US2939222A - Method for drying or other treatment of a web-like material - Google Patents

Method for drying or other treatment of a web-like material Download PDF

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Publication number
US2939222A
US2939222A US438728A US43872854A US2939222A US 2939222 A US2939222 A US 2939222A US 438728 A US438728 A US 438728A US 43872854 A US43872854 A US 43872854A US 2939222 A US2939222 A US 2939222A
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United States
Prior art keywords
web
medium
treatment
drying
treating
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Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
US438728A
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English (en)
Inventor
Svavar Filip
Gustafsson Rune
Waern Torsten
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Svenska Flaktfabriken AB
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Svenska Flaktfabriken AB
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Publication of US2939222A publication Critical patent/US2939222A/en
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Expired - Lifetime legal-status Critical Current

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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

Definitions

  • the present invention relates to a method for drying or similar treatment of a web-like material, which during the treatment, is carried on one or more heated, preferably cylindrical, surfaces, and at the same time is exposed to a treating medium.
  • the treatment is improved by directing a gaseous treating medium against the material while it is in contact with the heated surface.
  • the present invention is based on the fact that a substantially increased treating effect may be achieved by supplying the treating medium under controlled conditions so that the different stages of the treatment take place according to the different physical conditions of the material. It has been proved that by treating pulp or similar hygroscopic materials on heated surfaces, the intensity of evaporation varies in a predetermined manner at different points in the path of travel of the material on the heated surfaces.
  • the distance AB represents the part of the path where the fibres and liquids are heated to the wet bulb temperature of the treating medium.
  • the distance B--C in the curve represents the part of the path where the evaporation is substantially constant, as from a wet surface, whereas the distance CD represents part of the path where the evaporation takes place with decreasing intensity.
  • the change in the evaporation curve at the point C is due to the fact that during the period B--C, the heat conduction through the material and the heat transmission to the same, are dominating.
  • the present invention relates to an improved method for drying or similar treatment of a hygroscopic material of the type mentioned above wherein the method is accomplished by controlling the condition of the treating medium supplied to the material in the stages before and after the material reaches its fibre saturation state differently so as to correspond to the above-mentioned variations in the evaporation intensity during such stages.
  • the invention is characterized in that the treatment is controlled to provide at least one stage before the fibre saturation point is passed and one stage after said point, and that the treatment medium is caused to circulate in the first stage with a certain amount being discharged to open air, while a corresponding quantity of the treatment medium is conducted from the second stage and mixed with the recirculated portion of the medium from the first stage prior to introducing the mixture into the first stage.
  • F g. 1 illustrates an evaporation curve in which the vertical axis represents the intensity of evaporation and the horizontal axis represents the distance of the material from the starting point;
  • Fig. 2 illustrates a suitable embodiment of an apparatus for performing the method of the present invention.
  • a web 1 which is wetter than its fibre saturation state is advanced onto a heated surface 3 and after treatment, is withdrawn in a condition dryer than its fibre saturation state, as indicated at 33.
  • a heated surface is shown, but there is no obstacle for treating the material progressively on -a plurality of heated surfaces.
  • Distributing boxes 6 and 29 extend over the entire width of the heated surface 3.
  • the boxes 6 adjacent the inlet end of the apparatus are provided with slots 4 or perforations for supplying the treating medium to the web while it is supported on the heated surface 3.
  • the intermediate spaces 5 between the boxes are utilized for removing and exhausting the treating medium after being used.
  • the used treating medium is collected in the space 8 which is formed by the intermediate space between the outer casing 9a and the distributing boxes 6.
  • the treating medium is discharged through a duct 34 and is partially exhausted by means of a fan 10 and partially recirculated by a fan 12.
  • the treating medium exhausted by the fan 10 is either conducted away directly to open air or is passed through one or more heat exchangers, the different parts of which are designated 13, 14, 15, 16, and 17.
  • a damper 11 is provided between the duct 34 and the inlet of the fan 12, for adjusting the proportion between the recirculated and exhausted portions of the treating medium.
  • the points A, B, C, and D correspond to the points shown in the evaporation curve of Fig. 1.
  • the treating medium is supplied through the duct 20 and through a heat exchanger 18 and damper 19, and then introduced by means of the distributing boxes 6 to the part of the path of travel corresponding to the distance A-C in the curve of Fig. 1, where C indicates the point where the material reaches the fibre saturation state.
  • the medium is controlled to insure that the material reaches the fibre saturation state at point C.
  • the treating medium is supplied in the same way by means of the distributing boxes 29 provided with openings 30 and arranged so that the treating medium used in this part of the path of travel is removed and exhausted through intermediate spaces 31 between the boxes.
  • the used treating medium is collected in a space 28 formed by the intermediate space between the casing 9b and the boxes 29. From this space, the used treating medium, to a substantial extent, is conducted through a duct 35 to a fan 12.
  • Some of the treating medium introduced to and removed from the web in the path CD may be recirculated via a damper 21 and a duct 23 to a fan 24 for recirculation.
  • This part of the treating medium following the fan 24 is caused to pass through a heat exchanger 25 and a damper 27 and is then introduced through a duct 26 to the distributing boxes 29 arranged over the path C-D of the web, i.e. the part of the path of the web situated between the fibre saturation state C and the end D of the treatment.
  • the medium is controlled to cause the material to reach the desired final condition at the point D.
  • the treating medium recirculated in this part of the process may be mixed with the necessary amount of fresh treating medium supplied from the outside, either as an 3 a ungoiligitioned medium or from the heat exchangers 13 an While a particular embodiment of the present invention has been herein illustrated and described, it is not intended to limit the invention to such disclosure, but changes or modifications may be made therein and thereto within the scope ofthe following claims.
  • zone to a second gaseous drying medium through said other surface, controlling the second medium to dry the heated web by difiusion in accordance with the hydroscopic properties of the web to cause the web to reach said desired condition at the end of the second stage of drying, exhausting the first and second gaseous mediums from the respective stages of the treatment Zone after subjecting the web material thereto, conducting the said first and second gaseous mediums in a generally counter-current direction to the travel of the web material by discharging a given quantity comprising at: least a.
  • first and second gaseous drying mediums are introduced into the treatment zone at a plurality of areas located at spaced intervals longitudinally of the web and extending transversely of the width thereof and are exhausted from the treatment zone outwardly through the spaces between the longitudinally spaced areaswhereby the web throughout each stage is treated by drying medium at a condition controlled in accordance with the condition of the web relative to its fibre saturation state.
  • control of the second gaseous medium provides'a drying power in said medium greater than the drying power in said first gaseous medium.

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  • Drying Of Solid Materials (AREA)
US438728A 1953-06-30 1954-06-23 Method for drying or other treatment of a web-like material Expired - Lifetime US2939222A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE330840X 1953-06-30

Publications (1)

Publication Number Publication Date
US2939222A true US2939222A (en) 1960-06-07

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US438728A Expired - Lifetime US2939222A (en) 1953-06-30 1954-06-23 Method for drying or other treatment of a web-like material

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US (1) US2939222A (de)
CH (1) CH330840A (de)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3071865A (en) * 1958-01-30 1963-01-08 Time Inc Web dryer
US3085347A (en) * 1960-03-09 1963-04-16 Beloit Iron Works Web breaking control in drying apparatus
US3167408A (en) * 1961-11-16 1965-01-26 Beloit Corp Dryer hood construction for web material
US3196556A (en) * 1962-02-06 1965-07-27 Svenska Flaektfabriken Ab Apparatus for controlling the drying and evaporation intensity of paper machine cylinders
US3208158A (en) * 1963-04-09 1965-09-28 Hupp Corp Dryers
US3398016A (en) * 1964-07-10 1968-08-20 Du Pont Coating and drying thermally sensitive thermoplastic film
US3797126A (en) * 1972-08-25 1974-03-19 R Parkes Drum dryer
US3867767A (en) * 1973-06-25 1975-02-25 Xerox Corp Preconditioner for paper stock
US4103434A (en) * 1972-05-30 1978-08-01 Richard Turner Walker Drying apparatus
US4169321A (en) * 1976-06-16 1979-10-02 Airtech Systems, Inc. Waste heat recycling system
EP0501035A1 (de) * 1991-02-26 1992-09-02 Sulzer-Escher Wyss Gmbh Wärmeschutzhaube
US5309650A (en) * 1991-08-29 1994-05-10 Abb Flakt, Inc. Method and apparatus for ventilating a paint baking oven

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4413427A (en) * 1981-07-29 1983-11-08 Aer Corporation Fuel control system for dryer

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1757948A (en) * 1928-06-26 1930-05-06 Claude C Hockley Method and apparatus for making paper
GB354099A (de) * 1929-09-19 1931-08-06 Richard Schroder
DE652038C (de) * 1936-03-01 1937-10-23 C G Haubold A G Luftfuehrung fuer Gewebespann- und -trockenmaschinen
US2107275A (en) * 1936-07-28 1938-02-08 Du Pont Drying equipment
DE674969C (de) * 1936-03-06 1939-04-26 Johannisberg G M B H Maschf Trockenvorrichtung an Rotationstiefdruckmaschinen fuer bedruckte Papierbahnen
US2268988A (en) * 1939-08-08 1942-01-06 Interchem Corp Method and apparatus for drying printing ink
CH261636A (de) * 1949-03-16 1949-05-31 Sulzer Ag Trockenvorrichtung.

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1757948A (en) * 1928-06-26 1930-05-06 Claude C Hockley Method and apparatus for making paper
GB354099A (de) * 1929-09-19 1931-08-06 Richard Schroder
DE652038C (de) * 1936-03-01 1937-10-23 C G Haubold A G Luftfuehrung fuer Gewebespann- und -trockenmaschinen
DE674969C (de) * 1936-03-06 1939-04-26 Johannisberg G M B H Maschf Trockenvorrichtung an Rotationstiefdruckmaschinen fuer bedruckte Papierbahnen
US2107275A (en) * 1936-07-28 1938-02-08 Du Pont Drying equipment
US2268988A (en) * 1939-08-08 1942-01-06 Interchem Corp Method and apparatus for drying printing ink
CH261636A (de) * 1949-03-16 1949-05-31 Sulzer Ag Trockenvorrichtung.

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3071865A (en) * 1958-01-30 1963-01-08 Time Inc Web dryer
US3085347A (en) * 1960-03-09 1963-04-16 Beloit Iron Works Web breaking control in drying apparatus
US3167408A (en) * 1961-11-16 1965-01-26 Beloit Corp Dryer hood construction for web material
US3196556A (en) * 1962-02-06 1965-07-27 Svenska Flaektfabriken Ab Apparatus for controlling the drying and evaporation intensity of paper machine cylinders
US3208158A (en) * 1963-04-09 1965-09-28 Hupp Corp Dryers
US3398016A (en) * 1964-07-10 1968-08-20 Du Pont Coating and drying thermally sensitive thermoplastic film
US4103434A (en) * 1972-05-30 1978-08-01 Richard Turner Walker Drying apparatus
US3797126A (en) * 1972-08-25 1974-03-19 R Parkes Drum dryer
US3867767A (en) * 1973-06-25 1975-02-25 Xerox Corp Preconditioner for paper stock
US4169321A (en) * 1976-06-16 1979-10-02 Airtech Systems, Inc. Waste heat recycling system
EP0501035A1 (de) * 1991-02-26 1992-09-02 Sulzer-Escher Wyss Gmbh Wärmeschutzhaube
US5255447A (en) * 1991-02-26 1993-10-26 Sulzer-Escher Wyss Gmbh Heat protection hood
US5309650A (en) * 1991-08-29 1994-05-10 Abb Flakt, Inc. Method and apparatus for ventilating a paint baking oven

Also Published As

Publication number Publication date
CH330840A (de) 1958-06-30

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