US3191312A - Method of uniformly moistening paper and like hygroscopic web material - Google Patents

Method of uniformly moistening paper and like hygroscopic web material Download PDF

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Publication number
US3191312A
US3191312A US187991A US18799162A US3191312A US 3191312 A US3191312 A US 3191312A US 187991 A US187991 A US 187991A US 18799162 A US18799162 A US 18799162A US 3191312 A US3191312 A US 3191312A
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Prior art keywords
web
rolls
web material
moisture
hygroscopic
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US187991A
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Allander Claes
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Svenska Flaktfabriken AB
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Svenska Flaktfabriken AB
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H5/00—Special paper or cardboard not otherwise provided for
    • D21H5/0005—Processes or apparatus specially adapted for applying liquids or other fluent materials to finished paper or board, e.g. impregnating, coating
    • D21H5/0012—Processes or apparatus specially adapted for applying liquids or other fluent materials to finished paper or board, e.g. impregnating, coating by bringing paper into contact with an excess of fluids, the paper carrying away only a part of the fluid material, e.g. by passing through liquids, gases or vapours
    • D21H5/002—Processes or apparatus specially adapted for applying liquids or other fluent materials to finished paper or board, e.g. impregnating, coating by bringing paper into contact with an excess of fluids, the paper carrying away only a part of the fluid material, e.g. by passing through liquids, gases or vapours the paper being at least partly surrounded by treating medium on both sides
    • D21H5/0022—Processes or apparatus specially adapted for applying liquids or other fluent materials to finished paper or board, e.g. impregnating, coating by bringing paper into contact with an excess of fluids, the paper carrying away only a part of the fluid material, e.g. by passing through liquids, gases or vapours the paper being at least partly surrounded by treating medium on both sides treating medium being a gas or vapour
    • 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G7/00—Damping devices
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/32—Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper
    • D21H23/42—Paper being at least partly surrounded by the material on both sides
    • D21H23/44—Treatment with a gas or vapour

Definitions

  • the present invention relates to a method for conditioning paper and like hygroscopic web material.
  • a method for conditioning paper and like hygroscopic web material In View of the hygroscopic properties of such material, it is necessary to complete the manufacturing process by conditioning in order to bring the moisture ratio into equilibrium with normal storage atmosphere. Special types of paper are, moreover, subjected to such conditioning treatment in view of stability requirements for printing and the like.
  • the conditioning was carried out in several ways, the moisture ratio being determined, for example, by spraying finely distributed water through nozzles onto the web or by blowing steam against the web while at the same time passing the web over cooled rolls.
  • the web is passed through a closed space and subjected therein to the eliect of moist air with suitable controlled relative moisture.
  • the object of this invention is characterized in that the web material is advanced in a plurality of back-and-forth passes between a number of rotary cooled rolls, that the web material during its passage about the rolls is pressed against the same by means of one or a plurality of endless felt webs which also are directed about the rolls, and that in the said space a moisture saturated atmosphere is maintained, all of the said steps having the object of imparting to the said web material during its passage over the said cooled rolls as uniform a temperature as possible and a uniformly distributed moisture.
  • the conditioning may be carried out in two or more steps, in that the web material is passed through a treatment chamber divided into sections, and that in the said sections a relative differentiated atmospheric condition is maintained.
  • the drawing 1 designates a closed treatment chamber adapted for conditioning web material.
  • the said chamber comprises heat insulated walls, floor and ceiling ice which lie closely adjacent to a plurality of rotary cooled rolls 2 to advance the web material 3 in back-and-forth passes therebetween, so that both surfaces of the web material are alternately in Contact with the cylinder surface of the cooled rolls.
  • the chamber 1 has, of course, limited openings as at 11, to provide entrance and egress of the web 3, while limiting, as far as practicable the entrance of the outside air or egress of conditioned air from the interior of the chamber.
  • the web is pressed against the same by two endless felt webs 4a and 4b which together with the web material are directed about the cooled rolls and are further guided by a number of guide rolls Sa and 5b.
  • a moisture saturated atmosphere with a suitable temperature adjusted to the material in question is maintained by air conditioning and circulating means 1t).
  • air conditioning and circulating means 1t When contacting the said cooled rolls the web material absorbs on the roll surface moisture precipitated from the said atmosphere whichdue to the uniform contact ensured by the said felt websis distributed uniformly in the web material.
  • the hygroscopic felt webs absorb even moisture from the atmosphere, which moisture is also transferred to the web material during its passage over the cooled rolls.
  • the number of cooled rolls and the length of the felt webs may be adjusted in each individual case to the capacity desired.
  • the shape and construction of the said treatment chamber as well as the location of the cooled rolls and of the guide rolls may, of course, be varied in many ways within the scope of the inventive idea. In certain cases it may be preferable to divide the treatment chamber by partitionsinto a plurality of separate sections through which the web material is caused to pass and wherein relative differentiated atmospheric conditions are maintained.
  • the method of uniformly moistening a continuous web of paper or similar hygroscopic material comprising the following steps: providing a closed treatment chamber having disposed therein a plurality of spaced, rotatable, cooled rolls, said treatment chamber having walls lying closely adjacent to said rolls, advancing the web in a number of back-and-forth passes over said rolls, maintaining within said chamber a controlled atmosphere of relatively high humidity and regulated temperature, pressing an endless felt against the web alternately on the exterior of said web as it passes over said rolls, and concurrently therewith maintaining said felt web wholly Within said chamber whereby said web has a relatively uniform moisture condition throughout its extent.

Description

c. vALLMHDER 3,191,312 METHOD QF UNIFORMLY MOISTENING PAPER AND LIKE June 29, 1965 HYGROSCOPIC WEB MATERIAL Filed April 16. 1962 INVENTORI CLAES ALLANDER ATT'YS BY MW United States Patent O 3,191,312 METHQD F UNIFORMLY MQlSTENING PAPER AND LiKE HYGRSCOPIC WEB MATERIAL Claes Allander, Bromma, Sweden, assigner to Aktiebolaget Svenska Flaktfabrihen, Stockholm, Sweden Filed Apr. 16, 1962, Ser. No. 187,991 Claims priority, application Sweden, Apr. 17, 1961, 3,999/ 61 2 Claims. (Cl. 34-13) The present invention relates to a method for conditioning paper and like hygroscopic web material. In View of the hygroscopic properties of such material, it is necessary to complete the manufacturing process by conditioning in order to bring the moisture ratio into equilibrium with normal storage atmosphere. Special types of paper are, moreover, subjected to such conditioning treatment in view of stability requirements for printing and the like. The conditioning was carried out in several ways, the moisture ratio being determined, for example, by spraying finely distributed water through nozzles onto the web or by blowing steam against the web while at the same time passing the web over cooled rolls. According to another method, the web is passed through a closed space and subjected therein to the eliect of moist air with suitable controlled relative moisture. In the first mentioned cases, diiculties arise in distributing the moisture uniformly, and there is further a great risk of stain formation, particularly for material with a surface susceptible to staining. There is further the risk that a great portion of the moisture which after application was absorbed only by the outer surface layer will be allowed to evaporate before moisture balance could reach to the interior of the web. As a result thereof, the final moisture ratio will be too low. The last mentioned method, it is true, may render a very satisfactory result, but it requires, on the other hand, a treatment time of considerable length, which again necessitates a large and expensive treatment apparatus.
It is the object of this invention to overcome the said drawbacks and to render possible effective and uniform conditioning in a very short time. The invention is characterized in that the web material is advanced in a plurality of back-and-forth passes between a number of rotary cooled rolls, that the web material during its passage about the rolls is pressed against the same by means of one or a plurality of endless felt webs which also are directed about the rolls, and that in the said space a moisture saturated atmosphere is maintained, all of the said steps having the object of imparting to the said web material during its passage over the said cooled rolls as uniform a temperature as possible and a uniformly distributed moisture.
According to a suitable embodiment, the conditioning may be carried out in two or more steps, in that the web material is passed through a treatment chamber divided into sections, and that in the said sections a relative differentiated atmospheric condition is maintained.
The invention will be described more in detail in the following, reference being made to the accompanying drawing showing by Way of example an embodiment of an apparatus adapted for carrying out the said novel method.
In the drawing 1 designates a closed treatment chamber adapted for conditioning web material. The said chamber comprises heat insulated walls, floor and ceiling ice which lie closely adjacent to a plurality of rotary cooled rolls 2 to advance the web material 3 in back-and-forth passes therebetween, so that both surfaces of the web material are alternately in Contact with the cylinder surface of the cooled rolls. The chamber 1 has, of course, limited openings as at 11, to provide entrance and egress of the web 3, while limiting, as far as practicable the entrance of the outside air or egress of conditioned air from the interior of the chamber. During its passage about the cooled rolls, the web is pressed against the same by two endless felt webs 4a and 4b which together with the web material are directed about the cooled rolls and are further guided by a number of guide rolls Sa and 5b. In the treatment chamber, a moisture saturated atmosphere with a suitable temperature adjusted to the material in question is maintained by air conditioning and circulating means 1t). When contacting the said cooled rolls the web material absorbs on the roll surface moisture precipitated from the said atmosphere whichdue to the uniform contact ensured by the said felt websis distributed uniformly in the web material. The hygroscopic felt webs absorb even moisture from the atmosphere, which moisture is also transferred to the web material during its passage over the cooled rolls.
The number of cooled rolls and the length of the felt webs may be adjusted in each individual case to the capacity desired. The shape and construction of the said treatment chamber as well as the location of the cooled rolls and of the guide rolls may, of course, be varied in many ways within the scope of the inventive idea. In certain cases it may be preferable to divide the treatment chamber by partitionsinto a plurality of separate sections through which the web material is caused to pass and wherein relative differentiated atmospheric conditions are maintained.
What I claim is:
1. The method of uniformly moistening a continuous web of paper or similar hygroscopic material, comprising the following steps: providing a closed treatment chamber having disposed therein a plurality of spaced, rotatable, cooled rolls, said treatment chamber having walls lying closely adjacent to said rolls, advancing the web in a number of back-and-forth passes over said rolls, maintaining within said chamber a controlled atmosphere of relatively high humidity and regulated temperature, pressing an endless felt against the web alternately on the exterior of said web as it passes over said rolls, and concurrently therewith maintaining said felt web wholly Within said chamber whereby said web has a relatively uniform moisture condition throughout its extent.
2. The method as set forth in claim 1, which further comprises: treating the web in successive stages in successive treatment chambers, and maintaining different controlled atmospheres in the different chambers.
References Cited bythe Examiner UNITED STATES PATENTS 2,337,163 12/43 Milne 34--116 2,344,686 3/44 Fanselow 34-18 2,661,669 12/53 Friedrich 34-13 3,079,699 6/63 Fry 34-116 FOREIGN PATENTS 564,356 9/ 44 Great Britain.
NORMAN YUDKOFF, Primary Examiner.

Claims (1)

1. THE METHOD OF UNIFORMLY MOISTENING A CONTINUOUS WEB OF PAPER OR SIMILAR HYGROSCOPIC MATERIAL, COMPRISING THE FOLLOWING STEPS; PROVIDING A CLOSED TREATMENT CHAMBER HAVING DISPOSED THEREIN A PLURALITY OF SPACED, ROTATABLE, COOLED ROLLS, SAID TREATMENT CHAMBER HAVING WALLS LYING CLOSELY ADJACENT TO SAID ROLLS, ADVANCING THE WEB IN A NUMBER OF BACK-AND-FORTH PASSES OVER SAID ROLLS, MAINTAINING WITHIN SAID CHAMBER A CONTROLLED ATMOSPHERE OF RELATIVELY HIGH HUMIDITY AND REGULATED TEMPERA-
US187991A 1961-04-17 1962-04-16 Method of uniformly moistening paper and like hygroscopic web material Expired - Lifetime US3191312A (en)

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Application Number Priority Date Filing Date Title
SE399961 1961-04-17

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GB (1) GB970676A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3753298A (en) * 1971-12-17 1973-08-21 Beloit Corp Web dryer
US3925906A (en) * 1972-08-14 1975-12-16 Beloit Corp Hot wire drying
FR2393616A1 (en) * 1977-06-06 1979-01-05 Bachofen & Meier Maschf PROCESS FOR THE HUMIDIFICATION, IMPREGNATION OR IMPROVEMENT OF A STRIP OF PAPER, CARDBOARD, SHEETS AND INSTALLATION FOR CARRYING OUT THIS PROCESS
DE4018882A1 (en) * 1990-06-13 1991-12-19 Voith Gmbh J M Paper-making drying section - has structured path for paper web and blankets between the guide rollers in a row between two banks of drying cylinders
US5291666A (en) * 1993-04-23 1994-03-08 International Paper Company Apparatus for drying roll material
US5588224A (en) * 1995-06-07 1996-12-31 Egs Americas, Inc. Chill roll assembly
US20060254735A1 (en) * 2003-03-31 2006-11-16 Katsumasa Ono Processes for producing cast coated papers and apparatus therefor
CN105239441A (en) * 2015-11-02 2016-01-13 江苏利特尔绿色包装股份有限公司 Three-roll-humidifying transfer device for paper rewetting

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1293565B (en) * 1964-12-11 1969-04-24 Wiessner Ges Fuer Raumluftgest Device for conditioning paper webs

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2337163A (en) * 1939-06-22 1943-12-21 Milne Samuel Hird Apparatus for conditioning paper
US2344686A (en) * 1941-06-28 1944-03-21 Paper Patents Co Paper drier and method
GB564356A (en) * 1942-12-19 1944-09-25 Hall & Kay Ltd An improved method of, and apparatus for, drying, and if desired also conditioning, paper in the continuous manufacture of same
US2661669A (en) * 1951-02-14 1953-12-08 Beckett Paper Company Process and apparatus for avoiding curl in machine-made paper
US3079699A (en) * 1958-10-27 1963-03-05 American Viscose Corp Web humidifying method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2337163A (en) * 1939-06-22 1943-12-21 Milne Samuel Hird Apparatus for conditioning paper
US2344686A (en) * 1941-06-28 1944-03-21 Paper Patents Co Paper drier and method
GB564356A (en) * 1942-12-19 1944-09-25 Hall & Kay Ltd An improved method of, and apparatus for, drying, and if desired also conditioning, paper in the continuous manufacture of same
US2661669A (en) * 1951-02-14 1953-12-08 Beckett Paper Company Process and apparatus for avoiding curl in machine-made paper
US3079699A (en) * 1958-10-27 1963-03-05 American Viscose Corp Web humidifying method

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3753298A (en) * 1971-12-17 1973-08-21 Beloit Corp Web dryer
US3925906A (en) * 1972-08-14 1975-12-16 Beloit Corp Hot wire drying
FR2393616A1 (en) * 1977-06-06 1979-01-05 Bachofen & Meier Maschf PROCESS FOR THE HUMIDIFICATION, IMPREGNATION OR IMPROVEMENT OF A STRIP OF PAPER, CARDBOARD, SHEETS AND INSTALLATION FOR CARRYING OUT THIS PROCESS
DE4018882A1 (en) * 1990-06-13 1991-12-19 Voith Gmbh J M Paper-making drying section - has structured path for paper web and blankets between the guide rollers in a row between two banks of drying cylinders
US5291666A (en) * 1993-04-23 1994-03-08 International Paper Company Apparatus for drying roll material
US5588224A (en) * 1995-06-07 1996-12-31 Egs Americas, Inc. Chill roll assembly
US20060254735A1 (en) * 2003-03-31 2006-11-16 Katsumasa Ono Processes for producing cast coated papers and apparatus therefor
US7699960B2 (en) * 2003-03-31 2010-04-20 Nippon Paper Industries Co., Ltd. Processes and apparatus for producing cast coated papers
CN105239441A (en) * 2015-11-02 2016-01-13 江苏利特尔绿色包装股份有限公司 Three-roll-humidifying transfer device for paper rewetting

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FI42267B (en) 1970-03-02
GB970676A (en) 1964-09-23

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