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Four-Side Seal Bags
Core Product Features
High Sealability & Protection
Low Oxygen Transmission Rate: Typically below 0.5cc/m²·24hr, ideal for vacuum packaging and moisture-sensitive products such as nuts and pet food.
Burst & Puncture Resistance: Even force distribution across four sides; puncture resistance exceeds 60N, suitable for sharp-edged contents like shelled nuts and frozen foods.
Anti-Oxidation & Anti-Static: Aluminum-coated composite materials (e.g., OPP, CPP, Nylon-Aluminum) provide oxidation resistance; anti-static design helps protect sensitive items like electronic components.
Structural Design & Space Efficiency
Cuboid Shape: Forms a cube-like structure after filling, increasing space utilization by 15–20% compared to flat pouches; ideal for bulky items such as noodles and baked goods.
Shelf Appeal: Three-dimensional shape enhances product presentation, suitable for premium items like tea, coffee beans, and pharmaceutical granules.
Compatibility & Material Flexibility
High Equipment Compatibility: Made from full-width film with low flatness requirements, ensuring stable machine performance; compatible with multi-unit four-side seal machines and cartoning systems.
Material Versatility: Supports OPP, PET, aluminum foil, and other composites, balancing barrier performance and cost efficiency.
Application Scenarios & Industry Use
Food Industry
Powders & Granules: Grains, dried fruits, tea, milk powder—products requiring moisture and oxidation protection.
Bakery & Snacks: Bread, cookies, nuts—items needing crisp texture retention, including vacuum-packed jerky and seaweed snacks.
Pet Food: Pet kibble, freeze-dried treats—requiring high seal integrity to extend shelf life.
Pharmaceuticals & Health Supplements
Granules & Powders: Cold remedy sachets, herbal powders—requiring precise dosing and strong sealing.
Supplements: Vitamin tablets, fish oil capsules—sensitive to moisture and oxidation.
Cosmetics & Industrial Use
Cosmetics: Foundations, eyeshadows—moisture-sensitive products enhanced by aluminum-coated barrier layers.
Electronics: Circuit boards, chips—requiring anti-static and dust-proof protection.
Emerging Fields
Eco-Friendly Packaging: Customizable with biodegradable materials (e.g., PLA composites), supporting sustainable packaging trends.
E-commerce Logistics: Large-capacity courier bags (e.g., PE, PP materials) for high-value goods, balancing protection and cost.
Comparative Advantages Over Other Bag Types
Feature | Four-Side Seal Bag | Three-Side Seal Bag | Back-Seal Bag |
Seal Integrity | Uniform heat seal on all sides; best sealing performance | Heat seal on three sides; moderate sealing | Hidden vertical seal; relatively weaker sealing |
Space Efficiency | Cuboid structure; high utilization | Can expand into 3D shape; high utilization | Flat structure; average utilization |
Production Speed | Moderate (single or multi-lane) | Slower (single-lane only) | Fast (multi-lane capable) |
Material Cost | Higher material usage | Moderate material usage | Up to 40% material savings |
Application Fit | High-seal, large-volume products | Large-volume, resealable products | High-speed production, visual display needs |
Four-Side Seal Bags
Core Product Features
High Sealability & Protection
Low Oxygen Transmission Rate: Typically below 0.5cc/m²·24hr, ideal for vacuum packaging and moisture-sensitive products such as nuts and pet food.
Burst & Puncture Resistance: Even force distribution across four sides; puncture resistance exceeds 60N, suitable for sharp-edged contents like shelled nuts and frozen foods.
Anti-Oxidation & Anti-Static: Aluminum-coated composite materials (e.g., OPP, CPP, Nylon-Aluminum) provide oxidation resistance; anti-static design helps protect sensitive items like electronic components.
Structural Design & Space Efficiency
Cuboid Shape: Forms a cube-like structure after filling, increasing space utilization by 15–20% compared to flat pouches; ideal for bulky items such as noodles and baked goods.
Shelf Appeal: Three-dimensional shape enhances product presentation, suitable for premium items like tea, coffee beans, and pharmaceutical granules.
Compatibility & Material Flexibility
High Equipment Compatibility: Made from full-width film with low flatness requirements, ensuring stable machine performance; compatible with multi-unit four-side seal machines and cartoning systems.
Material Versatility: Supports OPP, PET, aluminum foil, and other composites, balancing barrier performance and cost efficiency.
Application Scenarios & Industry Use
Food Industry
Powders & Granules: Grains, dried fruits, tea, milk powder—products requiring moisture and oxidation protection.
Bakery & Snacks: Bread, cookies, nuts—items needing crisp texture retention, including vacuum-packed jerky and seaweed snacks.
Pet Food: Pet kibble, freeze-dried treats—requiring high seal integrity to extend shelf life.
Pharmaceuticals & Health Supplements
Granules & Powders: Cold remedy sachets, herbal powders—requiring precise dosing and strong sealing.
Supplements: Vitamin tablets, fish oil capsules—sensitive to moisture and oxidation.
Cosmetics & Industrial Use
Cosmetics: Foundations, eyeshadows—moisture-sensitive products enhanced by aluminum-coated barrier layers.
Electronics: Circuit boards, chips—requiring anti-static and dust-proof protection.
Emerging Fields
Eco-Friendly Packaging: Customizable with biodegradable materials (e.g., PLA composites), supporting sustainable packaging trends.
E-commerce Logistics: Large-capacity courier bags (e.g., PE, PP materials) for high-value goods, balancing protection and cost.
Comparative Advantages Over Other Bag Types
Feature | Four-Side Seal Bag | Three-Side Seal Bag | Back-Seal Bag |
Seal Integrity | Uniform heat seal on all sides; best sealing performance | Heat seal on three sides; moderate sealing | Hidden vertical seal; relatively weaker sealing |
Space Efficiency | Cuboid structure; high utilization | Can expand into 3D shape; high utilization | Flat structure; average utilization |
Production Speed | Moderate (single or multi-lane) | Slower (single-lane only) | Fast (multi-lane capable) |
Material Cost | Higher material usage | Moderate material usage | Up to 40% material savings |
Application Fit | High-seal, large-volume products | Large-volume, resealable products | High-speed production, visual display needs |