Method and apparatus for injection molding foamed plastic articles using a pre-pressurized mold having fixed core members with controlled venting
Method and apparatus for generating foamed thermoplastic materials
Process and apparatus for injection moulding and mouldings produced thereby
Method of forming an article consisting of a foam core and one or more covering layers Patent #: 5374383
ApplicationNo. 639717 filed on 04/29/1996
US Classes:264/54, Chemical blowing264/52, Utilizing expansion retarder264/500DIRECT APPLICATION OF FLUID PRESSURE DIFFERENTIAL TO PERMANENTLY SHAPE, DISTORT, OR SUSTAIN WORK
ExaminersPrimary: Kuhns, Allan R.
Attorney, Agent or Firm
Foreign Patent References
International ClassB29C 044/10
AbstractFoamed articles having excellent properties are prepared by partially filling a mold with foamable composition, pressurizing the mold while heating to activate blowing agent and crosslinking agent, and releasing the pressure while the polymer is at least partially crosslinked to permit the foam to fill the mold.