Metal Industry

Trapping of Cold-rolled Coil Protective Sheet

Cold-rolled coil is wrapped with a protective sheet before shipment. The protective sheet is charged with static electricity by separation during unwinding.
The charged protective sheet generates an induced charge on the surface of the cold-rolled coil, which causes a force to attract the protective sheet. As a result, the protective sheet gets trapped in the roll.

Trapping of Cold-rolled Coil Protective Sheet

Conventional countermeasures


  • Repeated packaging makes the work time longer.
  • Workers may get an electric shock.

Countermeasures with static eliminators (ionizers)

An ionizer eliminates the necessity for repeated packaging and shortens the work time. The work environment is also improved.

Countermeasures with static eliminators (ionizers)

Improvements and Effects
Words from the worksite

Shortened work time

Shortened time: 50 hours/month x time charge of $20/hour = $1,000/month

In addition, the work environment can also be improved.