JP2004237748A - Manufacturing method of ink cartridge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reliably fill ink to a cartridge in which a porous member is stored in a compressed state. <P>SOLUTION: In a first step, an ink supply opening is formed, and the body is set upside down in a pallet. In a second step, a packing is inserted to the ink supply opening, and a sealing film is thermally welded to it. In a third step, the container main body is vertically flipped over and set again. In a fourth step, a filter member is fixedly secured. In a fifth step, the porous member is inserted to the body so as to be compressed. In a sixth step, a lid member is adhered to the body so as to form the container. In the lid member, an ink injection opening and an atmosphere communication opening are formed, and a narrow groove connected to the atmosphere communication opening is formed on the surface. In a seventh step, a predetermined amount of ink is injected to a foam chamber under reduced pressure. In an eighth step, a gas barrier film is adhered onto the surface of the lid. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

  The present invention relates to a method of manufacturing an ink cartridge for an ink jet recording apparatus in which an ink jet recording head and an ink cartridge are mounted on a carriage, and ink is supplied by replacing the cartridge.

In the case of an ink jet printer in which an ink container is mounted on a carriage equipped with an ink jet recording head, in order to prevent fluctuations in water head pressure caused by ink sway due to movement of the carriage and printing defects due to foaming. As described in Patent Document 1, there has been proposed a device in which an ink container is divided into two regions, a porous body is stored on the recording head side, and ink is stored in the other region. I have.
With such a structure, ink is supplied to the recording head through the porous body, so that inconvenience caused by the swing of the ink can be prevented.
European Patent Application No. 581531

However, since the porous body is housed in a compressed state in the container, it is difficult to fill the ink by spreading it to every corner.
An object of the present invention is to propose a method of manufacturing an ink cartridge that can reliably inject degassed ink into an ink cartridge having a porous body housed in a compressed state.

  In order to solve such a problem, the invention of claim 1 includes a foam chamber for accommodating a porous body made of at least an elastic material that absorbs ink, an ink supply port is formed on a bottom surface, and an upper portion is opened. A first step of preparing a substantially rectangular parallelepiped container body and setting it on a pallet such that the bottom surface thereof faces upward, and inserting a packing into the ink supply port, and heat-sealing a sealing film to the ink supply port. A second step of reversing the container body, a third step of turning the container body upside down and resetting the container on the pallet, a fourth step of fixing a filter material to an inflow port side communicating with the ink supply port, and the foam A fifth step of inserting the porous body into the chamber in a compressed state, and a lid member having an ink injection port, an air communication port, and a narrow groove formed on the surface to be connected to the air communication port. In the opening A sixth step of attaching the container to form a container, a seventh step of housing the container in a reduced pressure environment and injecting a prescribed amount of ink into the foam chamber, and at least the ink injection on the surface of the lid material. And an eighth step of bonding an air-permeable film so as to cover the entrance and the area of the narrow groove. The first to eighth steps are sequentially performed.

  According to a fifth aspect of the present invention, there is provided an ink cartridge having an ink storage region in which a porous body made of an elastic material that absorbs ink is loaded, and an ink cartridge having an ink supply port communicating with the ink storage region. Then, the ink is heated to 10 to 20 ° C. or more higher than room temperature, and a predetermined amount is injected into the ink storage area.

  According to the first aspect of the present invention, the degassed ink can be injected into the container in which the porous body is stored in the compressed state while maintaining the degassed state.

  According to the fifth aspect of the present invention, the degassed ink can be reliably injected into the pores of the porous body in the compressed state.

  FIG. 1 shows an embodiment of an ink cartridge to which the manufacturing method of the present invention is applied, which accommodates three types of inks of cyan, magenta, and yellow. In FIG. The container body is a substantially rectangular parallelepiped container slightly expanding, and is formed by injection-molding a polymer material such as polypropylene, polyethylene, or polystyrene in order to facilitate joining with each member by heat welding.

  The container body 1 includes foam chambers 6, 6, 6 for housing a porous body 5 made of an elastic material suitable for absorbing ink from the partition plates 2, 3, 4, and an ink chamber 7, for housing ink as it is. 7, 7 are separated.

  At the lower end of each foam chamber 6, an ink supply port 8 for engaging with the ink supply needle of the recording head is provided, and the opening of the container body 1 is punched so as to be located near the ink supply port 8 of the foam chamber 6. It is sealed with a lid 11 provided with the provided ink inlets 9, 9, 9 and the air communication ports 10, 10, 10.

  At the bottom of each foam chamber 6, a convex portion 12 for compressing the porous body 5 in cooperation with the lid 11 is formed, and a concave portion 13 for forming an empty room having a certain opening area at the upper end thereof. Are formed, and a through hole 14 extending from the concave portion 13 to the ink supply port 8 is formed. An enlarged portion 15 is formed at the outer end of the through hole 14 so as to be in liquid-tight engagement with the ink supply needle of the recording head, and a packing 16 is inserted. The filter material 17 is stuck so as to cover.

  The surfaces of the filter material 18, the concave portions 12, and the through holes 14 that are in contact with the ink are subjected to a process of irradiating ultraviolet rays to improve the wettability to the ink.

  The packing 16 is formed by forming a ring-shaped thin rib 16b on the surface 16a as shown in FIG. 3, and the ink-resistant surface 16a on the convex portion 12 side as shown in FIG. An adhesive 19 having a property is applied so as to completely fill the space S between the container body 1. A pressing member 20 having a window 20a through which an ink supply needle can be inserted is elastically contacted with the lower end of the packing 16 as shown in FIG. The packing 16 is inserted in a state in which the expanding portion 16b is elastically deformed in the expanding portion 15.

  By employing such a method, communication between the space S existing between the side portion of the packing 16 and the expanded portion 15 and the through hole 14 can be cut off.

  The tip of the ink supply port 8 formed by inserting the packing 16 in this way can be broken by inserting an ink supply needle, and is preferably made of a low-density polyethylene film or the like having high gas permeability and low moisture permeability. A gas permeable film 21 is adhered to the container body 1 and a meat steal portion 22 is provided between the container body 1 and the bottom portion 1a so that a space can be secured inside even when the container is sealed in a packaging bag or the like. ing.

  On the surface of the lid 11, as shown in FIG. 5A, meandering grooves 23, 23, 23 having one end communicating with the atmosphere communication port 10 and the other end extending to the other side of the lid 11 are formed. Then, as shown in FIG. 5B, the tongue piece 24a is peeled off so that the tip 23a of the groove 23 can be opened to the atmosphere so as to cover the ink inlet 9, the air communication port 10, and the groove 23. 24 is stuck. As the film 24, it is desirable to use an air-shielding film such as a low-density polyethylene film having high gas permeability and low moisture permeability.

Next, the manufacturing method will be described.
FIG. 6 shows an embodiment of a pallet for transferring the container main body during the manufacturing process. The pallet 30 has a position where the outer periphery of the bottom surface 1a of the container main body 1 fits on the surface thereof, and an opening. At least four pins 31 and 32 are respectively implanted at positions where the inner surface of 1b is to be fitted, and a concave portion 33 capable of accommodating the pins 31 and 32 is formed at a position opposed to the ink supply port 8, and further described later. And a step portion 34 for forming a seal portion in the ink injection step.

  First, the container body 1 (FIG. 7 (I)) formed in advance by injection molding is set on the pallet 30 with the opening 1b aligned with the pin 31 so that the bottom surface 1a faces upward. Is temporarily press-fitted into the ink supply port 8, and then the press-in jig 40 is rotated around the center and press-fitted to a predetermined position while reducing friction (FIG. 7 ( II)). When the press-fitting is performed while giving a twist as described above, the packing 16 is fitted into the ink supply port 8 without turning up the end area such as the peripheral edge or twisting. From the container body 1 can be reliably prevented, and the gap between the container body 1 and the container body 1 can be filled with an adhesive.

  After the packing 16 is immersed in the ink to allow the ink to adhere thereto, the packing member is loaded in the same manner as described above, and the pressing member 20 having the window 20a through which the ink supply needle can be inserted as described above is attached to the lower end of the packing 16. By elastically contacting and thermally welding to the container body 1, the ink is injected in advance into a space 20 (FIG. 4) into which ink is unlikely to enter in an ink filling step described later, and the outer side surface of the packing 16 and the expanded portion 15 are And the ink supply port 8 can be shut off.

  An air-shielding film 21 made of a heat-welding material is set so as to cover the ink supply port 8, and the periphery of the ink supply port 8 is heated and pressed by a jig 41 to seal the ink supply port 8 with the film 21. (FIG. 7 (III)) The lot number and expiration date are printed or stamped on the bottom surface 1a and the side surface 1c as necessary.

  When all operations on the bottom surface 1a of the container body 1 are completed, the container body 1 is turned upside down, and the container body 1 is reset on the pallet 30 so that the opening 1b of the container body 1 faces upward.

  A tape of a filter material such as a mesh material of non-corrosive steel or a non-woven fabric, which is a filter having a width slightly larger than the width of the concave portion 13 formed in the convex portion 12 passing through the ink supply port 8 and the through hole, is used. The filter material 17 is cut obliquely to the predetermined direction to form a filter material 17, which is set so as to cover the concave portion 13, and heated and heated by the jig 42 to such an extent that the container body 1 is slightly softened after setting. Pressure welding is performed (FIG. 8 (I)). When the tape of the filter material 17 is formed by weaving a non-rust steel wire, it is possible to prevent fraying by cutting the tape so as to be non-parallel to the direction of the wire that becomes the warp and the weft. it can.

  If the occurrence of fraying is completely eliminated, the following effects are obtained. That is, when the wire constituting the filter material 17 penetrates into the region of the packing 16, the wire is pinched between the ink supply needle of the recording head and the packing 16 when the cartridge is mounted on the recording head. There is a problem in that the airtightness between the ink supply needles of the recording head and the cartridge is reduced, which allows air from the outside to enter and hinders the supply of ink to the recording head. Problems can be reliably avoided.

  Also, the tape material is cut obliquely as described above in comparison with a shaping method in which the filter material is stamped out by pressing in accordance with the shape of the convex portion 12 to which the filter material 17 is fixed, usually a circle or an ellipse. When the shaping method is adopted, the tape material can be effectively used in addition to preventing the wire from being frayed.

Next, the process proceeds to the step of press-fitting the porous body 5.
9 (a) and 9 (b) show an embodiment of the porous body insertion device and the porous body insertion step, respectively. The porous body insertion device is shown in FIG. 9 (a). Compression members 43, 43 formed in a comb-like shape and movable in the opposite direction, and a pressing member 44 located between the compression members 43 and capable of moving up and down.

  The compression members 43, 43 are moved in the horizontal direction to sandwich the porous body 5 (FIG. 9 (b) I), and compressed until the width of the outer ends of the compression members 43, 43 becomes smaller than the inner width of the foam chamber 6. The members 43, 43 are moved toward the pressing member 44 to compress the porous body 5 so that the width thereof is smaller than the width of the foam chamber 6 (FIG. 9B).

  Then, the porous body 5 is moved into the foam chamber 6 and the pressing member 44 between the two compression members 43 is moved toward the container body 1 to push the porous body 5 into the foam chamber 6 from the upper end (FIG. 9B). III). Then, after the pressing member 44 is further lowered slightly, the container body 1 is retracted from the porous insertion device.

  As a result, as shown in FIG. 8 (II), the porous body 5 molded slightly larger than the volume of the foam chamber 6 is set in the foam chamber 6 in a compressed state.

  Next, the lid member 11 is positioned in the opening 1b of the container body 1, and the lid member 11 is pressed against the container body 1 with a predetermined pressure, and the flat surface of the lid member 11 is fixed via the jig 45 in a plane including the opening 1b. , Or a vertical direction, or an oblique direction, or a combination thereof, so that the opening 1b of the container body 1 and the back surface of the lid 11 are frictionally fused and bonded. (FIG. 8 (III)).

  After welding, a heating rod 46 heated to a temperature sufficient to soften the materials constituting the container body 1 and the lid member 11 is brought into contact with the periphery of the joint, or hot air is sprayed from the spray nozzle 47 to perform the welding. Is removed (FIG. 10).

  When the container is completed in this way, it is moved to the ink injection station. FIG. 11 shows an embodiment of the ink injection device. In the figure, reference numeral 50 denotes a receiving table for holding the pallet 30, which is configured to be vertically movable by a driving mechanism (not shown) as shown by an arrow A. I have. Reference numeral 51 denotes a base provided with a through hole, an injection chamber 53 formed by a stepped portion 34 on the peripheral surface of the pallet 30 on the lower surface, and a lid member 52 described below on the upper surface. 55.

  Reference numeral 52 denotes the above-described lid member, and a through-hole 56 is formed in a region facing the injection chamber 53, and a piston member 57 that can move up and down as shown by an arrow B in the figure while maintaining an airtight state is provided here. Has been inserted.

  The piston member 57 has an injection needle 58 at a position facing the ink injection port 9 of the container 1 set in the injection chamber 53 and a flow communicating with an air supply device (not shown) so as to face the air communication port 10 of the container 1. A road 60 is provided. The injection needle 58 is connected to a branch pipe 62 via a flow path 59 and a tube 61.

  Reference numeral 63 denotes a gas-liquid separation unit. In this embodiment, the upper end and the lower end are liquid-tightly fixed to a cylinder 65 so that the hollow fiber bundle 64 is used as a liquid flow path, and the cylinder 65 is connected to a vacuum pump 66 so as to be hollow. One end of a cylinder 65 is connected to an ink tank 68 by a tube 67, and the other end is connected to a branch pipe 62 via a stop valve 69.

  Reference numeral 70 denotes a measuring tube, which is constituted by a cylinder 71 and a piston 72, and whose top dead center is connected to the branch tube 62 by a tube 73. In the drawing, reference numeral 74 denotes a stop valve, and reference numeral 75 denotes a pump for pressure feeding of ink.

  When the pallet 30 on which the container 1 in which the components have been assembled by the above-described steps is placed reaches the ink injection device and is set below the injection chamber 53 (FIG. 12 (I)), the receiving table 50 is It rises until it comes into close contact with the lower surface of the table 51 (FIG. 12 (II)).

  Then, the piston 56 is lowered to such an extent that a space can be secured between the piston 56 and the lid member 11 of the container 1, and the stop valve 74 is opened while the stop valve 68 communicating with the gas-liquid separation unit 63 is kept closed. Then, the vacuum pump 55 is operated to reduce the pressure in the injection chamber 53, the tubes 61 and 73, and the measuring tube 70 to a predetermined pressure (FIG. 13 (I)).

  When the pressure has been reduced to a predetermined pressure, the stop valve 74 is closed and the stop valve 68 is opened to inject a predetermined amount of the ink 7 into the measuring pipe 63 (FIG. 13 (II)). At the same time, the piston member 57 is lowered to the bottom dead center. As a result, the packings 77 and 78 at the lower end of the piston member 47 elastically contact the ink supply port 10 and the air communication port 10 of the container 1, and the injection needle 58 enters near the bottom of the container 1.

  In this insertion process, preferably, when the injection needle 58 is located immediately above the filter 17, the ink can be reliably filled without leaving air bubbles in the filter 17, the concave portion 13, the through hole 14, and the packing 16. By forming the ink ejection ports of the ink injection needles radially, the ink can be uniformly absorbed by the entire porous body 5.

  Since the gas-liquid separation unit 63 is connected near the measuring pipe 70, the ink immediately after being degassed by the gas-liquid separating unit 63 flows into the measuring pipe 70.

  Next, in a state where the stop valve 69 is closed to shut off the gas-liquid separation unit 63, the stop valve 74 is opened to press the piston of the measuring pipe 70 to discharge a predetermined amount of ink. A predetermined amount of ink is injected (FIG. 14).

  At this time, the ink that has been securely degassed by the gas-liquid separation unit 60 is injected into the porous body 5, so that the ink cannot be completely discharged in the above-described depressurizing step (FIG. 13I). The gas adsorbed in the fine pores 5 is easily dissolved and the gas is uniformly absorbed by the porous body 5 without generating bubbles or remaining in the porous body 5.

  In particular, when the tube 61 connecting the stop valve 74 and the ink injection needle 58 is heated so that the temperature rises by about 10 to 20 ° C. from room temperature during the ink injection period, the viscosity of the ink decreases and the porous body 5 Surely penetrates the pores of

  Thus, at the time when the ink injection is completed, at least the gas does not exist in the porous body 5, so that the print quality can be assured without bubbles.

  When the ink injection is completed, the exhaust port 60 is opened to the atmosphere, and the ink remaining on the porous body 5 is completely absorbed by the porous body 5 by a pressure difference from the atmospheric pressure. After that, the pedestal 50 is lowered, the pallet 40 is moved to the next step, and the ink adhering to the ink inlet 9 is wiped off by vacuum suction or a cloth, and finally, the conduit is brought into contact with the ink inlet 9. Then, a minute positive pressure is applied to wipe off the ink adhering to the back of the lid 11 to the porous body 5 side.

  The container 1 is tilted so that the air communication port 10 is directed upward, and is accommodated in a decompression container, and the air-shielding film 24 cut to a size that covers at least the air communication port 10, the ink inlet 9, and the narrow groove 23. Is temporarily fixed by thermal welding using a jig 80 (FIG. 15). At this time, even if the pressure in the container 1 rises due to the temperature rise, the air communication port 10 is located as high as possible, so the expanded air is quickly discharged from the air communication port 10 and 9 can be prevented from leaking.

  Then, the area covering the groove 19 is heated to weld one half of the film 24 and the other half of the film 24 is welded to the extent that it can be peeled off, and a capillary is formed by the narrow groove 19 and the film 24. When the ink cartridge is housed in the degassing chamber and degassed before the other half of the film 24 is attached, if the decompression value is suppressed to about 200 mmHg, the ink is supplied more than the filter 17 generated by the packing 16. The cartridge can be depressurized again while suppressing the physical growth of the nuclei of bubbles remaining near the mouth, and the ejection of ink from the ink inlet is suppressed, filling the ink cartridge with as much ink as possible. can do.

  As shown in FIG. 16, the ink cartridge 70 completed in this manner has at least a buffer material 81 contacted with at least the ink supply port 8 so as not to damage the seal 16 of the ink supply port 8, and an air-shielding film. After folding the tongue piece 24a of 24, the tongue piece 24a is inserted into a bag 83 with a gore 83a made of an air-shielding film.

  After the gore 83a near the opening is folded inward to form an even thickness, the area near the opening is heat-sealed and sealed under a reduced pressure environment (FIG. 17A). The meat stealing portion 22 forms a reduced pressure space with the bag 83. On the other hand, if the film 21 that seals the ink supply port 8 is made of a low-density polyethylene film or the like having high gas permeability and low moisture permeability, only the air dissolved in the ink near the ink supply port is used. Is passed through the film 21 and the meat stealing part 22 is discharged to the decompression space formed by the bag 83. As a result, the air solubility of the ink near the ink supply port can be reduced as much as possible, and the inflow of bubbles into the recording head can be prevented.

Further, the film 21 for sealing the ink supply port 8 and the film 24 for sealing the ink inlet 9, the exhaust port 10, and the groove 23 of the lid 11 have a low gas permeability and a low moisture permeability. By using a gas-insulating film such as a polyethylene film, the amount of dissolved air in the entire ink of the cartridge can be reduced as much as possible, and the generation of bubbles in the recording head can be reliably prevented.
Desirably, it is desirable to enclose in the bag 83 within 72 hours after re-degassing.

  In particular, when the recording head is filled with ink for the first time, it is necessary to surely dissolve bubbles in the recording head by dissolving the ink in the ink and remove the ink. Therefore, it is necessary to maintain the deaeration of the ink in the cartridge at about −300 mmHg. Hope. In order to maintain a high degree of deaeration of the ink in this manner, the thickness of the meat stealing portion 22 of the container is increased, or a thick space is actively formed between the bag 83 and the cartridge. It is desirable to provide a concave portion or a through hole in the cushioning material 81 or to enclose and seal a spacer.

  Finally, the product is placed in the case 84 and finished into a product (FIG. 17B). The ink cartridge included as an accessory of the recording apparatus main body is an ink cartridge that is first mounted on the recording head of the recording apparatus, so that the ink cartridge filled with the above-described high degassing ink is selected. It is desirable to supply an ink cartridge with a slightly lower degree of deaeration for supply, and the case 84 is configured to be distinguishable by symbols and colors so that these two types of cartridges can be easily distinguished.

  In the above-described embodiment, the cartridge having an ink chamber has been described as an example. However, as shown in FIG. 18, the container 1 is filled with the porous body 5 and only the porous body 5 has ink. It is obvious that the present invention can be applied to the manufacture of the cartridge 85 containing the.

  Further, as shown in FIG. 19, only one opening 87 which is used as an ink inlet and an air opening is formed in a small cartridge 86, but in such a case, FIG. As shown, by arranging the ink injection needle 58 and the channel 60 communicating with the exhaust device coaxially, one opening 87 of the cartridge 85 can be used simultaneously for the ink injection operation and the exhaust operation.

FIG. 2 is an assembled perspective view showing an embodiment of an ink cartridge to which the present invention is applied. FIGS. 3A and 3B are cross-sectional views showing an embodiment of the ink cartridge according to the first embodiment. (A) and (b) are a top view and a cross-sectional view, respectively, showing an embodiment of the packing. FIGS. 1A and 1B are enlarged cross-sectional views of an embodiment of an ink supply port. FIGS. 6A and 6B are a diagram showing the structure of the lid of the ink cartridge with the film removed, and a diagram showing the state in which the film is adhered, respectively. It is a figure showing an example of a pallet which holds and conveys a container. FIGS. (I), (II), and (III) are diagrams each showing an initial step of the ink cartridge forming step. FIGS. (I), (II), and (III) are diagrams showing a middle stage of the ink cartridge forming process. FIG. 1A is a view showing an embodiment of a porous body insertion device, and FIGS. 2B to 2I are diagrams showing steps of inserting a porous body into a container body. FIG. 9 is a diagram illustrating a step of shaping the outer shape of the cartridge. FIG. 2 is a configuration diagram illustrating an embodiment of an ink injection device. FIGS. (I) and (II) are diagrams showing an initial step of the ink injection step. FIGS. (I) and (II) are diagrams showing the middle stage of the ink injection process. FIG. 9 is a diagram illustrating a last step of the ink injection step. It is a figure which shows the sticking process of an air-permeable film. It is a figure which shows the first half process of a packaging process. It is a figure which shows the latter half process in a packaging process. FIG. 9 is a view showing another embodiment of the ink cartridge to which the manufacturing method of the present invention can be applied. FIG. 9 is a view showing another embodiment of the ink cartridge to which the manufacturing method of the present invention can be applied. FIG. 6 is a view showing another embodiment of the ink injection device suitable for the ink cartridge of the above.

Explanation of reference numerals

  Reference Signs List 1 container main body 5 porous body 6 foam chamber 7 ink chamber 8 ink supply port 9 ink injection port 10 atmosphere communication port 11 lid material 16 packing 16b ring-shaped rib S space

Claims (5)

It is provided with a foam chamber for accommodating at least a porous body made of an elastic material that absorbs ink, an ink supply port is formed on the bottom surface, and a substantially rectangular parallelepiped container body having an open upper portion is prepared. A first step of setting on a pallet,
A second step of inserting a packing into the ink supply port and thermally welding a sealing film to the ink supply port;
A third step of turning the container body upside down and resetting it on the pallet;
A fourth step of fixing a filter material on an inflow side communicating with the ink supply port;
A fifth step of inserting the porous body into the foam chamber in a compressed state;
A sixth step of forming a container by adhering a lid material having an ink inlet, an air communication port, and a narrow groove formed on the surface thereof to be connected to the air communication port to an opening of the container body;
A seventh step of housing the container under a reduced pressure environment and injecting a prescribed amount of ink into the foam chamber;
An eighth step of bonding an air-shielding film so as to cover at least the ink injection port on the surface of the lid member, and the area of the narrow groove;
And a method for manufacturing an ink cartridge, wherein the first to eighth steps are sequentially performed.   2. The method of manufacturing an ink cartridge according to claim 1, wherein the seventh step includes an operation of housing the container under a reduced pressure environment and heating the ink.   2. The method of manufacturing an ink cartridge according to claim 1, further comprising a step of performing degassing at a negative pressure of 200 mmHg or less with respect to the atmospheric pressure before welding the air-shielding film. 3.   4. The method for manufacturing an ink cartridge according to claim 3, further comprising the step of heat-sealing and sealing the vicinity of the opening under a reduced pressure environment within 72 hours after re-degasification.   An ink cartridge having an ink storage area loaded with a porous body made of an elastic material that absorbs ink and an ink supply port communicating with the ink storage area is housed under a reduced pressure environment, and the ink is stored at a temperature lower than room temperature by 10 to A method for manufacturing an ink cartridge, wherein the ink is heated to 20 ° C. or more and injected into the ink storage area in a prescribed amount.

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