Views: 5 Author: Huan Machinery Publish Time: 2021-07-08 Origin: Huan Machinery
When the extrusion blow molding machine is producing plastic products, static electricity will be generated during the drop time of the plastic parison in the open mold. Static electricity may cause a series of problems. This article will show you why static electricity occurs during the blow molding process.
Causes of static electricity in extrusion blow molding process
Any substance is composed of atoms, and the basic structure of atoms is protons, neutrons and electrons. Scientists define protons as positive, neutrons are uncharged, and electrons are negatively charged. Under normal conditions, the number of protons and electrons of an atom are the same, and the positive and negative charges are balanced, so it appears uncharged to the outside. However, due to external effects such as friction or in the form of various energies such as kinetic energy, potential energy, thermal energy, chemical energy, etc., the positive and negative charges of the atoms will be imbalanced. The friction in daily life is essentially a process of constant contact and separation. In some cases, static electricity can be generated without friction, such as induced electrostatic electrification, pyroelectric and piezoelectric electrification, Helmholtz layer, jet electrification, etc. Any two objects of different materials can generate static electricity as long as they come into contact and separate. Of course, flowing air can generate static electricity.
When there is more than one parison on each mold, the static charge always has the same polarity, so the parisons will repel each other. In this case, it is usually impossible to transfer the object to the tool, and the pressure on the molded product Wires can also cause quality problems; for a single parison, when a single parison is adsorbed by the metal parts of many machines, similar problems will also occur.
Plastic materials are produced and processed into plastic semi-finished products or finished products. Since most plastic materials are poor conductors and have good insulation properties, they are very easy to handle, contact, separate, friction, collision, and interfere with electromagnetic induction during the production process. If static electricity is generated in occasions, and staying on the surface of the article for a long time, it will cause static electricity hazard after it has accumulated to a certain static voltage value.