Method of producing a spray bonded multi-ply tissue product
AssigneeEastern Pulp & Paper Corp.
InventorsRalph B. Lichtenberg, Joseph H. Torras, Sr., Eric C. Taylor, Michael Brown
Life of this patent
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Abstract
Multi-ply tissue product is bonded by an adhesive spray whose position is controlled so that the web path distance between the spray application and the location where the webs are forced together permits sprayed adhesive to partially but not completely set during travel over that web path distance at operating web speeds. Typically, the web path distance between the nozzle and the location is more than 140 inches. The webs are positioned one in back of the other and each is unwound onto its own carrier roll, with the spray positioned between the carrier rolls.
Claims34
A method of producing an adhesively bonded multi-ply tissue product by:
- A. providing at least two reels of tissue;
- B. unrolling each of the reels to produce at least two moving webs, the web speed being over 1500 feet/min;
- C. spraying an adhesive mixture upwardly onto at least one of the moving webs from at least one nozzle array positioned in a spray location below one of the webs;
- D. compressing the webs together as they run through a nip formed by two nip rolls positioned at a compression point downstream of the spray location;
- and
- E. winding the bonded multi-ply tissue product onto a roll under tension using a winder which pulls the multi-ply product, exerting tension on it, the method being further characterized in that the nip rolls are forced together by a force sufficient to isolate the tension to a region between the nip and the winder.
A method of producing an adhesively bonded multiply tissue product by:
- A. providing at least two reels of tissue;
- B. unrolling each of the reels to produce multiple moving webs, the web speed being over 1500 feet/min;
- C. spraying an adhesive mixture upwardly onto at least one of the moving webs from at least one nozzle array positioned in a spray location below at least one of the webs;
- D. winding the bonded multi-ply tissue product onto a roll under tension using a winder which pulls the multi-ply product, exerting tension on it, the method being further characterized in that the amount of adhesive flow provided to the spray head is directly controlled with respect to, and a function of, the web travel speed, so as to provide a controlled overall ratio of dry adhesive per unit area of web at different web speeds.
A method of producing an adhesively bonded multi-ply tissue product having at least three plies by:
- A. providing at least three reels of tissue;
- B. unrolling each of the reels to produce at least an upper moving web, a middle moving web and a lower moving web, the web speed being over 1500 feet/min;
- C. spraying an adhesive mixture upwardly onto the upper moving web from a rear nozzle array positioned in a rear spray location below the upper moving web;
- D. spraying an adhesive mixture upwardly onto the middle moving web from a forward nozzle array positioned in a front spray location below the middle moving web;
- E. compressing the webs into the bonded multi-ply tissue product by winding the webs together under tension from a winder around a roll positioned downstream of both the rear spray location and the front spray location to force the three webs together;
- the method being further characterized in that,
- F. both the front and the rear spray locations are spaced from the roll at web path distances selected to permit sprayed adhesive to partially but not completely set during travel over that distance at operating web speeds, whereby the adhesive mixture bonds the webs together into the adhered multi-ply product.
Dependencies are inferred from the claim text.