Industrial tray sealing machines are extensively used in the primary food packaging sector to seal pre-formed trays with various types of lidding films. These machines play a vital role in maintaining food safety and hygiene and extending the shelf life of packaged products.
A common example of tray sealing is the ready-meal industry, where sealed trays keep meals fresh, secure, and retail-ready.
Tray Types
Tray sealing machines are designed to work with pre-formed plastic trays filled and fed into the sealing system. Depending on the application, these trays can vary in material, size, and depth.
Sealing Methods
There are several sealing technologies available:
- Heat Sealing – heat and pressure bond the film or lid to the tray flange.
- Modified Atmosphere Packaging (MAP) – air is replaced with a gas mixture to preserve freshness.
- Vacuum Sealing – air is removed from the tray to create a vacuum environment, extending shelf life.
Sealing Materials
Machines can accommodate a variety of plain or printed lidding films. The choice of material depends on the product, shelf-life requirements, and necessary barrier properties such as resistance to oxygen or moisture.
Automation and Integration
Modern tray sealers are often part of larger, fully automated packaging lines. Features may include:
- Tray denesting
- Automatic product loading
- Film feeding and cutting
- Sealed tray discharge
These elements combine to provide consistent output and reduce the need for manual handling, improving both efficiency and hygiene.
Hygienic Design
Designed for high-care food environments, industrial tray sealing machines must meet stringent sanitary standards. Key design features include:
- Smooth, easy-to-clean surfaces
- Minimal crevices to reduce contamination risks
- Components built for regular washdown and disinfection
Controls and Monitoring
Advanced models feature precise digital control systems that allow full regulation of:
- Sealing temperature
- Pressure
- Dwell time
These systems often include real-time monitoring, helping operators maintain consistency and detect issues before they affect production.
Flexibility and Versatility
Tray sealing machines are available in various configurations – from bench-top models for smaller operations to fully automatic systems for high-output production. Many machines are built to handle a wide range of:
- Tray sizes and depths
- Product types
- Packaging formats
This flexibility allows for tailored solutions across different sectors within the food industry.