WEKO Weitmann & Konrad Non-Contact Application Systems

Engineering Principles of WEKO Contactless Rotor Fluid Application

WEKO-Fluid-Application technology relies on high-speed rotary atomizers to disperse functional liquids into fine aerosols via pure centrifugal force.

Liquids are fed directly into the rotor center without compressed air assistance, producing calibrated micro-droplet streams with uniform kinetic energy.

Precisely configured rotor windows generate overlapping spray fans that deliver completely seamless coating across the full material web width.

Integrated mechanical shutter assemblies instantly mask spray streams during line deceleration or stops, preventing overwetting and localized material defects.

Anti-Set-Off Powder Application Dynamics with WEKO-AP and ESC Systems

In high-speed offset printing and film extrusion lines, web blocking is eliminated by precision metering of anti-set-off powders via WEKO-AP spray bars. Specially calibrated dosing nozzles disperse micro-fine powder and air mixtures across the substrate, preventing ink offset and sheet cohesion.

Enclosed WEKO-ESC electrostatic systems ionize powder particles with a uniform charge, driving them directly toward the grounded substrate. This electrostatic attraction maximizes transfer efficiency, slashes raw powder consumption and keeps the pressroom atmosphere clean.

Web Re-Moistening Protocols with WEKO-RFS Damping Systems

Web offset presses equipped with high-temperature drying ovens cause severe paper dehydration, resulting in sheet waviness, folding cracks and high static charges. WEKO-RFS units apply a micro-thin water film indirectly onto a transfer roller that smoothly conditions the moving web.

Microprocessor speed compensation meters fluid volume in direct proportion to press line speed, restoring natural cellulose moisture equilibrium without streaking. An internal closed-loop water circulation circuit recycles unused fluid, ensuring exceptional operational economy.

Turnkey Integration of Modular WEKO Coating Tower Systems

WEKO Coating Tower assemblies deliver a fully integrated, compact footprint for retrofitting existing polymer film extrusion and paper converting lines. The single-tower framework houses contactless dual-sided rotor spray chambers, air leveling ducts and rapid infrared curing cassettes.

Eliminating mechanical contact rollers prevents elongation, scratching and surface stress on delicate optical and barrier foils. The intuitive touch-screen interface stores job-specific coating profiles, delivering outstanding batch-to-batch repeatability.