Manual adhesive application is slow and often inconsistent, leading to production delays and unreliable seals. Modern courier bag machines1 address this issue through full automation.
Yes, current-generation courier bag making machines can automatically apply adhesive strips. Systems like the BagMec® series use hot-melt adhesive units2 that apply single or double glue lines with precision, ensuring consistent sealing quality and efficient high-speed production3.
This automation is essential for large-scale operations in logistics and e-commerce. A dedicated adhesive unit, integrated into the system and controlled via PLC (programmable logic controller4), handles the process. It melts adhesive, applies it to the film at the right moment, and overlays it with a release liner—all synchronized with the bag production cycle. The result is a strong, tamper-evident adhesive strip5 placed perfectly on each bag.
Key Components of the Adhesive System
- Hot-Melt Tank: Heats solid glue into a liquid.
- Precision Pump & Nozzle: Applies glue evenly to the moving film.
- Liner Placement Mechanism: Covers the glue with a silicone release liner.
- Smart Tension Control: Keeps film and liner aligned, preventing misapplication.
How the Automatic Adhesive Application System Works
Here's a breakdown of how adhesive is applied inside the machine:
Solid adhesive is melted in a heated tank, pumped through a nozzle, and applied in a line on the bag film. A release liner is then placed on top. The PLC controller synchronizes the entire process with the bag-making cycle.
Main Steps:
- Film Feeding: Film is pulled from a roll. Smart tension control keeps it flat.
- Glue Melting & Pumping: Adhesive is heated to the correct viscosity and pumped toward the nozzle.
- Application: Glue is applied as a continuous strip using PLC timing.
- Liner Placement: A roller places the liner directly over the glue.
- Sealing & Cutting: The bag is sealed and cut to final size.
What Types of Adhesive Are Compatible?
Most courier bag machines1 use hot-melt adhesives (HMAs), but some are configurable for pressure-sensitive tapes6 depending on the application.
Hot-Melt Adhesives (HMA)
- Operation: Melted in-machine and solidify quickly on contact.
- Strength: Strong, permanent bond ideal for tamper-evident courier bags.
- Benefits: Fast bonding, cost-effective in bulk, supports high-speed production.
Pressure-Sensitive Tapes (PST)
- Operation: Pre-made double-sided tapes with built-in liners.
- Use Case: Common in returnable mailers for e-commerce.
- Flexibility: Allows dual-strip setups—one for sealing, one for returns.
Comparison Table
| Factor | Hot-Melt Adhesive (HMA) | Pressure-Sensitive Tape (PST) |
|---|---|---|
| Typical Use | Secure, single-use bags | Returnable and special-function bags |
| Bond Strength | Permanent, high-strength | Adjustable, typically less permanent |
| Speed | Very high | High, limited by tape roll changes |
| Cost Efficiency | Lower material cost | Higher cost due to pre-made tape |
| Customization | Excellent for security seals | Good for user-returnable designs |
Is Adhesive Strip Placement Customizable?
Yes, modern machines allow full customization of strip position, size, and quantity through a touchscreen PLC interface.
How It Works:
- PLC Interface: Operators can easily set glue strip start/stop points, width, and distance from the edge without mechanical changes.
- Adjustable Hardware: Applicators and liner rollers are mounted on movable brackets for custom setups.
Example Use Cases:
- Standard Mailer: One adhesive strip with release liner.
- Returnable Bags: Two strips—one for delivery, another for return.
- High-Security Bags: Wider adhesive area or colored glue to detect tampering.
What’s the Impact of Automation on Production and Cost?
Automated machines can produce over 2,000 bags per hour while cutting labor, reducing waste, and improving consistency—leading to a faster return on investment.
Speed Improvements:
- Manual Output: A few hundred bags per hour, inconsistent results.
- BagMec® Machines:
- Standard: Up to 1,200 bags/hour.
- High-Speed: Up to 2,500 bags/hour.
Cost Breakdown:
| Cost Factor | Manual Process | Automated Process (BagMec®) |
|---|---|---|
| Labor | Multiple operators required | One operator can oversee the whole line |
| Material Waste | High due to errors | Minimized by precise application |
| Quality Control | Needs inspection staff | Built-in consistency reduces returns |
| Energy Use | Generally inefficient | Servo motors save up to 30% in power |
Conclusion
Courier bag machines can apply adhesive strips automatically and accurately. This automation plays a vital role in modern packaging—delivering higher speed, better quality, and lower operating costs. Whether your focus is security, return logistics, or production scale, automated adhesive systems help streamline operations and improve results.
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Explore how courier bag machines enhance efficiency and quality in packaging. ↩ ↩
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Learn about the technology behind hot-melt adhesive units and their advantages. ↩
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Explore the benefits of high-speed production for cost savings and efficiency. ↩
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Discover the role of PLCs in automating processes and improving production efficiency. ↩
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Find out how tamper-evident strips enhance security in packaging. ↩
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Understand the versatility of pressure-sensitive tapes in various packaging applications. ↩
