Method for order transition on a plunge slitter
AssigneeMarquip, Inc.
InventorJames A. Cummings
Life of this patent
Estimating the term…
Abstract
An order transition in a corrugated is accomplished by creating an overlap of the slits made by the slitting tools associated with the expiring (running) and new orders. However, the slit tool associated with the innermost slit between the upper and lower level outs is maintained in slitting contact with the board to extend the slit line into further overlap with the slits made by the new order tools to create an order change region. A lateral cut is made to connect the innermost slit between the upper and lower level outs on the new order and the slit created by the tool delayed from withdrawal in the running order.
Claims4
A method for minimizing scrap in a gapless order change for a corrugator, said corrugator including a plunge slitter having multiple slitting tools, each operable to be moved vertically into slitting engagement with a continuous corrugated paperboard web at the start of a new order to provide longitudinal slit lines in the web, the slit lines dividing the web into a plurality of output webs of selected widths, said slitting tools operable to be moved vertically out of slitting engagement with the web at the end of a running order, a pair of vertically separated cut-off knives downstream of the slitter for receiving and cutting the output webs into selected sheet lengths, said knives including an upper knife and a lower knife, and a web selector device between the slitter and the cut-off knives for selectively separating the output webs along a common innermost slit line into an upper output web portion and a lower output web portion for said respective upper knife and lower knife, said method comprising the steps of:
- (1) operating the slitter to start a new order while continuing to slit the running order to create an overlap region in the web where all running order and new order slits overlap;
- (2) maintaining the slitting tool for the common innermost slit line of the running order in slitting engagement with the web for a selected distance beyond the overlap region to define with the new order slit lines an order change region upstream of and outside the overlap region;
- and,
- (3) partially severing the web upstream of the web selector device to provide a generally transverse slit in the order change region to connect the common innermost slit line of the running order web portions and the common innermost slit line of the new order output web portions.
Dependencies are inferred from the claim text.