Water Vapor Transmission of Laminate Film for CS Packages Uno M. Nagoya Univ.

Water Vapor Transmission of Laminate Film for CS Packages

Uno M. Nagoya Univ.

CS need keeping wet for refresh.But laminate film may not be enough.

CS package film:PET 15μm/Al 7μm/PE 60μm

Al is originally perfect against water vapor.

But Al foil has pinhole (~ 10/m2).

And the face of seal part isn’t covered with Al.

So we have to check.

Set UpSize; 12.5×10cm2 (opera

emulsion)

Contents; sample cotton wool+water (2g) reference cotton

20 packages for each type

Storage environment; 40˚C(Yamato Program Incubator IN61)

—watching the change of weight of these packages.

Weigh these packages Electronic Balance

(AND FA-200)

max = 210g

min scale = 0.001g

—weighing Al cluster every time to check the state of the balance.

—These changes are so small that I weigh 20 packages at the same time.

0

50

100

150

200

250

300

178.74 178.75 178.76 178.77

weight (g)

DATAfitting

σ 0.0014g

Weight of Packages

138.3

138.31

138.32

138.33

138.34

138.35

138.36

138.37

138.38

10/ 11 10/ 31 11/ 20 12/ 10 12/ 30 1/ 19 2/ 8

date

sample(g)

97.97

97.98

97.99

98

98.01

98.02

98.03

98.04

98.05reference(g)

samplereference

10mg

Weight of Packages and Humidity

- 0.04

- 0.03

- 0.02

- 0.01

0

0.01

0.02

0.03

10/ 21 10/ 31 11/ 10 11/ 20 11/ 30 12/ 10

chan

ge o

f w

eigh

t (g

)

0

10

20

30

40

50

60

70

hum

idity

(%)

referencesamplehumidity

Weight of Packages and HumidityWeight of packages depend on humidity.In fact, PET is generally absorbent (0.1-

2.5%).

0

0.05

0.1

0.15

0.2

0.25

0 500 1000 1500 2000

time (m)

the

wei

ght

incr

ease

d (g

)

samplereference

97.98

98

98.02

98.04

98.06

20 40 60Humidity (%)

Refe

renc

e (g

)

138.3

138.32

138.34

138.36

138.38

Sam

ple (

g)

referencesample

20%45%

Value of “sample – reference”

Laminate film is good for CS packages !

0.00008g/ day/ 20packs

40.23

40.24

40.25

40.26

40.27

40.28

40.29

40.3

40.31

40.32

40.33

40.34

40.35

10/ 23 11/ 12 12/ 2 12/ 22 1/ 11date

diff

ere

nce o

f w

eig

ht

(g)

Requirement;

<0.1g/5years/1pack

<0.0011g/day/20packs