The type of film, contact method, contact duration, contact area, and separation speed all influence the resulting electrostatic discharge time and voltage. Electrostatic discharge poses significant risks; therefore, depending on production conditions, the intended use of packaging materials, and customer usage requirements, various antistatic technologies can be implemented to effectively eliminate static electricity.

　　1. Physical Elimination Method

　　The physical elimination method uses the inherent properties of static electricity to remove charges without altering the material's functionality.

　　For instance, the "grounding elimination" method involves installing an anti-static brush directly into the production process. Position the brush at the winding or unwinding point of the plastic roll material, ensuring that the grounding end of the anti-static brush is securely connected to a proper ground—never to the equipment or guide rollers. This is crucial because equipment may have poor grounding, and the department’s guide rollers undergo anodizing treatment, forming a layer of aluminum oxide on their surface. Unfortunately, aluminum oxide is non-conductive, which could compromise the effectiveness of the grounding system.

　　2. Chemical Elimination Method

　　Chemical static elimination, also known as antistatic agent treatment technology, involves modifying the electrical properties of resins or substrates by either adding antistatic agents through blending techniques or applying them via coating methods. This approach is considered one of the most thorough and effective antistatic solutions available. However, since the addition or application of antistatic agents alters the material's chemical composition, this technique is best suited specifically for modifying plastic resins.

　　Especially in packaging food, pharmaceuticals, cosmetics, and chemical products, it’s crucial to pay attention to safety, hygiene, and compatibility with the base resin—and these factors make the technology particularly advanced. Packaging materials with antistatic properties not only prevent various quality-related incidents caused by static electricity but also enhance packaging efficiency for customers, ensuring strong sealing performance. As a result, they have earned widespread customer approval.

　　3. Additive Processing Technology

　　This technology involves mixing an additive-type antistatic agent with a thermoplastic resin at a specific concentration, along with various additives. The mixture is then melted, thoroughly blended, and granulated to produce an antistatic masterbatch.

　　When selecting an antistatic agent, it's important to consider its compatibility with the base resin. If compatibility is too poor, the resulting antistatic particles will exhibit inferior performance. Conversely, if compatibility is too excellent, the antistatic agent will migrate to the surface too slowly, making it difficult for an effective antistatic water film to form. To ensure optimal results, choose a base resin that matches the resin used in the final product. Additionally, during the melting, mixing, and pelletizing processes, keep the processing temperature as low as possible to prevent the antistatic agent from decomposing or degrading due to its poor thermal stability.

　　To prepare antistatic plastic films using antistatic particles, a three-layer co-extrusion blow-molding process is commonly employed. Note that the proportion of antistatic masterbatch added should be determined based on the concentration of its active ingredient, and adjusted appropriately according to test results—ideally achieving a surface resistivity (ps) of around 10¹¹ Ω. Increasing the addition amount not only raises production costs but can also negatively impact subsequent processing steps.

　　4. Coating-Based Treatment Technology

　　The coating-type antistatic treatment technology involves formulating ionic surfactants into an antistatic coating, which is then applied to the surface of plastic films to prevent static charge buildup.

　　The selection of coating-type antistatic agents should be determined based on the work function of the substrate being coated. Plastic materials with a high work function tend to accumulate negative charges, while those with a low work function are more likely to develop positive charges. For instance, PP and PE readily pick up negative charges, making cationic surfactants the ideal choice for coating; in contrast, PET and PA easily accumulate positive charges, so anionic surfactants are recommended for their coating applications.

　　Notably, the plastic film here requires a surface wetting tension greater than 38 dyn/cm; the antistatic coating exhibits excellent film-forming properties, is highly resistant to abrasion and chemical attack, and provides long-lasting performance.