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US 9,815,233 B2Granted
Method and apparatus for substantially constant pressure injection molding of thinwall parts
AssigneeImflux Inc.
InventorsGene Michael Altonen, Michael Thomas Dodd, Natalia Maria Ramon Martinez, Kimberly Nichole McConnell, Danny David Lumpkin, Vincent Sean Breidenbach, John Russell Lawson
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Abstract
A substantially constant pressure injection molding method and machine that forms molded parts by injecting molten thermoplastic material into a mold cavity at a substantially constant pressure. As a result, the mold cavity is filled with molten thermoplastic material by advancing a continuous flow front of thermoplastic material from a gate to an end of the mold cavity.
Claims13
A method of injection molding a thinwall part at a substantially constant pressure, the method comprising:
- providing an injection molding machine having an injection system and a mold with a mold cavity having a L/T ratio of more than 100;
- operating the injection system to advance a shot of a molten thermoplastic material into the mold cavity such that a flow rate of the injection system increases until a predetermined injection pressure is reached;
- and
- adjusting a filling pressure profile to cause the flow rate of the injection system to peak within a first 30% of the mold cavity being filled;
- and
- reducing the flow rate of the injection system to maintain a substantially constant injection pressure from when the predetermined injection pressure is reached until the mold cavity is at least substantially filled with thermoplastic material.
3 more elements
Dependencies are inferred from the claim text.