JPH07150481A - Method for ink jet printing and printed product - Google Patents

Abstract

PURPOSE:To obtain a blur-free, high-quality printed product by ink jet printing of both surfaces of a medium to be printed pretreated with a treating agent containing a water-soluble resin and pH adjustor and/or a cationizing agent. CONSTITUTION:A medium to be printed such as cotton, hemp, silk, regenerated fibers or synthetic fibers is, in advance, treated with a cationizing agent and then pretreated with a treating agent containing a water-soluble resin (e.g. CMC, sodium alginate, hydroxyethyl cellulose) and, as necessary, a pH adjustor (e.g. inorganic or organic acid) followed by ink jet printing on both surfaces of the medium under such conditions as to be >=3nl in the inking level (nl) on one surface per mm<2> area and satisfy the relationship: nl/mum <=0.065 for nl and the thickness (mum) of the medium and then conducting a color-developing heat treatment, thus affording the aimed blur-free printed product excellent in developed color deepness.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to printing on a print medium using an ink jet printer, and more particularly to a printing method suitable for printing on the print medium.

[0002]

2. Description of the Related Art Conventionally, as a method of ink-jet printing on a print medium such as cloth, a method of applying an adhesive and temporarily adhering the cloth to a flat support having no elasticity and printing with a printer (special feature: (Kaisho 63-6183) or a method of dyeing a cloth pretreated with an aqueous solution containing any of water-soluble polymeric substances which are non-dyeing to the dye used, water-soluble salts and water-insoluble inorganic fine particles. (Japanese Patent Publication Sho 63-3159
4), there is a method (Japanese Patent Publication No. 4-35351) in which cellulosic fibers are pretreated with an aqueous solution containing an alkaline substance, inkjet dyeing with a reactive dye is performed, and dry heat fixing treatment is performed. The purpose of these prior arts is to prevent image bleeding, and to obtain a sharp pattern and a high density and clear printed material. However, it has not been possible to obtain the same color density and sharpness as those of a printed material obtained by a conventional printing method (screen printing). Furthermore, since the penetration of the cloth in the thickness direction is insufficient, the depth of color and uniform color loss on the back surface are insufficient. Therefore, the range of application of textiles has been narrowed down.

[0003]

The problems to be solved by the present invention are that image density is insufficient, color depth is insufficient, and there is no color loss on the back surface of the cloth. This is the point that the range of application of printed materials is limited.

[0004]

The inventor of the present invention has reached the present invention as a result of extensive research to solve the above-mentioned problems. That is, the present invention provides a treatment agent containing at least PH adjusting agent if necessary, a water-soluble resin, and or, on both sides of the pre-pre-processed the printing medium with a cationic treatment agent, one side of the ink per area 1 mm ² The impact amount (nl) is 3 nl or more, and the following relation between the ink impact amount (nl) on one surface per area of 1 mm ² and the thickness (μm) of the print medium (ink impact on one surface per 1 mm ² area) (Amount / thickness of print medium) ≦ 0.065, ink jet recording is carried out under conditions such that color development treatment is followed by washing with water and drying, and the print medium is cotton,
It is an ink-jet printing method characterized in that it is made of silk, hemp, rayon, acetate, nylon, polyester fibers and their blends. Furthermore, the printed medium is a color pudding on both front and back surfaces, which is an inkjet printed material obtained by the above method. The present invention will be described in detail below.

The basic constituent elements of the present invention are, firstly, a pretreatment agent containing at least a water-soluble resin and, if necessary, a pH adjusting agent, and / or a print medium treated with a cationization treating agent. Secondly, after the printing is performed on the pre-processed print medium, the back side is also printed, and after the color development process, washing and drying are performed.

In the present invention, it is necessary to treat with a pretreatment agent containing a water-soluble resin and, if necessary, at least a pH adjusting agent in order to suppress the bleeding of the image on the cloth.
The water-soluble resin is a water-soluble natural or synthetic resin or a modified product thereof, and the pH adjusting agent needs to be adjusted to a preferable pH depending on the type of the printing medium or the like as described later when pretreatment. Used as needed.

Specific examples of the water-soluble resin include oxidized starch, methyl cellulose, hydroxyethyl cellulose,
Examples include carboxymethyl cellulose, tragacanth gum, guar gum, gum arabic, sodium alginate, sodium polyacrylate, polyvinyl alcohol, polyvinylpyrrolidone, polyacrylamide, and casein. Specific examples of the pH adjusting agent include phosphoric acid, hydrochloric acid, sulfuric acid, boric acid,
Silicic acid, acetic acid, carbonic acid, citric acid, tartaric acid, maleic acid,
Phthalic acid, and their alkali metal salts, ammonium salts, triethylamine salts, triethanolamine salts,
And caustic soda, triethanolamine and the like.
The amount of these pretreatment agents applied to the print medium is 0.01 to 30 wt%, preferably 0.05 to 20 wt%, with respect to the print medium. An aqueous solution of the treatment agent can be applied, impregnated, or sprayed.

Further, in the present invention, it is preferable to perform pretreatment with a cationizing agent for the purpose of improving the coloring efficiency of an image. In general, the cationization treatment improves the dyeing efficiency of anionic dyes, and is mainly applied to cotton and rayon to modify the dyeability of acid dyes and improve the dyeing ratio of reactive dyes. Specific examples of such a cationizing agent and a treatment method are disclosed in JP-B-39-5.
986, JP-B-46-40510, JP-A-60-134.
080.

These pretreatments for the print medium of the present invention may be used alone or in combination. For example, a cationized print medium is further treated with a treatment liquid containing a water-soluble resin and, if necessary, a pH adjuster, whereby a printed matter having a higher density and a sharper image can be obtained.

The types of print media used in the invention include cotton, silk, linen, nylon, rayon, acetate,
It is a polyester and a blend thereof, and it is necessary to change the type and pH of the treating agent depending on the type. For example, cotton, silk, hemp, and rayon are controlled to an alkaline pH using an anionic resin, while nylon is controlled to an acidic pH. In the case of acetate and polyester, the pH is preferably near neutral.

Next, a method of performing ink jet printing using the print medium of the present invention will be described. Ink that can be used includes any of reactive dyes, acid dyes, direct dyes, and disperse dyes. That is, the ink used in a general inkjet printer can be used as it is. For printing, a commercially available inkjet printer may be mounted with the print medium of the present invention to perform normal printing. After printing, the object is achieved by heating or steam heating as needed, followed by washing with water and drying.

As the constituent components of the ink, dyes, water, water-soluble organic solvents, pH adjustors, antifungal agents, surfactants, water-soluble resins and the like are used appropriately. Examples of water-soluble organic solvents are glycols, glycol ethers, nitrogen-containing solvents, and the like. Examples of surfactants include nonion,
Any of anionic, cationic and amphoteric activators can be used, and they are properly used according to the purpose.

In the present invention, after printing on one side, it is possible to print on the back side as well. Therefore, a printed product can be obtained by printing on both sides, heating and coloring, then washing with water and drying. it can. More preferably, after printing on one side, it is heated and dried immediately, and then printed on the back side as well, followed by the steps of heating color development treatment, washing with water and drying. In particular, when printing a polyester cloth with a disperse dye, it is preferable to carry out a reduction cleaning after the heat treatment as in a usual printing system.
The reduction cleaning is to remove unreacted dye by reductive decomposition, and is carried out by performing a cleaning treatment with warm alkaline water in which a reducing agent such as hydrotalcite is dissolved.

Conventionally, in the ink jet printing method, it has been difficult to print a color on the back side of a thick print medium by printing on only one side. For example, even with a thin print medium, it is difficult to develop the color on the back surface if the amount of ink ejected during printing is small. However, if the amount of ink to be ejected is increased, the color development on the back surface will be good, but the blurring of the image will be large, and a good image quality cannot be obtained. Therefore, in the ink-jet printing method, the application in which an image needs to be printed on both sides of a print medium is limited to a considerably thin print medium. The present invention made in view of the present situation is a drawback of the inkjet printing method, that is, reverse printing is performed on both sides of the medium to be printed by utilizing the fact that the strike-through coloring is difficult, and the coloring treatment and washing are performed. , Drying is performed.

To explain the present invention in more detail, the inkjet printing is not simply performed on both sides of the medium to be printed, and color development processing is performed later. It is necessary to balance parameters such as the type of print medium, pretreatment conditions, and the amount of ink ejected per unit area, and if this balance is not matched well, images will bleed or images on the front and back will be mixed. ,
Staining due to rubbing easily occurs.

After intensive studies, the inventors of the present invention have found that the amount of ink applied (nl) per surface area of 1 mm ² is 3 nl or more on both the front and back surfaces of the print medium, and the area is 1 mm.
The relationship between the amount of ink applied on one surface per ² (nl) and the thickness of the print medium (μm) is as follows (amount of ink applied per side of 1 mm ² / thickness of print medium) ≤ 0.065 By printing under certain conditions, you can not see through
It was found that a printed product having no image bleeding and an excellent color density can be obtained.

As the printing method of the present invention, any method that can be used as an apparatus for ink-jet printing can be used, and it can be used not only for personal use that can be easily used at home or office but also for industrial production. it can. An example of an inkjet printing / printing apparatus and an industrial method that can be used in the method of the present invention will be described below, but the present invention is not limited to this apparatus and method.

First, an example of an apparatus and method used for personal use in which the present invention is preferably used will be described.

FIG. 1 shows a main part of a constitutional example of an ink jet printing (recording) apparatus of this embodiment. In this figure, the carriage 706 has black, cyan,
An integrated recording head cartridge in which four ink tanks 701 filled with magenta and yellow four dark and light inks and four recording heads 702 for ejecting four colors of ink are integrated is mounted. .

FIG. 1 shows a state in which a print medium according to the present invention is automatically mounted on a pair of conveying rollers in this embodiment. In the conventional inkjet printing apparatus, the platen roller and the print medium are brought into close contact with each other by releasing the member that presses the print medium against the cylindrical platen roller, manually mounting the recording medium, and then pressing the press member again. In many cases, it is difficult to wrap and convey without wrinkles, because it is difficult to align the fabric with the conveying direction due to skewing etc. because it is set manually and it is difficult to perform high-definition inkjet printing. was difficult. Furthermore, it is difficult to stabilize the transportability due to deterioration of pressing force due to repeated use of the release mechanism,
Also, since the mounting operation itself is inferior in operability,
What can be automatically mounted as in this embodiment is preferable.

In FIG. 1, in this embodiment, an inclined feed tray 705 is provided for stable automatic mounting, and the print medium 707 of the present invention is simply inserted along the feed tray. The tip portion thereof is configured to abut against the transport driving roller 703 correctly. By rotating the transport drive roller 703 in this state, the leading end portion of the print medium 707 of the present invention is correctly guided to the pressure contact portion of the transport roller pair and does not cause skewing or wrinkling, which is a transport roller pair. Is automatically attached to. In this embodiment, when the feeding tray is not provided, the leading end portion of the print medium of the present invention may be aligned with the pressure contact portion of the transport driving roller and the transport driven roller, and the transport driving roller may be rotationally driven. . The medium to be printed in the present invention has a conveyance characteristic equivalent to that of plain paper, and other known paper feed resist adjusting mechanism or the like can be applied.

Reference numeral 703 denotes a conveyance driving roller, and a print medium 707 automatically mounted together with a conveyance driven roller 704.
The print medium 707 is fed while being rotated, and the print medium 707 is fed at any time. The carriage 706 stands by at a home position (not shown) when printing is not performed or when multihead recovery work is performed.

Before the start of printing, the carriage 706 at the home position moves on the carriage guide shaft 708 when a print start command arrives, and at a timing based on the read signal of the linear encoder, on the recording head 702. By ejecting ink of each color from the multi-nozzle according to a recording signal, printing is performed on the print medium by a predetermined width. By this recording scan, on the paper surface,
The ink lands and dots are formed. When the printing of the data is completed up to the end of the print medium, the carriage returns to the original home position and the printing of the next line is performed again. From the end of the first printing to the start of the second printing, the transport drive roller 703 rotates to feed the cloth by a predetermined width. In this way, printing of only the recording width of the recording head and cloth feeding are repeated for each scan of the carriage, whereby data printing on one surface is completed.
When the recording is completed, the platen 70 is ejected by the conveying means and simultaneously forms a flat recording surface during printing.
9 is inclined in the discharging direction to assist the discharging of the rear end portion. A means such as a spur roller may be provided on the downstream side of the recording unit in order to assist the ejection and to stably hold the print medium in the recording unit.

As shown in FIG. 2, an example of an ink jet recording apparatus equipped with an automatic feeding mechanism in addition to automatic mounting of a print medium is shown. Further, here, a mechanism for improving the dyeing rate by heating the recording medium after inkjet recording is also provided. Further, a recording mode selection mechanism is provided so that the recording system of the inkjet recording unit is improved so that it can be adapted to a thick print medium.

The feeding mechanism includes a feeding driving rubber roller 902 which is rotatably driven as necessary, a feeding holding plate 901 which holds the print media in layers and which moves up and down as needed, and a tip end of the print media. A separation pad 903 that separates the print medium stacked in contact with each other and a feeding guide 904 that sends the print medium that has been separated and fed to the conveying roller pair.

In response to the feeding signal, first, the feeding and holding plate 901 rises, and the pressing force of the spring member provided on the feeding and holding plate makes the back side of the surface on which printing is performed upside up on the feeding and holding plate. The print medium 707 stacked and held by the feeding drive rubber roller 902 are pressed against each other. When the feeding drive rubber roller is rotationally driven in the feeding direction in that state, the print medium receives the frictional sliding force on the back surface and is fed. At this time, a frictional sliding force is also generated between the stacked print media, so that the print media at the uppermost part in contact with the feeding drive rubber roller are dragged and the ones below the print media also start to be fed at the same time. At the same time, when the leading ends of a plurality of print media that have started to be fed in layers approach the separation pad 903 having a high frictional force, they are sequentially stopped from the lower side, so only one sheet is fed while passing over the separation pad. Will be sent. The separated and fed non-print medium reaches the pressure contact portion of the pair of conveying rollers which is rotationally driven through the feeding guide by the feeding driving roller 902 which continues to rotate, and is automatically mounted on the conveying roller. The feeding and holding plate 901 descends at a timing when automatically attached,
When the feeding force of the feeding drive roller 902 is no longer transmitted to the print medium, the rotation of the feeding drive roller is stopped and the feeding operation is ended. In this example, since the print medium is turned upside down at the feeding guide and turned upside down, the back side of the feeding section is on the upper side, but the recording side is on the upper side when passing the pair of conveying rollers. It has become. Therefore, the method of ejecting ink in the inkjet recording unit is downward. The ink ejection direction differs slightly depending on the ink jet recording method, but is preferably in the range from the downward direction to the lateral direction, and may be sent out in that direction by a feeding guide. Further, the same mechanism as that of a double-sided recording unit used in recent copying machines may be used to upside down the medium once fed on the back side. Further, when the print medium is separated and fed, a known method other than the separation pad method of this example, for example, a nail separation method can be applied, and a feeding drive member is pressed against the back surface side of the recording surface. It may be configured to perform.

The ink jet recording operation itself has almost the same structure and operation as those in the above-mentioned example, and therefore the explanation thereof will be omitted. However, in this example, a heating means is provided on the downstream side of the ink jet recording section, and if necessary, the printing target The medium is heat-treated. As the heating means, basically any heating mechanism conventionally known in the field of printers, copying machines and the like can be applied, but in order to obtain a sufficient effect for improving the dyeing rate which is the objective of this example. It only has to be configured. Further, it is more preferable to adopt a configuration in which heating conditions can be appropriately adjusted / selected according to the configuration of the print medium, the material and thickness of the base fabric, and the like. In this example, an infrared heater 905 with a reflective shade is used as the main heating means, and energization is controlled under a predetermined heating condition in synchronization with the above-described conveyance operation of the print medium accompanying inkjet recording. In this example, it is configured to perform heating from the back side, but depending on the configuration and heating conditions of the heating means, direct heating from the recording side or heating from both sides may be performed. A contact heating method using a heating plate or the like may be used. In this example, as an auxiliary structure of the infrared heating system, a blowing unit (not shown) is provided to prevent heat and steam from staying in the vicinity of the heating unit and to perform stable heating control. Causing a flow.

In the ink jet recording apparatus capable of transporting the print medium shown in this example, the ink ejection amount can be adjusted and selected according to the cloth thickness and material. When recording on plain paper, the maximum amount of ink that can be ejected is limited in terms of reduced resolution, bleeding between colors, strike-through, and increased fixing time. The ejection amount is 16 to 28 nl for water-based ink
In general, it is designed to be contained within about / mm ² . However, in the case of recording (printing) on a print medium as in the present invention, depending on the material and thickness of the base fabric and pretreatment conditions, more ink may be received in some cases. Therefore, in this example, high-density recording at a printing speed lower than the printing speed corresponding to the recording frequency, for example, 1
Ink-jet drive control for double-density recording at a printing speed of / 2, overprinting on the same recording area by a plurality of recording scans, and for increasing the ink ejection amount, for example, a thermal insulation temperature for a thermal inkjet head. Or raise
By performing the multi-pulse driving, it is possible to increase the amount of ejected ink as needed.
In this example, if the print mode is designated as thick cloth on the operation panel 906, 300% printing is performed for all colors in which the same recording area is overprinted three times.
%, And 100% for all colors on plain paper. Therefore, it is possible to select the optimum printing condition according to the cloth.

Regarding the method of using the method of the present invention for industrial production, an example of a specific method of use will be described.

FIG. 3 is a block diagram showing the basic construction of an ink jet recording apparatus when applied to the method of the present invention. This inkjet recording apparatus is configured as a system, and is roughly classified into an image reading apparatus 1 that reads an original image created by a designer or the like and converts the original image into original image data represented by an electric signal, and original image data from the image reading apparatus 1. The image processing section 2 takes in, processes and outputs as image data, and the image recording section 3 which records on a recording medium such as cloth based on the image data created by the image processing section 2. Image reading device 1
Then, the original image can be read by the CCD image sensor. The image processing unit 2 ejects four color inks, which will be described later, of magenta (abbreviation M), cyan (abbreviation C), yellow (abbreviation Y), and black (abbreviation Bk) from the input original image data. -2 (FIG. 4) to generate data. At the time of creating the data, image processing for reproducing the original image with ink dots, color arrangement for determining the color tone, modification of the layout, processing of the pattern size such as enlargement and reduction, and selection are made. In the image recording unit 3, recording is performed by the inkjet recording unit A-2. The inkjet recording unit A-2 is for recording by ejecting minute ink droplets toward a recording medium and attaching the ink droplets to the recording medium.

FIG. 5 is a perspective view showing a print section of the ink jet recording apparatus used in the present invention.

First, the ink jet printing section is roughly classified into a frame frame 6, two guide rails 7 and 8, an ink jet head 9 and a carriage 10 for moving the same, an ink supply device 11 and a carriage 12 for moving the same, and a head recovery device 13. And a transmission system 5. The inkjet head 9 (hereinafter, simply referred to as a head) is
It includes a plurality of nozzle arrays and a conversion device for converting electrical signals into ink ejection energy, and has a mechanism for selectively ejecting ink from the nozzle arrays according to the image signals sent from the image processing unit 2. The head is a recording head that ejects ink by using heat energy, and includes a heat energy converter for generating heat energy to be applied to the ink, and heat applied by the heat energy converter is used. A head that causes a state change in the ink by energy and ejects the ink from the ejection port based on the state change is preferably used.

The ink supply device 11 stores ink,
It is for supplying a required amount of ink to the head, and has an ink tank, an ink pump, and the like, which are not shown. The main body and the head 9 are connected by an ink supply tube 15, and normally the head 9 is automatically supplied only by the amount ejected from the head by a capillary action. In addition, in a head recovery operation as described below, ink is forcibly supplied to the head 9 using an ink pump. The head 9 and the ink supply device 11 are mounted on the carriage 10 and the carriage 12, respectively, and are configured to reciprocate along the guide rails 7 and 8 by a driving device (not shown).

The head recovery device 13 is provided at a position that can face the head 9 at the home position (standby position) of the head 9 in order to maintain the ink ejection stability of the head, and can move forward and backward in the direction of arrow A. Specifically, the following operation is performed.

First, the head 9 is capped at the home position to prevent evaporation of ink from the nozzles of the head 9 during non-operation (capping operation).
Alternatively, an operation of pressurizing the ink flow path in the head by using an ink pump to forcibly eject ink from the nozzles in order to eject air bubbles, dust, etc. into the nozzles before starting image recording (pressure recovery operation) Alternatively, it performs a function of collecting the ejected ink when performing the operation of forcibly sucking and ejecting the ink from the nozzle (suction recovery operation).

The power transmission system 5 includes a power supply unit and a control unit for performing sequence control of the entire ink jet recording unit. Each time the head 9 moves along the guide rails in the main scanning direction to perform recording for a predetermined length, the cloth 36 is conveyed by a predetermined amount in the sub-scanning direction (arrow B direction) by a conveying device (not shown) to form an image. It will be done. In the figure, the shaded area 17 indicates the portion where the recording is completed.

As the recording head 9, a plurality of recording heads for recording a single color, an inkjet recording head for recording with different color inks for color recording, or a plurality of recording heads for recording with dark and light inks having the same color but different densities. A recording head or the like can be used. In addition, it is applicable regardless of the configuration of the recording means and the ink tank, such as a cartridge type in which the recording head and the ink tank are integrated, or a configuration in which the recording head and the ink tank are separated and connected by an ink supply tube. can do.

FIG. 4 is a schematic view showing the outline of an image recording unit particularly preferable for the present invention. This recording apparatus is roughly divided into a feeding section B for feeding a print-receiving medium such as a roll-shaped cloth which has been subjected to a pretreatment for printing, and a feeding line for the sent print-receiving medium with precision. It is composed of a main body portion A for printing with an inkjet head and a winding portion C for drying and winding the printed printing medium. The main body portion A further includes a precision feeding portion A-1 for the print medium including a platen and an inkjet recording portion A-2.

The pre-processed roll-shaped print medium cloth 36 is sent out from the benefit section B and sent to the main body section. A thin endless belt 3 that is precisely step-driven on the main body
7 is wound around a drive roller 47 and a winding roller 49. The driving roller 47 is directly step-driven by a high-resolution stepping motor (not shown) to step-feed the belt by the step amount. The sent cloth 36 is pressed by the pressing roller 40 against the surface of the belt 37 backed up by the winding roller 49,
It is stuck.

The cloth 36, which has been step-fed by the belt, is positioned by the platen 32 on the back surface of the belt in the first printing section 31 and printed by the ink jet head 9 from the front side. Each time one line of printing is completed, a predetermined amount of step feed is performed, then heating from the back surface of the belt by the heating plate 34 and warm air duct 35
It is dried by the hot air from the surface supplied / exhausted by. Then, in the second printing unit 31 ', the overprinting is performed in the same manner as the first printing unit. The printed cloth is peeled off, dried again in the same post-drying section 46 as the above-mentioned heating plate and warm air duct, guided to the guide roll 41, and taken up by the take-up roll 48. Then, the wound cloth is removed from the apparatus, and the product is subjected to post-treatment steps such as color development, washing, and drying in batch processing.

Next, details of the vicinity of the ink jet recording section A-2 will be described with reference to FIG. The preferable mode here is that the head of the first printing unit thins out the number of dots to record information, and after the drying process, the head of the second printing unit complements the information thinned out in the first printing unit. Ink droplets are ejected as described above.

In FIG. 6, the cloth 36 as a recording medium is used.
Is attached to a belt and is step-fed upward in the figure. First print unit 3 in the lower part of the figure
In addition to Y, M, C, and Bk, the first carriage 4 includes eight inkjet heads for special colors S1 to S4.
There is 4. The ink jet head (recording head) in this example uses an element having an element that generates thermal energy that causes film boiling of the ink, as energy used for ejecting the ink, and is 400d.
An array of 128 ejection ports with a density of pi (dots / inch) is used.

On the downstream side of the first printing section, a drying section 45 consisting of a heating plate 34 for heating from the back side of the belt and a warm air duct 35 for drying from the front side is provided. The heat transfer surface of the heating plate 34 is pressed against the strongly tensioned endless belt 37, and the high temperature and high pressure steam passing through the hollow inside strongly heats the conveyor belt 37 from the back surface. Conveyor belt 37
Effectively heats the stretched fabric 36 directly by heat conduction. The inside of the heating plate surface is provided with fins 34 'for collecting heat so that the heat can be efficiently concentrated on the back surface of the belt. The side not in contact with the belt is covered with a heat insulating material 43 to prevent loss due to heat dissipation.

On the front side, dry warm air is blown from the supply duct 30 on the downstream side so that air having a lower humidity is applied to the cloth which is being dried to enhance the effect. The air flowing in the direction opposite to the cloth conveying direction and containing a sufficient amount of water is sucked from the suction duct 33 on the upstream side by a much larger amount than the blowing amount, so that the evaporated water leaks and the surrounding air is leaked. Avoid condensation on mechanical devices. The hot air supply source is on the back side of FIG. 4, and suction is performed from the front side, so that the pressure difference between the blowing port 38 and the suction port 39 facing the cloth is uniform over the entire longitudinal direction. It is designed to be. The air blower / sucker is offset downstream from the center of the back heating plate so that the air hits where it has been sufficiently heated. With these, a large amount of water in the ink is strongly dried. A second print unit 31 'is located downstream (upper) thereof, and a second print unit 31' having the same configuration as the first carriage forms the second print unit.

As shown in FIG. 4, after the ink jet printing process, it is dried (including natural drying). And
Subsequently, a step of diffusing the dye on the fabric fiber and reacting and fixing the dye on the fiber is performed. By this step, it is possible to obtain sufficient color development and fastness due to dye fixation.

[0046]

EXAMPLES Next, the present invention will be described more specifically with reference to examples.

Example 1 Cotton (thickness: 250 μm) treated with trimethyl-2hydroxy-3chloropropylammonium chloride as a reactive quaternary amine compound as a cationizing agent.
m) was impregnated with a 0.2% aqueous solution of carboxymethyl cellulose (squeezing ratio: 90%) and dried to obtain a print medium of the present invention. This is cut out to the size of A4 size, and a commercial inkjet color printer (Canon BJC
-820J) was used to perform multicolor printing on both front and back surfaces. Immediately after completion of printing, after ironing, the plate was thoroughly washed with a 0.1% aqueous solution of sodium dodecylbenzenesulfonate, two cloths were peeled off, and then dried. A color image of sufficient density was vividly printed on both sides of the cotton. In addition, a sharp image was obtained without stains on the white part to which the ink did not adhere. In this example, (amount of ink ejected on one side per area of 1 mm ² / thickness of print medium) (hereinafter abbreviated as α value) was 0.06.

Example 2 A plain weave cotton cloth having a thickness of 270 μm was impregnated with an aqueous solution containing 1.0% of sodium alginate and 0.6% of sodium carbonate to dry (squeeze ratio: 90%), and then the A2 plate was used. It was cut into a sheet of the size. The loose thread on the cut portion was burned down by the flame of a gas burner. Then, using a commercially available inkjet color printer (BJC-440 manufactured by Canon Inc.), full color printing was performed on the front and back sides with the inks shown below. Immediately after printing the table, it was colored at 80 ° C. for 5 minutes, then washed with water and dried. A color image of sufficient density was vividly printed on the obtained cotton cloth. Also, a sharp image was obtained without image unevenness due to poor conveyance of the cloth and stains on the white part. The α value in this example was 0.052.

Ink Composition Cyan Ink C.I. I. Reactive Blue 15 13 parts Thiodiglycol 20 parts Ethylene glycol 15 parts Ion-exchanged water 52 parts Magenta ink C.I. I. Reactive Red 226 10 parts Thiodiglycol 20 parts Diethylene glycol 10 parts Ion-exchanged water 60 parts Yellow ink C.I. I. Reactive Yellow 95 10 parts Thioglycol 20 parts Diethylene glycol 15 parts Ion-exchanged water 55 parts Black ink C.I. I. Reactive Black 39 9 parts Thioglycol 20 parts Ethylene glycol 15 parts Ion-exchanged water 56 parts The above four inks are mixed with a stirrer and adjusted to pH 7.0 with sodium hydroxide, and then filtered with a fluoropore filter. Used.

Example 3 Bad treatment (squeeze ratio: 70%) with an aqueous solution containing 1.0% of sodium alginate and 10% of urea to a thickness of 260 μm.
m polyester printed medium was prepared. Then 4
Using a commercially available inkjet color printer (BJC-440 manufactured by Canon Inc.), it was cut into a roll having a width of 2 cm, and full-color printing was performed on the front and back with the ink containing the disperse dye shown below. Immediately after the completion of printing, the printed portion was cut off and color-developed for 8 minutes with superheated steam at 160 ° C. Next, after undergoing reduction washing and water washing steps, it was dried. A color image of sufficient density was vividly printed on the front and back of the obtained polyester print medium. In addition, a sharp image was obtained without stains on the white part to which the ink did not adhere. The α value in this example was 0.058. Ink composition Cyan ink C.I. I. Disperse Blue 87 7 parts Sodium lignin sulfonate 1 part Thiodiglycol 15 parts Triethylene glycol 15 parts Deionized water 62 parts Magenta ink C.I. I. Disperse Red 92 6 parts Sodium lignin sulfonate 1 part Thiodiglycol 15 parts Triethylene glycol 15 parts Ion-exchanged water 63 parts Yellow ink C.I. I. Disperse Yellow 93 6 parts Sodium lignin sulfonate 1 part Thiodiglycol 15 parts Triethylene glycol 15 parts Ion-exchanged water 63 parts Black ink C.I. I. Disperse Black 39 8 parts Sodium lignin sulfonate 1 part Thioglycol 15 parts Triethylene glycol 15 parts Ion-exchanged water 61 parts The above components were mixed and dispersed using a sand grinder, and filtered through a filter before use.

Example 4 A nylon print medium impregnated with an aqueous solution containing 1.5% oxidized starch and 0.05% citric acid (squeezing ratio: 70%) was prepared. This was cut into a size of A3 plate, and multi-color printing was performed on both front and back sides using a commercially available inkjet color printer (BJC-820J manufactured by Canon). 102 ℃ immediately after printing
Was subjected to color development treatment for 8 minutes with superheated steam, followed by washing with water and drying. A color image of sufficient density was vividly printed on the front and back of the obtained nylon print medium.
In addition, a sharp image was obtained without stains on the white part to which the ink did not adhere. The α value in this example is 0.06.
Met.

Comparative Example 1 A print medium was obtained in the same manner as in Example 2 except that a plain weave cotton cloth having a thickness of 200 μm was used instead of the cotton cloth having a thickness of 270 μm used in Example 2. Multi-color printing was performed using an inkjet printer (BJC-820J made by Canon). After printing, the same process as in Example 2 was carried out to obtain a printed material. Although a color image having a sufficient density was obtained on the cotton cloth, the image on the front side of the cloth and the image on the back side of the cloth fell out of the front side and were mixed, and only an impractical printed matter was obtained. The α value in this comparative example was 0.075.

[0053]

As described above, according to the present invention,
It is possible to print high-quality images without bleeding on both sides of the print medium. Further, according to the present invention, a clear printed material having a high color density can be obtained even if it is directly applied to a commercial inkjet printer for office or personal use. Further, according to the present invention, textile printing can be performed on both sides of a print medium at low cost by a simple process.

[Brief description of drawings]

FIG. 1 is a main configuration diagram of an example of an inkjet recording apparatus that can be used in the present invention.

FIG. 2 is a main configuration diagram of an example of an inkjet recording apparatus that can be used in the present invention.

FIG. 3 is a block diagram showing the basic configuration of the present invention.

FIG. 4 is a diagram showing a configuration of an image recording unit according to an embodiment of the present invention.

FIG. 5 is a perspective view showing a print unit of the embodiment.

FIG. 6 is a diagram showing the vicinity of the inkjet recording unit of the embodiment.

[Explanation of symbols]

 701 Ink tank 702 Recording head 703 Conveyance drive roller 704 Conveyance driven roller 705 Feed tray 706 Carriage 707 Printed medium 708 Carriage guide shaft 709 Platen 901 Feed holding plate 902 Feed drive roller 903 Separation pad 904 Feed guide 905 Reflector Infrared heating device 906 Paper discharge tray 907 Operation panel A Main body A-1 Precision feeding part A-2 Inkjet recording part B Cloth feeding part C Winding part 9 Inkjet head 30 Supply duct 31 First printing part 31 'Second printing Part 33 Suction Duct 34 Heating Plate 35 Warm Air Duct 36 Cloth 37 Belt 38 Outlet 39 Suction Port 40, 41, 47, 48, 49 Roller 44 First Carriage 44 'Second Carriage 45 Drying Part 46 Post Drying Part 5 Feeding system 6 framework 7,8 guide roll 9 inkjet head 10 the carriage 11 the ink supply device 12 carriage 13 head recovery device 15 the tube 17 recorded portion

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Tomoya Yamamoto 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Fumi Takade 3-30-2 Shimomaruko, Ota-ku, Tokyo Kya Non-Incorporated (72) Inventor Mariko Suzuki 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc.

Claims (3)

[Claims] 1. A single-sided ink per 1 mm ² area on both front and back surfaces of a print medium that has been pretreated with a treatment agent containing at least a water-soluble resin and, if necessary, a pH adjusting agent, and / or a cationization treatment agent. Driving amount (n
l) is not less than 3 nl, moreover ink discharge amount of one surface per area 1 mm ² (nl) and the thickness of the printing medium ([mu] m) on one side of the ink landing amount per ² following relationship (area 1 mm / target An ink jet printing method comprising: performing ink jet recording under conditions such that (printing medium thickness) ≦ 0.065, then performing color development, washing with water, and drying. 2. The ink-jet printing method according to claim 1, wherein the medium to be printed is cotton, silk, linen, rayon, acetate, nylon, polyester fiber or a mixture thereof. 3. The ink-jet printed material obtained by the method according to claim 1, wherein both sides of the print medium are color puddings.