JP2012111194A - Inkjet recording device - Google Patents
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Description
本発明はインクジェット記録装置に関し、より詳細には、画像担持体にインク画像を形成した後、画像担持体から記録媒体にインク画像を転写するインクジェット記録装置に関するものである。 The present invention relates to an ink jet recording apparatus, and more particularly to an ink jet recording apparatus that forms an ink image on an image carrier and then transfers the ink image from the image carrier to a recording medium.
インク吐出ヘッドからインク液滴を記録媒体に吐出して画像を形成するインクジェット方式の画像形成装置（インクジェット記録装置）は、電子写真方式に比べて構造が簡単で小型・軽量化しやすく、また電子写真方式のような加熱定着部が不要で消費電力も少ないことから近年広く使用されている（特許文献１など）。 An inkjet image forming apparatus (inkjet recording apparatus) that forms an image by ejecting ink droplets from an ink ejection head onto a recording medium is simpler in structure, smaller in size and lighter in weight than an electrophotographic system, and electrophotographic. In recent years, it has been widely used because it does not require a heating and fixing unit as in the system and consumes less power (Patent Document 1, etc.).
一方、インクジェット記録装置は、水などの分散媒に着色剤としての顔料や染料を分散させたインクを用いるので、インク吸収層のない普通紙に画像を形成した場合にはインクの滲みが生じ解像度が悪くなる。 On the other hand, since an ink jet recording apparatus uses ink in which a pigment or dye as a colorant is dispersed in a dispersion medium such as water, when an image is formed on plain paper without an ink absorbing layer, ink bleeding occurs. Becomes worse.
そこで、インクの滲みを抑えるためこれまでから種々の方法が提案されている。例えば、インク画像を形成する前に記録媒体に凝集剤を吹き付け塗布してインクの滲みを抑制する方法、あるいは高粘度の顔料分散インクを用いる方法、さらには固形インクをヘッド内で加熱して液体とし記録媒体に打滴する方法などが提案され、市販装置に搭載されている方法もある。 Therefore, various methods have been proposed so far to suppress ink bleeding. For example, before forming an ink image, a method of spraying a flocculant onto a recording medium and applying it to suppress ink bleeding, or a method using a high-viscosity pigment-dispersed ink, or heating a solid ink in a head to form a liquid A method for ejecting droplets onto a recording medium has been proposed, and there is a method that is mounted on a commercially available apparatus.
しかしながら、記録媒体に凝集剤を予め塗布する方法では、極めて短時間に凝集剤を乾燥させなければならず電子写真方式と同程度の電力を必要とするおそれがある。また、記録媒体の非画像形成領域にも凝集剤を塗布するため凝集剤の無駄が不可避的に生じる。高粘度の顔料分散インクを用いる方法では、記録媒体の水分吸収は従来に比べて抑えられると考えられるものの、画像形成部分が広い場合には記録媒体に吸収される水分量が多くなるため、記録媒体のコシが低下するおそれがある。固形インクを用いる方法では、ヘッド内でインクが再固化しないように加熱しておく必要があるため電力消費が多くなるおそれがある。 However, in the method in which the flocculant is previously applied to the recording medium, the flocculant must be dried in a very short time, and there is a possibility that the same level of power as in the electrophotographic method may be required. Further, since the flocculant is applied to the non-image forming area of the recording medium, the waste of the flocculant is unavoidable. In the method using a high-viscosity pigment-dispersed ink, the water absorption of the recording medium is considered to be suppressed as compared with the conventional method. However, when the image forming part is wide, the amount of water absorbed by the recording medium increases. The stiffness of the medium may be reduced. In the method using solid ink, it is necessary to heat the head so that the ink does not re-solidify in the head, which may increase power consumption.
また、中間転写体上に液状インクで画像を形成し、形成したインク画像から溶媒を吸収除去した後、中間転写体から記録媒体に画像を転写する記録装置も提案されている（例えば特許文献２を参照）。かかる記録装置では、中間転写体にローラを圧接し、中間転写体とローラとのニップ部に記録媒体を搬送して中間転写体から記録媒体に画像を転写している。この際、ニップ部における中間転写体とローラとの速度は等速と考えられる。ところが、本発明者等の実験によれば、ニップ部における中間転写体とローラとを等速度とした場合、中間転写体から記録媒体への画像の転写率は著しく低い。 There has also been proposed a recording apparatus that forms an image with liquid ink on an intermediate transfer member, absorbs and removes the solvent from the formed ink image, and then transfers the image from the intermediate transfer member to a recording medium (for example, Patent Document 2). See). In such a recording apparatus, a roller is pressed against the intermediate transfer member, and a recording medium is conveyed to a nip portion between the intermediate transfer member and the roller to transfer an image from the intermediate transfer member to the recording medium. At this time, the speed of the intermediate transfer member and the roller at the nip is considered to be constant. However, according to the experiments by the present inventors, when the intermediate transfer member and the roller in the nip part are set at the same speed, the transfer rate of the image from the intermediate transfer member to the recording medium is extremely low.
本発明は、前記のような従来の問題に鑑みてなされたものであり、その目的は、消費電力を増加させることなく、記録媒体におけるインクの滲みを抑制するとともに、画像担持体から記録媒体への画像の転写率を高めたインクジェット記録装置を提供することにある。 The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to suppress ink bleeding on a recording medium without increasing power consumption, and from an image carrier to a recording medium. Another object of the present invention is to provide an ink jet recording apparatus having an improved image transfer rate.
本発明によれば、親水性と疎水性とが温度によって可逆変化する感温性高分子層を表面に有する回転自在の画像担持体と、前記画像担持体にインクを吐出して画像を形成するインク吐出手段と、前記画像担持体に形成された画像を記録媒体に転写する転写手段と、記録媒体に画像が転写された後の前記感温性高分子層を加熱する加熱手段と、前記加熱手段よりも前記画像担持体の回転方向下流側に設けられた、前記画像担持体の表面の水分を除去する水分除去手段とを備え、前記インク吐出手段によって画像を形成する時は、前記感温性高分子層を親水性としてインク中の水分を前記感温性高分子層に吸収させ、画像が記録媒体に転写された後は、前記感温性高分子層を前記加熱手段で加熱して前記感温性高分子層を疎水性に変化させ、前記感温性高分子層から滲み出した水分を前記水分除去手段で除去するインクジェット記録装置であって、前記転写手段が、前記画像担持体に圧接する回転自在の転写ローラを備え、前記画像担持体と前記転写ローラとのニップ部に記録媒体を搬送するとともに、前記ニップ部における前記画像担持体の周速を記録媒体の搬送速度よりも速くして、前記画像担持体に形成された画像を記録媒体に転写することを特徴とするインクジェット記録装置が提供される。 According to the present invention, a rotatable image carrier having a temperature-sensitive polymer layer whose hydrophilicity and hydrophobicity reversibly change with temperature, and an image is formed by ejecting ink onto the image carrier. Ink ejection means, transfer means for transferring an image formed on the image carrier to a recording medium, heating means for heating the thermosensitive polymer layer after the image is transferred to the recording medium, and the heating A water removal means for removing water on the surface of the image carrier, which is provided on the downstream side of the image carrier in the rotational direction of the image carrier. After the hydrophilic layer is made hydrophilic and the moisture in the ink is absorbed by the thermosensitive polymer layer and the image is transferred to the recording medium, the thermosensitive polymer layer is heated by the heating means. Changing the thermosensitive polymer layer to be hydrophobic, An ink jet recording apparatus that removes moisture exuded from a thermal polymer layer by the moisture removing means, wherein the transfer means includes a rotatable transfer roller that is pressed against the image carrier, and the image carrier and The recording medium is conveyed to the nip portion with the transfer roller, and the peripheral speed of the image carrier in the nip portion is made faster than the conveyance speed of the recording medium, and the image formed on the image carrier is recorded on the recording medium. An ink jet recording apparatus is provided.
また、本発明によれば、親水性と疎水性とが温度によって可逆変化する感温性高分子層を表面に有する回転自在の画像担持体と、前記画像担持体にインクを吐出して画像を形成するインク吐出手段と、前記画像担持体に形成された画像を記録媒体に転写する転写手段と、記録媒体に画像が転写された後の前記感温性高分子層を加熱するとともに、前記画像担持体の表面の水分を除去する第２加熱手段とを備え、前記インク吐出手段によって画像を形成する時は、前記感温性高分子層を親水性としてインク中の水分を前記感温性高分子層に吸収させ、画像が記録媒体に転写された後は、第２加熱手段によって前記感温性高分子層を加熱して前記感温性高分子層を疎水性に変化させるとともに、前記感温性高分子層から滲み出した水分を除去するインクジェット記録装置であって、前記転写手段が、前記画像担持体に圧接する回転自在の転写ローラを備え、前記画像担持体と前記転写ローラとのニップ部に記録媒体を搬送するとともに、前記ニップ部における前記画像担持体の周速を記録媒体の搬送速度よりも速くして、前記画像担持体に形成された画像を記録媒体に転写することを特徴とするインクジェット記録装置が提供される。 Further, according to the present invention, a rotatable image carrier having a temperature-sensitive polymer layer whose hydrophilicity and hydrophobicity reversibly change depending on temperature on the surface, and ejecting ink onto the image carrier to form an image. Ink discharging means for forming, transfer means for transferring the image formed on the image carrier to a recording medium, heating the thermosensitive polymer layer after the image is transferred to the recording medium, and the image A second heating means for removing moisture on the surface of the carrier, and when forming an image by the ink ejection means, the temperature-sensitive polymer layer is made hydrophilic so that the moisture in the ink is increased in temperature sensitivity. After the absorption by the molecular layer and the transfer of the image to the recording medium, the temperature-sensitive polymer layer is heated by the second heating means to change the temperature-sensitive polymer layer to hydrophobic, and the sensitivity is increased. Removes water exuding from the thermophilic polymer layer In the ink jet recording apparatus, the transfer unit includes a rotatable transfer roller that is pressed against the image carrier, conveys a recording medium to a nip portion between the image carrier and the transfer roller, and the nip There is provided an ink jet recording apparatus characterized in that an image formed on the image carrier is transferred to a recording medium by making a peripheral speed of the image carrier in the section faster than a conveying speed of the recording medium.
ここで、前記画像担持体から記録媒体への画像の転写率を一層高める観点からは、前記ニップ部における前記画像担持体の周速は、記録媒体の搬送速度の１．２倍以下とするのが好ましい。 Here, from the viewpoint of further increasing the transfer rate of the image from the image carrier to the recording medium, the peripheral speed of the image carrier in the nip portion is 1.2 times or less the conveyance speed of the recording medium. Is preferred.
また、親水性と疎水性とに可逆変化する前記感温性高分子層の相転移温度としては５℃〜４５℃の範囲が好ましい。 The phase transition temperature of the thermosensitive polymer layer that reversibly changes between hydrophilic and hydrophobic is preferably in the range of 5 ° C to 45 ° C.
さらに、前記インクとしては顔料を水に分散したものが好ましい。 Further, the ink is preferably one in which a pigment is dispersed in water.
本発明のインクジェット記録装置によれば、電力消費量を増加させることなく、記録媒体におけるインクの滲みを抑制できるとともに、画像担持体から記録媒体への画像の転写率を高めることができる。 According to the ink jet recording apparatus of the present invention, it is possible to suppress ink bleeding on the recording medium without increasing the power consumption, and to increase the transfer rate of the image from the image carrier to the recording medium.
以下、本発明に係るインクジェット記録装置について図に基づいて以下説明するが、本発明はこれらの実施形態に何ら限定されるものではない。 Hereinafter, the ink jet recording apparatus according to the present invention will be described with reference to the drawings. However, the present invention is not limited to these embodiments.
図１は、本発明に係るインクジェット記録装置の一例を示す概説図である。この図のインクジェット記録装置は、円筒状の基体１１の表面に感温性高分子層１２が形成された画像担持体１と、画像信号に基づいて感温性高分子層１２にインク画像を形成するインク吐出ヘッド２と、画像担持体１に圧接する転写ローラ（転写手段）３と、画像担持体１に圧接し感温性高分子層１２を加熱する、軸方向に細長いハロゲンヒータＨを内蔵した加熱ローラ（加熱手段）４と、感温性高分子層１２表面の水分を吸収除去する水分吸収ローラ（水分除去手段）５とを備える。なお、この図で示したインクジェット記録装置は単色の画像を形成するものであるが、複数のインク吐出ヘッドを設けて複数色のインクを吐出可能としカラーインク画像が形成可能な装置にも本発明はもちろん適用できる。 FIG. 1 is a schematic view showing an example of an ink jet recording apparatus according to the present invention. The ink jet recording apparatus shown in this figure forms an ink image on the temperature-sensitive polymer layer 12 based on an image carrier 1 having a temperature-sensitive polymer layer 12 formed on the surface of a cylindrical substrate 11 and an image signal. Incorporates an ink discharge head 2 that is in contact, a transfer roller (transfer means) 3 that is in pressure contact with the image carrier 1, and a halogen heater H that is elongated in the axial direction and that heats the thermosensitive polymer layer 12 in pressure contact with the image carrier 1 And a moisture absorbing roller (moisture removing means) 5 that absorbs and removes moisture from the surface of the thermosensitive polymer layer 12. The ink jet recording apparatus shown in this figure forms a single color image. However, the present invention is also applicable to an apparatus capable of forming a color ink image by providing a plurality of ink discharge heads and discharging a plurality of color inks. Is of course applicable.
本発明で使用する感温性高分子は、相転移温度以下では親水性を示し、相転移温度以上では疎水性を示す高分子である。例えば、Ｎ−イソプロピルアクリルアミドやＮ−メチルアクリルアミド，Ｎ−アクリロイルピロリジン，Ｎ−ビニルイソブチルアミド、ビニルエーテルなどを構成単位として含む単独重合体又は共重合体を挙げることができる。感温性高分子の相転移温度は装置内温度よりも高いことが好ましく、通常、５℃〜４５℃の範囲が好ましい。 The temperature-sensitive polymer used in the present invention is a polymer that exhibits hydrophilicity below the phase transition temperature and exhibits hydrophobicity above the phase transition temperature. For example, a homopolymer or a copolymer containing N-isopropylacrylamide, N-methylacrylamide, N-acryloylpyrrolidine, N-vinylisobutyramide, vinyl ether or the like as a structural unit can be given. The phase transition temperature of the thermosensitive polymer is preferably higher than the temperature in the apparatus, and is usually preferably in the range of 5 ° C to 45 ° C.
本発明で使用する画像担持体１は、このような感温性高分子からなる層を円筒状の基体１１の表面に形成してなる。感温性高分子層１２の基体１１への形成は、例えば、感温性高分子をシート状に成形した後、シランカップリング剤などの接着剤で基体１１に貼着する方法等が挙げられる。基体１１の材料としては、例えば、アルミニウムやステンレス鋼などの金属材料やポリオレフィンやポリ塩化ビニル、ポリエチレンテレフタレートなどのプラスチック材料が挙げられる。また、基体１１は、円筒状に限定されるものではなく、例えば無端状ベルトであっても構わない。 The image carrier 1 used in the present invention is formed by forming a layer made of such a temperature-sensitive polymer on the surface of a cylindrical substrate 11. Examples of the formation of the temperature-sensitive polymer layer 12 on the substrate 11 include a method in which the temperature-sensitive polymer is formed into a sheet and then adhered to the substrate 11 with an adhesive such as a silane coupling agent. . Examples of the material of the substrate 11 include metal materials such as aluminum and stainless steel, and plastic materials such as polyolefin, polyvinyl chloride, and polyethylene terephthalate. Further, the base 11 is not limited to a cylindrical shape, and may be an endless belt, for example.
このような構成のインクジェット記録装置において画像形成は次のようにして行われる。まず、画像信号に基づいてインク吐出ヘッド２からインク７が吐出され、感温性高分子層１２にインク画像が形成される。本発明で使用するインク吐出ヘッド２は、オンデマンド方式やコンティニュアス方式など従来公知の方式を用いることができる。また吐出方式としては、例えば、シングルキャビティー型、ダブルキャビティー型、ベンダー型、ピストン型、シェアーモード型、シェアードウォール型等の電気−機械変換方式；サーマルインクジェット型、バブルジェット（登録商標）型の等の電気−熱変換方式；スパークジェット型等の静電吸引方式などが挙げられる。さらに、印字方式としては、シリアルヘッド方式、ラインヘッド方式等のいずれの方式も用いることができる。 In the ink jet recording apparatus having such a configuration, image formation is performed as follows. First, ink 7 is ejected from the ink ejection head 2 based on the image signal, and an ink image is formed on the temperature-sensitive polymer layer 12. For the ink discharge head 2 used in the present invention, a conventionally known method such as an on-demand method or a continuous method can be used. As the discharge method, for example, electro-mechanical conversion methods such as single cavity type, double cavity type, bender type, piston type, shear mode type, shared wall type, etc .; thermal ink jet type, bubble jet (registered trademark) type An electric-thermal conversion system such as No .; and an electrostatic suction system such as a spark jet type. Further, as a printing method, any method such as a serial head method or a line head method can be used.
そして、不図示の駆動源によって画像担持体１は図の右回りに回転し、インク画像は画像担持体１と転写ローラ３とのニップ部に搬送される。 Then, the image carrier 1 is rotated clockwise in the figure by a drive source (not shown), and the ink image is conveyed to the nip portion between the image carrier 1 and the transfer roller 3.
ここで、感温性高分子層１２の、少なくともインク吐出ヘッド２によるインク画像形成領域から転写ローラ３によるインク画像の転写領域までの間は、相転移温度未満の温度に調整されている必要がある。すなわち、この領域では感温性高分子層１２を親水性とし、前記ニップ部にインク画像が回転搬送されるまでに、インク中の水分７１を感温性高分子層１２に吸収させ、感温性高分子層１２の表面には主に顔料７２が残存するようにする。そして、ニップ部において、大部分の水分７１が取り除かれたインク画像（主に顔料７２）を、不図示の搬送手段によってニップ部に搬送されてきた記録部材６に転写させる。これにより、従来問題となっていた記録媒体６におけるインク画像の滲みが確実に抑えられるようになる。 Here, it is necessary that the temperature-sensitive polymer layer 12 is adjusted to a temperature lower than the phase transition temperature at least from the ink image formation region by the ink ejection head 2 to the ink image transfer region by the transfer roller 3. is there. That is, in this region, the temperature-sensitive polymer layer 12 is made hydrophilic, and moisture 71 in the ink is absorbed by the temperature-sensitive polymer layer 12 until the ink image is rotated and conveyed to the nip portion. The pigment 72 is mainly left on the surface of the conductive polymer layer 12. Then, the ink image (mainly pigment 72) from which most of the moisture 71 has been removed in the nip portion is transferred to the recording member 6 that has been conveyed to the nip portion by a conveying means (not shown). As a result, the bleeding of the ink image on the recording medium 6, which has been a problem in the past, can be reliably suppressed.
また、画像担持体１から記録媒体６へのインク画像の転写は、ニップ部において画像担持体１の周速度を記録媒体６の搬送速度よりも速くし、発生するずり応力を利用してインク画像を記録媒体６に転写させる。これにより、画像担持体１から記録媒体６へのインク画像の転写率が格段に向上する。ニップ部における画像担持体１と記録媒体６との速度差は、好ましくは前記画像担持体の周速が記録媒体の搬送速度の１．２倍以下である。 In addition, the transfer of the ink image from the image carrier 1 to the recording medium 6 is performed by making the peripheral speed of the image carrier 1 faster than the conveying speed of the recording medium 6 in the nip portion, and using the generated shear stress. Is transferred to the recording medium 6. Thereby, the transfer rate of the ink image from the image carrier 1 to the recording medium 6 is remarkably improved. The difference in speed between the image carrier 1 and the recording medium 6 at the nip portion is preferably such that the peripheral speed of the image carrier is 1.2 times or less the conveyance speed of the recording medium.
インク画像が記録媒体６に転写した後、画像担持体１がさらに回転すると、加熱ローラ４によって感温性高分子層１２が加熱される。感温性高分子層１２が相転移温度以上に加熱されると、感温性高分子層１２は親水性から疎水性に変化し、感温性高分子層１２に吸収されていた水分７１が表面に滲み出してくる。なお、加熱温度は、感温性高分子層１２の相転移温度以上であればよく、この相転移温度を常温に近い温度に設定することにより、消費電力を従来の装置に比べて低くすることができる。感温性高分子層１２を加熱する手段としては、加熱ローラ４の他、接触方式あるいは非接触方式の従来公知の加熱手段を用いることができる。また、加熱手段の設置位置としては、画像担持体１の外周部であってもよいし内周部であってもよい。 When the image carrier 1 is further rotated after the ink image is transferred to the recording medium 6, the temperature-sensitive polymer layer 12 is heated by the heating roller 4. When the temperature-sensitive polymer layer 12 is heated to a temperature higher than the phase transition temperature, the temperature-sensitive polymer layer 12 changes from hydrophilic to hydrophobic, and the moisture 71 absorbed in the temperature-sensitive polymer layer 12 is absorbed. It oozes on the surface. The heating temperature only needs to be equal to or higher than the phase transition temperature of the temperature-sensitive polymer layer 12. By setting the phase transition temperature to a temperature close to room temperature, the power consumption can be reduced as compared with the conventional apparatus. Can do. As a means for heating the temperature-sensitive polymer layer 12, in addition to the heating roller 4, a contact type or non-contact type conventionally known heating means can be used. Further, the installation position of the heating means may be the outer peripheral portion of the image carrier 1 or the inner peripheral portion.
次いで、感温性高分子層１２から滲み出た水分７１は、画像担持体１に圧接しながら回転する、多孔質体から構成される水分吸収ローラ５と画像担持体１とのニップ部において、水分吸収ローラ５に吸収され画像担持体１表面から除去される。水分吸収ローラ５によって吸収された水分７１は水分吸収ローラ５の軸中心又は外周側からポンプ等で吸引して回収するようにしてもよい。なお、感温性高分子層１２表面から水分７１を除去する手段としては、水分吸収ローラ５の他、ブレード圧接や加熱乾燥、エアナイフ等の従来公知の除去手段を用いることができる。 Next, the moisture 71 that has oozed out of the temperature-sensitive polymer layer 12 rotates while being pressed against the image carrier 1, and is rotated at the nip portion between the moisture absorbing roller 5 made of a porous material and the image carrier 1. It is absorbed by the moisture absorbing roller 5 and removed from the surface of the image carrier 1. The moisture 71 absorbed by the moisture absorbing roller 5 may be collected by being sucked by a pump or the like from the axial center or the outer peripheral side of the moisture absorbing roller 5. As means for removing the moisture 71 from the surface of the thermosensitive polymer layer 12, conventionally known removal means such as blade pressure welding, heat drying, and air knife can be used in addition to the moisture absorbing roller 5.
そして、水分吸収ローラ５によって表面の水分７１が除去された画像担持体１は、インク突出ヘッド２によって画像形成がなされる位置に回転移動する間に空冷され、相転移温度以下まで冷却される。これによって感温性高分子層１２は疎水性から親水性に変化し、インク突出ヘッド２から感温性高分子層１２に吐出され形成されたインク画像の水分７１が、前述のように、感温性高分子層１２に吸収される。なお、水分吸収ローラ５からインク吐出ヘッド２まで画像担持体１が回転する間に、画像担持体１を相転移温度以下まで確実に冷却する観点から、水分吸収ローラ５とインク吐出ヘッド２との間に冷却手段をさらに設けても構わない。冷却手段としては、ファンなどを用いた風冷やヒートポンプ、ペルチェ素子などが挙げられる。 Then, the image carrier 1 from which the moisture 71 on the surface has been removed by the moisture absorbing roller 5 is cooled by air while rotating to a position where image formation is performed by the ink protruding head 2, and is cooled to a phase transition temperature or lower. As a result, the temperature-sensitive polymer layer 12 changes from hydrophobic to hydrophilic, and the moisture 71 of the ink image formed by ejection from the ink protruding head 2 to the temperature-sensitive polymer layer 12 is, as described above, sensitive. Absorbed by the warm polymer layer 12. From the viewpoint of surely cooling the image carrier 1 to the phase transition temperature or lower while the image carrier 1 rotates from the water absorption roller 5 to the ink ejection head 2, the water absorption roller 5 and the ink ejection head 2 are connected. A cooling means may be further provided between them. Examples of the cooling means include air cooling using a fan, a heat pump, a Peltier element, and the like.
本発明で使用するインク７としては、顔料インク及び染料インクのいずれも使用することができるが、記録媒体６への転写性等を考慮すれば顔料インクが好ましい。顔料インクは媒体としての水７１に顔料７２を分散したものであり、必要によりラテックスやポリマーが混合されていてもよい。 As the ink 7 used in the present invention, either a pigment ink or a dye ink can be used, but a pigment ink is preferable in consideration of transferability to the recording medium 6 and the like. The pigment ink is obtained by dispersing pigment 72 in water 71 as a medium, and latex or polymer may be mixed as necessary.
以上説明したインクジェット記録装置によれば、インクジェット専用紙のみならず、普通紙、アート紙など従来はインクが滲みやすかった記録媒体６に対しても高解像度のインク画像が形成できる。 According to the ink jet recording apparatus described above, a high-resolution ink image can be formed not only on the ink jet dedicated paper but also on the recording medium 6 that has conventionally been liable to bleed, such as plain paper or art paper.
図２に、第２の発明に係るインクジェット記録装置の一実施形態を示す概説図を示す。この図に示すインクジェット記録装置が、図１のインクジェット記録装置と異なる点は、加熱手段と水分除去手段とを１つの手段で行う点にある。なお、その他の構成は前記のインクジェット記録装置と同じであるのでここではそれらの説明は省略する。 FIG. 2 is a schematic diagram showing one embodiment of the ink jet recording apparatus according to the second invention. The ink jet recording apparatus shown in this figure is different from the ink jet recording apparatus of FIG. 1 in that the heating means and the water removing means are performed by one means. Since other configurations are the same as those of the ink jet recording apparatus, description thereof is omitted here.
図２のインクジェット記録装置では、転写ローラ３よりも画像担持体１の回転方向下流側に加熱装置（第２加熱手段）８を設けている。この加熱装置８は、画像担持体１の表面に対して離隔対向し、且つ周方向に所定間隔で軸方向に細長い３本のハロゲンヒータＨが設置されている。そして、これら３本のハロゲンヒータＨは、画像担持体１側が開口とされたハウジング８１内に収納されている。ハウジング８１の内周面は光反射性を有し、ハロゲンヒータＨから放射された熱線は直接又はハウジング８１の内周面で反射して画像担持体１に照射し、画像担持体１を加熱する。なお、ハロゲンヒータＨの設置本数に限定はなく、感温性高分子層１２を相転移温度以上に加熱でき且つ表面に滲出してきた水分７１を蒸発させることができる熱量を付与できる限り、１本又は２本であってもよいし、４本以上であってもよい。 In the ink jet recording apparatus of FIG. 2, a heating device (second heating means) 8 is provided downstream of the transfer roller 3 in the rotation direction of the image carrier 1. The heating device 8 is provided with three halogen heaters H that are spaced apart from the surface of the image carrier 1 and elongated in the axial direction at predetermined intervals in the circumferential direction. These three halogen heaters H are accommodated in a housing 81 having an opening on the image carrier 1 side. The inner peripheral surface of the housing 81 has light reflectivity, and the heat rays emitted from the halogen heater H are directly or reflected by the inner peripheral surface of the housing 81 to irradiate the image carrier 1 to heat the image carrier 1. . The number of halogen heaters H is not limited, and one halogen heater H can be provided as long as the heat-sensitive polymer layer 12 can be heated to a temperature higher than the phase transition temperature and heat can be evaporated to evaporate the moisture 71 that has exuded on the surface. Or two may be sufficient and four or more may be sufficient.
前記実施形態と同様に、インク吐出ヘッド２からインク７が吐出されて感温性高分子層１２にインク画像が形成される。感温性高分子層１２は相転移温度未満に調整されており親水性を示し、インク画像中の水分７１は感温性高分子層１２に吸収される。そして、転写ローラ３によって記録媒体６にインク画像（主に顔料７２）が転写される。その後、加熱装置８によって画像担持体１表面の感温性高分子層１２は相転移温度以上に加熱される。これにより、感温性高分子層１２が親水性から疎水性に変化し、感温性高分子層１２に吸収されていた水分７１が表面に滲み出してくる。本発明のインクジェット記録装置では、加熱装置８で画像担持体１をさらに加熱して表面に滲み出してきた水分７１を蒸発除去する。これにより、図１のインクジェット記録装置では必要であった水分除去手段が不要となる。 As in the above embodiment, ink 7 is ejected from the ink ejection head 2, and an ink image is formed on the temperature-sensitive polymer layer 12. The temperature-sensitive polymer layer 12 is adjusted to be lower than the phase transition temperature and exhibits hydrophilicity, and moisture 71 in the ink image is absorbed by the temperature-sensitive polymer layer 12. Then, an ink image (mainly pigment 72) is transferred to the recording medium 6 by the transfer roller 3. Thereafter, the temperature-sensitive polymer layer 12 on the surface of the image carrier 1 is heated to a temperature higher than the phase transition temperature by the heating device 8. Thereby, the temperature-sensitive polymer layer 12 changes from hydrophilic to hydrophobic, and the moisture 71 absorbed in the temperature-sensitive polymer layer 12 oozes out to the surface. In the ink jet recording apparatus of the present invention, the heating device 8 further heats the image carrier 1 to evaporate and remove the moisture 71 that has oozed out on the surface. This eliminates the need for water removal means that was necessary in the ink jet recording apparatus of FIG.
本発明で使用する第２加熱手段は複数本のハロゲンヒータＨに限定されるものではなく、感温性高分子層１２を相転移温度以上に加熱でき且つ表面に滲出してきた水分を除去できるものであればよく、例えば表面に多孔質層が形成された接触式の加熱ローラなども好適に使用できる。 The second heating means used in the present invention is not limited to a plurality of halogen heaters H, but can heat the temperature-sensitive polymer layer 12 to a temperature higher than the phase transition temperature and can remove moisture exuded on the surface. For example, a contact-type heating roller having a porous layer formed on the surface can be suitably used.
（感温性高分子の作製）
イオン交換水を容器に入れた後、窒素置換して脱酸素を行った。このイオン交換水に対してＮ−イソプロピルアクリルアミドを０．１ｗｔ％加えた後、再度窒素置換を行い撹拌した。そして、Ｎ−イソプロピルアクリルアミド１ｍｍｏｌに対して、架橋剤としてのメチレンビスアクリルアミドを０．００７５ｍｍｏｌ、重合促進剤としてのテトラメチルエチレンジアミンを０．１３ｍｍｏｌ、重合開始剤としてのペルオキソ二硫酸アンモニウムを０．００６５ｍｍｏｌをそれぞれ加え、窒素置換後撹拌し、ゲル化が終了するまで静置し感温性高分子を得た。その後、得られた感温性高分子を純水で洗浄し試料とした。
(Preparation of thermosensitive polymer)
After ion-exchanged water was put in a container, it was deoxygenated by replacing with nitrogen. After adding 0.1 wt% of N-isopropylacrylamide to the ion-exchanged water, nitrogen substitution was performed again and stirring was performed. Then, with respect to 1 mmol of N-isopropylacrylamide, 0.0075 mmol of methylenebisacrylamide as a crosslinking agent, 0.13 mmol of tetramethylethylenediamine as a polymerization accelerator, and 0.0065 mmol of ammonium peroxodisulfate as a polymerization initiator, respectively. In addition, the mixture was stirred after substitution with nitrogen and allowed to stand until gelation was completed to obtain a thermosensitive polymer. Thereafter, the obtained temperature sensitive polymer was washed with pure water to prepare a sample.
実施例１
エプソン社製のインクジェット記録装置「ＰＸ−Ｇ９２０」のインク吐出ヘッドを用いて、前記作製した感温性高分子からなる層に５ポイントの大きさの文字「響」を水性顔料インクで形成した。実施例１における感温性高分子層に形成された文字は、線と線の間がつぶれることなく高解像度であった。
次いで、感温性高分層と転写ローラとを圧接し、感温性高分子層と転写ローラとのニップ部にコニカミノルタ社製の普通紙「Ｊペーパー」を搬送し、感温性高分子層の文字「響」を普通紙に転写した。感温性高分子層の周速は普通紙の搬送速度の１．１倍とした。感温性高分子層から普通紙に転写された文字は、転写率が高く高解像度であった。
Example 1
Using the ink ejection head of an ink jet recording apparatus “PX-G920” manufactured by Epson, the character “Hibi” having a size of 5 points was formed with the aqueous pigment ink on the layer made of the temperature-sensitive polymer. The characters formed on the temperature-sensitive polymer layer in Example 1 had high resolution without crushing between the lines.
Next, the temperature sensitive polymer layer and the transfer roller are pressed against each other, and the ordinary paper “J paper” manufactured by Konica Minolta is conveyed to the nip between the temperature sensitive polymer layer and the transfer roller. The letter “Hibi” on the layer was transferred to plain paper. The peripheral speed of the thermosensitive polymer layer was 1.1 times the conveying speed of plain paper. The characters transferred from the thermosensitive polymer layer to plain paper had a high transfer rate and high resolution.
比較例１
感温性高分子層の周速を普通紙の搬送速度の１倍とした以外は実施例１と同様にして感温性高分子層から普通紙に文字「響」を転写したところ、転写率が極めて低く普通紙上の文字は判読不能であった。
Comparative Example 1
The character “sound” was transferred from the temperature-sensitive polymer layer to plain paper in the same manner as in Example 1 except that the peripheral speed of the temperature-sensitive polymer layer was set to 1 times the conveying speed of plain paper. However, the characters on plain paper were unreadable.
比較例２
実施例１と同じインク吐出ヘッドを用いて、エプソン社製スーパーファイン紙「ＫＡ４１００ＳＦＲ」に実施例１と同じ文字を直接印字した。スーパーファイン紙に印字された文字は滲みによって潰れ解像度の低いものであった。
Comparative Example 2
Using the same ink ejection head as in Example 1, the same characters as in Example 1 were directly printed on super fine paper “KA4100SFR” manufactured by Epson. The characters printed on the super fine paper were crushed due to bleeding and had a low resolution.
比較例３
実施例１と同じインク吐出ヘッドを用いて、コニカミノルタ社製の普通紙「Ｊペーパー」に実施例１と同じ文字を直接印字した。普通紙に印字された文字は滲みによって潰れ解像度の低いものであった。
Comparative Example 3
Using the same ink ejection head as in Example 1, the same characters as in Example 1 were directly printed on plain paper “J paper” manufactured by Konica Minolta. Characters printed on plain paper were crushed due to bleeding and had low resolution.
本発明のインクジェット記録装置によれば、電力消費量を増加させることなく、記録媒体におけるインクの滲みを抑制することができるとともに、画像担持体から記録媒体への画像の転写率を高めることができ有用である。 According to the ink jet recording apparatus of the present invention, it is possible to suppress ink bleeding on the recording medium without increasing power consumption, and to increase the transfer rate of the image from the image carrier to the recording medium. Useful.
１ 画像担持体
２ インク吐出ヘッド（インク吐出手段）
３ 転写ローラ（転写手段）
４ 加熱ローラ（加熱手段）
５ 水分除去ローラ（水分除去手段）
６ 記録媒体
７ インク
８ 加熱装置（第２加熱手段）
１２ 感温性高分子層
７１ 水分
７２ 顔料
DESCRIPTION OF SYMBOLS 1 Image carrier 2 Ink discharge head (ink discharge means)
3 Transfer roller (transfer means)
4 Heating roller (heating means)
5 Moisture removal roller (moisture removal means)
6 Recording medium 7 Ink 8 Heating device (second heating means)
12 Thermosensitive polymer layer 71 Moisture 72 Pigment
Claims (5)
前記インク吐出手段によって画像を形成する時は、前記感温性高分子層を親水性としてインク中の水分を前記感温性高分子層に吸収させ、画像が記録媒体に転写された後は、前記感温性高分子層を前記加熱手段で加熱して前記感温性高分子層を疎水性に変化させ、前記感温性高分子層から滲み出した水分を前記水分除去手段で除去するインクジェット記録装置であって、
前記転写手段が、前記画像担持体に圧接する回転自在の転写ローラを備え、前記画像担持体と前記転写ローラとのニップ部に記録媒体を搬送するとともに、前記ニップ部における前記画像担持体の周速を記録媒体の搬送速度よりも速くして、前記画像担持体に形成された画像を記録媒体に転写することを特徴とするインクジェット記録装置。 A rotatable image bearing member having a temperature-sensitive polymer layer whose hydrophilicity and hydrophobicity change reversibly depending on temperature, an ink ejection unit that ejects ink onto the image bearing member to form an image, and A transfer means for transferring an image formed on the image carrier to a recording medium; a heating means for heating the thermosensitive polymer layer after the image is transferred to the recording medium; and the image carrier than the heating means. A moisture removing means for removing moisture on the surface of the image carrier provided on the downstream side in the rotation direction of the body,
When an image is formed by the ink ejection means, the temperature-sensitive polymer layer is made hydrophilic, moisture in the ink is absorbed by the temperature-sensitive polymer layer, and after the image is transferred to a recording medium, An ink jet that heats the temperature-sensitive polymer layer with the heating means to change the temperature-sensitive polymer layer to be hydrophobic, and removes moisture exuded from the temperature-sensitive polymer layer with the moisture removing means. A recording device,
The transfer means includes a rotatable transfer roller that presses against the image carrier, conveys a recording medium to a nip portion between the image carrier and the transfer roller, and surrounds the image carrier at the nip portion. An ink jet recording apparatus, wherein an image formed on the image carrier is transferred to a recording medium at a speed higher than a conveying speed of the recording medium.
前記インク吐出手段によって画像を形成する時は、前記感温性高分子層を親水性としてインク中の水分を前記感温性高分子層に吸収させ、画像が記録媒体に転写された後は、第２加熱手段によって前記感温性高分子層を加熱して前記感温性高分子層を疎水性に変化させるとともに、前記感温性高分子層から滲み出した水分を除去するインクジェット記録装置であって、
前記転写手段が、前記画像担持体に圧接する回転自在の転写ローラを備え、前記画像担持体と前記転写ローラとのニップ部に記録媒体を搬送するとともに、前記ニップ部における前記画像担持体の周速を記録媒体の搬送速度よりも速くして、前記画像担持体に形成された画像を記録媒体に転写することを特徴とするインクジェット記録装置。 A rotatable image bearing member having a temperature-sensitive polymer layer whose hydrophilicity and hydrophobicity change reversibly depending on temperature, an ink ejection unit that ejects ink onto the image bearing member to form an image, and Transfer means for transferring the image formed on the image carrier to the recording medium, and heating the thermosensitive polymer layer after the image is transferred to the recording medium, and removing moisture on the surface of the image carrier And a second heating means
When an image is formed by the ink ejection means, the temperature-sensitive polymer layer is made hydrophilic, moisture in the ink is absorbed by the temperature-sensitive polymer layer, and after the image is transferred to a recording medium, An ink jet recording apparatus that heats the thermosensitive polymer layer by a second heating means to change the thermosensitive polymer layer to hydrophobic, and removes moisture exuded from the thermosensitive polymer layer. There,
The transfer means includes a rotatable transfer roller that presses against the image carrier, conveys a recording medium to a nip portion between the image carrier and the transfer roller, and surrounds the image carrier at the nip portion. An ink jet recording apparatus, wherein an image formed on the image carrier is transferred to a recording medium at a speed higher than a conveying speed of the recording medium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010264029A JP2012111194A (en) | 2010-11-26 | 2010-11-26 | Inkjet recording device |
Applications Claiming Priority (1)
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