초록 ▼

The present invention relates to an improved method and apparatus for injection molding and cooling molded articles such as preforms so as to avoid crystallinity. The apparatus and method make use of a take-off plate for removing articles from a mold, which plate may include heat transfer devices fo

The present invention relates to an improved method and apparatus for injection molding and cooling molded articles such as preforms so as to avoid crystallinity. The apparatus and method make use of a take-off plate for removing articles from a mold, which plate may include heat transfer devices for cooling exterior surfaces of the molded articles or preforms, and a system for cooling in a controlled manner interior surfaces of the molded articles or preforms.

대표청구항 ▼

1. A method for forming a molded article comprising the steps of:forming a molded article within an injection mold, removing said molded article from said injection mold while said article retains an amount of heat; inserting a cooling pin having an outlet nozzle in its rip portion into the interior

1. A method for forming a molded article comprising the steps of:forming a molded article within an injection mold, removing said molded article from said injection mold while said article retains an amount of heat; inserting a cooling pin having an outlet nozzle in its rip portion into the interior of said molded article after said molded article has been removed from said injection mold; directing a flow of cooling fluid toward a dome portion of said molded article where crystallization occurs so as to substantially prevent said crystallization in said dome portion and thereby form a molded article which is substantially free of any crystallization; cooling exterior portions of said molded article after said molded article has been removed from said injection mold; providing a take-off plate having a holder for said molded article, said holder having a plurality of openings for exposing exterior portions of said molded article to a flow of cooling fluid; said removing step comprising loading said molded article into said holder in said take-off plate; and said exterior cooling step comprising providing a cooling platform with a plurality of nozzles connected to a source of cooling fluid, positioning said cooling platform adjacent said take-off plate, and blowing a cooling fluid through said nozzles and through said openings in said holder onto said outer surfaces of said molded article.