Form, fill and seal industrial bag machine

摘要

Side gusseted industrial bags are continuously (or intermittently) formed from continuous web materials, and simultaneously filled and sealed in one fast operation by the method and apparatus of this invention. The various features of the invention include a tube former which wraps the web about a shaped filling mandrel most preferably with the assistance of an air bearing, registration and tension controls to accurately maintain the register of the web in relationship to printed blocks or indicia; evacuation steps to neatly gusset the bag with or without mechanical assistance, to tighten the bag firmly about the product, and to continuously wash the inside welding surfaces thereof with a cleansing high velocity air stream to thereby retain such surfaces in a more virgin or noncontaminated welding condition; filling steps that are practiced to provide a free margin of material at the top of the bag to complement the welding and gusseting steps; and hot gas welding and chilling techniques that can provide tough welds or seals with high repeatability, and which are able to withstand the shock or weight of the product load with sufficient immediacy to enable fast production cycles.