Patent ID: 6349586
Filing Date: 2002-02-26
Classification: B21D,C21D,Y02P

Abstract:
A method for forming a neck in each of a plurality of container bodies including a first container body having a longitudinal extent, an open end and a region that extends a first container body distance downwardly from the open end along the longitudinal extent of the first container body, comprising:providing at least a first induction heating element; moving the plurality of container bodies including the first container body relative to said first induction heating element and heating at least the region of the first container body during said moving step, the first container body distance associated with the region being at least 0.2 inch, wherein during said moving step said first induction heating element is spaced above the open end of the first container body by a spatial distance that is in the range of no contact between said first induction heating element and the first container body to no greater than 1.5 inches, said heating step includes heating the region to a temperature of at least 525Â° F. while the temperature of the container body at a second container body distance of 0.5 inch is no greater than 400Â° F.; and necking at least the region of the first container body using a necking process; wherein the first container body is located below said first induction heating element for a desired time duration during said heating step, with said desired time duration depending on said spatial distance and power applied to said first induction heating element, said time duration depending on a speed of the first container body during said moving step and said speed being in the range of 3-50 mph.