Chocolate production relies on clean compressed air



Compressed air plays a key role in both the processing of cocoa and the manufacturing of chocolate.

Modern cocoa processing systems use compressed air during pod splitting, fermentation, and drying applications. Compressed air is equally important in the manufacturing of chocolate in conveying, blending & mixing, moulding, and packaging. Compressed air is also used to operate robotic applications and cylinders on the chocolate wrapping machines for a faster process that delivers millions of chocolates and the candies we see lined up across store shelves.

With chocolate being a food item, the compressed air needs to be oil-free. Any impurities in the compressed air may contaminate the product, resulting in a change of color and taste, reduced shelf life, or exposure to bacteria and other micro-organisms.

Stages of Chocolate Manufacturing


1. Fermentation of cocoa beans – Fermentation is the first critical process to develop the beans’ natural flavors. The principal effect of fermentation is to eliminate or drastically reduce astringency and to develop the full cacao flavor.

2. Drying/Milling – After fermentation, the cocoa seeds must be dried before they can be scooped into sacks and shipped to chocolate manufacturers.

3. Roasting and Winnowing – After roasting, the beans are “winnowed” to remove the shells from around the bean, leaving only the roasted cocoa nib, which is the key ingredient for making chocolate.

4. Grinding – Grinding is the process by which cocoa nibs are ground into ” cocoa liquor”, which is also known as unsweetened chocolate or cocoa mass.

5. Blending – After the mixing process, the blend is further refined to bring the particle size of the added milk and sugar down to the desired fineness. The Cocoa powder or ‘mass’ is blended back with the butter and liquor in varying quantities to make different types of chocolate or couverture.

6. Conching – The penultimate process is called conching. Conching further refines the chocolate mass with continued grinding. It is at this stage in manufacturing where the maker adds more ingredients such as sugar, milk powder (only if making milk chocolate) and other ingredients and flavorings

7. Tempering and Molding – The final process in making chocolate is called tempering. Uncontrolled crystallization of cocoa butter typically results in crystals of varying size, some or all large enough to be clearly seen with the naked eye

Next time you are relishing a candy or your favourite chocolate bar or pouring chocolate syrup on your dessert, don’t forget about the clean air that helped produce your sweet treats.

See the entire process of chocolate making, all the way from plant to shop, with full explanations of every step of the process.


NPS is focused on providing the highest-quality compressors for all types of industrial operations. With efficient operation to save you in energy costs over the service life of the compressor, we are prepared to help you make the right compressor choice for your operation. Browse our product line for more information.

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