Method and apparatus in the drying section of a paper making mac

Details Method and apparatus in the drying section of a paper making mac Method and apparatus in the drying section of a paper making mac

1990-04-24

1991-05-28

Fisher, Richard V.

Paper making and fiber liberation

Processes and products

Lead strip forming and/or guiding

34117, D21F 502

Patent

active

050192132

ABSTRACT:
A method and apparatus in a drying section of a paper making machine wherein a so-called single-wire draw is applied and wherein blow boxes (20) are used, which are intended to prevent phenomena that disturb the mutual support contact between the web (W) and the drying wire (12). The blow boxes (20) extend across the entire width of the web (W), and they communicate with members (17, 18, 21, 22) that supply blow air, and they are provided with at least two nozzle slots (13, 14) transverse to the running and longitudinal direction of the web (W) as well as with a carrier face (16) between said nozzle slots. Negative pressure is produced in the space (A-) defined by the carrier face (16) and the drying wire (12) by means of the ejection and prevention effects of the air jets (F.sub.1, F.sub.2) blown through the nozzle slots (13,14). In order to speed the threading of the web (W), in the blow boxes (20) the blow sections (24.sub.k+1. . . 24.sub.N ) that remain outside the transverse area (A) of the leader band (R) are closed. The blowing, which has thereby been intensified, is applied through both of the opposite nozzles (13, 14) of the blow boxes (20) in connection with the threading only within the area (A) comprising the width (L.sub.R) of the leader band (R).

REFERENCES:
patent: 2714342 (1955-08-01), Beachler
patent: 4477983 (1984-10-01), Andersson
patent: 4625434 (1986-12-01), Karlsson
patent: 4628618 (1986-12-01), Virta et al.
patent: 4648942 (1987-10-01), Wanke
patent: 4684443 (1987-08-01), Kerttula et al.

Affiliated with

Also associated with

Rating

Method and apparatus in the drying section of a paper making mac does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus in the drying section of a paper making mac, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus in the drying section of a paper making mac will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-33995