초록 ▼

Injection molding apparatus including a first mold cavity having an inlet, a second mold cavity having an inlet, a source of a first material to be injected, a source of a second material to be injected, and a co-injection manifold including a nozzle housing including a first outlet adapted to commu

Injection molding apparatus including a first mold cavity having an inlet, a second mold cavity having an inlet, a source of a first material to be injected, a source of a second material to be injected, and a co-injection manifold including a nozzle housing including a first outlet adapted to communicate with the first mold cavity inlet, a second outlet adapted to communicate with the second mold cavity inlet, first and second spaced apart inlets respectively adapted to communicate with the first and second sources of material to be injected, a first passageway communicating between the first inlet and the first and second outlets, and a second passageway communicating between the second inlet and the first and second outlets.

대표청구항 ▼

[ We claim:] [1.] A method of co-injection molding, the method comprising the steps of(a) providing first and second mold cavities having respective inlets,(b) providing first and second first and second sources of material to be injected,(c) providing a co-injection manifold comprising a nozzle hou

[ We claim:] [1.] A method of co-injection molding, the method comprising the steps of(a) providing first and second mold cavities having respective inlets,(b) providing first and second first and second sources of material to be injected,(c) providing a co-injection manifold comprising a nozzle housing including a first outlet communicating with the first mold cavity inlet, a second outlet communicating with the second mold cavity inlet, first and second spaced apart inlets respectively communicating with the first and second sources of material to be injected, a first passageway communicating between the first inlet and the first and second outlets, and a second passageway communicating between the second inlet and the first and second outlets,(d) controlling the flow of the first and second materials through the first outlet and into the first mold cavity, and(e) controlling, independently of step (d), the flow of the first and second materials through the second outlet and into the second mold cavity. [5.] A co-injection manifold comprisinga nozzle housing having forward and rearward ends, the nozzle housing including a nozzle housing outlet which is located adjacent the forward end, first and second spaced apart inlets which are located adjacent the rearward end and which are respectively adapted to communicate with first and second injection nozzles, an inner surface defining a bore having a rearward upstream end and having a forward downstream end communicating with the outlet, a first passageway communicating between the first inlet and the upstream end of the bore, and a second passageway communicating between the second inlet and the bore at a point intermediate the upstream and downstream ends of the bore, the first and second passageways each having therein no turns with an angle greater than forty degrees and each intersecting the bore at an angle of no more than forty degrees,a nozzle member housed in the bore, the nozzle member having a forward end which is spaced rearwardly from the nozzle housing outlet and which has therein an outlet port, the nozzle member having therein a central bore communicating between the first passageway and the nozzle member outlet port, and the nozzle member having an outer surface portion spaced from the inner surface of the nozzle housing so as to define a passageway communicating between the second passageway and the nozzle housing outlet, anda valve pin extending through the central bore and being moveable between a forward position wherein the valve pin extends into and closes both the nozzle member outlet port and the nozzle housing outlet, an intermediate position wherein the valve pin is spaced from the nozzle housing outlet and extends into and closes the nozzle member outlet port, and a rearward position wherein the valve pin is spaced from both the nozzle housing outlet and the nozzle member outlet port.