Metal Fin (Tube) Electrodes

• Traditionally film extrusion lines utilize a metal tube electrode and covered roll configuration.
• For simple applications that do not require lane treating a fixed width metal tube electrode provides adequate treatment levels. For demanding fixed width applications a powerful metal fin electrode is ideal.
• It is important to understand the benefits of stainless steel over aluminum. Aluminum material is low in cost and an easy material to fabricate, so it could be argued that aluminum is an excellent choice for electrode construction. That is until one looks at what happens to an aluminum electrode during use.
• The corona process creates a harsh environment for the electrode. Aluminum will oxidize over time causing the segments to stick together. This problem causes areas of treatment or non treatment along the width of the electrode. Also, aluminum is a good conductor of heat. Corona electrodes operate in temperatures of 150 to 180 degrees C. At these temperatures it is very difficult for the aluminum electrode to remain parallel to the ground roll. Once the aluminum electrode warps the air gap between the face of the electrode and the roll surface changes and so does the corona and ultimately the dyne level.
• It is for these reasons PVN Techno Systems LLP recommend stainless steel tube electrodes as they offer superior performance, durability and lower cost over the life of the treater.
• In many cases it’s the old “You can pay me now or pay me later” syndrome. So be sure to evaluate your budget, short/long term needs, and the importance of reliability and consistent performance.

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