La cheese surface is one of the most critical points during the maturation process.

Exposed to variable conditions of humidity, temperature and air circulation, it is particularly vulnerable to the development of undesirable microflora, dehydration phenomena and the appearance of structural defects.

In this context, the food coatings have established themselves as a technological engineering tool with a direct impact on the quality, stability and industrial performance of the cheese.

Coatings are not merely “protective layers”, they are complex functional systems designed to interact in a controlled manner with the surface of the product.

Its formulation combines polymers, plasticisers, barrier agents and sometimes antimicrobial compounds or food colourings, which allows modulating the rind behaviour according to the specific needs of each type of cheese.

Structure and composition of coatings: materials designed to perform

A modern food coating must simultaneously fulfil several technical-technological functions aimed at protecting and regulating the surface behaviour of the cheese during ripening.

Filmogenic polymers

Generally, dispersions of synthetic or semi-synthetic origin with the ability to form a continuous, cohesive and stable film. These polymers must exhibit:

• Good adhesion to surfaces with varying degrees of humidity.
• Sufficient elasticity to accompany the physical changes in the cheese during ripening.
• Long-term stability under controlled temperature conditions.

Plasticisers

Plasticisers are incorporated to regulating the flexibility and mechanical strength of the film. Their presence is key to avoid cracking, surface flaking and uneven detachment of the coating, ensuring uniform and functional coverage.

Barrier systems

The engineering of the film is designed to:

• Control water vapour diffusion, minimising moisture loss and preventing excessive drying of the cheese surface.
• Regulating gas exchange (oxygen, CO₂), regulating the surface microenvironment for a more effective adequate development of the cortex.
• Provide selective permeability, This is especially important for cheeses that require limited respiration to achieve the expected ripening profile.

Functional Agents

The coating formulation can be complemented with different functional agents, selected according to the technological and commercial objectives of the product. The most common include:

• Pigments, used for to standardise and homogenise the external appearance of the cheese, facilitating visual identification and brand coherence.
• Low migration antimicrobial compounds, for the purpose of limiting the development of unwanted microflora on the surface, without significantly altering the cheese's own microbiota or its sensory characteristics.
• Anti-stick agents, incorporated for improve product behaviour during cutting and handling, reducing the adhesion of the coating to blades and equipment.

Each of these components plays a specific technical role and their correct selection and dosage has a direct impact on the final quality, stability and industrial performance of the product.

Technological role of the coating during maturation

During ripening, the cheese undergoes a series of physico-chemical transformations that determine its final quality: progressive loss of moisture, modification of texture, evolution of the microbial flora, enzymatic activity and reorganisation of the internal structure.

A properly formulated and applied coating can directly modulate each of these phenomena, acting as a key technological tool for:

Monitoring of water activity (aw) and dehydration losses

One of the most highly valued functions of the coating is the moisture stabilisation on the surface of the cheese. A properly designed and applied coating allows:

• Reduce shrinkage due to moisture loss, The cheese is usually in the range of 3-10 %, depending on the type of cheese and ripening conditions.
• Preventing premature hardening of the bark, preserving a texture in accordance with the expected profile of the product.
• Maintain uniform curvature and prevent structural collapse., This favours a more homogeneous maturation and a better commercial presentation.

Microbiological surface stabilisation

La reduction and control of mould micro colonies on the surface of the cheese requires a combination of several mechanisms:

• Continuous and seamless physical barriers, which hinder colonisation and visible mould growth.
• Localised, low-migration antimicrobial activity, enough to limit the growth of undesirable flora without significantly interfering with the cheese's own microbiota.
• Regulation of the surface microclimate (relative humidity and oxygen availability), so as to generate less favourable conditions for spoilage micro-organisms.

Together, these factors contribute to preserve the external integrity of the cheese and to avoid surface defects that may compromise their commercial acceptability.

Optimisation of the visual and sensory aspect

La uniformity of external colour and texture has become a key commercial quality criterion, especially in cheeses intended for direct sale and branded products. Coatings contribute to:

• Homogenise surface colouring, reducing batch-to-batch variations.
• Minimising visible irregularities in the crust, such as rough areas, pores or surface marks.
• Ensure a more professional and stable appearance, The new product, aligned with consumer expectations and the requirements of the distribution channel.

Improved cutting and handling

In cheeses intended for portioning and slicing operations, the coating also acts as a processing aid. A properly formulated film:

• Reduces cheese drag-out and adhesion to blades and equipment.
• Improved cutting accuracy.
• Reduce waste associated with breakage or deformation of the portions.
• Streamlines the handling process, increasing industrial efficiency and productivity.

Adapting the coating to the type of cheese: a tailor-made design

Not all cheeses require the same technological response; therefore, the formulation of the coating must be tailor-made, depending on the type of product and its behaviour during ripening and storage.

• Pressed or semi-hard cheeses, In this type of cheese, the coating is usually aimed at significantly reducing dehydration, controlling the development of moulds during prolonged storage periods and forming thicker, more elastic films.
• Soft cheeses, in this type of cheese, the coating is formulated to ensure greater gas permeability, to maintain stability against surface exudates and to offer high resistance to deformation.
• Very mature cheeses, in this type of cheese the coating is designed as a more rigid and less permeable system aimed at more strictly limiting the growth and dispersion of the microbial halo.

A high quality coating is one that does not degrade over time and remains functional from the beginning of maturation until the time of consumption.

Food coatings have evolved from simple external protective coatings to become essential techno-functional systems in professional cheese production. Its effectiveness does not depend solely on the presence of an antimicrobial ingredient, but on the complete architecture of the film and its correct integration in the production process (formulation, application, drying and maturing conditions).

Cheese dairies that incorporate optimised coatings for each type of cheese usually achieve:

• Reduction of wastage and higher economic performance global.
• A more homogeneous and professional look of the final product.
• Lower incidence of defects and rejections.
• More consistent and predictable maturities, with less variability between batches.
• Longer shelf life and microbiological stability, in both warehousing and distribution.

In an ever more demanding market, coatings are positioning themselves as an indispensable technical component to guarantee the quality of the cheese from its manufacture to its presentation to the consumer.

How DOMCA can help you optimise your cheese coatings

Within our range of products for the food industry, DOMCA we have a long track record as leading company in the development of coatings for the cheese industry, For five decades, we have been working with industries of all sizes: from small artisan cheese dairies to large production plants. Our in-depth knowledge of coating technologies, materials, preservation solutions and the technological requirements of each type of cheese enables us to provide solutions fully adapted to the specific needs of each client.

We don't believe in standard answers: we analyse every production process, every cheese format and every storage condition to design truly effective coatings. This capacity for customisation makes DOMCA a strategic partner for the cheese sector, We provide applied innovation, continuous technical support and the necessary flexibility to accompany the growth of each company.

If you have any doubts about the most suitable coating for your products or need specialised advice, you can contact our technical sales department at eliasg@domca.com.