Indispensable Tools For “Moisture Control” On Plastic - Mark 3
Moisture Analyzing is an important process in plastic molding industry but mostly neglected. Engineering plastic, such as PA (Nylon), PC and PET, are hygroscopic. They adsorb moisture from the humid ambient air and give it back during the dry days. And every type of resin can hold a certain amount of moisture between its molecular chains.
According to the research, the presence of excessive moisture in resin has significant effect on its physical properties, i.e. weight, density, viscosity, melt flow index and conductivity. These properties are directly related to the resin’s working conditions and will finally affect the molded parts. i.e. mechanical strength and appearance.
During the injection process, excessive moisture in resins vaporizes and condenses on the surface of the mold. Splay, silver streaking, internal bubbles or craters are commonly found defects on the molded parts. In the worst case, the moisture may even cause attrition to the mold over a period of......
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Approximate Pages: 3 (250 words per double-spaced page)
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Indispensable Tools For Moisture Control On Plastic - Mark 3
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