초록 ▼

An injection molding sealing apparatus configured to be installed in a coinjection hot runner with a coinjection nozzle, the coinjection nozzle having at least two melt channels ending at the same gate. The sealing apparatus is configured for sealing the coinjection hot runner to a hot runner sprue

An injection molding sealing apparatus configured to be installed in a coinjection hot runner with a coinjection nozzle, the coinjection nozzle having at least two melt channels ending at the same gate. The sealing apparatus is configured for sealing the coinjection hot runner to a hot runner sprue bushing, which is coupled to an injection assembly, during relative movement between (i) the coinjection hot runner and (ii) a stationary mold or machine section. Sealing structure is configured to seal the coinjection molding hot runner sprue bushing to the coinjection hot runner during the relative movement. Coupling structure is configured to provide relative movement between the injection assembly and the stationary mold or machine section.

대표청구항 ▼

What is claimed is: 1. An injection molding sealing apparatus configured to be installed in a coinjection hot runner with a coinjection nozzle, the coinjection nozzle having at least two melt channels ending at the same gate, said sealing apparatus being configured for sealing the coinjection hot r

What is claimed is: 1. An injection molding sealing apparatus configured to be installed in a coinjection hot runner with a coinjection nozzle, the coinjection nozzle having at least two melt channels ending at the same gate, said sealing apparatus being configured for sealing the coinjection hot runner to a coinjection molding hot runner sprue bushing, which is coupled to an injection assembly, during relative movement between (i) the coinjection hot runner and (ii) a stationary mold or machine section, said apparatus comprising: sealing structure configured to seal the coinjection molding hot runner sprue bushing to the coinjection hot runner during relative movement between the coinjection hot runner and the injection assembly; and coupling structure configured to provide relative movement between the injection assembly and the stationary mold or machine section. 2. Apparatus according to claim 1, wherein said coupling structure comprises (i) a piston configured to be coupled to one of the injection assembly and the stationary mold or machine section, and (ii) a cylinder configured to be coupled to the other one of the injection assembly and the stationary mold or machine section. 3. Apparatus according to claim 1, wherein the coinjection hot runner is movable and the stationary mold or machine section comprises a stationary platen, and wherein said coupling structure is coupled to the injection assembly and the stationary platen. 4. Apparatus according to claim 3, further comprising structure configured to couple a second injection assembly to the movable coinjection hot runner such that the second injection assembly and the injection assembly move together with the coinjection hot runner. 5. An injection molding sealing apparatus configured to be installed in a coinjection hot runner with a coinjection nozzle, the coinjection nozzle having at least two melt channels ending at the same gate, said sealing apparatus being configured for sealing the coinjection hot runner to a coinjection molding hot runner sprue bushing, which is coupled to an injection assembly, during relative movement between (i) the coinjection hot runner and (ii) a stationary mold or machine section, said apparatus comprising: sealing structure configured to seal the coinjection molding hot runner sprue bushing to the coinjection hot runner during the relative movement; coupling structure configured to provide relative movement between the injection assembly and the stationary mold or machine section; the coinjection molding hot runner sprue bushing; and an injection assembly spigot nozzle slidably coupled to said coinjection molding hot runner sprue bushing, said injection assembly spigot nozzle being configured to provide relative movement between the injection assembly and said coinjection molding hot runner sprue bushing. 6. An injection molding sealing apparatus configured to be installed in a coinjection hot runner with a coinjection nozzle, the coinjection nozzle having at least two melt channels ending at the same gate, said sealing apparatus being configured for sealing the coinjection hot runner to a coinjection molding hot runner sprue bushing, which is coupled to an injection assembly, during relative movement between (i) the coinjection hot runner and (ii) a stationary mold or machine section, said apparatus comprising: sealing structure configured to seal the coinjection molding hot runner sprue bushing to the coinjection hot runner during the relative movement; coupling structure configured to provide relative movement between the injection assembly and the stationary mold or machine section; a shooting pot configured to (i) be coupled to the movable coinjection hot runner, and (ii) hold less than a full shot of melt to be injected through the coinjection nozzle; and a shooting pot piston coupled to said shooting pot and configured to inject the melt in said shooting pot through the coinjection nozzle upon the relative movement between the movable coinjection hot runner and the stationary mold or machine section; said shooting pot and said shooting pot piston, in combination, being configured to inject a full shot of melt through the coinjection nozzle upon the relative movement between (i) the coinjection hot runner and (ii) a stationary mold or machine section. 7. An injection molding sealing apparatus configured to be installed in a coinjection hot runner with a coinjection nozzle, the coinjection nozzle having at least two melt channels ending at the same gate, said sealing apparatus being configured to seal (i) the coinjection hot runner, which is relatively movable with respect to a relatively stationary platen, and (ii) a hot runner sprue bushing, said apparatus comprising: a shooting pot configured to be coupled to the coinjection hot runner; a shooting pot piston configured to discharge melt from said shooting pot upon relative movement of the coinjection hot runner and said platen; the hot runner sprue bushing configured to be fixedly coupled to the coinjection hot runner; an injection unit coupled to said hot runner sprue bushing; and coupling structure configured to couple said injection unit to said platen so that said injection unit is relatively movable with respect to said platen. 8. Apparatus according to claim 7, wherein said coupling structure comprises (i) a piston coupled to said relatively stationary platen, and (ii) a cylinder coupled to said injection unit. 9. Apparatus according to claim 7, wherein the coinjection hot runner is fixedly coupled to a mold cavity plate, and further comprising the coinjection nozzle configured to be coupled to the coinjection hot runner and to inject melt discharged from said shooting pot into a mold cavity in the cavity plate. 10. Apparatus according to claim 7, wherein said injection unit is configured to (i) inject melt through said hot runner sprue bushing into said shooting pot, and (ii) cause the melt injection to move said coinjection hot runner relatively away from the relatively stationary platen. 11. Apparatus according to claim 10, further comprising drive structure configured to move the coinjection hot runner relatively toward the relatively stationary platen, this relative toward movement causing said shooting pot piston to discharge the melt from said shooting pot. 12. Apparatus according to claim 7, further comprising: a second shooting pot configured to be coupled to a second coinjection hot runner, which is relatively movable with respect to the relatively stationary platen; a second shooting pot piston configured to discharge a second melt from said second shooting pot; a second hot runner sprue bushing configured to be fixedly coupled to the second coinjection hot runner; and a second injection unit coupled to said second hot runner sprue bushing. 13. Apparatus according to claim 12, wherein the second coinjection hot runner is coupled to the coinjection hot runner. 14. Apparatus according to claim 13, wherein a mold cavity plate is coupled to the second coinjection hot runner and to the coinjection hot runner, and wherein a mold core plate is disposed to be movable with respect to the mold cavity plate, and wherein said second shooting pot is configured to be disposed in the mold cavity plate, and wherein said second shooting pot piston is disposed parallel to said coinjection nozzle and is configured to extend from the mold cavity plate through the mold core plate. 15. Apparatus according to claim 14, wherein relative movement of the coinjection hot runner toward the platen causes said shooting pot piston to discharge melt from said shooting pot, and wherein injection of melt from said injection unit through said hot runner sprue bushing into said shooting pot causes relative movement of the coinjection hot runner away from the platen. 16. Apparatus according to claim 7, further comprising a slidable coupling connecting said injection unit to said hot runner sprue bushing, and wherein relative movement of said coinjection hot runner toward said platen causes (i) said shooting pot piston to discharge melt from said shooting pot, and (ii) melt in said slidable coupling to be discharged toward said coinjection hot runner. 17. Apparatus according to claim 16, wherein said shooting pot is configured to hold less than a full shot of melt. 18. An injection molding apparatus configured to be installed in a coinjection hot runner with a coinjection nozzle, the coinjection nozzle having at least two melt channels ending at the same gate, said apparatus comprising: a shooting pot configured to hold less than a full injection shot of melt; a hot runner manifold configured to be in fluid communication with said shooting pot and the coinjection nozzle; a sprue bushing configured to provide melt to said hot runner manifold; an injection unit configured to provide melt to said sprue bushing; and a slidable melt coupling configured to slidably couple said injection unit to said sprue bushing so that relative movement of said injection unit with respect to said sprue bushing causes melt in said slidable melt coupling to move toward said melt manifold, said shooting pot and said slidable melt coupling being configured to hold a full injection shot of melt. 19. An injection molding sealing apparatus configured to be installed in a coinjection hot runner with a coinjection nozzle, the coinjection nozzle having at least two melt channels ending at the same gate, said apparatus comprising: a sprue bushing configured to be fixedly coupled to a hot runner manifold so as to maintain a seal therebetween throughout a relative movement between the hot runner manifold and an injection unit; and the injection unit being configured to be movably coupled to a platen and fixedly coupled to said sprue bushing. 20. An injection molding sealing apparatus configured to be installed in a coinjection hot runner with a coinjection nozzle, the coinjection nozzle having at least two melt channels ending at the same gate, said apparatus comprising: means for injecting a melt from an injection unit, which is coupled to a stationary platen, through a sprue bushing, into a hot runner manifold, and into a shooting pot, said means for injecting causing the hot runner manifold and the platen to move away from each other; means for sealing the sprue bushing to the hot runner manifold throughout the movement away; means for causing the hot runner manifold and the platen to move toward each other, the movement toward causing the melt in the shooting pot to be discharged toward the coinjection nozzle, the means for sealing sealing the sprue bushing to the hot runner manifold throughout the movement toward.