In food tray packaging, film waste often comes from trimming, sealing defects, and machine setup. Some losses result from mismatches between film specifications and tray dimensions, while others are related to feeding stability, sealing conditions, or equipment performance. Reducing waste requires identifying the main sources of loss and addressing material specifications, equipment, and process settings without compromising package seal integrity.

1. Identify the Main Sources of Film Waste

Different types of waste require different troubleshooting methods. Examining scrap patterns, defect locations, and production records can help pinpoint the underlying problems.

2. Optimize Film Specifications and Cutting Layout

Determine the Appropriate Film Width

Film width must accommodate the tray sealing area, equipment positioning, and cutting method. Excessive width can increase edge trim, while insufficient coverage may lead to incomplete sealing or cutting inaccuracies. For multi-cavity tray molds, tray spacing and the overall layout should also be considered.

When selecting tray lidding film, confirm the specifications based on tray dimensions, sealing flange requirements, equipment roll specifications, and cutting layout rather than relying on the tray's external dimensions alone.

Adjust Film Thickness Carefully

Reducing film thickness can lower material consumption per package, but it may also affect puncture resistance, feeding stability, and package integrity. After changing the thickness, test the film on the actual packaging equipment and verify its processing performance, seal quality, and protection during subsequent handling before adopting the new specification.

3. Troubleshoot Sealing Defects to Reduce Rework

Confirm Compatibility Between the Film and Tray

The film's sealing layer must be compatible with the tray surface being sealed. Distortion, oil, moisture, or food residue on the tray flange can also result in incomplete or inconsistent seals. Troubleshooting should therefore consider the film, tray, and sealing area together rather than automatically attributing the problem to film quality.

Check Equipment Settings and Seal Conditions

Sealing temperature, pressure, and dwell time should be evaluated in relation to the material and equipment. Make adjustments one at a time within the ranges recommended by the material and equipment suppliers, and record how each change affects seal quality. Raising the temperature without identifying the cause may deform the film or damage the tray without improving the seal.

If defects occur mainly at tray corners or in specific mold cavities, inspect the sealing tool for cleanliness and flatness, and check whether pressure is distributed evenly.

4. Measure Waste and Verify Improvements

Record film input, trimming scrap, setup scrap, rejected packages, and rework by product specification, machine, and material batch. These records help identify where the largest losses occur.

The material scrap rate can be calculated as follows:

This metric measures the proportion of input film discarded as scrap; it does not fully represent the total economic impact of production losses. Rework, rejected packages, and associated handling costs should be recorded separately to avoid double counting. Use consistent measurement methods before and after process changes, and verify the results under actual production conditions while confirming that package seals continue to meet requirements.

Reducing tray lidding film waste requires coordinated evaluation of material specifications, tray design, equipment performance, and sealing conditions. Selecting suitable Tray Lidding Film and validating its compatibility with the tray and packaging equipment through production trials can help reduce unnecessary scrap and rework while maintaining consistent packaging quality and production efficiency.