Patent ID: 9221227
Filing Date: 2015-12-29
Classification: B31B,B65B,B65H

Abstract:
1. A method for producing bags containing fiber material, comprising: forming portions of fiber material and moving them along a predetermined path; feeding each portion of fiber material into respective containment bags; and moving in succession the bags housing respective portions of fiber material to a folding unit at which the bags are closed; wherein an ordered succession of bags for containing respective portions of fiber material is obtained from a web unwound continuously from a reel and fed, in order, to a folding section, to a sealing device and to a cutting station; a first temporary accumulation device of a portion of the web being provided for allowing the transit with intermittent motion of the web to the sealing device, and a second temporary accumulation device of a portion of the web being provided between the sealing device and the cutting station for allowing the transit with continuous motion of the web through the cutting station, wherein each of the first and second temporary accumulation devices comprises a pneumatic buffer through which the web sasses, each pneumatic buffer comprising a box-shaped element through which a loop of the web passes, an interior of each pneumatic buffer maintained at a pressure below atmospheric pressure to allow feeding the web stepwise to the sealing device by releasing periodically variable quantities of the web.