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Posts Tagged ‘agitator’

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Metering Screw Feeder

Metering screw feeders are used to accurately meter powdered, granular or flaky products in a process system.

Fresco offer both Volumetric (product flow rate by volume and set over a given time) and Gravimetric (product flow rate by weight and controlled using loadcells) types of metering screw feeders, with throughputs ranging from 1.76 l/ hr up to 13650 l/hr. Where very fluid powders are handled Fresco installs a pneumatically actuated flow control valve on the discharge of the screw tube to prevent flushing.

The crucial factor in achieving accuracy is consistent product bulk density by proper design and selection of an agitator in the conditioning zone above the screw auger. The agitator de-aerates and densifies the product to a uniform density and breaks any bridges, preventing hold-up in the hopper. This combination with a vast selection of screw sizes and types allows a wide cross-section of products to be fed very accurately.

Volumetric accuracy of ± 1% to ±2% and gravimetric accuracy of ±0.25% to ±1%, depending on the product, can be easily achieved. Weigh platforms fitted under the standard feeder linked to a batch controller provide accurate loss-in-weight feeding. Two-way RS 232 serial ports can be used to send and receive signals from other plant control systems. An easily removable front section provides access for cleaning and screw changes.

Fresco provides multiple weigh batching solutions, gain-in-weight and loss-in-weight systems that can be easily integrated with your equipment. Working with our electrical control and automation engineers we can provide high accuracy batching solutions that will ensure reliability and precision whatever your requirements.

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Ribbon Blenders are the most commonly used blenders.

The products to be mixed constantly circulate from end to end, making the Ribbon Blender particularly good for blending minor additives in the mix.

The agitator consists of an outer ribbon which moves the product from the ends to the centre while the inner ribbon moves the product away from the centre. The agitator design lends itself to mixing low-density free flowing products with a high degree of efficiency and accuracy. 

Fresco Ribbon Blenders are available in single, double or triple ribbons with either central or end discharge. The close tolerance of the ribbon to the body ensures nearly 100% product discharge.

Ribbon Blenders are also available in both direct drive and chain and sprocket drive depending on the application. 

All blenders should be connected to a dust collection system to prevent dust escaping into the environment. Various tip hatches and grills can be supplied to suit specific plant or product requirements. All Fresco Ribbon Blenders are supplied standard with a Dust Collection spigot. Access for cleaning and maintenance is gained through a fully opening hinged access lid, supported by gas stays and secure clamps. A smaller access hatch, complete with a hinged lid, gas stay and safety grill allow the operator to load manually while the blender is operating. CIP sanitisation and wash down units are also available.

Read About Blending Systems

Fresco recently responded to a customer’s requirements by providing a full turn-key blending system with ingredient traceability.

The scope was to provide a food grade blending facility capable of blending and tracking various ingredients including sugar, milk powder, flour, flavors and colorings to a better than 99% homogeneity at a rate of 6,000kg/hr. The system also required two blending lines to be run simultaneously.

Additional restraints also include the raw materials coming in various packaging types including bulk bags, 50kg sacks and 25kg bags.

After consultation with the customer, Fresco Systems offered a solution that meet all of the current requirements and allowed for future increases in plant capacity and the option to receive materials in bulk tanker delivery.

The solution consisted of a CITEC recipe based electrical automation system where the recipe for each blender is entered by the production manager for the day. Operators follow the schedule by manually weighing macro ingredients and tip these into the bag dump station following the prompts on the HMI operator interface panel. As each ingredient is entered the operator acknowledges it on the screen.

Minor ingredients are then tipped into the bag dump to flush the macros through the system. The bag dump stations are fitted with integral dust collectors so that any collected dust is returned to the product stream avoiding waste and cross contamination. All ingredients tipped through the bag dump station are passed over a vibratory separator sifter to ensure the ingredients are free of lumps or foreign objects. Major ingredients are received in 1000kg and 1200kg bulk bags which pass through an inline rotary sifter while conveyed on a gain-n-weigh basis to the receival hopper. A common dense phase vacuum system then conveys the ingredients to either of the two mixer receival hoppers. To allow for continuous operation, the macros, minors and major products are assembled in the receival hopper while the previous batch is being blended in the ribbon blender below.

As each ingredient is weighed, the actual weight is logged in the SCADA system for track and trace purposes as well as recording production details. Loadcells on the receival hopper also provide confirmation that the weighed product is completely discharged to the blenders. A magnet is also installed prior to the blenders to ensure that all metal contaminants are captured.

Flavours and colorings which would otherwise contaminate the vacuum conveying system are tipped directly to the blenders via a mini bag dump station. This removes the need to clean the system between recipe changes increasing process capacity. The mini bag dump stations are fitted with vibratory security screens and dust collection systems. The dust collection system also doubles as the balance for the displaced air as ingredients are discharged for the receival hopper in to the blenders.

The blenders are fitted with variable frequency drives ensuring that the product is handled with care reducing the risk of degradation during the mixing cycle. Once the blend time is reached the batch is discharged into bulk bags for storage and transferring to the various packing lines.

Fresco Systems tailors their standard range of bulk materials handling systems to suit each customer’s unique needs providing a tailored solution suitable to the operation and budget of each customer. As Fresco Systems designs, manufactures, installs and commissions their own systems, they are in complete control of the entire process offering customers cost competitive solutions of the highest quality.

Read More About Ribbon Blenders

The Fresco blender’s double ribbon configuration moves products through, constantly circulating them from end to end, making it particularly good for blending minor additives in a mix.

The agitator consists of an outer ribbon that moves the product from the ends to the center while the inner ribbon moves the product from the center to the ends.

The agitator design lends itself to mixing low-density free flowing products with a high degree of efficiency and accuracy. Various, standard sizes are available to suit the batch size and bulk density of the material being mixed. Shaft mounted and chain drive geared motors are available as required. The range of ribbon configurations include paddle, single, double or triple ribbons with either end or central discharge.

When filling the blender the operator can tip 25kg bags of various powders through the minors loading hatch or they can load via various lid configurations from bulk bags, mechanical conveyors or pneumatic conveyors. Loss in weight or gain in weight from bulk bags or pneumatic hoppers is also common methodology for major ingredients. The lid is fitted with safety switches and is hinged supported by gas stays providing the operator with full and easy access for cleaning between batches. Fresco blender can be fitted with a flush fit valve on the discharge feeding directly into a dust tight bulk bag fill head or a conveyor to processes downstream. Rotary sifters and magnets can also be incorporated into the system.

Fresco’s standard range of ribbon blender sizes range from 150 litres up to 4,000 litres and can be constructed in mild steel, 304 or 316 stainless steel with finishes ranging from industrial to pharmaceutical. With standard features such as integral mounting feet, air purge lip seals, double ribbon and easy access, the Fresco ribbon blender can also be tailored to meet a specific requirement.

For more information and to discuss potential systems, please contact or visit our contact page to find our nearest office.

Case Study:

Cone Blender
June 27, 2014/0 Comments
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Crumb Handling System

When a food manufacturing firm in Sydney had a requirement to feed bulk crumbs mixed with oils out of pallecons and into a process line, they knew they had a challenge on their hands.

The product compacts under its own weight causing it to bridge and rat hole, making it hard to deliver into conveyors.

Fresco Systems was able to prove through a series of product trials they had ability to work with the product. Fresco then designed and quoted a system that would allow the client to reduce the physical handling of the product while maintaining a continuous throughput, thus both reducing costs and improving productivity. The system provided is completely unmanned except for the loading and unloading of the bulk materials.

Fresco Systems design philosophy makes it a natural choice for this type of application – where ergonomics, safety and productivity go hand in hand. For this application it was imperative that all contact materials were manufactured to the highest standard from 316 S/S and incorporating full safety guarding and interlocks to a category 3 level.

The custom designed solution incorporates a hydraulic bin tipper, with a graduated tipping angle to allow an even flow of product through a mesh into the charging hopper. The hopper was specifically designed with an agitator and fluidisers to negate any chance of bridging or flow issues. This then feeds a charging adaptor for the flexible conveyor, which is tuned via a VSD to match the downstream flow requirements.

This complete system had to fit within tight space requirements meeting site specific protocols around operator access to controls and forklift loading of bulk materials.

Fresco systems is the obvious choice when the requirements are for anything that requires thinking outside of the square, with a team of specialist engineers they are able to customise the solutions to cost effectively meet or exceed the clients expectations.