Jetting (injection moulding defect)

Jetting is an moulding defect that can occur in the manufacturing process of injection muolding. Jetting is a snake-like stream which occurs when polymer melt is pushed at a high velocity through restrictive areas.[1]

Jetting

Effect
  • Surface blemishes
  • Part weakness

Prevention methods
  • Design a feed system to direct the melt against the metal surface of mould (see example of edge gate and overlap gate)
  • Use an optimized ram speed profile so that melt front velocity is initially slow. [2]
gollark: Oh, hold on, I made a minor mistake.
gollark: <@356107472269869058> I finished my explainer thing for length terminated strings.
gollark: Your server isn't running.
gollark: [REDACTED AND EXPUNGED COMPLETELY AT THE SAME TIME]
gollark: Is the server code up? Perhaps you must pinginate osmarks.net.

References
  1. "The Importance of Gate Geometry".
  2. "Mitsubishi Engineering Plastics Guide" (PDF).
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.