The present work investigates the electrostatic charge (ESC) generated from contact and separation as well as sliding of high density polyethylene (HDPE) on the air bubble sheets. They are made of low-density polyethylene (LDPE) of air-bubbles. They have protruding air bubbles that are regularly spaced.The test specimens were prepared from HDPE hollow cylinder of 50 mm diameter, 60 mm height and 1.0 mm thickness. The air bubble sheet was single layer and double layers separated by aluminium film (Al), CF textiles, copper textiles and stainless steel sheet. The HDPE was wrapped by copper and iron wires of 0.15 mm diameter of 50 turns (2500 mm). It was found that, ESC generated on HDPE sliding against LDPE showed increasing trend with increasing the sliding distance. HDPE wrapped by steel wires recorded higher values followed by copper wires, while HDPE free of wires the lowest ESC. It is believed that the intensity of the E-field increased in the presence of iron wires due to the generation of magnetic field whose intensity was higher than that supposed for copper wires. ESC can be reduced by reinforcing LDPE layers by conducting sheet such as CF, Al film and copper textiles. ESC generated on the surface of HDPE after sliding against LDPE reinforced by aluminium film was higher than that observed for CF reinforced LDPE. Finally, after HDPE free of wires, the highest value of ESC was generated on the LDPE reinforced by steel sheet followed by copper textiles.
Ali et al. (Sun,) studied this question.