IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0153265
(2005-06-15)
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등록번호 |
US-7717059
(2010-06-10)
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발명자
/ 주소 |
- Wanthal, Paul David
- Muvundamina, Mutombo J.
- Haruch, James
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출원인 / 주소 |
- Spraying Systems Co.
- H.B. Fuller Company
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대리인 / 주소 |
Leydig, Voit & Mayer, Ltd.
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인용정보 |
피인용 횟수 :
10 인용 특허 :
6 |
초록
▼
A liquid adhesive dispensing system operable for more uniformly applying liquid adhesive foam onto moving substrates, notwithstanding changes in line speed, adhesive liquid flow rates, or foaming/atomizing air pressures. The illustrated liquid adhesive system includes a header having a plurality of
A liquid adhesive dispensing system operable for more uniformly applying liquid adhesive foam onto moving substrates, notwithstanding changes in line speed, adhesive liquid flow rates, or foaming/atomizing air pressures. The illustrated liquid adhesive system includes a header having a plurality of air atomizing spray guns; the spray guns each having a respective variable speed positive displacement pump for directing a metered quantity of liquid adhesive from a liquid adhesive supply to the respective spray gun; and a control for controlling the operating speed of the positive displacement pumps in relation to the speed of the moving substrate and the foaming/atomizing air pressure to the spray guns in relation to the operating speed of the positive displacement pumps. The control further is operable for monitoring pressures across the positive displacement pumps for insuring the accurate direction of metered quantities of liquid to the spray guns. The spray guns are adapted for enhanced liquid adhesive foaming and atomization, and the header is convertible into a closed housing structure effective for containing cleaning and purge liquids during an automatically operable cleaning cycle of operation.
대표청구항
▼
What is claimed is: 1. A liquid adhesive dispensing system for dispensing liquid adhesive onto a moving substrate comprising a header having at least one spray gun, a liquid adhesive supply, a pressurized air supply, said spray gun having a liquid inlet coupled to said liquid adhesive supply for re
What is claimed is: 1. A liquid adhesive dispensing system for dispensing liquid adhesive onto a moving substrate comprising a header having at least one spray gun, a liquid adhesive supply, a pressurized air supply, said spray gun having a liquid inlet coupled to said liquid adhesive supply for receiving liquid adhesive from said liquid adhesive supply and a spray nozzle for dispensing liquid adhesive from said spray gun onto the moving substrate, said spray gun having an foaming/atomizing air inlet coupled to said pressurized air supply for receiving pressurized air and directing pressurized air to said nozzle, a selectively operable variable speed positive displacement pump coupled between said liquid adhesive supply and said spray gun for directing a metered quantity of liquid adhesive to said spray gun proportional to the rate of movement of the substrate, and said nozzle having a body formed with a liquid adhesive flow passage communicating with said liquid adhesive inlet, said nozzle having a nose portion extending from a downstream end of said nozzle body which defines a liquid adhesive discharge orifice, an air cap mounted in surrounding relation to said nozzle and having a central discharge orifice coaxially aligned with said nozzle nose portion and at least partially surrounding to said nozzle nose portion for defining a foaming/atomizing air passageway communicating with said pressurized air supply for directing pressurized air in surrounding relation to liquid adhesive discharging from said nose portion discharge orifice for atomizing the liquid adhesive into a foam of fine bubbles for dispensing into said moving substrate. 2. The liquid dispensing system of claim 1 including a sensor for sensing the rate of movement of said substrate, and a control operable for controlling the operating speed of said positive displacement pump in relation to the sensed rate of movement of said substrate. 3. The liquid dispensing system of claim 2 in which said header includes a plurality of said spray guns, said spray guns each having a liquid supply line with a respective positive displacement pump for directing a metered quantity of liquid adhesive to the respective spray gun proportional to the rate of substrate movement. 4. The liquid dispensing system of claim 2 in which said pressurized air supply to said foaming/atomizing air inlet of said spray gun includes a pressure regulator operable from said control for causing a predetermined pressurized air flow to be directed to the spray gun. 5. The liquid dispensing system of claim 4 in which said control is operable for controlling the pressure of air supplied to said spray gun in relation to the operating speed of said positive displacement pump. 6. The liquid adhesive dispensing system of claim 1 in which said positive displacement pump has a liquid supply line coupled to said liquid adhesive supply and an outlet line coupled to said spray gun, a first sensor for sensing the liquid pressure in said outlet line, a second sensor for sensing the liquid pressure in said inlet line, and a control operable in response to said sensors sensing a differential in the liquid pressure in said inlet and outlet lines for adjusting the pressure of liquid adhesive supplied to said inlet line for equalizing the liquid pressures in said inlet and outlet lines. 7. The liquid dispensing system of claim 6 including a selectively operable pressure regulator for adjustably establishing the pressure of said liquid adhesive supply, and said control being operable in response to said first and second sensors sensing a pressure differential in said inlet and outlet lines for adjusting said pressure regulator and the pressure of said liquid supply for equalizing the liquid pressures in said inlet and outlet lines. 8. The liquid dispensing system of claim 6 in which said liquid supply includes a pressure vessel containing a quantity of liquid adhesive, a selectively operable pressure regulator for controlling the pressure of said pressure vessel, and said control being operable in response to said first and second sensors sensing a pressure differential in said inlet and outlet lines for operating said pressure vessel regulator to adjust the pressure of said pressure vessel. 9. The liquid adhesive dispensing system of claim 1 in which said positive displacement pump is a gear pump having a liquid inlet and a liquid outlet, and said gear pump having a pair of intermeshing rotatable gears operable for directing a predetermined quantity of liquid through the pump during each revolution of said gears. 10. The liquid adhesive dispensing system of claim 1 in which said nose portion is disposed in recessed relation to a downstream end of said air cap discharge orifice for defining a mixing chamber within said air cap. 11. The liquid adhesive system of claim 10 in which said nozzle nose portion and said air cap discharge orifice have sharp annular corners which define a passageway for communicating foaming/atomizing air to said mixing chamber. 12. The liquid adhesive dispensing system of claim 11 in which said cover is pivotably movable between said open and closed positions. 13. The liquid adhesive dispensing system of claim 12 in which said housing includes a lower open top compartment and said cover is pivotable relative to said lower compartment between open and closed positions, said cover and lower compartment each having a double walled construction, and said cover being movable to said closed position with the walls of said compartment and cover being in interengaging relation to prevent the escape of cleaning and purge water from the housing without a separate sealing member. 14. The liquid dispensing system of claim 13 in which said pressurized air supply to said spray gun includes a pressure regulator operable from said control for causing a predetermined pressurized air flow to be directed to each of said spray guns. 15. The liquid adhesive dispensing system of claim 13 in which each said positive displacement pump is a gear pump having a liquid inlet and a liquid outlet, and each said gear pump having a pair of intermeshing rotatable gears operable for directing a predetermined quantity of liquid through the pump during each revolution of said gears. 16. The liquid adhesive dispensing system of claim 13 in which pressurized air is directed to said foaming/atomizing air inlets of said spray guns from a common manifold line, and said control includes a pressure regulator in said manifold line for controlling the pressure of the foaming/atomizing air. 17. The liquid dispensing system of claim 12 in which said header includes a plurality of said spray guns, spray guns each having a liquid supply line with a respective positive displacement pump for directing a metered quantity of liquid adhesive to the respective spray gun. 18. The liquid adhesive dispensing system of claim 1 including a water supply selectively connectable to said spray gun for directing a purge water through said spray gun for cleaning internal passages of said spray gun during a cleaning cycle, and said header including a housing for collecting purge water directed through said spray gun. 19. The liquid adhesive dispensing system of claim 18 in which said housing includes a selectively closable cover, and said cover carrying at least one water spray nozzle connectable to said water supply for directing water onto and cleaning exterior surfaces of said spray gun. 20. The liquid adhesive dispensing system of claim 19 in which said cover is selectively movable between an open position which permits direction of liquid adhesive from said spray gun onto the moving substrate and a closed position in which said cover closes the housing and orients the water spray nozzle in a direction toward the spray gun. 21. The liquid adhesive dispensing system of claim 20 in which said housing has a drain for draining purge and cleaning water from said housing. 22. The liquid dispensing system of claim 1 in which said liquid adhesive supply is a supply of a water based liquid adhesive. 23. The liquid dispensing system of claim 1 including a control for controlling the operating speed of said positive displacement pump, a liquid flow meter for measuring the liquid flow rate to said pump from said liquid supply, said control being operable for comparing the measured liquid flow rate with a theoretical flow rate and adjusting the speed of said positive displacement pump to compensate for differences between the theoretical flow rate and the actual flow rate. 24. The liquid adhesive dispensing system of claim 1 in which said nozzle has a relatively larger diameter upstream body portion formed with a relatively large diameter adhesive liquid flow passage section, and said smaller diameter nose portion is formed with a nozzling passage section smaller in diameter than said upstream passage section. 25. The liquid adhesive dispensing system of claim 1 in which said air cap includes a pair of fan air discharge orifices communicating with a pressurized air source for directing air streams onto opposite sides of the discharging atomized liquid adhesive foam for directing the foam in a flattened pattern for dispensing onto said moving substrate. 26. A liquid dispensing system for dispensing liquid onto a moving substrate comprising: a header having a plurality of liquid spray guns, a liquid supply, a pressurized air supply, said spray guns each having a liquid inlet coupled to said liquid supply for receiving liquid from said liquid supply and a spray nozzle for dispensing liquid from said spray gun onto the moving substrate, said spray guns each having an atomizing air inlet coupled to said pressurized air supply for receiving pressurized air and directing pressurized air to said nozzle for atomizing liquid directed from the spray gun, at least one selectively operable variable speed positive displacement pump coupled between the liquid supply and the spray guns for directing a metered quantity of liquid to the spray guns, said spray guns each including a nozzle body having a liquid flow passage communicating with said liquid inlet, said nozzle liquid flow passage including a relatively small diameter nozzling section and a downstream larger diameter mixing chamber, and said spray guns each having an air atomizing air passage communicating between said atomizing air inlet and said nozzle mixing chamber such that pressurized air directed to said mixing chamber intermixes, atomizes, and creates a fine bubble foam of liquid adhesive prior to discharge from said nozzle and dispensing onto said moving substrate, and a control operable for controlling the operating speed of said at least one positive displacement pump in relation to the rate of movement of said substrate such that a substantially uniform foam is generated and dispensed by said spray guns regardless of the operating speed of the at least one positive displacement pump within an operating range. 27. The liquid dispensing system of claim 26 in which said spray gun includes an air cap mounted in surrounding relation to a discharge end of said nozzle, said nozzle and air cap defining a pressurized air chamber communicating with said atomizing air inlet, said nozzle mixing chamber including an outwardly tapered air interaction section communicating with said nozzling passage section and a downstream cylindrical expansion section communicating with said air interaction section, and said nozzle having a plurality of circumferentially spaced air inlet passages communicating with a tapered side wall of said air interaction passage section for directing a plurality of pressurized air streams into said air interaction section in transverse relation to liquid adhesive discharging from said nozzling section. 28. The liquid dispensing system of claim 26 including a respective positive displacement pump for each said spray gun, and a single selectively operable drive motor for operating the positive displacement pumps for each of the spray guns. 29. The liquid dispensing system of claim 28 in which said drive motor is operable for simultaneously operating the positive displacement pumps of each of said spray guns at a common operating speed. 30. The liquid dispensing system of claim 28 in which said drive motor has a first drive chain for driving the positive displacement pumps of some of said spray guns, and a second drive train for driving the positive displacement pumps of other of said spray guns. 31. The liquid dispensing system of claim 29 in which said positive displacement pumps for each of said spray guns are mounted on a common frame, and said drive motor has an output shaft with a first drive element for driving said first drive train and a second drive element for driving said second drive train. 32. The liquid dispensing system of claim 26 including a sensor for sensing the rate of movement of said substrate. 33. The liquid dispensing system of claim 32 in which said control is operable for controlling the pressure of air supplied to said spray guns in relation to the operating speeds of said positive displacement pumps. 34. The liquid adhesive dispensing system of claim 26 in which said at least one said positive displacement pump has a liquid supply line coupled to said liquid supply and an outlet line coupled to said spray gun, a first sensor for sensing the liquid pressure in said outlet line, a second sensor for sensing the liquid pressure in said inlet line, and said control being operable in response to said sensors sensing a differential in the liquid pressure in said inlet and outlet lines for adjusting the pressure of liquid supplied to said inlet line for equalizing the liquid pressures in said inlet and outlet lines. 35. The liquid dispensing system of claim 34 including a selectively operable pressure regulator for adjustably establishing the pressure of said liquid adhesive supply, and said control being operable in response to said first and second sensors sensing a pressure differential in said inlet and outlet lines for adjusting said pressure regulator and the pressure of said liquid supply for equalizing the liquid pressures in said inlet and outlet lines. 36. The liquid adhesive dispensing system of claim 26 in which said at least one positive displacement pump is a gear pump having a liquid inlet and a liquid outlet, and said gear pump having a pair of intermeshing rotatable gears operable for directing a predetermined quantity of liquid through the pump during each revolution of said gears. 37. A liquid adhesive dispensing system for dispensing liquid adhesive onto a moving substrate comprising a header having at least one spray gun, a liquid adhesive supply, a pressurized air supply, said spray gun having a liquid inlet coupled to said liquid adhesive supply for receiving liquid adhesive from said liquid adhesive supply and a spray nozzle for dispensing liquid adhesive from said spray gun onto the moving substrate, said spray gun having a foaming/atomizing air inlet coupled to said pressurized air supply for receiving pressurized air and directing pressurized air to said spray nozzle, a selectively operable variable speed positive displacement pump coupled between said liquid adhesive supply and said spray gun for directing a metered quantity of liquid adhesive to said spray gun; said nozzle having a liquid adhesive flow passage communicating with said liquid adhesive inlet, said nozzle liquid adhesive flow passage including a relatively small diameter nozzling section for accelerating the flow of liquid adhesive through the nozzle prior to discharge from a discharge orifice thereof, an air cap mounted in surrounding relation to said nozzle and defining an air passageway communicating with said pressurized air supply for receiving pressurized air and directing pressurized air into intermixing relation with liquid adhesive directed from said nozzle discharge orifice for intermixing, atomizing, and creating a fine bubble foam for dispensing onto said moving substrate; and a control for controlling the operating speed of said positive displacement pump for directing liquid adhesive to said spray gun proportional to the speed of the moving substrate, and said control being operable for controlling the pressure of atomizing air supplied to said spray gun in relation to the operating speed of said positive displacement pump such that a substantially uniform foam is generated by said spray gun regardless of the operating speed of the pump within an operating range. 38. The liquid adhesive dispensing system of claim 37 in which said air cap and nozzle define a mixing chamber into which pressurized liquid adhesive and air is directed for intermixing, atomizing, and creating a fine bubble foam prior to discharge from the spray gun.
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