US PATENT SUBCLASS 53 / 549
.~.~ By twisting


Current as of: June, 1999
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53 /   HD   PACKAGE MAKING

545  DF  PROGRESSIVELY SEAMED COVER WEB OR WEB FOLDS {3}
548  DF  .~ With closing of web between package units {3}
549.~.~ By twisting


DEFINITION

Classification: 53/549

By twisting:

(under subclass 548) Apparatus including means to form the transverse seam (a) by relatively rotating one portion of the tube with respect to a stationarily held adjacent second portion or (b) by relatively rotating two adjacent tube portions in opposite directions, the rotation being about the longitudinal axis of the tube whereby a coiled or convolved winding is produced forming a necked down section in the tube to segregate the package units.

SEE OR SEARCH THIS CLASS, SUBCLASS:

217, and 370, for apparatus to close a filled package by twisting.

483, for methods of closing packages by twisting.