Carton generates static electricity in printing

**The Role of Cardboard Boxes in Daily Life and the Issue of Static Electricity** Cardboard boxes are commonly seen in our daily lives and work. They are often used to package products, ensuring their safety during transportation. However, some people have noticed that during the transportation process, certain items may come into contact with cardboard boxes and generate static electricity, which can be a source of concern. Letâ€™s explore how static electricity is generated in cardboard boxes. **Friction and Compression Causing Static Electricity** During the printing process, the cardboard paper is subjected to strong compression from the printing plates and rollers. At the same time, it experiences intense friction with the rollers, printing plates, and ink. This friction causes an increase in temperature on the surface of these components, leading to thermal decomposition of molecules. As a result, electrons are redistributed, creating static electricity. **Contact and Separation Leading to Static Charges** In the packaging process, the cardboard paper comes into quick contact and separation with the tape, guide rollers, and ink. Especially when the paper is gripped by the grippers and wrapped around the cylinder, it quickly separates from the cylinder surface after printing. The cylinder is usually covered with materials such as rubber blankets, cotton cloth, or kraft paper. This rapid contact and separation can lead to the generation of static charges on both the cardboard and the cylinder coverings. **Impact of Machine Speed on Static Electricity** As the speed of the printing machine increases, the friction between the cardboard paper and the printing plates, as well as the contact and separation between the paper and the cylinder, also accelerate. This results in more vigorous electron movement and higher energy transfer, ultimately increasing static electricity. For example, high-speed printing machines used for newspapers produce very high static voltages. Even after the newspaper is distributed and delivered to readers, the printed sheets may still stick together due to excessive static, showing how significant the impact of machine speed is on static electricity generation. **Material Properties and Surface Conditions Affecting Static** The printing plates, cylinders, and other components of the printing machine are typically made of metal. Metals have a high ability to conduct electric charge because their outermost electrons can easily detach from the nucleus. In the printing process, static electricity is mainly caused by friction on the surfaces of the cardboard paper, coverings, and tapes. If the surface is smooth and even, less static is generated. However, if the surface is rough, oxidized, corroded, or contaminated, more static will be produced. Additionally, differences in the composition and moisture absorption properties of the cardboard paper can also contribute to static electricity generation during the printing process. **Consequences of Static Electricity in Printing** Static electricity can cause the cardboard paper to shift on the feeding conveyor, making it difficult to drop onto the delivery table. Once there, the sheets may stick together, making it hard for the aligning device to sort them properly, which can affect the folding process in the next stage. The sticking of sheets can also lead to double feeding issues. Moreover, static can cause the paper to move slowly on the feed board, leading to misalignment and resulting in blurred images or ghosting effects. Additionally, static-charged paper can attract dust and impurities, causing the printed image to appear unclear. **Static in Ink and Its Effects on Print Quality** During the printing process, the ink is transferred at high speed through the ink rollers, ink tray, and printing plates. The rapid contact and separation during this process can generate static electricity in the ink, known as "flying ink." Some of this ink may directly fly onto the printed product, causing contamination, while others may land on the printing plate or rubber blanket and later transfer to the printed sheet, causing what is known as "transfer smudging." These stains often appear as fixed light-colored spots and only disappear once the flying ink is cleaned from the plate or blanket. This not only affects print quality but also pollutes the equipment. By understanding the causes and effects of static electricity in the printing process, we can take appropriate measures to reduce its occurrence and improve overall print quality.

Automotive Wiring Harness Protection Sleeve

Automotive Wiring Harness Protection Sleeve,Braided Heat Shrink Tubing,Wear Resistant Heat Shrink Tubing

Shenzhen Huiyunhai Tech.Co., Ltd. , https://www.cablesleevefactory.com