Double-layer flat bag making machines1 generally cost between $4,600 and $17,200, depending on the machine's width, features, and level of customization. The price reflects the engineering complexity involved, particularly in relation to the film width (ranging from 600mm to 2000mm) and production functionality.
Basic models with narrower widths are suitable for small-scale operations and cost less. Higher-end machines that support wider films, automated features (like photoelectric tracking and automatic counting), and customized setups cost more.
The investment varies according to intended use. Machines built for standard HDPE bags fall on the lower end, while systems that include components like a punching unit for T-shirt bags or high-speed automation fall on the higher end. The goal is to align machine specifications with specific production needs for optimal return on investment.
What Types of Bags Can Be Made with a Double-Layer Flat Bag Making Machine?
These machines primarily produce bottom-sealed flat bags2 using HDPE, LDPE, or PP film. Optional modules, like a punching unit, allow the machine to produce T-shirt bags as well.
Core Product: Bottom-Sealed Flat Bags
These bags are created using a hot sealing knife for strong bottom seals and a cold cutting knife for separation.
- Food Industry: Bread, produce, and bulk packaging.
- Retail: Small items like hardware, books.
- Industrial: Small parts, samples, liners.
Adaptation: T-Shirt Bags
Adding a punching unit enables the machine to produce T-shirt bags by cutting out handles from the sealed tube, enhancing the machine’s versatility and market reach.
Material-Based Bag Types
| Material | Characteristics | Applications |
|---|---|---|
| HDPE | Crispy, strong, translucent | Grocery produce bags, thin trash liners |
| LDPE | Soft, flexible, tear-resistant | Bread bags, industrial-use bags |
| PP | Clear, stiff, high melting point | Clothing packaging, snack bags |
The machines accommodate these materials due to advanced temperature control and precision feeding.
How to Choose the Best Flat Bag Making Machine for Your Business
The right choice depends on matching your production needs with the right level of machine capability and support.
Key factors:
- Expected production volume
- Bag dimensions
- Film material type
- Budget
- Supplier support
1. Analyze Production Requirements
- Output Needs: Machines operate at speeds from 10 to 120 bags per minute per layer.
- Bag Size: Models support widths from 600mm to 2000mm. The 800mm standard model offers a max bag length of 2000mm.
2. Evaluate Material Compatibility
Different films require specific machine configurations. For example, thicker films may need stronger motors or specialized sealing knives. A typical setup might include a 1.5kW Yibang motor and Defr 1.5kW frequency converter.
3. Consider Automation and Features
| Feature | Business Benefit |
|---|---|
| Computer Control | Easy setup, reduced error |
| Automatic Counting | Simplifies batching and packaging |
| Photoelectric Tracking | Accurate cutting with printed films |
| Temperature Control | Consistent sealing performance |
4. Find a Reliable Manufacturer
Choosing a manufacturer with a track record of support and transparency is critical. Some offer spare parts kits, user manuals, and direct engineering support to ensure long-term performance.
Is a Double-Layer Machine Better Than a Single-Layer Machine?
In most high-volume operations, the double-layer model is more efficient. It processes two rolls of film simultaneously, doubling output without doubling operational costs.
| Factor | Single Layer | Double Layer | Two Single-Layer Machines |
|---|---|---|---|
| Operators Needed | 1 | 1 | 2 |
| Output | X | 2X | 2X |
| Floor Space | Y | ~Y | 2Y |
| Energy Use | Z | ~1.3Z | 2Z |
Double-layer machines are more efficient in terms of space, labor, and power consumption.
When Single-Layer Machines Make Sense
- Startups with limited capital
- Low to Medium Volume requirements
- Specialized Bags requiring frequent format changes
What’s the Difference Between Bottom Sealing and Side Sealing Machines?
Bottom sealing machines create a seal at the base of the bag and are ideal for bags that carry weight. Side sealing machines create vertical seals and are often used for packaging applications where presentation is a priority.
Bottom Sealing Process
- Film feeds in tube form.
- Hot brass knife seals the bottom.
- Cold knife cuts below the seal.
Application: Grocery bags, T-shirt bags, industrial liners.
Side Sealing Process
- Film folds in half.
- Heaters seal the sides.
- Cutter separates bags.
Application: Courier bags, laminated food pouches, bread bags.
| Feature | Bottom Sealing | Side Sealing |
|---|---|---|
| Seal Location | Bottom | Sides |
| Strength | High | Moderate |
| Main Use | Load-bearing bags | Pouches, laminated packaging |
| Examples | Flat Bag Machine | Lamination Pouch Machine |
Where to Find Flat Bag Making Machines for Sale Online
Machines can be sourced via marketplaces or directly from manufacturers.
1. Large B2B Platforms (Alibaba, Made-in-China)
Pros:
- Wide selection
- Transparent pricing
Cons:
- Quality varies
- Limited technical support
- Often resellers, not factories
2. Direct Purchase from Manufacturer (e.g., BagMec®)
Pros:
- Customization options
- Direct technical consultation
- After-sales support
- Transparent and detailed quotations
3. Used Machinery Sites
Pros: Lower cost
Cons: No warranty, potential mechanical issues, parts availability
Is It Worth Buying an HDPE/LDPE Automatic Bag Making Machine?
Yes. Automatic machines reduce labor, improve consistency, and cut down on waste.
Key Benefits
- Labor Savings: One operator oversees the entire process.
- Speed: Up to 120 bags/minute per layer.
- Precision: Digital control ensures uniform quality.
- Waste Reduction: Accurate sensors reduce film waste. Some users have reported up to 18% reduction in waste.
Can These Machines Produce Biodegradable Bags Too?
Yes. Machines can be configured to handle PLA and other biodegradable materials with adjusted temperature control and film tension settings.
Considerations for Eco-Films
- Heat Sensitivity: Requires precise control due to lower melting points.
- Film Tension: Needs smooth feed to prevent tearing.
With correct setup, these machines can support sustainable bag production, including compostable options.
Conclusion
Double-layer flat bag making machines, priced from $4,600 to $17,200, offer scalable, efficient solutions for high-volume bag production. Choosing the right supplier and machine configuration is key to achieving a strong return on investment.
