Dos and Don’ts in Plastic Product Design

Plastic products are generally used every day. In the past few years, plastic products have drastically increased the number of end customers because they are light in weight and a good alternative in automotive, aerospace consumer goods, and electrical besides electronic sectors. The plastic parts we currently use are all injection molded parts manufactured in high volumes.

Everything is made from plastic as the user’s comfort is considered. The primary use of gadgets includes WiFi dongles, cameras, AirPods, and wearables. You can learn everything about product design once you join the Plastic Product Design Course In Bangalore.

Some do’s of the plastic product design.

  • Uniform wall thickness

The main thing you must consider while designing plastic products is maintaining the wall thickness. If we do not maintain the wall thickness, you will have an uneven plastic feeling inside the cavity. The inner thickness area needs to be cooled quickly. In contrast, dense areas take some time to be cold, which will result in warping and also some type of air bubbles or excess material formation inside the part that will affect the quality of the Final product. Sudden changes in thickness can lead to short fill and sink marks formation shrinkage. Maintaining the wall thickness uniformly is recommended to avoid any issues.

  • Wall thickness transition

When the wall thickness transitions happen suddenly, it will experience different cooling and shrinkage rates. This will lead to molding. You can avoid the solid sections to get better quality end products.

  • Draft angle

The draft angles are one of the most critical design requirements for plastic products. They should be in the design to eject the part from the mold. A minimum one-degree draft angle would be needed for easy part ejection. The radius at the corner is recommended for seamless ejection.

  • Ribs

Ribs are added to strengthen the walls, and it is recommended to avoid any warpage. The rib thickness must not go beyond or be the same as the wall thickness. Filling problems will be experienced if rip thickness exceeds wall thickness. You should maintain at least 60% of rib thickness to the wall thicknesses, so sink mark issues are avoided.

Don’ts of the plastic product design

  • Radius

Experts offering plastic Product Design Course In Chennai suggest adding a radius will help the material flow process. The radius should be minimum in the given ratio. Providing a radius more than the wall thickness ratio would enhance the chance of any sink mark.

Sink mark control

Sink marks would be the depression in the plastic parts mainly due to extra thickness or uneven cooling. There are different ways to avoid sink mark issues, as you can create a recess area near the bosses, and the ribs would reduce the thickness in that area.

  • Removing the undercut

Undercut would be a feature in the mold part that will affect the ejection mold parts. When you reduce the undercuts, you can make the moulZd budget-friendly.


Hence these are some of the dos and don’ts of plastic product design. Enrol on the plastic product design course to explore more on the subject.