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Automatic mixer feeding for optimum recipe accuracy

In the production of PVC dryblend, it is essential that all raw materials arrive at the right mixer at the right time and in the right quantity.

The vertical tower concept is a proven solution for heating-cooling mixer feeding.

Pneumatic conveying The raw materials are fed in at ground level and then conveyed pneumatically above the heating cooling mixer. This has the advantage that no big bags or other containers have to be transported up to this level and stored there. As a result, the steel structure can be designed more simply and no operating personnel are required on this level. For flammable additives, the conveying system was designed to be explosion-proof in accordance with ATEX guidelines.

Animation vacuum conveying

Dosing and weighing of colours In addition to the conveying scales for the large components, the scales for the additives and colours are located on this level. The colours are dosed into the scales in the form of microgranules via dosing screws and weighed precisely there. Each mixing line has its own colour scale, so that a line separation between light and dark colours is possible. A feeding hopper also offers the option of adding pre-weighed small quantities to the mixer.

More about dosing systems

Dosing and weighing of additives The additives are dosed from the buffer containers via double dosing screws into the scales belonging to each mixer, where they are weighed precisely. Weighing is additive: Once all the raw materials are in the correct quantities in the scales, they are emptied into the heating mixers.

8 | AZO Case Study | Finstral | Heating-cooling mixer feeding system