Patent ID: 6637175
Filing Date: 2003-10-28
Classification: B65B

Abstract:
A method for wrapping filter bags for products for infusion in individual sealed outer envelopes, the filter bags comprising at least one chamber containing a charge of product, and a string connected at one end to the chamber, while the other end of the string is connected to a pick-up tag, the method comprising the following steps:feeding a succession of single, plane sheets to a station for wrapping each sheet over a corresponding filter bag; folding each sheet into a U-shape about a transversal axis of said each sheet around the filter bag so as to form at least two opposite wings between which the filter bag is placed; and joining at least longitudinal edges of said each sheet that is folded into a U shape to form a sealed outer envelope around the filter bag, wherein after the step of folding the sheet, the method further comprises a step of aligning the longitudinal edges with each other by simultaneously rolling the longitudinal edges.