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Viscosity Curve

Purpose The purpose of this test is to determine the optimum injection velocity for a particular material, mold, and part design. This spreadsheet can be used to provide a graphical representation of molecular alignment (orientation). The faster a plastic material is injected, the more aligned (oriented) the molecules become. Procedure 1.) Load the tool 2.) Begin by attempting to process full part(s) 3.) Once the part is filled out, it is time to begin collecting data 4.) The 'fill time' and 'pressure at transfer' will be inputs obtained from the machine display 5.) The 'machine set velocity' will be the only setting that the operator will adjust 6.) Begin adjusting the injection velocity in nominal increments 7.) Record the fill time and pressure at transfer after every adjustment 8.) Repeat this procedure 15 times to develop the curve below 9.) Once a curve has been created, pick a location at which the curve begins to break 10.) Adjust this point to a few settings faster to accommodate changes in material viscosity 11.) Mark this location with an X on the chart to the left in the column titled 'break point' 12.) This value should be used as the optimum injection velocity Results The apparent viscosity curve starts almost vertical and then begins to transition to a horizontal line. This curve represents the a maximum alignment that molecules in a polymer can endure. The point at which the curve begins to transition is referred to as the 'break point' and is the optimum value for velocity and pressure. The break point is the slowest recommended injection velocity. The injection velocity should be slightly adjusted to accommodate variation in material viscosity. Note "Note: The relative viscosity delta graph helps users indicate where the relative viscosity has stabilized. A flat line shows where the relative viscosity is stable therefore the selected ""Breakpoint"" should be selected within the stable range. " Please Like, Share, & subscribe