Method for using a sprue to reduce the size of a core layer hole in an injection molding process by terminating an injection stream within the sprue
AssigneeKortec, Inc.
InventorJohn Kermet
Life of this patent
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Abstract
A method and apparatus for extruding plastic articles, the method comprising the steps of injecting at least one stream of plastic material into a mold, the mold including a first portion and a second portion, the first portion of said mold being used for forming at least one article, and the second portion of said article forming a sprue attached to the at least one article, and, terminating the at least one stream of plastic material in the second portion.
Claims19
A method for extruding plastic articles comprising the steps of:
- injecting at least one stream of plastic material into a mold, said mold including a first portion and a second portion, said first portion of said mold being used for forming at least one article, and said second portion of said mold forming a sprue attached to the at least one article;
- and
- terminating the at least one stream of plastic material in said second portion of the mold,
- wherein the at least one stream of plastic material comprises at least two streams of plastic material, including an interior stream and an outer covering stream which surrounds the interior stream, and
- wherein the step of terminating comprises terminating interior stream in said second portion of the mold.
A method for extruding plastic articles comprising the steps of:
- injecting at least one stream of plastic material into a mold, said mold including a first portion and a second portion, said first portion of said mold being used for forming at least one article, and said second portion of said mold forming a sprue attached to the at least one article;
- terminating the at least one stream of plastic material in said second portion of the mold;
- separating the first portion of the mold from the second portion of the mold;
- and,
- separating the second portion of the mold from the source of the at least one stream of plastic material.
A method for extruding plastic articles comprising the steps of:
- injecting at least one stream of plastic material into a mold, said mold including a first portion and a second portion, said first portion of said mold being used for forming at least one article, and said second portion of said mold forming a sprue attached to the at least one article;
- and
- terminating the at least one stream of plastic material in said second portion of the mold,
- wherein said at least one stream of plastic material comprises at least one annular stream of plastic material, and
- wherein the step of terminating further comprises terminating the at least one annular stream of plastic material in said second portion of the mold so that an inner diameter of the at least one annular stream of plastic material is less than a diameter of a gate which injects the at least one annular stream of plastic material.
A method for co-extruding plastic articles comprising the steps of:
- injecting at least one annular stream of plastic material into a mold, said mold including a first portion and a second portion, said first portion of said mold being used for forming at least one article, and said second portion of said article forming a sprue attached to the at least one article;
- and
- terminating the at least one annular stream of plastic material in said second portion of the mold so that an inner diameter of the at least one annular stream is less than a diameter of a gate which injects the at least one annular stream of plastic material.
Dependencies are inferred from the claim text.