EP0272996B1 - A coating apparatus - Google Patents

A coating apparatus Download PDF

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Publication number
EP0272996B1
EP0272996B1 EP87630251A EP87630251A EP0272996B1 EP 0272996 B1 EP0272996 B1 EP 0272996B1 EP 87630251 A EP87630251 A EP 87630251A EP 87630251 A EP87630251 A EP 87630251A EP 0272996 B1 EP0272996 B1 EP 0272996B1
Authority
EP
European Patent Office
Prior art keywords
roll
nip
applicator
web
backing
Prior art date
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
EP87630251A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0272996A1 (en
Inventor
Haruyoshi Fujiwara
Toshihiro Toyofuku
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.)
Beloit Corp
Original Assignee
Beloit Corp
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 Beloit Corp filed Critical Beloit Corp
Publication of EP0272996A1 publication Critical patent/EP0272996A1/en
Application granted granted Critical
Publication of EP0272996B1 publication Critical patent/EP0272996B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
    • D21H23/56—Rolls
    • 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
    • D21H5/0025—Processes or apparatus specially adapted for applying liquids or other fluent materials to finished paper or board, e.g. impregnating, coating by contact with a device carrying the treating material
    • D21H5/003—Processes or apparatus specially adapted for applying liquids or other fluent materials to finished paper or board, e.g. impregnating, coating by contact with a device carrying the treating material with a roller

Definitions

  • This invention relates to a coating apparatus and method for applying a coating material to a paper web.
  • an applicator roll disposed within a coater pan has been proposed.
  • the applicator roll counter-rotates relative to a backing roll such that coating material within the pan is carried by the applicator roll towards an application zone, or gap, disposed between the applicator roll and the backing roll.
  • the prior art proposal includes a coating shoe which separates the coating material into two flow paths.
  • the first flow path guides coating material between the shoe and the web extending around the backing roll.
  • the second flow path follows the surface of the applicator roll. Excess coating material from the first flow path overflows through an overflow pipe and is recirculated.
  • the gap between the applicator roll and the web extending around the backing roll ranges from 0.2 to 0.5 millimeters and the applicator roll usually rotates at a speed which is 10 to 20 percent less than the speed of the web.
  • US-A-3 175 532 there is described a coating apparatus according to the preamble of claim 1. More specifically, US-A-3 175 532 shows a coating apparatus comprising a backing roll, an applicator roll cooperating with backing roll for defining therebetween a gap for the passage therethrough of the web, the applicator and backing rolls counter-rotating at given speeds. A roll movably cooperating with the backing roll defines therebetweeen a nip section disposed downstream relative to the gap.
  • the apparatus described in US-A-3 175 532 utilizes a smoothing roll which is in contact with the web in proximity of the backing roll. Pressure is applied to the coated web by the smoothing roll by means of hydraulic cylinders and pistons.
  • a method of applying a coating material to the surface of a paper web according to the preamble of claim 11 is also known from US-A-3 175 532.
  • BE-A-725 175 is directed to an apparatus similar to that shown in the aforementioned US-A-3,175 532.
  • a smoothing roll is brought into contact with the web when it extends around the backing roll.
  • coated film thicknesses applied to the paper web have been in the order of 200 to 300 microns and the final film thickness after scraping the excess coating material from the web was about 20 microns.
  • the outer surface of the coating material downstream relative to the gap and prior to removal of excess coating material by a blade constitutes an unstable, free boundary surface due to a negative pressure produced therein. Accordingly, pressure variations exist in a cross-machine direction along the width of the roll which result in the formation of coating patterns of the coating material. These coating patterns include longitudinal stripes which include a wavy, lateral cross-sectional configuration.
  • the foregoing striped coating patterns generated by the prior art blade type coaters have reduced the quality of the resultant coated paper webs.
  • Such coated webs not only include streaks but also split marks.
  • the aforementioned free boundary surface is unavoidable in coaters employing two rolls. More specifically, the aforementioned striped coating pattern is caused by pressure variations in a cross-machine direction in the coating material at the aforementioned gap, or nip section. These pressure variations often result from air entrapped within the nip section.
  • the coating apparatus of the invention is characterized by the features set forth in the characterizing portion of claim 1 and the method of the invention is characterized by the features of claim 11.
  • the roll cooperating with the backing roll to define the nip section therebetween is a nip roll riding on the applicator roll so that the coating material is applied to the surface of the web during passage of the web through the gap and nip section.
  • a specific feature of the present invention is the provision of a coating apparatus in which the gap between the backing roll and the applicator roll is variable.
  • Another feature of the present invention is the provision of a coater apparatus in which a coater pan for the reception therein of coating material defines an opening such that the applicator roll is partially disposed within the pan so that when the applicator roll is rotated, the coating material within the pan is carried by the applicator roll from the pan towards the gap and nip section.
  • Another feature of the present invention is the provision of a coating apparatus which includes means for moving the pan towards the backing roll.
  • Another feature of the present invention is the provision of a coating apparatus in which an arm means rotatably supports a rotatable nip roll such that the nip roll rides on the applicator roll.
  • Another feature of the present invention is the provision of a coating apparatus in which the nip roll is rotated by means of power means such that the nip roll rotates in the same direction of rotation as the applicator roll for applying a smooth layer of the coating material onto the web during passage of the web through the nip section, the nip roll being rotated at a speed of rotation such that accumulation of coating material thereon is inhibited.
  • Another feature of the present invention is the provision of a coating apparatus in which the diameter of the nip roll is less than the diameter of the applicator roll and the backing roll such that during passage of the web through the nip section, the nip pressure applied between the nip roll and the backing roll is sufficient to cause penetration of the web and the resultant staining of the backing roll.
  • the present invention relates to a coating apparatus and method for applying a coating material to the surface of a paper web.
  • the apparatus includes a backing roll and an applicator roll cooperating with the backing roll for defining therebetween a gap for the passage therethrough of the web.
  • the backing roll and the applicator roll counter-rotate at given speeds and a nip roll movably cooperates with the backing roll for defining therebetween a nip section.
  • the nip section is disposed downstream relative to the gap such that the web extends progressively through the gap and through the nip section so that the coating material is applied to the surface of the web during passage of the web through the gap and nip section.
  • the coating apparatus also includes a frame with the frame rotatably supporting the backing roll.
  • the applicator roll is movable relative to the backing roll such that the gab between the backing roll and the applicator roll is variable.
  • the coating apparatus also includes a coater pan for the reception therein of coating material.
  • the pan defines an opening such that the applicator roll is rotatably-disposed within the pan so that when the applicator roll is rotated, the coating material within the pan is carried by the applicator roll from the pan towards the gap and nip section.
  • the coating apparatus also includes moving means which is disposed between the frame and the pan for moving the pan towards the backing roll. More particularly, the moving means is an air cushion.
  • the coating apparatus further includes arm means having proximal and distal ends.
  • the proximal end of the arm means is pivotally-secured to the frame and the distal end rotatably supports the nip roll such that the nip roll rides on the applicator roll.
  • the coating apparatus includes power means for rotating the nip roll relative to the arm means such that the nip roll rotates in the same direction of rotation as the applicator roll for applying a smooth layer of coating material onto the web during passage of the web through the nip section.
  • the nip roll is rotated at a speed of rotation such that accumulation of coating material thereon is inhibited.
  • the nip roll has a diameter which is less than the diameter of the applicator roll and the backing roll such that during passage of the web through the nip section, the nip pressure applied between the nip roll and the backing roll is insufficient to cause penetration of the web and the resultant staining of the backing roll.
  • the method includes the steps of rotating the applicator roll in the pan containing the coating material.
  • the coating material is carried by the applicator roll towards the gap defined between the applicator roll and the backing roll.
  • a nip roll is rotated in the same direction of rotation as the applicator roll with the nip roll riding on the applicator roll such that a smooth layer of coating material is applied to the surface of the web as the web extends between a nip section defined between the rotating nip roll and the cooperating backing roll.
  • Figure 1 is a side-elevational view of a prior art coater apparatus which includes a rotatable backing roll 1 which cooperates with a rotatable applicator roll 2, the applicator roll 2 rotating in an opposite direction of rotation relative to the backing roll 1.
  • a coater pan 3 houses the applicator roll 2 such that on rotation of the applicator roll 2 within the pan 3, coating material 5 within the pan 3 is carried by the applicator roll 2 towards a gap G defined between the backing roll 1 and the applicator roll 2.
  • a nip section NS is disposed downstream relative to the gap G with the nip section NS being defined between a shoe S and the backing roll 1.
  • the shoe S defines a split point P which divides the coating material 5 into two flow paths FP1 and FP2 respectively.
  • Flow path FP1 flows through the nip section NS such that the coating material 5 is pressed between the shoe S and the web 6.
  • a blade 4 scrapes excess coating material from the surface of the web 6 such that the excess coating material is fed through piping 7 and recirculated via pipe 8 into the coater pan 3.
  • the second flow path FP2 follows the applicator roll 2 so that coating material 5 is recirculated through the coater pan 3. Coating material 5 overflowing from the coater pan 3 upstream relative to the gap is also recirculated through piping 7 for recirculation to the coater pan 3.
  • Figure 2 is an explanatory drawing showing the wedge pressure distribution of the prior art apparatus of figure 1 as indicated by the line WPD.
  • Figure 3 is a sectional view taken on the line 3-3 of figure 1 showing the application of the coating material 5 to the web 6 and the resultant staining 44 of the backing roll 1.
  • Figures 4 to 8 show a coating apparatus generally designated 10 according to the present invention for applying a coating material to the surface of a paper web.
  • the coating apparatus 10 includes a backing roll 12 and an applicator roll 14 which cooperates with the backing roll 12 for defining therebetween a gap G1 for the passage therethrough of the web 16.
  • the backing roll 12 and the applicator roll 14 counter-rotate at given speeds and a nip roll 18 movably cooperates with the backing roll 12 for defining therebetween a nip section NS1 as shown particularly in figure 7.
  • the nip section NS1 is disposed downstream relative to the gap G1 such that the web 16 extends progressively through the gap G1 and through the nip section NS1 so that the coating material 20 is applied to the surface of the web 16 during passage of the web 16 through the gap G1 and nip section NS1.
  • the coating apparatus 10 includes a frame 22 with the frame 22 rotatably supporting the backing roll 12.
  • the applicator roll 14 is movable relative to the backing roll 12 such that the gap G1 between the backing roll 12 and the applicator roll 14 is variable.
  • the apparatus 10 also includes a coater pan 24 for the reception therein of the coating material 20.
  • the pan 24 defines an opening 26 such that the applicator roll 14 is rotatably-disposed within the pan 24 so that when the applicator roll 14 is rotated, as shown by the arrow 27, the coating material 20 within the pan 24 is carried by the applicator roll 14 from the pan 24 towards the gap G1 and nip section NS1.
  • the apparatus 10 further includes moving means genrally designated 28 disposed between the frame 22 and the pan 24 for moving the pan 24 towards the backing roll 12.
  • the moving means 28 is an air cushion 30.
  • the coating apparatus 10 includes arm means generally designated 32 having a proximal and distal end 34 and 36 respectively.
  • the proximal end 34 is pivotally-secured at 38 to the frame 22 while the distal end 36 rotatably supports the nip roll 18 as shown in figure 6 such that the nip roll 18 rides on the applicator roll 14.
  • power means generally designated 40 rotate the nip roll 18 relative to the arm means 32 so that the nip roll 18 rotates in the same direction of rotation as the applicator roll 14 for applying a smooth layer of the coating material 20 onto the web 16 during passage of the web 16 through the nip section NS1.
  • the nip roll 18 is rotated at a speed of rotation such that accumulation of coating material thereon is inhibited.
  • the nip roll 18 as shown particularly in figure 5 has a diameter which is less than the diameter of the applicator roll 14 and the backing roll 12 such that during passage of the web 16 through the nip section NS1, the nip pressure applied between the nip roll 18 and the backing roll 12 is insufficient to cause penetration of the web 16 and the resultant problem of staining of the backing roll 12.
  • figure 7 is a cross-sectional view of a portion surrounding the nip section NS1 in a coating apparatus embodying the present invention, where the backing roll 12, the applicator roll 14, the coater pan 24, the coating material 20 and the web 16 are similar to the corresponding elements shown in the prior art proposal shown in figure 1.
  • the nip roll 18 is disposed near the nip section NS1 downstream relative to the gap G1. Additionally, the nip roll 18 is rotated at a speed suitable for preventing accumulation of the coating material thereon.
  • the nip roll 18 as shown in figure 6 is supported by arms 46 and 48 which protrude from the frame 22 so that the nip roll 18 can move between the backing roll 12 and the applicator roll 14.
  • the nip roll 18 can be driven through bearings 50 and 52 respectively, by a small capacity motor 40.
  • the arrangement as described is given by way of example. It will be appreciated by those skilled in the art that the nip roll 18 may be driven by various means.
  • the arms 46 and 48 can be moved as indicated by the arrow 54 as shown in figure 4.
  • the present invention has the advantage that the absolute value of the nipping pressure or wedge pressure distribution as indicated by the line NPD1 is lowered below the value in the prior art proposals by reducing the diameter of the nip roll 18 in order to process adequately coating material 20 having a high viscosity thereby inhibiting penetration and resultant staining of the backing roll 12.
  • the distance between the nip roll 18 and the backing roll 12 can be adjusted by a control system (not shown) well known in the art.
  • the aforementioned distance is adjusted for a given value by means of a sensing device generally designated 56 secured to a bracket.
  • Such sensing device 56 cooperates with the coater pan 24 enabling vertical movement of the coater pan 24 by operation of the air cushion 30 mounted on bracket 58 installed on the frame 22 as shown in figure 4.
  • the coating material 20 is lifted up by the applicator roll 14 so that the coating material 20 contacts the paper web 16 at a location which is near to the centerline 60 of the backing roll 12 and the applicator roll 14.
  • the nipping pressure starts to build up from the contact position 62 and maintains a low absolute value in the region of the nip roll 18.
  • the nip width in the region NS1 is narrower than in the prior art proposals owing to the small diameter of the nip roll 18. Consequently, the nipping pressure could be lowered in absolute values for the same type of coating material. This means that the invention provides effective means for processing a coating material liable to stain the backing roll 12 by penetration through the web 16.
  • the coating materials 20 can be applied to webs with the amount of penetration maintained at a minimum so that a coated web may be manufactured which exhibits excellent printing qualities. Additionally, surface irregularities of the coating liquid film in the radial direction of the roll at the point P is inhibited -- or at least reduced so that the striping or coating pattern can be minimized.
  • the present invention provides a coating apparatus which avoids the prior art problems of striping and streaking shown in figure 3. Further, the wedge pressure can be controlled by the nip roll 18 which can be set in an arbitrary position between the backing roll 12 and the applicator roll 14. Thus, the quality of coated paper webs can be improved by the utilization of proper nipping conditions according to the type of coating material and webs being used.

Landscapes

  • Coating Apparatus (AREA)
  • Paper (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
EP87630251A 1986-11-28 1987-11-23 A coating apparatus Expired - Lifetime EP0272996B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP61283184A JPH0677709B2 (ja) 1986-11-28 1986-11-28 転写装置
JP283184/86 1986-11-28

Publications (2)

Publication Number Publication Date
EP0272996A1 EP0272996A1 (en) 1988-06-29
EP0272996B1 true EP0272996B1 (en) 1993-01-27

Family

ID=17662220

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87630251A Expired - Lifetime EP0272996B1 (en) 1986-11-28 1987-11-23 A coating apparatus

Country Status (14)

Country Link
EP (1) EP0272996B1 (ko)
JP (1) JPH0677709B2 (ko)
KR (1) KR930011952B1 (ko)
CN (1) CN1009440B (ko)
AR (1) AR246572A1 (ko)
BR (1) BR8706363A (ko)
CA (1) CA1264615A (ko)
DE (1) DE3783894T2 (ko)
ES (1) ES2037737T3 (ko)
FI (1) FI92021C (ko)
IN (1) IN168498B (ko)
MX (1) MX172055B (ko)
PH (1) PH25198A (ko)
PL (1) PL159717B1 (ko)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4013319A1 (de) * 1990-04-26 1991-10-31 Pagendarm Gmbh Vorrichtung zum auftragen einer schicht auf eine substratbahn
FI86318C (fi) * 1990-06-26 1992-08-10 Keskuslaboratorio Foerfarande och anordning foer att reglera bladbestrykning.
DE4224726A1 (de) * 1992-07-27 1994-02-03 Voith Gmbh J M Streicheinrichtung mit zwischen einer Auftragswalze und einer Gegenwalze gebildetem Auftragsspalt
JP2883581B2 (ja) * 1996-06-17 1999-04-19 東亜機工株式会社 サニタリー製品製造設備
FI123582B (fi) * 2010-04-29 2013-07-31 Metso Paper Inc Menetelmä ja laitteisto kuiturainan käsittelemiseksi
CN101879806A (zh) * 2010-06-21 2010-11-10 苏州康尼包装材料有限公司 气泡膜成型装置
CN102784745B (zh) * 2012-08-06 2015-08-19 昆山微容电子企业有限公司 自动涂装机的溢粉回收系统
DE202014103256U1 (de) * 2014-07-15 2014-07-23 Valmet Technologies, Inc. Belastungsvorrichtung für eine Maschine zur Herstellung von Faserbahnen
CN111701792B (zh) * 2020-06-17 2021-04-23 衡阳师范学院 一种更加平稳的油画基底涂覆机

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3000760A (en) * 1957-06-28 1961-09-19 Eastman Kodak Co Method and apparatus for coating a surface
FR82248E (fr) * 1959-09-25 1964-01-10 Beloit Iron Works Mécanisme destiné à appliquer un enduit à une bande de papier en mouvement
US3175532A (en) * 1960-04-14 1965-03-30 Combined Locks Paper Co Roller apparatus for coating paper web
US3245377A (en) * 1962-06-20 1966-04-12 Kimberly Clark Co Apparatus for coating paper
US3496012A (en) * 1967-02-13 1970-02-17 Mead Corp Coating apparatus and method
BE725175A (ko) * 1967-12-11 1969-05-16
JPS6032400U (ja) * 1983-08-12 1985-03-05 三菱重工業株式会社 コ−タ給液装置

Also Published As

Publication number Publication date
PH25198A (en) 1991-03-27
DE3783894D1 (de) 1993-03-11
FI92021C (fi) 1994-09-26
KR930011952B1 (ko) 1993-12-22
AR246572A1 (es) 1994-08-31
CN1009440B (zh) 1990-09-05
DE3783894T2 (de) 1993-06-03
MX172055B (es) 1993-12-01
FI875230A0 (fi) 1987-11-27
IN168498B (ko) 1991-04-13
KR880006420A (ko) 1988-07-22
BR8706363A (pt) 1988-07-26
JPH0677709B2 (ja) 1994-10-05
PL159717B1 (pl) 1993-01-29
CA1264615A (en) 1990-01-23
ES2037737T3 (es) 1993-07-01
CN87107986A (zh) 1988-07-06
PL269092A1 (en) 1988-08-18
EP0272996A1 (en) 1988-06-29
JPS63137766A (ja) 1988-06-09
FI875230A (fi) 1988-05-29
FI92021B (fi) 1994-06-15

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