Definition
A sealing method that uses heat, pressure, and dwell time to fuse thermoplastic layers into a closed package.
Applications
- Pouches
- Lidding films
- FFS roll stock
- Medical pouches requiring validated seals
Benefits
- Creates strong, tamper-evident closures
- Supports high-speed packaging
- Enables hermetic sealing
Industry Examples
- Medical: validated heat seals for sterile pouches with peelable seals.
- Industrial: strong heat seals for chemical packs requiring leak resistance.
- Electronics: forms hermetic seals in MBB pouches to maintain low internal humidity with desiccant systems.
FAQ
Q: What drives seal failures?
A: Incorrect temperature/pressure/dwell, contamination, or incompatible sealants.
Q: How do you widen the seal window?
A: Choose appropriate sealant resin and optimize SIT and dwell.