1. What Is BOPP Heat Seal Film?📌
BOPP Heat Seal Film (Biaxially Oriented Polypropylene Heat Sealable Film) is a high-performance flexible packaging material manufactured with premium polypropylene resin via advanced co-extrusion and biaxial stretching technology, serving as a mainstream functional film in the global flexible packaging industry.
Different from ordinary BOPP films, this functional film is coated with a modified heat seal layer on single or double sides. It enables direct heat sealing without extra adhesive coating, delivering high efficiency, cleanness and outstanding stability for industrial mass packaging production.
Featuring high transparency, stable heat seal performance and excellent processing adaptability, BOPP heat seal film is widely applied in food packaging, daily chemical packaging, gift wrapping, tobacco packaging and composite packaging structures.
2. BOPP Heat Seal Film Product Classification📂
The industry classifies BOPP heat seal films from two core dimensions: heat seal layer structure and surface appearance, meeting diverse packaging scenario requirements:
2.1 Classification by Heat Seal Layer Structure
✅ Single-Side Heat Seal Film
Comes with a functional heat seal layer on one side and a standard pure BOPP surface on the other side, featuring simple structure and strong practicality.
Core Advantages: Excellent printing adhesion, high transparency & gloss, compatible with lamination, hot stamping and UV surface decoration processes
Typical Applications: Snack food packaging, paper box wrapping, outer film wrapping for high-end gift boxes
✅ Double-Side Heat Seal Film
Equipped with professional heat seal layers on both sides, supporting multi-directional heat sealing and fully adapting to automatic packaging equipment.
Core Advantages: Flexible processing performance, tight & leak-proof heat seal, stable sealing effect in high-speed production
Typical Applications: High-speed food mass packaging, pillow bags, mini sachets, automatic wrapping production lines
2.2 Classification by Surface Appearance
✨ Glossy BOPP Heat Seal Film
Features ultra-bright and transparent surface with low haze, perfectly restoring the original color of products and enhancing shelf display effects.
Core Features: Ultra-high transparency, mirror surface gloss, clear product visibility, superior visual performance
Typical Applications: Candy packaging, biscuit outer packaging, cosmetic gift box packaging
🌫️ Matte BOPP Heat Seal Film
Adopts matte frosted texture with reduced light reflection, delivering soft visual effect and premium tactile feeling for high-end packaging positioning.
Core Features: Soft non-glare vision, high-end frosted touch, anti-reflection, scratch resistance
Typical Applications: Luxury gift packaging, high-end daily chemical products, premium retail outer packaging
3. Standard Thickness Specifications & Applications📏
Standard BOPP heat seal films cover a thickness range of 15μm～50μm with graded strength and scenario adaptability. Among them, 20-40μm is the most mainstream specification widely used in the global flexible packaging market.
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Film Thickness
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Core Characteristics
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Typical Application Scenarios
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15μm
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Lightweight, cost-effective, highly adaptable to high-speed pipeline production
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Small independent food packaging, inner substrate for composite packaging
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18μm
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Balanced strength and flexibility, universal and material-saving
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General snack food & daily chemical product packaging
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20-40μm
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Optimal combination of stiffness, transparency and mechanical strength with stable comprehensive performance
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Most mainstream flexible packaging scenarios (food, daily chemicals, gifts)
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45-50μm
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Ultra-high mechanical strength, excellent rigidity, tensile & deformation resistance
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Large-size product packaging, self-standing bags, independent molded packaging bags
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4. Core Performance Advantages💡
4.1 Stable & Reliable Heat Seal Performance
The custom modified heat seal layer solves common defects of traditional films such as high-temperature cracking, low-temperature sealing failure and edge leakage, compatible with full-range automatic packaging equipment.
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Low-temperature sealing: Initial sealing temperature below 115℃, energy-saving and efficient
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Strong seal strength: Stable heat seal strength of 3-14.2N/15mm (adjustable by formula)
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Durable performance: Resistant to seal failure and air leakage under variable temperature conditions
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Wide equipment compatibility: Suitable for horizontal flow wrappers, vertical form fill seal machines and full-automatic packaging lines
4.2 Excellent High-Speed Processing Performance
Uniform film tension and controllable friction coefficient eliminate jamming, cracking and feeding deviation in high-speed operation, greatly improving production yield.
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Smooth unwinding and stable feeding without stalling
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Anti-breakage in high-speed operation, reducing production downtime loss
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Lower energy consumption and significant packaging capacity improvement
4.3 Premium Optical & Printing Performance
Original low-haze and high-gloss properties, combined with corona pretreatment, deliver high-definition, vivid and full-color packaging printing effects.
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High transparency and low haze for clear product display
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Compatible with gravure printing, flexographic printing and other mainstream processes
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Superior ink adhesion with anti-peeling and anti-fading printing patterns
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