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The vessel lid contains an agitator with scraping plates which are powered by a gear motor with frequency converter. This makes it possible to set the optimum mixing speed to suit product properties. The PTFE scraper plates are form-fitted to the agitator without additional fastening elements and prevent overheating during the warm-up phase or crystallisation on the vessel wall during cooling. The flow breaker built into the lid ensures that the product is mixed as thoroughly as possible.

Delivery of raw materials for mixer feeding (Picture: Azo)

Achieving CIP Without Needing an Additional Pump

Spray nozzles have also been installed to allow for residue-free Cleaning in Place (CIP) without need for manual intervention. The spray nozzles are fed via the homogeniser at a pressure of 2 to 3 bar and a flow rate of over 2 m/s. This means there is no need for an additional booster pump for cleaning. If necessary, the system can be aerated through a nitrogen inlet in the cover’s ventilation pipe.

A sight glass makes it possible to observe the process. Safety devices such as limit switches and over pressure valves are also housed in the vessel lid, which can be raised by up to 800 mm via an electric-powered lifting device. This allows easy inspection of the vessel’s contents and manual feeding from the top of the vessel.

Homogenisation in Vacuum

There is a hopper for feeding liquids to the right of the process vessel. A variety of liquids, weighed precisely, can be added via this hopper, which is mounted on load cells. There is a feeding vessel for powders on the left side of the process vessel. This is where the machine operator adds the pre-weighed dry materials. The ingredients are drawn into the homogeniser from both hoppers by vacuum in the process vessel. Two further inlets are assigned to liquids, which are added to the homogeniser via automatic meters.

The homogeniser has a decisive impact on the quality of the finished product. Droplet size, colour and stability are excellent. At the same time, the shorter homogenisation times are impressive. The homogeniser, which is installed on the exterior of the vessel outlet, is controlled by a frequency converter and can thus be adjusted to provide optimum results for product characteristics when manufacturing suspensions and emulsions.

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