Suzhou Gongsheng Import & Export Co., Ltd. is one of the most reliable manufacturers and suppliers of nylon film (bopa film) in China, featured by quality products and low price. If you're going to wholesale advanced nylon film (bopa film) made in China, welcome to get pricelist and free sample from our factory. We also accept customized orders.
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Nylon film - biaxially oriented polyamide 6 (BOPA) - is a tough, puncture-resistant film widely used in flexible packaging. The PA6 melt is stretched in both directions and heat set, producing a film with a useful combination of mechanical strength, puncture resistance and low-temperature flexibility for applications: vacuum packaging for meat and seafood, retort pouches, boil-in-bag constructions and frozen food lamination. Wherever a package gets pierced, frozen, boiled or squeezed, polyamide film is the layer that survives.
The product serves packaging through laminates, and the structure logic is worth stating. bopa film provides the mechanical spine - puncture strength, tear resistance, burst pressure - while a PE or CPP sealing layer welded to it provides the hermetic seal. nylon film for food packaging is almost always this two-layer system, and the film's oxygen barrier (excellent when dry) combines with EVOH or metallized layers when shelf-life targets demand it. Thickness runs 12μm to 30μm for standard laminating grades, 40μm+ for heavy retort and industrial uses.
Features & Material
The numbers that decide BOPA's place in packaging are mechanical and thermal. Tensile strength runs 180–260 MPa with high elongation that absorbs impact rather than shattering - the reason vacuum-packed bone-in meat ships without package failure. Puncture resistance is several times PET film's at equal gauge, and the film stays flexible and tough at -40°C, which is why frozen seafood and ready meals specify biaxially oriented nylon film rather than PET laminates. Boiling and retort survival is built in: specified retort grades can be designed and certified for 121°C retort processing, subject to the complete laminate structure and test requirements.
The honest engineering trade is moisture sensitivity, and it should be planned for rather than discovered. Nylon absorbs moisture - the film's oxygen barrier weakens as it hydrates, and dimensions move slightly - which is why high-barrier designs pair BOPA with a moisture-blocking layer and why our rolls ship in moisture-barrier packaging with handling guidance. For buyers, grade selection follows the process: standard laminating grades for vacuum and frozen; retort grades certified for 121°C; co-extruded and coated variants when the sealing layer needs integration. Applications: vacuum packaging, retort pouches, boil-in-bag, frozen food, cheese packaging, pharmaceutical laminates and industrial protective films.
Specifications
|
Parameter |
Specification |
|
Material |
Biaxially Oriented Polyamide 6 (BOPA / nylon 6) |
|
Thickness |
12μm / 15μm / 20μm / 25μm / 30μm / 40μm+ |
|
Width |
600–2000mm · slitting to customer spec |
|
Tensile Strength |
180–260 MPa (MD/TD) |
|
Elongation |
90–150% (MD) · 80–140% (TD) |
|
Puncture Resistance |
Substantially higher than PET for some grades at equal gauge; grade/test dependent |
|
Low Temperature Flexibility |
Flexible & tough at -40°C |
|
Retort Resistance |
Stable through 121°C retort (certified grades) |
|
Oxygen Barrier |
Excellent when dry (paired with moisture barrier in laminates) |
|
Surface |
Corona treated ≥52 dyn/cm · one/both sides |
|
Moisture Sensitivity |
Yes - barrier packaging + handling guidance supplied |
|
Application |
Vacuum packaging / Retort pouch / Boil-in-bag / Frozen food / Cheese & medical laminates |
Process Flow
PA6 Resin Drying → Melt Extrusion (Sheet Casting) → Chill Roll Quenching → Machine Direction Stretching (MDO) → Transverse Direction Stretching (TDO) → Heat Setting & Relaxation → Corona Treatment → Moisture-Conditioning & Equilibration → Slitting & Rewinding → Testing & Barrier Packing
Services
✓ Grade selection by process: vacuum / frozen / retort / boil-in-bag.
✓ Laminate structure consulting with sealing layer pairing (PE / CPP).
✓ Retort certification documentation per lot for 121°C programs.
✓ Corona level verification and width slitting to print-line spec.
✓ Sample rolls for vacuum and drop tests before line approval.
FAQ
Q1. Why choose bopa film over PET film for vacuum packaging?
A: Puncture and low-temperature toughness. At equal thickness, some BOPA grades can provide substantially higher puncture resistance than PET and retain useful flexibility at low temperatures - bone-in meat, frozen seafood and sharp-edged contents ship without failure. PET wins on dimensional stability and moisture barrier, which is why many premium laminates use both, each where it is strongest.
Q2. What does nylon film for food packaging actually contribute in a laminate?
A:The mechanical spine. BOPA carries puncture, tear and burst loads while the PE or CPP layer welded to it provides the hermetic seal. Removing the PA layer can reduce the mechanical protection of the package, depending on the complete laminate design even though the package still seals - the nylon layer is what survives the distribution chain.
Q3. How does moisture affect polyamide film performance?
A: Nylon hydrates over time: oxygen barrier weakens somewhat and dimensions shift slightly. The standard engineering answer is structural - pair BOPA with a moisture-blocking layer in the laminate - and logistical: we ship in barrier packaging with handling guidance so the film enters your line in spec condition.
Q4. Is BOPA film retort-safe?
A: Yes on certified retort grades. PA6 film holds mechanical properties through 121°C steam retorting, which is why retort pouches are a classic BOPA application. Not all grades are certified for retort, so the process target should be stated at order time and confirmed on the lot certificate.
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