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During the filling/packing stage of injection molding machine, the clamp can be opened slightly. This also helps reduce molding stress. Most press manufacturers that can precisely control the movement of the fixture can add this option to the charging control.
Any standard injection molding machine can capable of doing this ,we can do a multi-stage platen closing, i.e. close to first position , inject full volume of material, close platen to final position. Most new machines with good controllers are capable of this. What's more important is the injection mold design. You have to use a shear edge tool, and injection locations should either be a center top gate, or multiple hot drops away from the edges. Eliminate free-standing cores if possible too. This process really only works well for large thin parts that do not have a lot of projections from the nominal wall.
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