US3518105A - Panel-treating process - Google Patents

Panel-treating process Download PDF

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Publication number
US3518105A
US3518105A US798387A US3518105DA US3518105A US 3518105 A US3518105 A US 3518105A US 798387 A US798387 A US 798387A US 3518105D A US3518105D A US 3518105DA US 3518105 A US3518105 A US 3518105A
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US
United States
Prior art keywords
coating
water
panel
flame
smoothing
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
US798387A
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English (en)
Inventor
Clifford T Mcelroy
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.)
CLIFFORD T MCELROY
Original Assignee
CLIFFORD T MCELROY
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 CLIFFORD T MCELROY filed Critical CLIFFORD T MCELROY
Application granted granted Critical
Publication of US3518105A publication Critical patent/US3518105A/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
    • D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
    • D21J1/00—Fibreboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/08—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by flames
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2203/00—Other substrates
    • B05D2203/20—Wood or similar material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2203/00—Other substrates
    • B05D2203/22—Paper or cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2252/00—Sheets
    • B05D2252/04—Sheets of definite length in a continuous process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2401/00—Form of the coating product, e.g. solution, water dispersion, powders or the like
    • B05D2401/20—Aqueous dispersion or solution

Definitions

  • the following broad steps of the method thus achieved consist of direct coating by means of a direct coater 5, flame impinging by means of a first flame-impinging area 6, a :first smoothing unit 7, a second flame-impinging area 8 primarily for final removal of water from the coating material, a second smoothing unit 9 for flattening the coating over the singed wood filaments, a third flame-impinging area 10 to reduce the coating on the panel to a hot and highly moldable state, and a third smoothing unit 11 to finish the coating to a clean, smooth state and with good luster.
  • FIG. 1 is a diagrammatic view of the apparatus for carrying out the present process.
  • the direct coater 5 essentially comprises a preferably knurled doctor roll 15 in operative contact with a rubber applicator roll 16.
  • the valleys between the knurls deposit predetermined amounts of finishing material on the surface of the applicator roll, the latter, in turn, depositing said material on the upper face of the panel 17.
  • the panel is fed between the applicator roll 16 and a driven support roll to provide for the application of a unifom1- thickness of the coating over said panel surface.
  • Hydrosol system (10) Hydrosol system (a new class of aqueous copolymer dispersons; this group also provide reactive sites for cross linking when a thermoset or curable system is desired).
  • the common feature is the absence of non-aqueous solvents and the presence of water, it
  • nonusables are solvent-soluble acrylic copolymer water-thinnable vehicles, polyvinyl acetate maleate copolymers, and all other conventional solvent systems.
  • the first flame impingement area 6 preferably comprises a burner 19 which produces an open flame 20 that is directed toward the top surface of the panel 17.
  • the temperature of said flame should approximate 1400 F. to cause substantially instantaneous boiling off of most of the water from any of the above coating materials without causing bubbling, as the panel is moving, in the direction shown, at 300 to 500 fet per minute, approximately.
  • the viscosity of the coating material is, thereby, increased accordingly and halting, or at least slowing, the process of further penetration into the panel of residual water.
  • This flash effect of the burner takes place in a matter of two-tenths of a secondabout the time it takes for any point on the panel to move past the flame 20 at the above-indicated speed range.
  • the first smoothing unit 7 preferably comprises a polished steel smoothing roll 21 in contact with the coated side of the panel and between which and a support roll 22 the panel 17 moves. Said roll is heated in the approximate range of 550 to 600 F. It is desired that a difference of speed between the rolls 21 and 22 be maintained to keep the smoothing roll from becoming contaminated. To this end, the speed of the roll 21 is reduced relative to the support roll 22, and the latter roll is provided with a knurled or roughened surface. The resultant slippage between the roll 21 and the panel, as indicated, keeps the latter roll clean, i.e., clear of crusted coating material.
  • the second flame-impinging area 8 may be quite similar to the area 6, i.e., comprising a burner 19a producing an open flame 20a applied, as before, to the coated surface of the panel.
  • a burner 19a producing an open flame 20a applied, as before, to the coated surface of the panel.
  • Such water contained in the coating that has not been boiled off by the flame 19 will, ordi-. narily, be removed, without bubbling, from the coating by the flame 19a, leaving the surface of the coating somewhat roughened with the binder in the material in a raised condition as a result of the rapid evaporation of the water.
  • fine filaments have been observed flashing off from the coating.
  • the second smoothing unit 9 similar to the unit 7, comprises a smoothing roll 21a and a support roll 22a, the former being operated at the mentioned heat in the approximate range of 550 to 600 F with suflicient drag or acceleration, as before, on the smoothing roller 21a to keep coating material from adhering to it, but at an increased pressure setting between the rolls 21a and 22a. Since, in effect, the coating, during the second boil-off of Water, is in the raised-up condition above mentioned, the coating is flattened over the residual singed wood filaments and substantially totally covers the same. The result provides a smooth surface on the coating.
  • the third flame-impinging area comprises a burner 19b providing an open flame b, substantially similar to the previously described flame-impinging areas 6 and 8.
  • Said flame 20b at about 1400 F., is substantially as hot as theprevious flames, and will effect removal of any residual water that may have been trapped within the coating. Said flame causes release of said water by again roughening the coating, but to a lesser degree than before. Again, the moisture release is too rapid to cause bubbling. Also, additional wood filaments have been observed flashing off, the same being combined with small quantities of wood fibers caused by the breakdown of the cellulose structure of the panel due to the increased compression of the panel when moving between the rolls 21a and 22a. Activation of the natural resins may occur on the first coat on some substrates. This indicates excessive heat at this stage of the process, in which case the above-indicated heat for the flame 20b may be lowered to minimize this condition. In any case, the panel 17 leaves the area 10 with the coating thereon in a hot and highly moldable state as it reaches the third smoothing unit 11.
  • the latter unit comprises a smoothing roll 21b and a support roll 22b, the former, as before, being heated in the approximate range of 550 to 600 F.
  • Unit 11 is similar to unit 9, except that the pressure or nip is somewhat increased. The previously described drag to avoid contamination of the smoothing roll is provided in unit 11 also. This last step will leave the coating clean, smooth and with good luster.
  • thermosetting material instead of the three stages, as above, each comprising a flame and a smoothing function, that have been found satisfactory to seal thermoplastic coatings, two or more additional stages may be used, the latter stages for the purpose of providing time to effect the cure of the material.
  • additional flame-impinging and smoothing roll areas are shown in the drawing in broken lines.
  • thermoplastic coating At panel speed of 500 feet per minute, five stages may be required with a thermoplastic coating, and proportionally more stages for a thermosetting coating. Regardless of the number of stages used for particular coating materials, the flame and smoothing areas, in the aggregate, constitute a drying area.
  • the flame dryers impinge a flame of about 1400 F. directly to the surface of the panels.
  • the Water is removed so rapidly that the finish left tends to stand out rather than lie flat until the panel encounters the smoothing roll.
  • the first sealer or stain coat generally is used at about five to ten percent solids to expedite singeing of the minute filaments that are projecting from the board. As the finishing process progresses, however, the solids might increase to approximately fifty percent, depending on the nature of the board being finished and the depth of coating required.

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  • Application Of Or Painting With Fluid Materials (AREA)
US798387A 1969-02-11 1969-02-11 Panel-treating process Expired - Lifetime US3518105A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US79838769A 1969-02-11 1969-02-11

Publications (1)

Publication Number Publication Date
US3518105A true US3518105A (en) 1970-06-30

Family

ID=25173266

Family Applications (1)

Application Number Title Priority Date Filing Date
US798387A Expired - Lifetime US3518105A (en) 1969-02-11 1969-02-11 Panel-treating process

Country Status (3)

Country Link
US (1) US3518105A (de)
DE (1) DE2033432C3 (de)
GB (1) GB1266657A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997043485A1 (de) * 1996-05-09 1997-11-20 Ruehland Lothar Formteil bestehend aus strohfasern, papierfasern und einem bindemittel sowie verfahren zur herstellung eines derartigen formteils
WO1998036852A1 (en) * 1997-02-22 1998-08-27 The Aerogen Company Limited Curing of coatings

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3110607A (en) * 1961-03-13 1963-11-12 Clifford T Mcelroy Panel-treating process
US3219473A (en) * 1964-12-29 1965-11-23 Gen Plywood Corp Method of coating and smoothing wood surface

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3110607A (en) * 1961-03-13 1963-11-12 Clifford T Mcelroy Panel-treating process
US3219473A (en) * 1964-12-29 1965-11-23 Gen Plywood Corp Method of coating and smoothing wood surface

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997043485A1 (de) * 1996-05-09 1997-11-20 Ruehland Lothar Formteil bestehend aus strohfasern, papierfasern und einem bindemittel sowie verfahren zur herstellung eines derartigen formteils
WO1998036852A1 (en) * 1997-02-22 1998-08-27 The Aerogen Company Limited Curing of coatings

Also Published As

Publication number Publication date
DE2033432C3 (de) 1981-04-23
DE2033432A1 (de) 1972-01-20
GB1266657A (de) 1972-03-15
DE2033432B2 (de) 1980-08-21

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