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Heat Sensitive Milling Milling the Gentle Way - A Sieve Mill for Heat Sensitive Products

| Editor: Dominik Stephan

New, yes, but based on tried and tested principles yet with improved ergonomics — that was the thinking of the designers at size reduction specialist Frewitt as they developed the OscilloWitt, their latest technology for the gentle milling of heat-sensitive products.

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The large front door simplifies CIP (with removal of the rotor and sieve), WIP, and manual cleaning. (Picture: Frewitt)
The large front door simplifies CIP (with removal of the rotor and sieve), WIP, and manual cleaning. (Picture: Frewitt)

The very name OscilloWitt reveals the defining characteristic of the new sieve mill: its oscillating rotor. This core component was borrowed from Frewitt’s previous model, the MF line of mills, and brings the same proven advantages. The oscillating rotor means less heat build-up to damage sensitive materials, and a milled product with more uniform grain size and minimal fines.

Although the OscilloWitt operates on the same principle as the previous model, it brings several new features to improve versatility, ease of use and product quality. The acceleration of the oscillating rotor can now be controlled over a variable angle. Setting of the distance between the rotor and the sieve has been simplified. Stepwise adjustment of the oscillation amplitude compensates for normal rotor wear, so less-frequent maintenance is needed.

Both the OscilloWitt-3 and the OscilloWitt-6 can also use rotary as well as oscillating rotor motion, changing from one operating mode to the other at the flick of a switch. This makes the equipment more flexible, and lowers investment costs in plants requiring both types of mechanism.

Oscillating Rotor Sieve Mills for Sensitive Products

More detailed design changes include a round inlet funnel with a Tri-Clamp connection, which makes it considerably easier to integrate the OscilloWitt into an existing system. The discharge funnel is seamlessly integrated into the housing. There are no crevices within the milling chamber, no grooves in the shafts, and all seals are designed and fitted to avoid product accumulation.

In fact, the tight seals allow the processing of products that require higher containment levels or a built-in WIP or SIP system. The large front door simplifies CIP (with removal of the rotor and sieve), WIP, and manual cleaning.

The new six-arm rotor design, in combination with stepwise adjustment of the oscillation amplitude, means that wear on the rotor arms is so minor that the OscilloWitt rotor requires hardly any maintenance.

A protective grate and a safety interlock for the inlet funnel ensure a high level of safety. The discharge plate can be removed without having to dismantle the inlet funnel. Lightweight components are used to reduce the weight of the mill, but without sacrificing the sturdiness which characterizes Frewitt equipment.

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