Thermoplastic resin is the most common type of polymer used in the injection molding process. There are several different types of thermoplastic resins with varying properties, including shrink rate, resistance to high temperatures, resistance to corrosives, elasticity, adhesion, finish such as polished or matte, and fatigue strength.
These are all very important considerations when designing an injection mold to manufacture parts molded from thermoplastic resins. Shrink rate is extremely important, as the cavities in the tool would have to be adjusted for such shrink rate. Cooling rate is also very important to consider during mold design, and is important for ejection. The part must be completely set and solid prior to ejecting from the mold.
When designing a tool for injection molding with thermoplastic resin, mold flow analysis may be helpful or even necessary to identify any critical areas in the part design. Mold flow analysis is a computer aided simulation that shows clearly how the material will flow, based on its own individual properties.
By predicting these critical areas ahead of time, the mold designer can adjust for tight tolerances, problem areas for material flow and fill, and to identify the optimum location for gating. This is a valuable tool when designing precision molds for critical components, and is a useful tool to avoid costly mistakes and improving lead times.
While mold flow analysis can be a valuable tool, the best knowledge of how particular thermoplastic resins flow comes from experience. Experienced mold designers are well aware of the specific properties of different polymers, using that knowledge to design the tool properly to mold the part to print.
Michiana Global Mold has more than 500 years of combined experience designing and building injection molds for various industries. We utilize advanced technology combined with skilled journeyman moldmakers and vast resources to construct quality tools for injection molding of thermoplastic resins.
Contact Michiana Global Mold today to speak with one of our skilled and experienced mold designers to learn how we can assist you with your injection mold requirement. We are an ISO9001:2015 Registered mold making company with vast experience constructing custom, precision injection molds for various industries.