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Primerless Heat Seal Coatings for Film Substrates
Ginger CushingBusiness Development Manager
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Agenda
Aqueous heat seal coatings for film– Desirable properties– Conventional technology
Primerless coatingsOther propertiesSummary
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Heat Seal Coating for Film: Desirable Properties
Wide heat seal temperature rangeHigh hot tack throughout the rangeGood bond strength and adhesionEase of processingAppearanceFood contact compliance
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Conventional Technology
Traditionally double-coating systems
Prime
Dry
Coat
Dry
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Conventional Technology
Polyethylene Acrylic Acid (EAA)AcrylicsPolyvinylidene Chloride (PVdC)
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EAA
Good for face-to-face (A/A) sealsTransparentHigh hot tackLow seal initiation temperature (SIT)Broad seal windowLow melt viscosity – Facilitates chain mixing during heat seal
May be heat sensitive at elevated temperatures
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Acrylics
Good for both A/A and A/B heat sealsTransparentCompared to EAA– Higher SIT– Narrower heat seal range– Lower hot tack
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PVdC
Contributes oxygen and moisture barrierCompared to EAA and Acrylics– A/A seals– Higher SIT– Lower hot tack – Heavier coat weights required (2 – 3x)– May discolor over time
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Conventional Heat Seal Coatings
Polyethylene Acrylic Acid (EAA)AcrylicsPolyvinylidene Chloride (PVdC)
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Primerless Heat Seal Coating
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INNOVATION
Single componentLower seal initiation temperatureBroader heat seal windowNo primer required
Coat
Dry
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Hot Tack Comparison of Aqueous Coatings
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Hot Tack Measurement
Tested to ASTM F1921-98Tests immediate bond strength as the bond exits the heat sealer (measured in g force)Important in determining packaging speed, sealing conditions, and variety of packaging equipment that can be used
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Comparison of Coatings on 29µ BOPP film
0
50
100
150
200
250
300
350
400
450
50 70 90 110 130 150
Temp, deg C
Forc
e, g
HS-FILM Acrylic EAA PVdC
Minimum SIT
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Water Based Heat Seal Coatings Summary(Metric)
SAMPLE Dry Coat Weightg/m2
Minimum Heat Seal Initiation Temp °C
BOPP/HS-FILM 1 60BOPP/Primer/EAA 1 68BOPP/Primer/Acrylic 1.5 104BOPP/Primer/PVdC 3 114
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Water Based Heat Seal Coatings Summary(English)
SAMPLE Dry Coat Weightlb/3000 ft2 ream
Minimum Heat Seal Initiation Temp °F
BOPP/HS-FILM 0.6 140BOPP/Primer/EAA 0.6 154BOPP/Primer/Acrylic 0.9 219BOPP/Primer/PVdC 1.9 237
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Hot Tack Comparison to(Co-)Extruded Resins
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HS-FILM
Comparison of Heat Seal Coatingsto Extruded Resins
0
100
200
300
400
500
600
50 70 90 110 130 150
Temp, deg C
Forc
e, g
Ionomer 18% EVA LLDPE
Minimum SIT
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Extruded Heat Seal Coatings Summary(Metric)
SAMPLE Dry Coat Weightg/m2
Minimum Heat Seal Initiation Temp °C
HS-FILM 1 60
EVA (18%VA) 12 82
Ionomer 12 97
LLDPE 12 102
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Extruded Heat Seal Coatings Summary(English)
SAMPLE Dry Coat Weightlb/3,000 ft2 ream
Minimum Heat Seal Initiation Temp °F
HS-FILM 0.6 140
EVA (18%VA) 7.5 180
Ionomer 7.5 207
LLDPE 7.5 216
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Can a thin layer of solution-applied heat seal coating be an alternative to heavier coat weights of sealants applied via (co)-extrusion?
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Other Properties Exhibited by Primerless Heat Seal Coating
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Adhesion
Excellent adhesion to treated, unprimed:– BOPP– BOPET– BOPA– Cellulose– PLA
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Orientation
Survives the in-line stretching process
MDO TDO
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And more…
Optically clear, transparentFood compliant
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Summary – Primerless Heat Seal Coating Characteristics
Strong substrate adhesionExcellent hot tack propertiesLow seal initiation temperatureBroad heat seal windowClarityStretchabilityFood compliance