Injection nozzle and method for injection molding
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Referring to the drawings which show a preferred embodiment of the nozzle assembly of the present invention, FIGS. 1-3 show the nozzle assembly in each of three valve stem positions. FIG. 1 shows injection nozzle 10 including nozzle housing 12 and nozzle tip 14 secured thereto. The injection nozzle is located in mold manifold plate 16 and supporting manifold 18. Mounted in manifold 18 is valve bushing 20 that contains two pneumatic pistons 22, 24 to which is attached valve stem 26.
Melt channel 28 in manifold 18 is connected to central melt channel 30 in nozzle housing 12 which in turn leads to injection orifice or gate orifice 32 in gate pad 34. Insulator 36 occupies the space between nozzle tip 14 and gate pad 34 and also contains a melt channel opening 38 therein. When the valve stem 26 is in the fully retracted position as shown in FIG. 1 resin can be injected through the melt channels to fill mold cavity 40 in a known fashion. This mold cavity has a gate nub 42 so that when the...
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