How to Control Color Variation in Products During Plastic Blow Molding in Jiangsu-Blow Molding Factory China | KTK

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How to Control Color Variation in Products During Plastic Blow Molding in Jiangsu

Release time:

2023-05-11

Color variation is a common defect in Jiangsu’s blow‑molding process. It stems from numerous production factors, including the resin and color masterbatch used as raw materials, the blending of these components with the base resin, the injection‑molding process itself, and the injection‑molding machine. In practical production, effective control of color variation requires attention to the following five key aspects. Jiangsu Blow‑Molding Processing provides a detailed overview.

Color variation is a common defect in Jiangsu’s blow‑molding process. It stems from numerous production factors, including the resin and color masterbatch used as raw materials, their blending with the base resin, the injection‑molding process parameters, and the injection‑molding machine itself. In practical production, effective control of color variation requires addressing these issues from the following five key aspects. Jiangsu Blow‑Molding Processing provides a detailed overview.

　　1. To eliminate the influence of the injection molding machine and mold components, select an injection molding machine with performance comparable to that of the primary product being molded; if issues such as material dead zones arise, replace the equipment.

　　2. Eliminating the influence of the original resin and color masterbatch, and maintaining precise control over the baseline data, are key to addressing color variation.

　　3. Reducing the impact of barrel temperature on color variation In everyday use, it is common to encounter situations where a damaged or malfunctioning heating zone, or localized overheating due to inadequate temperature control during the heating process, leads to abrupt fluctuations in barrel temperature and, consequently, color variation.

　　4. Minimize the impact of injection‑molding process adjustments: When making adjustments to address color differences, avoid changing the injection temperature, back pressure, molding cycle, or color masterbatch whenever possible. Assess how variations in these process parameters affect color, and promptly correct any color deviations that arise.

　　To control the impact of barrel temperature and masterbatch dosage on product color variation, it is essential to understand the trends in color changes as a function of temperature and masterbatch concentration before ceasing color‑difference adjustments.

　　Everything is made up of atoms, which are composed of protons, neutrons, and electrons. Scientists define protons as positively charged, neutrons as having a slight charge, and electrons as negatively charged. Under normal conditions, an atom has an equal number of protons and electrons, resulting in a net neutral charge. However, external influences—such as collisions or forms of energy like kinetic, potential, thermal, or chemical energy—can disrupt this balance. In everyday life, what we call “friction” is essentially a process of minor breakage, impact, and separation. Small-scale interactions can also give rise to static electricity, including induction‑based charging, thermoelectric and piezoelectric charging, Helmholtz‑layer charging, and jet‑induced charging. Whenever two objects made of the same material come into contact and then separate, static electricity is generated; moreover, even the air itself can become statically charged.

　　Plastic materials are produced through blow molding in Jiangsu and processed into semi-finished or finished plastic products. Because most plastics are poor conductors, they exhibit excellent insulating properties; during manufacturing, they are prone to generating static electricity due to processes such as transfer, contact, separation, friction, impact, and electromagnetic induction. This static charge can remain on the surface of objects for extended periods, and once it accumulates to a certain voltage level, it may result in electrostatic discharge damage.