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How to remove static in the paper web surface during paper jumbo roll slitting and rewinding?

March 01,2024

Static electricity is a headache problems for printing and packaging productions manufacturers. The static in the surface of paper will cause the printing quality problems,feeder trips off, ink offset and so on.

There are some ways to solve static electricity charge problems in blow.

GROUNDING - Plant machinery should be grounded to a steel rod driven into the ground, ultimately as deep as eight feet, depending upon voltage currents, local electrical codes, and manufacturer specifications. A properly grounded machine will help dissipate high charges of static electricity from semi-conductors such as coated paper. When properly grounded, metal core tinsel can dissipate static by induction. The tinsel must be tightly stretched approximately 1/8" from the paper surface without contact. It is best placed across the pile at the feeder head at the point of sheet separation and across the feedboard where adequate air space exists under the sheet. The tinsel should then be attached to a properly grounded press or other conductive object.

IONIZATION - Electronic static eliminators, or neutralizers, use a high-voltage discharge to ionize the surrounding air; the ionized air acts as an electron source which, in turn, neutralizes the static charge on the paper. In-line air ionizers are simple to install in the feeder blower line and very effective if installed properly. As the air blows between the sheets, the paper surfaces build up similar, or like, charges that now repel each other, enabling sheet separation. It is recommended that these in-line ionizers be replaced annually. Be sure that air blower filters and blower heads are clean with adequate air pressure and distribution to insure optimum sheet separation. Ionizing string and/or elastic cord dissipates static electricity with tiny conductive micro-fibers that cause the static charge to ionize and flow to the ground. It is easily placed in multiple locations both over and under the sheet, but is most effective in removing static as it emerges from the stack or roll.Anti-static or silicone sprays increase conductivity and minimize excessive contact from friction by applying a thin silicone or soap-based coating to the machine components that transport the material. Application to contact points such as the feedboard, transport tapes, and wheels can be helpful.

HUMIDITY / TEMPERATURE - Adequate moisture in a conditioned pressroom increases conductivity and helps dissipate static charge. A properly climate-controlled facility includes humidification that maintains 45% (+/-5%) Rh @ 72° (+/-5°) F. for North America and 52% (+/-5%) Rh @ 21° C. for Europe. Ambient relative humidity below 35% Rh can adversely affect paper and decrease conductivity, which results in greater potential for static. Paper, properly acclimated to recommended pressroom temperature, has a better chance of running static-free as compared to cold paper. To maintain the relative humidity of paper consistent with original moisture content, do not unwrap paper any sooner than necessary before going to press. Paper can be properly acclimated to pressroom temperature without unwrapping. (See Sappi technical tip sheet on Paper Conditioning & Characteristics). — Avoid storing paper in proximity to extreme hot or cold sources and minimize exposure to high heat in the drying process which may adversely decrease moisture content. Keep press IR dryers to a minimum with pile temperatures not to exceed 95° F. / 35° C. If static and smooth-surfaced sheet cling make feeding difficult in a properly controlled pressroom environment of 40% Rh or greater, it might be helpful to gently hand-wind the paper and rebuild feeder loads just prior to running on press. This consideration may improve sheet acclimation and separation but be sure to minimize any potential for surface friction during the process. Static is a common problem in web heatset sheeting and post-press converting due to the extremely low moisture content of the paper after drying at high temperatures. Re-moisturizing the web after the chill rolls with a mix of water, silicone, and liquid fabric softener can increase conductivity and reduce surface contact from friction, ultimately minimizing static while helping the paper re-acclimate to ambient environment. There are numerous websites available offering anti-static products and solutions which effectively neutralize the presence of static electricity. It is important to note, however, that static electricity is only managed and not entirely eliminated. Semi-conductive materials such as coated paper will always be susceptible to static if once again subjected to the adversities of high contact through pressure and friction, and/or low humidity. 

In the paper slitting rewinding machine,we use the second way to eliminate static electricity charge in the surface of material. We normally installed two sets static eliminators bars in the rewinder shafts.

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