specification of metallized films and substrates · specification of metallized films and...
TRANSCRIPT
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Specification of Metallized Films and Substrates
AIMCAL Fall Technical Meeting
2005
Eldridge M Mount IIIEMMOUNT Technologies
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Specifying Metallized Films & Substrates
• End use dependent
– Decorative application
– Functional application• Developed properties
• Base sheet properties
– End use dependent• Property development
• Mechanical properties
• Thermal properties
• Metallizer dependent
– Web handling properties• Surface properties
• Mechanical properties
– Thermal properties
– Drive characteristics
• Minimum tension
– Boat design• Distance to web
• Boat spacing
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Substrate in Metallization
A material with specific properties which is designed as a foundation to support and carry an additional layer of vacuum deposited metal.
It supplies the basic strength, stability and compatibility properties needed by the product and the added metal (aluminum) layer
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Design and Specification
• The product design and specifications must come from a process designed to determine the fitness for use of the product and the substitute quality characteristics used to measure the the films performance in use
• Fitness for use gives the product design
• Substitute quality characteristics gives the film specification
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Fitness-For-Use
• based upon the performance needs and request of the costumer.
• This information has to be obtained by a series of conversations or interviews with the customer about the expectations of performance for the product he will be packaging or converting. The purpose of the conversation is to obtain this information, in the costumer’s language.
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Fitness-For-Use Categories
• product designer should be searching for three categories of information;– performance characteristics which are required to be met to
insure that the new product works (it is FFU),
– performance levels or attributes which if met will delight the customer by exceeding his expectations.
• These performance levels need not be required by the product for generating functional product or may simply represent a better performance level than required for FFU.
– performance characteristics found in competitive products, which must be matched or about which the customer must be educated.
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What are Substitute Quality Characteristics?
Film property values and performance measures derived from the FFU statements and performance measures by direct experimentation.
Values represent the quality control targets for film manufacture, which are to be used to control the consistency and quality of the film being manufactured.
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Where do I Find Substitute Quality Characteristics?
film properties should be developed from experiments, which demonstrate the fitness for use characteristic specific to the end use.
Film properties which do not impact on the performance of the film in the end use need not be measured or controlled but may be part of the film profile or typical values.
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Metallized Film & Substrate Properties
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Principal Substrate Properties
• Cost
• Metallizing Surface Energy
• Tensile strength
• Stiffness
• Stability
– Thermal
– Environmental
• Gas Transmission
• Winding Properties
• Sealability
• Durability
• Tear strength
• Impact strength
• Lubricity
• Abrasion Resistance
• Dielectric properties
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Metallizing Substrates: Key Substrate Properties
• Paper
• Polyester
• Polypropylene
• Polyethylene
• Polyimides
• Polyamides
• Others
• Stability – thermal & environmental
• MD Modulus
• Yield Strength
• Yield Point
• Film Thickness / Web width
• Shrinkage; % and Temperature
• Coefficient of Friction
• Metallization Surface– Surface energy
– Surface gloss
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Metallized Film CharacteristicsPackaging Films• Supplies Light Barrier • Moisture Barrier Essentially
the Same– Aluminium Supplies the
Barrier
• Oxygen Barrier Dependent on Surface– Interface Controls the Barrier
• Chemical Barrier Extremely Variable– Permeant / Base Polymer
Interaction– Metallizing Layer can Control
Electronic or capacitor Film
• Surface resistance• Dielectric strength• Oil resistance• Surface defects
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Metallizer Quality Measures
• “Appearance”
• Optical density level & variability
• Metal adhesion
• Gas & Moisture Barrier
• Surface resistivity
• Roll conformation
• Metal pickoff
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Appearance
• Bright “Shinny” Surface– Controlled by law angle
gloss
– Gloss controlled by surface smoothness
• Brushed appearance– Uniform surface
scratching
• Matte Surface– Controlled surface
roughness
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Surface Treatment Level:must determine experimentally
• Low level for metal uniformity
• Select type of treatment
– Impacts surface chemistry
• Will impact:– Optical Density
– Metal adhesion
– Barrier Levels
• Over treatment possible– Lowers metal adhesion
• Online + Plasma
• No back side treatment Untreated surface with static discharge
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Light Barrier (OD) Specification
LIGHT TRANSMISSION VS. OPTICAL DENSITYT%= Antilog(2-OD)
0
1
2
3
4
5
6
7
8
9
10
1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3
OPTICAL DENSITY (OD)
LIG
HT
TR
AN
SM
ISS
ION
(T
%)
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Surface Resistivity Specification
Surface Resistance to Optical Density for Aluminum
Metallized 48 Gauge Polyester Film
SR = 0.8626*OD2 - 6.1352*OD + 11.543
R2 = 0.8623
0
1
2
3
4
5
6
7
8
0 0.5 1 1.5 2 2.5 3 3.5 4
Optical Density
Su
rface R
esis
tan
ce
(oh
ms
/ s
q)
Surface Resistance
(ohms / sq)
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Barrier Example• Determine required permeability
– 20 ppm oxygen ruins product
– Package area 100 in2
– 1 pound (454 gms) of product in package
• Calculate– 20 ppm = 0.00908 gm of oxygen
– O2 mol wt = 32gm/mol è 0.000284 moles
– 1 mole = 22414 cc at STP è 6.36 cc total to ruin product
• Permeability required
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Required Permeabilityfor 6.36 cc oxygen gain
Permeability:
cc/100 in2/day
Permeability:
cc/100 in2/dayShelf life
0.174
0.50
0.707
2.12
200 ppm
0.01741 year
0.053120 days
0.070790 days
0.21230 days
20 ppmOxygen gain to
failure
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Composite Barrier CalculationsLamination of n Layers
1/ Plam = (X1/ P1)+(X2/ P2)+…+ (Xn/ Pn)
L
X1
W. J. Schrenk and T. Alfrey Jr., “Some Physical Properties of Multilayered Films”, Polymer Eng. & Sci., Vol 9(4), pp 393-399
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Printed OPP/Metallized/EVATO2 WVTR
cc/100in2/day gm/100in2/day• OPP 163 .45• Metallized 0.05 .05• Nylon/EVOH/Nylon 0.1 11• EVA 200 0.6
2
2
1 1 1 1 = 0.0061+20+.00520.0111
1 6 3 0 . 0 5 2 0 0
0 . 0 4 9 9 0 . 0 5
1 1 1 1 = 2.22+20+1.67=23.89
. 4 5 . 0 5 . 6
0 . 0 4 2
T O
T O
W V T R
W V T R
P
P
P
P
= + + =
= »
= + +
=
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Barrier MappingMount III, Eldridge, M., Wagner, John R., “Aroma, Oxygen and Moisture Barrier Behaviour of Coated and Vacuum Coated OPP Films for Packaging”,
TAPPI Press, Technical Proceedings of 1998 Polymers, Laminations & Coatings Conference, San Francisco, 1998, p 875
WVTR vs. OTR for various Barrier Films
0.01
0.1
1
10
100
0.001 0.01 0.1 1 10 100 1000
OTR (cc/M2/day)
WV
TR
(g
/M2/d
ay)
Al Foil
MET-UHB
MET-HB
70MET / 60MAC
MET PET
Al/amPA/OPP
Al/APET/OPP
SiO2/PET
SiO2/OPP
SiO2/OPP
Al Foil
MET-UHB MET-HB70 MET
60 MAC
SiO2/PET
MET PET
Al/amPA/OPP
Al/APET/OPP
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Metal Adhesion Specification
At Metallization
• No pin windows on unwinding
• No pick off 610 tape
• Threshold strength on heat sealing adhesion test (gm/in – kg/cm)
– Tie to lamination performance by testing
At end user
• No metal transfer on delamination
• Specific peel strength value
– Related to lamination method
– Related to lamination performance???
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Web Handling System
• Rewinder in vacuum
• Driven and idler rolls– Individual rolls driven;
Digital drive
– Chain or belt driven
• Three tension zones– Unwind break
– Chill roll
– Rewind with various control methods
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Key Substrate Properties:Winding and web transport
• MD Modulus
• Yield Strength
• Yield Point
• Film Thickness / Web width
• Shrinkage; % and Temperature
• Coefficient of Friction
• Metallization Surface
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Poisson’s Ratio: source of MD wrinkles and “Railroad Tracks”
W0
W1L0
L1
1 0
0
1 0
0
1 0
0
2 1
, axial strain
, laterial strain
, compressive strain
Poisson's Ratio =
0.3 for most polymers
x
y
z
y
x
L L
L
W W
W
t t
t
e
e
e
en
e
n
-=
-=
-=
-
»
tension
t0
t1
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Lateral Compressive Wrinkles• As web heat up or as tension
is reduced the web grows in width
• As web spreads it is resisted by friction between roll surface.
• If the frictional force exceeds the buckling force the web will wrinkle (pushes in on web edges)
• Wrinkles are in the MD and generally evenly spaced
COF also impacts
Railroad track (Tram line)
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MD TensionStress
Strain
Break point orUltimate strength
Yield point
Elastic limit10%
10%
25%
25%
Tension Control
Draw Control
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Film Tensile Property Comparison
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Film Strength Comparison
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Maximum Web Tension• Determine PLI (pounds per inch) for 10% of Elastic
limit of a 60 inch wide 1 mil product
• Paper 3% @ 22900 psi = 137.4 lbs = 2.3 pli
• PET 5% @ 32000 psi = 192.0 lbs = 3.2 pli
• OPP 33% @ 18000 psi = 108.0 lbs = 1.8 pli
• Cross sectional Area = 60 in * 0.001 in = 0.06 in2
• Load/cross-sectional area = 0.1* Yield Stress
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Winding Tension Level
• Tension level should keep MD elongation below 1% elongation
• Must have good tensile data at low elongation
• Calculate just like web handling example but at 1% elongation as opposed to 10% elongation
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Conclusions
• Film specifications multifaceted
– End use dependent
– Equipment dependent
• Must know the FFU
• Generate Substitute Quality Characteristics
• Characterize film property performance for each Metallizing Chamber
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Appendix
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Source of Metallized Film Barrier
• Aluminum is necessary but not sufficient
• The surface on Which the Metal is deposited controls the oxygen and moisture barrier
• The substrate controls the balance between:
– Moisture
– Oxygen
– Aroma
• Surface Free energy of the surface impacts metal “quality”
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Typical PET Product Designs
Aluminum layer
Homopolymer PET
Sealable polymer layer
Aluminum layer
Homopolymer PET
Sealable Film
Plane film
Aluminum layerPEN polymer surface
Homopolymer PET Core
High Barrier PET
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Typical OPP Product Design
Aluminum layerTreated EP-copolymer surface
Homopolymer PP Core
Sealable polymer layer
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Aluminum layerTreated, Non OPP polymer surface
Homopolymer PP Core
Sealable Polymer Layer
High Barrier Metallized OPPProduct Design Concept
EVOH
HDPE
Amorphous NYLON
Amorphous PET
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Barrier Property Summary
1-21-2SiO2Special OPP
1-21-10SiO2PET
61.91.93AlEVOH/OPP
0.30.16AlOPP/EVOH
5.60.78AlOPP/APET
3.11.20AlOPP/AmPA
60.00.93AlOPP/Copolymer
310.01.50AlLDPE*
1.51.24AlBON*
54.21.24AlBOPP*
1.240.93AlPET*
Oxygen permeability***
CC/M2/24 hrWVTR **Gm/M2/24 hr
CoatingSUBSTRATE
*Kail , J. A. E, “The Role Of Plastic Substrates In High Barrier Metallization: Materials/Process Interactions”, Technical Service, ICI Americas, Hopewell, Va
**WVTR: ASTM test method F1249-90, 37.8 °C (100 °F) and 90% relative humidity (RH).
***Oxygen permeability: ASTM test method D 3985-81, 23 °C (73.4 °F) and 0% RH.
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Ultimate Strength
49
7869
60
2013
20
167 167
127
59
9.8
49
111 113 111
6052
19
34
275
167
226
78
9.8
111
0
50
100
150
200
250
300
Celloph
ane
Cellulose
Ace
tate
Nylon
-6
Polyc
arbo
nate
HDPE
LDPE
iono
mer
polyes
ter,
PET
polyim
ide
polypr
opylen
e
polystyren
e
nonr
igid P
VC
Sar
an (D
OW
trad
emar
k)
film type
Ult
am
ate
Str
en
gth
, M
Pa
Minimum
Maximum
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Film Properties
27.6557429.81328
34.8148532.75538
41.189442.56238 41.87589
28.4403 27.65574
43.44501
36.87432
30.49977
23.83101
0
5
10
15
20
25
30
35
40
45
50
Celloph
ane
Cellulose
Ace
tate
Nylon
-6
Polyc
arbo
nate
HDPE
LDPE
iono
mer
polyes
ter, PET
polyim
ide
polyprop
ylen
e
polystyren
e
nonrigid P
VC
Saran
(DOW
trad
emark)
Film Type
Yie
ld M
^2/K
gm
Series1
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film modulus
1.4
2.4
0.6
2.5
0.7
0.1 0.15
3.4
3.1
2.52.7
1 1.1
3.1 3.1
0.8
2.5
1
0.250.4
5.5
3.1
4.9
3.7
2
1.2
0
1
2
3
4
5
6
Celloph
ane
Cellulose
Ace
tate
Nylon
-6
Polyc
arbo
nate
HDPE
LDPE
iono
mer
polyes
ter,
PET
polyim
ide
polypr
opylen
e
polystyren
e
nonr
igid P
VC
Sar
an (D
OW
trad
emar
k)
Film Type
Mo
du
lus
, G
Pa
Minimum
Maximum
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Elongation
25 15
250
75
25
220
300
30
7050
10
6030
5070
400
105
300
600
400
120
70
250
20
200
60
0
100
200
300
400
500
600
700
Celloph
ane
Cellulose
Ace
tate
Nylon
-6
Polyc
arbo
nate
HDPE
LDPE
iono
mer
polyes
ter,
PET
polyim
ide
polypr
opylen
e
polystyren
e
nonr
igid P
VC
Sar
an (D
OW
trad
emar
k)
Film type
Elo
ng
ati
on
%
Minimum
Maximum
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EMMOUNT TechnologiesConsulting and Technical Services To the Polymer Extrusion and FConsulting and Technical Services To the Polymer Extrusion and Film Converting Industriesilm Converting Industries
ph 585.223.3996ph 585.223.3996fax 585.223.3480fax 585.223.3480
[email protected]@earthlink.netwww.emmountwww.emmount--technologies.comtechnologies.com
• QUALITY SERVICE
• Confidentiality• Complete confidentiality of client information with no
disclosure of confidential information • Ethical• All patentable concepts developed while working for
client, disclosed and assigned to client,• Efficiency• A knack for being able to “zero- in” on the problem at
hand and to systematically identify solutions,• Team Player/Excellent Communicator• Able to work well with line-operators, engineering staff
and management to cross-communicate technical information,
• LIFETIME EXPERIENCE/ TOP-NOTCH KNOWLEDGE
• Troubleshoot or focus your R & D having the advantage of a lifetime of learning and experience,
• Continuous Improvement• Goal is to exceed the client’s expectations and to provide
information about the most recent advancements in the field,
• References• Professional references gladly provided.
•• ·· Polymer Processing and Polymer Processing and •• TroubleshootingTroubleshooting•• ·· Capillary Rheometer Capillary Rheometer •• Viscosity measurementsViscosity measurements•• ·· Extrusion and Melt System Extrusion and Melt System •• Design, Specification and StartDesign, Specification and Start--UpUp
•• ·· Polymer Film Design and Polymer Film Design and •• ManufactureManufacture•• ·· Microscopic Film evaluation and layer Microscopic Film evaluation and layer
thickness measurementthickness measurement•• ·· Film Surface TreatmentFilm Surface Treatment•• ·· Metallization of Polymer FilmsMetallization of Polymer Films•• ·· Customized InCustomized In--House Training House Training •• ClassesClasses
•• ·· Expert Witness and Intellectual Expert Witness and Intellectual •• Property SpecialistProperty Specialist•• ·· Literature Searches and Literature Searches and •• Technology ReviewsTechnology Reviews
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