What is Quad Seal Bag?
Quad seal bags, also known as corner seal bags, box pouches, or flat bottom pouches, are specialized packaging solutions designed with four reinforced corners at the base.
Application of Quad Seal Bag
In contrast to traditional gusset pouches, quad seal bags excel in retail and wholesale settings due to their upright stance and space-saving design. Their compact form maximizes shelf utilization, making them ideal for packaging a wide range of products:
- Food & Beverage: Coffee, tea, cereals, pet food, and flour
- Pharmaceuticals: Medical products requiring barrier protection
- Confectionery & Snacks: Sealed for freshness and easy access
| Product/Item | Type of Quad Seal Bag |
|---|---|
| Coffee | Window, foil metalized, or plantation-patterned bags |
| Tea | Foil or window bags for visibility |
| Pet Food | Square-bottom bags with E-zipper for resealability |
| Pharmaceuticals | Foil or bags with Aplix/velcro zippers |
Top 6 Benefits of Quad Seal Bag
1 Customizable Design
Featuring up to five printable surfaces (front, back, two gussets, and bottom), quad seal bags offer extensive branding opportunities. High-quality prints, 3D effects, and VI design strategies make them effective advertising tools.
2 Easy Shelf Storage
The rectangular base ensures bags stand steadily without tipping, allowing dense shelving. Even when half-full, the expandable gussets maintain an upright position, optimizing display space.
3 Superior Strength
Constructed from multi-layer laminated films (e.g., polyethylene, polyester, aluminum), these bags resist tearing and protect contents from external factors like moisture and UV light.
4 Cost-Effective
Compared to rigid packaging, quad seal bags use 30% less material, reducing production costs while maintaining premium aesthetics.
5 100% Emptying Capacity
Wide top openings enable complete product retrieval, making them ideal for powders, grains, and snacks. The design minimizes waste and enhances user convenience.
6 Optimal Product Protection
Laminated barrier layers (e.g., aluminum or VMPET) block oxygen, moisture, and light, extending shelf life for aroma-sensitive products like coffee and tea.
Add-on Features
1. Tin Tie Closures
Resealable tin ties allow users to roll down the bag, track product levels, and ensure secure transportation. Available in multiple colors, they maintain a uniform top edge.
| Size | Tin Tie Location | Length |
|---|---|---|
| 4 oz | 1″ from top | 4.75″ |
| 2 lb | 1.25″ from top | 7″ |
2. Hang Holes
- Ergonomic Handles: For easy carrying of heavy products
- Euro Punch Holes: Ideal for hanging displays in retail spaces
- Round Punch Holes: Enhances storage flexibility for small items
3. Degassing Valves
Essential for products that emit gas, such as roasted coffee, these valves release internal pressure without letting in oxygen:
- Wipf Valve: One-way design for consistent pressure regulation
- Goglio Valve: Elastic rubber construction for long-lasting performance
Types of Quad Seal Bags
1. Window Quad Seal Bags
Transparent panels let customers view contents, boosting trust for products like cereals and pet food. Learn more about customizable window designs.
2. Foil Quad Seal Bags
Multi-layer construction with aluminum barriers protects against heat, light, and moisture, suitable for coffee and tea. Discover our foil lamination options.
3. Kraft Quad Seal Bags
Eco-friendly kraft paper exterior with inner lamination offers a natural aesthetic, ideal for organic products. Explore our kraft material solutions.
4. Metalized Quad Seal Bags
Opaque, metallic-looking film blocks light for photosensitive items, often used in pharmaceuticals. Learn about metalized film technology.
5. Square-Bottom Bags with E-Zip
Resealable zippers and a stable base make these perfect for bulk foods like nuts and grains. Discover E-zip functionality for your products.
Material Choice
Quad seal bags typically feature a three-layer structure designed for optimal protection:
- Inner Layer: LLDPE for heat sealing and puncture resistance
- Barrier Layer: Aluminum or VMPET to block oxygen and moisture
- Outer Layer: PET, kraft paper, or OPP for durability and printability
Additional materials like EVOH enhance oxygen barrier properties, while rice paper adds an elegant texture. Foshan Ruihong Industry & Trade Co., Ltd. offers custom material laminations tailored to your product needs.
Production, Artwork, and QA
Foshan Ruihong Industry & Trade Co., Ltd. utilizes advanced automated machinery for precision manufacturing, including:
- Feeding Section: Rolls of material are fed through tension-controlled systems
- Sealing & Cutting: Heat-sealed gussets and precise cutting ensure uniform bag dimensions
- Printing: Rotogravure or flexographic printing applies vibrant, multi-color designs
Quality Assurance Testing:
- Tensile Testing: Measures material strength and durability
- Heat Seal Testing: Ensures seam integrity for prolonged shelf life
- Gas Chromatography: Verifies aroma retention and oxygen barrier efficiency
Packing, Filling, and Sealing
Vertical Form Fill Seal (VFFS) and Horizontal Form Fill Seal (HFFS) machines handle up to 300 bags per minute. For oxygen-sensitive products, Modified Atmosphere Packaging (MAP) flushes nitrogen gas before sealing to extend freshness.
Our packaging solutions include:
- Continuous VFFS packaging machines for high-speed production
- Intermittent motion VFFS machines for larger bag sizes
- Custom filling heads tailored to your product consistency
FAQs
Foshan Ruihong Industry & Trade Co., Ltd.
As a leading manufacturer based in China, we specialize in custom quad seal bags with advanced laminating and printing technologies. Our global clientele benefits from:
- Direct factory pricing for cost-effective solutions
- Tailored designs with custom add-on features like zippers and valves
- Eco-friendly, recyclable materials compliant with international standards
- Fast turnaround times and reliable global shipping
Contact us today to transform your packaging into a brand-building asset that combines functionality, durability, and visual appeal. Request a Quote