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.

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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 RC and DRC are genuine ‘dry’ conches – they are filled with dry chocolate flake and will keep the product ‘dry’ through out the conching process until the very end when the cocoa butter and lecithin is added.

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McCarter tanks, mixers, melters and other chocolate making equipment continue to earn a high quality reputation within the industry due to Schmidt’s production skill and quality control.

The Refiner has 2 product outlets – the lower part by screw conveyor and the upper part by pump (recirculation system). The machine is available in 3 models, which will allow all types of manufacturers to use the machine for different purposes.

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Schmidt continues to operate with a core focus on producing high quality products and solutions for customers within the schedule required.

Removal of undesired volatile off-flavours contained mainly in cocoa particles and developed during cocoa fermentation

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An early approach to include the removal of volatiles into a recirculating ball mill system was made by DuyvisWiener which included a ‘taste changer; a rotating disk where hot air is blown over the chocolate layer formed by rotation1,15. These devices are still sold for small scale applications. F.B.Lehmann, now part of DuyvisWiener, saf a long experience in building thin film evaporators and horizontal ball mills for cocoa processing and had also offered systems for chocolate mass production.

●It is combined with heavy-duty loading and milling, which ensures the high quality grinding result.

Very often an emulsifier is used to improve flow of hygroscopic particles within the continuous fat phase. During production several incidents occur: