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Additives and colours

Colours and additives, such as stabilizers or modifiers, are fed into the process at separate low-dust feeding stations.

Small quantities - big impact

Although additives are only small components in dryblend production, they are very important for the properties of the end product. Stabilizers, modifiers and titanium dioxide, for example, are delivered in big bags and emptied into buffer containers via discharge stations. Each buffer container has a vibrating bottom to support discharge and a dosing screw that enables precise dosing into the hopper scale. Weighing is achieved by gain in weight: only when all the raw materials are in the correct quantity in the scales, they are conveyed to the heating mixers by means of vacuum conveying.

« The handling of large components, such as our PVC powder, is relatively simple. Thanks to AZO‘s proven vacuum weighing technology, we have quickly achieved the right balance between throughput and dosing accuracy. When it comes to additives and colours, however, i.e. small quantities, AZO demonstrates its full expertise and has not only implemented line separation, but also maximum product and

operator protection. » Matthias Fauster, Finstral AG

Constructive explosion protection Additives are often combustible dusts.

The use of rapid-closing valves, pressure-shock resistant receivers and flanged pipelines is essential for operator and system safety.

6 | AZO Case Study | Finstral | Heating-cooling mixer feeding