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US 2014/0151931 A1Published application
Injection molding method
AssigneeThe Procter & Gamble Company
InventorsGene Michael ALTONEN, John Moncrief LAYMAN, David Andrew DALTON, Kevin HEDSPETH
Life of this patent
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Abstract
A process for forming a product by injection molding.
Claims20
A process for forming a product, said process comprising the steps of:
- injecting molten polymer-based resin having a melt flow index less than or equal to about 1000 grams/10 minutes into a mold having cavity at an average rate greater than or equal to about 300 cubic centimeters per second as measured at a gate position of said product to form said product, wherein when said polymer-based resin is introduced into said cavity said polymer-based resin is compressed to about a maximum compressive capacity of said polymer-based resin based on said polymer-based resin's pressure-volume-temperature properties and said polymer-based resin decompresses in a liquid state while inside said cavity, wherein said product has a part density within about 3% of an inherent density of said polymer-based resin;
- wherein said product comprises:
- a body portion formed of said polymer-based resin, said body portion comprises:
- said gate position;
- a last fill position;
- a flow length to wall thickness ratio greater than or equal to about 200, wherein said flow length is measured from said gate position to said last fill position;
- and
- a wall thickness less than or equal to about 1 millimeter.
5 more elements
A process for forming a product, said process comprising the steps of:
- injecting molten polymer-based resin into a mold having cavity at an average rate greater than or equal to about 300 cubic centimeters per second as measured at a gate position of said product to form said product;
- wherein said product comprises:
- a body portion formed of a polymer-based resin, said body portion comprises:
- said gate position;
- a last fill position;
- a flow length to wall thickness ratio greater than or equal to about 200, wherein said flow length is measured from said gate position to said last fill position;
- and
- a wall thickness less than or equal to about 1 millimeter;
- wherein said polymer-based resin has a melt flow index less than or equal to about 1000 grams/10 minutes.
6 more elements
Dependencies are inferred from the claim text.