Two Shot Molding
"Two-shot injection molding assemblies are used in order to create a plastic part made of two different materials or two different colors of the same material or different material. A typical two-shot injection molding assembly will inject the first material into the mold while the area of the mold that is intended for the second material is blocked off. After that the mold is opened, the core plate is rotated, the mold is blocked off again, and the second material is injected into the mold. After the second material is injected, the material from the first and second injection touch and form a mechanical bond while cooling." (Cipkar; William A., Crest Mold Technology Inc. (US Patent 7,559,763, July 14, 2009) “Dual material injection mold and method”)
Recent US Patents
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7/20/2010
7,758,787
Multi-shot injection molded component and method of manufacture
Grems et al of Intier Automotive has developed an injection molding method for automotive interior door panels; a resin for the core is injected into the cavity, followed by a second different resin before the first resin is completely cured or hardened. (RDC 10/1/2010)
7/14/2009
7,559,763
Dual material injection mold and method
Cipkar of Crest Mold Technology has developed a two shot injection molding system, in which the tooling for each shot is different and moved in or out of the molding path during the molding process. (RDC 10/1/2010)
Recent Journal Articles
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Review Articles
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Editor's Notes
As the literature is reviewed, and items of interest concerning this topic are found. These may be added in an abbreviated form with the reference. Readers and contributors are invited to add their own notes. Contributors may add them directly and other readers can simply send their notes to the editor, Roger Corneliussen at rcorneliussen@4spe.org. He may edit and add them to this page at his discretion.