EP1737758B1 - Liquid dispensing method and system with headspace gas removal - Google Patents
Liquid dispensing method and system with headspace gas removal Download PDFInfo
- Publication number
- EP1737758B1 EP1737758B1 EP05734931A EP05734931A EP1737758B1 EP 1737758 B1 EP1737758 B1 EP 1737758B1 EP 05734931 A EP05734931 A EP 05734931A EP 05734931 A EP05734931 A EP 05734931A EP 1737758 B1 EP1737758 B1 EP 1737758B1
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- EP
- European Patent Office
- Prior art keywords
- gas
- liquid
- inner container
- container
- headspace
- 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.)
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- 239000007788 liquid Substances 0.000 title claims abstract description 125
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000004519 manufacturing process Methods 0.000 claims abstract description 50
- 239000012530 fluid Substances 0.000 claims abstract description 30
- 239000000523 sample Substances 0.000 claims abstract description 12
- 230000006835 compression Effects 0.000 claims description 44
- 238000007906 compression Methods 0.000 claims description 44
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims 2
- 239000007789 gas Substances 0.000 abstract description 189
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 10
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 5
- 239000000126 substance Substances 0.000 description 32
- 238000003860 storage Methods 0.000 description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000002401 inhibitory effect Effects 0.000 description 3
- 238000004132 cross linking Methods 0.000 description 2
- 230000002939 deleterious effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 239000002019 doping agent Substances 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229920002120 photoresistant polymer Polymers 0.000 description 1
- 230000002285 radioactive effect Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
- B67D—DISPENSING, DELIVERING OR TRANSFERRING LIQUIDS, NOT OTHERWISE PROVIDED FOR
- B67D7/00—Apparatus or devices for transferring liquids from bulk storage containers or reservoirs into vehicles or into portable containers, e.g. for retail sale purposes
- B67D7/02—Apparatus or devices for transferring liquids from bulk storage containers or reservoirs into vehicles or into portable containers, e.g. for retail sale purposes for transferring liquids other than fuel or lubricants
- B67D7/0238—Apparatus or devices for transferring liquids from bulk storage containers or reservoirs into vehicles or into portable containers, e.g. for retail sale purposes for transferring liquids other than fuel or lubricants utilising compressed air or other gas acting directly or indirectly on liquids in storage containers
- B67D7/0255—Apparatus or devices for transferring liquids from bulk storage containers or reservoirs into vehicles or into portable containers, e.g. for retail sale purposes for transferring liquids other than fuel or lubricants utilising compressed air or other gas acting directly or indirectly on liquids in storage containers squeezing collapsible or flexible storage containers
- B67D7/0261—Apparatus or devices for transferring liquids from bulk storage containers or reservoirs into vehicles or into portable containers, e.g. for retail sale purposes for transferring liquids other than fuel or lubricants utilising compressed air or other gas acting directly or indirectly on liquids in storage containers squeezing collapsible or flexible storage containers specially adapted for transferring liquids of high purity
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D83/00—Containers or packages with special means for dispensing contents
Definitions
- the present invention relates to a storage and dispensing system for the storage and dispensing of liquids.
- the present invention relates to a method and system for dispensing liquid to a manufacturing process from a container including a headspace gas.
- Certain manufacturing processes require the use of liquid chemicals such as acids, solvents, bases, photoresists, dopants, inorganic solutions, organic solutions, biological solutions, pharmaceuticals, and radioactive chemicals.
- Storage and dispensing systems allow alternative containers to be used to deliver liquid chemicals to a manufacturing process at a specified time. These process liquids are usually dispensed from pressurized storage and dispensing containers by special dispensing pumps.
- the containers After filling these containers at a filling facility, the containers are typically shipped to a location for use in a manufacturing process. Once at the manufacturing process facility, these containers may be stored for an extended period of time before being connected to a manufacturing process.
- the purity of some of the above-listed chemicals has a tendency to decay when stored for an extended period of time.
- the color filter chemical used tends to decay as free radicals in the color filter chemical are released during shipment and storage as a result of temperature fluctuations.
- an empty portion of the container referred to as the headspace
- the headspace gas prevents the decay of the liquid chemical by inhibiting chemical reactions from occurring in the liquid during storage.
- a headspace gas including oxygen is introduced into the container at the filling facility, since oxygen has a tendency to scavenge free radicals in the chemical as they are released, thereby preventing the decay of the color filter chemical.
- U.S. Patent No. 3,756,367 discloses a hydraulic brake bleeder including a pressure tank housing containing a resilient bladder having a fill inlet port and an outlet port through the housing.
- the bleeder is pressurized by supplying compressed air to a space in the housing surrounding the bladder.
- An automatic pressure relief valve and manual thumbscrew operated valve are connected to the chamber within the pressure tank external to the bladder. No sensors are disclosed.
- brake fluid contained in the bladder is supplied under pressure to a hydraulic brake system connected to the brake bleeder.
- the present invention is a method and system for dispensing liquid chemical to a manufacturing process from a container including an outer container and an inner container, a portion of the inner container occupied by the liquid chemical, a remainder of the inner container occupied by a headspace gas.
- the system includes a probe having a flow passage therein insertable into an interior of the inner container, and a gas passage communicating between the interior of the inner container and an exterior of the outer container.
- the system further includes means in fluid communication with a space between inner walls of the outer container and the inner container for permitting fluid under pressure to flow into the space between the inner walls of the outer container and the inner container to force the headspace gas out of the inner container via the gas passage to a headspace gas drain and to force liquid out of the inner container through the flow passage in the probe to the manufacturing process.
- the system further includes a drain valve connected between the headspace gas drain and the gas passage.
- the drain valve has an open position selectable to allow the headspace gas to evacuate to the headspace gas drain via the gas passage.
- the drain valve also has a closed position selectable when the headspace gas has been, exhausted from the interior of the inner container.
- the system according to the invention also includes a liquid sensor connected between the gas passage and the headspace gas drain to sense when liquid chemical begins to flow in the gas passage to indicate that the headspace gas has been exhausted from the interior of the inner container.
- the system also preferably includes an empty detect means for detecting when the liquid chemical has been exhausted from the inner container.
- the empty detect means is an empty detect gas sensor. In use, a small amount of empty detect gas is introduced to an interior of the inner container immediately prior to dispensing of the liquid chemical to the manufacturing process. The empty detect gas sensor senses this empty detect gas when the liquid chemical has been exhausted from the container. When the empty detect gas is sensed by the empty detect gas sensor, dispensing of liquid to the manufacturing process is terminated.
- the empty detect means includes a scale for weighing the fluid container while the liquid is dispensed to the manufacturing process such that dispensing of the liquid is terminated when the fluid container reaches a predetermined empty weight as measured by the scale.
- FIG. 1 is a schematic of system 10 according to a preferred embodiment of the present invention for dispensing liquid 12 to manufacturing process 13 from container 14 including headspace 16 filled with headspace gas 18.
- Container 16 includes flexible inner container 20 and rigid outer container 22.
- System 10 further includes compression air or nitrogen supply 30, compression air passage 32, headspace gas passage 34, drain valve 36, liquid sensor 38, headspace gas drain 40, flow passage 42, container scale 44, and system control 46.
- Compression air supply 30 is connected to compression space 31 (i.e., the space between inner walls of outer container 22 and outer surfaces of the inner container 20) via compression air passage 32.
- compression space 31 i.e., the space between inner walls of outer container 22 and outer surfaces of the inner container 20
- compression air passage 32 The interior of inner container 20 is connected to headspace gas drain 40 via gas passage 34. Drain valve 36 and liquid sensor 38 are connected along gas passage 34 between the interior of inner container 20 and headspace gas drain 40. Finally, the interior of inner container 20 is in fluid communication with manufacturing process 13 via flow passage 42.
- Gas passage 34 and flow passage 42 are preferably combined in a single connector package such that the interior of inner container 20 comes into fluid communication with headspace gas drain 40 and manufacturing process 13 with one connection.
- Flow passage 42 is typically provided in a probe that is insertable through a port of the container and into inner container 20 to provide fluid communication between liquid 12 and manufacturing process 13.
- Outer container 22 provides the mechanical support and protection required by flexible inner container 20 (e.g., a flexible polymeric bag) during filling, transport, handling, and dispensing.
- Outer container 22 is typically constructed of metal, although other materials, including plastic materials, may also be used, depending upon government regulatory specifications for handling of the particular liquid to be contained within container 14.
- container 14 is a container as shown in U.S. Pat. No. 5,335,821 to Osgar issued on August 9, 1994 , which is herein incorporated by reference.
- System control 46 which is preferably a microprocessor-based control system, is connected to compression air supply 30, drain valve 36, liquid sensor 38, and container scale 44. System control 46 controls operation of system 10 based upon signals received from the various components of system 10.
- container 14 Prior to attachment to manufacturing process 13, container 14 is filled at a filling facility. During filling, inner container 20 is first inflated with a gas such as nitrogen. Liquid 12 is then introduced through a port in container 14 to fill inner container 20 within outer container 22.
- a gas such as nitrogen
- the purity of some chemicals has a tendency to decay when stored for an extended period of time, especially when subjected to temperature fluctuations.
- the color filter chemical used tends to decay or cross-link as free radicals in the color filter chemical are released during shipment and storage.
- headspace 16 is filled with headspace gas 18.
- Headspace gas 18 prevents the decay of liquid 12 by inhibiting chemical reactions from occurring in liquid 12 during shipment and storage of container 14.
- a headspace gas 18 including oxygen is introduced into inner container 20 at the filling facility, since oxygen has a tendency to scavenge free radicals in the chemical as they are released, thereby preventing the decay or cross-linking of the color filter chemical.
- compression air passage 32, gas passage 34, and flow passage 42 are connected to container 14.
- a signal is then sent by system control 46, which is preferably a microprocessor-based system, to open drain valve 36. This produces a fluidic connection between the interior of inner container 20 and headspace gas drain 40.
- pressurized fluid preferably compressed air or nitrogen, is supplied to compression space 31 by compression air supply 30 to force headspace gas 18 through gas passage 34, through liquid sensor 38, and to headspace gas drain 40.
- any means capable of collapsing inner container 20 to force headspace gas 18 through gas passage 34 may be used, including hydraulic or mechanical based devices.
- a pump connected to gas passage 34 can withdraw headspace gas 18 from container 14.
- liquid 12 begins to flow in gas passage 34 as compressed air supply 30 continues to supply air to compression space 31.
- liquid sensor 38 a signal is sent to system control 46 to close drain valve 36. This terminates the connection between the interior of inner container 20 and headspace gas drain 40.
- a user of system 10 may visually determine when liquid 12 begins to flow in gas passage 34 and manually turn off drain valve 36 to terminate the connection to headspace gas drain 40.
- liquid 12 is forced up through flow passage 42 as compressed air continues to be supplied to compression space 31 by compressed air supply 30.
- compressed air supply 30 As liquid 12 is withdrawn from flexible inner container 20 of container 14, air is permitted to enter compression space 31, thereby collapsing inner container 20.
- inner container 20 is preferably collapsed with pressurized air, any means capable of collapsing inner container 20 to force liquid through flow passage 42 may be used, including hydraulic or mechanical based devices.
- a pump or venturi connected to flow passage 42 can withdraw liquid 12 from container 14.
- headspace gas 18 would begin to dissolve into solution pursuant to Henry's law.
- Henry's law states that, at a constant temperature, the amount of gas dissolved in a solution is directly proportional to the pressure of the gas above the solution.
- inner container 20 is collapsed by compressed air supply 30 to force liquid 12 out of inner container 20, the pressure of headspace gas 18 would increase during this process. This would cause headspace gas 18 to dissolve into liquid 12, thereby resulting in deleterious bubble formation when liquid 12 is del ivered to process 13.
- Container scale 44 continually weighs container 14 as liquid 12 is dispensed to manufacturing process 13 to determine when container 14 reaches a predetermined empty weight.
- the empty weight of container 14 is the weight of outer container 22 with an empty inner container 20 inside. The determination of the empty weight by container scale 44 assures that all of liquid 12 is dispensed from inner container 20.
- system control 46 sends a signal to turn off compression air supply 30. Subsequently, compression air passage 32, gas passage 34, and flow passage 42 are disconnected from empty container 14, empty container 14 is removed from system 10, and a new container 14 containing liquid 12 and headspace gas 18 is connected to system 10. Dispensing of liquid 12 from container 14 then recommences.
- FIG. 2 is a schematic of system 50 according to another preferred embodiment of the present invention for dispensing liquid 12 to manufacturing process 13 from container 14.
- Container 14 includes headspace gas 18 provided to stabilize liquid 12 during shipment and storage of container 14.
- Container 16 includes flexible inner container 20 and rigid outer container 22.
- system 50 includes compression air supply 30, compression air passage 32, headspace gas passage 34, liquid sensor 38, headspace gas drain 40, flow passage 42, and system control 46.
- system 50 includes empty detect gas supply 52, regulator gauge 54, first block valve 55, gas quantity controller 56, second block valve 58, select valve 60, and empty detect gas sensor 62.
- Compression air supply 30 is connected to compression space 31 via compression air passage 32.
- Select valve 60 is a three-port valve connecting the interior of inner container 20 (via gas passage 34) to the devices connected to select valve port 60a or select valve port 60b, depending on the position state of select valve 60. More specifically, in a first position select valve 60 provides a fluidic connection between the interior of inner container 20 and the devices connected to port 60a (i.e., liquid sensor 38 and headspace gas drain 40). Liquid sensor 38 is connected between select valve 60 and headspace gas drain 40.
- select valve 60 provides a fluidic connection between the interior of inner container 20 and the devices connected to port 60b (i.e., empty detect gas supply 52, regulator gauge 54, first block valve 55, gas quantity controller 56, and second block valve 58).
- Regulator gauge 54, first block valve 55, gas quantity controller 56, and second block valve 58 are connected between empty detect gas supply 52 and select valve 60.
- the interior of inner container 20 is in fluid communication with manufacturing process 13 via flow passage 42.
- Empty detect gas sensor 62 is connected along flow passage 42.
- Gas passage 34, flow passage 42, and select valve 60 are preferably combined in a single connector package such that the interior of inner container 20 is connected to headspace gas drain 40, empty detect gas supply 52, and manufacturing process 13 with one connection.
- Flow passage 42 is typically provided in a probe that is insertable through a port of the container and into inner container 20 to provide fluid communication between liquid 12 and manufacturing process 13.
- system control 46 is connected to compression air supply 30, liquid sensor 38, regulator gauge 54, first block valve 55, second block valve 58, select valve 60, and empty detect gas sensor 62.
- System control 46 controls operation of system 50 based upon signals received from the various components of system 50.
- headspace gas 18 is no longer needed or desired. Thus, headspace gas 18 must be removed prior to dispensing liquid 12 to manufacturing process 13.
- the procedure of removing headspace gas 18 from container 14 in system 50 is similar to the same process in system 10.
- compression air passage 32, gas passage 34, and flow passage 42 are connected to container 14.
- System control 46 then sends a signal select valve 60 to turn to its first position to produce a fluidic connection between the interior of inner container 20 and headspace gas drain 40 (via select valve port 60a).
- select valve port 60a select valve port 60a
- pressurized fluid preferably compressed air or nitrogen
- compressed air supply 30 to compression space 31 to force headspace gas 18 through gas passage 34, through liquid sensor 38, and to headspace gas drain 40.
- pressurized fluid preferably compressed air or nitrogen
- compressed air supply 30 to compress space 31 to force headspace gas 18 through gas passage 34, through liquid sensor 38, and to headspace gas drain 40.
- pressurized fluid preferably compressed air or nitrogen
- gas passage 34 As headspace gas 18 is withdrawn from inner container 20 of container 14, air is permitted to enter compression space 31, thereby collapsing flexible inner container 20.
- any means capable of collapsing inner container 20 to force headspace gas 18 through gas passage 34 may be used, including hydraulic or mechanical based devices.
- a pump or venturi connected to gas passage 34 can withdraw headspace gas 18 from container 14.
- liquid 12 begins to flow in gas passage 34 as compressed air supply 30 continues to supply air to compression space 31.
- system control 46 responds by turning select valve 60 to the second position. This terminates the connection between the interior of inner container 20 and headspace gas drain 40, and opens the connection between the interior of inner container 20 and select valve port 60b.
- a user of system 50 may visually determine when liquid 12 begins to flow in gas passage 34 and manually turn select valve 60 to the second position to terminate the connection to headspace gas drain 40.
- headspace gas 18 would begin to dissolve into solution pursuant to Henry's law. Because inner container 20 is collapsed by compressed air supply 30 to force liquid 12 out of inner container 20, the pressure of headspace gas 18 would increase during this process. This would cause headspace gas 18 to dissolve into liquid 12, thereby resulting in deleterious bubble formation in liquid 12 as it is delivered to process 13.
- empty detect gas In many liquid dispense systems, it is desirable to leave a small amount of gas in container 14 after removal of headspace gas 18. When all of liquid 12 has been dispensed from container 14, this small amount of gas, referred to as empty detect gas, is detected by a sensor (for example, empty detect gas sensor 62 in FIG. 2 ) to indicate that the container is empty. In conventional systems, the amount of empty detect gas remaining in container 14 is not easily controllable, since the amount of gas being exhausted to headspace gas drain 40 is not easily measurable.
- empty detect gas supply 52 In system 50, the addition of empty detect gas into inner container 20 is controlled by empty detect gas supply 52, regulator gauge 54, first block valve 55, gas quantity controller 56, and second block valve 58.
- system control 46 opens first block valve 55 to produce a fluidic connection between empty detect gas supply 52 and gas quantity controller 56.
- Empty detect gas then begins to flow into gas quantity controller 56 from empty detect gas supply 52.
- the pressure is regulated by regulator gauge 54 and may be measured by a pressure transducer integrated into gas quantity controller 56.
- the amount of empty detect gas that flows into gas quantity controller 56 depends on the capacity volume of gas quantity controller 56 and the pressure of the empty detect gas in gas quantity controller 56. Based on these factors, empty detect gas supply 52 continues to flow until gas quantity controller 56 is filled with the desired amount of gas (e.g., 100 pounds per square inch gauge).
- system control 46 closes first block valve 55 to terminate the connection between empty detect gas supply 52 and gas quantity controller 56. Subsequently or simultaneously, system control 46 opens second block valve 58 to produce a fluidic connection between gas quantity controller 56 and the interior of inner container 20. This allows the empty detect gas contained in gas quantity controller 56 to flow into the interior of inner container 20. If compression air supply 30 is turned off while empty detect gas flows from gas quantity controller 56 into inner container 20, the empty detect gas contained in gas quantity controller 56 will flow into inner container 20. If compression air supply 30 remains active while empty detect gas flows from gas quantity controller 56 into inner container 20, empty detect gas will flow from gas quantity controller 56 into inner container 20 until an equilibrium pressure is reached between compression air supply 30 and the pressure in gas quantity controller 56.
- compression air supply 30 is active is controlled by a two-way or a three-way valve connected between compression air supply 30 and compression space 31.
- the amount of empty detect gas that flows from gas quantity controller 56 into inner container 20 is based on the size of gas quantity controller 56, the difference in pressure between gas quantity controller 56, and the pressure in compression space 31.
- system control 46 closes second block valve 58 to terminate the connection from gas quantity controller 56 to inner container 20.
- second block valve 58 is closed, liquid 12 is forced up through flow passage 42 as compressed air is supplied to compression space 31 by compressed air supply 30.
- compressed air supply 30 As liquid 12 is withdrawn from flexible inner container 20 of container 14, air is permitted to enter compression space 31, thereby collapsing inner container 20.
- inner container 20 is preferably collapsed with pressurized air, any means capable of collapsing inner container 20 to force liquid through flow passage 42 may be used, including hydraulic or mechanical based devices.
- a pump or venturi connected to flow passage 42 can withdraw liquid 12 from container 14.
- the purity of some chemicals has a tendency to decay or cross-link when stored for an extended period of time, especially when subjected to temperature fluctuations.
- an empty portion of the container referred to as the headspace
- the headspace gas prevents the decay of the liquid chemical by inhibiting chemical reactions from occurring in the liquid during storage.
- the container is to be connected to a manufacturing process, the headspace gas is no longer needed or desired.
- Conventional dispensing systems do not allow for the easy removal of the headspace gas prior to dispensing the liquid chemical.
- the present invention is a method and system for dispensing liquid chemical to a manufacturing process from a container including an outer container, an inner container, and a port which communicates with an interior of the inner container, a portion of the inner container occupied by the liquid chemical, a remainder of the inner container occupied by a headspace gas for preventing decay of the liquid chemical until the container is connected to a manufacturing process.
- the system includes a probe having a flow passage therein and a gas passage communicating between the interior of the inner container and an exterior of the outer container.
- the system further includes means in fluid communication with a compression space between inner walls of the outer container and the inner container for permitting fluid under pressure to flow into the space between the inner walls of the outer container and the inner container to force the headspace gas out of the inner container via the gas passage to a headspace gas drain and to force liquid out of the inner container through the flow passage in the probe to the manufacturing process.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
- Sampling And Sample Adjustment (AREA)
- Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
- Loading And Unloading Of Fuel Tanks Or Ships (AREA)
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Abstract
Description
- The present invention relates to a storage and dispensing system for the storage and dispensing of liquids. In particular, the present invention relates to a method and system for dispensing liquid to a manufacturing process from a container including a headspace gas.
- Certain manufacturing processes require the use of liquid chemicals such as acids, solvents, bases, photoresists, dopants, inorganic solutions, organic solutions, biological solutions, pharmaceuticals, and radioactive chemicals. Storage and dispensing systems allow alternative containers to be used to deliver liquid chemicals to a manufacturing process at a specified time. These process liquids are usually dispensed from pressurized storage and dispensing containers by special dispensing pumps.
- After filling these containers at a filling facility, the containers are typically shipped to a location for use in a manufacturing process. Once at the manufacturing process facility, these containers may be stored for an extended period of time before being connected to a manufacturing process. However, the purity of some of the above-listed chemicals has a tendency to decay when stored for an extended period of time. For example, in the manufacture of thin film transistor flat panel displays, the color filter chemical used tends to decay as free radicals in the color filter chemical are released during shipment and storage as a result of temperature fluctuations. To prevent this from occurring, an empty portion of the container, referred to as the headspace, is filled with a headspace gas. The headspace gas prevents the decay of the liquid chemical by inhibiting chemical reactions from occurring in the liquid during storage. For example, in the case of the color filter chemical, a headspace gas including oxygen is introduced into the container at the filling facility, since oxygen has a tendency to scavenge free radicals in the chemical as they are released, thereby preventing the decay of the color filter chemical.
- When the container is to be connected to the manufacturing process, the headspace gas is no longer needed or desired. Thus, the headspace gas must be removed prior to dispensing the liquid to the manufacturing process. However, caution must be exercised to avoid agitating the container or forcing the headspace gas into the liquid chemical while draining the headspace gas. The introduction of gas into the liquid chemical may result in the formation of air bubbles in the chemical, which can render the liquid chemical defective for use in the manufacturing process.
Various pressure dispensing apparatuses are known. As one example,U.S. Patent No. 3,756,367 discloses a hydraulic brake bleeder including a pressure tank housing containing a resilient bladder having a fill inlet port and an outlet port through the housing. The bleeder is pressurized by supplying compressed air to a space in the housing surrounding the bladder. An automatic pressure relief valve and manual thumbscrew operated valve are connected to the chamber within the pressure tank external to the bladder. No sensors are disclosed. When the tank is pressurized, brake fluid contained in the bladder is supplied under pressure to a hydraulic brake system connected to the brake bleeder. - Furthermore, it may be desired to leave a small amount of gas in the container after removal of the headspace gas. When all of the liquid has been dispensed from the container, this small amount of empty detect gas is detected by the dispenser to indicate that the container is empty. In conventional systems, the amount of empty detect gas remaining in the container is not easily controllable.
- Thus, a system that allows for easy removal of headspace gas and, if desired, easy regulation of the amount of empty detect gas remaining in the container after headspace gas removal is desirable.
- The present invention is a method and system for dispensing liquid chemical to a manufacturing process from a container including an outer container and an inner container, a portion of the inner container occupied by the liquid chemical, a remainder of the inner container occupied by a headspace gas. The system includes a probe having a flow passage therein insertable into an interior of the inner container, and a gas passage communicating between the interior of the inner container and an exterior of the outer container. The system further includes means in fluid communication with a space between inner walls of the outer container and the inner container for permitting fluid under pressure to flow into the space between the inner walls of the outer container and the inner container to force the headspace gas out of the inner container via the gas passage to a headspace gas drain and to force liquid out of the inner container through the flow passage in the probe to the manufacturing process.
- In a preferred embodiment, the system further includes a drain valve connected between the headspace gas drain and the gas passage. The drain valve has an open position selectable to allow the headspace gas to evacuate to the headspace gas drain via the gas passage. The drain valve also has a closed position selectable when the headspace gas has been, exhausted from the interior of the inner container. The system according to the invention also includes a liquid sensor connected between the gas passage and the headspace gas drain to sense when liquid chemical begins to flow in the gas passage to indicate that the headspace gas has been exhausted from the interior of the inner container.
- The system also preferably includes an empty detect means for detecting when the liquid chemical has been exhausted from the inner container. In one embodiment, the empty detect means is an empty detect gas sensor. In use, a small amount of empty detect gas is introduced to an interior of the inner container immediately prior to dispensing of the liquid chemical to the manufacturing process. The empty detect gas sensor senses this empty detect gas when the liquid chemical has been exhausted from the container. When the empty detect gas is sensed by the empty detect gas sensor, dispensing of liquid to the manufacturing process is terminated. In another embodiment, the empty detect means includes a scale for weighing the fluid container while the liquid is dispensed to the manufacturing process such that dispensing of the liquid is terminated when the fluid container reaches a predetermined empty weight as measured by the scale.
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FIG. 1 is a schematic of a system according to a preferred embodiment of the present invention for dispensing liquid to a manufacturing process from a container including a headspace gas provided to stabilize the liquid during shipment and storage of the container. -
FIG. 2 is a schematic of a system according to another preferred embodiment of the present invention for dispensing liquid to a manufacturing process from a container including a headspace gas provided to stabilize the liquid during shipment and storage of the container. -
FIG. 1 is a schematic ofsystem 10 according to a preferred embodiment of the present invention for dispensingliquid 12 tomanufacturing process 13 fromcontainer 14 includingheadspace 16 filled withheadspace gas 18.Container 16 includes flexibleinner container 20 and rigidouter container 22.System 10 further includes compression air ornitrogen supply 30,compression air passage 32,headspace gas passage 34,drain valve 36,liquid sensor 38,headspace gas drain 40,flow passage 42,container scale 44, andsystem control 46. -
Compression air supply 30 is connected to compression space 31 (i.e., the space between inner walls ofouter container 22 and outer surfaces of the inner container 20) viacompression air passage 32. The interior ofinner container 20 is connected toheadspace gas drain 40 viagas passage 34.Drain valve 36 andliquid sensor 38 are connected alonggas passage 34 between the interior ofinner container 20 andheadspace gas drain 40. Finally, the interior ofinner container 20 is in fluid communication withmanufacturing process 13 viaflow passage 42. -
Gas passage 34 andflow passage 42 are preferably combined in a single connector package such that the interior ofinner container 20 comes into fluid communication withheadspace gas drain 40 andmanufacturing process 13 with one connection.Flow passage 42 is typically provided in a probe that is insertable through a port of the container and intoinner container 20 to provide fluid communication betweenliquid 12 andmanufacturing process 13. -
Outer container 22 provides the mechanical support and protection required by flexible inner container 20 (e.g., a flexible polymeric bag) during filling, transport, handling, and dispensing.Outer container 22 is typically constructed of metal, although other materials, including plastic materials, may also be used, depending upon government regulatory specifications for handling of the particular liquid to be contained withincontainer 14. Preferably,container 14 is a container as shown inU.S. Pat. No. 5,335,821 to Osgar issued on August 9, 1994 , which is herein incorporated by reference. -
System control 46, which is preferably a microprocessor-based control system, is connected tocompression air supply 30,drain valve 36,liquid sensor 38, andcontainer scale 44.System control 46 controls operation ofsystem 10 based upon signals received from the various components ofsystem 10. - Prior to attachment to
manufacturing process 13,container 14 is filled at a filling facility. During filling,inner container 20 is first inflated with a gas such as nitrogen. Liquid 12 is then introduced through a port incontainer 14 to fillinner container 20 withinouter container 22. - The purity of some chemicals has a tendency to decay when stored for an extended period of time, especially when subjected to temperature fluctuations. For example, in the manufacture of thin film transistor flat panel displays, the color filter chemical used tends to decay or cross-link as free radicals in the color filter chemical are released during shipment and storage. To prevent this from occurring, an empty portion of the container,
headspace 16, is filled withheadspace gas 18.Headspace gas 18 prevents the decay ofliquid 12 by inhibiting chemical reactions from occurring inliquid 12 during shipment and storage ofcontainer 14. For example, in the case of the color filter chemical, aheadspace gas 18 including oxygen is introduced intoinner container 20 at the filling facility, since oxygen has a tendency to scavenge free radicals in the chemical as they are released, thereby preventing the decay or cross-linking of the color filter chemical. - When
container 14 is to be connected tomanufacturing process 13,headspace gas 18 is no longer needed or desired. Thus,headspace gas 18 must be removed prior to dispensingliquid 12 tomanufacturing process 13. To begin,compression air passage 32,gas passage 34, and flowpassage 42 are connected tocontainer 14. A signal is then sent bysystem control 46, which is preferably a microprocessor-based system, to opendrain valve 36. This produces a fluidic connection between the interior ofinner container 20 andheadspace gas drain 40. Subsequently, pressurized fluid, preferably compressed air or nitrogen, is supplied tocompression space 31 bycompression air supply 30 to forceheadspace gas 18 throughgas passage 34, throughliquid sensor 38, and toheadspace gas drain 40. Asheadspace gas 18 is withdrawn frominner container 20 ofcontainer 14, air is permitted to entercompression space 31, thereby collapsing flexibleinner container 20. Whileinner container 20 is preferably collapsed with pressurized air, any means capable of collapsinginner container 20 to forceheadspace gas 18 throughgas passage 34 may be used, including hydraulic or mechanical based devices. Alternatively, a pump connected togas passage 34 can withdrawheadspace gas 18 fromcontainer 14. - After
headspace gas 18 has been exhausted frominner container 20,liquid 12 begins to flow ingas passage 34 ascompressed air supply 30 continues to supply air tocompression space 31. When liquid 12 reachesliquid sensor 38, a signal is sent tosystem control 46 to closedrain valve 36. This terminates the connection between the interior ofinner container 20 andheadspace gas drain 40. Alternatively, a user ofsystem 10 may visually determine when liquid 12 begins to flow ingas passage 34 and manually turn offdrain valve 36 to terminate the connection toheadspace gas drain 40. - When the connection between the interior of
inner container 20 andheadspace gas drain 40 has been terminated, liquid 12 is forced up throughflow passage 42 as compressed air continues to be supplied tocompression space 31 bycompressed air supply 30. Asliquid 12 is withdrawn from flexibleinner container 20 ofcontainer 14, air is permitted to entercompression space 31, thereby collapsinginner container 20. Whileinner container 20 is preferably collapsed with pressurized air, any means capable of collapsinginner container 20 to force liquid throughflow passage 42 may be used, including hydraulic or mechanical based devices. Alternatively, a pump or venturi connected to flowpassage 42 can withdraw liquid 12 fromcontainer 14. - At this point, it is important to note that had
headspace gas 18 not been removed prior to dispensingliquid 12 tomanufacturing process 13,headspace gas 18 would begin to dissolve into solution pursuant to Henry's law. Henry's law states that, at a constant temperature, the amount of gas dissolved in a solution is directly proportional to the pressure of the gas above the solution. Thus, becauseinner container 20 is collapsed bycompressed air supply 30 to force liquid 12 out ofinner container 20, the pressure ofheadspace gas 18 would increase during this process. This would causeheadspace gas 18 to dissolve intoliquid 12, thereby resulting in deleterious bubble formation when liquid 12 is del ivered to process 13. - As
liquid 12 is being dispensed tomanufacturing process 13, the weight ofcontainer 14 decreases.Container scale 44 continually weighscontainer 14 asliquid 12 is dispensed tomanufacturing process 13 to determine whencontainer 14 reaches a predetermined empty weight. The empty weight ofcontainer 14 is the weight ofouter container 22 with an emptyinner container 20 inside. The determination of the empty weight bycontainer scale 44 assures that all of liquid 12 is dispensed frominner container 20. - When
container scale 44 determines thatcontainer 14 is empty,system control 46 sends a signal to turn offcompression air supply 30. Subsequently,compression air passage 32,gas passage 34, and flowpassage 42 are disconnected fromempty container 14,empty container 14 is removed fromsystem 10, and anew container 14 containingliquid 12 andheadspace gas 18 is connected tosystem 10. Dispensing of liquid 12 fromcontainer 14 then recommences. -
FIG. 2 is a schematic ofsystem 50 according to another preferred embodiment of the present invention for dispensingliquid 12 tomanufacturing process 13 fromcontainer 14.Container 14 includesheadspace gas 18 provided to stabilize liquid 12 during shipment and storage ofcontainer 14.Container 16 includes flexibleinner container 20 and rigidouter container 22. Similar tosystem 10 shown inFIG. 1 ,system 50 includescompression air supply 30,compression air passage 32,headspace gas passage 34,liquid sensor 38,headspace gas drain 40,flow passage 42, andsystem control 46. Additionally,system 50 includes empty detectgas supply 52,regulator gauge 54,first block valve 55,gas quantity controller 56,second block valve 58, select valve 60, and empty detectgas sensor 62. -
Compression air supply 30 is connected tocompression space 31 viacompression air passage 32. Select valve 60 is a three-port valve connecting the interior of inner container 20 (via gas passage 34) to the devices connected to selectvalve port 60a orselect valve port 60b, depending on the position state of select valve 60. More specifically, in a first position select valve 60 provides a fluidic connection between the interior ofinner container 20 and the devices connected toport 60a (i.e.,liquid sensor 38 and headspace gas drain 40).Liquid sensor 38 is connected between select valve 60 andheadspace gas drain 40. In a second position, select valve 60 provides a fluidic connection between the interior ofinner container 20 and the devices connected toport 60b (i.e., empty detectgas supply 52,regulator gauge 54,first block valve 55,gas quantity controller 56, and second block valve 58).Regulator gauge 54,first block valve 55,gas quantity controller 56, andsecond block valve 58 are connected between empty detectgas supply 52 and select valve 60. Finally, the interior ofinner container 20 is in fluid communication withmanufacturing process 13 viaflow passage 42. Empty detectgas sensor 62 is connected alongflow passage 42. -
Gas passage 34,flow passage 42, and select valve 60 are preferably combined in a single connector package such that the interior ofinner container 20 is connected toheadspace gas drain 40, empty detectgas supply 52, andmanufacturing process 13 with one connection.Flow passage 42 is typically provided in a probe that is insertable through a port of the container and intoinner container 20 to provide fluid communication betweenliquid 12 andmanufacturing process 13. - In the embodiment shown in
FIG. 2 ,system control 46 is connected tocompression air supply 30,liquid sensor 38,regulator gauge 54,first block valve 55,second block valve 58, select valve 60, and empty detectgas sensor 62.System control 46 controls operation ofsystem 50 based upon signals received from the various components ofsystem 50. - As described above, when
container 14 is to be connected tomanufacturing process 13,headspace gas 18 is no longer needed or desired. Thus,headspace gas 18 must be removed prior to dispensingliquid 12 tomanufacturing process 13. The procedure of removingheadspace gas 18 fromcontainer 14 insystem 50 is similar to the same process insystem 10. To begin,compression air passage 32,gas passage 34, and flowpassage 42 are connected tocontainer 14.System control 46 then sends a signal select valve 60 to turn to its first position to produce a fluidic connection between the interior ofinner container 20 and headspace gas drain 40 (viaselect valve port 60a). A user ofsystem 50 may also manually turn select valve 60 to its first position. Subsequently, pressurized fluid, preferably compressed air or nitrogen, is supplied bycompressed air supply 30 tocompression space 31 to forceheadspace gas 18 throughgas passage 34, throughliquid sensor 38, and toheadspace gas drain 40. Asheadspace gas 18 is withdrawn frominner container 20 ofcontainer 14, air is permitted to entercompression space 31, thereby collapsing flexibleinner container 20. Whileinner container 20 is preferably collapsed with pressurized air, any means capable of collapsinginner container 20 to forceheadspace gas 18 throughgas passage 34 may be used, including hydraulic or mechanical based devices. Alternatively, a pump or venturi connected togas passage 34 can withdrawheadspace gas 18 fromcontainer 14. - After
headspace gas 18 has been exhausted frominner container 20,liquid 12 begins to flow ingas passage 34 ascompressed air supply 30 continues to supply air tocompression space 31. When liquid 12 reachesliquid sensor 38,system control 46 responds by turning select valve 60 to the second position. This terminates the connection between the interior ofinner container 20 andheadspace gas drain 40, and opens the connection between the interior ofinner container 20 andselect valve port 60b. Alternatively, a user ofsystem 50 may visually determine when liquid 12 begins to flow ingas passage 34 and manually turn select valve 60 to the second position to terminate the connection toheadspace gas drain 40. - At this point, it is important to note again that, had
headspace gas 18 not been removed prior to dispensingliquid 12 tomanufacturing process 13,headspace gas 18 would begin to dissolve into solution pursuant to Henry's law. Becauseinner container 20 is collapsed bycompressed air supply 30 to force liquid 12 out ofinner container 20, the pressure ofheadspace gas 18 would increase during this process. This would causeheadspace gas 18 to dissolve intoliquid 12, thereby resulting in deleterious bubble formation inliquid 12 as it is delivered to process 13. - In many liquid dispense systems, it is desirable to leave a small amount of gas in
container 14 after removal ofheadspace gas 18. When all of liquid 12 has been dispensed fromcontainer 14, this small amount of gas, referred to as empty detect gas, is detected by a sensor (for example, empty detectgas sensor 62 inFIG. 2 ) to indicate that the container is empty. In conventional systems, the amount of empty detect gas remaining incontainer 14 is not easily controllable, since the amount of gas being exhausted toheadspace gas drain 40 is not easily measurable. - In
system 50, the addition of empty detect gas intoinner container 20 is controlled by empty detectgas supply 52,regulator gauge 54,first block valve 55,gas quantity controller 56, andsecond block valve 58. To begin,system control 46 opensfirst block valve 55 to produce a fluidic connection between empty detectgas supply 52 andgas quantity controller 56. Empty detect gas then begins to flow intogas quantity controller 56 from empty detectgas supply 52. Asgas quantity controller 56 fills with empty detect gas, the pressure ingas quantity controller 56 increases. The pressure is regulated byregulator gauge 54 and may be measured by a pressure transducer integrated intogas quantity controller 56. The amount of empty detect gas that flows intogas quantity controller 56 depends on the capacity volume ofgas quantity controller 56 and the pressure of the empty detect gas ingas quantity controller 56. Based on these factors, empty detectgas supply 52 continues to flow untilgas quantity controller 56 is filled with the desired amount of gas (e.g., 100 pounds per square inch gauge). - When the desired amount of gas has filled
gas quantity controller 56,system control 46 closesfirst block valve 55 to terminate the connection between empty detectgas supply 52 andgas quantity controller 56. Subsequently or simultaneously,system control 46 openssecond block valve 58 to produce a fluidic connection betweengas quantity controller 56 and the interior ofinner container 20. This allows the empty detect gas contained ingas quantity controller 56 to flow into the interior ofinner container 20. Ifcompression air supply 30 is turned off while empty detect gas flows fromgas quantity controller 56 intoinner container 20, the empty detect gas contained ingas quantity controller 56 will flow intoinner container 20. Ifcompression air supply 30 remains active while empty detect gas flows fromgas quantity controller 56 intoinner container 20, empty detect gas will flow fromgas quantity controller 56 intoinner container 20 until an equilibrium pressure is reached betweencompression air supply 30 and the pressure ingas quantity controller 56. Typically, whethercompression air supply 30 is active is controlled by a two-way or a three-way valve connected betweencompression air supply 30 andcompression space 31. In general, the amount of empty detect gas that flows fromgas quantity controller 56 intoinner container 20 is based on the size ofgas quantity controller 56, the difference in pressure betweengas quantity controller 56, and the pressure incompression space 31. - After empty detect gas has stopped flowing from
gas quantity controller 56,system control 46 closessecond block valve 58 to terminate the connection fromgas quantity controller 56 toinner container 20. Aftersecond block valve 58 is closed, liquid 12 is forced up throughflow passage 42 as compressed air is supplied tocompression space 31 bycompressed air supply 30. Asliquid 12 is withdrawn from flexibleinner container 20 ofcontainer 14, air is permitted to entercompression space 31, thereby collapsinginner container 20. Whileinner container 20 is preferably collapsed with pressurized air, any means capable of collapsinginner container 20 to force liquid throughflow passage 42 may be used, including hydraulic or mechanical based devices. Alternatively, a pump or venturi connected to flowpassage 42 can withdraw liquid 12 fromcontainer 14. - As
inner container 20 is collapsed bycompression air supply 30,liquid 12 continues to flow tomanufacturing process 13 untilliquid 12 is exhausted frominner container 20. Afterliquid 12 has been exhausted frominner container 20, only the empty detect gas remains ininner container 20. Ascompression air supply 30 continues to compressinner container 20, the empty detect gas is forced throughflow passage 42 towardmanufacturing process 13. When the empty detect gas passes through empty detectgas sensor 62, empty detectgas sensor 62 sends a signal tosystem control 46 to turn offcompression air supply 30, thereby terminating operation ofsystem 50. Subsequently,compression air passage 32,gas passage 34, and flowpassage 42 are disconnected fromempty container 14,empty container 14 is removed fromsystem 50, and anew container 14 containingliquid 12 andheadspace gas 18 is connected tosystem 50. Dispensing of liquid 12 fromcontainer 14 then recommences. - In summary, the purity of some chemicals has a tendency to decay or cross-link when stored for an extended period of time, especially when subjected to temperature fluctuations. To prevent this decay or cross-linking from occurring, an empty portion of the container, referred to as the headspace, is filled with a headspace gas. The headspace gas prevents the decay of the liquid chemical by inhibiting chemical reactions from occurring in the liquid during storage. When the container is to be connected to a manufacturing process, the headspace gas is no longer needed or desired. Conventional dispensing systems do not allow for the easy removal of the headspace gas prior to dispensing the liquid chemical. The present invention is a method and system for dispensing liquid chemical to a manufacturing process from a container including an outer container, an inner container, and a port which communicates with an interior of the inner container, a portion of the inner container occupied by the liquid chemical, a remainder of the inner container occupied by a headspace gas for preventing decay of the liquid chemical until the container is connected to a manufacturing process. The system includes a probe having a flow passage therein and a gas passage communicating between the interior of the inner container and an exterior of the outer container. The system further includes means in fluid communication with a compression space between inner walls of the outer container and the inner container for permitting fluid under pressure to flow into the space between the inner walls of the outer container and the inner container to force the headspace gas out of the inner container via the gas passage to a headspace gas drain and to force liquid out of the inner container through the flow passage in the probe to the manufacturing process.
- Although the present invention has been described with reference to preferred embodiments, workers skilled in the art will recognize that changes may be made in form and detail without departing from the scope of the invention as defined in the claims.
Claims (19)
- A method of dispensing a liquid from a collapsible inner container (20) arranged within an outer container (22), the inner container (20) initially containing liquid (12) and headspace gas (18), the method comprising:evacuating the headspace gas (18) from the inner container (20) via a gas passage (34) in communication with a headspace gas drain (40);utilizing a liquid sensor (38) to sense when liquid (12) begins to flow in the gas passage (34), by detecting presence of liquid (12) in the gas passage (34); andsupplying pressure to a compression space (31) between the inner container (20) and the outer container (22) to dispense liquid (12) from the inner container (20) to a manufacturing process (13).
- A method according to claim 1, wherein the supplying of pressure to the compression space (31) comprises supplying fluid under pressure from a pressurized fluid source (30) to the compression space (31) between the inner container (20) and the outer container (22).
- A method according to any one of claims 1 or 2, wherein the inner container (20) and the outer container (22) embody a fluid container (16), and prior to evacuating the headspace gas (18), the method further comprises: attaching a connector to the fluid container (16), the connector including a probe having a liquid flow passage (42) therein for dispensing of liquid (12) from the inner container (20), the connector further including the gas passage (34).
- A method according to any one of claims 1 to 3, wherein evacuating the headspace gas comprises opening a drain valve (36) connected between the gas passage (34) and the headspace gas drain (40) to allow the headspace gas (18) to evacuate to the headspace gas drain (40) via the gas passage (34); and closing the drain valve (36) responsive to detection by the liquid sensor (38) of when the liquid (12) begins to flow in the gas passage (34).
- A method according to claim 4, wherein prior to closing the drain valve (36), the method further comprises supplying fluid under pressure to a compression space (31) between the inner container (20) and the outer container (22) to evacuate the headspace gas (18) from the inner container (20) via the gas passage (34) and the headspace gas drain (40).
- A method according to claim 1, wherein the dispensing of liquid (12) from the inner container (20) further comprises use of a pump or venturi to withdraw liquid (12) from the inner container (20).
- A method according to claim 1, wherein prior to dispensing liquid (12) from the inner container (20), the method further comprises introducing an amount of empty detect gas into the inner container (20).
- A method according to claim 7, wherein introducing an amount of empty detect gas into the inner container (20) comprises: connecting a first block valve (55), a gas quantity controller (56), and a second block valve (58) between an empty detect gas supply (52) and the gas passage (34); opening the first block valve (55) to allow the empty detect gas to flow from the empty detect gas supply (52) into the gas quantity controller (56); closing the first block valve (55) when a measured quantity of empty detect gas has filled the gas quantity controller (56); and opening the second block valve (58) to allow the empty detect gas to flow from the gas quantity controller (56) into the interior of the inner container (20) via the gas passage (34).
- A method according to claim 8, wherein closing the first block valve (55) when a measured quantity of empty detect gas has filled the gas quantity controller (56) comprises: connecting a pressure regulator gauge (54) between the empty detect gas supply (52) and the gas quantity controller (56) for regulating the pressure in the gas quantity controller (56) as the empty detect gas is introduced into the gas quantity controller (56); and closing the first block valve (55) when the measured quantity of empty detect gas has been introduced into the gas quantity controller (56) based upon the pressure in the gas quantity controller (56).
- A method according to claim 7, further comprising: sensing the empty detect gas when the liquid (12) has been exhausted from the inner container (20); and terminating dispensing of the liquid (12) to the manufacturing process (13) when the empty detect gas is sensed.
- A method according to claim 1, wherein the inner container (20) and the outer container (22) embody a fluid container (16), the method further comprising: weighing the fluid container (16) while the liquid (12) is dispensed to the manufacturing process (13); and terminating dispensing of the liquid (12) to the manufacturing process (13) when the fluid container (16) reaches an empty weight.
- A system for dispensing liquid to a manufacturing process (13) from a fluid container (16) including an outer container (22) and a collapsible inner container (20), the inner container (20) initially containing the liquid (12) and a headspace gas (18), the system comprising:a connector including a probe insertable into the inner container (20), the probe having a liquid flow passage (42) thereina gas passage (34) extending through the connector and arranged to permit fluid communication between the interior of the inner container (20) and a headspace gas drain (40); anda liquid sensor (38) arranged to sense when liquid (12) begins to flow in the gas passage (34), by detecting presence of liquid (12) in the gas passage (34), to indicate that headspace gas (18) has been exhausted from the inner container (20);wherein the connector is arranged for connection to a pressurized fluid source (30) in fluid communication with a compression space (31) between the inner container (20) and the outer container (22) for forcing the headspace gas (18) out of the inner container (20) via the gas passage (34) to the headspace gas drain (40) and for forcing liquid (12) out of the inner container (20) through the liquid flow passage (42) in the probe to the manufacturing process (13).
- A system according to claim 12, further comprising: a drain valve (36) connected between the headspace gas drain (40) and the gas passage (34), the drain valve (36) having an open position selectable to allow the headspace gas (18) to evacuate to the headspace gas drain (40) via the gas passage (34), and a closed position selectable responsive to detection by the liquid sensor (38) when liquid (12) begins to flow in the gas passage (34) as indicative that the headspace gas (18) has been exhausted from the interior of the inner container (20).
- A system according to claim 12, further comprising: empty detect means for detecting when the liquid (12) has been exhausted from the inner container (20).
- A system according to claim 14, wherein the empty detect means comprises an empty detect gas sensor (62) arranged to sense an empty detect gas introduced to an interior of the inner container (20) immediately prior to dispensing of the liquid (12) to the manufacturing process (13).
- A system according to claim 15, further comprising: a gas quantity controller (56); a first block valve (55) connected between an empty detect gas supply (52) and the gas quantity controller (56), the first block valve (55) having an open position selectable to allow the empty detect gas to flow from the empty detect gas supply (52) into the gas quantity controller (56), and a closed position selectable when a measured quantity of empty detect gas has been introduced into the gas quantity controller (56); and a second block valve (58) connected between the gas quantity controller (56) and an interior of the inner container (20), the second block valve (58) having an open position selectable to allow the empty detect gas to flow from the gas quantity controller (56) to the interior of the inner container (20), and a closed position selectable when the empty detect gas has been exhausted from the gas quantity controller (56).
- A system according to claim 16, further comprising: a pressure regulator gauge (54) connected between the empty detect gas supply (52) and the gas quantity controller (56) to regulate the pressure in the gas quantity controller (56) as the empty detect gas is introduced into the gas quantity controller (56) such that the first block valve (55) is closed when the measured quantity of empty detect gas has been introduced into the gas quantity controller (56) based upon the pressure in the gas quantity controller (56).
- A system according to claim 16, further comprising: a select valve (60) having ports (60a, 60b) connected to at least one of the first and the second block valve (55, 58), the headspace gas drain (40), and the interior of the inner container (20), wherein the select valve (60) allows selectable fluid connection of at least one of the first and the second block valve (55, 58) and the headspace gas drain (40) to the interior of the inner container (20).
- A system according to claim 14, wherein the empty detect means includes a scale (44) for weighing the fluid container (16) while the liquid (12) is dispensed to the manufacturing process (13) such that dispensing of the liquid (12) is terminated when the fluid container (16) reaches a predetermined weight as measured by the scale (44).
Applications Claiming Priority (2)
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US10/823,127 US20050224523A1 (en) | 2004-04-13 | 2004-04-13 | Liquid dispensing method and system with headspace gas removal |
PCT/US2005/012593 WO2005100203A2 (en) | 2004-04-13 | 2005-04-13 | Liquid dispensing method and system with headspace gas removal |
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-
2004
- 2004-04-13 US US10/823,127 patent/US20050224523A1/en not_active Abandoned
-
2005
- 2005-04-11 TW TW094111353A patent/TWI356141B/en active
- 2005-04-11 MY MYPI20051594A patent/MY147252A/en unknown
- 2005-04-13 CN CNA200580011316XA patent/CN101010241A/en active Pending
- 2005-04-13 EP EP05734931A patent/EP1737758B1/en active Active
- 2005-04-13 WO PCT/US2005/012593 patent/WO2005100203A2/en active Application Filing
- 2005-04-13 AT AT05734931T patent/ATE546409T1/en active
- 2005-04-13 JP JP2007508510A patent/JP2007532433A/en active Pending
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2006
- 2006-11-08 KR KR1020067023370A patent/KR101174928B1/en active IP Right Grant
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2011
- 2011-05-19 JP JP2011112901A patent/JP5186583B2/en active Active
Also Published As
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MY147252A (en) | 2012-11-14 |
TW200533858A (en) | 2005-10-16 |
JP5186583B2 (en) | 2013-04-17 |
JP2007532433A (en) | 2007-11-15 |
EP1737758A2 (en) | 2007-01-03 |
JP2011157136A (en) | 2011-08-18 |
KR101174928B1 (en) | 2012-08-17 |
WO2005100203A3 (en) | 2007-03-22 |
CN101010241A (en) | 2007-08-01 |
TWI356141B (en) | 2012-01-11 |
EP1737758A4 (en) | 2010-11-10 |
WO2005100203A2 (en) | 2005-10-27 |
ATE546409T1 (en) | 2012-03-15 |
US20050224523A1 (en) | 2005-10-13 |
KR20060135943A (en) | 2006-12-29 |
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