Method for forming a metal container with a carrier ring and resulting container
Disclosed is a method for retaining an outsert on a neck. The method includes providing a neck with a sidewall for a metal body. The method further includes forming an outward curl in the metal sidewall. The method further includes sliding a plastic outsert down onto the neck. The plastic outsert has a first inner diameter at a first end that is smaller than a diameter of the neck encompassing the outward curl. The outward curl is configured to flex as the plastic outsert slides down onto the neck to accommodate the first end of the plastic outsert passing over the outward curl. The method further includes retaining the plastic outsert on the neck between a first interference fit at a first interface of the metal sidewall and the plastic outsert and at a second interference fit between a top edge of the plastic outsert and the outward curl.
1 . A method comprising:
providing a neck for a metal body, the neck being formed of a metal sidewall;
forming an outward curl in the metal sidewall at a first end of the neck;
sliding a plastic outsert down onto the neck from the first end of the neck, the plastic outsert having a first inner diameter at a first end that is smaller than a diameter of the neck encompassing the outward curl, the outward curl flexing as the plastic outsert slides down onto the neck to accommodate the first end of the plastic outsert passing over the outward curl; and
retaining the plastic outsert on the neck between a first interference fit at a first interface of the metal sidewall and the plastic outsert and at a second interference fit between a top edge of the plastic outsert at the first end of the plastic outsert and the outward curl.
2 . The method of claim 1 , wherein the forming the outward curl leaves a gap between a tip of the outward curl and the metal sidewall of the neck.
3 . The method of claim 2 , wherein the gap provides clearance for the outward curl to flex to accommodate the first end of the plastic outsert passing over the outward curl as the plastic outsert slides onto the neck.
4 . The method of claim 2 , wherein the gap varies in distance between the tip of the outward curl and the metal sidewall across a thickness of the tip of the outward curl.
5 . The method of claim 1 , wherein the outward curl has a substantially circular profile.
6 . The method of claim 1 , wherein the plastic outsert comprises a plastic sidewall with a thread that extends from and wraps around the plastic sidewall.
7 . The method of claim 6 , wherein a distance the outward curl extends from the metal sidewall of the neck is substantially equal to a thickness of the plastic sidewall of the plastic outsert.
8 . The method of claim 6 , wherein the plastic outsert comprises a carrier ring that wraps around the plastic sidewall below the thread.
9 . The method of claim 8 , wherein the retaining the plastic outsert on the neck results in a clearance between the metal sidewall of the neck and the first end of the plastic outsert.
10 . The method of claim 1 , wherein the plastic outsert has a second inner diameter at a second end, opposite the first end, that is smaller than the diameter of the neck encompassing the outward curl.
11 . The method of claim 1 , further comprising treating the plastic outsert with heat to reduce permanent deformation of the plastic outsert during the sliding the plastic outsert onto the neck.
12 . The method of claim 11 , wherein the internal temperature of the plastic outsert is raised to about 60° F. to about 140° F. during the treating the plastic outsert with heat.