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AssigneePrimtec
InventorJens O. Sorensen
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A system and method of controlling hold pressure applied to molding cavities of a stacked multi-parting injection molding system having desynchronized injection periods while cyclic injection molding a plastic material. A combination of the center molding block and an injection system together provide an adjustable feed system. The feed system is adjusted to enable plastic material to be fed from the injection system through a left branch to the left molding cavity. The injection system is pressurized to inject the plastic material through the left branch to fill the left molding cavity. The injected plastic material is confined within the left branch and the left molding cavity; and the confined plastic material is hold pressurized by a movable packing element. A like sequence of steps is followed to hold pressurize the right molding cavity. When the molding cavities have desynchronous opening periods, the closed molding cavity is locked to maintain it in a closed position while the other molding cavity is open; and axial clamping force is applied to the locked molding cavity by expanding the thickness of at least one of the molding blocks that defines the locked molding cavity.
A method of controlling hold pressure applied to molding cavities of a stacked multi-parting injection molding system having desynchronized injection periods, including left, center and right molding blocks disposed for movement with respect to each other along a common axis and defining a left molding cavity between the center and left molding blocks and a right molding cavity between the center and right molding blocks, when cyclic injection molding a plastic material by utilizing a combination of the center block and an injection system which together encompass an adjustable feed system that is separated during the molding cycle by the injection system being separated from the center block, the feed system having within the center block a left branch for feeding the left molding cavity, a right branch for feeding the right molding cavity, and means for confining injected plastic material in the respective branches and molding cavities, the method comprising the cyclic steps of
A method of controlling hold pressure applied to mold cavities of a stacked multi-parting injection molding system having desynchronized injection periods, including a left, center and right molding blocks disposed for movement with respect to each other along a common axis and defining a left molding cavity between the center and left molding blocks and a right molding cavity between the center and right molding blocks, when cyclic injection molding a plastic material by utilizing a combination of the center block and an injection system which together encompass an adjustable feed system having within the center block a left branch for feeding the left molding cavity, a right branch for feeding the right molding cavity, and means for confining injected plastic material in the respective branches and molding cavities, the method comprising the cyclic steps of
A method of applying hold pressure in a stacked multi-parting injection molding system that includes a center block and left and right end blocks disposed for movement with respect to each other along a common axis and defining a left molding cavity between the center and left blocks and a right molding cavity between the center block and right blocks, when cyclic injection molding a plastic material by utilizing an adjustable feed system that includes a runner stem for receiving injected plastic material from a pressurized injection system, a left branch for feeding the injected plastic material from the runner stem to the left molding cavity and a right branch for feeding the injected plastic material from the runner stem to the right molding cavity;
A method of controlling hold pressure applied to molding cavities of a stacked multi-parting injection molding system having desynchronized injection periods, including left, center and right molding blocks disposed for movement with respect to each other along a common axis and defining a left molding cavity between the center and left molding blocks and a right molding cavity between the center and right molding blocks, when cyclic injection molding a plastic material by utilizing a combination of the center block and an injection system which together encompass an adjustable feed system having within the center block a left branch for feeding the left molding cavity, a right branch for feeding the right molding cavity, and means for confining injected plastic material in the respective branches and molding cavities, wherein the molding cavities have desynchronous opening periods, the method comprising the cyclic steps of
An apparatus for controlling hold pressure applied to molding cavities of a stacked multi-parting injection molding system having desynchronized injection periods, including left, center and right molding blocks disposed for movement with respect to each other along a common axis and defining a left molding cavity between the center and left molding blocks and a right molding cavity between the center and right molding blocks, when cyclic injection molding a plastic material by utilizing a combination of the center block and an injection system which together encompass an adjustable feed system that is separated during the molding cycle by the injection system being separated from the center block, the feed system having within the center block a left branch for feeding the left molding cavity, a right branch for feeding the right molding cavity, and means for confining injected plastic material in the respective branches and molding cavities, the apparatus comprising
An apparatus for controlling hold pressure applied to molding cavities of a stacked multi-parting injection molding system having desynchronized injection periods, including left, center and right molding blocks disposed for movement with respect to each other along a common axis and defining a left molding cavity between the center and left molding blocks and a right molding cavity between the center and right molding blocks, when cyclic injection molding a plastic material by utilizing a combination of the center block and an injection system which together encompass an adjustable feed system having within the center block a left branch for feeding the left molding cavity, a right branch for feeding the right molding cavity, and means for confining injected plastic material in the respective branches and molding cavities, the apparatus comprising
An apparatus for applying hold pressure in a stacked multi-parting injection molding system that includes a center block and left and right end blocks disposed for movement with respect to each other along a common axis and defining a left molding cavity between the center and left blocks and a right molding cavity between the center and right blocks, when cyclic injection molding a plastic material by utilizing an adjustable feed system that includes a runner stem for receiving injected plastic material from a pressurized injection system, a left branch for feeding the injected plastic material from the runner stem to the left molding cavity and a right branch for feeding the injected plastic material from the runner stem to the right molding cavity;
An apparatus for controlling hold pressure applied to molding cavities of a stacked multi-parting injection molding system having desynchronized injection periods, including left, center and right molding blocks disposed for movement with respect to each other along a common axis and defining a left molding cavity between the center and left molding blocks and a right molding cavity between the center and right molding blocks, when cyclic injection molding a plastic material by utilizing a combination of the center block ad an injection system which together encompass an adjustable feed system having within the center block a left branch for feeding the left molding cavity, a right branch for feeding the right molding cavity, and means for confining injected plastic material in the respective branches and molding cavities, wherein the molding cavities have desynchronous opening periods the apparatus comprising
Dependencies are inferred from the claim text.