JP2003165203A - Ink jet recorder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ink jet recorder in which generation of paper powder incident to traveling of a recording sheet is prevented while exhibiting high stability of intermittent ejection (rejection properties after ejection pause time) in a print head. <P>SOLUTION: A recording sheet 2 to be printed is coated with water at a liquid coating section 3 so that powdery dust, e.g. paper powder, supported on the recording sheet 2 is not blown up in a container 5 containing a print head 1. The recording sheet 2 coated with water is thermally dried on a preheat plate before being printed by means of the print head 1 and water applied to the recording sheet vaporizes when the recording sheet is thermally dried and ascends to increase humidity in the vicinity of the print head 1. Consequently, paper powder generated from the recording sheet 2 is prevented from depositing in the vicinity of an ink ejection nozzle hole thus preventing reaction on an ink material or aggregation of coloring agent contained in the ink material. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet recording apparatus for ejecting ink droplets onto recording paper to form recording dots, and more particularly to suppressing generation of paper dust from the recording paper and performing stable printing for a long time. The present invention relates to an ink jet recording apparatus that can be performed.

[0002]

2. Description of the Related Art As recording paper for an inkjet recording apparatus, recycled paper is often used in addition to inkjet-dedicated paper for improving image quality. These recycled papers and inkjet-dedicated papers generate a large amount of paper dust, and even other papers have a large amount of paper dust attached. Paper dust is also generated by contact with the paper transport roller.

Therefore, many proposals for preventing paper dust have been made conventionally. For example, JP-A-11-03518
No. 6 discloses a method of disposing a paper dust suction tube communicating with a suction fan in the vicinity of the recording head and removing the paper dust adhering to the paper every time it is conveyed. Patent No. 279671
No. 9 proposes to remove the paper dust adhering to the paper feed roller with a cleaning tool having an adhesive layer. Further, Japanese Patent Application Laid-Open No. 11-123811 describes a method of applying a liquid on the surface of paper and removing the liquid and paper dust with a blade.

[0004]

However, none of the methods has been able to prevent the generation of paper dust to a sufficient level. When paper dust is introduced into the inkjet recording apparatus, various problems occur. Specifically, when paper dust generated from recording paper accumulates near the ink ejection nozzle holes, it causes reaction with the ink material, aggregation of the colorant, and thickening of the ink, resulting in non-ejection of ink. However, there is a problem that the image quality is deteriorated. Such a problem remarkably appears in a nozzle having a long ink ejection interval.

The present invention has been made in view of the above problems, and an object of the present invention is to prevent the generation of paper dust accompanying the running of a recording medium and to stabilize the intermittent ejection in the recording head ( It is an object of the present invention to provide an inkjet recording device having a good re-ejection property after the ejection rest time.

[0006]

An ink jet recording apparatus according to claim 1, which is made to achieve the above object, comprises:
Liquid application means for applying liquid to the recording paper, heating and drying means for heating and drying the recording paper, and ink droplets are ejected onto the recording paper heat-dried by the heating and drying means to form recording dots. It is characterized in that it is provided with a print head and a paper transport means for moving the recording paper relative to the print head.

In the ink jet recording apparatus having such a structure, by applying a liquid to the recording paper before printing, dust such as paper powder carried by the recording paper is prevented from rising.
Prevents dust from adhering to the nozzle surface of the print head. The recording paper on which the liquid is applied is heated and dried for printing, but the heating and drying vaporizes the liquid applied on the recording paper, and the humidity in the vicinity of the print head is increased due to the evaporation.

According to a second aspect of the present invention, there is provided an ink jet recording apparatus according to the first aspect, further comprising means for guiding the vapor of the liquid applied to the recording paper resulting from the heating and drying means to heat and dry the recording paper to the vicinity of the print head. It is characterized by further provision.

Since the vapor of the liquid applied to the recording paper moves upward due to its nature, the vapor of the liquid applied to the recording paper is not always necessary in the ink jet recording apparatus in which the print head is located above the liquid applying means. However, in an inkjet recording apparatus having an arrangement different from that described above, the humidity in the vicinity of the print head can be reliably increased by providing such means.

According to a third aspect of the present invention, in the ink jet recording apparatus according to the first or second aspect, the liquid applying unit applies the liquid to the recording paper heated and dried by the heating and drying unit, and the liquid is applied. It is characterized in that the recording paper is further heated and dried by the heating and drying means.

In the ink jet recording apparatus having such a structure, the recording paper is first heated and dried, and the liquid is applied onto the recording paper. Therefore, the applied liquid easily evaporates, and after the liquid is applied, the heating and drying means is applied. Since the recording paper is heated and dried in 1., vaporization of the applied liquid is accelerated, and the relative speed between the recording paper and the print head can be improved.

According to a fourth aspect of the invention, there is provided the ink jet recording apparatus according to any one of the first to third aspects,
The relative humidity near the print head is 40 RH% or more.

The relative humidity near the print head is set to 40 RH.
When the content is at least%, it is possible to prevent the generation of paper dust and perform printing with excellent ejection reliability, particularly intermittent ejection performance.

According to a fifth aspect of the present invention, there is provided an ink jet recording apparatus having the structure according to any one of the first to fourth aspects.
The liquid to be applied is characterized by containing at least one of water and an organic solvent.

When water is applied, it is preferable to use distilled water, and when a liquid obtained by mixing water and an organic solvent is applied, if the organic solvent has a lower boiling point and a lower vapor pressure than water, high speed is achieved. It is possible to support printing.

According to a sixth aspect of the present invention, there is provided an ink jet recording apparatus according to any one of the first to fifth aspects.
It is characterized by further comprising a heater for controlling the temperature of the liquid to be applied.

When the temperature of the applied liquid is raised by using the heater, the applied liquid is easily evaporated, and high speed printing can be realized.

According to a seventh aspect of the present invention, there is provided an ink jet recording apparatus having the structure according to any one of the first to sixth aspects.
The printing is performed at a recording speed such that the relative speed between the print head and the recording paper is 10 inches / second (ips) or more.

As described above, in the ink jet recording apparatus having a structure compatible with high speed printing, it becomes possible to print at a recording speed of 10 inches / second (ips) or more as a relative speed between the print head and the recording paper. .

According to an eighth aspect of the present invention, in the ink jet recording apparatus according to the seventh aspect, the print head is
It is characterized by being a line type in which a plurality of ink nozzles are arranged in parallel so as to cover the entire width direction of the recording paper.

In the line type print head, since the ink nozzles for ejecting ink are arranged in parallel so as to cover the entire width direction of the recording paper, high speed printing is possible,
Therefore, it is most preferable as a print head used in an ink jet recording apparatus compatible with high speed printing.

According to a ninth aspect of the invention, there is provided the ink jet recording apparatus according to the eighth aspect, wherein the recording paper is continuous paper.

From the viewpoints of speeding up and mass printing, it is preferable to use continuous paper as the recording paper when the line type print head is adopted as described above.

An ink jet recording apparatus according to a tenth aspect of the present invention is the ink jet recording apparatus according to any one of the first to ninth aspects,
It features double-sided printing at the same time.

By arranging, for example, the structure described in claim 1 on both sides of the recording paper, it becomes possible to perform double-sided printing at the same time.

[0026]

DETAILED DESCRIPTION OF THE INVENTION An inkjet printer according to an embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a schematic configuration diagram of an ink jet recording apparatus 100 according to the first embodiment. In the present embodiment and the second to sixth embodiments described below,
Continuous paper is used as the recording paper 2. Perforations are punched in the width direction at regular intervals in the recording paper 2 which is a continuous paper, and the recording paper 2 is stored in the paper supply unit 7 in a state of being alternately folded at the perforations. The recording paper 2 pulled out from the paper supply unit 7 is upward between the paper conveying rollers 9A and 9B, and horizontally between the guide rollers 10A and 10B.
Then, the sheet is conveyed downward by the sheet conveying roller 9C and accumulated on the sheet stacker unit 8.

On the left side between the paper transport rollers 9A and 9B,
Liquid application section 3 for applying liquid to one side of recording paper 2
However, the print head 1 is arranged on the downstream side. A hygrometer 6 is arranged near the print head 1. The print head 1, the liquid application unit 3, and the hygrometer 6 are housed inside a box-shaped container 5, and the paper transport rollers 9A and 9A so that the recording paper 2 covers the open surface of the container 5.
B is positioned. Therefore, the print head 1,
The liquid application part 3 and the hygrometer 6 are arranged in a substantially closed space partitioned by the container 5 and the recording paper 2. However, an opening / closing opening 52 is formed in the humidity control frame 51 forming the upper side surface of the housing 5, and a slide 53 covering the opening / closing opening 52 is slid to adjust the degree of sealing inside the housing 5. You can do it.

A preheat plate 4 for heating the recording paper 2 is arranged at a position facing the storage body 5 with the recording paper 2 in between. The preheat plate 4 is arranged so that its heat emitting surface faces the space between the print head 1 and the liquid application unit 3. Further, the heat radiating surface of the preheat plate 4 has a length which is approximately the same as the width of the recording paper 2.
Heats the entire surface of the recording paper 2 from the side opposite to the liquid application surface while moving from the liquid application unit 3 to the print head 1.

Next, the operation of the ink jet recording apparatus 100 configured as above will be described.

Recording paper 2 delivered from paper supply unit 7
Is applied with liquid on one side by the liquid applying section 3. The recording paper 2 is heated by the preheating plate 4 while the recording paper 2 coated with the liquid is conveyed to the print head 1. When the recording paper 2 is heated, the applied liquid is vaporized and vapor rises and is guided to the nozzle surface of the print head 1. As a result, the humidity near the nozzle surface of the print head 1 increases. The humidity can be set to a desired value by observing the hygrometer 6 and adjusting the liquid application amount of the liquid application unit 3 and the area of the opening / closing port 52 provided on the upper portion of the humidity control frame 51.

The recording paper 2 coated with the liquid is dried by passing through the preheat plate 4, and after forming an image by the ink droplets ejected from the print head 1, it is conveyed to the paper stacker unit 8.

FIG. 2 is a partially enlarged view showing the internal structure of the housing body 5 of the ink jet recording apparatus according to the second embodiment of the present invention.

In the first embodiment shown in FIG. 1, the preheat plate 4 is arranged at a position facing the storage body 5 with the recording paper 2 in between, but in the second embodiment, the preheat plate 4 is arranged. ,
Instead of the preheat plate 4, a dry blower 14 is arranged between the liquid application section 3 and the print head 1. The other configuration is the same as that of the first embodiment.

The operation is basically the same as that of the first embodiment, except that the recording sheet 2 is directly heated and blown from the liquid application surface by the heating blower 14 as a heating means.

FIG. 3 is a partially enlarged view showing the internal structure of the housing 5 of the ink jet recording apparatus according to the third embodiment of the present invention.

The third embodiment and the first embodiment shown in FIG. 1 have the same basic structure, but the third embodiment uses a liquid application roller 13 in the liquid application section. Is different from the first embodiment. The other configuration is the same as that of the first embodiment.

FIG. 4 is a partially enlarged view showing the internal structure of the housing body 5 of the ink jet recording apparatus according to the fourth embodiment of the present invention.

In the present embodiment, the liquid application roller 13 is used as in the third embodiment, and the second application shown in FIG.
Similar to the embodiment described above, a drying blower 14 is provided between the liquid applying roller 13 and the print head 1. The other configuration is the same as that of the first embodiment.

FIG. 5 is a partially enlarged view showing the internal structure of the housing body 5 of the ink jet recording apparatus according to the fifth embodiment of the present invention. This embodiment is the same as the first embodiment shown in FIG.
It is a modified example of the embodiment, and has a configuration for high-speed printing. The basic configuration is the same as that of the first embodiment,
The heat radiation area of the preheat plate 4 is expanded as compared with the first embodiment. That is, in the present embodiment, the heat radiation surface of the preheat plate 4 is extended so that the recording paper 2 in the range from the downstream side position of the liquid application unit 3 to the print head 1 can be heated.

The recording sheet 2 is conveyed as in FIG.
The recording paper 2 passes through the liquid application section 3 while being heated by the preheat plate 4, and an image is formed by the print head 1.
Since the liquid is applied to the recording paper 2 which is heated in the liquid applying section 3, the applied liquid is easily vaporized,
Even if the recording paper 2 is conveyed at high speed, the recording paper 2 can be dried and the high humidity state of the nozzle surface of the print head 1 can be maintained.

FIG. 6 is a partially enlarged view showing the internal structure of the container 5 of the ink jet recording apparatus according to the sixth embodiment of the present invention.

The present embodiment is a double-sided printing type ink jet recording apparatus in which the configuration of the second embodiment shown in FIG. 2 is arranged on both sides of the recording paper 2 in between.

In the present invention, as in the above-described embodiment, the liquid applying section 3 as the liquid applying means applies the liquid uniformly on the entire surface of the recording paper 2 to reduce the generation of paper dust from the recording paper 2. ing. The liquid may be applied in a mist state by spraying or ultrasonic waves, or may be applied by using a print head different from the recording head. Further, the liquid may be applied by a contact method using the liquid applying roller 13 which is also a liquid applying means.

The preheating plate 4, which is a heating and drying means, may heat the recording paper 2 in contact with the recording paper 2, or may heat the recording paper 2 in a state of being separated from the recording paper 2. Further, the dry blower 14 which is also a heating means may be one that blows hot air onto the recording paper 2 or one that heats by radiating infrared rays or the like.

The temperature suitable for drying varies depending on the printing speed, but the settability of the high boiling point organic solvent (apparently the time until it becomes a dry state. Specifically, even if the finger or paper is lightly pressed, the ink Until it becomes a state where it is not transferred)
For improvement, it is generally desirable that the temperature is 80 ° C or higher. However, if the temperature is too high, when the recording sheet 2 stops running, smoke from the recording sheet 2 or discoloration of the recording sheet 2 occurs.
It is preferably 180 ° C or lower.

With a nozzle having a long ejection interval, ink is likely to be dried or thickened regardless of the presence or absence of paper dust, and ink may not be ejected even when an electric signal for ejecting ink is applied. In order to avoid such a situation, in the present invention, the recording paper 2 is coated with a liquid, and the recording paper 2 coated with the liquid is heated to set the relative humidity in the vicinity of the print head 1 to 40 RH% or more. . The relative humidity in the vicinity of the print head 1 is preferably 45 RH%
As described above, more preferably 50 RH% or more.
This is because the ink drying speed in the vicinity of the ink meniscus of the nozzle having a long ejection interval is slowed down, and the increase in ink viscosity is reduced.

In order to slow the drying speed of the ink and reduce the viscosity of the ink, it is effective to combine a method of finely moving the ink meniscus to the extent that the ink is not ejected. This is because the dried or thickened ink in the vicinity of the meniscus can be agitated and discharged stably. The fine movement method is not particularly limited, but it is preferable to perform pressure control and pressure reduction control so that ink is not ejected.
Although the fine movement may be continued during the ejection interval, it may be preferable to perform the fine movement immediately before the ejection because the contact area with the air layer becomes large and the drying of the ink may be promoted.

In the above-described embodiment in which the print head 1 is arranged above the liquid application section 3 and the drying blower 13, no means for guiding the liquid vapor to the vicinity of the print head is provided, but it is separately applied to the recording paper 2. A means for guiding the vaporized liquid vapor to the vicinity of the print head 1 may be provided.

The humidity control frame 51 and the slide 53 for efficiently controlling the humidity may be made of metal or plastic so long as rust does not occur due to contact with water.

The ink jet recording apparatus of this embodiment is an on-demand type and is provided with a line type recording head, in which the print head 1 is fixed and the recording paper 2 is used.
Is configured to move, but a print head having another configuration may be used. For example, it may be a serial type recording head in which the print head moves vertically in the paper feeding direction to sequentially perform recording and intermittently feed the paper.

The printing speed is directly related to the nozzle ejection frequency and the printing resolution. For example, the paper feed speed of the line type recording or the head moving speed (that is, the recording speed) V of the serial type is represented by V = f / R by the ejection frequency f of the ink droplet and the recording resolution R. The present invention is at least 1
It can be effectively used in high-speed recording of 0 ips or more, preferably 15 ips or more, and more preferably 20 ips or more. Particularly, in the ink jet apparatus for high speed printing, in which the print head 1 for ejecting ink droplets is fixed during printing and the recording paper 2 is continuous paper as in the above embodiment, the printing speed is reduced. This is extremely effective because it can reduce the number of times of printing interruptions such as preliminary ejection which is a cause.

The liquid applied to the recording paper 2 may be any liquid containing at least one of water and an organic solvent. The organic solvent is not particularly limited, but high-speed printing can be achieved by mixing an organic solvent having a boiling point and a vapor pressure lower than that of water. This is because, even in the process of forming recording dots, if a large amount of the applied liquid remains, it may cause deterioration of print quality such as ink bleeding or strike-through on the back surface of the recording paper. boiling point,
This is because it is effective to mix an organic solvent having a low vapor pressure. For example, acetone, methyl ethyl ketone, methyl isobutyl ketone, ketones such as methanol, ethanol, isopropanol and lower alcohols can be used alone or as a mixed solvent.

In order to further increase the speed, it is desirable to provide the heater shown in FIG. 5 and to control the temperature of the liquid to be applied. This can be achieved by heating the temperature of the liquid to be applied to room temperature or higher. In FIG. 5, the recording paper 2 is warmed to room temperature or higher by the preheat plate 4 and reaches the liquid application section 3. At this time, the vapor of the liquid can be efficiently generated by heating the temperature of the applied liquid to room temperature or higher. Even in a high-speed printing apparatus, the distance between the liquid application unit 3 and the print head 1 can be shortened, and the size of the apparatus can be prevented from increasing.

Further, by adopting the configuration as shown in FIG. 6, it is possible to perform double-sided printing at the same time. In this case, since both sides of the recording paper are processed in the same process, it is possible to prevent the paper from curling during the conveyance and to stably convey the recording paper.

Next, specific examples of the present invention will be described.

Examples 1 to 5 35 parts by weight of purified water, 60 parts by weight of glycerin (manufactured by Wako Pure Chemical Industries), and ethylene glycol monoisobutyl ether (manufactured by Wako Pure Chemical Industries) 5
1 part by weight, and further mixed with an aqueous pigment dispersion (Cabot Specialty Chemicals IJX266, pigment content 1
4.4% by weight) was mixed so that the pigment concentration was constant, and 300 g of the total composition was homogenized (HG30 manufactured by Hitachi Koki).
Was dispersed at a rotation speed of 2,000 rpm until a homogeneous mixture was obtained, and further filtered to remove impurities and the like to obtain a homogeneous ink composition. As a result of measuring the ink viscosity at 25 ° C. using a rotational viscometer (ELD model manufactured by Tokimec), it was 6.1 mPa · s.

Water is used as a liquid to be applied, and a quick-spray EH-53 (manufactured by AS ONE Co., Ltd.) is used to make a recording sheet 2.
Applied on top. The water used may be ordinary tap water, but distilled water was used in this example. The paper heating means is
A preheater portion of a laser beam printer (LB16 manufactured by Hitachi Koki) was extracted and used. Preheater surface temperature 95
The temperature was set to ± 5 ° C and heating was performed so that the paper temperature was 80 ° C or higher. In addition, direct plate making machine (SJ manufactured by Hitachi Koki
02A) head part is extracted, fixed and used for printing.
Maximum ink ejection frequency 6 kHz, paper feed speed 10i
As ps, printing was performed at a resolution of 600 (× 600) dpi. As recording paper, recycled paper NIP1500RG
T (made by Kobayashi recording paper) was used.

In this embodiment, since the print head is installed above the liquid application section, the means for guiding the vapor of the liquid to the vicinity of the print head is omitted. However,
A humidity control frame 51 made of acrylic resin was installed in order to efficiently control the humidity. The humidity in the vicinity of the print head was measured by setting the sensor part of the T-and-D temperature / humidity meter TR-72S at a position about 2 mm below the head part.

By changing the amount of liquid to be applied and changing the area of the opening / closing port 52 installed on the upper surface of the humidity control frame 51, the humidity (1 ... 50 RH%, 2 ... 70R) shown in Table 1 can be obtained.
H%, 3 ... 56 RH%, 4 ... 40 RH%, 5 ... 45 RH
%) And the experiment was performed.

Recording was performed after the discharge interval of 10 minutes, and it was confirmed whether or not a non-discharge nozzle was generated. Furthermore, 10
Observe the vicinity of the nozzle hole of the print head after printing for
It was confirmed that no paper dust was attached. The evaluated results are shown in Table 1.

Examples 6 and 7 Commercially available cyan inks for inkjet were extracted. As a result of measuring the ink viscosity at 25 ° C., it was 4.0 mPa · s. Experiments were conducted using the same apparatus as in Examples 1 to 5, and the humidity (6 ... 50 RH%, 7 ... 45) shown in Table 1 was changed by changing the amount of liquid to be applied.
RH%) was set and the experiment was performed. Table 1 shows the evaluation results.
Described in.

Comparative Example 1 Using the same ink compositions as in Examples 1 to 5, an experiment was conducted at a humidity of 35 RH% shown in Table 1 without applying a liquid. The evaluated results are shown in Table 1.

[Comparative Example 2] An experiment was conducted using the same commercial cyan ink for inkjet as in Examples 6 and 7 at a humidity of 39 RH% shown in Table 1 without applying a liquid. The evaluated results are shown in Table 1.

[0065]

From the results shown in Table 1, it can be seen that non-ejection nozzles are generated when the humidity of the print head portion is less than 40 RH%, and disappear when the humidity of the print head portion is increased to 40 RH% or more. Further, it is understood that when the humidity of the print head portion is raised to 40 RH% or more, the adhesion of paper dust to the print head portion can be effectively prevented.

[0067]

According to the ink jet recording apparatus of the first aspect, since the liquid applying means for applying the liquid to the recording paper is provided, it is possible to prevent the generation of paper dust, and to generate from the recording paper. No paper powder is deposited in the vicinity of the ink ejection nozzle holes, and there is no reaction with the ink material, aggregation of the colorant, or thickening of the ink. Further, the recording paper coated with the liquid by the liquid coating means is heated and dried, and the humidity near the nozzles of the print head rises due to the influence of the vapor of the liquid applied to the recording paper as a result of the heating and drying. It is possible to prevent non-ejection of ink due to the above, and it is possible to perform printing with excellent ejection reliability, particularly, intermittent ejection performance.

According to the ink jet recording apparatus of the second aspect, since the means for guiding the vapor of the liquid applied to the recording paper resulting from heating and drying the recording paper to the vicinity of the print head is provided, the vicinity of the nozzle of the print head is provided. It is possible to maintain a high humidity state, it is possible to reliably prevent non-ejection of ink due to drying of the nozzle surface, and it is possible to perform printing with excellent ejection reliability and intermittent ejection performance.

According to the ink jet recording apparatus of the third aspect, the recording paper is heated and dried before the liquid is applied, and the recording paper is continuously heated and dried even after the liquid is applied. Therefore, the applied liquid is easily vaporized, and the effect obtained by claim 1 or claim 2 can be maintained even if the relative speed between the recording sheet and the print head is increased.

According to the ink jet recording apparatus of the fourth aspect, when the relative humidity in the vicinity of the print head is set to 40 RH% or more, it is possible to prevent ink non-ejection due to the drying of the nozzle surface from the experimental result, and the paper dust It has been confirmed that adhesion to the nozzle surface can be prevented.

According to the ink jet recording apparatus of the fifth aspect, at least one of water and an organic solvent is contained as a liquid to be applied, and if an organic solvent having a lower boiling point and a lower vapor pressure than water is used, high speed printing is possible. It becomes possible to deal with

According to the ink jet recording apparatus of the sixth aspect, since the heater for controlling the temperature of the liquid to be applied is further provided, the temperature of the liquid to be applied is raised by using the heater to apply the liquid to the applied liquid. Can be easily evaporated, and high speed printing can be supported.

According to the ink jet recording apparatus of the seventh aspect, the structure of the sixth aspect enables high-speed printing, and the relative speed between the print head and the recording paper is 1.
Printing can be performed at a recording speed of 0 inch / second (ips) or more.

According to the ink jet recording apparatus of the eighth aspect, since the line type print head is adopted, high speed printing becomes possible.

Since the ink jet recording apparatus according to the ninth aspect has the configuration according to the seventh or eighth aspect, it is possible to perform high-speed, large-volume printing by using continuous paper.

According to the ink jet recording apparatus of the tenth aspect, it is possible to perform double-sided printing at the same time by arranging the configuration described in the first aspect on both sides of the recording sheet. Since both sides are symmetrically processed with the same configuration, curling of the recording paper during transportation can be prevented and the recording paper can be stably transported.

[Brief description of drawings]

FIG. 1 is a schematic diagram of an inkjet recording apparatus according to a first embodiment of the present invention.

FIG. 2 is a partially enlarged view showing an internal configuration of a container of an inkjet recording apparatus according to a second embodiment of the present invention.

FIG. 3 is a partially enlarged view showing an internal configuration of a container of an inkjet recording device according to a third embodiment of the present invention.

FIG. 4 is a partially enlarged view showing an internal configuration of a container of an inkjet recording device according to a fourth embodiment of the present invention.

FIG. 5 is a partially enlarged view showing an internal configuration of a container of an inkjet recording device according to a fifth embodiment of the present invention.

FIG. 6 is a partially enlarged view showing an internal configuration of a container of an inkjet recording device according to a sixth embodiment of the present invention.

[Explanation of symbols]

1 ... Print head 2 ... Recording paper 3 ... Liquid coating section 13 ... Liquid application roller 4 ... Preheat plate 14 ... Heating blower 5 ... Storage 51 ... Humidity control frame 52 ... Opening / closing opening 53 ... slide 6 ... Hygrometer 7 ... Paper supply unit 8: Paper stacker section 9A, 9B, 9C ... Paper transport rollers 10A, 10B ... Guide roller 100 ... Inkjet recording apparatus

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hidetoshi Fujii             Hitachiko, 1060 Takeda, Hitachinaka City, Ibaraki Prefecture             Machine Co., Ltd. (72) Inventor Kunihiro Tamahashi             Hitachiko, 1060 Takeda, Hitachinaka City, Ibaraki Prefecture             Machine Co., Ltd. F-term (reference) 2C056 EA01 EA04 EA14 EA17 EB30                       EB31 EC12 EC13 EC29 EC30                       EC53 FA02 FA10 FA13 HA30                       HA60

Claims (10)

[Claims] 1. A liquid application unit for applying a liquid to a recording sheet, a heating and drying unit for heating and drying the recording sheet, and an ink droplet is ejected onto the recording sheet heat-dried by the heating and drying unit. An ink jet recording apparatus comprising: a print head for forming recording dots; and a sheet conveying means for moving a recording sheet relative to the print head. 2. The ink jet recording apparatus according to claim 1, further comprising means for guiding the vapor of the liquid applied to the recording paper, which is generated as a result of the heating and drying means heating and drying the recording paper, to the vicinity of the print head. Recording device. 3. The liquid applying means applies a liquid to the recording paper heated and dried by the heating and drying means, and the heating and drying means further heats and drys the recording paper to which the liquid has been applied. The inkjet recording device according to claim 1 or 2. 4. The relative humidity in the vicinity of the print head is 4
The ink jet recording apparatus according to any one of claims 1 to 3, wherein the ink content is 0 RH% or more. 5. The ink jet recording apparatus according to claim 1, wherein the applied liquid contains at least one of water and an organic solvent. 6. The ink jet recording apparatus according to claim 1, further comprising a heater for controlling a temperature of a liquid to be applied. 7. The ink jet recording apparatus according to claim 1, wherein printing is performed at a recording speed such that a relative speed between the print head and the recording paper is 10 inches / second (ips) or more. . 8. The ink jet recording apparatus according to claim 7, wherein the print head is a line type in which a plurality of ink nozzles are arranged in parallel so as to cover the entire width direction of the recording paper. 9. The inkjet recording apparatus according to claim 7, wherein the recording paper is continuous paper. 10. The ink jet recording apparatus according to claim 1, wherein double-sided printing is performed at the same time.