Co-extruded Sealant Film
Description
Technical Parameters
Co-extruded Sealant Film functions as a multi-layer polyolefin sealant web engineered for lamination and hermetic heat sealing applications. This film serves as the primary food-contact or chemical-contact layer in multi-ply packaging structures such as PET/PE, OPP/PE, and Nylon/PE laminates. Converters and packaging engineers utilize this material to ensure secure pouch conversion, prevent seal leakage, and maintain package integrity across vertical and horizontal form-fill-seal packaging machinery.
Key Features
Low Seal Initiation Temperature: Seals at reduced thermal thresholds to protect heat-sensitive packaged contents and shorten packaging line dwell times.
High Hot Tack Strength: Maintains immediate seam resistance while the polymer remains molten, preventing package failure during high-speed vertical filling cycles.
Controlled Coefficient of Friction: Regulates surface slip properties to enable smooth web handling without blocking or dragging across automated converting equipment.
Multi-Layer Structural Stability: Integrates tailored polyolefin resin layers into a unified web to balance puncture resistance and interlayer bond strength.
Applications
Laminated Pouch Converting: Applied as the dedicated inner sealing web for stand-up pouches, three-side seal bags, and zipper pouches in dry food, snack, and pet food markets.
Form-Fill-Seal Packaging Lines: Integrated into automated horizontal and vertical form-fill-seal equipment handling powders, granules, and consumer goods.
Specialized Barrier Structures: Combined with polyester, nylon, or foil outer webs to package moisture-sensitive or oxygen-sensitive contents, subject to specific factory compliance verification.
Materials & Specifications
|
Parameter |
Technical Specification / Range |
|
Base Polymer |
Polyethylene (LDPE, LLDPE, mLLDPE co-extruded resin blends) |
|
Thickness |
25 µm to 120 µm |
|
Width |
200 mm to 1500 mm |
|
Surface Tension |
Corona treated side ≥ 38 dynes/cm |
|
Density |
0.918 g/cm³ to 0.935 g/cm³ |
|
Coefficient of Friction |
Static ≤ 0.25 / Dynamic ≤ 0.20 |
|
Core Inner Diameter |
76 mm (3 inch) or 152 mm (6 inch) |
How to Choose
Select the appropriate film specification by providing your existing laminate construction, total package weight, target sealing temperature, and machine operational speed. Specifying the target contents-such as liquids, powders, or sharp items-allows for precise matching of film thickness, seal initiation temperature, and resin formulation.
FAQ
Q: How does co-extruded sealant film differ from mono-layer film?
A: Co-extruded films integrate multiple functional resin layers into a single extrusion run. This structure isolates low-temperature sealing characteristics on the inner face while maintaining stiffness and slip control on the outer face, a performance balance mono-layer films cannot achieve.
Q: What specific metrics should be tested during sample evaluations?
A: Trial evaluations should focus on seal initiation temperature ranges, dwell time compatibility, seam strength after cooling, and web feeding consistency under operational machine speeds.
Q: What technical documentation accompanies material orders?
A: Every production batch includes a Certificate of Analysis and Technical Data Sheet confirming thickness tolerances, surface energy, tensile properties, and food contact compliance documentation.
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