Patent ID: 8123885
Filing Date: 2012-02-28
Classification: B65D,Y10T

Abstract:
1. A method of making a flexible cover, comprising: (a) providing a forming mandrel with a top surface and a sidewall depending therefrom; (b) providing a sealing bar having a top and spaced apart from said sidewall; (c) providing a forming die having a cavity defined by a sidewall, said cavity being sized so that it can telescope over said forming mandrel; (d) stretching an elastic band around said forming die; (e) placing a sheet of film across said top surface of said forming mandrel so that the sides of said sheet extend past the sides of said forming mandrel with the free edges of said sheet being positioned above a portion of said sealing bar; (f) telescoping said die over said forming mandrel; (g) moving said elastic band from said forming die and around said forming mandrel, thereby holding the sides of said sheet against said sidewall sides of said mandrel with the free edges of said sheet flaring outward past said elastic band and resting along said top of said sealing bar; (h) closing the space between said sealing bar and said mandrel so that the free edges of said sheet are bent upward and against said sidewall of said mandrel to form a hem around said elastic band; and (i) sealing said hem through the application of heat and pressure to enclose said elastic band around the perimeter of said sheet to form a flexible cover.