Three-layer packaging typically refers to flexible laminated films or pouches constructed from three distinct layers, each serving a purpose: product contact, barrier/strength, and print/abrasion protection. This construction is common in snack pouches, medical sachets, and specialized barrier films.
Typical structure of a 3-layer laminate
- Inner layer (sealant/product contact): Polyethylene (PE) or another food-safe sealant that ensures hermetic seals and food safety.
- Middle layer (barrier): EVOH, aluminum foil, or PET provides oxygen, moisture, and aroma barrier to extend shelf life.
- Outer layer (print and protection): PET, PP, or metallized films for mechanical strength, printable surface, and abrasion resistance.
Benefits and applications
3-layer laminates balance cost and performance: enhanced shelf life, puncture resistance, and attractive printing for branding. Common uses include food pouches, pharmaceutical sachets, flexible barrier liners for industrial chemicals, and medical device packaging.
Design considerations
- Choose sealant compatible with the product (food-safe, non-reactive).
- Balance barrier requirements (oxygen/moisture) with recyclability — rPET and mono-material solutions are gaining traction.
- Ensure printing and branding needs are met on the outer layer for retail impact.
Conclusion
Three-layer packaging is a versatile, cost-effective solution for many industries where product protection and shelf-life are important. Advances in materials and recycling are creating more sustainable 3-layer options for the Philippine market.