EP0879648A2 - Verfahren und Vorrichtung zum Aufbringen von zusammengesetzten Beschichtungen - Google Patents

Verfahren und Vorrichtung zum Aufbringen von zusammengesetzten Beschichtungen Download PDF

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Publication number
EP0879648A2
EP0879648A2 EP98304017A EP98304017A EP0879648A2 EP 0879648 A2 EP0879648 A2 EP 0879648A2 EP 98304017 A EP98304017 A EP 98304017A EP 98304017 A EP98304017 A EP 98304017A EP 0879648 A2 EP0879648 A2 EP 0879648A2
Authority
EP
European Patent Office
Prior art keywords
particles
substrate
hopper
predetermined path
liquid binder
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Withdrawn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
EP98304017A
Other languages
English (en)
French (fr)
Other versions
EP0879648A3 (de
Inventor
Jack G. Scarpa
Terry L. Hall
Kyle R. Hamlin
Steven A. Cosby
Tony W. Howard
Fletcher J. Burgess
John D. Marlin, Iv
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.)
USBI Co
Original Assignee
USBI Co
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 USBI Co filed Critical USBI Co
Publication of EP0879648A2 publication Critical patent/EP0879648A2/de
Publication of EP0879648A3 publication Critical patent/EP0879648A3/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
    • B05B7/1404—Arrangements for supplying particulate material
    • B05B7/1431—Arrangements for supplying particulate material comprising means for supplying an additional liquid
    • 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
    • B05D1/34—Applying different liquids or other fluent materials simultaneously
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/12—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for distributing granular or liquid materials
    • E01C19/21—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for distributing granular or liquid materials for simultaneously but separately applying liquid material and granular or pulverulent material, e.g. bitumen and grit, with or without spreading ; for filling grooves and gritting the filling

Definitions

  • the present invention relates to a method and system for coating a substrate, and specifically relates to a method and system for coating a substrate with an aggregate material.
  • Coating a substrate such as concrete with abrasive anti-skid coatings or decorative coatings typically requires mixing a liquid binder material with an aggregate such as sand or ground quartz and then painting or spraying the mixture onto the concrete. If only a portion of the substrate requires coating, accuracy and control requirements typically dictate whether the mixture is applied by spraying or by painting with some sort of brush. Spray coating processes, however, are limited due to the low sprayability of the liquid binder materials which are typically highly viscous, the limit in attainable coating thickness, and the high amount of waste material generated.
  • liquid binder materials that are utilized in applying anti-skid coatings or decorative coatings (such as the reflective stripes used for lane markings on roadways) have viscosities at ambient temperature which preclude the use of conventional spray applicators.
  • the liquid binder material is often mixed with a solvent.
  • solvents are often environmentally hazardous, and therefore waste material from the spray coating process must be disposed of as hazardous waste.
  • the conventional spray coating processes comprise combining a liquid binder material (which may include a curing agent), solvents, and aggregate in a vat to form a mixture. This mixture is then pumped from the vat through conduits to a nozzle where it is atomized and sprayed onto the substrate. Once the mixture has been applied to the substrate, the solvent is removed therefrom by evaporation of volatile gas or by applying heat to the mixture to speed evaporation of the solvent.
  • Another object of the present invention is to combine the aggregate particles with a liquid binder material external of the spray nozzles.
  • a system for applying an aggregate coating to a substrate including an apparatus comprising a first hopper for supplying aggregate particles, the hopper being arranged in spaced relation to and above the substrate, first release means for releasing the particles from said first hopper along a first predetermined path that intersects the substrate at a first location, spray means for spraying a liquid binder material along a plurality of paths, including a second predetermined path and a third predetermined path, wherein the second predetermined path intersects the first predetermined path above the substrate, and the third predetermined path intersects the substrate at a second location in spaced relation to the first location, and supply means for supplying the liquid binder material to the spray means; and means for moving the apparatus in a first direction relative to the substrate.
  • a method for applying an aggregate coating to a substrate comprising positioning a particle supply above a portion of said substrate, the supply containing a plurality of particles, releasing the particles from the aggregate supply at a predetermined rate, allowing said particles to free-fall towards said substrate, coating said particles with a liquid binder material as the particles free-fall towards the substrate, thereby producing coated particles, coating a portion of the substrate with the liquid binder material, thereby producing a coated portion, and impacting said coated particles onto the portion of substrate.
  • the present invention is directed toward improving spray coating processes for applying anti-skid or decorative coatings to substrates such as concrete by decreasing hazardous waste and system problems such as clogging and wear.
  • the applicator 10 is preferably mounted on a vehicle 12, such as a truck, to provide a means for moving the applicator in a first direction relative to the substrate.
  • a vehicle 12 such as a truck
  • liquid binder material means an adhesive material such as epoxy, polyurethane, or another polymer.
  • the applicator 10 has a supply means that includes at least one (and for binders which must be mixed with a curing agent, at least two) liquid binder storage containers 14,16, a motionless mixer/pump 18 that mixes both liquid binder material constituents (if a two part binder liquid binder is used), a first conduit 20 that extends from the containers 14,16, to the mixer/pump 18, and a second conduit 22 that extends from the mixer/pump 18 to one or more spray nozzles.
  • the storage containers 14, 16 are heated and pressurized to reduce the viscosity of the liquid binder constituents without the use of solvents.
  • the preferred embodiment further includes an air compressor 24 which may be integral with a generator, or may be driven by some other power source on the truck. The purpose of the air compressor is described in greater detail below.
  • the applicator 10 includes at least one, and preferably two hoppers 26,28 for supplying aggregate particles 30 to the liquid binder material 32.
  • Each hopper 26, 28 is located in spaced relation to, and above, the concrete travelling surface 34.
  • Integral with each hopper 26, 28 is a release mechanism 36 for releasing the particles from the hopper 28 associated therewith.
  • the release mechanism 36 for each hopper 26,28 includes a slot 38 in the hopper 26,28 for releasing the particles from that hopper 26,28, and a motorized rotary agitator 40 located in the slot for controlling the rate at which the particles are released from that hopper 26,28 through the slot 38.
  • One or more spray nozzles 42 are located on the truck adjacent the release slots.
  • the nozzles 42 are preferably fan spray nozzles of the type which produce a fan 44 of atomized liquid binder material 32 for broad coverage area.
  • each nozzle is preferably air-assisted. As such, pressurized air from the air compressor 24 is introduced around each nozzle 42 and aimed in the same direction as the liquid binder material 32 exiting that nozzle 42. This additional air assists in carrying the atomized droplets along the desired paths.
  • fan spray nozzles 42 may be manifolded to form a primary bank of nozzles which have spray fans 44 that overlap so as to insure complete coverage of the aggregate particles 30 released from the hoppers 26,28.
  • aggregate particles 30 are released from the first hopper 26 along a first predetermined path 46 that intersects the concrete 34 at a first location 48.
  • Each spray nozzle 42 because of its fan spray characteristics, sprays liquid binder material along a plurality of paths, and more specifically each nozzle in the primary bank 54 simultaneously sprays atomized liquid binder material along a second predetermined path 50 and a third predetermined path 52.
  • the second predetermined path 50 intersects the first predetermined path 46 above the concrete 34 , and therefore atomized droplets of liquid binder material sprayed along this path 50 substantially coat the aggregate particles as they free-fall from the first hopper 26.
  • Atomized droplets of liquid binder material sprayed along the third predetermined path 52 intersect the concrete 34 at a second location 56 in spaced relation to the first location 48, which, due to the movement of the applicator 10 in the first direction 58 relative to the concrete 34, primes a selected portion of the concrete 34 with liquid binder material immediately prior to the substantially coated aggregate particles impacting thereon.
  • a secondary bank 60 of spray nozzles is positioned adjacent to the first path 46 opposite the first bank 54.
  • the nozzles of the secondary bank 60 are of the same type as the nozzles of the first bank 54, except that each spray nozzle in the secondary bank 60 simultaneously sprays atomized liquid binder material along a fourth predetermined path 62 and a fifth predetermined path 64.
  • the fourth predetermined path 62 intersects the first predetermined path 46 above the concrete 34, and since the secondary bank of nozzles 60 opposes the primary bank, atomized droplets of liquid binder material sprayed from the second bank 60 along the fourth path 62 coats one side of each particle as it free-falls, thereby coating the portion of each particle which is shielded from the spray of the first bank by the particle itself.
  • the fifth predetermined path 64 intersects the substrate at a third location 66 in spaced relation to the first location 48, and the first location 48 is between the second 56 and third 66 locations.
  • Atomized droplets of liquid binder material sprayed along the fifth predetermined path 64 intersect the concrete 34 at the third location 66, which, due to the movement of the applicator 10 in the first direction 58 relative to the concrete 34, lays down a top-coat 68 of liquid binder material over the aggregate particles 30 on the selected portion of the concrete 34.
  • the first embodiment of the applicator 10 of the present invention includes a second hopper 28 and a deflector plate 70 for deflecting particles released from the second hopper 70 into the first predetermined path 46 is located immediately below the first 26 and second 28 hoppers. If an aggregate coating is desired which includes a mixture of very fine particles of one type of material and coarser particles of another type of material, storing the fine and coarse particles in the same hopper would likely result in the fine particles settling to the bottom thereof. Accordingly, the concentration of fine particles in the aggregate released from the hopper would initially be relatively high, and decrease as the hopper was emptied during the coating process.
  • This problem is avoided by storing the two aggregate particle types in separate hoppers, 26,28 and using the deflector plate 70 to direct the particles released from the second hopper 28 into the path 46 of the particles released from the first hopper 26.
  • the desired concentration of fine particles can be maintained throughout the coating process until one of the hoppers becomes empty. Additional hoppers and release mechanisms may be added as needed to accommodate mixing of aggregate coatings having three or more different materials of varied particle size.
  • the agitators tend to release the particles in pulses or "waves"
  • the agitators can be mechanically or electrically controlled to insure that when the waves of particles released from the second hopper 28 intersect the first predetermined path 46, the waves of particles released from the second hopper 28 are out of phase with the waves of particles released from the first hopper 26.
  • a second embodiment of the applicator 10 of the present invention is shown in Figure 4.
  • the second embodiment is the same as the first embodiment, except that the second embodiment does not include a deflector plate 70, and the second bank 60 of nozzles in the second embodiment does not oppose the first bank 54 of nozzles. Absent the deflector plate 70, aggregate particles are released from the second hopper and free-fall along a sixth predetermined path 72 that terminates at a fourth location 74.
  • Each spray nozzle in the secondary bank 60 of the second embodiment simultaneously sprays atomized liquid binder material along a fourth predetermined path 76 and a fifth predetermined path 78, as in the first embodiment.
  • the fourth predetermined path 76 intersects the sixth predetermined path 72 above the concrete 34, and therefore atomized droplets of liquid binder material sprayed along this path 76 substantially coat the aggregate particles as they free-fall from the release mechanism of the second hopper 28.
  • Atomized droplets of liquid binder material sprayed along the fifth predetermined path 78 intersect the concrete 34 at a fifth location 80 in spaced relation to the fourth location 74 and between the first 48 and fourth 74 locations.
  • liquid binder material sprayed along the fifth predetermined path 78 primes the aggregate particles from the first hopper 26, which have already been coated onto the selected portion of the concrete 34, with liquid binder material, immediately prior to subsequent coating of the selected portion with aggregate particles released from the second hopper 28. Since the second bank 60 of nozzles in the second embodiment is not positioned so as to produce a top-coat on the aggregate particles released from the second hopper 28, the second embodiment leaves an aggregate top surface 82 which is partially uncoated. This partially uncoated top surface 82 is used to provide a higher coefficient of friction for anti-skid coatings, or a higher reflectivity for decorative coatings.
  • the applicator of the present invention separately feeds the mixed liquid binder material and granular aggregate fillers (sand, filler etc.) into a convergent area and subsequently dynamically combines them external to the spray nozzles in a cross convergence.
  • slot sizes and agitation can be varied for different materials or different selected areas of concrete.
  • the present invention represents an improvement over prior art spray coating techniques since it improves sprayability, reduces excess material, and improves flowability by reducing the viscosity of the liquid binder material without the production of hazardous waste, minimizes clogging and eliminates the wear that a nozzle typically experiences as a result of spraying an abrasive material such as aggregate therethrough.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Nozzles (AREA)
EP98304017A 1997-05-20 1998-05-20 Verfahren und Vorrichtung zum Aufbringen von zusammengesetzten Beschichtungen Withdrawn EP0879648A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US85923897A 1997-05-20 1997-05-20
US859238 1997-05-20

Publications (2)

Publication Number Publication Date
EP0879648A2 true EP0879648A2 (de) 1998-11-25
EP0879648A3 EP0879648A3 (de) 1999-04-14

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP98304017A Withdrawn EP0879648A3 (de) 1997-05-20 1998-05-20 Verfahren und Vorrichtung zum Aufbringen von zusammengesetzten Beschichtungen

Country Status (2)

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EP (1) EP0879648A3 (de)
CA (1) CA2237865A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2800757A1 (fr) * 1999-11-09 2001-05-11 Cmtp Sarl Ensemble gravillonneur et repandeur de liant a rampe de diffuseurs de liant pour la preimpregnation de gravillons
WO2009051685A2 (en) * 2007-10-15 2009-04-23 Semmaterials, L.P. Seal coat process utilizing multiple applications of asphalt binder & aggregate

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE604814C (de) * 1932-01-25 1934-10-29 Alphonse Joseph Schars Fahrbare Vorrichtung zum Mischen und Auftragen von Gesteinsstoffen und einem bituminoesen Bindemittel fuer den Strassenbau
FR2626593A1 (fr) * 1988-01-29 1989-08-04 Screg Routes & Travaux Procede et dispositif pour la realisation d'un revetement de route
FR2626907A1 (fr) * 1988-02-09 1989-08-11 Secmair Sa Vehicule routier pour l'epandage simultane de liant et de gravillons sur une chaussee

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE604814C (de) * 1932-01-25 1934-10-29 Alphonse Joseph Schars Fahrbare Vorrichtung zum Mischen und Auftragen von Gesteinsstoffen und einem bituminoesen Bindemittel fuer den Strassenbau
FR2626593A1 (fr) * 1988-01-29 1989-08-04 Screg Routes & Travaux Procede et dispositif pour la realisation d'un revetement de route
FR2626907A1 (fr) * 1988-02-09 1989-08-11 Secmair Sa Vehicule routier pour l'epandage simultane de liant et de gravillons sur une chaussee

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2800757A1 (fr) * 1999-11-09 2001-05-11 Cmtp Sarl Ensemble gravillonneur et repandeur de liant a rampe de diffuseurs de liant pour la preimpregnation de gravillons
WO2009051685A2 (en) * 2007-10-15 2009-04-23 Semmaterials, L.P. Seal coat process utilizing multiple applications of asphalt binder & aggregate
WO2009051685A3 (en) * 2007-10-15 2009-07-02 Semmaterials Lp Seal coat process utilizing multiple applications of asphalt binder & aggregate
US7798744B2 (en) 2007-10-15 2010-09-21 Road Science, L.L.C. Seal coat process utilizing multiple applications of asphalt binder and aggregate

Also Published As

Publication number Publication date
EP0879648A3 (de) 1999-04-14
CA2237865A1 (en) 1998-11-20

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