Machines for Vacuum-Sealing Packing

Table of Contents

General Information
The Optimal Solution
Why Exergen IR Non-Contact Sensors?
Commercial Advantages

General Information

People like their food to be as fresh as possible. The shelf life of food products can be extended by vacuum-sealing packaging, which prevents their exposure to the natural atmosphere and thus slows down their microbial deterioration. In addition, the vacuum fixes the product within the pack which provides a degree of protection and reduces the packaging volume.

To ensure effective vacuum-sealing packaging, the seal should be fully closed. If air enters into the packaging, the product cannot be sold because its quality cannot be guaranteed. However, such issues and/or delays in production can be prevented with a reliable vacuum-sealing packaging solution.

Following the vacuum process, the sealing of the plastic bag is created using a hot resistance wire that joins both sides of the vacuumed plastic bag together. The ambient temperature of the machine and the temperature of the plastic can differ throughout the day. This variable temperature can result in failed seals in the early morning when the melting wire is likely to be cold. If this situation is prevented by increasing the heat, the temperature later in the day may become too high, which may eventually burn the plastic.

The Optimal Solution

By measuring the seal temperature and creating a feedback loop to the resistance wire, manufacturers can have much greater control over the sealing process and accordingly adjust it to meet the ambient conditions. Contact thermal sensors do not provide a practical option for use with vacuum-sealing packaging applications due to a number of reasons. Firstly, when a contact sensor touches a melting plastic it will be damaged, and secondly it is too slow to react in time to establish when the ideal fusing temperature of the plastic has been reached.

The Exergen Micro IRt/c non-contact sensor provides a perfect solution for the job; the non-contact sensor does not need to touch the plastic. Additionally its very small form factor, fast (50 ms) response time and repeatable accuracy of 0.01 °C (0.02 °F) makes it an established solution for this challenge.

Exergen IR Non-Contact Sensors

Why Exergen IR Non-Contact Sensors?

  • No contact with sealed, hot plastic
  • Fast reading; 50 ms response time
  • The sensors need neither programming nor calibration, so are easy to use
  • Accurate with repeatability of 0.01 °C (0.02 °F)
  • The small size ensures that the sensors can be fitted in the limited available space; the 6.3 mm (0.25") tube can be easily fitted in the bar of the vacuum processing machine

Commercial Advantages

  • Reliable and fully automated solution
  • Always a quality seal, thanks to a controlled constant temperature
  • No scrap – no loss of production time
  • A high ROI


Exergen Global

This information has been sourced, reviewed and adapted from materials provided by Exergen Global.

For more information on this source, please visit Exergen Global.

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