WO2016104155A1 - 中空糸脱気モジュール及びインクジェットプリンタ - Google Patents
中空糸脱気モジュール及びインクジェットプリンタ Download PDFInfo
- Publication number
- WO2016104155A1 WO2016104155A1 PCT/JP2015/084572 JP2015084572W WO2016104155A1 WO 2016104155 A1 WO2016104155 A1 WO 2016104155A1 JP 2015084572 W JP2015084572 W JP 2015084572W WO 2016104155 A1 WO2016104155 A1 WO 2016104155A1
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- WO
- WIPO (PCT)
- Prior art keywords
- hollow fiber
- ink
- fiber membrane
- hollow
- membrane bundle
- Prior art date
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Images
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- B41J2/17596—Ink pumps, ink valves
Definitions
- the present invention relates to a hollow fiber degassing module for degassing a liquid and an ink jet printer provided with the hollow fiber degassing module.
- An ink jet printer is a printing machine that uses a method of spraying fine droplets of ink directly onto a print medium.
- an ink jet printer there is a possibility that the dissolved gas in the ink is gasified due to the pressure fluctuation inside the ink reservoir during printing and nozzle clogging occurs.
- the risk of significantly reducing print quality This is noticeable during long-term use and high-speed operation.
- it is effective to perform deaeration to remove dissolved gas and bubbles from the ink.
- Patent Document 1 discloses that a hollow fiber deaeration module using a hollow fiber membrane is attached to an ink flow path from an ink reservoir to an inkjet head, and the ink is continuously deaerated. Is disclosed.
- the hollow fiber deaeration module described in Patent Document 1 is an external perfusion type hollow fiber deaeration module, and a hollow fiber membrane bundle in which a plurality of hollow fiber membranes are bundled is housed in a cylinder. Then, ink is supplied to the outside of the hollow fiber membrane and the inside of the hollow fiber membrane is decompressed to degas the ink, and the degassed ink is discharged from the discharge port formed on the side wall of the cylindrical body.
- Patent Document 2 proposes a method of manufacturing a hollow fiber deaeration module that does not include an ink distribution pipe in order to reduce ink pressure loss.
- an object of one aspect of the present invention is to provide a hollow fiber deaeration module and an ink jet printer that can suppress a rapid increase in pressure loss.
- the present inventors examined the cause of the rapid increase in pressure loss of the hollow fiber deaeration module.
- the hollow fiber membrane swells with ink, thereby narrowing or closing the ink flow path, thereby rapidly increasing the pressure loss of the hollow fiber degassing module.
- the findings Specifically, since both ends of the hollow fiber membrane bundle are fixed to the cylinder, when the hollow fiber membrane swells, the hollow fiber membrane is twisted and flattened. And the hollow part used as the flow path of an ink is formed in the radial inside of the hollow fiber membrane bundle.
- the swollen hollow fiber membrane enters the hollow portion, thereby narrowing or closing the hollow portion.
- the gap between the hollow fiber membranes also serves as an ink flow path, but the swollen hollow fiber membrane also narrows or closes the gap between the hollow fiber membranes.
- the hollow fiber deaeration module includes a hollow fiber membrane bundle in which a plurality of hollow fiber membranes are bundled in a cylindrical shape, and a cylindrical body that accommodates the hollow fiber membrane bundle and extends in the axial direction.
- a hollow fiber degassing module that degass the liquid by supplying liquid from the hollow portion of the hollow fiber membrane bundle to the gap between the hollow fiber membranes and depressurizing the inside of the hollow fiber membrane,
- a support is provided in contact with the inner peripheral surface of the yarn membrane bundle.
- the hollow fiber deaeration module according to one aspect of the present invention is an external perfusion type that supplies liquid to the outside of the hollow fiber membrane and degass the liquid by decompressing the inside of the hollow fiber membrane. For this reason, the pressure loss of the liquid can be kept low. And since this hollow fiber deaeration module is provided with the support body contact
- the swollen hollow fiber membrane can be prevented from entering the hollow portion of the hollow fiber membrane bundle serving as a liquid flow path and narrowing or closing the hollow portion. Moreover, it can suppress that the swollen hollow fiber membrane narrows or closes the gap between the hollow fiber membranes. In this way, even if the hollow fiber membrane swells, it is possible to suppress the liquid flow path from being narrowed or blocked, so that the pressure loss of the hollow fiber degassing module is prevented from rapidly increasing. be able to.
- the support may be cylindrical.
- the support may be a net.
- the support may be disposed between one end surface and the other end surface of the hollow fiber membrane bundle in the central axis direction of the hollow fiber membrane.
- An ink jet printer is an ink jet printer in which ink stored in an ink storage portion is supplied to an ink jet head through an ink flow path, and any one of the hollow fiber degassing modules is an ink. It is attached to the flow path.
- the hollow fiber degassing module is attached to the ink flow path, a rapid increase in pressure loss in the ink flow path can be suppressed, and ink can be removed for a long period of time. I can mind.
- a rapid increase in pressure loss can be suppressed.
- FIG. 1 is a schematic configuration diagram of an inkjet printer according to an embodiment. It is a schematic sectional drawing of the hollow fiber deaeration module concerning an embodiment.
- FIG. 3 is a partially enlarged view of the hollow fiber membrane bundle shown in FIG. 2.
- FIG. 4 is a sectional view taken along line IV-IV shown in FIG. 2.
- It is a perspective view of a support body. It is a perspective view of a support body.
- the hollow fiber degassing module of the present embodiment is an application of the hollow fiber degassing module of the present invention to a hollow fiber degassing module for degassing ink.
- the same or corresponding parts are denoted by the same reference numerals, and redundant description is omitted.
- FIG. 1 is a schematic configuration diagram of an inkjet printer according to an embodiment.
- an inkjet printer 11 mainly includes an ink storage unit 12 such as an ink tank that stores ink, and an inkjet head 13 that directly sprays the atomized ink onto a print medium.
- a hollow fiber deaeration module 1 according to an embodiment that is attached and deaerates ink, a suction pump 16 that performs vacuum suction, and an intake pipe 17 that connects the suction pump 16 and the hollow fiber deaeration module 1 are provided.
- the first ink supply pipe 14 and the second ink supply pipe 15 are ink flow paths from the ink reservoir 12 to the inkjet head 13.
- the ink used in the inkjet printer 11 is not particularly limited, and examples thereof include water-based ink, UV ink, solvent ink, and ceramic ink.
- FIG. 2 is a schematic cross-sectional view of the hollow fiber deaeration module according to the embodiment.
- FIG. 3 is a partially enlarged view of the hollow fiber membrane bundle shown in FIG. 4 is a cross-sectional view taken along line IV-IV shown in FIG.
- the hollow fiber deaeration module 1 includes a hollow fiber membrane bundle 3 in which a plurality of hollow fiber membranes 2 are bundled in a cylindrical shape, and an inner peripheral surface 3a of the hollow fiber membrane bundle 3.
- a support body 10 to be brought into contact with and a housing 4 for housing the hollow fiber membrane bundle 3 are provided.
- the hollow fiber degassing module 1 supplies ink from the hollow portion 3b of the hollow fiber membrane bundle 3 to the gap between the hollow fiber membranes 2 and depressurizes the inside of the hollow fiber membrane 2 to degas the ink.
- the hollow portion 3b is a hollow portion located on the radially inner side of the hollow fiber membrane bundle 3 formed in a cylindrical shape.
- each hollow fiber membrane 2 is described schematically and is different from an actual shape.
- the hollow fiber membrane 2 is a hollow fiber membrane that allows gas to permeate but not liquid.
- the hollow fiber membrane 2 has a property of swelling with ink.
- the material, membrane shape, membrane form, etc. of the hollow fiber membrane 2 are not particularly limited.
- Examples of the material of the hollow fiber membrane 2 include polyolefin resins such as polypropylene and poly (4-methylpentene-1), silicone resins such as polydimethylsiloxane and copolymers thereof, and fluorine resins such as PTFE and vinylidene fluoride. Resin.
- the membrane shape (side wall shape) of the hollow fiber membrane 2 include a porous membrane, a microporous membrane, and a homogeneous membrane (non-porous membrane) having no porosity.
- a symmetric membrane in which the chemical or physical structure of the entire membrane is homogeneous
- an asymmetric membrane inhomogeneous in which the chemical or physical structure of the membrane varies depending on the membrane part.
- An asymmetric membrane is a membrane having a non-porous dense layer and a porous structure. In this case, the dense layer may be formed anywhere in the membrane, such as the surface layer portion of the membrane or the inside of the porous membrane.
- the heterogeneous film includes a composite film having a different chemical structure and a multilayer structure film such as a three-layer structure.
- a heterogeneous film using poly (4-methylpentene-1) resin has a dense layer that blocks the liquid, and thus is particularly preferable for deaeration of liquids other than water, such as ink.
- a dense layer is formed on the outer surface of the hollow fiber.
- the hollow fiber membrane bundle 3 can be formed by, for example, a hollow fiber membrane sheet (not shown) in which a plurality of hollow fiber membranes 2 are woven in a hook shape.
- the hollow fiber membrane bundle 3 can be formed by a hollow fiber membrane sheet composed of 30 to 90 hollow fiber membranes 2 per inch.
- a hollow portion 3b serving as an ink flow path is formed on the radially inner side of the hollow fiber membrane bundle 3.
- the hollow portion 3 b is defined by the inner peripheral surface 3 a of the hollow fiber membrane bundle 3.
- the support 10 is a member that contacts the inner peripheral surface 3 a of the hollow fiber membrane bundle 3 and supports the hollow fiber membrane 2 from the inside in the radial direction of the hollow fiber membrane bundle 3. .
- the support 10 is formed in a cylindrical shape (pipe shape).
- the outer diameter of the support 10 is substantially the same as the inner diameter of the hollow fiber membrane bundle 3.
- the thickness of the support 10 can be appropriately set, for example, within a range in which the pressure loss of ink passing through the inside of the support 10 in the radial direction does not increase.
- the thickness of the support body 10 can be suitably set in the range which can support the swollen hollow fiber membrane 2, for example.
- the support 10 is formed in a net shape.
- the net shape refers to a shape in which a plurality of linear portions 101 extending in different directions are connected and a mesh 102 is formed by the plurality of linear portions 101.
- the support body 10 does not have the function of distributing ink evenly over the entire hollow fiber membrane bundle 3 as in a conventional water supply pipe.
- Examples of the shape of the mesh 102 include a square, a rectangle, a pentagon, a hexagon, a circle, and an ellipse.
- the porosity of the support 10 can be, for example, 10% or more, preferably 20% or more and 80% or less, and more preferably 30% or more and 60% or less. . Note that the porosity of the support 10 refers to the ratio of the mesh 102 to the area of the outer peripheral surface of the support 10 including the mesh 102.
- the support 10 shown in FIG. 5 has a plurality of first linear portions 101a that extend in a direction parallel to the axial direction of the support 10 and are arranged in a circle, and a circle centered on the axis of the support 10.
- the plurality of second linear portions 101b extending and connected to the first linear portions 101a.
- the shape of the mesh 102 of the support 10 shown in FIG. 5 is a square.
- the support 10 shown in FIG. 6 includes a plurality of first linear portions 101 a extending in a direction inclined by a predetermined angle with respect to the axial direction of the support 10, and the first linear portions with respect to the axial direction of the support 10.
- a plurality of second linear portions 101b extending in a direction inclined by a predetermined angle in the opposite direction to 101a and connected to the first linear portions 101a.
- the shape of the mesh 102 of the support 10 shown in FIG. 6 is a rhombus.
- the support 10 is preferably made of a resin from the viewpoint of ease of manufacture.
- the resin used for the support 10 include polypropylene and polyethylene, preferably ultrahigh molecular weight polyethylene and high density polyethylene.
- the support 10 is disposed between the one end face 3c and the other end face 3d of the hollow fiber membrane bundle 3 in the direction of the central axis L1 of the hollow fiber membrane bundle 3. That is, the support 10 is accommodated in the hollow fiber membrane bundle 3 without protruding from the one end surface 3c and the other end surface 3d of the hollow fiber membrane bundle 3.
- the support 10 is preferably the same length as the hollow fiber membrane bundle 3 in the central axis L1 direction, but may be shorter than the hollow fiber membrane bundle 3.
- the support 10 and the hollow fiber membrane bundle 3 have the same length, and both end surfaces of the support 10 are positioned on the one end surface 3 c and the other end surface 3 d of the hollow fiber membrane bundle 3. Is shown.
- the housing 4 includes a cylindrical body 5, a first lid portion 6, and a second lid portion 7.
- the cylinder 5 is a part in which the hollow fiber membrane bundle 3 is accommodated.
- the cylindrical body 5 is formed in a cylindrical shape extending in the axial direction L, and both ends of the cylindrical body 5 are open.
- a first lid portion 6 is attached to one side opening end portion 5 a that is an opening end portion on one side of the cylindrical body 5, and on the other side opening end portion 5 b that is an opening end portion on the other side of the cylindrical body 5.
- the second lid portion 7 is attached.
- the first lid portion 6 and the second lid portion 7 can be attached to the cylindrical body 5 by, for example, screwing, fitting, adhesion, or the like.
- the first lid portion 6 is formed in a tapered shape with a smaller diameter as the distance from the cylindrical body 5 increases.
- a supply port 6 a for supplying ink into the first lid 6 is formed at the tip of the first lid 6.
- the supply port 6 a is a circular opening and is formed on the central axis L ⁇ b> 2 of the cylinder 5.
- a connecting portion 6b for detachably connecting the first ink supply pipe 14 extends along the axial direction L from the supply port 6a.
- the connecting portion 6b is formed in a cylindrical shape, and a female screw 6c into which the first ink supply pipe 14 is screwed is formed on the inner peripheral surface of the connecting portion 6b.
- the connection between the connecting portion 6b and the first ink supply pipe 14 is not limited to screwing, and may be performed by fitting, for example.
- the second lid portion 7 is formed in a tapered shape with a smaller diameter as the distance from the cylindrical body 5 increases.
- An air inlet 7 a for sucking gas from inside the housing 4 is formed at the tip of the second lid portion 7.
- the air inlet 7 a is a circular opening and is formed on the central axis L ⁇ b> 2 of the cylinder 5.
- a connection portion 7b for detachably connecting the intake pipe 17 extends along the axial direction L from the intake port 7a.
- the connecting portion 7b is formed in a cylindrical shape, and a female screw 7c into which the intake pipe 17 is screwed is formed on the inner peripheral surface of the connecting portion 7b.
- the connection between the connection portion 7b and the intake pipe 17 is not limited to screwing, and may be performed by fitting, for example.
- a discharge port 5 d for discharging ink from the inside of the housing 4 is formed in the side wall 5 c of the cylindrical body 5.
- the discharge port 5d is a circular opening.
- the discharge port 5d is formed on the other open end 5b side from the center in the axial direction L of the cylindrical body 5.
- a connecting portion 5e for detachably connecting the second ink supply pipe 15 extends from the discharge port 5d along a direction orthogonal to the axial direction L.
- the connecting portion 5e is formed in a cylindrical shape, and a female screw 5f into which the second ink supply pipe 15 is screwed is formed on the inner peripheral surface of the connecting portion 5e.
- the connection between the discharge port 5d and the second ink supply pipe 15 is not limited to screwing, and may be performed by fitting, for example.
- the cylindrical body 5, the first lid portion 6 and the second lid portion 7 are preferably made of resin from the viewpoint of ease of manufacture.
- the cylindrical body 5, the first lid portion 6, and the second lid portion 7 can be manufactured by injection molding.
- the cylinder 5, the 1st cover part 6, and the 2nd cover part 7 are the color which does not permeate
- the one side membrane bundle end part 3e of the hollow fiber membrane bundle 3 is being fixed to the one side opening end part 5a of the cylinder 5 by the sealing part 8
- the other side membrane bundle end part of the hollow fiber membrane bundle 3 3 f is fixed to the other open end 5 b of the cylinder 5 by the sealing portion 9.
- the sealing portion 8 is made of resin.
- the resin used for the sealing portion 8 include epoxy resins, urethane resins, ultraviolet curable resins, and polyolefin resins such as polyethylene and polypropylene.
- the sealing portion 8 is filled in the entire region other than the hollow portion 3 b. That is, the sealing part 8 is filled with the sealing part 8 only between the hollow fiber membranes 2, inside the hollow fiber membranes 2, and between the hollow fiber membrane bundle 3 and the inner wall of the cylindrical body 5. (See FIG. 3 (a)).
- the communication port 8a which connects the hollow part 3b and the cylinder 5 exterior is formed. For this reason, the ink supplied from the supply port 6 a into the first lid portion 6 is supplied into the cylinder 5 only from the communication port 8 a and is supplied to the outside of the hollow fiber membrane 2 in the cylinder 5.
- the sealing part 9 is formed of the same resin as the sealing part 8.
- the sealing portion 9 is filled in the entire region other than the inside of the hollow fiber membrane 2 in a cross section perpendicular to the axial direction L of the cylindrical body 5. That is, the sealing portion 9 is not filled inside the hollow fiber membrane 2 but only between the hollow fiber membranes 2, between the hollow fiber membrane bundle 3 and the inner wall of the cylindrical body 5, and only in the hollow portion 3 b. (See FIG. 3B).
- the support body 10 is arrange
- the sealing part 9 is filled.
- the ink supplied to the cylinder 5 is prevented from flowing into the second lid portion 7 beyond the sealing portion 9. Further, since the inside of the hollow fiber membrane 2 and the inside of the second lid portion 7 are communicated with each other, the inside of the hollow fiber membrane 2 is decompressed by sucking air from the air inlet 7a by the suction pump 16.
- the sealing portion 8 is, for example, one side of the hollow fiber membrane bundle 3 such that the central axis L1 of the one side membrane bundle end 3e of the hollow fiber membrane bundle 3 and the central axis L2 of the cylindrical body 5 are at the same position.
- the film bundle end portion 3e is fixed to the cylindrical body 5.
- the sealing portion 9 is formed of the hollow fiber membrane bundle 3 such that, for example, the central axis L1 of the other membrane bundle end 3f of the hollow fiber membrane bundle 3 and the central axis L2 of the cylindrical body 5 are at the same position.
- the other side membrane bundle end 3 f is fixed to the cylinder 5.
- the sealing portion 9 is, for example, a position where the central axis L1 of the other membrane bundle end portion 3f of the hollow fiber membrane bundle 3 is eccentric to the opposite side of the discharge port 5d with respect to the central axis L2 of the cylindrical body 5.
- the other membrane bundle end 3 f of the hollow fiber membrane bundle 3 may be fixed to the cylindrical body 5.
- the ratio of the inner diameter D of the cylindrical body 5 to the length in the axial direction L of the hollow fiber membrane bundle 3 is preferably 1: 1 to 1: 6.
- the ink supplied from the ink reservoir 12 to the first ink supply pipe 14 is supplied into the first lid 6 from the supply port 6a.
- the ink supplied into the first lid portion 6 is supplied to the hollow portion 3b through the communication port 8a.
- the ink supplied to the hollow portion 3 b passes through the mesh 102 of the support 10, is supplied to the gap between the hollow fiber membranes 2, and further flows to the outside in the radial direction of the cylinder 5 through the gap. That is, the ink supplied to the hollow portion 3 b is supplied to the outside of the hollow fiber membrane 2 in the cylindrical body 5.
- the inside of the hollow fiber membrane 2 is depressurized by operating the suction pump 16 to suck in the housing 4 from the air inlet 7a.
- the ink passes between the hollow fiber membranes 2, dissolved gas and bubbles are drawn from the ink to the inside of the hollow fiber membrane 2. Thereby, the ink is deaerated.
- the degassed ink flows into the second ink supply pipe 15 from the discharge port 5d, and is supplied from the second ink supply pipe 15 to the inkjet head 13.
- the hollow fiber membrane 2 swells with ink over time.
- the speed and degree of swelling of the hollow fiber membrane 2 varies depending on the material, membrane shape, membrane form, etc. of the hollow fiber membrane 2, and also varies depending on the type of ink. For example, when a polyolefin resin is used as the material of the hollow fiber membrane 2 and a ceramic ink in which ceramic powder is dispersed in a solvent is used as the ink, the swelling speed and the degree of swelling of the hollow fiber membrane 2 are particularly increased. Then, the swollen hollow fiber membrane 2 tends to twist and flatten, and tries to enter the hollow portion 3b.
- the solvent used in the ceramic ink is not particularly limited as long as it does not impair the effects of the present invention, and may be a known one, but specific examples include ethylene glycol and diethylene glycol.
- Glycols such as triethylene glycol, glycol monoalkyl ethers such as 3-methoxy-3-methylbutanol and 3-methoxybutanol, diethylene glycol diethyl ether, diethylene glycol methyl ethyl ether, diethylene glycol methyl butyl ether, triethylene glycol methyl butyl ether, tetra Glycol dialkyl ethers such as ethylene glycol dimethyl ether, ethylene glycol monobutyl ether acetate, diethylene glycol monobutyl ether Glycol monoacetates such as cetate, propylene glycol monomethyl ether acetate, glycol diacetates, alcohols such as ethanol, n-propanol, isopropanol, n-butanol, 2-
- Aromatic hydrocarbons such as hydrogen, benzene, toluene, xylene Terpenes, ethers, cyclic imides, 3-methyl-2-oxazolidinones, 3-alkyl-2-oxazolidinones, such as 3-alkyl-2-oxazolidinones, N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone N-alkylpyrrolidone such as ⁇ -butyrolactone, lactone such as ⁇ -caprolactone, and nitrogen-containing solvents such as ⁇ -alkoxypropionamide.
- Aromatic hydrocarbons such as hydrogen, benzene, toluene, xylene Terpenes, ethers, cyclic imides, 3-methyl-2-oxazolidinones, 3-alkyl-2-oxazolidinones, such as 3-alkyl-2-oxazolidinones, N-methyl-2-pyrrolidone, N-eth
- the support 10 is in contact with the inner peripheral surface 3a of the hollow fiber membrane bundle 3 that defines the hollow portion 3b, the swollen hollow fiber membrane 2 is suppressed from being twisted and flattened. At the same time, entry into the hollow portion 3b is suppressed. As a result, in the hollow fiber deaeration module 1, even if the hollow fiber membrane 2 swells, it is possible to suppress the ink flow path from being narrowed or blocked, thereby suppressing a rapid increase in ink pressure loss. can do.
- the hollow fiber deaeration module 1 is an external perfusion type that supplies ink to the outside of the hollow fiber membrane 2 and degass the ink by decompressing the inside of the hollow fiber membrane 2. .
- the pressure loss of ink can be suppressed low.
- the hollow fiber degassing module 1 is mounted on the ink jet printer 11 that supplies ink from the ink reservoir 12 to the ink jet head 13 by the weight of the ink, the ink can be appropriately supplied to the ink jet head 13. it can.
- each hollow fiber membrane 2 is supported from the radial direction center side of the hollow fiber membrane bundle 3. Supported by the body 10. For this reason, even if the hollow fiber membrane 2 swells with ink, it can suppress that the hollow fiber membrane 2 twists. That is, it is possible to suppress the swollen hollow fiber membrane 2 from entering the hollow portion 3b of the hollow fiber membrane bundle 2 serving as the ink flow path and narrowing or closing the hollow portion 3b. Moreover, it can suppress that the swollen hollow fiber membrane 2 narrows or closes the gap between the hollow fiber membranes 2. In this way, even if the hollow fiber membrane 2 swells, it is possible to suppress the ink flow path from being narrowed or blocked, so that the pressure loss of the hollow fiber deaeration module 1 is rapidly increased. Can be suppressed.
- the support 10 is cylindrical, the inner peripheral surface 3a of the hollow fiber membrane bundle 3 can be supported as a whole.
- the support 10 is net-like, it is possible to suppress an increase in pressure loss when the ink passes through the support 10. Thereby, it can suppress that the initial pressure of a hollow fiber deaeration module rises.
- the initial pressure of a hollow fiber deaeration module raises by making the aperture ratio of the support body 10 or more 10%, and the aperture ratio of the support body 10 is 80% or less. By doing, it can suppress that the supporting force of the hollow fiber membrane 2 by the support body 10 falls too much.
- the support 10 is disposed between the one end face 3 c and the other end face 3 d of the hollow fiber membrane bundle 3, the support 10 can be accommodated in the cylinder 5. Thereby, since it becomes easy to produce the hollow fiber deaeration module 1, the manufacturing cost of the hollow fiber deaeration module 1 can be suppressed.
- the hollow fiber degassing module 1 is attached to the ink flow path including the first ink supply pipe 14 and the second ink supply pipe 15, so that the pressure loss in the ink flow path
- the ink can be deaerated over a long period of time.
- the support has been described as having a cylindrical shape.
- the support has any shape. May be.
- the support has been described as having a net-like shape.
- the support may not have a net-like shape.
- ink is exemplified as the liquid to be deaerated.
- the liquid to be deaerated may be a liquid other than the ink.
- the ink is supplied from the supply port 6a into the housing 4 and the ink in the housing 4 is discharged from the discharge port 5d.
- the ink inlet and the outlet may be reversed. . That is, the ink may be supplied from the discharge port 5d into the housing 4 and the ink in the housing 4 may be discharged from the supply port 6a.
- the test circuit connects the first ink supply pipe 22 inserted into the ink tank 21 in which the ink is stored to the supply port of the hollow fiber degassing module.
- a pump 23 for feeding the ink in the first ink supply pipe 22 to the hollow fiber degassing module side and an inlet pressure gauge 24 for measuring the pressure of the ink in the first ink supply pipe 22 were attached.
- the test circuit connects the second ink supply pipe 25 inserted into the ink tank 21 to the discharge port of the hollow fiber degassing module, and connects the ink in the second ink supply pipe 25 to the second ink supply pipe 25.
- An outlet pressure gauge 26 for measuring the pressure was attached.
- Example 1 The hollow fiber deaeration module of Example 1 was produced as follows.
- Example 1 a SEPAREL EF-G5 hollow fiber degassing module manufactured by DIC Corporation was used as a base module.
- a die planetron sheet (mesh size (3 mm ⁇ 3 mm), thickness (1.4 mm)) manufactured by Dainippon Plastic Co., Ltd. is used on the inner peripheral surface of the hollow fiber membrane bundle.
- a hollow fiber membrane module of Example 1 was obtained by contacting a support wound in a cylindrical shape so as to be 14 mm. Specifically, a hollow fiber membrane having an inner diameter of 100 ⁇ m and an outer diameter of 180 ⁇ m having a heterogeneous side wall (membrane) made of poly-4 methylpentene-1 was produced.
- a large number of hollow fiber membranes arranged in the same row were woven in a hook shape with warps so that there were 61 hollow fiber membranes per inch, and a hollow fiber membrane sheet having a predetermined length was produced.
- a hollow fiber membrane sheet was wound around a cylindrical support to produce a cylindrical hollow fiber membrane bundle.
- the hollow fiber membrane bundle is inserted into the cylindrical body of the housing, the one side membrane bundle end of the hollow fiber membrane bundle is fixed to the one side open end of the cylindrical body by the sealing portion, and the hollow fiber membrane bundle The other side membrane bundle end of was fixed to the other side opening end of the cylindrical body by the sealing part.
- the hollow cover deaeration module of Example 1 was produced by attaching a 2nd cover part to the other side opening end part of a cylinder.
- Table 1 shows the main conditions of the hollow fiber degassing module of Example 1.
- Example 2 As a support, a netron pipe (PX-225-2000, BK, outer diameter (14.6 mm), inner diameter (13.6 mm), pitch (extrusion 10 mm, width reference value 0.8 mm) manufactured by Moriroku Chemicals Co., Ltd. Pipe diameter ⁇ (14 mm) was used. Other conditions were the same as in Example 1, and a hollow fiber degassing module of Example 2 was produced. Table 1 shows the main conditions of the hollow fiber degassing module of Example 2.
- Example 3 As a support, a netron pipe (PX-225-2000, BK, outer diameter (14.6 mm), inner diameter (13.6 mm), pitch (extrusion (10 mm), width reference value (0. 8 mm)) and pipe diameter ⁇ (10 mm) The other conditions were the same as in Example 1. A hollow fiber deaeration module of Example 3 was produced. The main conditions are shown in Table 1.
- Comparative Example 1 A hollow fiber deaeration module of Comparative Example 1 was produced in the same manner as in Example 2 except that the support was removed from the hollow fiber membrane bundle after the resin in the sealing portion was cured. That is, as the hollow fiber degassing module of Comparative Example 1, a SEPAREL EF-G5 hollow fiber degassing module manufactured by DIC Corporation was used. Table 1 shows the main conditions of the hollow fiber degassing module of Comparative Example 1.
- Example 2 In the experiment, a ceramic ink containing a hydrocarbon solvent (“Exxsol (registered trademark) D130” manufactured by ExxonMobil Corporation (Hydrocarbones, C14-C18, n-alkanes, iso-alkanes, cyclics, aromatics, etc.)) is used.
- the set temperature of the ink was 45 ° C.
- the ink is circulated at a set flow rate of ink of 200 g / min, and the difference between the inlet pressure measured by the inlet pressure gauge 24 and the outlet pressure measured by the outlet pressure gauge 26 is calculated as a pressure loss.
- the flow rate of ink was measured with a flow meter (not shown).
- (2) the ink is circulated at a set ink flow rate of 1000 g / min, and the difference between the inlet pressure measured by the inlet pressure gauge 24 and the outlet pressure measured by the outlet pressure gauge 26 is calculated as a pressure loss.
- the ink flow rate was measured with a flow meter (not shown).
- the pressure loss calculated in (1) and (2) was used as the initial value.
- the ink set flow rate was set to 1000 g / min and left for an arbitrary time. Thereafter, (4) the ink is circulated at a set flow rate of 200 g / min, and the difference between the inlet pressure measured by the inlet pressure gauge 24 and the outlet pressure measured by the outlet pressure gauge 26 is calculated as a pressure loss. The flow rate of ink was measured with a flow meter (not shown). Next, (5) the ink is circulated at a set ink flow rate of 1000 g / min, and the difference between the inlet pressure measured by the inlet pressure gauge 24 and the outlet pressure measured by the outlet pressure gauge 26 is calculated as a pressure loss. The ink flow rate was measured with a flow meter (not shown). In addition, the leaving time of (3) was 23 hours in Example 1, two kinds of 24 hours and 47 hours in Example 2, and two kinds of 23 hours and 47 hours in Example 3.
- the ratio of the pressure loss calculated in (1) and (2) to the pressure loss calculated in (4) and (5) was calculated as the rate of increase in pressure loss.
- the experimental results of Examples 1 to 3 and Comparative Example 1 are shown in Table 2.
- FIG. 8 shows a graph of the experimental result of Example 1
- FIG. 9 shows a graph of the experimental result of Example 2
- FIG. 10 shows a graph of the experimental result of Example 3.
- FIG. 11 shows a graph of the experimental results of Comparative Example 1. (Evaluation 1)
- Table 2 and FIGS. 8 to 10 in all of Examples 1 to 3, no rapid increase in pressure loss was observed. From this result, it was found that an effect of suppressing a rapid increase in pressure loss can be obtained by providing the support.
- the hollow fiber membrane can be supported if the thickness of the support is about 1 mm. It was also found that the pipe diameter ⁇ of the support did not change greatly even when it was 10 mm or 14 mm. It was also found that in all of Examples 1 to 3, the pressure loss did not fluctuate greatly after the ink was circulated for about one day.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Degasification And Air Bubble Elimination (AREA)
- Ink Jet (AREA)
Abstract
Description
図7に示すように、試験回路は、インクが貯留されているインクタンク21に挿入された第一インク供給管22を、中空糸脱気モジュールの供給口に接続し、第一インク供給管22に、第一インク供給管22内のインクを中空糸脱気モジュール側に送液するポンプ23と、第一インク供給管22内のインクの圧力を計測する入口圧力計24と、を取り付けた。また、試験回路は、インクタンク21に挿入された第二インク供給管25を、中空糸脱気モジュールの排出口に接続し、第二インク供給管25に、第二インク供給管25内のインクの圧力を計測する出口圧力計26を取り付けた。
実施例1の中空糸脱気モジュールは、次の通り作製した。
支持体として、森六ケミカルズ株式会社製のネトロンパイプ(PX-225-2000、BK、外径(14.6mm)、内径(13.6mm)、ピッチ(押出10mm、幅 参考値 0.8mm)、パイプ径φ(14mm))を用いた。その他の条件は、実施例1と同様にして、実施例2の中空糸脱気モジュールを作製した。実施例2の中空糸脱気モジュールの主な条件を表1に示す。
支持体として、森六ケミカルズ株式会社製のネトロンパイプ(PX-225-2000、BK、外径(14.6mm)、内径(13.6mm)、ピッチ(押出(10mm)、幅 参考値(0.8mm))、パイプ径φ(10mm)を用いた。その他の条件は、実施例1と同様にして、実施例3の中空糸脱気モジュールを作製した。実施例3の中空糸脱気モジュールの主な条件を表1に示す。
封止部の樹脂が硬化した後に中空糸膜束から支持体を抜いた他は、実施例2と同様にして、比較例1の中空糸脱気モジュールを作製した。つまり、比較例1の中空糸脱気モジュールとして、DIC株式会社製のSEPAREL EF-G5の中空糸脱気モジュールを用いた。比較例1の中空糸脱気モジュールの主な条件を表1に示す。
実験では、炭化水素溶媒(エクソンモービル株式会社製「Exxsol(登録商標) D130」(Hydrocarbones, C14-C18, n-alkanes, iso-alkanes, cyclics, aromatics等))を含有するセラミックインクを使用し、インクの設定温度を45℃とした。
表2及び図8~図10に示すように、実施例1~3の何れも、圧力損失の急激な上昇は見られなかった。この結果から、支持体を備えることで、圧力損失の急激な上昇を抑制する効果が得られることが分かった。また、支持体の厚みが1mm程度あれば中空糸膜を支持できることも分かった。また、支持体のパイプ径φは10mmでも14mmでも大きく変わらないことが分かった。また、実施例1~3の何れも、1日程度インク循環させた後は、圧力損失が大きく変動しないことも分かった。
表2、図9及び図11に示すように、実施例2と比較例1とを比較した結果、実施例2では、圧力損失の急激な上昇は見られなかったのに対し、比較例1では、1日も経過しないうちに、圧力損失が急激に上昇したことが分かった。特に、インクの設定流量を1000g/minにした際の圧力損失の上昇率が顕著に見られた。この結果から、支持体を備えない場合比べて、支持体を備えることで、圧力損失の急激な上昇を抑制する効果が得られることが分かった。なお、比較例1においても、1日程度インクを循環させた後は、圧力損失が大きく変動しないことも分かった。
Claims (5)
- 複数本の中空糸膜が円筒状に束ねられた中空糸膜束と、前記中空糸膜束が収容されて軸線方向に延びる筒体と、を備え、前記中空糸膜束の中空部から前記中空糸膜間の隙間に液体を供給するとともに前記中空糸膜の内側を減圧することで、前記液体を脱気する中空糸脱気モジュールであって、
前記中空糸膜束の内周面に当接される支持体を備える、
中空糸脱気モジュール。 - 前記支持体は、円筒状である、
請求項1に記載の中空糸脱気モジュール。 - 前記支持体は、網状である、
請求項1又は2に記載の中空糸脱気モジュール。 - 前記支持体は、前記中空糸膜の中心軸線方向において、前記中空糸膜束の一方側端面と他方側端面との間に配置されている、
請求項1~3の何れか一項に記載の中空糸脱気モジュール。 - インク貯留部に貯留されたインクがインク流路を通ってインクジェットヘッドに供給されるインクジェットプリンタであって、
請求項1~4の何れか一項に記載の中空糸脱気モジュールが前記インク流路に取り付けられている、
インクジェットプリンタ。
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IL252527A0 (en) | 2017-07-31 |
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