Patent ID: 6426030
Filing Date: 2002-07-30
Classification: B29C,B29L,Y10S

Abstract:
A method of making a closure for a container comprising:inserting a preselected amount of a formable plastic material into a mold cavity of a mold having a selected first diameter, said mold cavity having longitudinally extending ribs along an inner wall of said cavity; moving a linearly and rotatably moveable threaded core element into said cavity, said core element having a second diameter less than said first diameter defining a spacing therebetween thereby forcing said plastic material into said spacing defined between said inner walls of said cavity and said core element thereby forming a closure having internal threads; and, non-rotatably backing said core element out of said cavity and rotating said core element at a preselected time during said backing out, said backing out including stopping rotation of said core element as said closure is separated from said cavity so that said closure is engaged with the terminating end of said threads on said core when said closure is completely backed out of said cavity.