Stringing preventing member and injection molding apparatus
AssigneeFujinon Corporation
InventorTakeshi Sakaki
Life of this patent
Estimating the term…
Abstract
A stringing preventing member is provided and includes: a member having an opening portion through which resin injected from an injection nozzle of an injection molding apparatus is fed to a mold including a fixed mold and a movable mold; and a projection portion protruding inwardly with respect to an opening of the injection nozzle, so as to define at least a part of a contour of the opening portion. A ratio of an effective opening area of the opening portion to a surface area of an inner wall surface of the opening portion contacting with the resin at an inside of the opening potion is 0.6 or less, and a ratio of the effective opening area of the opening portion to an area of the opening of the injection nozzle is 0.6 or more.
Claims15
A stringing preventing member comprising:
- a member having an opening portion through which resin injected from an injection nozzle of an injection molding apparatus is fed to a mold including a fixed mold and a movable mold;
- and
- a projection portion protruding inwardly with respect to an opening of the injection nozzle, so as to define at least a part of a contour of the opening portion,
- wherein a ratio of an effective opening area of the opening portion to a surface area of an inner wall surface of the opening portion contacting with the resin at an inside of the opening portion is 0.6 or less, and
- a ratio of the effective opening area of the opening portion to an area of the opening of the injection nozzle is 0.6 or more.
An injection molding apparatus comprising:
- an injection nozzle for injecting resin;
- a mold including a fixed mold and a movable mold, the movable mold being movable with respect to the fixed mold and having a cavity for molding an article between the fixed mold and the movable mold;
- and
- a stringing preventing member having an opening portion through which the resin is fed to the mold, the stringing preventing member including a projection portion protruding inwardly with respect to an opening of the injection nozzle, so as to define at least a part of a contour of the opening portion,
- wherein a ratio of an effective opening area of the opening portion to a surface area of an inner wall surface of the opening portion contacting with the resin at an inside of the opening portion is 0.6 or less, and
- a ratio of the effective opening area of the opening portion to an area of the opening of the injection nozzle is 0.6 or more.
Dependencies are inferred from the claim text.