.003

0.004

0.005

0.006

0.007

0.008

0.009

1 2 3 4 5

VIP surface

Av

era

ge

th

erm

al c

on

du

cti

vit

y (

W/m

K)

Al/Al

Al/EVAL™ VM-XL

EVAL™ VM-XL/EVAL™ VM-XL

Core material VIP

½ thermal conductivity

Minimal thermal conductivity

Technical challenges VIP laminates

Minimal thermal conductivity

Resistance to manipulation

Minimal gas permeationthrough the skin

O2

Minimal gas permeationthrough the seals

O2

Gelbo flex test

Resistance to manipulation

� Use EVAL™ EVOH films to ensure that the barrier of the VIP is not damaged during production, transport and installation

Oxygen transmission rate (20°C,65% RH) after Gelbo flex test

0

2

4

6

8

10

12

0 20 40 60 80 100

Number of flex times

OT

R (

cc/m

².d

ay.a

tm)

EVAL™ EF-XL 12 µm

EVAL™ VM-XL 12 µm

VM-PET 12 µm

Al2O3-PET 12 µm

SiOx-PET 12 µm

PVDC coated PET 22 µm

Oxygen transmission rate (20°C,65% RH) after Gelbo flex test

0

2

4

6

8

10

12

0 20 40 60 80 100

Number of flex times

OT

R (

cc/m

².d

ay.a

tm)

EVAL™ EF-XL 12 µm

EVAL™ VM-XL 12 µm

VM-PET 12 µm

Al2O3-PET 12 µm

SiOx-PET 12 µm

PVDC coated PET 22 µm

Resistance to manipulation

Technical challenges VIP laminates

Minimal thermal conductivity

Minimal gas permeationthrough the skin

O2

Minimal gas permeationthrough the seals

O2

Resistance to manipulation

0.1

0.5

40°C, 90% RH

EVAL™ TM-XL EVAL™ VM-XL

0.01

0.05

40°C, 65% RH

OT

R (

cc

/m².

da

y.a

tm)

WV

TR

(g

/m².

da

y)

� EVAL™ TM-XL

New generation of vacuummetallized EVOH film

For applications with higheroperating temperatures, moistconditions and a longer service life

A robust film with excellent oxygen barrier and improvedwater vapour barrier

Minimal gas permeation through the skin

0.05

0.01

40°C, 65% RH

Technical challenges VIP laminates

Minimal thermal conductivity

Resistance to manipulation

Minimal gas permeationthrough the skin

O2

Minimal gas permeationthrough the seals

O2

Minimal gas permeation through seals

� Use EVAL™ EVOH films to reduce the total permeation of oxygen via the seals and extend the life time of the VIPs

Films

20°C, 65% RH 20°C, 85% RH

EVAL™ EF-XL 0.38 0.75

EVAL™ EF-F 0.40 1.6

EVAL™ EF-E 1.6 3.4

cPP 3250 3250

LDPE 10000 10000

Oxygen transmission rates of selected polymers

(cc.20 µm/m².d.atm)

x 6250

x 2030

x 2940

x 950

� Typical sealing temperatures for EVAL™ EVOH films

Minimal gas permeation through seals

0

0.5

1

1.5

2

2.5

3

150 155 160 165 170

Sealing temperature (°C)

Se

al

Str

en

gth

(k

g/1

5 m

m)

EVAL™ EF-E 30 micron EVAL™ EF-E 25 micron

Seal conditions: force = 1kg/cm2, dwell time = 0.5 seconds

Laminate structure: OPA//EVAL™ EF-E

Conclusion

� EVAL™ EVOH films can be introduced as anintermediate layer and/or sealing layer

EVAL™ EVOHfilm

Intermediate layer Sealing layer

EVAL™ EVOHfilm

Conclusion

Minimal thermal conductivity

Resistance to manipulation

Minimal gas permeation

through the skin

O2

Minimal gas permeationthrough the seals

O2

� Use EVAL™ EVOH films to increase the insulation performance, service life and operating temperature of VIPs