.~.~> Vertically formed, filled, and sealed tubular package
DEFINITION
Classification: 53/450
Enclosing contents within progressively formed web means:
(under subclass 396) Methods for forming tubular packages successively from a continuous web or a plurality of continuous webs of cover material including the steps of (a) bringing together marginal portions of the web(s) and continuously securing the resulting longitudinal seam(s), or (b) bringing together marginal portions of plural, superposed webs and periodically forming and securing transverse seams.
(1) Note. If the contents are placed on or between webs after trailing transverse seals are made, the patent is considered involving fabrication of the cover for subclasses 452+.
(2) Note. If the web is treated by heat or pressure to stretch form the web into a contents-retaining form prior to or during packaging, the art is in subclass 453.
SEE OR SEARCH THIS CLASS, SUBCLASS:
455, for methods of folding and side sealing web material.
545+, for corresponding apparatus.
SEE OR SEARCH CLASS
156, Adhesive Bonding and Miscellaneous Chemical Manufacture, 203, for methods of forming a tube.
493, Manufacturing Container or Tube From Paper; or Other Manufacturing From a Sheet or Web,
198, for forming a series of interconnected pliable containers.
