The company shows how inspection tech keeps ready meals safe, compliant and tasty.
Written by Miriam Krechlok from Mettler Toledo
Ready meals today offer more than just convenience. From dehydrated noodles to sauced pasta dishes, such dishes have become a sophisticated product category. However, each type of ready meal poses unique production challenges.
The importance of inspection technologies
Inspection technologies, such as metal detection, x-ray inspection, vision inspection and checkweighing are crucial for maintaining the integrity and safety of ready meals. These technologies help detect physical contaminants, achieve proper labelling and confirm consistent portion sizes.
Challenges in dry ready meal production
Dry ready meals, such as instant noodles, dehydrated soups and rice mixes, present specific challenges. One of the primary issues is the generation of dust and fine particles during production. These particles can interfere with inspection systems and obscure contaminants, making detection difficult. Once the ingredients are fried and dried, maintaining hygiene becomes critical, and confirming packaging integrity is essential to prevent moisture from compromising product freshness.
Example in action: Instant noodles
Take the production of instant noodles as an example. This popular meal involves several key steps, each presenting its own challenges:
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Raw material inspection: The process begins with inspecting incoming raw materials, such as flour and oil. Advanced metal detection systems are employed early in the process to screen these ingredients for ferrous and non-ferrous metals and stainless steel, capturing contaminants before they can enter the production line.
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Mitigating explosion risk: Inspection of dusty, powdered products such as flour carries a potential explosion risk. If using a metal detection system at this stage, it is important to select one with a suitable design that complies with explosion prevention regulations such as ATEX / IECeX.
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Advanced detection technology: To combat product issues, advanced metal detection technologies, such as Multi-Simultaneous Frequency systems, are often employed. These systems use multiple detection frequencies simultaneously, allowing the equipment to distinguish between the product and actual contaminants.
The frying and drying stages of making dry noodles will introduce additional contamination risks from oil and fine particles. Oil can trap contaminants or coat foreign objects, complicating detection. Fine particles can obscure contaminants, particularly in dusty environments. To address these risks, metal detection systems are employed post-frying to identify any remaining foreign bodies. Checkweighers are also utilised to confirm that portion sizes remain consistent, further supporting product quality and reducing waste.
Packaging and final inspection
During the packaging stage, x-ray technology is crucial for scanning for contaminants such as glass or plastic that may have entered the process. Agglomerates can also pose a challenge, especially in dried products where flavouring or seasoning can clump together. Advanced x-ray technology is required to differentiate between harmless clumps of ingredients and actual contaminants.
Wet Ready Meals: Tackling contamination and packaging integrity
Wet ready meals, which include soups, stews, sauced pasta dishes and curries, also present unique challenges owing to the differently constituted elements: a high liquid content and dense ingredients. These meals are often highly processed and this further increases the risk of contamination.
Example in action: Soup production
In the production of soups, the process begins with inspecting raw ingredients such as vegetables, meats, grains and other ingredients. Since soups are considered a pumped food, they contain chunks of other foods that are essential and cannot be sieved out. Metal detection and x-ray systems are employed to screen for foreign bodies in these ingredients before they are mixed and processed.
Filling process and packaging integrity
During the filling stage advanced inspection technologies like x-ray systems come into play. These systems are highly effective at detecting contaminants through complex packaging materials.
Weight control systems are also critical during this stage, as they verify that each container has the correct quantity of food. Imbalance in portions could lead to inconsistent product quality and non-compliance with weights and measures legislation, making checkweighers essential.
The integrity of packaging is also important for wet products, as any leakage can lead to spoilage or bacterial growth. X-ray systems help identify weak spots in the packaging that may result in leaks.
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