IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0631403
(1984-07-16)
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발명자
/ 주소 |
- Kennon, James L.
- Sieminski, Richard
- Sharpless, John
- Scharf, Donald
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
66 인용 특허 :
3 |
초록
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A system for spray coating a substrate such as a plastic container with a gas barrier coating of a polymer dispersion. The system includes a spray coating booth or chamber including spray nozzles dispensing a spray of a coating material onto the surface of a series of containers continuously moving
A system for spray coating a substrate such as a plastic container with a gas barrier coating of a polymer dispersion. The system includes a spray coating booth or chamber including spray nozzles dispensing a spray of a coating material onto the surface of a series of containers continuously moving into and out of the coating chamber, an oven for drying the wet coating to remove the water from the coating to form a dried film on the container without distorting the container, and a conveyor for transferring the containers into the coating booth into proximity to the spray nozzles such that on actuation of the nozzles a stream of coating material coats the surface of the bottles with a wet coating layer and, thereafter, to the oven where the wet coating is dried. Means are provided for rotating the bottles during coating, during transport between the spray coating booth and the oven, and while in the oven. The coating booth includes a system for containing and removing both airborne and liquid overspray from the booth, and a dual delivery system for delivering the coating material to the spray nozzles and for reverse flushing the delivery system. The system operates to provide a continuously moving series of containers with a spray coating at production rates suitable for commercial applications.
대표청구항
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1. A system for spray coating a substrate with a liquid coating material containing particles of a film-forming material in a liquid vehicle, said system comprising, in combination, a coater including a coating chamber for receiving the substrate to be coated, spray nozzle means in said chamber
1. A system for spray coating a substrate with a liquid coating material containing particles of a film-forming material in a liquid vehicle, said system comprising, in combination, a coater including a coating chamber for receiving the substrate to be coated, spray nozzle means in said chamber for dispensing a spray of said liquid coating material onto said substrate, a chamber for heating said liquid coating material on said substrate to evaporate said liquid vehicle to form a substantially dry film of said material on said substrate, transport means for moving said substrate into said coating chamber, into proximity to said spray nozzle means for coating by said spray nozzle means, out of said coating chamber, and into said chamber for heating said liquid coating material on said substrate, and overspray control means for containing and conveying the airborne overspray from said coating chamber, said overspray control means comprising a particle collector for collecting the particles of film-forming material in said overspray, means for drawing the airborne overspray from said chamber and to said collector, and duct means connecting said particle collector to said coater for containing said overpray as it moves from said chamber to said collector, said particle collector being spaced from said coating chamber a sufficient distance such that said particles of film-forming material are substantially dried on reaching said collector. 2. The system of claim 1 further comprising means for rotating said substrate in said coating chamber and said heating chamber and during transport therebetween. 3. The system of claim 1 wherein said spray nozzle means comprises a hydraulic spray means. 4. The system of claim 1 wherein said coater is a vertical coater, said substrate entering and leaving said coating chamber through the top of the coater, and wherein said particle collector is located above the top of the coater, said duct means including a mask having inlet and outlet openings in the shape of the silhouette of the substrate being coated permitting the substrate to pass therethrough to enter and exit the top of said coating chamber, said means for drawing the airborne overspray from said chamber also drawing ambient air through said openings in said mask to cause drying of said overspray in said duct means between said coating chamber and said particle collector. 5. The system of claim 4 further comprising a mask over the top of the coating chamber having inlet and outlet openings in the shape of the silhouette of the substrate to be coater permitting its entrance to and exit from the coating chamber while limiting escape of the airborne overspray through the top of the coating chamber. 6. The system of claim 1 wherein said heating means comprises radiant heating means for drying the coating on said substrate to a substantially tack-free condition without distortion of said substrate. 7. The system of claim 1 further comprising valve and conduit means for conveying said liquid coating material to said spray nozzle means alternately through either of two available flow paths, said valve and conduit means including a reverse flow system permitting reverse flushing of one flow path while liquid coating material is conveyed to said spray nozzle means through the other flow path. 8. The system of claim 7 wherein said valve and conduit means includes a water supply line for forward flushing of said flow paths, said valve and conduit means being operative to forward flush said flow paths with water to a waste outlet line with only a minor portion of the water being vented through said spray nozzle means. 9. The system of claim 7 further comprising conduit means for conveying the liquid overspray from the bottom of said coater for recycling to said spray nozzle means. 10. A system for spray coating of containers with a liquid coating material comprising containing particles of a film-forming material in a liquid vehicle, said system comprising, in combination, an enclosed coater including a coating chamber for continuously receiving a series of containers to be coated, said containers moving vertically downward into said coating chamber to be coated and vertically upwardly out of the coating chamber after spray coating, spray nozzle means in a vertical wall of said chamber for dispensing a stream of said liquid coating material, means for locating said containers to be coated in proximity to said spray nozzle means such that on actuation of said spray nozzle means said stream of liquid coating material impacts on the surface of the containers to be coated, oven means spaced from said continuous coater for receiving said containers having the liquid coating material thereon, said oven means including heating means for heating the coating material on the substrate to remove said liquid vehicle to form a substantially tack-free film of said material on said substrate, conveyor means for continuously transporting said containers into said coater, into proximity to said spray nozzle means for impact spray coating of said containers, vertically upwardly out of said continuous coater, to said oven means, and into and out of said oven means, the length of travel of said coated containers through said oven means being such in relation to the speed of said conveyor means that said liquid coating on said containers is dried to a substantially tack-free condition without distortion of the containers, means for rotating said containers as they pass into proximity of said spray nozzle means, as they travel from said continuous coater to said oven means, and while in said oven means, overspray control means for containing and conveying the airborne overspray from said coating chamber, said overspray control means comprising a particle collector for collecting the particles of film-forming material in the airborne overspray, means for drawing the airborne overspray from said chamber to said collector and duct means connecting said particle collector to said coating chamber for containing said overspray as it moves from said chamber to said collector, said particle collector being mounted above the top of the coater, said duct means including a mask having inlet and outlet openings in the shape of the silhouette of the containers being coated permitting the containers to pass therethrough and into said duct means and then to enter and exit the top of the coating chamber, said means for drawing the airborne overspray from said chamber to said particle collector being operative to draw ambient air through said openings in said mask to cause drying of said overspray in said duct means between said coating chamber and said particle collector, said particle collector being removed from said coating chamber a sufficient distance such that said particles of film-forming material are substantially dry on reaching said collector, a second mask over the top of the coating chamber having inlet and outlet openings in the shape of the silhouette of the containers to be coated permitting their entrance to and exit from the coating chamber while limiting escape of the airborne overspray through the top of the chamber, and liquid spray material supply means comprising valves and conduits defining two alternate flow paths from a source of liquid coating material to said spray nozzle means, said valves and conduits being operative to alternate flow of liquid coating material through either flow path while permitting reverse flushing of the other flow path.
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