Abstract: Extruding tubular bag material having interlocking profiles thereon and guiding the profiles together flattening the tube and interlocking the profiles.

Abstract: .Iadd.A reclosable plastic bag having interlocking rib and groove elements integral with the plastic of the bag formed with an arrowhead shaped rib. The rib and groove are structurally interrelated in different forms so that the bag opens easily from the outside and resists opening from the inside..Iaddend.

Abstract: .Iadd.A method and apparatus for continuously extruding a closed plastic tube with complementary releasably interlocking shaped rib and groove elements on the inner surface of the tube material and extending therealong with the plastic tubing being cooled closely following the extruding and thereafter while advancing the tube from the extruder forcing together the rib and groove elements into an interlocking position, the tubing being then passed through delivery rolls which operate at a predetermined speed, bags being cut from the tubing and heat sealed, and the bags being fed onto a conveyor belt whose rate of delivery is greater than that of the delivery rolls, with the cut edges of the bags being then pressed between a pressure plate and conveyor belt..Iaddend.

Abstract: .Iadd.A method and apparatus for manufacturing a tube to be used for forming plastic reclosable bags including means for extruding a continuous annular tube of plastic with circumferentially spaced axially extending interlocking rib and groove profiles on the surface from a die shaped to form the tube and profiles, means for delivering tube separating air through the die into the tube interior, means for delivering a flow of outside cooling air around the outer surface of the tube to cool the tube at a rate to maintain the profiles on the surface of the tube and drawing means positioned for receicing the tube and drawing it from the die and flattening it. .Iaddend.

Abstract: .Iadd.An elongate closed flexible integral plastic film tube for use in making reclosable bags with the tube having first and second interlocking rib elements and first and second groove elements on the surface thereof each shaped for cooperative pressure engagement and forcible separation between the ribs and grooves with the elements spaced apart from each other in both circumferential directions and the film at one side of the elements for forming the body of a bag formed from the tube and the film at the other side of the elements providing a flange forming portion. The elements are spaced so that the bag portion is wider than the flange portion. .Iaddend.