Medical Group.jpgIf you are planning a plastic injection molding project, and want to ensure excellence and product delivery - review these following five considerations to make certain the result is exactly what you need.

1) Do 2d part drawings and 3d cad models exist?

The first question to ask yourself is this; Are you replacing an existing or similar product? Which means there may already be 2d drawings and cad models to work from.

If you do not have 2d part drawings or 3d cad models of the part, these should be provided. The 2d part drawings and 3d cad models provide detailed information on the size and complexity of the part.  

This is really necessary because words can always be interpreted differently, and details can be missed. This could make for significant differences in mold design, as well as cost. 

When done in this way - you can give the plastic injection molder the ability to access the part from a mold design perspective, to define parting lines, and draft angles for proper ejection and gate locations. This will protect and maintain the manufacturability of your parts.

2) What is the application for your product and its material?

It is important for your injection molder to know the end application, and usage conditions.  These include variables such as temperature, chemical contact and resistance. It also includes; 

  • Applied stresses during use 
  • Transparency/opacity 
  • Color, aesthetics
  • Water absorption
  • Lubricity and wear resistance

Your injection molder can then help to recommend a material base properly suited for your application. This is important for the plastic injection mold design stage because different resins have different shrinkage rates, levels of corrosiveness, etc. It is not practical to change resins after the mold has been fabricated.  

This also relates to the type of manufacturing environment required to manufacture the product, for example a clean room may be required. 

3) What will be the annual part volume over the next 3 years, and what is the expected lifespan of the product?

The part quantity determines the type of injection mold build that would be required to manufacture the part.   Also, providing the type of tooling you are considering and tooling budget provides crucial feedback to your injection molder providing the quote. 

It also helps to know the lifespan of the project and project timeline, to confirm the project fits with the injection molder’s capabilities.

4) Are there any special sterilization, assembly and packaging requirements?

These can be incorporated in the plastic injection molding quote. Many injection molders provide a single source solution and offer these secondary operations to help manage and complete your project with one supplier. If this is given upfront, this can be added to the quote for the overall project cost.    

5) What are the quality requirements and the validation requirements?

Does your project require certain quality certifications or registrations like FDA, ISO 13485, ISO 9001, ITAR, etc.?  This will ensure your injection molder has these registrations or certifications as well as knowing they will provide the required documentation and evaluation necessary for your project.   This approach will let the molder know from the start if other validations besides FAIR’s and initial mold samplings need to be performed. 

Plastic injection molding engineers familiar with their manufacturing processes understand how to optimize the mold design to make the most of their equipment and processes in order to better minimize manufacturing variability. 

If you need more information, or wish to partner with a high quality plastic injection molding company, Crescent Industries is the employee-owned, market-influencing organization that has been leading this field for over seventy years. For more information see us at our website;.

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Topics: custom injection molding