Designfax weekly eMagazine

Subscribe Today!

Archives

View Archives

Partners

Manufacturing Center
Product Spotlight

Modern Applications News
Metalworking Ideas For
Today's Job Shops

Tooling and Production
Strategies for large
metalworking plants

Thermal imaging on the quality control line

On a high-speed food and beverage line, small errors rarely stay small across the wider production environment.

A slightly underfilled tray. A seal that doesn't fully bond. A trace of product caught where it shouldn't be.

Individually, they seem minor, but multiplied across thousands of units per hour, they turn into waste, rework, complaints, and sometimes even recalls. When that happens, it's not just the business that feels it. Production teams face pressure. Quality managers answer difficult questions. Consumers lose trust.

Small errors rarely stay small on a high-speed food and beverage line. [Credit: Image courtesy of Flir]

 

 

Many manufacturers still rely heavily on visual inspection to catch these issues. However, the reality is simple. What you can see is not always what is happening.

The real risk on the filling line
Filling and sealing are deceptively complex stages because speeds are high, materials vary, and environmental conditions can shift throughout the day. Even minor temperature inconsistencies at the seal point can affect integrity.

Manual inspection and standard vision systems have their place, but they have limits; sampling means some packs are never checked. Operators rotate. Fatigue sets in. Opaque or multilayer packaging hides defects that traditional cameras cannot easily detect.

Weak or contaminated seals compromise shelf life and, in the worst cases, food safety, highlighting the importance of seal integrity monitoring.

When an issue escapes the line, the consequences move fast. Production stops, stock is quarantined, and teams work late to contain the damage. However, it doesn't end at the factory gates; products may be pulled from shelves, customers inconvenienced, and in serious cases, consumers put at risk. The financial cost is visible, and the human cost is felt.

Quality control without blind spots
Thermal imaging adds a different layer of control. Instead of relying on surface appearance, it measures heat distribution as seals are formed and products move through the line.

The Flir A70 Smart Sensor captures detailed thermal patterns at production speed. Variations in temperature highlight underfills, trapped product in the seal area, and inconsistent sealing pressure -- even through opaque or printed packaging.

The Flir A70 Smart Sensor captures detailed thermal patterns at production speed. [Credit: Image courtesy of Flir]

 

 

This is not sampling. It is continuous, 100% in-line inspection. Every pack. Every cycle. No sampling gaps. Defects can be rejected immediately, before they progress further downstream or leave the facility, reducing surprises.

From checking to controlling
When thermal inspection is integrated into existing control systems, quality shifts from reactive checking to process control.

Data feeds directly into the plant's existing platforms, creating a clear, auditable record and supporting HACCP and BRCGS requirements. Edge processing ensures decisions happen instantly, without slowing the line.

When thermal inspection is integrated into existing control systems, quality shifts from reactive checking to process control. [Credit: Image courtesy of Flir]

 

 

For operations teams, the impact is practical and measurable:

• Less product giveaway
• Fewer seal-related rejects
• Reduced rework and downtime
• Stronger compliance documentation
• Greater confidence during audits

Most importantly, it reduces the stress that comes with uncertainty. When operations teams can see exactly what is happening at the seal point, they make decisions earlier and have confidence that the process is under control.

Protecting more than product
In food and beverage manufacturing, quality failures are not just technical events. They affect people, putting reputation at risk and undermining consumer confidence.

Filling line and seal inspection using thermal imaging closes a critical gap. It verifies fill levels and seal integrity on every unit without adding manual workload or slowing production.

Because quality assurance should not depend on chance, eyesight, or end-of-line discovery, it should be built into the process, protecting product, performance, and, most importantly, people.

Learn more about the Flir A70 Smart Sensor here.

Explore Flir's full array of manufacturing solutions in the company's cool interactive production line demo.

Source: Flir

Published May 2026

Rate this article