Delta Costruzioni Meccaniche Srl

Delta Costruzioni Meccaniche has manufactured Drum Flakers for over forty years always improving their performances. Indeed the former model has been equipped with new devices and details like internal cooling by sprayers and the new drum design.

Drum flakers are suitable for handling of many organic and inorganic products. Years of use, also in hard conditions, have shown their high reliability.

Principles:

Flakes are obtained through a process that allows the product solidify by means of internal cooled drum:

• A thin layer of liquid product adheres to the outside of the rotating drum and solidifies between the feed and the knife.

• When the hardened layer arrives to knife it is detached from drum and broken in small flakes that fall into discharge device.

Thickness of flakes depends on feed type, drum rotation speed and, in the DRVF bottom vat type, it depends also on the immersion of the drum.

All these parameters are easily adjustable to optimize production time.

Working is continuous and after the initial setting, according to the kind of product and the required volume, any other setting or modification is necessary.

Delta is able to supply two different models of DRF according to your needs:

• DRFV Single Drum Flaker with vat

• DRFT Flakers with distribution roll 

DRFV – Single Drum Flaker with Vat

Suitable for warm liquid products whose state changes with a cooling action.

DRFV  is equipped with the following devices:

• Rotating cylindrical drum internally cooled by means of a sprayer system.

• Heated vat for melted products containing.

• Special adjustable overflow to control level in the vat.

• Knife for product detaching from the drum. Material of construction depends on the hardness of the product.

• Drive unit for drum rotation. Variable rotation speed.

• Discharge hopper for flakers collection.

 DRFT – Flakers with Distribution Roll

Suitable for pasty products (for exemple those produced by Thin Film Dryers)

• In DRFT the Vat is replaced by a distribution roll on the upper part of main drum.

• The roll has a separate drive unit and the distance from main drum is easily regulated.

• An additional knife for cleaning the distribution roll is foreseen.

For the DRFT it’s possible to have a hydraulic system for the roll which can act also like a safe device to avoid any machine damage in case of falling metallic parts.

Further ther’s the possibility to heat or cool the distribution roll

DVRF Vacuum Dryer is a horizontal cylindrical machine with an internal agitator, manufactured to meet the highest standards of quality and safety.

The main feature of DVRF is the very high effectiveness of its drying process, far better than other vacuum dryers.

The DVRF allows you to:

Efficiently dry obtaining successful results due to the wider heat exchange surface and to the agitator special shape, indeed the bigger diameter of the shaft and of the blades arm increases the heated area. 

Move the cake during drying phase at a variable speed.

Automatically discharge the product through a specific valve installed on the main door that also facilitates machine cleaning and inspection.

The agitator is designed to optimize the heat exchange and the mixing function efficiency. Moreover the blades’ shape enables the automatic discharge of the final product.

Each part of the DVRF has been conceived to minimize the heel.

The DVRF is equipped with a sintered wired mesh cartridge filter on the vacuum line. This particular tool allows an optimal powder capture thus avoiding product contamination

DNFD Nutsche Filter Dryers are versatile, multipurpose machines wherein the following operations can be performed:

Filtration. It’s due to a process driven by pressure difference ∆P between the two sides of the filtering sheet. Special agitator smoothing movement allows to maintain ∆P also when the cake has already a low liquid percentage. In this way the filtration process reaches a dryness higher than other standard filters, indeed the final squeezed cake is comparable to that obtained by centrifuges.

Washing. Through several cycles of re-slurry and filtration, the machine allows you to wash the product with a suitable solvent and in a more effective way. This process is led by a clockwise agitator movement.

Vacuum drying. After the end of the last filtration the product can be vacuum-dried by means of both bottom and side vessel heating while the chamber is under vacuum. During this step the agitator rotates in counter-clockwise direction.

In some cases it’s also possible to blow the product with an inert suitable dry hot gas that can be fed through the bottom of the machine.

Automatic discharge of dried product. Once the product has reached the required dryness level, it is automatically discharged through the side discharge valve.

Because multipurpose machines, Nutsche Filter Dryers greatly improve the product purity and minimize safety and environment problem of manual transport of chemical ingredients.

Application Fields. DNFD is suitable for multi-product or mono-product application accomplished in batch process, such as:

•   Antibiotics

•   Pharmaceutical intermediates

•   Fine chemicals

•   Dye stuff

•   Chemical Intermediates

•   Food industry

•   Inorganic salt

•   All fields  where the crystals of suspension are the product to be recovered.

Executions:

•   Industrial

•   Pharmaceutical, for final oral dosage form pharmaceuticals

•   Sterile, for final injectable dosage form pharmaceuticals

Benefits:

•   High purity of product

•   Cleanability

•   Optimization of filtration and drying process

•   Easy operation

•   Low investment & maintenance cost

•   Utilities

•   Test

•   Research & development