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Asymmetrical drum funnels for controlled filling and emptying of drums and similar containers. Asymmetric funnels are used primarily in the chemical, pharmaceutical, and food industries and are designed for applications with high requirements for material resistance, hygiene, and process reliability. Manufactured from austenitic stainless steel 1.4404 (AISI 316L). This material offers high corrosion resistance to aggressive media as well as good mechanical properties and is suitable for contact with sensitive products. The asymmetrical design supports targeted material flow and facilitates largely complete emptying, thereby reducing product residues and losses. To improve cleanability, the inner surfaces are treated using the Optimized Grind Finishing (OGF) process. The resulting surface roughness of Ra < 0.25 µm reduces particle adhesion and supports hygienic cleaning processes. In addition, the drum funnels are electropolished to further increase surface smoothness and corrosion resistance. The design of drum funnels complies with GMP guidelines

Recommendations for proper flow from rectangular or pyramid shaped hoppers, in view of the corners of the hopper that are less steep. Rectangular hoppers are widely used to store bulk solids. Although convenient to fabricate they have process drawbacks in that large flat sides are prone to deflection, so often require stiffening, and the converging faces form gully angles that offer poor flow and self-clearing properties. Some small compensation is given by the rectangular outlets being somewhat easier to fit with slide valves. ​​ Gully angle The gully angle of a symmetrical, pyramid shaped hopper is roughly 10 degrees less steep than sides and is prone to retention of product unless it is radiused. Flow pattern For mass flow design purposes, the inclination of the gullies should be considered as a cone. For funnel flow hoppers the gully angle should exceed the wall friction angle by at least 10 degrees. Some product retention in the corners is almost inevitable unless the corner is radiused or significantly increased in inclination. Mass flow in two steps Mass flow is much more practical