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Quad-seal (Stabilo) bag format and suitable products
The quad-seal bag format (also known as a four-corner seal, block-bottom, or Stabilo bag) is formed directly from roll film on a specialized vertical form-fill-seal system. Rather than creating a single vertical fin seal along the center back of the bag, the machine forms and heat-seals all four vertical corner edges before making the bottom and top cross-seals.
Suitable products include whole roasted coffee beans, specialty ground coffee, premium dry pet food and kibble, artisanal grains, granolas, and upscale dry snacks. For whole roasted coffee, an integrated ultrasonic or thermal one-way degassing valve applicator can be positioned upstream on the film web, allowing CO2 gas released by freshly roasted beans to escape while preventing ambient oxygen from entering the pack.
- Whole bean & ground coffee: degasses naturally via integrated one-way valves while maintaining complete aroma barrier.
- Specialty pet kibble: provides robust structural puncture resistance and premium retail shelf presence.
- Grains, pulses & granola: forms a neat rectangular brick profile that packs efficiently into secondary shipping cartons.
Bag size range and advantages over standard pillow bags
Bag dimensions are determined by the specific forming tube set, side crease irons and film pull stroke. Tooling typically accommodates face widths of 80mm to 200mm, side gusset depths of 40mm to 120mm, and package heights up to 380mm (covering common 250g, 500g and 1kg retail formats). Exact bag volume and former dimensions are verified with product density samples.
Compared to standard pillow bags, quad-seal bags provide three distinct commercial and structural advantages:
- Free-standing retail stability: the flat rectangular base and four rigid corner pillars allow the bag to stand upright independently on supermarket shelves without slouching, leaning or requiring display trays.
- Four uninterrupted display panels: with the seam relocated from the center to the corner edges, all four faces (front, back, left gusset, right gusset) provide flat, distortion-free graphic branding surfaces.
- Enhanced stacking & compression strength: the four sealed vertical corners act as structural columns, significantly increasing vertical top-load crush resistance during carton packing, multi-tier palletization and warehousing.
Applications and materials
This configuration serves the following products and applications. Our engineers review product behavior and pack requirements with representative samples.
- Commercial Coffee Roasters: Engineered for medium-to-high volume bagging of freshly roasted coffee beans into premium, self-standing quad-seal (four-side edge sealed) retail pouches.
- Specialty Coffee Brands.
- Contract Packaging (Co-packing) Facilities: Quick-change forming shoulder design allows contract packers to run multiple film materials, including matte finishes, heavy foils, and eco-friendly laminates.
- Coffee Supply Chains: Delivers rugged, reinforced corner-sealed pouches that optimize shipping carton space and withstand transit pressure during international distribution.
Configuration and scope
We develop the equipment configuration, tooling and integration around your product, pack format and production requirements.
Configuration items for engineering review
- Premium Vertical Quad-Seal (Stabilo) Coffee Pouch Packaging System
- Advanced Multi-Axis Servo Pulling
Machine features
Review these features with our engineering team to select the configuration for your product and packaging requirements.
- Four-Side Edge Ironing Control: Equipped with independent corner-heating bars that crease and seal the four edges of the laminate before forming. This ensures precise, crisp structural corners and a flat, non-rocking bag bottom.
- Online One-Way Degassing Valve Integration: Synchronized thermal-welding module automatically punches and seals internal degassing valves into the film during operation—critical for releasing CO2 without introducing room air.
- Advanced Multi-Axis Servo Pulling: Driven by independent Panasonic/Omron servo systems to handle thick, high-barrier laminates smoothly, preventing film slippage and ensuring precise artwork tracking.
Specifications and conditions
Our engineers develop an application-specific specification covering output, pack-size range, machine dimensions and utilities for your product and packaging format.
Request a specification review with your product details, pack format and target output.
How this fits the Vertical Form Fill Seal Machines process
Vertical form-fill-seal machines form bags from roll film around a forming tube, dose the product from above and seal each bag. The dosing unit, bag style and options such as gas flushing or coding define the scope of a configuration.
This machine is part of our Vertical Form Fill Seal Machines portfolio. Explore the configurations for other products and pack formats, or discuss a tailored arrangement with our engineering team.
This configuration is also listed on a page that compares the options for the same kind of product or machine.
The linked guides explain how this type of machine works and how to choose one.
Questions buyers ask about this configuration
Short answers to what buyers ask most often when they review a configuration.
How do I get output and dimensions for my product?
Our engineers develop an application-specific specification covering output, pack-size range, machine dimensions and utilities for your product and packaging format.
Can I test my product before ordering?
A representative sample test helps resolve material-specific questions before quotation. Please do not ship physical samples until the team has confirmed the quantity needed and where to send them.
Is this the configuration I would receive?
We configure the machine around your product, pack formats and production requirements. Our engineering review defines the model, equipment, options and operating conditions for your project.
What defines the scope of a Vertical Form Fill Seal Machines configuration?
Vertical form-fill-seal machines form bags from roll film around a forming tube, dose the product from above and seal each bag. The dosing unit, bag style and options such as gas flushing or coding define the scope of a configuration.
Engineering support
LINEVO engineers develop machine configurations and packaging-line interfaces around your production task. We bring application review, equipment selection and technical support into one project.
Product and packaging-material trials focus on the functions that matter for your application. Our team helps with configuration, operation, parameter adjustment and maintenance planning.
Review your application
Send the following to discuss this configuration. A representative sample test helps resolve material-specific questions before quotation.
- Product name and form (powder, granule, liquid, paste or solid pieces), with a sample or photos
- Target fill weight or volume, or the item count per pack
- Pack type and dimensions, and the packaging material you use
- Target output per minute or per shift
- Site utilities: voltage, phase and frequency, and compressed air
- Any upstream or downstream equipment the machine must connect to
What to send us
Send what you have and mark what is still undecided. Discuss your application with LINEVO.
| Item | Why we need it | Example format |
|---|---|---|
| Product and its behavior | Powder, granule, liquid, paste or solid pieces decide the dosing method and the parts that touch the product. | Free-flowing granules, with a photo of the product |
| Finished pack and fill | The pack style, its size and the fill per pack set the format and the dosing range. | Pillow bag, 100 × 150 mm, 50 g per bag |
| Target output | Output per minute or per shift decides the number of lanes and the model size. | 60 good packs per minute, one shift per day |
| Packaging material | Film or container type affects sealing, forming and the settings we confirm. | Laminated roll film, 250 mm wide, or the film datasheet |
| Site and destination | Power supply, compressed air and destination country decide the electrical and utility scope. | 380 V, 3-phase, 50 Hz, delivery to Germany |