Wisconsin Alumni Research Foundation

Eveready Battery Company, Inc.

Xiaofei Sun

Lih-Sheng Turng

Keith J Edgett

Eugene P Dougherty

Patrick Gorton

Chris Lacey

Jungjoo Lee

A method of fabricating an injection-molded component is provided. The method includes the step of introducing pellets into an injection barrel of an injection molding machine. The pellets include a first supercritical fluid. The pellets are plasticized in the injection barrel and a second supercritical fluid is injected into the plasticized pellets. The second supercritical fluid and the plasticized pellets are mixed to form a mixed material. The mixed material is injected into a mold.

Method of fabricating an injection molded component

A method of fabricating a foamed, injection-molded component is provided. The method includes the step of plasticizing pellets including a first polymeric material and a second polymeric material within an injection barrel to form an injection material. The first polymeric material defines a first phase of the injection material and the second polymeric material defines a second phase of the injection material. The first and second phases of the injection material are immiscible. The injection material is injected into a mold to fabricate the foamed injection-molded component having microscale, microcellular voids. Upon tensile loading, submicron, secondary phase cavities are formed in the injection-molded component, resulting in improved ductility and toughness.

Method of fabricating a foamed, injection molded component with improved ductility and toughness

In a method of microcellular injection molding, a polymer and a supercritical fluid are processed. A condition of processing the polymer and/or the supercritical fluid is adjusted to control a weight of a plastic part and/or a surface characteristic of a plastic part produced. In another method of producing a plastic part using microcellular injection molding, a polymer is heated and melted and a supercritical fluid is added thereto. The resulting mix is a single-phase polymer-gas solution comprising the polymer and the supercritical fluid. The polymer and/or the supercritical fluid are adjusted to control the weight of the plastic part and/or a surface characteristic of the plastic part. Once adjusted, the melted polymer with the supercritical fluid is injected into a mold. Upon injecting the melted polymer and supercritical fluid, a pressure drop causes the supercritical fluid to nucleate in the melted polymer, thereby causing nucleation of bubbles.

Methods for microcellular injection molding

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Madison, WI, United States of America

Xiaofei Sun