Created on 09.03
Vision Inspection for Glue Position and Thickness Control in Packaging Production
In adhesive application and laminated packaging production, applying glue is only part of the process.
Manufacturers also need to know whether the adhesive has been applied in the correct position and whether the coating is within the required thickness range.
When production speeds increase, checking adhesive quality manually becomes difficult.
This is where online vision inspection and adhesive measurement can become an important part of the production process.
KQ Automation develops adhesive automation solutions that combine adhesive application with online inspection for applications requiring glue position and thickness control.
Why Adhesive Inspection Matters
An adhesive application may look correct from a distance but still have problems that affect the final product.
For example:
- Glue position may shift.
- Glue width may change.
- Adhesive thickness may be inconsistent.
- Some areas may have insufficient adhesive.
- Excess adhesive may increase material consumption.
If these problems are only discovered after production, the manufacturer may need to deal with rejected products, rework or material waste.
Online inspection provides an opportunity to identify adhesive problems during production.
Glue Position Inspection
One important inspection target is adhesive position.
The inspection system can monitor the location of the adhesive layer relative to the defined production area.
For example, the system can detect:
- Glue edge position
- Glue center position
- Position deviation
- Whether the adhesive remains within the defined tolerance
The purpose is to determine whether the adhesive is being applied where it is supposed to be applied.
For laminated label applications, KQ's inspection concept specifically includes checking glue width and position on the liner material.
Glue Thickness Inspection
Position is only one part of adhesive quality.
The amount of adhesive applied can also influence the final product.
If the coating is too thin, the bonding performance may not meet the application requirement.
If the coating is unnecessarily thick, adhesive consumption can increase.
Therefore, thickness inspection can be used to monitor:
- Glue thickness
- Thickness uniformity
- Thickness deviation
- Whether the measured value is within the defined range
The actual inspection method depends on the adhesive, substrate, production speed and measurement requirements.
Online Inspection After Lamination
KQ's inspection solution can be applied to laminated web production.
One example is a three-layer structure consisting of:
Printed Paper + Adhesive + Silicon-Coated Liner
After the adhesive and material layers are processed, the inspection system can monitor the adhesive position and thickness.
The process can be organized as:
Hot Melt Glue Application → Lamination → Online Inspection → OK/NG Judgment → Data Recording
This allows inspection to become part of the production process rather than a separate manual quality-control operation.
Real-Time OK and NG Judgment
An online inspection system needs to turn measurement information into a practical production decision.
KQ's inspection concept includes OK/NG judgment.
For example:
OK
The measured glue position and thickness are within the defined tolerance.
NG
The glue position is outside the allowed range or the glue thickness is outside the specified range.
This type of judgment allows production personnel to identify abnormal adhesive application more quickly.
The actual tolerance values should be defined according to the customer's product and adhesive requirements rather than using one universal standard.
Data Recording and Traceability
For some production applications, inspection results are not only used for immediate quality judgment.
Production data may also need to be recorded for process analysis and traceability.
KQ's inspection concept includes data recording and traceability as part of the overall process.
This can help manufacturers understand:
- Whether adhesive application is stable
- When an abnormal condition occurred
- Whether position or thickness is drifting
- How production quality changes over time
The specific data structure and integration method should be configured according to the customer's production system.
Reducing Waste and Rework
One practical benefit of online inspection is the potential to identify adhesive problems earlier.
Without online inspection:
Production → Defective Product → Manual Discovery → Rework or Scrap
With online inspection:
Production → Inspection → OK/NG Judgment → Process Response
This does not automatically eliminate defective products, but it can provide earlier information about adhesive application problems.
For high-volume production, earlier detection can be valuable because a small process deviation can otherwise affect a large quantity of products.
Inspection for High-Speed Production
Manual inspection becomes increasingly difficult when the production line runs continuously.
An operator cannot realistically observe every adhesive section with the same level of consistency throughout an entire production shift.
Online inspection provides continuous monitoring of the defined inspection target.
KQ's inspection solution is designed around applications where manufacturers need real-time monitoring of glue position and thickness during production.
Combining Adhesive Application and Inspection
A major advantage of an integrated approach is that adhesive application and quality inspection can be considered together.
For example:
1. Hot Melt Glue Application
The adhesive is applied to the required substrate.
↓
2. Lamination
The material layers are combined.
↓
3. Vision Inspection
The system checks adhesive position and thickness.
↓
4. OK/NG Judgment
The system determines whether the measured result is within the defined range.
↓
5. Data Recording
Inspection information can be recorded for process monitoring and traceability.
This creates a more complete adhesive automation process.
What Applications Can Benefit From Glue Inspection?
KQ's documented inspection concepts are particularly relevant to laminated label and adhesive coating applications.
Potential inspection targets include:
- Glue position
- Glue width
- Glue thickness
- Thickness uniformity
- Position deviation
The exact inspection configuration depends on the material structure and production requirements.
What Information Is Required Before Designing an Inspection System?
A reliable inspection system should be designed around the actual production process.
KQ needs to understand factors such as:
- Product or web structure
- Material type
- Adhesive type
- Adhesive position
- Required glue width
- Required thickness range
- Production speed
- Existing production equipment
- Required data output
This information helps determine the appropriate inspection method and system configuration.
KQ's Adhesive Automation Philosophy
KQ's approach is to look at adhesive production as a complete process rather than treating application and inspection as completely separate functions.
The basic engineering logic is:
Product Structure → Adhesive Process → Application → Inspection → Quality Judgment
This allows the inspection system to be designed according to the actual adhesive application requirement.
Conclusion
Glue inspection becomes increasingly important when adhesive quality directly affects the final packaging product.
By monitoring glue position and thickness during production, manufacturers can gain better visibility into the adhesive process and identify deviations earlier.
KQ Automation provides adhesive automation solutions that combine hot melt adhesive application, online inspection, OK/NG judgment and data recording for suitable packaging and laminated material applications.
For manufacturers considering an adhesive inspection system, the first step should be to define what actually needs to be controlled:
Where should the glue be? How much glue should be applied? And what tolerance does the product really require?
Once these requirements are clear, the inspection solution can be designed around the real production process.
Ryan Liu
KQ Overseas Sales Representative
Website: https://en.keqi-auto.com/
Email: lc@keqi-auto.com
Tel / WhatsApp / WeChat: +86 18925560856
We are committed to excellence in everything we do and look forward to working with you!
We are committed to excellence in everything we do and look forward to working with you!
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+86 181 0293 8927
+86 189 2556 0856
+86 181 0293 8927
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luna@keqi-auto.com
lc@keqi-auto.com
luna@keqi-auto.com
lc@keqi-auto.com
No.8 Jinniu Street, Taigongling, Dalingshan Town, Dongguan City, Guangdong Province
No.8 Jinniu Street, Taigongling, Dalingshan Town, Dongguan City, Guangdong Province
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+86 1892556 0856
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