Closed draw transfer system with gaseous pressure direction of web

• US 3,981,084 A
• Filed: 05/01/1974
• Issued: 09/21/1976
• Est. Priority Date: 06/19/1972
• Status: Expired due to Term

• Current Assignee: Fort Howard Corp. (KOCH Industries Incorporated)
• Original Assignee: Fort Howard Paper Company (KOCH Industries Incorporated)
• Inventors: Sobota, John T.
• Primary Examiner(s): Bashore, S. Leon
• Assistant Examiner(s): Fisher, Richard V.
• Application Number:
  US05/465,895
• Time in Patent Office: 874 Days
• Field of Search: 162/202, 162/204, 162/205, 162/207, 162/290, 162/306, 162/307, 162/348, 162/358, 162/359, 162/360 R, 162/363, 162/369, 162/370, 162/371, 162/372, 34/18, 34/123, 34/152, 34/162, 100/118, 100/153, 100/174, 100/176
• US Class Current: 34/123
• CPC Class Codes: D21F 2/00 Transferring webs from wet ends to press sections handling webs in general B65H
• CPC Class Codes: D21F 3/0281 in combination with a dryer roll
• CPC Class Codes: D21F 9/02 of the Fourdrinier type

Abstract

A paper making apparatus and process of the type wherein the paper is processed from a starting condition of a slurry of pulp fiber to a later condition of a continuous self-sustaining paper sheet. The paper is carried continuously along a preselected path of travel extending from the starting condition to the later condition and for processing the paper as it is being carried. The path of travel normally includes a plurality of pairs of contacting members, including a forming wire and a pick-up felt, a pick-up felt and a bottom felt, and a pick-up felt and Yankee dryer, such contacting members processing the paper. The paper is passed through each nip defined by each of the contacting members and continues along its desired path of travel. Air pressure is applied on the discharge side or outgoing side of one or more of the nips defined between the sets of contacting members. The air pressure is applied in a direction which causes the paper to remain in the desired path of travel and to avoid deviation thereof from the desired path of travel.

Claims

1. A paper making apparatus for assuring movement of paper in the desired path of travel after passing through a nip in a closed draw transfer system, said apparatus comprising, in combination, a gas permeable top pick-up felt having paper carried thereon for processing, a Yankee dryer for assisting in defining said nip with said felt, said paper being located between said felt and said Yankee dryer at said nip, said nip having an outgoing side and an incoming side, means for moving said felt and thereby said paper to said nip for processing said paper at said nip, a roller associated with said felt for cooperating in defining said nip, a chamber defined with said roller, means for communicating the outer surface of said roller with the interior of said chamber, means for substantially continuously applying gaseous pressure from within said chamber through said communicating means in a direction towards said Yankee dryer on said outgoing side of said nip through said gas permeable felt and against said paper being passed through said nip so as to urge said paper onto said Yankee dryer, only said felt carrying said paper to said nip and only said Yankee dryer carrying said paper from said nip after passing through said nip.

2. The apparatus of claim 1 wherein said roller also contains a vacuum chamber on the incoming side of said nip for cooperating in receiving water from said pick-up felt and from said paper.

3. The apparatus of claim 1 wherein said gaseous pressure applying means is substantially coextensive with the width of said paper.

4. The process of claim 1 wherein said roller includes perforations for defining said communicating means and also includes a gaseous air pressure chamber defined on said outgoing side of said nip for defining said gaseous pressure applying means.