3-Side Seal Bags

3-side seal bags are the most classic and widely used bag style — three edges are heat-sealed and one edge remains open for filling. The simple, efficient construction makes them the most cost-effective option. Fully compatible with horizontal and vertical form-fill-seal (FFS) automated packaging machines. Widely used for food (seasoning powder, instant coffee, ramen seasoning sachets), seeds, detergent refill packs, shampoo samples, and pharmaceutical granules. Available in multiple laminate structures with custom color printing.

📐 Specifications

Laminate Structure

Single PE (economy) / OPP+PE (glossy) / PET+PE (strong) / PET+AL+PE (high-barrier)

Bag Style

Flat 3-side seal / Gusseted (high volume) / Envelope style / Box-style

Seal Type

Standard heat seal / Easy-tear V-notch / Serrated tear / Reinforced wide seal

Surface Finish

Gloss / Matte / Soft-touch / Spot varnish

🏪 Applications

⭐ Key Advantages

• ✅ Most cost-effective — Simple construction with lowest per-unit cost at scale
• ✅ High production speed — In-line sealing and cutting at 60–120 bags/min
• ✅ Automation-ready — Compatible with all major horizontal & vertical FFS machines
• ✅ Flexible material choice — From economical single-layer PE to high-barrier foil laminate
• ✅ Wide size range — From mini sachets to large industrial part bags
• ✅ Food-grade available — Inner layer food-grade PE meeting international standards