JND Technologies

Cocoa has long been one of the most versatile and useful ingredients in food products. Indeed, JND’s involvement with the ‘bean’ dates back to 1930. Today, the company’s expertise enables producers to alkalise, condition, dry, roast and cool up to 8 tonnes of cocoa nibs per hour in one continuous process line, even with moisture in excess of 30%.

The JND system incorporates the Rotary Conditioning Drum allowing sterilising, alkalising, oxidising and conditioning in one continuous processor and the Rotary Louvre Dryer/Roaster with multi-zone operation for varying process conditions. This unique flexible design enables a range of drying and roasting menus to be run.

Indirect drying and roasting of the Cocoa nibs is also possible in an Indirect Rotary Roaster which is a machine derived from the Rotary Tube Furnace described earlier. This has the advantage of reduced exhaust gas flows minimising clean up and deodorising.

Cocoa Brochure available on request

With tube diameters of up to 5 metres and lengths in excess of 35 metres, JND Rotary Cascade Dryers are often the only practical solution to high volume bulk drying of materials. These giants of the drying world can handle a wide range of particle sizes and moisture contents for a variety of products such as minerals, metal ores, fertilisers, bulk foodstuffs etc. combining a high degree of flexibility with robust design and reliability. Drying air, heated to temperatures from 80ºC to 1000ºC, flows through the dryer either co-current or countercurrent depending on the product to be dried.

The hot drying air can be generated by gas, oil or steam. Dry or wet exhaust gas cleaning can be provided as required. This principle of operation is also applied to Rotary Cascade Coolers where the hot air is replaced by ambient or chilled air.

The JND Rotary Louvre Dryer – a mechanically assisted, semi-fluidised bed system – combines a high heat transfer with a gentle drying or cooling action. Using cold air in one section allows drying and cooling to be carried out in the same unit, saving cost and space. Energy efficiency is one of the notable advantages of the JND Rotary Louvre Dryer achieved by close control over temperatures along the length of the dryer and product residence time.

Low air velocities ensure that product over-carry or dust is kept to a minimum. A range of direct or indirect heating options is available using gas, oil or steam and dry or wet exhaust gas stream cleaning systems are used according to the application.

Rotary Tube Furnaces are ideally suited for a variety of continuous thermal processes requiring indirect heating and have fully automated computer controlled operation making it a highly cost effective unit, with minimum supervision. Applications cover drying, calcination, oxidation, reduction, pyrolysis and regeneration principally for powders and granules requiring thermal treatment up to 1100ºC. Varying temperature zones can be created along the furnace length with automatic temperature control of the gas, oil or electric heating system. An integral cooling system can also be incorporated.

The JND Rotary Tube Furnace may also be supplied with gastight seals enabling inert or reacting atmospheres to be employed within the furnace tube, using low venting gas flows minimising dust losses.

Well constructed and robust, the Tube Furnace is generally delivered as a complete frame-mounted unit for ease of site installation.

For over 70 years, JND Mills have been supplied to the gypsum, cement, mining, chemical, iron and steel industries. An in-depth knowledge of these industries enables JND to design equipment to suit the material grinding characteristics, moisture and feed, to the required product size.
From the smaller installations to the very large cement clinker mills we provide the optimum solution.

Open/closed circuit operation for wet or dry milling applications.
Rod Mills for coarse grinding, fitted with trunnion, end peripheral or central peripheral discharge.

Ball Mills for fine grinding fitted with trunnion or diaphragm discharge.

Pebble Mills can be supplied where steel balls cannot be used to avoid iron contamination and discolouration of the product.

Mills can be divided into compartments with separating grates for secondary grinding in wet and dry applications.

We can completely refurbish and upgrade your existing mill. We provide a high standard of product support from routine maintenance and repair, to the replacement of shell liners, trunnion bearings and drive component and on site realignment.