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Packaging Materials for Dried Milk Products

By PMG Engineering · 30 Nov 2023

Introduction: The Role of Packaging in Food Safety and Shelf Life

In the food processing and manufacturing industries, packaging is far more than a wrapper—it is a critical barrier against spoilage, contamination, and product degradation. With increasing demand for longer shelf life, convenience, and sustainability, the importance of innovative food packaging solutions has skyrocketed.

In the case of dried dairy products, packaging ensures food quality during transport, storage, and consumption, protecting against environmental hazards like moisture, light, oxygen, and microbial exposure. Modern developments like vacuum packaging, nitrogen flushing, bio-based films, and active packaging now form an essential part of any food manufacturing consultant’s toolbox.

Packaging Challenges in Dried Milk Products

Understanding the Unique Properties of Dried Dairy

Dried milk products—such as skim milk powder (SMP), whole milk powder (WMP), buttermilk powder (BMP), and milk protein concentrates—present several packaging challenges due to their:

Hygroscopic nature (prone to moisture absorption)
Porosity and light sensitivity
Susceptibility to fat oxidation and odour absorption

For food processors and engineering consultants for the food industry, selecting optimal packaging materials is critical to preserving taste, nutrition, and shelf life.

Milk Powder Packaging Line

Key Properties Impacting Packaging Design

🔹 1. Hygroscopicity

Dried milk products easily absorb moisture, especially in tropical regions. Hence, moisture barrier packaging is essential.

🔹 2. Cohesivity

Smaller particle size and surface fat in powders like WMP increase cohesion, affecting high-speed packaging operations.

🔹 3. Oxygen Sensitivity

Oxidation of lipids results in rancid flavours. Vacuum sealing or nitrogen flushing is vital to ensure long-term stability.

🔹 4. Light Sensitivity

Prolonged exposure to light leads to surface bleaching and fat oxidation. Light-resistant packaging materials are a must.

🔹 5. Heat Sensitivity

High temperatures degrade flavour and solubility. Thermal-insulated packaging solutions help maintain quality.

🔹 6. Bulk Density

Impacts packaging size and free-flowing properties—a crucial factor in determining packaging material types.

🔹 7. Odour Sensitivity

Odour contamination can occur through interaction with packaging materials like kraft paper or plastic films.

🔹 8. Static Electricity

Especially problematic in plastic packaging—requires antistatic agents in material design.

🔹 9. Microbial Stability

Although dried products are less prone to microbial contamination, airtight sealing remains important.

Packaging Requirements for Dried Milk Products

To meet quality standards, packaging must be:

Mechanically strong for handling and storage
Moisture and light resistant
Suitable for vacuum/N₂ flushing
Stackable, space-efficient, and safe
Clearly labelled with instructions
Designed for cost-efficiency and sustainability

These are essential factors any food processing consultant or packaging technologist must account for during project execution.

Types of Packaging Materials for Dried Milk Products

Functional requirements of packaging materials

1. Metal Cans

Made from tinplate with excellent barrier properties against light, moisture, and gases
High stacking strength and durable for long-term storage
Ideal for premium dairy packaging, though costlier in production

Metal Cans

2. Flexible Packaging

Includes plastic film, aluminium foil, and paper laminates
Retort pouches provide heat resistance and moisture control
Popular for cost-effective, high-speed packaging lines

Flexible Packaging

3. Bag-in-Box Systems

Combines an inner protective bag with an outer carton for mechanical strength
Offers a balance of barrier properties and transportation safety
Widely used in bulk dairy powder packaging

Bag-in-box packaging

Conclusion: Packaging as a Strategic Asset in Dairy Processing

In the realm of food technology consulting and food business consultancy, effective packaging is a strategic advantage. It ensures safety, extends product life, and supports brand integrity. Especially in dairy, where freshness and quality are paramount, investing in the right packaging materials and systems is non-negotiable.

For manufacturers and entrepreneurs seeking guidance, experienced food manufacturing consultants and food factory design experts play a pivotal role in selecting, testing, and validating packaging solutions tailored to product and market needs.

Frequently asked

Why do dried milk powders need such specialised packaging compared with other dry foods?

Dried milk products such as skim milk powder (SMP), whole milk powder (WMP), buttermilk powder (BMP) and milk protein concentrates are hygroscopic, porous, light sensitive, and susceptible to fat oxidation and odour absorption. Packaging must therefore act as a barrier against moisture, light, oxygen and microbial exposure throughout transport, storage and consumption, protecting taste, nutrition and shelf life rather than simply wrapping the powder.

Which powder properties should we evaluate before finalising packaging material and machine selection?

For dried milk products, nine properties drive packaging design: hygroscopicity, cohesivity, oxygen sensitivity, light sensitivity, heat sensitivity, bulk density, odour sensitivity, static electricity behaviour and microbial stability. Cohesivity from small particle size and surface fat in WMP affects high-speed packaging operations, while bulk density determines pack size and free-flowing behaviour. Each must be assessed against the intended material and line speed.

How do we prevent rancid flavours in whole milk powder during storage?

Rancid flavours in dried milk products come from oxidation of lipids, so vacuum sealing or nitrogen flushing is vital for long-term stability. Light exposure also drives surface bleaching and fat oxidation, so light-resistant packaging materials are a must, and high temperatures degrade flavour and solubility, which thermal-insulated packaging solutions help control. Packaging chosen must be suitable for vacuum or N2 flushing.

When are metal cans worth the extra cost for milk powder packaging?

Metal cans made from tinplate offer excellent barrier properties against light, moisture and gases, plus high stacking strength and durability for long-term storage of dried milk products. They are ideal for premium dairy packaging, but production cost is higher than alternatives. The decision is a trade-off between required barrier and shelf life performance and the cost-efficiency targets of the product and market.

What packaging format suits bulk dairy powder shipments?

Bag-in-box systems are widely used for bulk dairy powder packaging. They combine an inner protective bag with an outer carton that supplies mechanical strength, giving a balance of barrier properties and transportation safety. Flexible packaging using plastic film, aluminium foil and paper laminates is the other common route, favoured for cost-effective, high-speed packaging lines, with retort pouches adding heat resistance and moisture control.

What does packaging have to deliver for a dried milk product to meet quality standards?

Packaging for dried milk products must be mechanically strong for handling and storage, moisture and light resistant, suitable for vacuum or nitrogen flushing, stackable, space-efficient and safe, clearly labelled with instructions, and designed for cost-efficiency and sustainability. Although dried products are less prone to microbial contamination, airtight sealing remains important. These factors must be accounted for during project execution, not after.

CITE THIS

PMG Engineering. (2023). Packaging Materials for Dried Milk Products. PMG Engineering. https://pmg.engineering/Article/297/packaging-materials-for-dried-milk-products/

https://pmg.engineering/Article/297/packaging-materials-for-dried-milk-products/