Mold runner for prevention of in-mold coating flow
AssigneeOMNOVA Solutions Inc.
InventorJohn A. Thompson
Life of this patent
Estimating the term…
Abstract
A mold runner for a runner or sprue type injection molding apparatus. The mold runner allows the passage of a substrate material from an injection source into a mold cavity and contains a containment shroud which utilizes the relative incompressibility of the substrate material in the containment shroud which prevents an in-mold coating, which is injected into the mold cavity in a subsequent step, from flowing into the injection substrate source thereby contaminating the same.
Claims16
A molding apparatus for injection molding an article and in-mold coating the molded article, comprising:
- a mold defining a mold cavity;
- a first composition injector for injecting a first composition into the mold cavity to form a molded article therein;
- a mold runner passageway having a containment shroud spaced from ends of said mold runner passageway and fluidly connecting said first composition injector and said mold cavity, said containment shroud having a base portion and a terminal portion opposite said base portion, said terminal portion has a terminal portion axial width less than said base portion axial width;
- and
- a second composition injector fluidly connected to the mold cavity for injecting a second composition into the mold cavity to in-mold coat the molded article, said containment shroud for preventing said second composition from passing through said mold runner passageway to said first composition injector.
A molding apparatus, comprising:
- at least one mold member at least partially defining a mold cavity;
- a first composition injector for injection molding a molded article in said mold cavity;
- a mold runner passageway defined in said at least one mold member and fluidly connecting said first composition injector and said mold cavity;
- a second composition injector fluidly connected to said mold cavity for in-mold coating said molded article in said mold cavity;
- and
- a radially tapered containment shroud disposed along and spaced from both ends of said mold runner passageway for preventing in-mold coating of said mold runner passageway to said first composition injector.
A molding apparatus, comprising:
- first and second mold members defining a mold cavity;
- a first injector dispensing a first composition into said mold cavity through a mold runner passageway and forming a molded article, said mold runner passageway defined by at least one of the first and second mold members;
- a second injector injecting a second composition into said mold cavity and onto said molded article to in-mold coat said molded article;
- and
- a containment shroud annularly surrounding said mold runner passageway to prevent said second composition from reaching said first injector said containment shroud having an axial length less than an axial length of said mold runner passageway.
Dependencies are inferred from the claim text.