The Comber Pressofiltro PF series Nutsche filter-dryer is a versatile unit designed for multipurpose pharmaceutical and chemical production facilities. To meet the demanding requirements for filtration-separation and drying, these units are designed to meet a wide range of stringent cGMP and FDA guidelines.
These units are built with CIP systems to achieve good cleaning and to permit optimal 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 equipped with a filter base plate that opens for access to the filter internals for cleaning and inspection purposes. The overall attention to design details allows for simplified validation of the units.
The agitator shaft sealing is accomplished with a double mechanical seal and a convoluted bellows. The agitator arms utilize a special tooth design to achieve low friction into the product when pressing or smoothing the cake layer. Simultaneous rotational and vertical agitator motions result in an efficient and even mixing of the entire product mass for mixing and drying. The agitator arms are S-shaped for improved product discharge
All product wetted surfaces are heated to obtain the largest possible heat exchange area for short drying times and a low final moisture levels.
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. For larger filters different heel break-up and heel removal devices are available.
Heinkel Group USA, Swedesboro, NJ 856-467-3399 www.heinkelusa.com
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