Method of using a sequential fill valve gated injection molding

Details Method of using a sequential fill valve gated injection molding Method of using a sequential fill valve gated injection molding

1996-04-29

1998-06-09

Heitbrink, Tim

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

26432813, 425145, 425564, 425566, 425573, B29C 4518

Patent

active

057628556

ABSTRACT:
A system for injection molding of large components is disclosed that provides for the production of higher quality large molded components with a reduction in both molding cycle time and molding costs. Plasticized material communicates with a mold, having at least one single cavity, through a manifold that has at least two spaced valve gates that are independently opened and closed as directed by a controller to selectively communicate plasticized material to the mold cavity at separate locations in the mold cavity. The controller directs the valve gates to sequentially open and close during the filling phase so as to achieve the desired melt front advancement within the mold cavity. Once the mold cavity has been filled as desired, the valve gates are closed to effectively seal the manifold from the mold cavity. The plasticized material within the manifold is held in compression while the mold cavity is open, so as to prevent appreciable expansion of the material that has been found to result in molded part imperfections. Additional material may be plasticized and held in compression while the mold cavity is open, resulting in a further reduction in overall cycle time.

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Kona Corporation Promotional Material; "A Sequential Valve Gate Success," Konanews, pp. 2-3, vol. 7, No. 2, Jun. 1995.
Joseph Orgando, "Sequential Valve Gating Aids Filling of Large Parts," Plastics Technology, pp. 17, 19 and 21, May 1995.
James Betters and John Duffy, "The Benefits of Sequential Fill Valve Gate Hot Runner Systems for Molding Automotive Bumper Fascias, " Society of Plastics Engineers, Detroit Section and Automotive Division RETEC, pp. 173-181, Nov. 8 and 9, 1995.

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