JP7081244B2 - Liquid recovery device, liquid adhesion device, liquid recovery method for liquid recovery device, and liquid recovery program - Google Patents

Description

The present invention relates to a liquid recovery device, a liquid adhesion device, a liquid recovery method for the liquid recovery device, and a liquid recovery program.

In the inkjet type image forming apparatus, in order to remove the solvent and water such as the precoat coating agent and ink on the recording medium (printing medium), the above components on the recording medium are dried by a heat source such as a heater. Image formation on recording media is firmly established. The steam generated by drying does not settle on the recording medium and contains excess solvent and moisture, which may be harmful to the human body and the environment.Therefore, the dried steam is cooled and the solvent component is condensed. The technique of separating and recovering from the exhaust is already known.

Patent Document 1 discloses that an exhaust cooling mechanism for recovering a coating agent, a temperature sensor for monitoring the cooling temperature thereof, and a recovery device are provided in a dry exhaust duct to recover water and the coating agent. There is. Specifically, in this document, among the water vapor and the coating agent, the temperature is controlled to be lower than the dew condensation temperature of the coating agent calculated by using the pressure sensor in the dry exhaust duct and higher than the dew condensation temperature of the water vapor, and mainly only moisture. It is disclosed that the exhaust including the above is exhausted to the outside of the device.

However, in Patent Document 1, since the pressure sensor detects the atmospheric pressure in the flow path through which the high-temperature exhaust inside the recovery device passes, the temperature usage range cannot withstand the high temperature, and the sensor becomes expensive.

Further, since the dew condensation temperature of the liquid changes depending on the environmental pressure outside the apparatus, the separation accuracy of a plurality of components having different dew condensation temperatures may deteriorate.

Therefore, in view of the above circumstances, it is an object of the present invention to provide a liquid recovery device capable of appropriately separating and recovering a solvent from the exhaust gas without being affected by the atmospheric pressure of the installation environment.

In order to solve the above problems, the present invention has the following means.
In one aspect of the invention
A cooling unit that cools the steam containing the first component and the second component having a boiling point higher than that of the first component.
A barometric pressure sensor that detects the environmental barometric pressure outside the device,
A cooling control unit that controls the temperature of the cooling unit so that the temperature is such that the first component and the second component are liquefied based on the environmental pressure detected by the atmospheric pressure sensor.
A first recovery unit that collects and stores the first component and the second component in the steam liquefied by the controlled cooling unit.
A recovery liquid flow path through which the recovered liquid passes through the first recovery unit, and
A separate heating unit that heats the recovery liquid flow path,
A separate heating control unit that controls the temperature of the separate heating unit so that the temperature of the first component is evaporated and the temperature of the second component is not evaporated based on the environmental pressure detected by the atmospheric pressure sensor.
Provided is a liquid recovery device provided downstream of the recovery liquid flow path and comprising a second recovery unit for recovering and storing the second component after the first component has evaporated .

In another aspect of the invention
A cooling unit that cools the steam containing the first component and the second component having a boiling point higher than that of the first component.
A barometric pressure sensor that detects the environmental barometric pressure outside the device,
A cooling control unit that controls the temperature of the cooling unit so that the temperature is such that the first component and the second component are liquefied based on the environmental pressure detected by the air pressure sensor.
A first recovery unit that collects and stores the first component and the second component in the steam liquefied by the controlled cooling unit.
A recovery liquid flow path through which the recovered liquid passes through the first recovery unit, and
A second recovery unit provided downstream of the recovery liquid flow path,
The second recovery unit and the suction member provided in the space above the recovery liquid flow path are provided.
The adsorption member non-contactly adsorbs and recovers the first component from the liquid moving in the recovery liquid flow path and the liquid collected in the second recovery unit.
A liquid recovery device, provided.

According to one aspect, in the liquid recovery device, the solvent can be appropriately separated and recovered from the exhaust gas regardless of the installation environmental pressure.

The schematic diagram of the system including the image forming apparatus (liquid adhering apparatus) to which the liquid recovery apparatus of this invention is applied. FIG. 6 is a cross-sectional view of a liquid recovery device provided with a liquid recovery mechanism by exhaust cooling control using an atmospheric pressure sensor according to the first embodiment. FIG. 2 is a cross-sectional view of a liquid recovery mechanism provided with a secondary separation mechanism by heating control using an atmospheric pressure sensor according to a second embodiment. The graph which shows the vapor pressure curve of propylene glycol which is an example of a solvent component. The graph which shows the vapor pressure curve of trimethylene glycol which is another example of a solvent component. FIG. 3 is a cross-sectional view of a liquid recovery mechanism provided with a secondary separation mechanism by heating control using an atmospheric pressure sensor according to a third embodiment. FIG. 6 is a cross-sectional view of a liquid recovery mechanism using a natural cooling method according to a fourth embodiment. The control block diagram of the liquid recovery which concerns on embodiment of this invention. Overall schematic flow of temperature control using atmospheric pressure according to the embodiment of the present invention. Setting flow of solvent recovery control based on atmospheric pressure at the time of starting the image forming apparatus. Atmospheric pressure control setting process flow. Sub-flow of atmospheric pressure control reflection destination setting process. Sub-flow of the barometric pressure measurement cycle setting process. Sub-flow of atmospheric pressure measurement / reflection process.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In the following drawings, the same components may be designated by the same reference numerals and duplicate explanations may be omitted.

<Liquid adhesion device (system)>
First, the image forming system will be described with reference to FIG.

FIG. 1 is a schematic view of an image forming system including an image forming apparatus (liquid adhering apparatus, liquid applying apparatus) to which the liquid recovery apparatus of the present invention is applied. The image forming system 100 is, for example, a continuous book type inkjet printer.

The image forming system 100 includes a feeding unit 110, an image forming device 120, a paper reversing unit 130, an image forming device 140, and a paper collecting unit 150.

The paper feeding unit 110 supplies the recording medium 200 unwound by the unwinder 111 to the image forming apparatus 120. The recording medium 200 functions as a print medium, a print medium, or a web-like print medium on which ink droplets are ejected. For example, a continuous sheet such as roll paper, a long film, or the like may be used, and the ink may be used. It becomes an object to be attached.

The image forming apparatus 120 includes an image forming unit 121 provided with an ink head 122, a drying unit 123, and a paper drive roller 124. In the image forming unit 121, the ink head 122 ejects ink to one side of the recording medium 200 supplied and conveyed from the paper feeding unit 110.

The ink is an example of a liquid, for example, the liquid may be a water-based ink or an oil-based ink. Further, it may contain a dye or a pigment.

For example, when the ink is a water-based ink, pigment dispersions of each color (black, cyan, yellow, magenta), water-soluble organic solvents (functioning as moisturizers and penetrants), water, surfactants, antifungal agents, and defoamers. It is composed of components such as an agent and a pH adjuster.

The drying unit 123 dries the ink on the recording medium 200 printed by the image forming unit 121. By drying the ink on the recording medium 200, the water-soluble organic solvent and water evaporate, leaving the pigment dispersion and the surfactant of each color among the components of the ink.

The paper drive roller 124 conveys the recording medium 200. An image is printed in the image forming apparatus 120 by these components.

The paper reversing unit 130 reverses the recording medium 200 so that the surface opposite to the surface printed by the image forming apparatus 120 becomes the printing surface in the subsequent image forming apparatus 140.

The image forming apparatus 140 includes an image forming unit 141 provided with an ink head 142, a drying unit 143, and a paper drive roller 144, and has the same functions as the image forming apparatus 120, and is a recording medium 200. Of these, a print surface different from the print surface of the image forming apparatus 120 is printed.

The paper collection unit 150 winds up and collects the printed recording medium 200 by the rewinder 151.

In addition to these configurations, an ink fixability may be improved by applying a precoat coating before printing, and a precoat device (pretreatment liquid coating device) capable of expanding the types of printable recording media may be provided. .. Further, if the drying flow in the drying unit 123 after printing is insufficient depending on the type of ink or recording medium, a drying device for supplementing the drying performance is separately provided after the image forming devices 120 and 140 in the image forming system. You may do it.

In FIG. 1, the drying units 123 and 143 provided in the image forming devices 120 and 140 function as a liquid recovery device for recovering the liquid evaporated from the paper by drying. The image forming units 121 and 141 function as liquid adhering parts for ejecting ink (liquid) to the recording medium 200 which is an object. The image forming devices 120 and 140 having an image forming section (liquid adhering section) and a drying section (liquid collecting device) function as a liquid adhering device.

Further, when the pretreatment liquid is applied and a drying portion for the pretreatment liquid is provided, the drying portion for the pretreatment liquid functions as a liquid recovery device for recovering the liquid evaporated from the object by drying. The post-treatment liquid application device functions as a liquid adhering portion. A pretreatment liquid applying and drying device having a post-treatment liquid applying device and a post-treatment liquid drying unit can function as a liquid adhering device.

Similarly, when the post-treatment liquid is applied and a drying portion for the post-treatment liquid is provided, the drying portion for the post-treatment liquid functions as a liquid recovery device for recovering the liquid evaporated from the object by drying. The post-treatment liquid applying portion functions as a liquid adhering portion for discharging the post-treatment liquid (liquid) to the object. A post-treatment liquid application drying device having a post-treatment liquid application unit (liquid adhesion portion) and a post-treatment liquid drying unit (liquid recovery device) can function as a liquid adhesion device.

Further, in FIGS. 1 to 3, 6 and 7, X indicates the transport direction of the recording medium 200, Y indicates the depth direction, and Z indicates the height direction.

<Liquid recovery device: 1st embodiment>
Next, with reference to FIG. 2, the exhaust gas and the solvent recovery in the liquid recovery device, which is the drying portion of FIG. 1, will be described. FIG. 2 is a cross-sectional view of a liquid recovery device 1 provided with a liquid recovery mechanism by exhaust cooling control using an atmospheric pressure sensor according to the first embodiment.

For example, the liquid recovery device shown in FIG. 2 is applied to the drying unit 123 provided in the subsequent stage of the image forming unit 121 in the image forming apparatus 120 in FIG. Alternatively, it may be applied to a drying portion for drying the treatment liquid after the application of the pretreatment liquid which is the pre-process or the post-treatment liquid which is the post-process.

The liquid recovery device (solvent recovery device) 1 shown in FIG. 2 includes a drying mechanism 10 and a liquid recovery mechanism 20.

The drying mechanism 10 includes an external suction fan 11, an object drying heater 12, an object heating unit temperature sensor 13, a transfer belt 14, a transfer belt drive motor 15, and an object heating control unit 16.

The liquid recovery mechanism 20 includes a dry exhaust fan 21, a steam flow path 22, a solvent recovery unit 23, a cooling unit 24, a cooling unit temperature sensor 25, a cooling control unit 26, and an external exhaust fan 27. In the liquid recovery mechanism 20, the inner wall portion constituting the vapor flow path 22 and the solvent recovery unit 23 functions as an exhaust duct.

Further, an atmospheric pressure sensor 3 is provided on the outside of the housing 2 of the liquid recovery device 1. An intake port and an exhaust port are formed in the housing 2 of the liquid recovery device 1, an external suction fan 11 is provided at the intake port, and an external exhaust fan 27 is provided at the exhaust port.

In the drying mechanism 10, the printing / coating recording medium 200 is conveyed to the position of the drying section 123 (143) shown in FIG. 1 by the conveying belt 14 driven by the conveying belt drive motor 15.

In the drying mechanism 10, the solvent and moisture contained in the ink on the recording medium 200 are dried and evaporated by raising the temperature on the transport path by the transport belt 14 by the object drying heater 12. The object heating unit temperature sensor 13 is provided on the transport belt 14, and the object heating unit 16 appropriately controls the drying temperature based on the temperature value of the object heating unit temperature sensor 13 to control the object heating unit. The object drying heater 12 is driven.

In the drying mechanism 10, the solvent and moisture contained in the ink on the recording medium 200 come into contact with the external air FA sucked by the external suction fan 11 and are ventilated by the drying exhaust fan 21 from the recording medium 200. It actively evaporates as dry steam V1. Then, the dry steam V1 evaporated from the recording medium 200 is sucked by the dry exhaust fan 21 together with the external air FA that has entered the inside of the apparatus, so that the dry steam V1 is sucked from the upper part of the transport belt 14 toward the steam flow path 22 of the exhaust duct. It is exhausted to.

In this example, the dry exhaust fan 21 creates a flow of air to be sucked, so that the dry steam V1 is moved from the conveyor belt to the steam flow path 22 and exhausted. The dry steam V1 may be exhausted by blowing an air knife from the side opposite to the direction.

In the liquid recovery mechanism 20, the dry exhaust V2 introduced into the steam flow path 22 passes through the cooling unit 24 and is exhausted to the outside from the external exhaust fan 27.

Specifically, the cooling unit 24 is appropriately temperature-controlled by the cooling unit 26 based on the temperature value of the cooling unit temperature sensor 25 and the atmospheric pressure value of the atmospheric pressure sensor 3 that measures the external pressure. For example, the cooling unit 24 of the present embodiment has an electronic cooling element (Pelche element), and by adjusting the amount of current flowing through the electronic cooling element, the heat absorption amount of the electronic cooling element in the cooling unit 24 is adjusted. The temperature of the cooling unit 24 is controlled.

The dry exhaust V2 in contact with the temperature-controlled cooling unit 24 is dew-condensed and separated from the exhaust by liquefying both the solvent and water. The mixed liquid component of the condensed solvent and water is dropped into the exhaust duct which is the internal region of the liquid recovery mechanism 20, and then separated as the mixed recovery liquid S in the solvent recovery unit 23 provided in the lower part of the exhaust duct.

The mixed recovery liquid S may have a structure separate from the liquid recovery device 1 by forming a tank structure or the like that can be removed from the liquid recovery device 1 (drying unit 123) so that the user can appropriately dispose of it.

As the first control in the present embodiment, the cooling control unit 26 has a plurality of solvent components and water in the dry exhaust V2 based on the environmental pressure detected by the atmospheric pressure sensor 3 and the temperature values of the cooling unit temperature sensor 25. The temperature of the cooling unit 24 is controlled so that the temperature becomes such that the temperature is liquefied. This control is used as the primary separation mechanism. In this case, the dry exhaust V2 contains a solvent component (second component) and water (first component).

In this control, the cooling unit 24 does not perform an isolation process for separately separating the liquefied solvent and water, but separately separates the solvent component and water from the dry exhaust V2. That is, the liquid is recovered by controlling the temperature below the dew condensation point of the component having the lowest dew condensation point among the plurality of contained components including water and cooling so that all the evaporated contained components can be recovered.

By recovering the solvent in the cooling unit 24 by the above control, the dry exhaust V2 is discharged to the outside of the machine as an external exhaust EA through the external exhaust fan 27 without containing the solvent component harmful to the human body and the environment. Is possible.

At this time, if there is a possibility that a component that cannot be removed is unavoidably contained in the external exhaust, a system configuration may be configured in which a filter-type separation mechanism is interposed separately from the solvent recovery unit 23 to exhaust the external exhaust.

Alternatively, as a second control using the same configuration, the cooling control unit 26 may use a plurality of solvents in the dry exhaust V2 based on the environmental pressure detected by the atmospheric pressure sensor 3 and the temperature values of the cooling unit temperature sensor 25. The temperature of the cooling unit 24 may be controlled so as to liquefy the component (second component) and not liquefy the water (first component). In this control, water having a low boiling point is used as a first component, and a solvent having a high boiling point is used as a second component. Also in this example, when there is a possibility that an irremovable component is unavoidably contained in the external exhaust, the system configuration may be such that the external exhaust is provided by interposing a filter type separation mechanism separately from the solvent recovery unit 23.

As described above, in the present embodiment of the present invention, the temperature of the cooling unit 24 is set so that the cooling unit 24 liquefies only the water and the solvent component or the solvent component based on the environmental pressure detected by the atmospheric pressure sensor 3. In order to control it, it is possible to appropriately adjust the change in the boiling point of the solvent component due to the change in atmospheric pressure. Therefore, even if the dew condensation temperature of the liquid changes due to the environmental pressure outside the device, the solvent can be appropriately separated and recovered from the exhaust gas without being affected by the installation environmental pressure.

Further, in the present embodiment, the temperature control by the atmospheric pressure sensor 3 is preferably used not only for the cooling unit 24 in the solvent recovery but also for the use of the object drying heater 12 in the drying process. That is, the object heating control unit 16 controls the temperature of the object drying heater 12, which is the object heating unit, based on the environmental pressure detected by the atmospheric pressure sensor 3.

In the conventional drying process with constant temperature control, the boiling point rises when the atmospheric pressure rises due to the change in the boiling point of the solvent component due to the atmospheric pressure fluctuation, and the ink drying / evaporation on the recording medium becomes insufficient. This may lead to image defects such as ink adhesion and peeling in the subsequent process. On the other hand, when the atmospheric pressure decreases, the boiling point decreases and the drying temperature is set excessively, which causes yellowing and burning of the recording medium due to excessive drying, excessive paper shrinkage, and the like.

On the other hand, in the embodiment of the present invention, since the drying temperature of the object drying heater 12 is controlled based on the measured environmental atmospheric pressure, insufficient drying occurs when the atmospheric pressure fluctuates due to the drying control at a constant temperature. Image defects induced by excessive drying can be prevented.

In the above embodiment, the solvent recovery mechanism (primary separation mechanism) in which the solvent is recovered by cooling has been described, but in addition to the configuration of FIG. 2, only the solvent component is separated by evaporating water from the recovery solution. , A secondary separation mechanism for recovery may be added.

<Second Embodiment>
FIG. 3 is a cross-sectional view of a liquid recovery mechanism provided with a secondary separation mechanism by heating control using an atmospheric pressure sensor according to a second embodiment.

The liquid recovery mechanism 20A of FIG. 3 includes a secondary separation and recovery mechanism 30 including a separation heating heater 33, a secondary recovery unit 36, a steam exhaust fan 37, and the like, in addition to the configuration of the primary separation mechanism of FIG. The secondary separation and recovery mechanism 30 has a secondary separation function of separating and recovering only the solvent component by evaporating water from the recovery solution.

In the first control of the first embodiment, the mixed recovery liquid S of the solvent recovered by the cooling unit 24 and water was discarded as a waste solution, but in the present embodiment, the solvent from which the water is removed from the mixed liquid is disposed of. Since only the components are discarded, it is possible to operate the image forming apparatus by reducing the constant amount of waste liquid.

Specifically, in the secondary separation / recovery mechanism 30 of the liquid recovery mechanism 20A of the present embodiment, the mixed recovery liquid S1 submerged and stored in the first solvent recovery unit 23A is drained when a certain amount of liquid is reached. By opening the valve 31, it moves to the secondary recovery unit (second collection unit) 36.

In the flow path from the drain valve 31 to the secondary recovery unit 36, a separation heating heater 33 for separating only the water component from the mixed recovery liquid S1 is provided. The temperature of the separation heating heater 33 is measured by the separation heating unit temperature sensor 34. The heating temperature of the separation heating heater 33 is controlled by the separation heating control unit 35 according to the reading value of the temperature sensor 34 and the barometric pressure sensor 3. The separation heating heater 33, the separation heating unit temperature sensor 34, and the separation heating control unit 35 function as a second solvent separation mechanism.

By passing the mixed recovery liquid S1 through the recovery liquid flow path 32 heated by the separation heating heater 33, only the water content is evaporated from the mixed recovery liquid S1. Then, the steam W1 separated from the mixed recovery liquid S1 by evaporation is exhausted to the outside of the machine by the steam exhaust fan 37.

On the other hand, the mixed recovery solution S1 separated by the steam W1 by evaporation is dropped as it is and stored in the secondary recovery unit 36 as the separation recovery solution S2.

The secondary separation mechanism (second solvent recovery mechanism) 30 of the present embodiment is compared with the mixed recovery liquid S dew condensation / separation by the first solvent recovery mechanism using the first control of the first embodiment. The separated and recovered solution S2 from which the water vapor content has been removed by evaporating the water vapor W1 is less discarded as a waste solvent. Therefore, it is possible to reduce the number of processes for the user to dispose of waste liquid by maintenance, which leads to more efficient operation of the image forming apparatus.

At this time, regarding the control of the separation heating heater 33 that removes the water vapor W1 from the mixed recovery liquid S, it is more preferable to control the temperature based on the reading value of the atmospheric pressure sensor 3 provided outside the machine. That is, in the present embodiment, the separation heating control unit 35 controls the temperature of the separation heating heater 33, which is the separation heating unit, based on the environmental pressure detected by the atmospheric pressure sensor 3.

In the conventional separation and recovery mechanism inside the exhaust duct that does not reflect the atmospheric pressure in the temperature, the correlation between the exhaust pressure inside the duct and the atmospheric pressure outside the machine is unclear, and the separation of multiple components with different dew condensation temperatures The accuracy gets worse.

On the other hand, in the present embodiment, the first solvent recovery mechanism by the cooling unit 24 capable of recovering the contained solvent in a single layer and the mixed recovery liquid S1 recovered by the first solvent recovery mechanism are further separated and recovered. It is provided with a next separation mechanism (second solvent recovery mechanism) 30. Therefore, without implementing an unstable single separation mechanism in the exhaust duct, the second solvent recovery mechanism, which is static and low temperature compared to the inside of the exhaust duct, controls heating at the separation temperature according to the atmospheric pressure. .. By this control, water (first component) is efficiently evaporated and separated from the exhaust regardless of the installation environmental pressure of the liquid recovery device 1, and the solvent component (second component) having a boiling point higher than that of water is used. Ingredients) can be properly recovered.

In addition, if a pressure sensor is installed in the flow path through which high-temperature exhaust passes, the temperature range of the barometric pressure sensor must be able to withstand high temperatures, and maintenance or replacement due to solvent adhesion is required. However, in the configuration of the present invention, the pressure sensor is provided outside the device. Therefore, in the configuration of the present invention, since the temperature usage range of the pressure sensor is sufficient at the outside air temperature, it is not necessary to install an expensive pressure sensor, and maintenance due to solvent adhesion is also unnecessary.

Here, FIGS. 4 and 5 show vapor pressure curves of typical ink solvents. Specifically, FIG. 4 is a vapor pressure curve of propylene glycol, and FIG. 5 is a vapor pressure curve of trimethylene glycol. (Source: Quoted from Kobe Sea Disaster Prevention Study Group HP) In FIGS. 4 and 5, the horizontal axis shows the temperature of the solvent and the vertical axis shows the vapor pressure.

Here, at standard atmospheric pressure 1 atm = 101.33 kPa, the boiling points of both propylene glycol and trimethylene glycol are close to 200 ° C. under atmospheric pressure from the vapor pressure curves of the above two typical ink-containing solvents.

Therefore, when the solvent and water shown in FIG. 4 or FIG. 5 are contained in the ink, the temperature control is performed as follows.

In the evaporation heating control of the recording medium, the object drying heater 12 evaporates the solvent and water of the ink on the recording medium 200, and in the object heating control unit 16, the recording medium 200 heated at the heating temperature is used. Adjust and set so that it is higher than the boiling point of the solvent at the measured atmospheric pressure (for example, 200 ° C.).

Further, in the first control of the configuration of FIG. 2 and the cooling control of the embodiment shown in FIG. 3, since all the solvent composed of the solvent and water is set to be liquefied, the cooling control unit 26 is forced to cool at the cooling temperature. The cooled recording medium 200 is adjusted and set to be lower than the boiling point of water (for example, 100 ° C.) at the measured atmospheric pressure.

Alternatively, in the cooling control in the case of performing the second control of the configuration of FIG. 2, since only the solvent is set to be liquefied, the cooling control unit 26 measures the steam V2 forcibly cooled at the cooling temperature. The temperature is adjusted and set so as to be higher than the boiling point of water (for example, 100 ° C.) and lower than the boiling point of solvent (for example, 188.2 ° C. or 204 ° C.) at the atmospheric pressure.

Further, in the separation heating control having the configuration of FIG. 3, in the separation heating control unit 35, the mixed liquid heated at the heating temperature is equal to or higher than the boiling point of water (for example, 100 ° C.) at the measured atmospheric pressure and the boiling point of the solvent. Adjust and set so that it is smaller than (for example, 188.2 ° C or 204 ° C).

Here, as can be seen from the vapor pressure curves of the ink-containing solvent shown in FIGS. 4 and 5, the boiling points of propylene glycol and trimethylene glycol constituting the solvent are close to 200 ° C. under atmospheric pressure, so that the boiling point of water ( For example, there is a clear difference from 100 ° C.). Therefore, in the steam separation process in the second separation / recovery mechanism in FIG. 3, water that reaches the boiling point at about 100 ° C. is separated by the separation heating heater 33, and then these solvent components are separated and recovered in the second recovery mechanism. , Disposal can be done.

<Third Embodiment>
FIG. 6 is a cross-sectional view of a liquid recovery mechanism provided with a secondary separation mechanism by heating control using an atmospheric pressure sensor according to a third embodiment.

In the above embodiment shown in FIG. 3, in order to reduce the amount of discarded mixed recovery liquid recovered, water is removed by steam W1 by heating, but in this embodiment, water is separated from the recovered mixed recovery liquid. In order to do so, water is removed using an adsorption member.

In the present embodiment, the suction member 38, the suction member heating heater 33B, the secondary recovery unit 36, and the like are provided as the secondary separation and recovery mechanism 30B.

In the present embodiment, the adsorption member 38 is provided in the space above the secondary recovery unit (second recovery unit) 36 and the recovery liquid flow path 32. The adsorption member 38 adsorbs moisture (first component) in the atmosphere when the mixed recovery liquid moves through the recovery liquid flow path 32. Further, the adsorption member 38 adsorbs water from the liquid recovered in the secondary recovery unit 36 in addition to the liquid (mixed recovery liquid) moving in the recovery liquid flow path 32, so that the secondary recovery unit 36 receives water. The recovered solvent S0 remains. The adsorption member 38 is, for example, a dehumidifying agent such as silica gel, and is a member capable of selectively removing water.

The adsorption member heating heater (adsorption member heating unit) 33B heats the adsorption member 38 at a temperature at which water is evaporated.

Then, the steam W1 separated from the adsorption member 38 by evaporation is exhausted to the outside of the machine from the steam exhaust fan 37 as in the second embodiment.

In the liquid recovery mechanism 10B of the present embodiment, the adsorption member 38 selectively adsorbs water from the liquid moving in the recovery liquid flow path 32 and the liquid recovered by the secondary recovery unit 36. By this control, moisture (first component) is efficiently adsorbed and separated from the moving liquid regardless of the installation environmental pressure of the liquid recovery device 1, and the solvent component (second component) that the adsorbing member does not adsorb is used. The component) can be appropriately recovered by the secondary recovery unit 36.

<Fourth Embodiment>
In the above embodiment, an example in which steam is forcibly cooled by a cooling unit whose temperature is controlled is shown, but when the dry exhaust is sufficiently cooled by the outside air and the solvent can be recovered, the cooling unit 24 is omitted and the exhaust duct is used. It may be configured to perform natural cooling using the contact surface with the external environment by meandering or the like.

The solvent recovery mechanism using the natural cooling method will be described. FIG. 7 is a cross-sectional view of a liquid recovery mechanism using the natural cooling method according to the fourth embodiment. In the configuration of FIG. 7, instead of the cooling unit 24 of the first solvent recovery mechanism, a plurality of natural cooling units and a plurality of recovery units are provided in the exhaust duct on the bellows. The shape of the steam flow path constituting the natural cooling portion is not limited to the shape bent in a bellows shape, and may be a shape that detours along the inner wall, for example.

As shown in FIG. 7, the natural cooling units 28x, 28y, 28z are steam flow paths meandering so as to come into contact with the outside air. At the bottom of each of the natural cooling units 28x, 28y, 28z, there is a collection unit 23x, which collects and stores the solvent and water that have dewed, separated, and dropped due to natural cooling from the outside air environment as mixed recovery liquids Sx, Sy, Sz. 23y and 23z are provided. That is, in the present embodiment, the cooling unit is composed of natural cooling units 28x, 28y, 28z.

In the present embodiment, the dry exhaust V2 flowing into the exhaust duct from the drying mechanism 10 passes through a plurality of natural cooling portions 28x, 28y, 28z in the exhaust duct exposed to the outside of the machine, and is outside the machine from the external exhaust fan 27C. Is exhausted to. Specifically, the dry exhaust V2 is gradually cooled by passing through a plurality of natural cooling portions 28x, 28y, 28z, and the solvent and moisture are gradually condensed from V3 to V4 to be separated and exhausted as the external exhaust AE1. To.

On the other hand, the mixed recovery liquids Sx, Sy, Sz separated by evaporation of the dry vapors V3 and V4 in the natural cooling units 28x, 28y and 28z are dropped as they are and recovered to the solvent recovery units 23x, 23y and 23z. The mixed recovery liquids Sx, Sy, and Sz recovered by the solvent recovery units 23x, 23y, and 23z are moved to the secondary separation and recovery mechanism 30C, which is the second solvent recovery mechanism, through the recovery liquid pipe 29, and the secondary separation and recovery mechanism 30C. Separates the solvent and water.

Further, as the first separation / recovery mechanism, both cooling by temperature control by the cooling unit 24 and cooling by natural cooling in the exhaust duct may be used in combination. For example, when the external environmental temperature is a low temperature at which the dry exhaust in the exhaust duct can be cooled sufficiently, the cooling control by the cooling unit 24 is not performed, and the solvent is recovered by natural cooling as the first separation recovery mechanism. .. On the other hand, when the outside air temperature is so high that a shortage is recognized in the exhaust cooling, the solvent is recovered by performing forced cooling by the cooling unit 24 instead of the solvent recovery by natural cooling.

Regardless of whether or not the solvent recovery control by forced cooling using the cooling unit 24 is implemented, by introducing the exhaust duct method based on the natural cooling method as in the present embodiment, dew condensation in the exhaust duct can be prevented. It is possible to prevent and collect as a whole.

Furthermore, the bottom 22B1, 288B 1, 28B2 of the flow path through which steam passes so as to drip into the recovery section 23x to 23z at the bottom of the exhaust duct has an inclined structure to prevent corrosion of the exhaust duct and reduce maintenance. can do.

Further, in the embodiment shown in FIG. 7, an example in which the secondary separation / recovery mechanism 30C of the liquid separation heating method similar to that in FIG. 3 is applied as the secondary separation mechanism in the liquid recovery mechanism 20C is shown, but natural cooling is performed. The primary separation mechanism used may be combined with a shape similar to the secondary separation / recovery mechanism 30B of the adsorption separation method using an adsorption member as shown in FIG.

<Control block>
FIG. 8 is a control block diagram of drying and liquid recovery using atmospheric pressure in a system including a liquid recovery device. In this example, an example is shown in which the liquid recovery device is the drying unit 123 of the image forming device 120 of FIG.

In this example, a user operation unit 50 provided separately from the image forming apparatus 120 is connected to the image forming apparatus 120. The user operation unit 50 includes a user operation I / F 51 and a display unit 52. The display unit 52 displays information to the user. The user operation I / F 51 is operated by the user and communicates with the communication I / F 46 of the image forming apparatus 120.

The image forming apparatus 120 is provided with a drying unit 123 and a control board 40. The control board 40 controls the cooling / heating unit (object drying heater 12, cooling unit 24, separation heating heater 33) of the drying unit 123, which is the liquid recovery device 1, based on the atmospheric pressure reading by the atmospheric pressure sensor 3. ..

The control board 40 has a computer function in which a temperature control program capable of executing a liquid recovery method accompanied by temperature adjustment using the barometric pressure sensor of the present invention is installed in advance. For example, this liquid recovery program may be made applicable by a CD-ROM or the like, or may be distributed by a telecommunication line such as the Internet.

The control board 40 communicates with a CPU (Central Processing Unit) 41, a ROM (Read Only Memory) 42, a RAM (Random Access Memory) 43, a control I / F (Interface) 44, and a sensor I / F 45. An I / F 46 is provided.

The CPU 41 calculates various flows. The ROM 42 is connected to the CPU 41 by a parallel bus, and stores calculation parameters and individual parameters of various ink / solvent types. The RAM 43 is used as an operating calculation area of the CPU 41.

The control I / F 44 drives the cooling / heating units 12, 24, 33. The sensor I / F 45 is in charge of communication between the atmospheric pressure sensor 3 (4) that measures the external environmental atmospheric pressure and the temperature sensors 13, 25, 34 that monitor the temperature of the cooling / heating units 12, 24, 33.

The communication I / F 46 communicates with other boards (such as an image forming board) in the image forming device 120 other than the control board 40, an external board in the device, and communication with the user operation unit 50.

When the user or the person in charge of maintenance changes the control target temperature based on the change of ink or solvent by using the display unit 52 of the user operation unit 50 or the user operation I / F 51, the input information is used as the control board 40. It is stored in the internal ROM 42 and read out when the control target calculation flow is executed by the CPU 41.

FIG. 8 shows an example in which the CPU 41 collectively controls the temperatures of the cooling / heating units 12, 24, 33 of the liquid recovery device 1, but the above-mentioned FIGS. 2, 3, 6, and 7 show the above-mentioned FIGS. As shown, the object heating control unit 16, the cooling control unit 26, and the separation heating control unit 35 of the liquid recovery device may be individually controlled by providing a substrate corresponding to the control substrate 40. Alternatively, the cooling / heating units 12, 24, and 33 may be configured to be simultaneously monitored and controlled at a plurality of locations.

Further, the ROM 42 and the RAM 43 may not be mounted as independent devices but may be included in the internal circuit of the CPU 41.

<Outline of control>
FIG. 9 is an overall schematic flow of temperature control using atmospheric pressure in the embodiment of the present invention.

First, the flow is started when the power is turned on (START).

In step S1 (hereinafter, simply referred to as S), the startup setting is performed. At the start-up setting, the atmospheric pressure is measured, the CPU 41 or the object heating control unit 16 sets the recording medium heating temperature, and the CPU 41 or the cooling control unit 26 sets the cooling temperature based on the measured atmospheric pressure. The CPU 41 or the separation heating control unit 35 can set the separation heating temperature. Details will be described with reference to FIGS. 10, 13, and 14.

When the start-up setting is completed, the print JOB is started in S2, and it is determined whether to perform the inter-JOB measurement in S3, that is, whether to perform the atmospheric pressure measurement between the print JOB and the next print JOB. ..

When the measurement between JOBs is carried out in S3 (Yes), the atmospheric pressure sensor 3 measures the atmospheric pressure (environmental pressure) in S4. When the atmospheric pressure is measured between the printing JOBs, in the subsequent control, the recording medium heating temperature, the cooling temperature, and the separation heating temperature are set (updated) according to the measured atmospheric pressure. Details will be described with reference to FIG.

Then, the print JOB is started in S5.

If it is predicted that the paper will reach the space in S6, whether to perform the paper-to-paper measurement in S7, that is, whether to perform the atmospheric pressure measurement in the period between the recording medium and the next recording medium. to decide.

Then, when the paper-to-paper measurement is carried out in S7 (Yes), the atmospheric pressure sensor 3 carries out the atmospheric pressure measurement in S8.

The arrival of the paper space in S6 to the atmospheric pressure measurement in S8 are repeated every time the paper space is reached until the printing JOB is completed in S9.

When the atmospheric pressure is measured between papers, the recording medium heating temperature, cooling temperature, and separation heating temperature are set (updated) according to the measured atmospheric pressure in the subsequent control. Details will be described with reference to FIG.

When the printing JOB is completed (S9), it is determined whether the power can be turned off (S10).
If the power is not turned off, the process waits until the next print JOB starts (Yes in S2).

If the power can be turned off, the flow ends (END).

<Setting flow>
FIG. 10 is a diagram illustrating a setting flow of solvent recovery control based on atmospheric pressure at the time of starting the image forming apparatus. FIG. 10 corresponds to the detailed flow in the startup setting of S1 in FIG.

When the image forming apparatus 120 starts the start-up setting at the same time when the power is turned on, the flow of FIG. 10 is executed in a series of flows. First, the temperature control process in the cooling unit 24 or the heating units 12 and 33 by the atmospheric pressure sensor 3 is carried out (S11). Details of S11 will be described with reference to FIG.

After that, in S12, it is determined whether or not to measure the atmospheric pressure at the time of starting. Specifically, the condition determination as to whether or not the execution flag of the atmospheric pressure measurement at the time of activation is generated is performed in the subflow of S11.

In the case of flag generation (YES in S12), in S13, the atmospheric pressure sensor 3 is made to measure the atmospheric pressure, and based on the reading value (atmospheric pressure, environmental pressure) of the atmospheric pressure sensor 3, the heating units 12, 33 and The target temperature value for temperature control is set as a parameter by reflecting it on the temperature of the cooling unit 24. Details of S13 will be described with reference to FIG.

When the flag is not generated (NO in S12), S13 for measuring the atmospheric pressure is omitted, and the start-up setting in the control of the entire image forming apparatus is terminated.

Next, the sub-flow of the atmospheric pressure control setting in S11 of FIG. 10 will be described with reference to FIGS. 11 to 13.

FIG. 11 is a flow of the atmospheric pressure control setting process.
In the atmospheric pressure control setting process, in S101, the control reflection destination for setting whether or not the atmospheric pressure control is performed in each of the cooling unit 24 and the heating units 12 and 33 is set.

After that, in S102, the atmospheric pressure measurement cycle is set. Specifically, the execution cycle of the atmospheric pressure measurement included in the job process of the image forming apparatus 120 that executes the atmospheric pressure control process is set.

The details of the setting of the control reflection destination of S101 will be described with reference to FIG. 12, and the setting of the cycle of atmospheric pressure measurement of S102 will be described with reference to FIG.

FIG. 12 is a sub-flow of the atmospheric pressure control reflection destination setting process.
The control reflection destination setting process includes an atmospheric pressure control target determination step P1 of the heating unit and an atmospheric pressure control target determination step P2 of the cooling unit. The execution order of the two steps, the atmospheric pressure control target determination step P1 of the heating unit and the atmospheric pressure control target determination step P2 of the cooling unit, may be performed in any order by parallel processing.

In the atmospheric pressure control target determination step P1 of the heating unit, a control presence / absence flag is set for the control target of the heating unit (12, 33 and the heating unit in other image forming units) existing in the image forming apparatus (S201). ). It is determined whether the flag setting is completed for all the control targets targeting this (S202), and the process is repeated until the flag is set for all the targets (YES in S202).

Similarly, in the atmospheric pressure control target determination step P2 of the cooling unit, a flag for the presence or absence of control is set for the control target such as the cooling unit 24 existing in the image forming apparatus (S203). It is determined whether the flag setting is completed for all the control targets targeting this (S204), and the process is repeated until the flag is set for all the targets (YES in S204).

At this time, when the control target does not exist in either the heating unit or the cooling unit, for example, in the configuration of FIGS. 2 and 7, the atmospheric pressure control target determination step of the non-existent heating unit or the atmospheric pressure of the cooling unit The control target determination step may be omitted.

FIG. 13 is a sub-flow of the atmospheric pressure measurement cycle setting process.
The atmospheric pressure measurement cycle setting process defines the timing at which the atmospheric pressure detection control is performed in the operation of the image forming apparatus 120.

The execution timing of the atmospheric pressure measurement cycle setting process is, for example, T1 at startup after the power is turned on, T2 between printing JOBs, T3 between printing papers, and the like.

At each of the execution timings T1, T2, and T3, it is first determined whether or not to execute the atmospheric pressure measurement cycle interval (S301, S303, S306).

When the atmospheric pressure measurement interval is executed (YES in S301, S303, S306), the execution flag is generated (S302, S304, S307).

Then, in the printing JOBs T2 and the printing papers T3, the execution cycle (S305, S308) is set according to the interval at which the printing JOBs T2 and the printing papers T3 reach.

The setting procedure of T1, T2, and T3 does not matter for these processes, and may be executed by parallel processing.

By performing temperature correction control of the heating part and cooling part at appropriate intervals by the atmospheric pressure sensor, not only the pressure value due to the altitude that is potentially present in the installation environment of the image forming device but also the pressure due to changes over time such as weather changes. It is possible to control the temperature according to changes. Therefore, it is possible to carry out image formation while constantly executing an appropriate drying / cooling process.

FIG. 14 is a sub-flow of the atmospheric pressure measurement / reflection process. The flow of FIG. 14 corresponds to the details of the process of measuring the atmospheric pressure and reflecting the set temperature in S13 of FIG. Further, the flow of FIG. 14 is applied to the process of atmospheric pressure measurement of S1, S4 and S8 of FIG.

The atmospheric pressure measurement / reflection process includes a temperature setting step P3 of the heating unit and a temperature setting step P3 of the cooling unit. The execution order of the temperature setting step P3 of the heating unit and the temperature setting step P4 of the cooling unit may not be limited, and may be performed in any order by parallel processing.

First, in S401, the atmospheric pressure (environmental pressure) is measured by the atmospheric pressure sensor 3. Then, the control target temperatures of the heating units 12 and 33 and the cooling unit 24 are calculated (S402, 404) according to the reading value of the atmospheric pressure, and the parameters are saved (S403, S405).

At this time, after reading the atmospheric pressure sensor value (S401), the average atmospheric pressure value after a certain period of time may be adopted instead of the instantaneous atmospheric pressure value at the time of measurement for the parameter to be reflected in the calculation. With the above parameters, the control target temperature values of the heating units 12, 33 and the cooling units 24 are calculated (S402, S404) according to the type of ink used in the printing process and the solvent thereof, and stored as parameters.

For the above-mentioned inks and solvents, the user or manufacturer can select the type of ink to be mounted from the external operation unit IF according to the ink replacement / change, or use the ink identification means provided in the ink cartridge container. By automatically recognizing the mounting type according to the situation, the setting temperature calculation formula of the calculation flow for S402 and S404 may be changed according to the type of the mounting ink.

Also in this flow, when the control target does not exist in either the heating unit 12, 33 or the cooling unit 24, for example, in the configuration of FIGS. 2 and 5, the temperature setting step P3 of the non-existent heating unit or cooling is performed. The temperature setting step P4 of the unit may be omitted.

In addition, in FIGS. 12 and 14, the heating for the object and the heating for the secondary separation are collectively described as the heating unit, but the heating control of the object drying heater 12 and the heating control of the separation heating heater 33 are separately described. You may go to.

According to the above embodiment, in the liquid recovery device of the present invention, the solvent can be appropriately separated and recovered from the exhaust gas regardless of the installation environmental pressure.

Here, the "liquid adhering device" is a device provided with a liquid discharge head or a liquid discharge unit which is a liquid discharge unit, and drives the liquid discharge unit to discharge the liquid. This "liquid adhering device" can also include means related to feeding, transporting, and discharging paper to which a liquid can be adhered, as well as a pretreatment device, a posttreatment device, and the like.

For example, as a "liquid adhering device", in addition to an image forming device which is a device for ejecting ink to form an image on paper, powder is layered in order to form a three-dimensional model (three-dimensional model). Examples thereof include a three-dimensional modeling device (three-dimensional modeling device) that discharges a modeling liquid into the formed powder layer.

Further, the "liquid adhering device" is not limited to a device in which a significant image such as characters and figures is visualized by the discharged liquid. For example, those that form patterns that have no meaning in themselves and those that form a three-dimensional image are also included.

The above-mentioned "material to which a liquid can adhere" means a material to which a liquid can adhere at least temporarily, such as one that adheres and adheres, and one that adheres and permeates. Specific examples include paper, recording paper, recording paper, film, recorded media such as cloth, electronic substrates, electronic components such as piezoelectric elements, powder layers (powder layers), organ models, and media such as inspection cells. Yes, and unless otherwise specified, it includes everything to which the liquid adheres.

The material of the above-mentioned "material to which liquid can adhere" may be paper, thread, fiber, cloth, leather, metal, plastic, glass, wood, ceramics or the like as long as the liquid can adhere even temporarily.

Further, the "liquid" includes an ink, a treatment liquid, a DNA sample, a resist, a pattern material, a binder, a modeling liquid, or a solution containing amino acids, proteins and calcium, and a dispersion liquid.

Further, the "liquid adhering device" includes, but is not limited to, a device in which the liquid discharge head and the device to which the liquid can adhere move relatively. Specific examples include a serial type device that moves the liquid discharge head, a line type device that does not move the liquid discharge head, and the like.

In addition, as a "liquid adhering device", a treatment liquid coating device that discharges the treatment liquid onto the paper in order to apply the treatment liquid to the surface of the paper for the purpose of modifying the surface of the paper, and a solution of raw materials. There are injection granulators and the like that atomize fine particles of raw materials by injecting a composition liquid dispersed therein through a nozzle.

Further, in the terms of the present application, image formation, recording, printing, printing, printing, modeling, etc. are all synonymous.

Although the preferred embodiment of the present invention has been described in detail above, the present invention is not limited to the specific embodiment, and is within the scope of the gist of the embodiment of the present invention described in the claims. Various modifications and changes are possible.

1 Liquid recovery device 2 Housing 3 Atmospheric pressure sensor (barometric pressure sensor)
10 Drying mechanism 12 Object drying heater (object heating part)
13 Object heating unit temperature sensor (temperature sensor)
16 Object heating control unit 20, 20A, 20B, 20C Liquid recovery mechanism 23 Solvent recovery unit (recovery unit)
23x, 23y, 23z Solvent recovery unit (recovery unit)
23A First solvent recovery unit (first recovery unit)
24 Cooling unit 25 Cooling unit Temperature sensor (temperature sensor)
26, 26A, 26B Cooling control unit 28x, 28y, 28z Natural cooling unit 30, 30B, 30C Secondary separation and collection mechanism (second liquid recovery mechanism)
33 Separate heating heater (separate heating unit)
34 Separate heating unit temperature sensor (temperature sensor)
35 Separation heating control unit 35B Adsorption member Heating control unit 36 Second recovery unit 38 Adsorption member 40 Control board 120, 140 Image forming device (liquid adhesion device)
121,141 Image drawing part (liquid adhesion part)
123, 142 Drying part (liquid recovery device)

Japanese Unexamined Patent Publication No. 2005-144285

Claims (8)

A cooling unit that cools the steam containing the first component and the second component having a boiling point higher than that of the first component.
A barometric pressure sensor that detects the environmental barometric pressure outside the device,
A cooling control unit that controls the temperature of the cooling unit so that the temperature is such that the first component and the second component are liquefied based on the environmental pressure detected by the air pressure sensor.
A first recovery unit that collects and stores the first component and the second component in the steam liquefied by the controlled cooling unit.
A recovery liquid flow path through which the recovered liquid passes through the first recovery unit, and
A separate heating unit that heats the recovery liquid flow path,
A separate heating control unit that controls the temperature of the separate heating unit so that the temperature of the first component is evaporated and the temperature of the second component is not evaporated based on the environmental pressure detected by the atmospheric pressure sensor.
A liquid recovery device provided downstream of the recovery liquid flow path and comprising a second recovery unit for recovering and storing the second component after the first component has evaporated . A cooling unit that cools the steam containing the first component and the second component having a boiling point higher than that of the first component.
A barometric pressure sensor that detects the environmental barometric pressure outside the device,
A cooling control unit that controls the temperature of the cooling unit so that the temperature is such that the first component and the second component are liquefied based on the environmental pressure detected by the air pressure sensor.
A first recovery unit that collects and stores the first component and the second component in the steam liquefied by the controlled cooling unit.
A recovery liquid flow path through which the recovered liquid passes through the first recovery unit, and
A second recovery unit provided downstream of the recovery liquid flow path,
The second recovery unit and the suction member provided in the space above the recovery liquid flow path are provided.
The adsorption member is a liquid recovery device that non-contactly adsorbs and recovers the first component from the liquid moving in the recovery liquid flow path and the liquid collected in the second recovery unit. The cooling unit has an electronic cooling element and has an electronic cooling element.
The cooling control unit controls the temperature of the electronic cooling element of the cooling unit based on the environmental pressure detected by the atmospheric pressure sensor.
The liquid recovery device according to claim 1 or 2. An object heating unit that heats the liquid adhering to the object to generate the vapor, and
The liquid recovery device according to any one of claims 1 to 3 , further comprising an object heating control unit that controls the temperature of the object heating unit based on the environmental pressure detected by the atmospheric pressure sensor. A liquid attachment part that attaches a liquid to the object,
A liquid adhering device comprising the liquid recovery device according to claim 4 . The liquid adhering device according to claim 5 , wherein the measurement of the environmental air pressure by the barometric pressure sensor is performed at a timing after turning on the power of the liquid adhering device and before the start of the liquid adhering operation. It is a liquid recovery method for liquid recovery equipment.
The step that the barometric pressure sensor detects the environmental barometric pressure outside the device,
A step of controlling the cooling temperature based on the environmental pressure detected by the atmospheric pressure sensor,
At a cooling temperature at which the cooling unit liquefies the steam containing the first component and the second component having a boiling point higher than that of the first component, in a controlled manner of the first component and the second component. , Cooling steps and
A step in which the first recovery unit recovers the first component and the second component in the steam,
A step of controlling the separation heating temperature based on the environmental pressure detected by the atmospheric pressure sensor, and
The separation heating unit heats the recovery liquid flow path through which the liquid recovered in the first recovery unit passes at a separation heating temperature at which the controlled first component is evaporated and the second component is not evaporated . Steps to do and
A liquid recovery method in which a second recovery unit provided downstream of the recovery liquid flow path has a step of recovering the second component after the first component has evaporated . On the computer
Detection processing that causes the barometric pressure sensor to detect the environmental barometric pressure outside the device,
Cooling control processing that controls the cooling temperature based on the environmental pressure detected by the atmospheric pressure sensor,
At a cooling temperature at which the steam containing the first component and the second component having a boiling point higher than that of the first component is liquefied in the cooling unit at the controlled first component and the second component. , Cooling process to cool,
A primary recovery process for causing the first recovery unit to recover the first component and the second component in the steam,
A heating control process that controls the separation heating temperature based on the environmental pressure detected by the atmospheric pressure sensor, and
The recovery liquid flow path through which the liquid recovered in the first recovery section passes is heated in the separation heating section at a separation heating temperature at which the controlled first component is evaporated and the second component is not evaporated. Separation heat treatment and
A liquid recovery program for executing a secondary recovery process of recovering the second component after the first component has evaporated in a second recovery section provided downstream of the recovery liquid flow path .

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