Powder coating

In flat film extrusion lines, films are usually processed into rolls. Polyolefin plastics and rubber webs are characterized by good stretchability and low slippage. Depending on the winding tension and surface properties, a tendency to stick occurs in the winding, leading to the formation of piston rings, picking and low speeds in the slittering process and high static charges due to separation processes.

In bag manufacturing and processing, adhesion tendency leads to deficiencies in the shingling of bags and process interruptions in the filling lines due to poor bag opening behavior.

POWDER IS NOTHING WITHOUT CONTROL

WEKO powder application systems (WPA) enable the application of a minimal, hardly visible release layer on flat film, rubber webs as well as in and on film pouches. The patented metering system and application nozzles optimized for the process ensure a minimal and uniform powder application of a few milligrams per m².

Release powders made from natural starch or calcium carbonate reduce the adhesion and tack of the films. Films wind up more evenly and run more easily and quickly in the slitter with reduced tensile force.
In bagging and packaging machines, release powder causes smooth guiding and processing. Electrostatic charges due to friction are minimized. This results in higher processing speeds and minimal scrap rates.

Advantages at a glance:

• Precise, minimal and repeatable application rates

• Highest possible application efficiency

• Uniform powder distribution

• Automatic adaptation to film speed

• Resource-saving due to minimal consumption

• Intuitive, easy operation

  The WEKO-AP systems generate a fine powder-air mixture that is sprayed onto the film surface.

With the encapsulated WEKO-ESC the powder-air mixture is applied in a spray chamber. For extremely uniform distribution, the film web is electrostatically discharged. An extraction system avoids contamination of the surrounding area by fine dust particles.