Study of heat sealing of polymer multilayers Study of heat

Study of heat sealing of polymer multilayers
F.Dubelley11, E.Planès11, C.Bas11, B.Yrieix22, E.Pons22, L.Flandin11
1
1LEPMI
LEPMI
UMR
UMR CNRS
CNRS 5279
5279 // LMOPS
LMOPS –
– Grenoble
Grenoble INP
INP -- Université
Université J.Fourier
J.Fourier –
– Université
Université de
de Savoie
Savoie
Campus Scientifique
Campus
Scientifique Technolac
Technolac –
– Bat.
Bat. IUT
IUT –
– F73376
F73376 Le
Le Bourget
Bourget du
du Lac
Lac Cedex,
Cedex, France
France
2
2EDF
R&D, MMC:
MMC: Matériaux
EDF R&D,
Matériaux et
et Mécaniques
Mécaniques des
des Composants
Composants
Avenue
des Renardières
Avenue des
Renardières –
– Ecuelles,
Ecuelles, F-77818
F-77818 Moret-sur-Loing
Moret-sur-Loing Cedex,
Cedex, France
France
INTRODUCTION
METHOD
MATERIALS
Investigation of the heat sealing properties of :
•two multilayers structure
•two sealant material
For building application → Use of polymer-metal multilayer[2]
Adhesive 3µ m
Alu 80nm
Weak area for
mechanical and
barrier properties
PET 12µm
PP 50µm
Complex 1-1
Complex 3-1
Complex 3-2
Goal → Optimization of the seal
Mechanical strength, barrier properties, …
LDPE 70µm
LDPE
PP
Melting temperature
108°C
159°C
Sealing temperature
110°C to 180°C
170°C to 220°C
Dwell time
1 to 90s
1 to 30s
Based on polymer layers
coated with aluminium
Definition of mechanical parameters:
F
Normalized Seal Strength: SS = W × e
→ Relation between seal morphology and
max
failure mechanism
RESULTS
Optimization of heat sealing parameters of sealant materials
At T > 120°°C
Mechanical Behavior more stable
Increase in stiffness and SS
At 110°°C and 115°°C
Larges instabilities in the
mechanical behavior
The temperature alters more the properties than the dwell time[3,4]
Same results obtained for the other dwell time tested and for the PP sealant materials
Relation mechanical parameters – Failure modes :
•(A) mode: Low SS
•(B) & (C) modes: SS = SSm
→ Solely different in failure mechanism
Case of multilayers
For the multilayers
High
mechanical
strength
A: Peeling
failure
B1: Tearing
failure
B2: Breaking of
the PE/PP layer
at the edge of
the seal
B3: Breaking of the
PE/PP layer at the
edge of the seal
+
Delamination
between PE/PP and
PET layers
C: Peeling and
tearing +
Delamination
between PE/PP
and PET layers
For multilayers : Relation mechanical parameters – Failure modes
With an increasing number of PET layers :
• Evidence of new failures modes
• Larger reduction in optimal time – temperature range
OVERVIEW
ACKNOWLEGEMENT
• BARISOL Prebat Project financed by ANR and Overviewed by ADEME
• EMMA-PIV Projet financed by ANR.
• Special Thanks to all industrial partners of this project: CSTB (C.Pompeo,
G.Garnier), REXOR (P.Rousset, V.Robin)
--- C mode failure for the sealant layer
With an increasing number of PET layers:
•Complexity of failures modes
•Reduction of optimal time – temperature range
•Mechanical strength SSm increases with the number of PET layers
References
[1] E.Planes, S.Marouani, and L.Flandin. Optimizing the heat sealing parameters of
multilayers polymeric films. Journal of Materials Science, 46:5948-5958, 2011
[2] K.Araki, D.Kamoto, and S.I.Matsuoka. Optimization about multilayer laminated
film and getter device materials of vacuum insulation panel for using at high
temperature. Journal of Materials Processing Technology, 209(1):271-282, 2009
[3] P.Meka and F.C.Stehling. Heat sealing of semicrystalline polymer films. 1.
calculation and measurement of interfacial temperatures: Effect of process variables
on seal properties. Journal of Applied Polymer Science, 51(1):89-103, 1994
[4] F.C.Stehling and P.Meka. Heat sealing of semicrystalline polymer films. 2. Effect
of melting distribution on heat-sealing behavior of polyolefins. Journal of Applied
Polymer Science, 51(1):105-119, 1994