CN110239221B - Ink-jet printing device - Google Patents

Ink-jet printing device Download PDF

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Publication number
CN110239221B
CN110239221B CN201810195910.8A CN201810195910A CN110239221B CN 110239221 B CN110239221 B CN 110239221B CN 201810195910 A CN201810195910 A CN 201810195910A CN 110239221 B CN110239221 B CN 110239221B
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China
Prior art keywords
ink
cavity
chamber
pressure
filter
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Active
Application number
CN201810195910.8A
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Chinese (zh)
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CN110239221A (en
Inventor
谢永林
张小飞
李鹏
吕慧强
闫昱含
钱波
李令英
周岩
林光慧
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Shanghai Riefa Digital Technology Co., Ltd.
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Shanghai Riefa Digital Technology Co ltd
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Priority to CN201810195910.8A priority Critical patent/CN110239221B/en
Publication of CN110239221A publication Critical patent/CN110239221A/en
Application granted granted Critical
Publication of CN110239221B publication Critical patent/CN110239221B/en
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, e.g. INK-JET PRINTERS, THERMAL PRINTERS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005Typewriters 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
    • B41J2/01Ink jet
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, e.g. INK-JET PRINTERS, THERMAL PRINTERS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005Typewriters 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
    • B41J2/01Ink jet
    • B41J2/17Ink jet characterised by ink handling
    • B41J2/175Ink supply systems ; Circuit parts therefor
    • B41J2/17563Ink filters

Abstract

The invention discloses an inkjet printing apparatus, including: the ink cavity is used for containing injected ink; the pressure cavity is communicated with the ink cavity and is used for ejecting the ink flowing in through the ink cavity; and the filtering structure is arranged between the ink cavity and the pressure cavity and is used for filtering the ink flowing into the pressure cavity from the ink cavity. The ink-jet printing device can effectively filter pollutants in ink, particularly the pollutants which cannot be filtered by a filtering system and are generated in the manufacturing process or the packaging process of the spray head, and meanwhile, the material of the filtering structure is the same as that of the base material forming the ink cavity and the pressure cavity, so that the problems of bubbling, falling and the like of the filtering structure can be avoided.

Description

Ink-jet printing device
Technical Field
The invention relates to the technical field of printing equipment, in particular to an ink-jet printing device.
Background
The printhead in a piezoelectric inkjet printing device is generally composed of piezoelectric material, ink chambers, orifices, ink inlets, and electrodes. The volume of the ink cavity is changed by the bending deformation of the piezoelectric material, and then pressure waves are generated and transmitted to the nozzle to generate ink drops, so that the ink drops are ejected to a printing substrate to form a certain image.
In an ink jet printing process, ink first enters an ink chamber in a printing head from an ink supply system and then enters an orifice from the ink chamber. The ink usually contains certain impurities and bubbles inevitably, and the impurities often block the parts because the ink flow passages and the jet orifices in the ink-jet printing head are small in size, so that the ink-jet printing head is in ink failure; and the bubbles are mixed in the ink and enter the ink flow channel, which can cause unstable ink jet and other fields. In response to this problem, it is common to add a filtering system between the ink supply system and the ink chamber, so as to filter out some impurities and bubbles from the ink.
However, contaminants may also enter the printhead during the printhead fabrication process, especially during packaging at ultra-clean environmental levels that are low compared to the printhead fabrication process, and these contaminants may enter the flow channels or orifices inside the printhead with the ink during the ink jetting process, affecting the quality of the ink-jet printed image. These contaminants cannot be filtered by adding a filter system between the ink supply system and the ink chamber.
Disclosure of Invention
To solve the above problems of the prior art, the present invention provides an inkjet printing apparatus for filtering contaminants in ink, particularly contaminants generated during a manufacturing process or an encapsulation process of a head, which cannot be filtered by a filtering system.
In order to achieve the purpose of the invention, the invention adopts the following technical scheme:
the present invention provides an inkjet printing apparatus, including:
the ink cavity is used for containing injected ink;
the pressure cavity is communicated with the ink cavity and is used for ejecting the ink flowing in through the ink cavity;
and the filtering structure is arranged between the ink cavity and the pressure cavity and is used for filtering the ink flowing into the pressure cavity from the ink cavity. This design is direct to locate printing device's printer head with filtration, and the outside injects the ink to the ink chamber, and the ink in the ink chamber flows to the pressure chamber after filtration of filtration through filtration, not only can filter the impurity that filtration system did not filter, can filter the pollutant that produces in the shower nozzle manufacture process and the encapsulation process simultaneously in the lump to accomplish the filtration to the ink before the ink gets into the orifice, be unlikely to arouse the orifice to block up, influence the quality of inkjet printing image.
Further, the filtering structure comprises a plurality of filtering columns, and the interval between two adjacent filtering columns is 5-200 μm.
Furthermore, the plurality of filter columns are respectively arranged in an array along the flow direction of the ink and in a direction perpendicular to the flow direction of the ink to form a plurality of columns of filter columns perpendicular to the flow direction of the ink.
Further, the spacing between each row of filter columns is 10-200 μm, preferably 100 μm.
Furthermore, the spacing between the filter columns in each row of filter columns is 5-50 μm.
Further, the cross-sectional shape of the plurality of filter columns includes at least one of a circle, a triangle, and a quadrilateral.
Further, the ink chamber includes a confluence chamber and a plurality of branch chambers communicated with the confluence chamber, and the plurality of branch chambers are arranged along a direction perpendicular to a flow direction of the ink, wherein the branch chambers include a first inlet and a first outlet, and the first inlet and the first outlet have the same aperture.
Furthermore, the pressure chamber is provided with a plurality of pressure chambers, the plurality of pressure chambers are arranged along the direction of the flow direction of the ink, the pressure chamber sequentially comprises a first sub pressure chamber, a second sub pressure chamber and a third sub pressure chamber along the direction far away from the first outflow port, the first sub pressure chamber comprises a second inflow port and a second outflow port, the calibers of the second inflow port and the second outflow port are equal, the second sub pressure chamber comprises a third inflow port and a third outflow port, the calibers of the third inflow port and the third outflow port are equal, the third inflow port is larger than that of the third inflow port, the third inflow port is connected with the second outflow port, the third sub pressure chamber comprises a fourth inflow port, the calibers of the third inflow port and the fourth inflow port are equal and connected with the third outflow port, an ink jet channel is arranged at the bottom of the third sub pressure chamber, and the calibers of the second inflow port is smaller than that of the first outflow port.
Further, the ink chamber, the pressure chamber, and the filter structure are integrally formed.
Furthermore, the ink jet printing device also comprises a piezoelectric driving cover plate, the piezoelectric driving cover plate is covered on the ink cavity, the pressure cavity and the filtering structure, and the piezoelectric driving cover plate is provided with an ink injection port communicated with the ink cavity.
Compared with the prior art, the filtering structure in the ink-jet printing device can effectively filter pollutants in ink, particularly the pollutants which cannot be filtered by a filtering system and are generated in the manufacturing process or the packaging process of the spray head, and meanwhile, the material of the filtering structure is the same as that of the base material forming the ink cavity and the pressure cavity, so that the problems of bubbling, falling and the like of the filtering structure can be avoided.
Drawings
The above and other aspects, features and advantages of embodiments of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic top view of an inkjet printing apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of an inkjet printing apparatus according to an embodiment of the present invention;
FIG. 3 is a schematic side view of an inkjet printing apparatus according to an embodiment of the invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the specific embodiments set forth herein. Rather, these embodiments are provided to explain the principles of the invention and its practical application to thereby enable others skilled in the art to understand the invention for various embodiments and with various modifications as are suited to the particular use contemplated. In the drawings, the shapes and sizes of elements may be exaggerated for clarity, and the same reference numerals will be used throughout to designate the same or similar elements.
Referring to fig. 1-3, an inkjet printing apparatus according to the present invention includes an ink chamber 12, a filter structure 13, a pressure chamber 11, and a piezoelectric driving cover plate 2. The ink chamber 12 is communicated with the pressure chamber 11, so that ink in the ink chamber 12 can flow into the pressure chamber 11, the filtering structure 13 is disposed between the ink chamber 12 and the pressure chamber 11, and the filtering structure 13 filters the ink flowing into the pressure chamber 11 from the ink chamber 12, it can be understood that the chamber bottom of the pressure chamber 11, which is far away from the ink chamber 12, is provided with an ink jet channel 14, so that the ink in the pressure chamber 11 can be jetted out through the ink jet channel 14, the piezoelectric driving cover plate 2 is covered on the ink chamber 12, the filtering structure 13, and the pressure chamber 11, so that an ink accommodating space is formed between the piezoelectric driving cover plate 2 and the ink chamber 12, the filtering structure 13, and the pressure chamber 11, wherein the piezoelectric driving cover plate 2 is provided with an ink injection port 21 communicated with the ink chamber 12, and the specific structure and driving manner of the piezoelectric driving cover plate 2 can refer to.
Referring to fig. 1 and 2, the filter structure 13 in this embodiment is a plurality of filter columns, and in order to ensure that the ink in the ink chamber 12 enters the pressure chamber 11 smoothly and filter the contaminants entering the ink as much as possible, preferably, the interval between two adjacent filter columns is 5 μm to 200 μm, and further 5 μm to 50 μm, and further, the cross-sectional shape of the filter columns may be circular, triangular or quadrilateral, and if a plurality of filter columns are provided, the cross-sectional shape of the plurality of filter columns includes at least one of circular, triangular and quadrilateral. The number and arrangement of the filter columns between the ink chamber 12 and the pressure chamber 11 are not particularly limited, and the filter columns may be arranged by comprehensively considering the circulation of ink and the filtration of contaminants according to actual conditions. Preferably, the filter columns between the ink chamber 12 and the pressure chamber 11 are arranged in a sparse and dense manner along the flowing direction of the ink, that is, the distance between the filter columns is sequentially reduced along the flowing direction of the ink, so that multi-layer filtering can be realized, the ink entering from the ink chamber 12 is firstly subjected to coarse filtering, that is, pollutants with larger diameter are filtered, then the pollutants with smaller diameter are filtered along with the reduction of the distance between the filter columns, layer by layer until the ink entering the pressure chamber 11 is almost free of pollutants, thus the ink can rapidly flow through due to the larger distance between the filter columns near the ink chamber 12, and the blockage at the initial position of the filter columns is avoided, moreover, because the pollutants are accumulated between the filter columns when the printing device is used for a longer time, the distance between the filter columns is reduced, if the distance between the filter columns is directly arranged to be narrower at the side near the ink chamber 12, the filter columns are easy to block and are too wide, and pollutants with narrow diameters cannot be filtered, so that the filter columns in the embodiment can be arranged in a sparse and dense mode, so that the blocking time caused by the filter columns can be prolonged, and the service life of the printing device is prolonged.
Referring to fig. 1, 2 and 3, since the size and number of the orifices in the printing device greatly affect the printing quality and speed, in order to improve the printing efficiency and printing quality, the present embodiment uses multiple orifices for printing, and in combination with fig. 1 and 2, the pressure chambers 11 of the present embodiment are provided in plural numbers, the pressure chambers 11 are arranged in the direction perpendicular to the flow direction of the ink (and the longitudinal direction in fig. 1), the bottom of the pressure chambers 11 are respectively provided with ink ejection channels 14, the ink ejection channels 14 are respectively connected with the orifices 31, and the smaller and the larger the number of the orifices, the finer printing can be realized, and the printing quality is improved.
Referring to fig. 1, in order to further avoid the occurrence of blockage at the inlet of the pressure chamber 11 when the ink enters the pressure chamber 11 and the influence on the printing stability caused by too fast ink flow rate entering the pressure chamber 11, the resistance of ink flow needs to be changed, and the flow rate of the ink entering the pressure chamber is controlled. Specifically, the pressure chamber 11 includes a first sub-pressure chamber 111, a second sub-pressure chamber 112 and a third sub-pressure chamber 113 which are sequentially connected in a through manner, preferably, the first sub-pressure chamber 111 includes a second inlet port (with a caliber size of a) and a second outlet port (with a caliber size of a), the calibers of which are equal to each other, the second sub-pressure chamber 112 includes a third inlet port (with a caliber size of a) and a third outlet port (with a caliber size of B), the calibers of which are equal to each other, the second outlet port (with a caliber size of a), the third inlet port (with a caliber size of a), the third outlet port (with a caliber size of a), the third sub-pressure chamber 113 includes a fourth inlet port (with a caliber size of B), the calibers of which are equal to each other, the third outlet port (with a caliber size of B), and the fourth inlet port (with a caliber size of B), the structure can effectively control the flow rate of the filtered ink entering the pressure chamber 11, not only ensures that enough ink is supplied in the pressure cavity 11 and the printing is stable, and the printed image quality is high, but also prevents the inlet of the pressure cavity 11 from being blocked due to the gentle arrangement of the first sub-pressure cavity 111, so that the ink can smoothly circulate. It can be understood that the ink-jet channel 14 is disposed at the bottom of the third sub-pressure cavity 113 and is communicated with the third sub-pressure cavity 113, so as to ensure smooth circulation of ink in the pressure cavity 11.
Specifically, in order to make the ink in the ink chamber 12 enter the pressure chamber smoothly in time, referring to fig. 1 and 2, the ink chamber 12 in this embodiment includes a confluence chamber 122 and a plurality of branch chambers 121 communicating with the confluence chamber 122, the plurality of branch chambers 121 are arranged in a direction perpendicular to the flow direction of the ink (i.e. the longitudinal direction in fig. 1), wherein the branch chambers 121 include a first inlet and a first outlet, the first inlet and the first outlet have the same caliber, the confluence chamber 122 is located on one side of the first inlet of the plurality of branch chambers 121, and the plurality of branch chambers 121 are all communicated with the confluence chamber 122, this structure ensures that the ink in the confluence chamber 122 can be uniformly supplied to the plurality of branch chambers 121 in time, so that the printing is more stable and the quality of the printed image is ensured, preferably, a collection chamber 122-1 communicating with the confluence chamber 122 is provided at the end of the confluence chamber 122 in the length direction, this collection chamber 122-1 is used for collecting the outside ink that injects through annotating the ink jet 23 on the piezoelectricity drive apron 2, and the ink that collects flows into converging chamber 122 and flows into reposition of redundant personnel chamber 121 respectively, and the setting of reposition of redundant personnel chamber 121 has improved the mobility of ink to a certain extent owing to reduced the vertical interval that the ink flows, and owing to a plurality of reposition of redundant personnel chambers 121 that the interval set up, has guaranteed the even circulation of ink.
With respect to the above-mentioned multiple arrangements of the pressure chambers 11 and the shunting chambers 121, it is preferable, as shown in fig. 1, that the number of the pressure chambers 11 is equal to the number of the shunting chambers 121, and further that the pressure chambers 11 are arranged opposite to the shunting chambers 121, that is, the outlets of the shunting chambers 121 are opposite to the inlets of the pressure chambers 11, so as to further ensure the smooth circulation of the ink and reduce the blockage caused by the staggered circulation of the ink. Because the ink in the shunting cavity 121 is unfiltered and the ink entering the pressure cavity 11 is filtered, preferably, the caliber C of the first outlet of the shunting cavity 121 is larger than the caliber a of the second inlet of the first sub-pressure cavity 111, so that the ink filled in the shunting cavity 121 can just fill the inlet of the pressure cavity 11 with a smaller caliber after being filtered, and the flow rate of the ink is ensured; if the aperture C of the first outlet port of the distribution chamber 121 is equal to or smaller than the aperture a of the second inlet port of the first sub-pressure chamber 111, the second inlet port cannot be filled by the second inlet port, which results in a waste of the space in the pressure chamber 11 and affects the flow rate of the ink.
Further, for the above-mentioned one-to-one arrangement of the pressure chambers 11 and the shunting chambers 121, the plurality of filter columns between the plurality of pressure chambers 11 and the plurality of shunting chambers 121 are arranged in an array, specifically, the plurality of filter columns are respectively arranged in an array along the flow direction of the ink (i.e. the transverse direction in fig. 1) and perpendicular to the flow direction of the ink (i.e. the longitudinal direction in fig. 1), to form a plurality of rows of filter columns parallel to the flow direction of the ink (i.e. the longitudinal direction in fig. 1), the distance between each row of filter columns is 10 μm to 200 μm, as shown in fig. 1, in this embodiment, four rows of filter columns are provided, the distance between each row of filter columns is 100 μm, the distance between the filter columns in each row of filter columns is 5 μm to 50 μm, the height of the silicon columns is 10 μm to 100 μm, the filter columns of this specification can ensure the circulation of the ink and filter more and smaller contaminants, and the space can be saved, the size of a printing head in the printing device can be reduced, and the cost can be reduced.
Because make among the prior art often carry out range upon range of connection between filter screen and the shower nozzle structural layer and filter, nevertheless because the material of filter screen is inconsistent with shower nozzle structural material, there is the risk in joint strength between filter screen and the shower nozzle structural layer, if the adhesion is not good to cause the tympanic bulla, the coefficient of thermal expansion is inconsistent to cause and drops etc.. Therefore, preferably, the ink chamber 12, the filter structure 13, and the pressure chamber 11 in the inkjet printing apparatus according to the embodiment of the present invention are integrally formed, so that the filter column structure 13 and the base material forming the ink chamber 12 and the pressure chamber 11 are the same, and the problems of bubbling and dropping do not occur. Preferably, the integral molding can be realized by a deep silicon etching process.
The filtering structure in the ink-jet printing device can effectively filter pollutants in ink, particularly the pollutants which cannot be filtered by a filtering system and are generated in the manufacturing process or the packaging process of the spray head, and meanwhile, the filtering structure is made of the same material as the base material forming the ink cavity and the pressure cavity, so that the problems of bubbling, falling and the like of the filtering structure can be avoided.
While the invention has been shown and described with reference to certain embodiments, those skilled in the art will understand that: various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.

Claims (8)

1. An inkjet printing apparatus, comprising:
the ink cavity is used for containing injected ink; the ink chamber comprises a confluence chamber and a plurality of branch chambers communicated with the confluence chamber, and the branch chambers are arranged along the direction perpendicular to the flow direction of ink, wherein each branch chamber comprises a first inlet and a first outlet, and the calibers of the first inlet and the first outlet are equal;
the pressure cavity is communicated with the ink cavity and is used for ejecting the ink flowing in through the ink cavity; the ink dispenser comprises a plurality of pressure cavities, a plurality of ink distributing cavities and a plurality of ink distributing channels, wherein the plurality of pressure cavities are arranged along the direction perpendicular to the flow direction of ink, and the plurality of pressure cavities and the plurality of distributing cavities are arranged in a one-to-one opposite mode; the pressure cavity sequentially comprises a first sub-pressure cavity, a second sub-pressure cavity and a third sub-pressure cavity along the direction far away from the first outflow port, the first sub-pressure cavity comprises a second inflow port and a second outflow port with equal calibers, the second sub-pressure cavity comprises a third inflow port with the calibers equal to those of the second outflow port and a third outflow port with the calibers larger than those of the third inflow port, the third inflow port is connected with the second outflow port, the third sub-pressure cavity comprises a fourth inflow port with the calibers equal to those of the third outflow port and connected with the third outflow port, the calibers of the second inflow port is smaller than that of the first outflow port, and the calibers of the first outflow port of the distribution cavity is larger than those of the second inflow port of the first sub-pressure cavity;
the filtering structure is arranged between the ink cavity and the pressure cavity, the filtering structure is a plurality of filtering columns, the filtering columns between the ink cavity and the pressure cavity are arranged in a sparse and dense mode along the flowing direction of ink, and the filtering structure is used for filtering the ink flowing into the ink cavity from the pressure cavity.
2. The inkjet printing apparatus according to claim 1, wherein an interval between adjacent two of the plurality of filter pillars is 5 μm to 200 μm.
3. The inkjet printing apparatus of claim 2, wherein the plurality of filter pillars are arranged in an array along and perpendicular to a direction of flow of the ink, respectively, to form a plurality of rows of filter pillars perpendicular to the direction of flow of the ink.
4. Inkjet printing apparatus according to claim 3 wherein the spacing between each column of filter pillars is 100 μm.
5. Inkjet printing apparatus according to claim 3 or 4 wherein the spacing between filter columns in each column of filter columns is from 5 μm to 50 μm.
6. The inkjet printing apparatus of claim 2, wherein a cross-sectional shape of the plurality of filter pillars comprises at least one of a circle, a triangle, and a quadrilateral.
7. Inkjet printing apparatus according to claim 1 wherein the ink chamber, the pressure chamber and the filter structure are integrally formed.
8. Inkjet printing apparatus according to claim 1 further comprising a piezoelectric drive cover plate overlying the ink chamber, the pressure chamber and the filter structure, the piezoelectric drive cover plate having an ink fill port in communication with the ink chamber.
CN201810195910.8A 2018-03-09 2018-03-09 Ink-jet printing device Active CN110239221B (en)

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