Need Help With Your Plastic Injection Molded Component?

Need help with your plastic injection molded component?   Our engineers have over a combined total of 90 years of plastic tooling and injection molding experience.  They utilize 2D and 3D computer generated files to create mold designs and maintain manufacturability of the plastic parts.  We can serve as your design team or enhance your in-house staff, offering insight and recommendations.  Here is how we can help:

  • Part Design - every part design is unique and our engineers will make sure the part meets all structural and functional requirements for use. 
    • Whenever possible, plastic parts should be designed with a nominal or consistent wall thickness to avoid sink marks, unfilled parts and warp to the part. 
    • Plastic components require draft in order to release from the mold.   Draft is the amount of taper on the vertical walls of the plastic part.  Without draft, a part will either not eject from the mold or sustain damage during ejection.
    • Special part features (holes, undercuts, shoulders, living hinges, threads) or any part feature that cannot release in the direction of the mold separation will require special attention in the design phase.
    • Material considerations are an important factor to ensure moldability of the part. 
  • Mold Design - if one of these items is not designed properly, the quality of the molded part will be affected.
    • Gate locations are important to the mold design because these allow for the mold to fill easily and be small enough to ensure easy separation of the runner and the part but large enough to prevent early freeze-off of flow. Improper gate locations can cause injection molding problems like blisters, bowing, bubbles, burn marks, jetting, shrinkage, short shots, sink marks and warpage.
    • Runner systems are responsible for delivering the melted plastic from the sprue to the gate and into the part. 
    • Cooling system for an injection mold is critical, because poor cooling can result in a rising mold temperature and longer cycle times.
    • Venting of trapped air in the mold cavities is necessary because inadequate venting can produce gas burns, unfilled parts and poor weld line strength, but too much venting can result in excessive flash and poor weld line strength.
  •  Mold Fill Simulation is the use of software to virtually simulate the filling,  packing and cooling of a molded plastic part.  This allows part/mold designers to make critical decisions in the design phase before manufacturing starts.  Crescent utilizes these simulations to analyze production from the beginning of the injection phase, following the process through multiple cycles including the heating and cooling of the mold.
  • 3D Printing Services - to produce 3D printed samples of products.  These can be printed in over 17 different types of materials that can be painted, glued, sanded, drilled or bonded like any plastic component.  3D printed parts allow for a fully functional, hands-on product for design review to get your product to look and feel the way you want.  This also helps to get detailed feedback about your product, to help guarantee success.