Pulp Bale Single Wire Wrapper

T27 Hugger

Abstract

The Single Wire Wrapper (SWW) project designed for a market pulp mill allows pulp bales to be wrapped with a single wire as opposed to the current 2 wire system at a rate of 1000 tpd (4500
bales/day). Decreased wire costs, increased throughput, and increased margin on sales provide approximately $700k/year value to the client. Currently, bales are wrapped with two sheets of paper wrap; one on top and one underneath. The packaging line secures both sheets with one wire, moves the bale along a conveyor, rotates the bale 90*, folds the ends of the wrap, and
secures the folds with the second wire perpendicular in orientation to the first. At this point the first wire is rendered useless.

The team completed a detailed design and fabrication package of the SWW system to hold the wraps in absence of the first wire. The design included extended rails to hold wrap along the conveyor, a tower to support a rotating frame with actuated gates (the Hugger) to hold wrap during bale rotation and folding, and a carriage with lifter to accommodate vertical and horizontal movement. Pneumatic actuators actively drive rotation and carriage returns while electric motors control the lifter and Hugger gates.

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