Plaston Ag

Plaston Ag, Kunststoffwerke Hans Frei & Sohne

Roland Frei

Franz Gutmann

Peter Sieber

Peter Koeppel

An air cleaning apparatus comprises a housing that includes four housing parts and a motor unit with an axial fan arranged in the middle zone of the apparatus. The motor unit forms with upper and lower housing parts a single unit. The air is sucked by the motor through a circular air channel. The outer zone of the air channel is surrounded by a multi-layer filter mat in the form of a shell. Along the side surface of the apparatus, air inlet openings are arranged. In the central zone on the upper surface of the cover air outlet openings are provided.

Air cleaning apparatus

A filter for liquids and particularly coffee comprises a container having a planar horizontal base formed with at least one filtrate drainage opening, and on its inner face formed with a plurality of radial ribs and a central support member which together support a generally planar filter element of thin sheet material in spaced parallel relationship to the base. In use the arrangement produces a toroidal circulation of liquid which prevents compaction of the filter cake and reduces clogging of the filter element.

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Widnau, Switzerland

Roland Frei