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In injection molding of thermoplastics, molten polymer is forced into a colder mold cavity, where it cools and solidifies to take the shape of the mold cavity. All polymeric materials will shrink when cooled from melt state to a solid state, which can be described on PVT diagrams. The injection molding cycle consists of the following stages: plasticizing, injection, cooling, and ejection or de-molding. Experimental Guide: The independent variables are polymer crystallinity, filler, temperature, injection pressure and the cycle times. The dependent variables are the warpage and shrinkage of the molded part. Morgan Press (injection molding machine) Operation : Switch on the pneumatic power to the machine by selecting the injection speed control/ram pressure on the injection pressure regulator on the back of the machine. The suggested value is between 6000 to 8000 psi. You need to purge the system if a different material is present in the barrel. If this is the case and the polymer will not inject, try raising the temperature until the polymer will inject. Warpage Analysis The thickness should be measured for each sample using the vernier caliper provided. Also, devise a method for measuring warpage. PVT Analysis Calculate the specific volume of the unfilled polypropylene disks at various temperatures and pressures. Use the PVT data provided (located in the library, and listed below in the references) to calculate what the specific volume of polypropylene should be for any given pressure and temperature. Compare these two values.
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