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BOPA Film
BOPA stands for “Biaxially Oriented Polyamide”. Its base material is nylon (polyamide), produced through a sophisticated biaxial stretching process.
This biaxial stretching transforms the nylon molecular chains from a disordered state into a highly ordered, tightly packed network structure, giving BOPA film its unique and superior properties.
Extrusion Casting: Nylon chips are first heated and melted, then extruded through a die to form a thick sheet (cast film).
Longitudinal Stretching: The thick sheet passes through a set of preheated rollers and is then stretched between rollers of varying speeds, achieving longitudinal orientation of the molecular chains.
Transverse Stretching: The film then enters a tentering machine, where it is clamped on both sides at high temperatures and gradually widened in the transverse direction, achieving transverse orientation of the molecular chains.
BOPA Nylon Film: The “Invisible Champion” of High-Performance Packaging
Behind the dazzling array of commercial packaging lies a material highly favored for its exceptional performance, hailed as a “star member” of the high-performance packaging film family. This is BOPA nylon film (Biaxially Oriented Polyamide film). From mouth-watering cooked deli meats to long-lasting frozen foods, from exotic retort pouches to sturdy daily chemical packaging, BOPA film is ubiquitous. This article will provide an in-depth look at this important material.
Properties
- Top oxygen barrier (O₂TR 50–100 cm³/m²·d·atm)
- Superior puncture and pinhole resistance
- Resistant to acids, alkalis, and grease
Applications
- Fresh meat vacuum packaging
- Medical soft bags, IV bags
- High-barrier battery packaging
Common Thickness
- 10–50 μm
| BOPA Films Series | Common Thickness(micro) |
| Plain Film | 8-25 |
| Heat-Sealable Film | 15-25 |
| Retortable Film | 15-25 |
| Cold forming Film | 15-30 |
