Hazards of Static Electricity in Book Printing

Hazards of Static Electricity in Book Printing

Book printing is carried out on the surface of the object, and the electrostatic phenomenon is mainly manifested on the surface of the object. During the printing process, due to friction, impact and contact between different substances, all substances involved in printing generate static electricity.

The surface of the substrate is charged, such as paper, polyethylene, polypropylene, cellophane, etc., which will absorb paper scraps or dust, impurities, etc. floating in the air, which will affect the transfer of ink, make the printed matter bloom, etc., resulting in a decrease in the quality of the printed matter.

During the printing process, due to high-speed friction, peeling will generate static electricity. When the static electricity accumulates, it will easily lead to air discharge, causing electric shock or fire. When the voltage is very high, the charged ink will cause the ink and solvent to catch fire, directly threatening the safety of the operator.

1. Material properties include the internal chemical composition of the material, the internal structure of the material, the mechanical characteristics of stress and strain, the shape and conductivity of the material, etc. The conductivity of the material has a dual effect on static electricity. First, if the material is a conductor, the charge moves freely on the surface, the distribution of this charge on the surface causes a lower voltage, and the conductive material contacts the ground and immediately transfers the charge to the ground. Insulating materials are different from conductors. Paper, plastic films, etc. in most printing materials generate static electricity to form a higher voltage, which cannot be eliminated by grounding.

2. Ambient environmental conditions include gas composition and pressure, temperature, humidity, etc. around the contact object (material).

3. The mechanical action includes the type of contact between the two materials, the contact time, the contact area, the separation speed, and the nature of the material force. The closer the two materials are in contact or the faster they separate, the more static electricity is generated.