Temperature plays an important role in adjusting viscosity. Materials that are a lower viscosity than styrene are recorded in MSDS data as negative values. As such, materials that are at a higher viscosity than styrene are recorded as positive. Styrene falls in the middle of the material scale, and is considered to be the mean. For instance, nylon flows thinner and faster than styrene, thus nylon has a lower viscosity than styrene. Materials that are low viscosity flow thin and quick, while high viscosity materials flow thick and slower. The same terminology applies in different plastic injection materials. Molasses would be considered to be high viscosity, and water would be low viscosity. If you were to pour water and molasses at the same time, water would flow much easier than the molasses. A good comparison would be the difference between molasses and water. Viscosity as it relates to plastic injection is the measurement of how thick or thin a material flows. This article will first explain viscosity, and then delve into different situations where viscosity may help or be hurting a processors goal of zero scrap and high output. It is also one of the most important factors in a molder’s arsenal of making process changes. Material viscosity strongly effects standardized molding processes.
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