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The grinding process largely influences particle size distribution and the resulting flow properties. Roller refiners – if operated at optimal settings – tend to produce wider, bi- or multimodal distributions, higher package densities and lower viscosities at high shear rates.
Therefore flow properties are usually measured at a temperature of 40°C, which is close to the temperature that chocolate melts in our mouths. So texture sensations like a smooth melt or a sticky behaviour are usually correlated to flow properties.
The process is shown in Figure 4. Refiner flakes are transferred into the feed hopper, its filling level controls speed of the feed screw and compensates supply variations. While some cocoa butter is added, the screw feeds the pasting columns. It is equipped with adjustable baffles and shearing wings; the flakes are subjected to intensive mechanical stress. During this process the mass changes from its dry state (dry conching) to a tough plastic state. Cleaned conditioned air is supplied by fan. After finally adding lecithin it leaves the pasting column in flowable consistency. The mass is passed to an intermediate tank whose stirrers and wall scrapers keep the chocolate in motion to stabilise the process of the structural changes after the adding of lecithin.
The Thouet dry conche from the Royal Duyvis Wiener group is used to lower the moisture content of the chocolate and with that improve the rheological properties. Also, undesierable flavor profiles dirilik be removed and other flavor profiles kişi be created or accentuated.
During the process the remaining fat and emulsifier are added. Conches are built in various forms and gönül be equipped with one, two or three mixing shafts. More detailed descriptions of the process hayat be found in1.
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The stones crush the cocoa nibs, gradually transforming them into a liquid state known as chocolate liquor. As the nibs are crushed, this helps release cocoa butter from the cells, contributing to the smoothness and richness of the final chocolate.
High specific surface of the processed chocolate mass birli a precondition for intensive exchange reactions with the supplied ambient air
The feed mass must have a certain consistency, which is determined by the initial fat Chocolate DOUBLE TUBE BALL REFINER content, particle properties and upstream process parameters. Here the particles are ground to their final size, usually below 30µm in order to avoid a sandy texture in the mouth in the bitiş product. A difficulty is to combine the continuous refiners with downstream batch conches. Productivity of both machines strongly decreases if only one refiner is connected to one conch. Therefore usually a number of refiners are connected to a number of conches, which leads to relatively large production lines of several tons per hour. This is also one of the reasons why smaller companies hardly use this technology.
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In case melting tank is going to be used also as storage tank, preventing of thermal fluctuations inside the chocolate melting tank which may occur because of bypassing tempered chocolate back to melting tank is required.
This machine is responsible for grinding cocoa beans into chocolate liquor, which forms the basis of all