A method for manufacturing a drip irrigation emitter, including the steps of molding onto an injection-mold core having at least n different active diameters, n different, axially spaced apart members of the emitter, at least n-1 of the members being substantially annular, the inside diameter of at
A method for manufacturing a drip irrigation emitter, including the steps of molding onto an injection-mold core having at least n different active diameters, n different, axially spaced apart members of the emitter, at least n-1 of the members being substantially annular, the inside diameter of at least one of the annular members being a tight fit on the outside diameter of the next smaller of the members, stripping the members off the core, starting from the member having the largest inside diameter, thereby causing the members to be tightly nested one inside the other, in a predetermined axial and angular relationship, and ejecting the thus fully assembled emitter from the mold. There is also provided an injection mold for producing fully assembled multi-part drip-irrigation emitters.
대표청구항▼
A method for manufacturing a drip irrigation emitter using an injection mold including a stationary and a movable platen, a sprue bushing, a plurality of sprue gates, and a stripper plate, said method comprising the steps of: a) molding onto a main injection-mold core having three different active d
A method for manufacturing a drip irrigation emitter using an injection mold including a stationary and a movable platen, a sprue bushing, a plurality of sprue gates, and a stripper plate, said method comprising the steps of: a) molding onto a main injection-mold core having three different active diameters, three different, axially spaced apart members of said emitter, at least two of said members being substantially annular, the inside diameter of at least one of said annular members being a tight fit on the outside diameter of the next smaller of said members; b) retracting the movable platen of said mold thereby extracting the sprue from said sprue bushing; c) removing a first, axial, needle-shaped, core from the smallest of said emitter members and opening a split cavity that determines the outside configuration of said emitter members thereby also withdrawing second and third, lateral, needle-shaped cores; d) advancing the stripper plate of said mold thereby stripping the largest of said emitter members from that portion of said main injection-mold core that has the largest of said active diameters, and subsequently initiating a process of mutually telescoping said emitter members while temporarily retaining said smallest member against movement in response to the advance of the stripper plate whereby, in the course of said process, said sprue gates are severed from said members in an axial direction and at the end of said process, said members have been assembled into an emitter wherein said members are tightly nested one inside the other and frictionally held in a predetermined axial and angular relationship that establishes an uninterrupted flow path for proper functioning of said emitter; and e) ejecting said emitter from said mold.
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