US3489592A - Method and device for coating or covering paper or sheet material with surface layers - Google Patents

Method and device for coating or covering paper or sheet material with surface layers Download PDF

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Publication number
US3489592A
US3489592A US54538366A US3489592A US 3489592 A US3489592 A US 3489592A US 54538366 A US54538366 A US 54538366A US 3489592 A US3489592 A US 3489592A
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United States
Prior art keywords
coating
blade
paper
sheet material
paper web
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Expired - Lifetime
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English (en)
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Hans Ivar Wallsten Fengersfors
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BILLINGSFORS LANGED AB
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BILLINGSFORS LANGED AB
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Classifications

    • 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
    • D21H23/40—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 only one side of the paper being in contact with the material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C3/00—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material
    • B05C3/02—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material
    • B05C3/12—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material for treating work of indefinite length
    • B05C3/125—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material for treating work of indefinite length the work being a web, band, strip or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C3/00—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material
    • B05C3/18—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material only one side of the work coming into contact with the liquid or other fluent material
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/80—Paper comprising more than one coating
    • D21H19/84—Paper comprising more than one coating on both sides of the substrate
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B05C11/04—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with blades

Definitions

  • the paper web When coating by means of rollers, e.g. in a sizing press or similar method, the paper web is caused to pass between two rollers, so-called coating rollers, which are urged towards each other.
  • the coating composition In the manufacture of doublesided coated paper the coating composition is usually applied on both sides of the paper web.
  • the surface layer of the base paper is not smoothed out to the same degree of smoothness as that achieved by means of a coating blade or knife.
  • the present invention intends to exploit the favourable effects of the blade coating method, i.e. optimal levelling ice of the unevenness of the surface of the base paper, while avoiding the disadvantages of the expensive coating stations associated with this method, by coating simultaneously the two sides of the paper web by means of a relatively simple arrangement, without the occurrence of film splitting.
  • the method can suitably be employed in coating directly in a paper machine as well as at a subsequent separate coating station.
  • the coating composition is applied on the two sides of the paper or sheet material, immediately in front of (viewed in the advancing direction of the sheet material) a press nip adapted to distribute and to apply the coating composition on both sides of the sheet material, said sheet material being passed through the press nip and between two pressing members of which at least one comprises a thin flexible blade shaped coating member.
  • a press nip adapted to distribute and to apply the coating composition on both sides of the sheet material, said sheet material being passed through the press nip and between two pressing members of which at least one comprises a thin flexible blade shaped coating member.
  • the sheet material, thus coated on both sides is suitably deflected at an angle to its travelling path through the press nip. It has been proved that in this way it is possible to avoid the above mentioned film-splitting eifect.
  • FIG. 1 relates to an embodiment having a blade-like coating member and a support member mounted opposite to said blade member on the opposite side of the sheet material, said support having a substantially flat support surface abutting the sheet material;
  • FIG. 2 shows details of FIG. 1 in a large scale
  • FIG. 3 shows a similar embodiment in which the sheet material after having passed through the press nip is deflected in the opposite direction to FIG. 2;
  • FIG. 4 illutrates an embodiment in which one blade member is replaced by a rotating cylinder
  • FIG. 5 illustrates a particular problem which can arise in conjunction with the invention.
  • the reference numeral 9 indicates a blade or a steel doctor knife of suitable thickness, the edge of which is pressed towards one side of the paper web 11, whilst the other side, opposite the blade 9, is supported against a substantially plain surface of a holding-on surface 10, which can consist of another blade but of larger thickness than the blade knife.
  • the paper web 11 is fed through the press nip defined by contact lines between the blades 9 and 10.
  • a coating composition 12 is passed on both sides of the paper web 11.
  • FIG. 2 shows details of FIG. 1 on a larger scale, and it can be seen how contact between the two blades 9 and 10 is eflected. Due to the relatively large thickness of the blade 10 with respect to the blade 9, a clearly defined contact line between the two blades can be obtained without difficulty, the paper web 11 being passed along said contact line.
  • the blade 10' has such a thickness that it is very rigid, even in the case with relatively high tensions in the paper web.
  • the paper web 11 is suitably deflected over the two edge lines 13 and 14, but even other means for guiding the paper web can be conceived.
  • the paper web can be curved against the edge 15 of the thinner blade 9, as shown in FIG. 3, or also passed straight on.
  • FIG. 1 Another embodiment of the invention is shown in FIG. 1
  • a thin flexible blade 9 is urged against the paper web 11 which is supported by a holding-on surface at the opposite side of said paper web at the same time as coating composition 12 is applied to both sides of said paper web 11.
  • the holding-on surface is not constituted of a blade but of a rotating cylinder or roller 16, and when the paper web 11a leaves the nip between the blade 9 and the holding-on roll 16 the web 11a is deflected against the side at which the blade 9 is located, or in other words the paper web 11 is deflected so that an angle a occurs between the tangent to the holding'on roller 16, through the point of contact, and the downward passing portion of the paper web 11.
  • the thin flexible blade 9 having a thickness of say about 0.30 mm., will form a dam on both sides of the paper web so that the coating composition or paste will be dammed up on each side of the paper web across the whole width thereof, said dams being defined on one side by the paper Web and the blade 9 and on the other side of the roller shell and the paper web. Laterally the dams are limited by suitable sealing means. In this manner the paper web will be coated simultaneously on both sides.
  • the paper web 11 will be perforated, and due to the movement of said web, will split or slit up, resulting in a break in the web.
  • the embodiment according to FIG. 4 as aforesaid possesses certain advantages. Because the holding-on roller 16 is constituted of a rotating roll, particles which possibly accompany the coating mixture are carried down to the press nip between the blade 9 and the paper web 11 when perforation of said paper web occurs, and the particle is carried by the paper web so as to prevent it from being scored. It should be pointed out that the number of revolutions of the roll 16 need not necessarily correspond to the speed of the paper web.
  • coating may successfully be elfected according to the invention in a paper machine in which the paper is pre-dried to a moisture content of between 20%.
  • a 0.30 mm. steel blade of the same quality as is usually used for blade-coating purposes may be used as a doctor blade, and a hardrubber roll having a hardness of approximately 30 P&] (that is, measured on the scale of the standard Perse and Jones testing method) may be used as a holding-on or counter pressure roll.
  • the thin blade is clamped in a blade holder and its free width measured from the edge of the doctor knife to the free edge of the blade is approximately 20 mm.
  • Paper of gram weights varying from 50 grams up to g./m. has been coated.
  • the coating compositions are based on aqueous China clay dispersions with synthetic and/ or natural binders, dispersing agents and other agents known within the coating technology.
  • a different coating mixture can possibly be used for different sides of the paper.
  • the sides of a base paper to be coated are dissimilar due to the fact that the side of the paper facing the Wire in the paper machine, the so called wire side, often has a lower surface uniformity than the opposite side, the so called upper side, inter alia due to markings obtained from the wire and the felts.
  • This is also applicable to crude paper of relatively high China clay content, the China clay tending to concentrate towards the upper side and thus further contributing towards said dissimilarity. Due to the new method, particularly in the embodiment according to FIG. 4 for example, it is possible to cause the blade 9 to coat the wire side of the paper, which contributes towards smoothing out the irregularities. A particularly even surface on the side of the crude paper 11 facing the blade 9 during the coating process is obtained in the embodiment according to FIG. 4.
  • a method of coating paper or other sheet material with surface layers by applying a coating composition to both sides of a travelling sheet by feeding the sheet between two opposed members defining a press nip immediately after applying the coating composition to distribute the coating composition evenly on both sides of the sheet, maintaining pressure in a thin line against both sides of the sheet as it passes through the press nip by using a resilient thin blade having a sharp edge engaging the sheet as one member of the press nip, the other member of the press nip being relatively rigid and supporting the sheet against pressure imposed by said one member.
  • a press nip having two opposed members on opposite sides of sheet material movable through the press nip after the application of coating material to both sides of the sheet material for distributing the coating material evenly on both sides of the sheet material, one member of the press nip being a resilient thin blade forming a thin sharp edge engaging the sheet material for maintaining line pressure against the sheet material, the other member of the press nip being more rigid than said one member and comprising a mainly flat supporting surface engaging one side of the sheet material under pressure imposed by said one member, and means for deflecting the sheet material at an angle to its direction of travel through the press nip substantially immediately after the sheet passes through the press nip to prevent film splitting.
  • a press nip having two opposed members adapted to press against both sides of the sheet material only along a single line of contact with said material immediately after the application of coating material to both sides of the sheet material for distributing the coating material evenly on both sides of the sheet material, one member of the press nip being a thin blade forming a thin sharp edge for engaging the sheet material to maintain line pressure against the sheet material, the other member being a rotary roller having a cylindrical surface adapted to contact the sheet material only along a line, and means for feeding sheet material References Cited UNITED STATES PATENTS 1,484,705 2/1924 Frothingham et al. 118-405 X 2,051,403 8/1936 Boyer et al.
  • Page 1, column 1, line 6 should include the statement:

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  • Paper (AREA)
  • Coating Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
US54538366 1965-04-27 1966-04-26 Method and device for coating or covering paper or sheet material with surface layers Expired - Lifetime US3489592A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE550765A SE301287B (sv) 1965-04-27 1965-04-27 Sätt och anordning för att överdraga en pappersbana eller ett arkmaterial med ett ytskikt

Publications (1)

Publication Number Publication Date
US3489592A true US3489592A (en) 1970-01-13

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Family Applications (1)

Application Number Title Priority Date Filing Date
US54538366 Expired - Lifetime US3489592A (en) 1965-04-27 1966-04-26 Method and device for coating or covering paper or sheet material with surface layers

Country Status (10)

Country Link
US (1) US3489592A (fi)
AT (1) AT307866B (fi)
BE (1) BE680183A (fi)
CH (1) CH433947A (fi)
DE (1) DE1696153C3 (fi)
FI (1) FI51622C (fi)
GB (1) GB1115133A (fi)
NL (1) NL158093B (fi)
NO (1) NO119968B (fi)
SE (1) SE301287B (fi)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2310526A1 (de) * 1972-03-13 1973-09-27 Inventing Ab Verfahren zum gleichzeitigen und beidseitigen beschichten einer materialbahn mit unterschiedlichen beschichtungsmitteln
US3889018A (en) * 1973-03-16 1975-06-10 Ethyl Corp Method of simultaneously coating the opposite sides of a paper web
US4154899A (en) * 1971-11-05 1979-05-15 Potlatch Forests, Inc. Production of porous, smooth, coated paper using high solids water-based coating compositions in blade coating apparatus
DE2915300A1 (de) * 1979-04-24 1980-10-16 Inventing Ab Verfahren zum beidseitigen aufbringen eines strichs auf eine bewegte papierbahn
US4233930A (en) * 1978-10-16 1980-11-18 Jagenberg-Werke Aktiengesellschaft Apparatus for the continuous and simultaneous application of coatings of constant thickness to both sides of a web
US4357370A (en) * 1981-03-27 1982-11-02 Beloit Corporation Twin short dwell coater arrangement
US4358481A (en) * 1980-06-10 1982-11-09 Inventing S.A. Method and apparatus for coating both sides of a moving web
US4363289A (en) * 1979-10-02 1982-12-14 Firma Ernst Harlacher Printing screen coating method and apparatus
WO2009008820A1 (en) * 2007-07-09 2009-01-15 Mattssonföretagen I Uddevalla Aktiebolag Coating device for two-sided coating of paper or paperboard

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI72903C (fi) * 1984-04-17 1987-08-10 Ahlstroem Oy Foerfarande och anordning foer bestrykning av bana.
DE102011110609A1 (de) * 2011-08-18 2013-02-21 Lts Lohmann Therapie-Systeme Ag Vorrichtung für die Beschichtung von bahnförmigen Materialien

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1484705A (en) * 1921-10-27 1924-02-26 Daniel D Frothingham Machine for and method of coating fabrics
US2051403A (en) * 1930-07-16 1936-08-18 Warren S D Co Paper coating
US2855895A (en) * 1954-12-22 1958-10-14 Champion Paper & Fibre Co Apparatus for coating paper
FR1308186A (fr) * 1961-12-14 1962-11-03 Bruderhaus Maschinen Gmbh Procédé pour appliquer un enduit ou composition similaire sur une bande de papier ou analogue

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1484705A (en) * 1921-10-27 1924-02-26 Daniel D Frothingham Machine for and method of coating fabrics
US2051403A (en) * 1930-07-16 1936-08-18 Warren S D Co Paper coating
US2855895A (en) * 1954-12-22 1958-10-14 Champion Paper & Fibre Co Apparatus for coating paper
FR1308186A (fr) * 1961-12-14 1962-11-03 Bruderhaus Maschinen Gmbh Procédé pour appliquer un enduit ou composition similaire sur une bande de papier ou analogue

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4154899A (en) * 1971-11-05 1979-05-15 Potlatch Forests, Inc. Production of porous, smooth, coated paper using high solids water-based coating compositions in blade coating apparatus
DE2310526A1 (de) * 1972-03-13 1973-09-27 Inventing Ab Verfahren zum gleichzeitigen und beidseitigen beschichten einer materialbahn mit unterschiedlichen beschichtungsmitteln
US3899615A (en) * 1972-03-13 1975-08-12 Inventing Ab Method of coating paper or other sheet material with surface layers of different coating compositions
US3889018A (en) * 1973-03-16 1975-06-10 Ethyl Corp Method of simultaneously coating the opposite sides of a paper web
US4233930A (en) * 1978-10-16 1980-11-18 Jagenberg-Werke Aktiengesellschaft Apparatus for the continuous and simultaneous application of coatings of constant thickness to both sides of a web
DE2915300A1 (de) * 1979-04-24 1980-10-16 Inventing Ab Verfahren zum beidseitigen aufbringen eines strichs auf eine bewegte papierbahn
US4288473A (en) * 1979-04-24 1981-09-08 Inventing S.A. Process for applying a coating to both sides of a running paper web
US4363289A (en) * 1979-10-02 1982-12-14 Firma Ernst Harlacher Printing screen coating method and apparatus
US4358481A (en) * 1980-06-10 1982-11-09 Inventing S.A. Method and apparatus for coating both sides of a moving web
US4357370A (en) * 1981-03-27 1982-11-02 Beloit Corporation Twin short dwell coater arrangement
WO2009008820A1 (en) * 2007-07-09 2009-01-15 Mattssonföretagen I Uddevalla Aktiebolag Coating device for two-sided coating of paper or paperboard

Also Published As

Publication number Publication date
NL6605649A (fi) 1966-10-28
DE1696153C3 (de) 1978-04-27
NL158093B (nl) 1978-10-16
GB1115133A (en) 1968-05-29
CH433947A (de) 1967-04-15
SE301287B (sv) 1968-05-27
DE1696153B2 (de) 1974-01-03
NO119968B (fi) 1970-08-03
DE1696153A1 (de) 1972-01-13
BE680183A (fi) 1966-10-03
FI51622B (fi) 1976-11-01
AT307866B (de) 1973-06-12
FI51622C (fi) 1977-02-10

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