EP2250023A1 - Printer with gas bubble occlusion resistant conduits - Google Patents
Printer with gas bubble occlusion resistant conduitsInfo
- Publication number
- EP2250023A1 EP2250023A1 EP08714380A EP08714380A EP2250023A1 EP 2250023 A1 EP2250023 A1 EP 2250023A1 EP 08714380 A EP08714380 A EP 08714380A EP 08714380 A EP08714380 A EP 08714380A EP 2250023 A1 EP2250023 A1 EP 2250023A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- conduit
- printhead
- printing fluid
- inkjet printer
- area
- 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.)
- Granted
Links
- 239000012530 fluid Substances 0.000 claims abstract description 29
- 238000010943 off-gassing Methods 0.000 claims description 15
- 241000736305 Marsilea quadrifolia Species 0.000 claims description 4
- 241000219793 Trifolium Species 0.000 claims description 4
- 230000002706 hydrostatic effect Effects 0.000 claims description 3
- 239000011800 void material Substances 0.000 claims description 2
- 230000037452 priming Effects 0.000 description 6
- 229920003266 Leaf® Polymers 0.000 description 4
- 229920000106 Liquid crystal polymer Polymers 0.000 description 4
- 239000004977 Liquid-crystal polymers (LCPs) Substances 0.000 description 4
- 238000011144 upstream manufacturing Methods 0.000 description 4
- 238000000465 moulding Methods 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/17—Ink jet characterised by ink handling
- B41J2/19—Ink jet characterised by ink handling for removing air bubbles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/17—Ink jet characterised by ink handling
- B41J2/175—Ink supply systems ; Circuit parts therefor
Definitions
- the present invention relates to inkjet printers and in particular, the fluidic system for supplying the printhead with ink.
- Pagewidth printheads increase print speeds as the printhead does not traverse back and forth across the page to deposit a line of an image.
- the pagewidth printhead simply deposits the ink on the media as it moves past at high speeds.
- Such printheads have made it possible to perform full colour 1600dpi printing at speeds in the vicinity of 60 pages per minute; speeds previously unattainable with conventional inkjet printers.
- the ink conduits can be blocked by air bubbles. Air bubbles can form in the ink conduits when dissolved gasses come out of solution during periods of inactivity. If the bubble is big enough, it can completely occlude the conduit and block the ink flow. The bubble can pin to the inside of the conduit such that it requires a finite force to be applied to move it, as if it had a static coefficient of friction. The bubble resists moving with the ink flow and can starve areas downstream of the bubble, or cause a detrimental pressure increase upstream of the bubble.
- the present invention provides an inkjet printer comprising: a printhead with an array of nozzles for ejecting printing fluid;
- SBFOl 1 -PCT a conduit connected to the printhead, the conduit defining a flow path for the printing fluid; wherein, the conduit has an internal cross section configured such that the surface tension of the printing fluid favors gas bubble growth along the conduit length over radial bubble growth that fully occludes the flow path.
- the invention is predicated on the realization that the inherent tendency for surface tension to adopt the lowest energy configuration can be used make gas bubbles grow longitudinally in the ink line instead of radially. By preventing the bubble from growing across the entire flow path, it may constrict the flow but not form a blockage. Ink can still flow through the line without first having to overcome the resistance of a bubble surface tension pinned to the internal surface. Importantly, this allows the pressure on either side of the bubble to equalize during printer standby periods. A pressure build up in the printhead because of diurnal temperature changes can flood the nozzles.
- the internal cross section has a first area and the second area adjoining the first area, the first area being defined as an area that will allow radial growth of the gas bubble until it is completely occluded, and second area being defined as an area that will resist radial intrusion of a gas bubble that completely occludes the first area.
- the second area is shaped such that any gas bubble capable of expanding radially from the first area into the second area until the second area is void of printing fluid, would require an internal gas pressure greater than the internal gas pressure of gas bubbles formed in the printing fluid by outgassing.
- the internal cross section is star-shaped.
- the internal cross section is triangular.
- the internal cross section is T'-shaped.
- the internal cross section is cross-shaped.
- the internal cross section is 'three leaf clover' -shaped. In another preferred form, the internal cross section is "four leaf clover"-shaped.
- the present invention provides an inkjet printer comprising: a printhead with an array of nozzles for ejecting printing fluid; a conduit connected to the printhead, the conduit defining a flow path for the printing fluid; wherein,
- the conduit has an internal cross section configured such that its dimension in a first direction far exceeds its dimension in the second direction normal to the first direction such that the gas bubble growing within the conduit will break into smaller separate gas bubbles before the fluid includes the flow path because of Plateau-Rayleigh instability.
- This aspect of the invention recognises that the phenomenon known as Plateau- Rayleigh instability (named after Joseph Plateau and Lord Rayleigh who investigated the phenomenon in 1873) can be used to ensure that a single gas bubble is not completely occlude the flow path defined by a conduit.
- Plateau- Rayleigh instability named after Joseph Plateau and Lord Rayleigh who investigated the phenomenon in 1873
- the cross section of the conduit is an elongate rectangle.
- the cross section of the printhead can have several intersecting, elongate rectangle sections.
- the cross section of the conduit is annular such that the radial width of the conduit is far less than the circumference.
- the printing fluid reservoir is a sump positioned at a lower elevation than the printhead, the sump having a headspace of air above the printing fluid, and an inlet located in the headspace, the conduit being connected to the inlet such that during printer standby periods, the printing fluid in the conduit hanging from the printhead creates negative hydrostatic pressure in the printhead.
- a conduit according to the present invention prevents any outgassing bubbles from completely occluding the ink flow path. As the outgassing bubbles do not form a flow obstruction, there is no build up pressure on the upstream side of bubble. Any expansion of the air in the air pockets pumps ink into the sump instead of causing a nozzle flood.
- the hanging column of ink maintains the correct negative pressure at the nozzles.
- Figure 1 is a schematic diagram of a printer fluidic system
- Figures 2A and 2B are schematic transverse and longitudinal cross sections of a conduit during bubble nucleation
- Figures 3A and 3B are schematic transverse and longitudinal cross sections of the conduit showing maximum radial bubble growth
- SBFOl 1 -PCT Figure 4 is a sketch of a star-shaped cross section conduit
- Figure 5 is a sketch of a triangular cross section conduit
- Figure 6 is a sketch of a T-shaped cross section conduit
- Figure 7 is a sketch of a 'three leaf clover' cross section conduit
- Figure 8 is a sketch of a 'four leaf clover' cross section conduit
- Figures 9A to 9C are sketches of bubble growth within a conduit according to a second aspect of the invention.
- Figure 10 is another embodiment of a conduit according to a second aspect of the present invention.
- FIG 1 is a schematic view of a prior art fluidic system of the type used in the above referenced USSN ... (our docket RREOOlUS). The operation of the system and its individual components are described in detail in USSN ... (our docket SBF009US) the contents of which are incorporated herein by reference.
- the printer fluidic system has a printhead assembly 2 supplied with ink from an ink tank 4 via an upstream ink line 8 and waste ink is drained to a sump 18 via a downstream ink line 16.
- the downstream ink line 16 has a shut off valve 14 which allows the fluidic system to purge the nozzles to correct colour mixing or recover clogged nozzles.
- a single ink line is shown for simplicity. In reality, the printhead has multiple ink lines for full colour printing.
- the upstream ink line 8 has a shut off valve 10 for selectively isolating the printhead assembly 2 from the pump 12 and or the ink tank 4.
- the pump 12 is used to actively prime or flood the printhead assembly 2.
- the pump 12 is also used to establish a negative pressure in the ink tank 4. During printing, the negative pressure is maintained by the bubble point regulator 6.
- the printhead assembly 2 is an LCP (liquid crystal polymer) molding 20 supporting a series of printhead ICs 30 secured with an adhesive die attach film (not shown).
- the printhead ICs 30 have an array of ink ejection nozzles for ejecting drops of ink onto the passing media
- the SBFOl 1 -PCT substrate 22 SBFOl 1 -PCT substrate 22.
- the nozzles are MEMS (micro electro-mechanical) structures printing at true
- the LCP molding 20 has a main channel 24 extending between the inlet 36 and the outlet 38.
- the main channel 24 feeds a series of fine channels 28 extending to the underside of the LCP molding 20.
- the fine channels 28 supply ink to the printhead ICs 30 through laser ablated holes in the die attach film.
- main channel 24 Above the main channel 24 is a series of non-priming air cavities 26. These cavities
- the printers are designed to trap a pocket of air during printhead priming.
- the air pockets give the system some compliance to absorb and damp pressure spikes or hydraulic shocks in the ink.
- the printers are high speed pagewidth printers with a large number of nozzles firing rapidly. This consumes ink at a fast rate and suddenly ending a print job, or even just the end of a page, means that a column of ink moving towards (and through) the printhead assembly 2 must be brought to rest almost instantaneously. Without the compliance provided by the air cavities 26, the momentum of the ink would flood the nozzles in the printhead ICs 30. Furthermore, the subsequent 'reflected wave' can generate a negative pressure strong enough to deprime the nozzles.
- FIGS 2 A and 2B are sketches of the transverse and longitudinal cross sections of the conduit 16.
- the cross section of the conduit 16 has two areas-the first area 42 and a second area 44. Both the first and second areas 42 and 44 defining a flow path for the ink 50.
- Outgassing bubble 40 nucleates on the side of the first area 42 and expands radially and longitudinally.
- the outgassing bubble 40 has grown to completely occlude the first area 42. However the second area 44 remains filled with ink 50.
- the shape of the outgassing bubble 40 is defined by the radius Rmbe of the first area 42 and the maximum possible radius R max at the unconstrained face 46 of the bubble 40.
- the unconstrained face 46 of the bubble 40 will naturally tend towards the lowest energy state. Accordingly the radius of curvature R max of the unconstrained face 46 will be the maximum that the gas pressure within the bubble 40 will allow (which corresponds to the minimum surface area that the bubble face 46 can have at the gas pressure). With increasing gas pressure, the radius of the bubble face 46 reduces, and the surface area of the bubble face 46 increases.
- the gas pressure within the bubble 40 would need to be enough to form a semicircular bubble surface 48 having a critical radius of curvature Rent- Knowing the internal gas pressure of outgassing bubbles 40, the first area 42 and the second area 44 can adjoin each other such a way that R max of any bubble surface 46 formed during the expected range of ambient conditions is greater than R crit . This will prevent any bubble 40 nucleating is the first area 42 from continuing to grow radially into the second area 44. Instead further bubble roof will be in the longitudinal direction of the first area 42 (see Figure 3B). In this way the ink 50 always has a flow path around the bubble 40.
- the second area 44 can also the configured such that an outgassing bubble 40 nucleating on its inner wall will never grow large enough to occlude the first area 42. Furthermore, once the printer has come out of standby mode as
- Figures 4 to 8 are sketches of possible cross sections of the conduit 16.
- Figure 4 shows a star-shaped cross section with a central for defining the first area 42 while the points of the star provide a plurality of second areas 44.
- An outgassing bubble 40 in the first area 42 will not continue to grow radially into the points 44. Instead, further bubble growth will be longitudinal.
- bubble growth may extend further into that point than any of the others. However, the remainder of the points will provide a flow path for the ink 50.
- the triangular cross section shown in Figure 5 will contain any outgassing bubbles 40 in a central area 42 while vertices 44 of the triangle remains filled with ink 50.
- the cross section is T-shaped. Bubble 40 growth and occlusion in one section 42 of the 'T' will not extend into the other section 44 of the 'T'.
- Figures 7 and 8 show cross sections having a three leaf and four leaf clover shape respectively. These cross sections are particularly useful when applied to extruded, flexible tubing. Not only do the leafs 44 have a relatively large surface area to provide little resistance to any flow of ink 50 when central bore 42 is occluded by a bubble 40, but the clover shape is resistant to kinking in a way that blocks all fluid flow.
- Figures 9A, 9B and 9C show the cross sections of conduit 16 according to the second aspect of the invention. These cross sections extend into one dimension X for more than the transverse dimension Y. If an outgassing bubble 40 nucleates in conduit 16 it will grow as a single bubble 40 in the X direction. However before the bubble 40 can extend completely across the conduit 16, a phenomenon known as the Plateau Rayleigh instability will cause the bubble 40 to break up into separate bubbles 52, 54 and 56 (the Figure 9C). This will ensure that the cross sections is never completely occluded and the ink 50 has flow path between an around the individual bubbles.
- Figure 10 shows the cross section of an annular conduit 16.
- the circumference X of the annulus is far greater than the width Y of the annual flow path.
Landscapes
- Ink Jet (AREA)
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/AU2008/000332 WO2009111814A1 (en) | 2008-03-12 | 2008-03-12 | Printer with gas bubble occlusion resistant conduits |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2250023A1 true EP2250023A1 (en) | 2010-11-17 |
EP2250023A4 EP2250023A4 (en) | 2011-03-02 |
EP2250023B1 EP2250023B1 (en) | 2012-10-31 |
Family
ID=41064653
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08714380A Active EP2250023B1 (en) | 2008-03-12 | 2008-03-12 | Printer with gas bubble occlusion resistant conduits |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2250023B1 (en) |
KR (1) | KR20100119785A (en) |
TW (1) | TW200938378A (en) |
WO (1) | WO2009111814A1 (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1386743A1 (en) * | 2001-05-09 | 2004-02-04 | Matsushita Electric Industrial Co., Ltd. | Ink jet device, ink jet ink, and method of manufacturing electronic component using the device and the ink |
EP1577096A1 (en) * | 2004-03-19 | 2005-09-21 | Brother Kogyo Kabushiki Kaisha | Inkjet printer |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5812165A (en) * | 1991-08-29 | 1998-09-22 | Hewlett-Packard Company | Leak resistant ink-jet pen |
WO1999001285A1 (en) * | 1997-07-02 | 1999-01-14 | Seiko Epson Corporation | Ink jet recorder |
DE10239659B4 (en) * | 2002-08-26 | 2005-12-15 | Artech Gmbh Design + Production In Plastic | Ink supply means |
-
2008
- 2008-03-12 WO PCT/AU2008/000332 patent/WO2009111814A1/en active Application Filing
- 2008-03-12 EP EP08714380A patent/EP2250023B1/en active Active
- 2008-03-12 KR KR1020107019657A patent/KR20100119785A/en not_active Application Discontinuation
- 2008-04-03 TW TW097112331A patent/TW200938378A/en unknown
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1386743A1 (en) * | 2001-05-09 | 2004-02-04 | Matsushita Electric Industrial Co., Ltd. | Ink jet device, ink jet ink, and method of manufacturing electronic component using the device and the ink |
EP1577096A1 (en) * | 2004-03-19 | 2005-09-21 | Brother Kogyo Kabushiki Kaisha | Inkjet printer |
Non-Patent Citations (1)
Title |
---|
See also references of WO2009111814A1 * |
Also Published As
Publication number | Publication date |
---|---|
TW200938378A (en) | 2009-09-16 |
KR20100119785A (en) | 2010-11-10 |
EP2250023B1 (en) | 2012-10-31 |
EP2250023A4 (en) | 2011-03-02 |
WO2009111814A1 (en) | 2009-09-17 |
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