Injection molding micro-cellular

Recently, the telecommunication industry has undergone rapid expansion, and a strong consumer trend towards smaller and lighter telecommunication devices, such as cellular phones and notebook computers, is indicated. Small connection sockets and chip carriers are micro-injection-molded parts requiring the high flowability, high mechanical properties and dimensional stability of LCPs. These merits are now thought to be another application field for LCPs in the electronics industry. 

R R. Jones, Handbook of polymer-fiber composites. New York Langman, 1994, p. 78. A. K. Bledzki and O. Faruk, Effects of the chemical foaming agents, injection parameters, and melt-flow index on the microstructure and mechanical properties of micro-cellular injection-molded wood-fiber/polypropylene composites. Journal of Applied Polymer Science, 97,1090-1096 (2005). 

It was determined in this case that both in-cavity (behind ejector pin) pressure transducers and temperature sensors can be utilized to monitor micro-cellular injection molding and should be able to be developed as a basis of a process control model. For the pressure transducer, the gate location appeared to track part weight and dimensions more closely than at the end of fill, across the range of process changes. 

---