The heat-seal BOPP film is a type of biaxially oriented polypropylene film that has undergone special surface treatment or co-extrusion modification to endow it with its own heat sealing capability. It addresses the core problem that ordinary BOPP films cannot be directly heat-sealed.
Its emergence has enabled BOPP to form complete packaging bags using a single material, significantly simplifying the production process, shortening the workflow, and reducing costs. By endowing the film surface with heat-sealing ability, it greatly expands the application scope of BOPP.
Although it is inferior to multi-material composite films in terms of barrier properties and content resistance, in its extensive application market, it has emerged as an ideal and cost-effective choice for manufacturing various high-end product packaging bags and protective bags, thanks to its comprehensive advantages of high transparency, high stiffness, and heat sealing capability.
The heat-seal BOPP perfectly combines the inherent advantages of BOPP with the convenience of heat sealing.
1. Self-sealing capability
This is its most crucial advantage. It can directly seal bags and caps on high-speed automatic packaging machines without the need to combine with heat-sealing materials such as CPP, thus simplifying the packaging structure.
2. Excellent optical properties
It inherits the characteristics of high transparency and high glossiness of BOPP, enabling it to fully display the contents and enhancing the attractiveness of the shelves.
3. Excellent mechanical properties
It possesses the inherent high stiffness and high strength of BOPP film, running smoothly on high-speed packaging machines and not prone to stalling.
4. Outstanding processing performance
Excellent printing adaptability: After surface treatment, it can directly undergo high-definition printing, with vivid and bright patterns.
Good anti-static and smooth properties: Suitable for high-speed packaging, easy to open.
5. Economical and efficient
Although the unit price may be higher than that of ordinary BOPP, by simplifying the packaging structure and eliminating the composite process, it can significantly reduce the overall packaging cost and improve production efficiency.
Product Name | Heat seal BOPP | |||
Testing Item | Unit | Value | Testing Method | |
Thickness | μm | 18~20 | GB6672-2001 | |
Tensile Strength | MD | Mpa | ≥120 | ASTM D882 |
TD | Mpa | ≥ 200 | ||
Elongation at break | MD | % | ≤ 240 | |
TD | % | ≤ 80 | ||
Heat shrinkage | MD | % | ≤ 4.0 | ASTM D1204 |
TD | % | ≤ 2.0 | ||
Haze | % | ≤3.0 | ASTM D1003 | |
Gloss 45° | % | ≥85 | ASTM D2457 | |
Heat Seal Strength (125℃） | N/15mm | ≥2.5 | ASTM F88/F88M | |
C.O.F. | Treated side | - | ≤ 0.4 | ASTM D1894 |
Untreated side | - | ≤ 0.4 | ASTM D1894 | |
Wetting Tension | Treated side | mN/m | ≥38 | ASTM D2578 |
