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WO1993015267A1 - Cylindres secheurs - Google Patents

Cylindres secheurs Download PDF

Info

Publication number
WO1993015267A1
WO1993015267A1 PCT/CA1993/000016 CA9300016W WO9315267A1 WO 1993015267 A1 WO1993015267 A1 WO 1993015267A1 CA 9300016 W CA9300016 W CA 9300016W WO 9315267 A1 WO9315267 A1 WO 9315267A1
Authority
WO
WIPO (PCT)
Prior art keywords
dryer
web
grooves
cylinder
vapour
Prior art date
Application number
PCT/CA1993/000016
Other languages
English (en)
Inventor
Hugh Grigg Marshall
Robert André LEBORGNE
David Ernest Gamble
Original Assignee
Asea Brown Boveri Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Asea Brown Boveri Inc. filed Critical Asea Brown Boveri Inc.
Publication of WO1993015267A1 publication Critical patent/WO1993015267A1/fr

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/02—Drying on cylinders
    • D21F5/021—Construction of the cylinders

Definitions

  • This invention relates to an apparatus for enhancing the rate of drying of a web of material passing over a cylinder in a drying machine and in particular, to an apparatus for enhancing the rate of drying of a web of paper in a paper drying machine.
  • cylinders are provided in the dryer section of a paper machine around which the web is advanced.
  • the dryer section of a paper machine is generally provided with continuous belts of dryer fabrics which are held against approximately 50% of the cylinder surface by fabric tension. This is generally utilized in a two cylinder-high dryer section.
  • the dryer fabric and the web material are advanced together onto a dryer cylinder, such that the dryer fabric presses against the web material and in turn presses the web material into intimate contact with the dryer cylinder surface.
  • standard dryer sections comprise the dryer cylinders stacked single or two high. There are many other dryer section arrangements such as single-tier or multi-tier types.
  • the present invention seeks to provide a simple and economical means for improving the drying ability of a web drying apparatus and more specifically a gas heated paper dryer.
  • a dryer cylinder for use in a dryer system in which a web material to be dried is held in contact with and advanced over at least part of the surface of a rotatable dryer cylinder and the surface being supported by a cylindrical shell, the cylinder comprising means formed in the dryer surface and extending into the shell such that, in use, vapour generated between the web and the dryer surface is permitted to flow into the means and away from the web so that lifting of the web due to pressure exerted by the vapour is inhibited.
  • FIGURE 1 is a schematic side elevation view of a typical web dryer system
  • FIGURE 2 is a perspective view of a dryer cylinder according to the present invention
  • FIGURE 3 is a cross-sectional view of part of the dryer cylinder shown in Figure 2;
  • FIGURE 4 is a graph showing the average drying rate versus temperature for a dryer using a dryer cylinder according to the present invention
  • FIGURE 5 is a schematic end elevation of a five foot diameter dryer cylinder
  • FIGURES 6 and 7 are details of the surface of a dryer cylinder according to the invention.
  • FIGURE 8 is a detailed, segmental sectional view of a portion of a dryer cylinder incorporating lateral flow features.
  • FIGURE 9 is a schematic end view of a gas heated paper dryer illustrating its incorporation as a gas- phase reactor.
  • a typical web dryer system is illustrated and comprises an upper tier of dryer cylinders 12 and a lower tier of dryer cylinders 16.
  • a web W is wrapped by fabric F against a first dryer cylinder 12 of the upper tier 14 thereof.
  • the web W leaves the heated upper dryer cylinder 12 and extends in an open draw towards and around a lower dryer cylinder 16 of the lower tier 18 thereof.
  • Drying of the web is generally achieved by steam dryers and is augmented by heating the dryer cylinders 12 and 16 internally, preferably by means of a gas burner (not shown) . These burners are positioned within the cylinders to effect heating of the walls and surface thereof and thereby to heat the web in direct contact with the outer cylindrical surface. Details of such a gas heated cylinder dryer are disclosed in Applicant's U.S. Patent No. 4,693,015 issued September 15, 1987. Referring to Figure 2, a dryer cylinder 12 or 16 of Figure 1 is shown in more detail. The cylinder has an outer cylindrical surface 20. A plurality of circumferentially spaced grooves 30 are machined into the shell 22 of the cylinder 12, as may be seen in Figure 3.
  • the web W and the dryer fabric F are advanced over approximately 50% of the dryer cylinder surface 20.
  • the web W is held in intimate contact with the cylinder surface 20 by fabric tension.
  • the web W is rapidly heated to temperatures in the order of 212°F and substantially no condensation of vapour may take place.
  • the grooves 30 as shown in Figure 3 ensure that, in use, vapour generated between the cylinder surface 20 and the web W is permitted to flow through the grooves 30, away from the web W, thus reducing the lifting of the web off the dryer surface 20 and increasing drying.
  • a preferred arrangement of the invention is illustrated in which the grooves 30 are rectangular in cross-section and penetrate the dryer shell 22 to a depth "D" of approximately 3/8 inch.
  • any vapour collecting between the web W and the surface 20 of the dryer is channelled or directed into the grooves 30 and is expelled from the ends of the grooves as the dryer cylinder rotates.
  • the graph of Figure 4 shows the results of pilot paper machine tests conducted with a smooth and grooved surface dryer cylinders.
  • the graph 42 is a plot of the results for a grooved dryer cylinder and the plot marked 44 is the results of a smooth surface dryer.
  • the average drying rate is considerably higher than with non-grooved dryer cylinders at high temperature.
  • Figure 5 is a schematic end view of a five foot diameter cylinder 50 intermediate a pair of fabric rollers 52.
  • the path of the paper 54 is shown as is the path of the fabric 56.
  • each circumferential groove would be subdivided into thirty-six 5 and 1/4 inch segments 60 as shown in Figure 6.
  • the grooves are 1/16 of an inch wide by 5/16 of an inch deep.
  • the groove is segmented every 5.25 inches on the five foot diameter cylinder to provide the thirty- six segments in the circumferential path of the groove.
  • the groove has, in each segment 60, six laterally drilled apertures 62 (two of which are illustrated) of approximately 1/8 inch diameter to allow vapour to flow laterally to the front and back ends of the dryer.
  • the dryer shell 64 is provided with the grooves 58 (not to scale) , the front and rear walls 66, 68 of the dryer shell being provided with a collector housing 70, isolated from the dryer shell by suitable seals 72. As illustrated in relation to end wall 66, ports 74 are drilled in each end wall 66, 68 of the shell so as to conduct vapour to the collectors 70 from where it is removed and forwarded to a pre-boiler, compressor or the like.
  • a gas phase reactor is used to enhance the water resistant properties of paper.
  • a substance such as ASA (alkenyl succinic anhydride) or AKD (alkyl ketene di er) is sprayed on to the paper web as at 76 and then enters the gas reaction chamber*.
  • ASA alkenyl succinic anhydride
  • AKD alkyl ketene di er
  • the number of grooves per unit width is a function of the difficulty of making narrow grooves as well as a function of the ability of the web W to lift briefly and let vapour pass to the groove, and in part a function of the lateral permeability of the web W, i.e. its resistance to the flow of vapour laterally to the groove.
  • the depth of the groove is a function of the metal temperature and fabric tension F which causes the rate of vapour generation or evaporation of water and the vertical permeability of the web which causes the resistance to vapour flow through the web.
  • the groove depth must be large enough so that vapour generated by evaporation can escape through the grooves so as not to exceed the pressure exerted by the fabric.
  • groove widths and depths as well as the percentage of grooving will vary, depending on paper grades.
  • the grooved cylinders may be applied to any arrangement of dryer cylinders and dryer fabrics.

Landscapes

  • Drying Of Solid Materials (AREA)
  • Paper (AREA)

Abstract

L'invention se rapporte à un cylindre sécheur (12, 16) utilisé dans un système de séchage dans lequel un matériau en bande (w), devant être séché, est maintenu en contact avec au moins une partie de la surface (20) d'un cylindre sécheur rotatif (16) tout en avançant au-dessus de cette surface, celle-ci étant soutenue par une enveloppe cylindrique. Le cylindre sécheur comprend une multiplicité de rainures (30) ménagées dans la surface de séchage et se prolongeant dans l'enveloppe, de sorte qu'en cours d'utilisation, la vapeur générée entre la bande et la surface de séchage peut s'écouler dans les rainures et s'éloigner de la bande, ce qui empêche que la bande ne soit soulevée par la pression exercée par la vapeur. L'efficacité du système de séchage est ainsi considérablement accrue.
PCT/CA1993/000016 1992-01-27 1993-01-26 Cylindres secheurs WO1993015267A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US82641692A 1992-01-27 1992-01-27
US07/826,416 1992-01-27

Publications (1)

Publication Number Publication Date
WO1993015267A1 true WO1993015267A1 (fr) 1993-08-05

Family

ID=25246481

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CA1993/000016 WO1993015267A1 (fr) 1992-01-27 1993-01-26 Cylindres secheurs

Country Status (2)

Country Link
AU (1) AU3341593A (fr)
WO (1) WO1993015267A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3572583A4 (fr) * 2018-03-30 2020-03-04 Maintech Co., Ltd. Procédé pour pulvériser une solution chimique

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3815256A (en) * 1973-03-12 1974-06-11 Beloit Corp Grooved dryer

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3815256A (en) * 1973-03-12 1974-06-11 Beloit Corp Grooved dryer

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3572583A4 (fr) * 2018-03-30 2020-03-04 Maintech Co., Ltd. Procédé pour pulvériser une solution chimique
EP3572582A4 (fr) * 2018-03-30 2020-03-04 Maintech Co., Ltd. Procédé pour pulvériser une solution chimique
CN111936696A (zh) * 2018-03-30 2020-11-13 明答克株式会社 药液的吹送方法
CN111936695A (zh) * 2018-03-30 2020-11-13 明答克株式会社 药液的吹送方法
CN111936695B (zh) * 2018-03-30 2023-09-05 明答克株式会社 药液的吹送方法
CN111936696B (zh) * 2018-03-30 2023-09-05 明答克株式会社 药液的吹送方法

Also Published As

Publication number Publication date
AU3341593A (en) 1993-09-01

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