Filter-dryer suitable for pharma

Heinkel's Comber Pressofiltro PF series Nutsche filter-dryer.
Heinkel's Comber Pressofiltro PF series Nutsche filter-dryer.

 It can be used for the filtration-separation and drying used in these applications.

Heinkel's units are designed to meet a wide range of stringent cGMP and FDA guidelines and are built with CIP systems to achieve good cleaning and to permit inspection after the cleaning process. All product contact wetted surfaces are designed without dead areas, with smooth transitions of internals and without any bolted connections. The filters are also equipped with an opening filter base.

The agitator is supported from the top, with the agitator drive, the bearings and the shaft seal are installed externally. Shaft sealing is with a double mechanical seal and a convoluted bellows. The agitator arms smooth and press the cake when rotated counterclockwise, and mix and agitate the cake when rotated clockwise. This simultaneous rotational and vertical agitator motions result in a more efficient and even mixing of the entire product mass for mixing and drying. The agitator arms are S- shaped for improved product discharge.

Heat exchange

All product wetted surfaces are heated to obtain the largest possible heat exchange area for short drying times and a low attainable final moisture levels. Supplemental microwave heating is available to further reduce drying times.

The product is discharged through a hydraulically operated side discharge valve, with the valve plug contoured to match the curvature of the vessel internal wall. The solids discharge valve is a metal to metal seal design with the sealing surfaces arranged outside the product flow path, with interchangeable seal rings. Alternatively, the product can be discharged through an active or passive isolator (glove box). On smaller filter units the isolator permits contained sampling, product discharge and heel removal all in one system while for larger filters, different heel break-up and heel removal devices are available.