Cailong

Single-side PVDC coated biaxially oriented polyester (BOPET) film is produced by applying a polyvinylidene chloride (PVDC) coating​ onto the corona-treated surface​ of a standard BOPET base film. The opposite side remains non-corona treated​ (non-electrified surface).

PVDC is widely recognized for its exceptional barrier properties​ against gases (oxygen, nitrogen, carbon dioxide), water vapor, and aromas. When combined with the mechanical strength and dimensional stability of BOPET, the result is a high-performance packaging material suitable for demanding food and household product applications.

Key design note:​ The PVDC coating is applied only on the corona side to ensure uniform wetting and adhesion. The non-corona side is left untreated for specific converting requirements (e.g., heat-sealing or lamination with other substrates).

How It Compares to Other Barrier Coatings

Key Properties

1. Excellent Gas Barrier

• Low oxygen transmission rate (OTR) – protects oxygen-sensitive foods
• Effective barrier against nitrogen and carbon dioxide – maintains modified atmosphere packaging (MAP) conditions
• Extends shelf life significantly

2. Superior Oil Resistance & Aroma Retention

• PVDC coating resists penetration of oils and fats
• Prevents flavor loss and external odor ingress
• Critical for fatty foods (nuts, fried snacks, processed meats)

3. Good Water Vapor Barrier

• Low water vapor transmission rate (WVTR)
• Keeps dry products crisp and prevents moisture-induced spoilage

4. Good Printability & Transparency

• The PVDC-coated surface accepts inks well for high-quality reverse or surface printing
• High clarity allows product visibility (when combined with transparent sealant films)

5. Mechanical Strength of BOPET Base

• Excellent tensile strength, stiffness, and puncture resistance
• Good dimensional stability across temperature and humidity variations

Primary Applications

Food Packaging – Nuts & Ham

• Nuts (almonds, peanuts, cashews):​ High oil content requires oil barrier + oxygen barrier to prevent rancidity.
• Ham and processed meats:​ Needs oxygen barrier to maintain color and freshness, plus moisture barrier to prevent drying.

Food Packaging – Spicy Strips (Latiao) & Bread

• Spicy strips (latiao):​ Oil-rich, strongly flavored – PVDC’s oil resistance and aroma retention are essential.
• Bread and baked goods:​ Moisture barrier keeps bread soft; gas barrier extends mold-free shelf life.

Household Products – Mosquito Coil Wraps

• Mosquito coils contain volatile active ingredients that must be retained.
• PVDC coating prevents fragrance/active compound loss and blocks external moisture.
• Transparent film allows visual inspection of the coil.

Technical Specifications (Typical Range)

Note:​ Exact barrier values depend on PVDC coating formulation, coating thickness, and base film quality. Consult manufacturer datasheets for certified numbers.

FAQ (SEO Snippet Target)

Q: What is single-side PVDC coated BOPET film?​

A: It is a BOPET film with a PVDC coating applied to one side (the corona-treated side) for enhanced gas, moisture, oil, and aroma barrier, while the other side remains uncoated.

Q: Can PVDC coated BOPET be printed?​

A: Yes. The PVDC-coated side accepts printing inks well, making it suitable for reverse or surface printing in laminated packaging structures.

Q: Is PVDC coated film microwave-safe?​

A: Generally no. PVDC can degrade or char under microwave heating. For microwave applications, consider AlOx or SiOx coated films.

Q: What foods benefit most from PVDC coated BOPET?​

A: Foods high in oil or fat (nuts, fried snacks, processed meats), strong-flavored items (spicy strips, spices), and moisture-sensitive baked goods.

Q: Why use single-side coating instead of double-side?​

A: Single-side coating balances cost and performance. The uncoated side can be used for heat-sealing or lamination with other materials without affecting barrier properties.

Conclusion

Single-side PVDC coated BOPET film is a versatile, high-barrier transparent film​ that excels in applications requiring a combination of gas barrier, oil resistance, aroma retention, and printability. It is particularly well-suited for fatty and strongly flavored foods (nuts, ham, latiao) as well as household products like mosquito coil wraps.

For converters and brand owners seeking a cost-effective alternative to metallized or AlOx films​ where transparency and oil barrier are priorities, PVDC coated BOPET remains a reliable and widely adopted solution.