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3-Layer VS 4-Layer Flexible Packaging Structure & Functions
Created on 05.16
Title：3-Layer VS 4-Layer Flexible Packaging Structure & Functions
3-Layer Common Structure
- Outer Layer
Material: PET / BOPP
Function: Good printing effect, scratch resistance, surface protection, mechanical support
- Middle Barrier Layer
Material: AL / VMPET / EVOH / PA
Function: Block oxygen, moisture and light, reduce OTR, lock freshness
- Inner Sealing Layer
Material: PE / CPP
Function: Food safe, stable heat sealing, easy bag forming
4-Layer Enhanced Structure
- Outer Layer
Material: PET / BOPP
Function: Beautiful printing, wear-resistant, outer protection
- Reinforced Layer
Material: PA Nylon
Function: Great puncture resistance, toughness, anti-tear, improve drop resistance
- High Barrier Layer
Material: Aluminum Foil / EVOH
Function: Ultimate barrier performance, long shelf life, prevent oxidation
- Inner Heat-seal Layer
Material: PE / CPP
Function: Safe food contact, firm sealing, moisture-proof sealing
Core Difference
- 3-layer: Cost-effective, basic fresh-keeping, suitable for daily snacks, general food
- 4-layer: Higher strength + stronger barrier, anti-puncture, anti-fracture, suitable for meat, pet food, frozen food, high-grade food
Different layer designs meet different packaging demands. Choose suitable multilayer structure to perfect your product preservation!
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