Patent ID: 7523595
Filing Date: 2009-04-28
Classification: B65B

Abstract:
1. A method for attaching a draw string to an infusion bag automatically, the method comprising the steps of: providing the infusion bag with two openings in a top part and two openings in a bottom part of the bag; providing a slider beneath and on one side of the bag, the slider having a width substantially equal to a lateral distance between the two top openings; providing two guide rollers between the bottom part of the bag and the slider, the two rollers being arranged laterally with respect to the bag, the guide rollers being located at a distance from each other such that the slider can pass between the two guide rollers; providing a continuous length of draw string between the guide rollers and the slider; cuffing the continuous draw string to a selected length; aligning the cut draw string in a U-shape on the one side of the bag at least to a height of the top openings by drawing the string with the slider and by passing between the guide rollers in the direction of the bag; inserting the draw string through the top openings to form a loop at each opening on a second side of the bag, wherein the top two loops are connected together by means of an intermediate string portion; forming another two loops in an area of the bottom part of the infusion bag; and drawing the bottom two loops through the top two loops to surround the bag with the draw string longitudinally in two laterally offset layers and forming draw sections.