a method and apparatus for packaging coiled nylon copolymer trimmer line comprises making the package of plastic material which is capable of melt bonding , either by the application of heat and pressure , radio frequency or by ultrasonic welding . the container comprises a backing sheet and a pre - formed bubble having an opening in it , with a flange extending outwardly around the opening . the flange is placed on the backing sheet ; and the two sheets are heat - melt bonded together by a suitable technique , to produce a strong , integral package which significantly resists separation of the flange from the backing sheet . after the package has been formed , nylon or nylon copolymer , or other plastic , trimmer line is wound into the package , and the bond between the flange and the backing sheet is greater than the compression spring force exerted by the wound trimmer line against the package , preventing separation of the package parts from one another .