EP0896086A2 - Funktionelle Epoxysiliconbeschichtungen für Gewebe zur Bespannung von Papiermaschinen und das Beschichtungsverfahren - Google Patents

Funktionelle Epoxysiliconbeschichtungen für Gewebe zur Bespannung von Papiermaschinen und das Beschichtungsverfahren Download PDF

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Publication number
EP0896086A2
EP0896086A2 EP98202079A EP98202079A EP0896086A2 EP 0896086 A2 EP0896086 A2 EP 0896086A2 EP 98202079 A EP98202079 A EP 98202079A EP 98202079 A EP98202079 A EP 98202079A EP 0896086 A2 EP0896086 A2 EP 0896086A2
Authority
EP
European Patent Office
Prior art keywords
coating
fabric
clothing
set forth
mass
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.)
Withdrawn
Application number
EP98202079A
Other languages
English (en)
French (fr)
Other versions
EP0896086A3 (de
Inventor
Bryan Casteel
Aaron Bumgarner
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.)
Albany International Corp
Original Assignee
Albany International 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 Albany International Corp filed Critical Albany International Corp
Publication of EP0896086A2 publication Critical patent/EP0896086A2/de
Publication of EP0896086A3 publication Critical patent/EP0896086A3/de
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
    • D06N3/12—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins
    • D06N3/128—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins with silicon polymers
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/0027—Screen-cloths
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/30—Protecting wire-cloths from mechanical damage

Definitions

  • the present invention is directed to fabrics for paper making machines that are rendered contamination resistant by a durable coating that lasts the entire life of the fabric, while not overly limiting the permeability of the fabric.
  • the modern papermaker employs a highly sophisticated papermaking machine which is in essence a device for removing water from the paper furnish.
  • the water is removed sequentially in three stages or sections of the machine.
  • the furnish is deposited on a moving forming fabric and water drained through the fabric to leave a paper sheet or web having a solids content of about 18 to 25 percent by weight.
  • the formed web is carried into a press fabric section and passed through one or more nip presses on a moving press fabric to remove sufficient water to form a sheet having a solids content of about 36 to 50 percent by weight.
  • This sheet is then transferred to the dryer section of the papermaking machine where dryer fabrics hold the paper sheet against hot, steam-heated dryer cylinders to obtain about 92 to 96 percent solids content.
  • the papermaking fabrics employed on the papermaking machine must perform a diverse range of functions, according to the position on the machine, i.e., forming, press or dryer section.
  • Forming fabrics used in the papermaking process are a kind of papermaking fabric which are used in the forming section of a papermaking machine.
  • Forming fabrics are generally constructed of synthetic yarns joined together, ordinarily by weaving, in a fabric construction that is characterized by a high degree of open spaces between the intersecting yarns.
  • Forming fabrics must maintain a high degree of openness to insure that they permit removal of water from the fiber slurry deposited thereon.
  • U.S. Patent nos. 5,207,873 and 5,395,868 describe papermaking fabrics claimed to have permanent resistance to adhesion of contaminants.
  • the fabrics are coated with solutions having as their primary components tetrafluoroethylene, urethane copolymer and polyacrylamide. This coating has not proven to be totally effective and/or permanent on paper machine clothing.
  • An object of the present invention is to provide a fabric used in the forming, pressing, or drying section of a paper making machine that exhibits an improved resistance to contamination over the entire life of the fabric.
  • These fabrics are referred to as papermachine clothings by those skilled in the art, and the terms are generally interchangeable.
  • the present invention is a coated fabric used in a papermaking machine that has significantly enhanced resistance to contamination which lasts over the entire fabric lifetime.
  • the invention is a method of coating a fabric used in a papermaking machine in order to enhance its resistance to contamination.
  • the coating formulations disclosed herein have been shown to substantially improve the contamination resistance of a fabric while not significantly reducing the permeability of the fabric, and not increasing the mass of the fabric to any significant degree. That is, the present invention provides a thin, low weight coating for a papermachine clothings that adds limited mass to the fabric.
  • a coating comprised of a silicon-epoxy resin will render a paper machine clothing contamination resistant over the entire fabric lifetime.
  • Suitable silicon-epoxy coatings include aqueous mixtures that contain silicone epoxy resins. It is believed that the silicone-epoxy resins bond with the polyester or nylon filaments that form the clothing.
  • a suitable line of silicone-epoxy resin compositions are available from Decora Industries, Fort Edward, New York under the trade name Wearlon®.
  • a preferred formulation is Wearlon® 2020-98, a three component formulation of a resin containing a silicone-epoxy based emulsion, a curing agent and a crosslinking agent. The components are mixed in-situ in accordance with the manufacturer's recommendations and applied to the fabrics and can be further diluted as necessary.
  • Effective contamination resistant fabrics have been prepared where the fabric coating formulation contains 5% to about 50% solids on a weight-weight basis, with a mass add-on of 0.1 % to 10.0 % based on the weight of the uncoated fabric.
  • the % mass add on is:
  • a greater degree of the original permeability of a coated fabric is retained when the solids content of the coating or mass add on of the coating is reduced.
  • Water a preferred diluent for aqueous based coatings, may be used to reduce solids content and consequently % mass add on. It has been found that fabrics having coating formulations of a solids content in the range of 10% to 15 % (w/w) or a mass add on of 1% to 3% maintain a high degree of their original permeability. That is, on the order of about 90% - 99% of their original permeability, which is preferred. In other words, permeability is reduced only about 1% - 10% as a result of the coating.
  • the fabrics can be coated in any conventional manner, including immersion within a coating bath, blade or bar coating techniques, squeegee coating, transfer coating, spray application, kiss or applicator roll, slot applicator, and brush applicator. Application with a kiss roll has been effective.
  • the coating can be applied in a single pass, or it may be applied in multiple passes. Subsequent processing requires removing excess material and then drying or curing the coating as directed by the manufacture of that particular material. These methods are well known by those skilled in the art.
  • a triple layer forming fabric constructed of polyester filaments was coated on part of, but not all of its surface with a an aqueous solution of WEARLON® 2020-98 silicon-epoxy coating (49% solids w/w) available from Decora Industries, Inc. of Fort Edward, N.Y.
  • the coating formulation was applied in a single layer with a Binks #7 spray gun available from Binks Mfg. Co. of Franklin Park, Illinois. Excess liquid was removed with a vacuum. Mass add on was determined as 8.3% based on the weight of the uncoated fabric. Portions of the belt were not coated in order to serve as a control.
  • the fabric was installed on a pilot machine and run for 3 days.
  • the machine was running pulp consisting of 100% old corrugated container (OCC).
  • OOC old corrugated container
  • the speed of the machine ranged from 460-670 m/min (1500-2200 ft/min). Needle showers were used at 13.8 bars (200 psi) with no cleaning chemicals.
  • the fabric was removed and analyzed. The following figures relate to the appearance and condition of the fabric after removal.
  • Figures 1 and 3 are photographs taken at 5X magnification of each section.
  • the pictures were then scanned into the computer with a gray color scale.
  • the image was converted to a bitmap file (* bmp file), and opened in Microsoft Paintbrush (see Figs. 2 and 4), and the contaminants were colored in blue.
  • the gray fabric was removed from the image leaving only the blue portion. This image was then imported into an image analysis program which counted the blue pixels and found a % contaminated area. The results are listed below:
  • Silicone epoxy coating formulations of WEARLON® 2020-98 were applied to fabrics at solids content ranging from 5% to 25% (w/w). Three coats were applied to a triple layer fabric via kiss roll applicator. The compositions of the formulations are provided in Table 1.
  • Nozzle were spaced 1" apart across the length of the shower arm for uniform coverage.
  • Table 3 is based on the data of Table 2.
  • Table 3 expresses the data of Table 2 in terms of the changes in air permeability and mass add-on between the uncoated fabrics and the coated fabrics exposed to high pressure showering. Since the air permeability and mass add on of the showered, coated fabrics never return to the original levels of uncoated fabrics, it is evident that the coatings remain after exposure to the high pressure showering.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
  • Paper (AREA)
  • Laminated Bodies (AREA)
EP98202079A 1997-08-08 1998-06-23 Funktionelle Epoxysiliconbeschichtungen für Gewebe zur Bespannung von Papiermaschinen und das Beschichtungsverfahren Withdrawn EP0896086A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US908556 1986-09-18
US90855697A 1997-08-08 1997-08-08

Publications (2)

Publication Number Publication Date
EP0896086A2 true EP0896086A2 (de) 1999-02-10
EP0896086A3 EP0896086A3 (de) 1999-10-13

Family

ID=25425972

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98202079A Withdrawn EP0896086A3 (de) 1997-08-08 1998-06-23 Funktionelle Epoxysiliconbeschichtungen für Gewebe zur Bespannung von Papiermaschinen und das Beschichtungsverfahren

Country Status (10)

Country Link
EP (1) EP0896086A3 (de)
JP (1) JPH11172593A (de)
KR (1) KR19990023136A (de)
CN (1) CN1210172A (de)
AU (1) AU6059098A (de)
BR (1) BR9802355A (de)
CA (1) CA2245274A1 (de)
ID (1) ID20663A (de)
NO (1) NO983619L (de)
ZA (1) ZA982563B (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4522212B2 (ja) * 2004-09-29 2010-08-11 イチカワ株式会社 抄紙搬送フェルトおよび該抄紙搬送フェルトを備えた抄紙機のプレス装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57171790A (en) * 1980-12-06 1982-10-22 Nihon Felt Kk Papermaking cloth having anti-stain property
US5002801A (en) * 1988-10-31 1991-03-26 Albany International Corp. Paper machine fabrics having controlled release
US5207873A (en) * 1992-04-17 1993-05-04 Huyck Corporation Anti-contaminant treatment for papermaking fabrics

Also Published As

Publication number Publication date
EP0896086A3 (de) 1999-10-13
NO983619L (no) 1999-02-09
CN1210172A (zh) 1999-03-10
NO983619D0 (no) 1998-08-06
KR19990023136A (ko) 1999-03-25
ID20663A (id) 1999-02-11
ZA982563B (en) 1998-10-08
BR9802355A (pt) 1999-12-28
CA2245274A1 (en) 1999-02-08
AU6059098A (en) 1999-03-11
JPH11172593A (ja) 1999-06-29

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