`PET/AL/PA/RCPP 4‑Layer Aluminum Foil Retort Bags for 121℃ Autoclave Sterilization`
| Materials | : PET/AL/PA/RCPP |
| Process | : Multi-layer composite |
| Thickness Range | : Customized |
| Width Range | : Customized |
| Color | : Up to 10 colors |
| Shape | : 3 sides sealing |
| Appearance | : High barrier |
Description
Product Overview
Aluminum foil layer fully blocks ultraviolet light, oxygen and moisture. It eliminates photo‑oxidation spoilage for food goods.
Suitable for autoclave high‑temperature sterilization, achieve long shelf‑life without refrigeration.
Material Structure Analysis
Structure：PET / AL (Aluminum Foil) / PA (Nylon) / RCPP (Retort‑grade Cast Polypropylene)
1. PET outer layer: Good surface stiffness, supports gravure printing, anti‑abrasion during logistics.
2. AL aluminum foil barrier layer: Core functional layer, near‑zero oxygen & light transmittance.
3. PA nylon middle layer: Boost puncture resistance, resist sharp food fragments piercing.
4. RCPP inner sealing layer: Retort‑resistant heat‑seal layer, stable under 121℃ high‑pressure cooking, no delamination.
Note: This 4‑layer aluminum foil structure cannot be transparent. If you need see‑through pouch, choose PA/RCPP transparent retort bags.
Technical Specification Table
| Testing Item | Standard Parameter |
|---|---|
|
Material Structure |
PET / AL / PA / RCPP 4‑layer lamination |
|
Max Sterilization Temperature |
121℃, 30‑45min autoclave retort processing |
|
Total Film Thickness |
110μm‑140μm |
|
Oxygen Transmission Rate (OTR) |
≤0.05 cm³/(㎡·24h·atm) |
|
Water Vapor Transmission Rate |
≤0.03 g/(㎡·24h) |
|
Heat‑seal Temperature Range |
170‑210℃ |
|
Heat Seal Temperature Range |
180℃-220℃ |
|
Available Size |
Custom width 80‑500mm, custom length 120‑800mm |
|
Printing Option |
Gravure custom printing up to 9 colors |
|
Application Environment |
Room‑temperature shelf storage after retort sterilization |
Core Product Advantages
- Ultimate barrier performance: Aluminum foil isolates light, oxygen and moisture, greatly extend product shelf life.
- Excellent mechanical property: Nylon layer improves tear‑proof & puncture‑proof performance, adapt to hard‑texture food with bone or shell.
- Stable retort performance: RCPP inner layer resist high‑pressure steam, avoid delamination, seal burst after retort.
- Customizable solution: Multiple sizes, thickness, printing artwork to match buyer’s packing line.
Typical Application Scenarios
Ready‑to‑eat cooked meat, braised food, poultry products, seafood, stewed dishes, high‑value pickled goods, military ration food, special‑condition long‑term preserved food.
Important Usage Notes
- Must match industrial high‑pressure retort kettle for 121℃ sterilization. Ordinary household boiling cannot reach sterilization requirement.
- Avoid sharp object scratch the bag surface before filling. Damaged aluminum foil will lose barrier function.
- Seal parameter need fine‑tune according to actual packing machine, prevent false seal.
- Cannot observe inner food status, if visual inspection is required, select transparent retort pouch solution.
Frequently Asked Questions
Q1: What is the difference between aluminum foil retort bag and transparent PA‑RCPP retort bag?
A: Aluminum foil type achieves ultra‑low oxygen & light transmission for longer shelf‑life, but non‑transparent. Transparent PA‑RCPP can view contents, barrier capability is weaker than aluminum foil version.
Q2: Can this bag handle 135℃ ultra‑high temperature retort?
A: Standard PET/AL/PA/RCPP fits 121℃. For 135℃ high‑retort requirement, material formula needs to be adjusted, please contact our sales team.
Q3: Is custom printing available?
A: Yes, gravure printing service is supported, MOQ depends on bag dimension.
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Food-Grade Raw Materials
In an era where food safety is highly valued, packaging safety is equally important. Our company recognizes this and is committed to producing high‑quality flexible packaging pouches. All our pouches are made from food‑grade materials that have passed strict screening and multiple inspections, meeting or exceeding national and international food‑contact standards. We never use recycled materials and strictly follow food production requirements without compromise. Choosing our flexible packaging means choosing safety and reliability. Whether for snacks, fresh produce, or beverages, our pouches provide a secure protective barrier, giving your consumers peace of mind and helping you grow your business with confidence.
Process Reference
Packaging bag performance varies significantly by raw material—BOPP delivers excellent tensile strength and transparency, PET provides superior moisture and oxygen barrier properties, PE excels in flexibility and impact resistance, and composites integrate multi-substrate advantages for specialized demands. Backed by advanced production lines and a professional R&D team, we deliver tailored packaging, with flexible adjustments to dimensions, thickness, structural designs (single-layer, multi-layer composite, zipper-sealed) and functional upgrades (puncture resistance, UV protection, heat-sealability). Our state-of-the-art printing equipment supports high-precision 10-color printing with food-grade, eco-friendly inks meeting international standards, ensuring vivid colors, sharp patterns and consistent quality to satisfy diverse needs from brand logos and product details to
Company Advantages
58fully automatic bag-making machines
5×10-Color High-Speed Printing Machines
Eight large-scale film-forming devices
Customizable
Flexible Packaging Bags FAQ：
- Bag type (stand up pouch, flat bag, zipper bag, three-side sealed bag, etc.)
- Bag size and thickness
- Order quantity
- Surface finish (glossy, matte, metallic, paper texture, etc.)
- Printing artwork or color requirements
- Any special functional requirements (food grade, waterproof, moisture-proof, etc.)
- Digital printing small batch orders: 5–7 working days
- Standard formal bulk orders: 15–20 working days
- Express door-to-door delivery
- Sea freight
- Air freight
- Railway transport
- Delivery to your designated Chinese warehouse or agent
- Bank wire transfer (T/T)
- Credit card payment
- PayPal, Alipay and other third-party payment platforms
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