Injection nozzle having a raised land portion
OwnerNorman S. Loreninventor
Life of this patent
Estimating the term…
Abstract
A unitary nozzle for use in a gas assisted injection molding process wherein the nozzle includes a central axial resin passageway, a land portion of the nozzle extends radially into the resin passageway proximate the downstream or discharge end of the nozzle to define a generally U-shaped resin passageway terminating in a U-shaped aperture at the nozzle tip, and a central gas passageway is provided on the central axis of the nozzle within the land portion and exiting the nozzle in a circular aperture embraced within the U-shaped resin aperture at the downstream end of the nozzle so that mixing of the resin and gas during the injection and venting processes is minimized and so that ingestion of resin into the gas passageway during the venting process is minimized.
Claims19
An elongated resin and gas injection nozzle defining a downstream nozzle tip, said injection nozzle including an axially extending resin passageway opening in a resin aperture in said nozzle tip, a raised land portion extending radially inwardly into said resin passageway from the axial boundary wall of said resin passageway, and a gas passageway extending axially in said land portion and opening in an aperture in said nozzle tip, said land portion extending axially from said nozzle tip to a location upstream of said nozzle tip and being configured such that a cross section taken through said injection nozzle at any axial location from said tip to said upstream location includes solid land portion material extending radially and continuously inwardly from said boundary wall and enclosing said gas passage.
An injection nozzle comprising a main body nozzle portion defining a central axis and terminating at a downstream end thereof in a nozzle tip, a central axial resin passageway extending along said main body portion and opening in said tip in an aperture not including a solid land portion of said nozzle that projects radially into said resin passageway and includes said central axis, and a gas passageway including an axial portion extending essentially along said central axis within said land portion and opening in said tip in an aperture that is generally coplanar with said resin passageway aperture, said land portion extending axially from said nozzle tip to a location upstream of said nozzle tip and being configured such that a cross section taken through said injection nozzle at any axial location from said tip to said upstream location includes solid injection land portion material extending radially and continuously inwardly from said boundary wall and enclosing said gas passage.
A resin and gas injection nozzle comprising:
- a main body portion defining a central axis and terminating at a downstream end thereof in a nozzle tip;
- and
- an axial resin passageway extending within said main body portion and embracing a raised land portion of said main body portion extending radially into said resin passageway and extending upstream in an axial direction from said nozzle tip;
- said raised land portion defining an axial gas passageway and said resin passageway and said gas passageway terminating in separate apertures in said nozzle tip;
- said raised land portion extending axially from said nozzle tip to a location upstream of said nozzle tip and being configured such that a cross section taken through said injection nozzle at any axial location from said tip to said upstream location includes solid land portion material extending radially and continuously inwardly from said boundary wall and enclosing said gas passage.
Dependencies are inferred from the claim text.