What Is A Heat Seal?
- Thermoplastic material applied as a liquid coating, dried, tack, and block free.
- Heat activated by to become soft and tacky.
- Pressed to second substrate to make bond.
- Cooled to room temperature to form bond between layers of substrates.
Components of Heat Seals
- Defining resin or resins.
- Tackifier resins or additives.
- Lubricants, waxes, and slip modifiers.
- Antioxidants and stabilizers.
- Anti-blocking and heat stabilizing fillers.
- Solvents and diluents.
- Water, dispersants, pH control, and surfactants.
Chemistry
Solid Resin
- Ethylene Vinyl acetate (EVA).
- Modified EVA.
- Modified Polyolefin Copolymers.
- Modified Polyolefin Terpolymers.
- Polyester (PET).
- Modified PET.
Water Based
- EVA and Modified EVA
- Ethylene acrylic acid (EAA)
- Ethylene methacrylate (EMA)
- Ethylene methyl methacryalte (EMMA)
- Polyvinyl alcohol (PVOH)
- Ionomer
- Acrylic
- PVdC
Solvent Based
- EVA - Ionomer
- Vinyl - EMA
- PET - EMMA
- PVOH - Polypropylene (PP)
- Acrylic - Polyamide
Markets Served
- Food Pouches
- Medical
- Pharmaceutical
- Peelable Lidding
- Portion Packaging
- Industrial
- Instant Photograph
- Agricultural Containers
- Paper and Graphics
- Frozen Food Cartons
- In Mold Label
Market Trends
- Specific performance targets for specific applications.
- Higher peel and burst strength with strong seal through
- properties.
- Primerless HSC for foils.
- Freezer to oven easy peel lidding.
- Hot fill, aseptic, retort applications.
Heat Seals: New Developments
- Waterborne high porosity Heat Seal Coating–Platform technology for varying porosities and seal activation temperatures.
- Higher peel and burst strength with strong seal through
- Heat seal coatings for shrink label applications