Thanks to their manufacturing technology and mechanics, they are widely used when, due to the nature of the products, vibratory movements would cause operational problems. EFJ tumbling screens are typically used to sieve extremely fine and/or lightweight products (food flour, micronised materials, mineral powders, plastic powders).GKM Vibrating Tumbler Screener | dry and wet screening ...Painted, brushed, polished, and ViwateQ options, for food and pharmaceutical products with a surface roughness of < 0.4 microns (GMP and FDA compliant). +44 (0)1625 412000. [email protected] . Functionality. The GKM Vibrating Tumbler Screener uses vibration technology to create precise 3D elliptical movement.