4-Side Seal Bags

4-side seal bags have all four edges heat-sealed, providing significantly higher structural integrity than 3-side seal bags — with superior burst strength and drop resistance. Seal width can be customized based on product weight. Commonly made from PE/PA, PET/AL/PE, and PET/PE laminates with moisture barrier, high-barrier, and puncture-resistant properties. Ideal for heavy-duty applications: bulk food (large meat cuts, cheese blocks), industrial products (grinding discs, hardware tools), and medical devices.

📐 Specifications

Laminate Structure

PE/PA (high strength) / PET/AL/PE (barrier+strength) / PET/PE (clear reinforced) / Multi-layer co-extrusion

Seal Reinforcement

Standard seal / Wide seal (10–20mm) / Double seal / Serrated seal

Opening Type

Straight cut / Tear notch / Zipper / Slider zipper

Surface Finish

Gloss / Matte / Soft-touch / Anti-slip texture

🏪 Applications

⭐ Key Advantages

• ✅ Superior seal strength — All four sides sealed, 40%+ higher burst strength vs 3-side seal
• ✅ Heavy-duty capable — Load capacity up to 25kg for industrial-grade packaging
• ✅ Puncture resistant — PA laminate resists punctures from sharp hardware and tools
• ✅ Customizable seal width — Wider seals for heavier products ensure transit safety
• ✅ High-barrier options — Aluminum foil laminate blocks moisture, oxygen, and light
• ✅ Easy-open compatible — Reinforced construction with convenient V-notch tear opening