injection molding wall thickness

The wall thickness of the plastic parts has a great impact on the quality.If the Wall thickness is too small, flow resistance is large, and it is hard to fill the injection mold cavity of big and complex plastic parts. The minimum Plastic parts wall thickness should meet the following requirements:

  • 1, with sufficient strength and rigidity;
  • 2, withstand the impact and vibration of the ejection mechanism;
  • 3, withstand fastening force when assemble.

Injection molding plant would provide a minimum wall thickness. Due to the variety of plastic parts, grades and size, the minimal wall thickness will be different.Too thick plastic parts design is not only a waste of raw materials but also increase molding cycle time as to thermosetting plastic molding; Also, it will affect the quality of plastic parts.The wall thickness of injection molded parts should be as consistent as possible, or because of cooling and Uneven solidification speed, it produces additional stress.

It is critical to determine the reasonable thickness of plastic parts. The wall thickness of the plastic parts is determined by the requirements of the plastic parts, which include the strength, quality cost, electrical performance, dimensional stability and assembly requirements. The general wall thickness has its experience value. Which note the following points:

  • plastic wall thickness should be as uniform as possible, to avoid too thin or thick and wall thickness change. If the plastic parts require wall thickness changes, it should be gradual or arc transition, otherwise it will cause uneven shrinkage and deformation, affecting the strength of plastic parts and melt flowing;
  • the normal wall thickness of plastic parts is 1-5mm. The most commonly used value is 2-3mm;
  • the wall thickness of the ribs and boss should not be too much; it is generally recommended the half of the wall thickness, or likely to cause appearance shrinkage problems;
  • try not to design the part into a separate flat, or it will have uneven or deformed parts