The formula to calculate the Mold Shrinkage Percentage (MS) is:
\[ MS = \left(\frac{D - F}{D}\right) \times 100 \]
Where:
Mold shrinkage refers to the phenomenon that occurs in the plastic injection molding process where the molded part shrinks and contracts as it cools down and solidifies in the mold. This shrinkage is caused by the thermal contraction of the plastic as it cools from the processing temperature to room temperature. The degree of shrinkage is influenced by several factors including the type of plastic material used, the design of the part, the molding process parameters, and the design of the mold itself. It is a critical factor to consider in the design and manufacturing process as it can affect the accuracy and precision of the final product. If not properly accounted for, mold shrinkage can lead to parts that do not fit together properly or function as intended.
Let's assume the following values:
Using the formula to calculate the Mold Shrinkage Percentage (MS):
\[ MS = \left(\frac{D - F}{D}\right) \times 100 = \left(\frac{100 - 98}{100}\right) \times 100 = 2\% \]
The Mold Shrinkage Percentage (MS) is 2%.