US PATENT SUBCLASS 493 / 418
.~.~.~ Folding by direct application of vacuum or fluid

Current as of: June, 1999
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493 /   HD   MANUFACTURING CONTAINER OR TUBE FROM PAPER; OR OTHER MANUFACTURING FROM A SHEET OR WEB

395  DF  BENDING {6}
405  DF  .~ Folding {13}
416  DF  .~.~ With means to advance work or product {8}
418.~.~.~ Folding by direct application of vacuum or fluid

DEFINITION

Classification: 493/418

Folding by direct application of vacuum or fluid:

(under subclass 416) Method or apparatus including (a) application of reduced pressure to certain portions of a sheet or web workpiece so that atmospheric pressure acting on an opposing portion thereof effects the stress to form a crease line in the workpiece; or, (b) application of increased pressure from a flowable medium to effect the stress to form a crease line in the workpiece.