JP2012116179A - Inkjet recording apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress curling of paper.SOLUTION: An inkjet recording apparatus includes a storage part to store a recording medium, an image forming part that forms an image by ejecting an aqueous ink to the recording medium conveyed from the storage part, a separation part that includes a slit to allow the recording medium to pass from the storage part to the image forming part, and an opening and closing part to open and close the slit, and separates the storage part and the image forming part, a detection part to detect conveyance of the recording medium from the storage part to the image forming part, and a control part to control opening and closing of the opening and closing part in accordance with a detection result of the detection part.

Description

  Embodiments described herein relate generally to an ink jet recording apparatus.

  In recent years, coated paper for exclusive use in inkjet printing has been frequently printed on plain paper because of its high cost and lack of writing performance. However, when printing on plain paper with water-based inkjet ink, curling occurs due to swelling of paper fibers due to moisture in the ink. In particular, curls remaining after a few days cause problems such as loss of image quality as printed matter.

JP 2008-23823 A

  The problem to be solved by the present invention is to suppress curling of paper.

  In order to solve the above problems, an ink jet recording apparatus according to an embodiment of the present invention includes a storage unit that stores a recording medium, and an image that forms an image by ejecting aqueous ink onto the recording medium conveyed from the storage unit. A separation unit that separates the storage unit and the image forming unit, and a storage unit that includes a forming unit, a slit that allows the recording medium to pass from the storage unit to the image forming unit, and an opening / closing unit that opens and closes the slit. A detection unit that detects conveyance of the recording medium from the image forming unit to the image forming unit, and a control unit that controls to open and close the opening / closing unit according to a detection result of the detection unit.

It is side surface sectional drawing of the inkjet recording device in 1st embodiment. It is an enlarged view of an ink jet head, an ink cartridge, and a tube in a first embodiment. 1 is a block diagram of an ink jet recording apparatus according to a first embodiment. It is a figure which shows the isolation | separation part of the state which the opening-and-closing part in 1st embodiment closed. It is a flowchart of opening and closing of the opening-and-closing part in 1st embodiment. It is a figure which shows the isolation | separation part of the state in which the opening-and-closing part in 1st embodiment opened. It is a figure which shows the passage of time and the curl amount of the paper in the first embodiment. It is a figure which shows the curled paper in 1st embodiment. It is an enlarged view of the isolation | separation part in 2nd embodiment. It is side surface sectional drawing of the isolation | separation part in 2nd embodiment. It is a figure which shows the isolation | separation part which the opening-and-closing part closed in 3rd embodiment. It is a figure which shows the isolation | separation part which the opening-and-closing part opened in 3rd embodiment.

  Embodiments of an ink jet recording apparatus will be described below with reference to the accompanying drawings.

(First embodiment)
FIG. 1 is a side sectional view of the ink jet recording apparatus 1. The ink jet recording apparatus 1 includes an image forming unit 2, a storage unit 3, and a separation unit 4.

  The image forming unit 2 forms an image on the surface of the paper P by ejecting water-based ink. The image forming unit 2 includes an inkjet head 115, an ink cartridge 116, and a tube 118.

  The storage unit 3 includes paper cassettes 100 and 101 and a dehumidifying unit 150. The paper cassettes 100 and 101 hold the paper P and can be pulled out in the front direction of FIG. The dehumidifying unit 150 is a dehumidifying agent such as silica gel, and reduces the humidity of the storage unit 3 to dry the paper P stored in the paper cassettes 100 and 101. The dehumidifying unit 150 lowers the humidity of the storage unit 3 below the humidity of the image forming unit 2. The humidity of the storage unit 3 is preferably lower than the humidity of the outside air of the inkjet recording apparatus 1.

  The separation unit 4 separates the storage unit 3 from the image forming unit 2 and prevents moisture from the image forming unit 2 from flowing into the storage unit 3. The separation unit 4 is defined as serving as the lower surface of the image forming unit 2 or the upper surface of the storage unit 3, or the lower surface of the image forming unit 2 and the upper surface of the storage unit 3. In the first embodiment, the image forming unit 2 and the storage unit 3 included in the ink jet recording apparatus 1 that is one housing are separated by the separating unit 4, but the present invention is not limited thereto. The storage units 3 may be separate cases, and the image forming unit 2 and the storage unit 3 may be stacked. At this time, an overlapping surface of the image forming unit 2 and the storage unit 3 is defined as a separation unit 4. The separation unit 4 will be described later with reference to FIG.

  Inkjet recording apparatus 1 includes paper feed rollers 102 and 103, conveyance roller pairs 104, 105, 112, 113, 114, 120, and 140, registration rollers 106, conveyance belt 107, driving roller 108, driven roller 109, fan 110, negative A pressure chamber 111, a discharge roller pair 126, conveyance guides 130 and 131, a duct 141, and a sensor 160 are included.

  The paper cassettes 100 and 101 may hold paper P having different sizes. The paper feed roller 102 takes out the paper P corresponding to the selected paper size from the paper cassette 100 and passes it through a slit 301 (to be described later) of the separation unit 4 from the transport roller pair 140, and the transport roller pair 104 and the registration roller pair. Transport to 106. The paper feed roller 103 takes out the paper P corresponding to the selected paper size from the paper cassette 101, passes the paper roller pair 105 and the transport roller pair 140 through the slit 301 of the separation unit 4, and feeds the transport roller pair 104 and the registration roller. Transport to pair 106.

  The conveyor belt 107 is tensioned by a driving roller 108 and two driven rollers 109. The surface of the conveyor belt 107 has innumerable small diameter holes at predetermined intervals. The top plate of the negative pressure chamber 111 connected to the fan 110 via the duct 141 is in close contact with the back surface of the transport belt 107 so that the paper P is adsorbed to the transport belt 107 inside the transport belt 107. The negative pressure chamber 111 has an upper top plate having a number of grooves and holes and a hole for connecting an air exhaust duct 141, and the hollow interior is set to a negative pressure by the suction of the fan 110, The plate surface contacts the surface of the conveyor belt 107.

  The conveyor belt 107 is an endless belt manufactured by laminating rubber on fibers and polishing the surface. The conveyor belt 107 may be an end-treated belt made of stainless steel or the like. With the suction force generated by the fan 110, the paper P is adsorbed to the conveyance surface of the conveyance belt 107 through the duct 141, the negative pressure chamber 111, and countless small diameter holes on the conveyance belt 107.

  On the paper discharge side, a conveyance roller pair 112, 113, 114 and a paper discharge roller pair 126 are provided. The pair of transport rollers 120 and the transport guides 130 and 131 transport the paper P to the paper feeding side again when performing double-sided printing. The conveyance guides 130 and 131 switch the conveyance route of the paper P by solenoids 211 and 212 (shown in FIG. 3).

  FIG. 2 is an enlarged view of the inkjet head 115, the ink cartridge 116, and the tube 118. Four lines of line-type inkjet heads 115 that discharge ink onto the paper P according to image data are arranged above the conveyance belt 107. The inkjet head 115Y that discharges yellow (Y) ink from the upstream, the inkjet head 115M that discharges magenta (M) ink, the inkjet head 115C that discharges cyan (C) ink, and the inkjet head 115K that discharges black (K) ink. They are in order.

  Further, each inkjet head 115 is provided with a yellow (Y) ink cartridge 116Y, a magenta (M) ink cartridge 116M, a cyan (C) ink cartridge 116C, and a black (K) ink cartridge 116K that hold each color ink. They are connected by tubes 118Y, 118M, 118C, and 118K, respectively.

  Each color ink is yellow, magenta, cyan, and black, and water-based ink having a water content of about 30 to 80% by weight is used in the composition other than the solid content and additives. In the above description, a configuration in which an image is formed with a plurality of colors of yellow, magenta, cyan, and black is shown.

  FIG. 3 is a block diagram of the inkjet recording apparatus 1. The inkjet recording apparatus 1 temporarily records a CPU (Central Processing Unit) 201 that is a control unit, a ROM (Read Only Memory) 202 that stores various programs, and various variable data and image data. A RAM (Random Access Memory) 203 and an interface (I / F) 204 for inputting data from outside and outputting data to the outside. Further, the inkjet recording apparatus 1 includes a paper feed roller motor control drive circuit 213 that controls a paper feed roller motor 214 connected to the paper feed rollers 102 and 103, and a plurality of conveyance roller pairs 104, 105, 112, 113, 114, 120, 140 and a conveyance roller motor control drive circuit 215 for controlling a conveyance roller motor 216 connected to the registration roller 106, and a belt drive motor control for controlling a belt drive motor 218 connected to the drive roller 108. A drive circuit 217 and a paper discharge roller motor control drive circuit 219 for controlling the paper discharge roller motor 220 connected to the plurality of paper discharge roller pairs 126 are provided.

  The paper feed roller motor 214, the transport roller motor 216, the belt drive motor 218, and the paper discharge roller motor 220 may be performed by one common motor. In addition, the ink jet recording apparatus 1 is connected to a sensor control drive circuit 205 that controls the sensor 160, a fan control drive circuit 206 that controls the fan 110, and a solenoid 209 that opens and closes the open / close unit, and controls the open / close unit. The drive circuit 208, the path change control drive circuit 210 connected to and controlled by the solenoids 211 and 212 for path change, and the inkjet head control drive for controlling the inkjet head 115Y, the inkjet head 115M, the inkjet head 115C, and the inkjet head 115K. A circuit 221 is included.

  The CPU 201 includes a ROM 202, a RAM 203, an I / F 204, a sensor control drive circuit 205, a fan control drive circuit 206, an opening / closing unit control drive circuit 208, a path change control drive circuit 210, and a paper feed roller motor control drive circuit 213 via a bus. Further, the conveyance roller motor control drive circuit 215, the belt drive motor control drive circuit 217, the paper discharge roller motor control drive circuit 219, and the inkjet head control drive circuit 221 are connected. The sensor 160 detects whether or not the paper P is passing. A detection result by the sensor 160 is transmitted to the CPU 201 via the sensor control drive circuit 205. The ink jet head 115Y, the ink jet head 115M, the ink jet head 115C, and the ink jet head 115K discharge the ink jet head from the nozzles onto the paper P based on the signal from the ink jet head control drive circuit 221.

  Hereinafter, the separation unit 4 will be described. The separation unit 4 separates the image forming unit 2 and the storage unit 3.

  In the image forming unit 2, water-based ink is sprayed from the ink jet head 115 to the paper P for image formation, so that the water vapor is filled inside the ink jet recording apparatus 1 isolated from the outside air, and the humidity increases. To do. Therefore, the separation unit 4 separates the image forming unit 2 and the storage unit 3 so that moisture of the image forming unit 2 cannot flow into the storage unit 3.

  FIG. 4 is a diagram illustrating the separation unit 4 in a state where the opening / closing unit is closed. The separation wall 300 is a wall that separates the image forming unit 2 and the storage unit 3. The separation wall 300 includes a slit 301 that allows the paper P to pass from the storage unit 3 to the image forming unit 2 during image formation, and further includes an opening / closing unit 302 that closes and opens the slit 301. The separation wall 300 includes a slide guide 303, a spring 304, and a solenoid 209. The vertical width of the opening / closing portion 302 is larger than the vertical width of the slit 301, and the horizontal width of the opening / closing portion 302 is larger than the horizontal width of the slit 301. When the opening / closing portion 302 closes the slit 301, the opening / closing portion 302 covers the slit 301. So close.

  The openable / closable opening / closing section 302 is attached to the slide guide 303 so as to be slidable in the direction of arrow X in FIG. The opening / closing part 302 is fixed to the solenoid 209 via a link. The fixed part of the opening / closing part 302 and the solenoid 209 can be flexibly connected. One end of the spring 304 is fixed to the inkjet recording apparatus 1, and the other end is fixed to the end of the opening / closing unit 302.

  As shown in FIG. 4, the solenoid 209 is OFF and closes the slit 301 except during image formation. At this time, the spring 304 is in a contracted state.

  FIG. 5 is a flowchart of opening / closing of the opening / closing unit 302. Hereinafter, the CPU 201 controls the inkjet recording apparatus 1 to be described. In 1000, it is determined whether the paper feed roller 102 or 103 has performed a paper feed operation. When a printing command is issued from the user, the paper P is fed by the paper feed roller 102 in the paper cassette 100 of the storage unit 3, and the paper P is fed by the paper feed roller 103 in the paper cassette 101.

  If the user does not issue a print command and the paper feed roller 102 or 103 does not perform a paper feed operation (No in 1000), the opening / closing unit 302 remains closed so as to close the slit 301, and the 1000 judgment is repeated.

  If the paper feed roller 102 or 103 is actuated (1000: Yes), in order to convey the paper P from the storage unit 3 to the image forming unit 2 in 1001, the opening / closing unit 302 of the separation unit 4 is opened and the slit 301 is opened. To do. FIG. 6 shows the separation unit 4 with the opening / closing unit 302 open. As shown in FIG. 6, when the solenoid 209 is turned on, the opening / closing part 302 moves in the direction of the arrow Y and opens the slit 301. The opening / closing part 302 slides on the slide guide 303, and the spring 304 is stretched by the movement of the opening / closing part 302 in the arrow Y direction.

  After the opening / closing unit 302 is opened in 1001 and the slit 301 is opened, in 1002, the passage of the paper P is detected by the sensor 160, and it is determined whether the conveyance of the paper P to the image forming unit 2 is completed. If the sensor 160 has not detected that the conveyance of the paper P has been completed (No in 1002), the determination in 1002 is repeated. During this time, the opening / closing unit 302 is kept open and the slit 301 is opened. is there. When the sensor 160 detects that the conveyance of the paper P has been completed (Yes in 1002), in 1003, the opening / closing part 302 is closed, the slit 301 is closed, and the process is terminated. When a plurality of sheets of paper P are continuously conveyed to the image forming unit 2, the opening / closing unit 302 is closed, the slit 301 is closed after completion of conveyance for the number of sheets to be continuously conveyed, and the process ends.

  When closing the opening / closing part 302, the opening / closing part 302 moves in the direction opposite to the arrow Y direction by turning off the solenoid 209 and closes the slit 301. As the solenoid 209 moves in the direction opposite to the arrow Y direction, the opening / closing portion 302 slides on the slide guide 303, and the spring 304 returns to the state shown in FIG. When the print command is not issued, the opening / closing unit 302 closes the slit 301 of the separation unit 4, thereby separating the paper P stored in the storage unit 3 from the image forming unit 2.

  The opening / closing portion 302 is not limited to the solenoid 209, and a motor may be used. Further, the embodiment has been described in which the opening / closing unit 302 is opened when the paper P is fed by the paper feed roller. However, a sensor is provided upstream of the passage of the slit 301 to detect that the paper P has been fed. good.

  In the above embodiment, the opening / closing part 302 and the solenoid 209 are provided on the lower surface of the separation wall 300, and the slit 301 for transporting the paper P is opened when it is moved in the arrow Y direction in FIG. In addition to this configuration, the opening / closing part 302 and the solenoid 209 may be provided on the upper surface of the separation wall 300. Further, the slit 301 may be opened when the opening / closing part 302 is moved in the direction opposite to the arrow Y direction. Further, the slit 301 may be opened when the opening / closing portion 302 is moved in the near direction of FIG. 1 or in the opposite direction of the near direction.

  Hereinafter, the relationship between the passage of time and the curl amount of the paper depending on the paper storage conditions will be described. FIG. 7 is a diagram showing the passage of time and the curl amount of the paper. For three types of paper, wet paper, normal paper, and dry paper, the curl amount of the paper over time when image formation was performed by full-surface printing using water-based ink with a water content of about 50% by weight. It is the result of measurement. Wet paper is paper that has been left in an environment of 35 ° C. and 80% RH for 24 hours or more, and normal paper is paper that has been left in an environment of 25 ° C. and 50% RH for 24 hours or more, and has been dried. The paper is paper that has been left in an environment of 10 ° C. and 20% RH for 24 hours or more.

  As shown in FIG. 7, curl slightly occurs immediately after printing, and the curl amount decreases after several hours, but then the curl amount gradually increases. In the graph of FIG. 7, the direction in which the curl of the paper immediately after printing occurs is a positive value of the curl amount. When the leaving time has passed about 3 hours, the ordinary paper and the dry paper are slightly negative. This indicates that a slight curl has occurred in the direction opposite to the direction of curl that occurred immediately after printing.

  The curl amount refers to a curled four-sided curl measured by measuring the length curled from the plane to the top at the four corners of a sheet of paper, on which a solid image was printed using water-based ink. Defined as average length. FIG. 8 is a diagram showing a sheet that has been curled by performing image recording by full surface printing using water-based ink. The curl amount of the paper is obtained by dividing the curl amount (h + i + j + k) at four corners by four.

  As shown in FIG. 7, the wet paper has a larger curl amount with time, and the dry paper has a smaller curl amount with time. As described above, when the entire surface is printed on the wet paper by the water-based ink jet head and then left in an environment where the humidity is lower than the environment where the paper P is stored, the curl amount of the paper P printed on the entire surface Amplifies. On the other hand, when the entire surface of the paper P stored in a dry humidity environment is printed with a water-based ink jet head and then left in a damp environment than the environment in which the paper was stored, Curling amount is suppressed. Therefore, curling of the paper P can be suppressed by drying the environment where the paper P is stored rather than the environment where the paper P outside the inkjet recording apparatus 1 is discharged.

  According to the first embodiment, the separation unit separates the paper P stored in the storage unit 3 from the image forming unit 2 so that moisture in the image forming unit 2 cannot flow into the storage unit 3. Curling of the paper P after image formation can be suppressed.

(Second embodiment)
The second embodiment shown in FIG. 9 includes an elastic member 400 at the edge of the slit 301 included in the separation unit 4. In the figure, the same components as those in the first embodiment are denoted by the same reference numerals. The second embodiment is different in the configuration of the separation unit 4 in the side cross-sectional view of the inkjet recording apparatus 1 described in FIG. 1 of the first embodiment.

  FIG. 9 is an enlarged view of the slit 301 of the separation unit 4 in the second embodiment. The separation wall 300 has a slit 301 through which the paper P passes from the storage unit 3 to the image forming unit 2 during image formation, and further includes an opening / closing unit 302 that closes and opens the slit 301. The separation wall 300 has an elastic member 400 at the edge of the slit 301 on the side in contact with the opening / closing part 302. The separation wall 300 includes a slide guide 303, a spring 304, and a solenoid 209. The elastic member 400 provided at the edge of the slit 301 is, for example, rubber or urethane.

  FIG. 10 is a side cross-sectional view of the separation portion 4 in the second embodiment. 9 and 10 indicate the elastic member 400. When closing the opening / closing part 302, the elastic member 400 provided at the edge of the slit 301 is pressed by the opening / closing part 302. In this way, the opening / closing part 302 presses the elastic member 400, so that the opening / closing part 302 can be closed and the slit 301 can be closed without gaps.

  The ink jet recording apparatus 1 configured as described above can suppress the curling of the paper P. Further, the elastic member 400 is provided in the slit 301, and the opening / closing part 302 presses the elastic member 400 when the opening / closing part 302 is closed, so that the slit 301 can be closed without a gap, and curling of the paper P is further suppressed. Can do.

  You may make it provide an elastic member in the clearance gap in which external air enters in the storage part 3 of the inkjet recording device 1. FIG. The paper cassettes 100 and 101 in FIG. 1 can be pulled out toward the front of the drawing. For example, when the paper cassettes 100 and 101 are pulled out, an elastic member 400 is provided in a gap that allows outside air to enter. Anyway. In addition, instead of having the elastic member 400 at the edge of the slit 301, the opening / closing part 302 is formed of an elastic member, and the opening / closing part 302 is closed to press the separation wall 300 when closing the slit 301. Alternatively, the elastic member 400 may be provided at the edge of the slit 301, and the opening / closing portion 302 may be formed of an elastic member.

(Third embodiment)
In the third embodiment shown in FIG. 11, the slit 301 is opened or closed by the rotation of the opening / closing part 500. In the figure, the same components as those in the first embodiment are denoted by the same reference numerals. The third embodiment is different in the configuration of the separation unit 4 in the side cross-sectional view of the inkjet recording apparatus 1 described in FIG. 1 of the first embodiment.

  The separation unit 4 includes a slit 301 that allows the paper P to pass therethrough, and an opening / closing unit 500 that opens and closes the slit 301 is provided. The separation unit 4 includes a solenoid 209, a separation wall 300, a slit 301, a spring 304, and an opening / closing unit 500. One end of the opening / closing part 500 is fixed to the separation wall 300 with a shaft 501 and further fixed to the solenoid 209 with a shaft 502. The opening / closing part 500 is rotatable about shafts 501 and 502. One end of the spring 304 is fixed to the separation wall 300 and the other end is fixed to the opening / closing part 500, and the spring 304 expands and contracts by opening / closing the opening / closing part 500. When the solenoid 209 is OFF, the opening / closing part 500 is closed and the slit 301 is closed, and when the solenoid 209 is ON, the opening / closing part 500 is opened and the slit 301 is opened.

  If a print command is issued and the sheet P is not fed from the storage unit 3, the slit 301 closes and closes the opening / closing unit 500 as shown in FIG. When the paper P stored in the storage unit 3 is conveyed to the image forming unit 2 based on the print command, the solenoid 209 is turned on, the opening / closing unit 500 moves in the arrow Z direction, and rotates about the shafts 501 and 502. Move. FIG. 12 is a view showing a state where the opening / closing part 500 is rotated and the slit 301 is opened. At this time, the spring 304 is in a contracted state.

  After confirming that the paper P has been conveyed from the storage unit 3 to the image forming unit 2, the solenoid 209 is turned off, and the opening / closing unit 500 moves in the direction opposite to the arrow Z direction to return to the state of FIG.

  Although several embodiments have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the gist of the invention, and in the invention described in the claims and the equivalents thereof. The first embodiment, the second embodiment, and the third embodiment may be combined.

DESCRIPTION OF SYMBOLS 1 Inkjet recording device 2 Image formation part 3 Storage part 4 Separation part 100, 101 Paper cassette 102, 103 Paper feed roller 115 Inkjet head 116 Ink cartridge 110 Fan 150 Dehumidification part 160 Sensor 201 CPU (control part)
202 ROM
203 RAM
204 I / F
205 Sensor control drive circuit 206 Fan control drive circuit 208 Opening / closing part control drive circuit 209, 211, 212 Solenoid 210 Path change control drive circuit 213 Feed roller motor control drive circuit 215 Conveyance roller motor control drive circuit 217 Belt drive motor control drive circuit 219 Ink-jet head control drive circuit 300 Separating wall 301 Slit 302, 500 Opening / closing part 303 Slide guide 304 Spring 400 Elastic member 501, 502 Shaft

Claims (9)

A storage unit for storing the recording medium;
An image forming unit that forms an image by ejecting water-based ink onto the recording medium conveyed from the storage unit;
A slit that allows the recording medium to pass from the storage unit to the image forming unit, and an opening / closing unit that opens and closes the slit, and a separation unit that separates the storage unit and the image forming unit;
A detection unit that detects conveyance of the recording medium from the storage unit to the image forming unit;
According to the detection result of the detection unit, a control unit that controls to open and close the opening and closing unit,
An inkjet recording apparatus comprising:   The inkjet recording apparatus according to claim 1, further comprising a dehumidifying unit that dehumidifies the storage unit.   The vertical width of the opening / closing part is larger than the vertical width of the slit, the horizontal width of the opening / closing part is larger than the horizontal width of the slit, and the opening / closing part covers the slit. Inkjet recording apparatus.   The detection unit detects a feeding of the recording medium from the storage unit and a second detection unit detects that the recording medium has been conveyed from the storage unit to the image forming unit. The inkjet recording apparatus according to claim 1, further comprising a detection unit.   When the first detection unit detects the feeding of the recording medium, the opening / closing unit is moved to open the slit, and the second detection unit is transferred from the storage unit to the image forming unit. The ink jet recording apparatus according to claim 4, wherein when it is detected that the ink is conveyed, the opening / closing portion is moved to control the slit to be closed.   The ink jet recording apparatus according to claim 1, further comprising an elastic member at an edge of the slit on a surface side of the separating portion that contacts the opening / closing portion.   The inkjet recording apparatus according to claim 6, wherein the opening / closing part presses the elastic member when the opening / closing part closes the slit. A storage unit that stores the recording medium, and an image forming unit that forms an image by discharging aqueous ink onto the recording medium conveyed from the storage unit,
The inkjet recording apparatus, wherein the storage unit is separated from the image forming unit by a separation unit having a slit through which the recording medium passes and an opening / closing unit that opens and closes the slit.   The inkjet recording apparatus according to claim 8, wherein the storage unit is dehumidified.

Images