Liquid jet device

Abstract

To provide a liquid jet device configured to make a head part jet liquid for washing a material adhering to an object, which can enhance washing effect while suppressing jetting quantities.SOLUTION: A liquid jet device 1 comprises a head part 2 that jets liquid 3, and liquid carrying pipes 7 through which the liquid 3 is carried to the head part 2. The liquid 3 includes a solvent and a washing agent that is stronger in washing force for washing a material adhering to an object than the solvent, where the content of the washing agent contained in the liquid 3 is 1 weight% or larger. The liquid jet device makes the head part 2 jet the liquid 3 by continuous flow 3a and forms the continuous flow 3a into droplets to make the continuous flow formed into droplets 3b collide with the object.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a liquid ejection apparatus. [Background technology]

[0002] Various liquid ejection devices have been used to eject liquid onto an object. Among these liquid ejection devices, there is a liquid ejection device that ejects a liquid from a head unit to clean deposits attached to the object. For example, Patent Document 1 discloses a high-pressure cleaning system that includes a high-pressure pump to increase the ejection pressure from a discharge unit of a cleaning liquid, which is a liquid that cleans deposits attached to the object. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2017-533095 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in a conventional liquid injection device such as that described in Patent Document 1, which ejects a liquid from a head unit to clean deposits adhering to an object, the amount of ejection is too large, limiting the locations and applications in which it can be used.On the other hand, in a conventional liquid injection device which ejects a liquid such as water in a continuous stream from a head unit and converts the continuous stream into droplets that collide with an object in the form of droplets, although it is possible to reduce the amount of ejection, the cleaning power when cleaning deposits adhering to the object may not be sufficient. [Means for solving the problem]

[0005] In order to solve the above problem, the liquid injection device of the present invention comprises a head unit that injects liquid and a liquid transport pipe that transports the liquid to the head unit, the liquid containing a solvent and a cleaning agent that has a stronger cleaning power than the solvent to clean deposits attached to an object, the content of the cleaning agent in the liquid being 1% by weight or more, and the liquid being injected in a continuous stream from the head unit and the continuous stream being converted into droplets that collide with the object in the form of droplets. [Brief explanation of the drawings]

[0006] [Figure 1] 1 is a schematic diagram illustrating a liquid ejecting apparatus according to a first embodiment. [Figure 2] 6 is a graph showing the cleaning effect achieved by using the liquid ejection device of Example 1 and the like. [Figure 3] 6 is a graph showing the effect of adding a cleaning agent when using the liquid ejecting device of Example 1. [Figure 4] 6 is a graph showing the correlation between the amount of detergent added and the cleaning effect, measured using the liquid ejecting device of Example 1. [Figure 5] FIG. 10 is a schematic diagram illustrating a liquid ejecting apparatus according to a second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0007] First, the present invention will be briefly described. In order to solve the above problem, a first aspect of the present invention provides a liquid injection device comprising a head unit for injecting a liquid and a liquid transport pipe for transporting the liquid to the head unit, wherein the liquid contains a solvent and a cleaning agent having a stronger cleaning power than the solvent for cleaning deposits attached to an object, the cleaning agent content in the liquid being 1% by weight or more, and wherein the liquid is injected in a continuous stream from the head unit and the continuous stream is converted into droplets which are then caused to collide with the object in the form of droplets.

[0008] According to this aspect, the liquid is sprayed from the head in a continuous stream, and the continuous stream is converted into droplets that collide with the target object. The liquid contains 1% by weight or more of a cleaning agent. This reduces the amount of spray, and the cleaning effect can be enhanced by including 1% by weight or more of a cleaning agent in the liquid.

[0009] A second aspect of the present invention is the liquid ejecting device of the first aspect, characterized in that the content of the cleaning agent in the liquid is 10% by weight or less.

[0010] According to this embodiment, the content of the detergent is 1% by weight or more and 10% by weight or less. While the cleaning effect is enhanced by including 1% by weight or more of the detergent, the cleaning effect is not further improved even if the content exceeds 10% by weight. On the other hand, by including 10% by weight or less of the detergent, it is possible to prevent the deterioration of workability and the increase in the cost of the liquid caused by the tendency to foam when the detergent is included in an amount exceeding 10% by weight.

[0011] A third aspect of the present invention is a liquid injection device according to the first or second aspect, characterized in that it is provided with a liquid storage section for storing the liquid, and the liquid transport pipe transports the liquid from the liquid storage section to the head section.

[0012] According to this aspect, the liquid storage section is provided for storing the liquid, and the liquid transport pipe transports the liquid from the liquid storage section to the head section. By adopting such a configuration, it is possible to simplify the device configuration and suppress increases in the manufacturing costs of the device.

[0013] A fourth aspect of the present invention is a liquid injection device according to the first or second aspect, characterized in that it comprises a solvent storage section for storing the solvent, a cleaning agent storage section for storing the cleaning agent, and a mixing section connected to the solvent storage section and the cleaning agent storage section for mixing the solvent and the cleaning agent, and the liquid transport pipe transports the liquid from the mixing section to the head section.

[0014] According to this aspect, the apparatus includes a solvent reservoir, a cleaning agent reservoir, and a mixing section, and the liquid transport pipe transports the liquid from the mixing section to the head section. This configuration facilitates changing the mixture ratio of the solvent and the cleaning agent. Furthermore, for example, the cleaning agent can be mixed with the solvent immediately before being sprayed from the head section, thereby reducing the amount of cleaning agent remaining in the apparatus.

[0015] A fifth aspect of the present invention is a liquid injection device according to the fourth aspect, further comprising a control unit that controls the mixing ratio of the solvent and the cleaning agent mixed in the mixing unit, and the control unit is capable of controlling the amount of liquid injected from the head unit and changing the mixing ratio according to the amount of liquid injected.

[0016] According to this aspect, the amount of liquid sprayed can be controlled, and the mixture ratio of the solvent and the cleaning agent can be changed according to the amount of liquid sprayed, so that an appropriate mixture ratio can be automatically achieved according to the amount of liquid sprayed.

[0017] A sixth aspect of the liquid injection device of the present invention is characterized in that, in the fourth aspect, a liquid supply unit is provided between the solvent reservoir and the head unit, which supplies the solvent from the solvent reservoir to the head unit, and the mixing unit is provided between the liquid supply unit and the head unit.

[0018] According to this aspect, the mixing section is provided between the liquid supply section and the head section, which prevents the cleaning agent from entering the liquid supply section, thereby reducing the amount of cleaning agent residue in the liquid supply section and facilitating maintenance of the liquid supply section.

[0019] A seventh aspect of the present invention is a liquid ejecting device according to the first or second aspect, characterized in that the head portion has at least one nozzle, and the nozzle has a hole diameter of 0.01 mm or more and 0.15 mm or less.

[0020] According to this aspect, the nozzle has an orifice diameter of 0.01 mm or more and 0.15 mm or less. This orifice diameter allows the liquid to be ejected suitably when the liquid is ejected as a continuous stream from the head and the continuous stream is converted into droplets that are then collided with an object in the form of droplets.

[0021] The liquid ejecting device of an eighth aspect of the present invention is the liquid ejecting device of the first or second aspect, characterized in that the ejection amount of the liquid from the head portion is 1 ml / min or more and 25 ml / min or less.

[0022] According to this aspect, the liquid ejection rate is 1 ml / min or more and 25 ml / min or less. By setting the liquid ejection rate at this rate, the liquid can be ejected suitably when the liquid is ejected as a continuous stream from the head and the continuous stream is turned into droplets that are then collided with the target in the form of droplets.

[0023] A ninth aspect of the present invention is the liquid ejecting device of the first or second aspect, characterized in that the ejection pressure of the liquid from the head portion is 0.5 MPa or more and 3.0 MPa or less.

[0024] According to this aspect, the liquid ejection pressure is 0.5 MPa or more and 3.0 MPa or less. By setting the liquid ejection pressure at this level, the liquid can be ejected suitably when the liquid is ejected as a continuous stream from the head and the continuous stream is turned into droplets that are then collided with the target object in the form of droplets.

[0025] [Example 1] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. First, an overview of a liquid ejection device 1 according to a first embodiment of the present invention will be described with reference to Fig. 1. The liquid ejection device 1 shown in Fig. 1 includes a head unit 2 having a nozzle 27, a liquid storage unit 8 that stores liquid 3 to be ejected, a liquid transport pipe 7 that connects the head unit 2 and the liquid storage unit 8, a liquid supply unit 6 that includes a pump and the like, and a control unit 5 that has a control signal line 52 to the liquid supply unit 6.

[0026] Using the liquid ejection device 1 configured as described above, a user can spray liquid 3 from the nozzles 27 of the head unit 2 and collide the liquid 3 against a desired object, thereby cleaning off deposits adhering to the object. The liquid ejection device 1 of this embodiment is a liquid ejection device in which a continuous stream 3a of liquid 3, which is continuously sprayed in direction b from the multiple nozzles 27 provided in the head unit 2, turns into droplets 3b, and causes the droplets 3b to collide against the object.

[0027] As described above, the liquid ejection device 1 of this embodiment is composed of a liquid storage section 8 that stores the liquid 3 as the ejection liquid, a liquid supply section 6 that delivers the liquid 3, a control section 5 that controls the operation of the liquid supply section 6, and the head section 2. Note that the liquid transport pipe 7 that serves as a liquid delivery flow path connecting the liquid storage section 8 to the head section 2 can be made of a soft resin material or the like to improve handling properties.

[0028] Furthermore, the hole diameter of each of the nozzles 27 provided in the head unit 2 is in the range of 0.01 mm to 0.15 mm, and by narrowing the hole diameter of the nozzles 27, a huge amount of liquid does not need to be delivered, making it possible to clean household items such as kitchen utensils and sanitary products with a small amount of liquid. The liquid supply unit 6 is driven under the control of the control unit 5 and delivers the liquid 3 at a predetermined pressure or a predetermined flow rate. The pressure or flow rate can be changed as desired by the user by inputting commands into the control unit 5.

[0029] Here, liquid 3 contains water as a solvent and a cleaning agent at a predetermined concentration. Water is preferably used as the solvent, and a surfactant is preferably used as the cleaning agent. The cleaning agent concentration is preferably 1% by weight or more, and more preferably 1% to 10% by weight. Liquid 3 of this embodiment also contains a cleaning agent at a predetermined concentration of 1% to 10% by weight. Furthermore, the cleaning agent preferably contains one or more of the following: carboxylates, sulfonates, sulfate ester salts, amine oxides, phosphate ester salts, alkyl glycosides, alkyl glycerols, alkylhydroxysulfobetaines and sodium dialkylsulfosuccinates, which are typical examples of amphoteric surfactants, and polyoxyethylene alkyl ethers, which are typical examples of nonionic surfactants.

[0030] However, there are no particular limitations on the solvent and cleaning agent, and the cleaning agent may be any substance that has a stronger cleaning power than the solvent for cleaning deposits attached to the object. Whether a cleaning agent has a stronger cleaning power than the solvent for cleaning deposits attached to the object can be determined by comparing the cleaning effect when spraying liquid 3, which is a solvent containing a cleaning agent, with the cleaning effect when spraying only the solvent under the same spraying conditions.

[0031] As described above, the liquid ejection device 1 of this embodiment includes the head unit 2 that ejects the liquid 3 and the liquid transport pipe 7 that transports the liquid 3 to the head unit 2. The liquid 3 contains water, which is an example of a solvent, and a cleaning agent that has a stronger cleaning power than the solvent to clean deposits attached to an object. The content of the cleaning agent in the liquid 3 is 1% by weight or more. The liquid ejection device 1 of this embodiment is a liquid ejection device that ejects the liquid 3 from the head unit 2 in a continuous stream 3a and converts the continuous stream 3a into droplets that collide with the object in the form of droplets 3b.

[0032] In this way, the liquid ejection device 1 of this embodiment ejects the liquid 3 from the head unit 2 in a continuous stream 3a, and also converts the continuous stream 3a into droplets, which collide with the target object as droplets 3b. The liquid 3 also contains 1% by weight or more of a cleaning agent. By employing this liquid ejection device 1, the amount of liquid 3 ejected can be reduced. Furthermore, by incorporating 1% by weight or more of a cleaning agent into the liquid 3, the cleaning effect can be enhanced.

[0033] As described above, in the liquid ejection device 1 of this embodiment, the content of the cleaning agent in the liquid 3 is 10% by weight or less. That is, the content of the cleaning agent in the liquid 3 of this embodiment is 1% by weight or more and 10% by weight or less. While the cleaning effect is enhanced by including 1% by weight or more of the cleaning agent, the cleaning effect is not further improved even if the cleaning agent is included in an amount greater than 10% by weight. On the other hand, by including 10% by weight or less of the cleaning agent, it is possible to prevent the deterioration of workability and the increase in the cost of the liquid 3 caused by the tendency for the cleaning agent to foam, which occurs when the cleaning agent is included in an amount greater than 10% by weight.

[0034] Furthermore, as described above, the liquid ejection device 1 of this embodiment includes the liquid storage section 8 that stores the liquid 3, and the liquid transport pipe 7 transports the liquid 3 from the liquid storage section 8 to the head section 2. By adopting such a configuration, the device configuration of the liquid ejection device 1 can be simplified, and an increase in the manufacturing cost of the liquid ejection device 1 can be suppressed.

[0035] As described above, the liquid ejection device 1 of this embodiment includes a head unit 2 having a plurality of nozzles 27. The head unit 2 has a plurality of nozzles 27, each having a hole diameter of 0.024 mm. Here, the hole diameter of the nozzles 27 is preferably 0.01 mm or more and 0.15 mm or less. By using such a hole diameter, the liquid 3 can be ejected suitably when the liquid 3 is ejected from the head unit 2 as a continuous stream 3a and the continuous stream 3a is converted into droplets 3b that collide with an object. Note that, although the head unit 2 of this embodiment has a plurality of nozzles 27, there is no particular limitation on the number of nozzles 27, and the number of nozzles 27 may be one.

[0036] The following describes the results of testing the effect of adding a cleaning agent when liquid 3, which is water with a cleaning agent added, was sprayed toward an object using liquid spray device 1, with reference to Figure 2. For this testing, liquid spray device 1 was used, which was equipped with a head unit 2 with a nozzle 27 having an orifice diameter of 0.024 mm and capable of spraying liquid 3. A mixture of pure water and 10% by weight of a commercially available cleaning agent was used as liquid 3, which was the spray liquid, and cleaning performance was compared between spraying pure water alone and spraying a mixture with 10% by weight of the commercially available cleaning agent added.

[0037] Specifically, a 5 cm square area of ​​commercially available peanut butter on a commercially available wooden cutting board was used as the cleaning target for evaluation. Specifically, the spray pressure was changed to four conditions: 0.5 MPa, 0.7 MPa, 1 MPa, and 3 MPa. Liquid spraying was performed for 60 seconds at each condition using Liquid Spraying Device 1. The degree of stain removal was evaluated based on the relative light unit (RLU) measurement using a Kikkoman Biochemifa Lumitester Smart. The commercially available cleaning solution was sprayed onto the target area, left for 60 seconds, and then rinsed with running water, according to the product's instruction manual.

[0038] The graph in Figure 2 shows the results of the above evaluation, with the horizontal axis representing the cleaning conditions and the vertical axis representing the luminescence intensity (hereinafter referred to as Lumitester luminescence intensity) using the Kikkoman Biochemifa Lumitester Smart. Figure 2 also shows the relative luminescence intensity under each of the above conditions. In Figure 2, the higher the luminescence intensity, the more the peanut butter was not removed from the cutting board and the more soiled it became. The average Lumitester luminescence intensity, which indicates the peanut butter stains on the cutting board before spreading it, shown on the far left of Figure 2, is approximately 6000 RLU. Figure 2 compares the peanut butter removal effectiveness of each test condition, using this value of approximately 6000 RLU as the standard.

[0039] The Lumitester's luminescence after application of peanut butter, shown as the second result from the left in Figure 2, is high at approximately 400,000 RLU. When the sample is then cleaned using a commercially available cleaning solution in accordance with the product's instructions, the Lumitester's luminescence drops to approximately 130,000 RLU, as shown as the third result from the left in Figure 2, but does not return to the state before application.

[0040] On the other hand, when cleaning with pure water at spray pressures of 0.5 MPa, 1 MPa, 3 MPa, and 5 MPa, a spray pressure of approximately 3 MPa or higher can remove dirt to the state before application. Furthermore, when cleaning with a mixed solution containing a cleaning solution at spray pressures of 0.5 MPa, 0.7 MPa, 1 MPa, and 3 MPa, a spray pressure of 0.7 MPa or higher can remove dirt to the state before application, and even a spray pressure of 0.5 MPa can remove dirt to a state close to that before application. Furthermore, even at a spray pressure of 0.5 MPa, the cleaning effect is significantly higher than when using a commercially available cleaning solution and cleaning in accordance with the product's instructions. From the above, it can be considered that spraying liquid 3 containing a cleaning agent onto an object in droplet form activates the cleaning action of the cleaning agent, promotes emulsification of the object being removed, and improves cleaning efficiency.

[0041] Figure 3 shows another evaluation of the cleaning effectiveness of pure water sprayed with detergent. The horizontal axis represents the jet irradiation time, which is the time it takes for the spray liquid to be sprayed onto the object in droplet form, and the vertical axis represents the amount of Lumitester light emitted. This graph compares the Lumitester light emitted by pure water and a mixed solution containing 10% detergent by weight for peanut butter stains on a cutting board at various jet irradiation times. As shown in Figure 3, the addition of detergent reduced the Lumitester light emitted by the mixed solution to approximately one-tenth of that of pure water when sprayed with Liquid 3 for 30 seconds, regardless of the spray pressure (0.5 MPa or 1.0 MPa). This demonstrates that adding detergent to pure water significantly improves cleaning effectiveness.

[0042] Next, we will use Figure 4 to explain the concentration of cleaning agent that provides the highest cleaning effect. In Figure 4, the horizontal axis represents cleaning agent concentration, and the vertical axis represents the amount of luminescence from the Lumitester. As shown in Figure 4, even when the cleaning agent concentration is reduced to 2.0 wt%, cleaning performance does not decrease compared to when the cleaning agent concentration is 10.0 wt%. It also shows that cleaning performance remains high even when the cleaning agent concentration is 1.0 wt%. Furthermore, when the cleaning agent concentration is 2.0 wt%, the spray pressure is 1 MPa, and the spray is performed for 60 seconds, the amount of cleaning agent used is 0.25 ml in undiluted form, which is approximately one-quarter of the amount of 0.90 ml normally used in accordance with the product's instruction manual.

[0043] Furthermore, it is preferable to adjust the amount of liquid 3 ejected from the head portion 2 to be 1 ml / min or more and 25 ml / min or less. As a result of extensive studies by the inventors, it was found that by adjusting the amount of liquid 3 ejected in this manner, the liquid 3 can be ejected suitably when the liquid 3 is ejected from the head portion 2 as a continuous stream 3a and the continuous stream 3a is turned into droplets 3b that collide with an object.

[0044] Furthermore, it is preferable to adjust the ejection pressure of the liquid 3 from the head portion 2 to be 0.5 MPa or more and 3.0 MPa or less. As a result of extensive studies by the inventors, it was found that by adjusting the ejection pressure of the liquid 3 to such a level, the liquid 3 can be ejected suitably when the liquid 3 is ejected from the head portion 2 as a continuous stream 3a and the continuous stream 3a is turned into droplets 3b that collide with an object.

[0045] [Example 2] A liquid injection device 1 of Example 2 will be described below with reference to FIG. 5. FIG. 5 is a diagram corresponding to FIG. 1 showing the liquid injection device 1 of Example 1. The liquid injection device 1 of this example is similar to the liquid injection device 1 of Example 1 except for the configuration described below. Therefore, the liquid injection device 1 of this example has similar features to the liquid injection device 1 of Example 1 except for the points described below, such as the configuration of the head unit 2 and the injection amount and injection pressure of the liquid 3. Therefore, in FIG. 5, components common to Example 1 above are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0046] As described above, the liquid ejection device 1 of Example 1 is configured to store the liquid 3, which is a mixture of water as a solvent and a cleaning agent, in the liquid storage section 8 as a jet liquid. Meanwhile, as shown in FIG. 5 , the liquid ejection device 1 of this example includes a solvent storage section 81 that stores water as a solvent 31 and a cleaning agent storage section 82 that stores cleaning agent 32. The liquid ejection device 1 of this example also includes a mixing section 4 between the liquid supply section 6 and the head section 2. The mixing section 4 is connected to the solvent storage section 81 and the cleaning agent storage section 82 via a liquid transport pipe 7 and mixes water as a solvent 31 with the cleaning agent 32 to produce the liquid 3. The liquid transport pipe 7 is configured to transport the liquid 3 from the mixing section 4 to the head section 2. This configuration of the liquid ejection device 1 of this example makes it easy to change the mixture ratio of the solvent 31 and the cleaning agent 32. Furthermore, for example, the cleaning agent 32 can be mixed with the solvent 31 immediately before being sprayed from the head section 2, thereby reducing the amount of cleaning agent remaining in the device.

[0047] In the liquid ejection device 1 of this embodiment, the control unit 5 is connected to the mixer 4 via a control signal line 53. The control unit 5 is configured to be able to control the mixing ratio of the solvent and cleaning agent mixed in the mixer 4, control the amount of liquid 3 sprayed from the head unit 2, and change the mixing ratio of the solvent 31 and cleaning agent 32 depending on the amount of liquid 3 sprayed. Therefore, the liquid ejection device 1 of this embodiment can automatically achieve an appropriate mixing ratio depending on the amount of liquid 3 sprayed.

[0048] In detail, the control unit 5 can start and stop the supply of the cleaning agent 32 and change the supply amount by managing the supply amount of the cleaning agent 32 to the mixer 4 via the liquid transport pipe 7. For example, the control unit 5 can control the supply of the cleaning agent 32 to the mixer 4 by opening and closing a solenoid valve (not shown) or by driving a linear switch (not shown) based on a signal to the liquid supply unit 6, thereby adjusting the supply amount of the cleaning agent 32 according to the amount of the solvent 31 sent so as to achieve a desirable cleaning agent concentration that is preset according to the state of dirt on the object to be cleaned. In this embodiment, one control unit 5 has the role of controlling both the liquid supply unit 6 and the mixer 4, but a control unit that controls the liquid supply unit 6 and a control unit that controls the mixer 4 may be provided separately.

[0049] Although water can be mainly used as the solvent stored in the solvent reservoir 81, a dedicated cleaning liquid or liquid 3 pre-mixed with cleaning agent 32 may be used as the liquid stored in the solvent reservoir 81 depending on the dirt components of the object to be cleaned and the cleaning area, and in this case, the supply of cleaning agent 32 from the cleaning agent reservoir 82 can be kept stopped at all times. With this configuration, by replacing the liquid stored in the solvent reservoir 81, once the object to be cleaned has been emulsified by spraying liquid 3 containing cleaning agent 32, the object to be cleaned can be washed away with the water flow by switching to spraying only water without cleaning agent 32. As a result, it is possible to prevent residue of cleaning agent components from drying and remaining on the spray surface, thereby improving water conservation.

[0050] Furthermore, the liquid ejection device 1 of this embodiment is provided with a liquid supply unit 6 between the solvent reservoir 81 and the head unit 2, which supplies the solvent 31 from the solvent reservoir 81 to the head unit 2, and the mixing unit 4 is provided between the liquid supply unit 6 and the head unit 2. Therefore, the cleaning agent 32 does not get mixed into the liquid supply unit 6, which reduces the amount of cleaning agent 32 remaining in the liquid supply unit 6 and makes maintenance of the liquid supply unit 6 easier.

[0051] In other words, in the liquid injection device 1 of this embodiment, by arranging the cleaning agent storage section 82 between the liquid supply section 6 and the head section 2, the components of the cleaning agent 32 do not adhere to the liquid supply section 6, and there is no need to run a lot of water to clean the inside of the liquid supply section 6, which prevents malfunctions and breakdowns of the liquid supply section 6, makes it easier to maintain and store it in the correct condition, and also improves water conservation.

[0052] In the configuration of this embodiment, similar to the liquid injection device 1 of the embodiment, when liquid 3 mixed with cleaning agent 32 was sprayed onto an object, a 5 cm square area of ​​peanut butter on a cutting board was sprayed. A spray pressure of 0.7 MPa removed the dirt to the same level as before application, and even a spray pressure of 0.5 MPa provided better cleaning effectiveness than commercially available cleaning solutions. These spray pressures, 0.5 MPa to 0.7 MPa, are within the range of tap water pressure. Connecting the flow path for water (solvent 31) to a regular tap eliminates the need for a separate liquid supply unit 6, allowing for easy and efficient cleaning using the liquid injection device 1. When connected to a tap, a flow meter can be placed in the liquid transport pipe 7, which is the flow path for liquid 3, to measure the liquid flow rate, and the amount of cleaning agent 32 supplied can be adjusted based on the measured value.

[0053] The present invention is not limited to the above-described embodiments, and can be realized in various configurations without departing from the spirit of the present invention. The technical features in the embodiments corresponding to the technical features in each aspect described in the Summary of the Invention can be appropriately replaced or combined to solve some or all of the above-described problems or achieve some or all of the above-described effects. Furthermore, if a technical feature is not described as essential in this specification, it can be deleted as appropriate. [Explanation of symbols]

[0054] 1...liquid ejection device, 2...head section, 3...liquid, 3a...continuous flow, 3b...droplets, 4...mixing section, 5...control section, 6...liquid supply section, 7...liquid transport pipe, 8...liquid storage section, 27...nozzle, 31...solvent, 32...cleaning agent, 52...control signal line, 53...control signal line, 81...solvent storage section, 82...cleaning agent storage section

Claims

1. A head unit that ejects liquid, and a liquid transport pipe that transports the liquid to the head unit, The liquid includes a solvent and a cleaning agent that cleans off any deposits attached to the object, The content of the cleaning agent in the liquid is 1% by weight or more of the liquid, A liquid ejection device comprising: a head portion that ejects the liquid in a continuous flow; a head portion that converts the continuous flow into droplets; and a liquid ejection device that causes the droplets to impinge on the target object.

2. The liquid ejection apparatus according to claim 1 , A liquid ejecting apparatus, comprising: a cleaning agent content in the liquid being 10% by weight or less of the liquid.

3. 3. The liquid ejection apparatus according to claim 1, A liquid storage section that stores the liquid, The liquid ejecting apparatus, wherein the liquid transport pipe transports the liquid from the liquid storage portion to the head portion.

4. 3. The liquid ejection apparatus according to claim 1, a solvent reservoir that stores the solvent, a cleaning agent reservoir that stores the cleaning agent, and a mixing section that is connected to the solvent reservoir and the cleaning agent reservoir and mixes the solvent and the cleaning agent, The liquid ejecting apparatus, wherein the liquid transport pipe transports the liquid from the mixing section to the head section.

5. The liquid ejection apparatus according to claim 4 , a control unit for controlling a mixing ratio of the solvent and the cleaning agent mixed in the mixing unit, The liquid ejection device, wherein the control unit is capable of controlling an amount of the liquid ejected from the head unit, and changes the mixture ratio in accordance with the amount of the liquid ejected.

6. The liquid ejection apparatus according to claim 4 , a liquid supply unit between the solvent reservoir and the head unit, the liquid supply unit supplying the solvent from the solvent reservoir to the head unit; The liquid ejecting apparatus according to claim 1, wherein the mixing section is provided between the liquid supply section and the head section.

7. 3. The liquid ejection apparatus according to claim 1, The head portion has at least one nozzle, The liquid ejecting apparatus according to claim 1, wherein the nozzle has a hole diameter of 0.01 mm or more and 0.15 mm or less.

8. 3. The liquid ejection apparatus according to claim 1, The liquid ejection device according to claim 1, wherein the amount of the liquid ejected from the head portion is equal to or greater than 1 mL / min and equal to or less than 25 mL / min.

9. 3. The liquid ejection apparatus according to claim 1, The liquid ejection device according to claim 1, wherein the ejection pressure of the liquid from the head portion is equal to or higher than 0.5 MPa and equal to or lower than 3.0 MPa.

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