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WO1999011389A2 - Dispositif d'application pour liquides visqueux et procede correspondant - Google Patents

Dispositif d'application pour liquides visqueux et procede correspondant Download PDF

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Publication number
WO1999011389A2
WO1999011389A2 PCT/US1998/017055 US9817055W WO9911389A2 WO 1999011389 A2 WO1999011389 A2 WO 1999011389A2 US 9817055 W US9817055 W US 9817055W WO 9911389 A2 WO9911389 A2 WO 9911389A2
Authority
WO
WIPO (PCT)
Prior art keywords
spray
tip
handle
barrel
range
Prior art date
Application number
PCT/US1998/017055
Other languages
English (en)
Other versions
WO1999011389A3 (fr
Inventor
Jeffrey Charles Weber
Seshadri Ramachandran
Original Assignee
E.I. Du Pont De Nemours And Company
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
Priority claimed from US08/920,920 external-priority patent/US5976631A/en
Application filed by E.I. Du Pont De Nemours And Company filed Critical E.I. Du Pont De Nemours And Company
Priority to AU89113/98A priority Critical patent/AU737255B2/en
Priority to EP98940954A priority patent/EP1030739B1/fr
Priority to BR9814449-9A priority patent/BR9814449A/pt
Priority to DE69819195T priority patent/DE69819195T2/de
Priority to JP2000508479A priority patent/JP3613463B2/ja
Priority to CA002302464A priority patent/CA2302464C/fr
Publication of WO1999011389A2 publication Critical patent/WO1999011389A2/fr
Publication of WO1999011389A3 publication Critical patent/WO1999011389A3/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B9/00—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour
    • B05B9/007—At least a part of the apparatus, e.g. a container, being provided with means, e.g. wheels, for allowing its displacement relative to the ground
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/60—Arrangements for mounting, supporting or holding spraying apparatus
    • B05B15/65—Mounting arrangements for fluid connection of the spraying apparatus or its outlets to flow conduits
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B9/00—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour
    • B05B9/03—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material
    • B05B9/04—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump
    • B05B9/0403—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump with pumps for liquids or other fluent 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
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying

Definitions

  • the present invention relates to a method for the application of a viscous liquid, such as an adhesive or sealant, to floor and wall surfaces.
  • a viscous liquid such as an adhesive or sealant
  • FIG. 1 is a highly stylized diagrammatic illustration of the Roberts Monobond" Spray Adhesive System.
  • Such a system includes a high pressure pump P that pumps an adhesive V from a reservoir R, through a flexible hose F, and from a spray wand apparatus generally indicated by character W.
  • the adhesive is a solvent-based adhesive.
  • the pressure of the adhesive is controlled by a pump pressure governor diagrammatically indicated by the reference character G.
  • the spray wand includes a trigger handle H connected through an extension barrel B to a spray tip T.
  • a system such as that shown in Figure 1 is believed to have associated with it a number of disadvantages .
  • Adhesive applied by the known spray system has a tendency to splash, making precision lay-down difficult.
  • spray it is meant the undesired application of liquid to any nearby surface other than the intended surface, including adjacent wall or floor surfaces, clothing and feet of the operator, etc. Splashing is caused by the rebounding of larger sized droplets upon impact with the surface and is especially disadvantageous in regions of a floor close to a wall surface or adjacent to an existing carpeted area.
  • misting causes overspray which is a fringe- like deposition of liquid in a region immediately surrounding the area of desired application.
  • the inhalation of mist is harmful to an operator and requires the use of respirator equipment.
  • Misting often results in an adhesive coating on walls, furnishings and clothing, thus necessitating protective covers.
  • Solvent-based adhesive the most common adhesive used, emits volatile organic compounds. Thus, it is often necessary to vacate the area of the building during adhesive lay-down. Clean-up of solvent-based adhesive is also difficult, requiring the pumping of large volumes of solvent through the spray system in order to flush the adhesive from the equipment .
  • the known spray system is believed to have ergonomic problems as well.
  • the system is usually configured so that in order to effect perpendicular-to- the-floor spraying (to minimize splashing) the operator is required to flex the wrist of the arm holding the handle at an uncomfortable angle. Moreover, in order to bring the tip within a reasonably close distance from the surface the operator is required to stoop at the waist . These postures are ergonomically stressful to the operator.
  • the known system also has the disadvantage in use that it frequently results in spraying the tops of the feet of the operator.
  • the present invention is directed to a method while in another aspect to an apparatus, both for the spray application of a shear-thinning viscous liquid, such as a water-based adhesive or a sealant, to a surface.
  • a viscous liquid having a low shear rate viscosity in the range from about 0.1 Pascal . seconds to about ten (10) Pascal . seconds at a shear rate of ten (10) per second, a shear-thinning power law index in the range from about 0.2 to about 0.6, a high shear rate viscosity in the range from about 0.05 Pascal . seconds to about 0.5 Pascal .
  • the liquid is thereafter sprayed at a dynamic pressure in the range from about one hundred (100) pounds per square inch to about one thousand (1000) pounds per square inch, and, more preferably, in the range from about four hundred (400) pounds per square inch to about one thousand (1000) pounds per square inch, to cause the liquid to emanate as a spray through the tip of an applicator wand, whereby substantially no misting occurs upon emanation of the liquid from the tip.
  • the spray tip has a diameter in the range from about 0.025 inch to about 0.065 inch. As the operator walks across the floor surface a coating of liquid is applied thereto.
  • a spray applicator apparatus in accordance with the apparatus aspect of the present invention includes a handle, an elongated tubular barrel, an angled adapter, and a sharp-edged spray tip.
  • One of the barrel or the adjustable adapter is directly connected to the handle while the other of the barrel or the adjustable adapter is directly connected to the tip.
  • the handle, the barrel and the adapter are arranged such that when the handle is held by an operator in an ergonomic position the axis of the adhesive spray emanates from the tip at approximately ninety (90) degrees to the surface such that substantially no splash occurs upon contact of the liquid with the surface.
  • the apparatus further includes a pump for pressurizing the viscous liquid to the static and dynamic pressures noted.
  • Figure 1 is a highly stylized diagrammatic illustration of a spray apparatus of the prior art.
  • Figure 2 is a highly stylized diagrammatic illustration generally similar to Figure 1 showing a spray apparatus in accordance with the apparatus aspect of the present which is able to be used to practice the method aspect of the present invention.
  • FIG. 2 is a highly stylized diagrammatic illustration showing a spray system generally indicated by reference character 10 that includes an apparatus 18 in accordance with the apparatus aspect of the present invention that is useful for spray application of a viscous liquid to floor and wall surfaces in accordance with the method aspect of the present invention.
  • the system 10 includes a pump 12 the inlet end 121 of which is immersed into a liquid reservoir 14 containing a viscous liquid 15.
  • the pump 12 includes a selector valve 12V. Depending upon the setting of the selector valve 12V viscous liquid may be recirculated into the reservoir 14 through a bleed line 12B or output from the pump 12 through the pump outlet port 12P.
  • the outlet port 12P of the pump 12 is connected through a hose 16 to a spray apparatus, or wand, generally indicated by the reference character 18.
  • a pressure gauge 12G is incorporated in the line at the outlet port 12P to indicated the pressure at this point. The pressure gauge 12G helps set the static pressure precisely and thus control the spray misting aas well as the volume of liquid applied.
  • the spray wand 18 includes a trigger handle 20 that is connected through an elongated tubular barrel 22 and an angled adapter 24 to a spray tip 26.
  • the barrel 22 is shown as being directly connected to the handle 20 while the adapter 24 is connected to the tip 26. It should be understood, however, that this order of parts may be reversed such that the adapter 24 is connected to the handle 20 while the barrel 22 is connected to the tip 26. Either configuration is seen to provide the advantages listed herein.
  • the viscous liquid reservoir 14 is preferably implemented using the container in which the viscous liquid is typically sold.
  • the system 10 may be used with any viscous liquid 15 having a relatively high viscosity, the preferred use of the system 10 being the application of a high viscosity water-based sprayable adhesive or sealant to floor and wall surfaces in anticipation of installation of carpet.
  • high viscosity it is meant a liquid that has a low shear rate viscosity in the range from about 0.1 Pascal . seconds to about ten (10) Pascal . seconds at a shear rate of ten (10) per second, a shear- hinning power law index in the range from about 0.2 to about 0.6, and a high shear rate viscosity in the range from about 0.05 Pascal .
  • the power law index is the slope of shear stress versus shear rate in a log- log plot. That is, shear stress is proportional to (shear rate) raised to the power n, where n is the power law index.
  • a suitable adhesive is available from Advanced AirTech Adhesives Inc., Dalton, Georgia, as product AAT 677. It may be found to be convenient in practice to use the spray system 10 to apply a high viscosity sealant.
  • the tubular barrel 22 is between one and one-half (1.5) and four (4) feet in length, and more preferably, between two and one-half (2.5) and three and one-half (3.5) feet in length.
  • Suitable for use as the tubular barrel 22 is the three (3) foot extension manufactured by Graco Inc., Minneapolis, Minnesota, as part number 224-415.
  • the angled adapter 24 is preferably implemented using a forty-five (45) degree fixed angle adapter manufactured by Graco Inc. as part number 224-399.
  • the tip 26 may be implemented using any spray tip having an orifice size in the range from about 0.025 inch to about 0.065 inch. Suitable for use is the spray tip having a 0.035 orifice size known as "Reverse-A-Clean Tip" available from Graco Inc. as part number 221-635.
  • the tip 26 is implemented using a sharp-edged spray tip.
  • sharp-edged tip it is meant a tip of the kind that permits control of the lay-down location of the liquid adhesive or sealant so that a coating having a sharp, well-defined edge at the applied coating boundary is defined.
  • Suitable sharp- edged spray tips are available from Graco Inc. as part numbers LLT327, LLT625, LLT355.
  • the pump 12 is conveniently mounted on a wheeled carrier 28.
  • the pump 12 is used to pressurize the high viscosity (as defined above) liquid 15 to a predetermined static pressure in the range from about five hundred (500) pounds per square inch to about fourteen hundred (1400) pounds per square inch, and, more preferably, in the range from about eight hundred (800) pounds per square inch to about fourteen hundred (1400) pounds per square inch and to a predetermined dynamic pressure dynamic pressure in the range from about one hundred (100) pounds per square inch to about one thousand (1000) pounds per square inch, and, more preferably, in the range from about four hundred (400) pounds per square inch to about one thousand (1000) pounds per square inch.
  • a predetermined static pressure in the range from about five hundred (500) pounds per square inch to about fourteen hundred (1400) pounds per square inch, and, more preferably, in the range from about eight hundred (800) pounds per square inch to about fourteen hundred (1400) pounds per square inch and to a predetermined dynamic pressure dynamic pressure in the range from about one hundred
  • a pump suitable for use within the system 10 must be capable of maintaining substantially constant liquid pressure throughout the entire dynamic pressure range. For better uniformity of coating the higher pressure values in the defined ranges (consistent with the minimization of misting) should be used.
  • Suitable for use as the pump 12 having a such control is the pump manufactured by Graco Inc. and sold as model "Ultra-Plus 600", part number 231-358. This pump model includes a one-quarter (0.25) inch hose (Graco Inc. part number 223-541) and a handle useful as the handle 20. A 3/16-th inch by three foot whip hose is attached between the hose and the handle to provide flexibility.
  • the common problem of misting of liquid as it emanates from the spray tip 26 is substantially eliminated by the use of high viscosity liquids pressurized to a static pressure and a dynamic pressure in the ranges described above. Further, the use of the sharp-edged spray tip in the particular embodiment of the apparatus of the invention permits an even coating of viscous liquid with crisp edges to be achieved.
  • the spray gun handle 20, the tubular barrel 22 and the adapter 24 are arranged with respect to each other such that when the handle 20 of the wand 18 is comfortably held by an operator who is standing in a substantially upright position the axis A of the liquid spray L emanates from the tip 26 at approximately ninety (90) degrees to the floor surface. If spraying is attempted with the spray axis A at other than approximately ninety (90) degrees to the surface, splashing may result .
  • the handle 20, the barrel 22, the angled adapter 24 are sized to define an ergonomic spray wand 18 whereby the spray tip 26 may be positioned by the operator within a predetermined optimum distance from the surface F without the need for stooping as is typically necessary in prior spray systems.
  • the tip 26 is preferably within a predetermined distance D from the floor surface.
  • the distance D is within two (2) feet, and more preferably, about one (1) foot from the floor surface.
  • the method of use of the system of the present invention in applying viscous liquid 15 to a floor surface in anticipation of installation of carpet may be understood from the following discussion.
  • the reservoir 14 of high viscosity liquid (as defined above) is placed in the carrier 28 so that it may be conveniently maintained within a close proximity (within the hose length) of the area being coated.
  • the selector valve 12V With the selector valve 12V in the active position the pump pressure is adjusted from its lowest pressure setting to a desired static pressure lying within the predetermined static pressure range. Since the trigger on the handle is not yet asserted, no liquid flow occurs. Hence, the pressure value indicated on the gauge 12G is the static pressure reading.
  • the trigger of the handle 20 is asserted and viscous liquid a dynamic pressure lying within the predetermined dynamic pressure range is pumped by the pump 12, through the hose 16, to the wand 18.
  • the liquid emanates as a spray through the tip 26 of the wand 18.
  • the actual pressure values for the static and dynamic pressures are determined empirically, with the pressure set sufficiently high so that the flow of the liquid is steady, while at the same time low enough so that substantially no misting (and thus, no overspray) occurs.
  • the operator applies the liquid 15 to the floor surface while holding the spray gun handle 20 in an ergonomic position.
  • An ergonomic position may be defined as one in which the physical stresses and fatigue on the operator are minimized, and the operator may work comfortably for a relatively long period of time. For instance, the operator's wrist should be held relatively straight while holding the spray gun handle 20, while the shoulders are relaxed and the elbow is kept in a natural position. The operator should be standing upright so as to minimize any stress to the lower back.
  • the tip 26 lies within two (2) feet, and more preferably, about one (1) foot, of the floor surface, and the axis A of the viscous liquid spray emanating from the spray tip 26 is approximately ninety (90) degrees to the floor surface, so that substantially no splashing occurs.
  • the liquid coating is applied in a substantially rectangular pattern S to the area to be coated.
  • the dimensions of the pattern S are dependent upon the distance D and the spray tip used.
  • the posture of the operator, and the orientation of the wand 18 is adjusted appropriately if it is desired to apply a coating to the portion of the wall surface adjacent to the floor.
  • the crisp edges of the liquid as applied by using the system of the present invention reduce the amount of overlap required between successive passes of liquid with the spray tip 26.
  • the even application of the liquid provided by the use of the invention reduces the need for manual fill-in of unsprayed areas.
  • water-based adhesives as the viscous liquid avoids the problems associated with solvent-based systems, such as volatile organic compounds, are eliminated.
  • practicing the method of the present invention reduces misting and overspray, and thus avoids coating adhesive on walls, furnishing and clothing.
  • water-based adhesives allow much easier clean-up of spray equipment following use.
  • solvent -based systems expensive and hazardous solvents must be pumped through the equipment to remove the adhesive after use.
  • the equipment is cleaned by flushing water through the system after use to eliminate residual viscous liquid. This may be followed by flushing with mineral thinner which may prevent rusting of pump and spray system components .
  • the method aspect of the present invention may be implemented using any spray apparatus, including a spray apparatus configured as described in the prior art .

Landscapes

  • Application Of Or Painting With Fluid Materials (AREA)
  • Nozzles (AREA)
  • Coating Apparatus (AREA)
  • Paints Or Removers (AREA)

Abstract

Ce dispositif permettant d'appliquer sur une surface un liquide visqueux est constitué d'une lance pourvue d'une poignée, d'un tube allongé, d'un adaptateur formant un angle et d'une tête de pulvérisation à bord vif, le tube ou l'adaptateur étant directement raccordé à la poignée et celui des deux qui n'est pas raccordé à la poignée étant raccordé à la tête de pulvérisation. La poignée, le tube et l'adaptateur sont conçus de manière que, lorsqu'un opérateur tient en main la poignée dans une position ergonomique, l'axe de la pulvérisation d'adhésif sorte de la tête à quatre-vingt-dix degrés (90) environ par rapport à la surface. La longueur du tube allongé est comprise entre environ un pied et demi (1,5) et quatre (4) pieds.
PCT/US1998/017055 1997-08-29 1998-08-18 Dispositif d'application pour liquides visqueux et procede correspondant WO1999011389A2 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
AU89113/98A AU737255B2 (en) 1997-08-29 1998-08-18 Viscous liquid applicator method and apparatus
EP98940954A EP1030739B1 (fr) 1997-08-29 1998-08-18 Dispositif d'application pour liquides visqueux et procede correspondant
BR9814449-9A BR9814449A (pt) 1997-08-29 1998-08-18 Método para aplicar um lìquido viscoso amolecido no cisalhamento a uma superfìcie, aparelho de aplicação por pulverização para aplicar um lìquido viscoso amolecido no cisalhamento a uma superfìcie e sistema de aplicação por pulverização
DE69819195T DE69819195T2 (de) 1997-08-29 1998-08-18 Auftragsgerät- und methode für viskose- flüssigkeit
JP2000508479A JP3613463B2 (ja) 1997-08-29 1998-08-18 粘性流体の塗布方法
CA002302464A CA2302464C (fr) 1997-08-29 1998-08-18 Dispositif d'application pour liquides visqueux et procede correspondant

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US92471797A 1997-08-29 1997-08-29
US08/924,717 1997-08-29
US08/920,920 1997-08-29
US08/920,920 US5976631A (en) 1997-08-29 1997-08-29 Viscous liquid applicator method

Publications (2)

Publication Number Publication Date
WO1999011389A2 true WO1999011389A2 (fr) 1999-03-11
WO1999011389A3 WO1999011389A3 (fr) 2002-10-03

Family

ID=27129809

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1998/017055 WO1999011389A2 (fr) 1997-08-29 1998-08-18 Dispositif d'application pour liquides visqueux et procede correspondant

Country Status (8)

Country Link
EP (1) EP1030739B1 (fr)
JP (1) JP3613463B2 (fr)
AR (1) AR013456A1 (fr)
AU (1) AU737255B2 (fr)
BR (1) BR9814449A (fr)
CA (1) CA2302464C (fr)
DE (1) DE69819195T2 (fr)
WO (1) WO1999011389A2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6058574B2 (ja) * 2013-11-22 2017-01-11 能美防災株式会社 遮光剤、太陽光パネル表面の遮光装置、および太陽光パネル表面の遮光方法
JP7483260B2 (ja) * 2020-09-07 2024-05-15 日本ペイントホールディングス株式会社 液膜吐出塗装用、液柱吐出塗装用または液滴吐出塗装用の塗料組成物

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4323196A (en) * 1980-02-22 1982-04-06 Logue Gerald W Paint spraying apparatus
US5366309A (en) * 1993-07-08 1994-11-22 Springall Ernest G L Apparatus for applying adhesive

Also Published As

Publication number Publication date
DE69819195T2 (de) 2004-06-09
DE69819195D1 (de) 2003-11-27
AR013456A1 (es) 2000-12-27
AU737255B2 (en) 2001-08-16
BR9814449A (pt) 2001-10-23
EP1030739B1 (fr) 2003-10-22
JP2003513769A (ja) 2003-04-15
CA2302464C (fr) 2003-05-27
JP3613463B2 (ja) 2005-01-26
AU8911398A (en) 1999-03-22
WO1999011389A3 (fr) 2002-10-03
CA2302464A1 (fr) 1999-03-11
EP1030739A1 (fr) 2000-08-30

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