(under the class definition) Apparatus (a) for folding a single web of cover material longitudinally thereof and over upon itself as the web advances to produce at least one longitudinal seam thereon opposite the fold, (b) for assembling a plurality of generally parallel, spaced or superposed webs as they are advanced by forming longitudinal seams at least at the outer longitudinal edges thereof whereby a tube is formed, the seaming operation occurring concurrently with or subsequent to the association of the contents with the cover material, or (c) for assembling spaced or superposed webs and forming transverse seams to produce transverse tubular covers which may or may not be
subsequently longitudinally seamed.
(1) Note. The seam may be secured by an operation such as heat sealing, folding, pasting, etc.
(2) Note. If the web is formed by heat or pressure into contents-retaining form (e.g., stretch forming), the patent is excluded from this subclass.
SEE OR SEARCH THIS CLASS, SUBCLASS:
128.1+, for apparatus which secures a seam by the use or application of a cover adjunct, e.g., staple, sealing strip, thread, etc.
450, for corresponding methods.
559, for apparatus for stretch forming receptacles from a web. SEE OR SEARCH CLASS
112, Sewing, appropriate subclasses for apparatus for forming a seam by stitching.
156, Adhesive Bonding and Miscellaneous Chemical Manufacture, appropriate subclasses for laminating devices, per se, when not combined with filling operation, see especially
461+, for apparatus for longitudinally bending an endless web and forming a seam; and subclasses 543+ for joining endless webs.
219, Electric Heating,
200+, for electric heaters which may be employed for seaming.
452, Butchering,
32+, for sausage stuffers and subclasses 46+ for sausage linkers.
493, Manufacturing Container or Tube From Paper; or Other Manufacturing From a Sheet or Web,
248, for making a pliable container including infeeding a blank to a passive folder.
