Method of making an overmolded waterway connection
View Patent ↗A process for providing an overmolded waterway comprising inserting a shaft portion of a sacrificial core into an end of a tube, the shaft portion having a first opening therein, the sacrificial core having a second portion comprising a second opening and a contact surface about the second opening, the second opening in fluid communication with the first opening and the inside of the tube, in a mold cavity inserting a core pin transverse to the tube end, the sacrificial core contact surface engaging a mating surface of the core pin closing the second opening, injection overmolding over a portion of the tube end and core pin forming an overmolded waterway having an outlet portion in fluid communication with the second opening and the inside of the tube, and removing the core pin from the second opening through the outlet portion and removing the overmolded waterway from the mold cavity.
1. A process for providing an overmolded waterway comprising
providing a longitudinal tube having a tube inside dimension at a proximate end,
inserting a shaft portion of a sacrificial core into said end of the tube, the shaft portion having a first opening therein, the sacrificial core having a second tubular portion adjacent the end of the tube comprising a second opening, the second opening in fluid communication with the first opening and the inside of the tube,
positioning at least the end of the tube with the sacrificial core into a mold cavity having a desired shape,
positioning a core pin at least partially into the mold cavity with a portion of the core pin into the sacrificial core second opening closing the second opening,
injection overmolding a waterway over a portion of the tube end and core pin in the mold cavity, the overmolded waterway having an outlet portion in fluid communication with the second opening and the inside of the tube, and
removing the core pin from the second opening through the outlet portion and removing the overmolded waterway from the mold cavity.
2. The process of claim 1 , where the outlet portion is oriented between about 15° and 175° from the longitudinal direction of the tube.
3. The process of claim 1 , where the outlet portion is oriented about 90° from the longitudinal direction of the tube.
4. The process of claim 1 , where the shaft portion of the sacrificial core has an outer dimension smaller than the tube inside dimension.
5. The process of claim 1 , where the tube is elastic and the shaft portion of the sacrificial core has an outer dimension greater than the tube inside dimension.
6. The process of claim 1 , further comprising
crosslinking at least a portion of one or more components selected from a group consisting of the tube, the sacrificial core, the overmolded waterway, and a combination or two or more thereof by application of an electron beam.
7. The process of claim 6 , where the overmolded waterway is crosslinked, and the process further comprises
providing a fitting having a first fitting portion and a second fitting portion and a bore there through, the first fitting portion having an outermost dimension equal to or larger than a corresponding cross-sectional dimension of the outlet portion,
inserting the first fitting portion into the outlet portion enlarging the outlet portion.
8. The process of claim 7 , where the second fitting portion is selected from a group consisting of threaded fitting, hose barb, and quick connect fitting.
9. The process of claim 1 , where the outlet portion is oriented between about 30° and 70° from the longitudinal direction of the tube.
10. The process of claim 1 , where the outlet portion is oriented between about 120° and 160° from the longitudinal direction of the tube.
11. The process of claim 7 , the first fitting portion having a barb with an outermost dimension larger than the corresponding cross-sectional dimension of the outlet portion.