Co-injection methods using endothermic-blowing agents and...

Details Co-injection methods using endothermic-blowing agents and... Co-injection methods using endothermic-blowing agents and...

B - Operations, Transporting

29

C

B29C 45/13 (2006.01) B29C 45/03 (2006.01)

Patent

CA 2364050

The invention provides a method of co-injection molding. The method includes mixing a plastic inner material and an endothermic-blowing agent to form a core mixture. A plastic outer material is injected from a first injection unit into a co- injection manifold to create a flow of outer material therethrough. The core mixture is injected from a second injection unit into the co-injection manifold to create a flow of core mixture therethrough. The flow of the outer material and the flow of the core mixture are then controlled through the co injection manifold and into a mold cavity. The core mixture expands as heat is provided for the endothermic-blowing agent to absorb.

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