JP5370815B2 - Image forming apparatus - Google Patents

Image forming apparatus Download PDF

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JP5370815B2
JP5370815B2 JP2009018931A JP2009018931A JP5370815B2 JP 5370815 B2 JP5370815 B2 JP 5370815B2 JP 2009018931 A JP2009018931 A JP 2009018931A JP 2009018931 A JP2009018931 A JP 2009018931A JP 5370815 B2 JP5370815 B2 JP 5370815B2
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ink
foam
intermediate transfer
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transfer member
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JP2010173201A (en
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亮太 鈴木
武雄 塚本
祐馬 臼井
愛乃 長谷川
学 瀬尾
武志 折戸
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Ricoh Co Ltd
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Description

本発明は画像形成装置に関し、詳細にはインクジェット等によって中間転写体に作られた画像の画質及び転写性を改善する技術に関する。   The present invention relates to an image forming apparatus, and more particularly to a technique for improving the image quality and transferability of an image formed on an intermediate transfer member by inkjet or the like.

インクジェット記録ヘッドからインク滴を吐出させる技術は、プリンタ、カラーフィルタ製造装置、回路基板パターンの作成装置等様々な分野で利用されている。このようなインクジェット記録ヘッドを用いたインクジェット記録装置では記録動作を行うために記録媒体に対してインクジェット記録ヘッドをキャリッジに搭載して主走査方向にインクジェット記録ヘッドを移動させ主走査方向に直交する副走査方向に記録媒体を搬送する手段を備えて記録動作を可能にするシリアルタイプのもの、記録媒体の幅と等しい幅でインクジェット記録ヘッドを配置し記録媒体の搬送移動のみで記録動作を行うラインタイプのものがある。いずれのタイプもノズルからインク滴を吐出させることにより記録動作が実施される。   A technique for ejecting ink droplets from an ink jet recording head is used in various fields such as a printer, a color filter manufacturing apparatus, and a circuit board pattern creating apparatus. In an ink jet recording apparatus using such an ink jet recording head, an ink jet recording head is mounted on a carriage with respect to a recording medium in order to perform a recording operation, and the ink jet recording head is moved in the main scanning direction so as to be orthogonal to the main scanning direction. A serial type that includes a means for transporting a recording medium in the scanning direction and enables a recording operation, and a line type in which an ink jet recording head is arranged with a width equal to the width of the recording medium and the recording operation is performed only by transporting the recording medium There are things. In both types, the recording operation is performed by ejecting ink droplets from the nozzles.

このようなインクジェット記録装置の欠点は、多様な記録媒体への対応が難しいという点と、インクジェット記録ヘッドの詰まりによる耐久性・信頼性の低さにある。その欠点を克服するものとして、中間転写体上にインク画像を形成し、その転写体上に形成されたインク画像を所望の記録媒体に転写し、所望の記録媒体にインク画像を形成する方式(中間転写体を用いた画像形成方式)がある。この方式では記録媒体によらない高画質な画像が得られ、またインクジェット記録ヘッドが記録媒体と近接しないことから、記録媒体の埃等によるヘッドの汚染がなくなると期待される。   The disadvantages of such an ink jet recording apparatus are that it is difficult to deal with various recording media and that the durability and reliability are low due to clogging of the ink jet recording head. As a method for overcoming this drawback, a method of forming an ink image on an intermediate transfer member, transferring the ink image formed on the transfer member to a desired recording medium, and forming an ink image on the desired recording medium ( Image forming system using an intermediate transfer member). With this method, high-quality images that do not depend on the recording medium can be obtained, and since the ink jet recording head is not close to the recording medium, it is expected that the head is not contaminated by dust or the like on the recording medium.

しかし、中間転写体は一般的に紙などの記録媒体とは違いインクなどの液体が内部に浸透しないような材質が用いられ、また転写性を良くするために表面が撥水処理されていることが多く、それによって隣接して着弾したインク滴同士が混和しまうブリーディングと呼ばれる現象や、先行して着弾したインクに後続して着弾するインクが引き寄せられてインク滴が集合してしまうビーディングと呼ばれる現象が発生し、画像品位を低下させてしまう場合が多い。   However, unlike a recording medium such as paper, the intermediate transfer member is generally made of a material that does not allow ink or other liquid to penetrate inside, and the surface is water-repellent to improve transferability. This phenomenon is called bleeding where ink droplets landed adjacent to each other are mixed together, and beading where ink droplets gather after the ink that landed after the previously landed ink is attracted. In many cases, a phenomenon occurs and the image quality is deteriorated.

このような課題に対して特許文献1では、中間転写体にインク液滴とともにインクを定着させる機能を有するインク処理液を付与し、ブリーディングやビーディングを防止する技術が提案されている。しかし、これだけでは高画質と高転写率の両立が不十分であったため、更なる工夫が加わった提案がなされてきた。その提案の一つとして、特許文献2にはインクの量に対して処理液の量を少なく供給することによって、中間転写体上でブリーディングやフェザリングのない画像形成方法が提案している。しかし、特許文献2の方法では中間転写体上でインクと処理液が混合されてから転写を行うまでの時間が短いため、高速なシステムに用いると十分な反応が行われず、転写時にドット割れが発生し、転写後の中間転写体上に残存物が残ってしまう。   In order to solve such a problem, Patent Document 1 proposes a technique for preventing bleeding and beading by applying an ink processing liquid having a function of fixing ink together with ink droplets to an intermediate transfer member. However, this alone is insufficient to achieve both high image quality and a high transfer rate, and thus proposals with further improvements have been made. As one of the proposals, Patent Document 2 proposes an image forming method without bleeding or feathering on an intermediate transfer member by supplying a small amount of processing liquid relative to the amount of ink. However, in the method of Patent Document 2, since the time from the mixing of the ink and the treatment liquid on the intermediate transfer member to the transfer is short, sufficient reaction is not performed when used in a high-speed system, and dot cracking occurs during transfer. And the residue remains on the intermediate transfer member after transfer.

そこで、特許文献3では、処理液の最小厚みが1μm以上でかつ単位面積当たりの処理液の量がインクの量以上になるように制御することによって、インクが処理液で覆われ反応が速まることで、高速システムにおける画質と転写性の良さの両立を図っている。   Therefore, in Patent Document 3, by controlling the minimum thickness of the processing liquid to be 1 μm or more and the amount of the processing liquid per unit area to be equal to or more than the amount of ink, the ink is covered with the processing liquid and the reaction is accelerated. Therefore, both high image quality and transferability are achieved in a high-speed system.

しかしながら、特許文献3の方法では、処理液を液滴下する専用のインクジェットヘッドを用いる必要があるため、処理液が低粘性でなくてはならないなど処理液の自由度が低いことに加えて、インク処理液中の成分などによりインクジェットヘッドのノズル孔が詰まる恐れがあり、信頼性に欠けると言える。更に、この方法では画像領域から外側四方にそれぞれ少なくとも1ドットずつ広げた領域に対して処理液を付与するとしているため、インクの領域が広い画像の場合には場所によって処理液の分布にばらつきがあり、逆にインク液滴が孤立している場合には必要な処理液の量が多く(100mg以上)なってしまう。   However, in the method of Patent Document 3, since it is necessary to use a dedicated ink jet head for dropping the processing liquid, the processing liquid must have low viscosity. It can be said that the nozzle holes of the ink jet head may be clogged with components in the processing liquid, and the reliability is lacking. Furthermore, in this method, since the processing liquid is applied to an area that is expanded at least one dot from the image area to the outer four sides, in the case of an image having a wide ink area, the distribution of the processing liquid varies depending on the location. On the other hand, when the ink droplets are isolated, the amount of processing liquid required is large (100 mg or more).

本発明はこのような問題点を解決するためのものであり、インクを凝集させるための処理液を中間転写体に極微量付与し、中間転写体上における画質・信頼性が良く、記録媒体への転写性にも優れた、安価な画像形成装置を提供することを目的とする。   The present invention is for solving such problems. A very small amount of a treatment liquid for aggregating ink is applied to the intermediate transfer member, and the image quality and reliability on the intermediate transfer member is good, and the recording medium is provided. An object of the present invention is to provide an inexpensive image forming apparatus having excellent transferability.

前記問題点を解決するために、本発明の画像形成装置は、インク中の色材と反応する反応剤を含む処理液を泡状にする処理液泡状化手段と、予め中間転写体上に泡状処理剤を付与する泡状処理剤付与手段と、泡状処理剤が付与された中間転写体上に、画像情報に応じて液滴化したインクを付着させ、付着したインクを記録媒体に転写して記録媒体に画像を記録する記録手段とを有することに特徴がある。よって、少ない処理液量でインク液滴との接触面積を大きくすることができ、中間転写体上における画像形成においてブリーディングやビーディング等の画質低下を防止するとともに、記録媒体への優れた転写性を実現できる。また、従来に比べ大幅に処理液の消費を抑えられるため低ランニングコストで高画質な画像の提供が可能となる。 In order to solve the above-described problems, an image forming apparatus according to the present invention includes a processing liquid foaming unit configured to foam a processing liquid containing a reactive agent that reacts with a coloring material in ink, and a bubble previously formed on an intermediate transfer member. a foam treatment agent deposition device which deposits the Jo treatment agent, the foam treatment agent on the intermediate transfer member granted, to adhere the ink liquid droplets in accordance with the images information, deposited ink on the recording medium It is characterized by having a recording means for transferring and recording an image on a recording medium . Therefore, it is possible to increase the contact area with the ink droplets with a small amount of processing liquid, prevent image quality deterioration such as bleeding and beading during image formation on the intermediate transfer member, and excellent transferability to a recording medium. Can be realized. In addition, since the consumption of the processing liquid can be greatly suppressed as compared with the conventional case, it is possible to provide a high-quality image at a low running cost.

また、処理液は、カチオン性部材または水を酸性化する部材と、起泡剤として非イオン性界面活性剤または両性界面活性剤と、水に不溶な水不溶脂肪酸とを含有することが好ましい。このためには、まずインク中の色材が負イオン性もしくは正イオン性に帯電している必要がある。染料は、水中で色材自身が正または負にイオン化する。顔料の場合、自己分散型顔料では、水中で顔料自身が正または負にイオン化することで、また自己分散型でない一般的な顔料においては正または負イオン性を帯びさせることのできる分散剤の吸着により、結果的に顔料自身が正または負にイオン化する。一般にインク中で色材は負イオン性を帯びて分散している。処理液中に水を酸性化する部材またはカチオン部材が含まれていると、プロトンまたはカチオン性部材に色材同士が静電的に結合し、色材を凝集・増粘させることができる。また、起泡剤として非イオン性界面活性剤または両性界面活性剤と、水に不溶な水不溶脂肪酸が含まれることによって、起泡性に優れ、かつ極めて優れた泡沫安定性が得られる。   The treatment liquid preferably contains a cationic member or a member that acidifies water, a nonionic surfactant or an amphoteric surfactant as a foaming agent, and a water-insoluble fatty acid that is insoluble in water. For this purpose, first, the color material in the ink needs to be negatively or positively charged. The dye is ionized positively or negatively in water. In the case of pigments, self-dispersing pigments adsorb dispersants that can be positively or negatively ionized in water, and in general pigments that are not self-dispersing, can be positively or negatively ionic. As a result, the pigment itself ionizes positively or negatively. In general, color materials are dispersed in ink with negative ionic properties. If the treatment liquid contains a member that acidifies water or a cation member, the color materials are electrostatically bonded to the proton or cationic member, and the color material can be aggregated and thickened. Moreover, by including a nonionic surfactant or amphoteric surfactant as a foaming agent and a water-insoluble fatty acid that is insoluble in water, the foam stability is excellent and extremely excellent foam stability is obtained.

本発明によれば、インクと反応する反応剤を含む処理液を泡状に付与することにより、少ない処理液量でも中間転写体上の処理剤の厚みを厚くすることができ、インク液滴を処理剤で完全に包み込むことができ、よってインク中の色材の凝集速度が速まり、転写時のドット割れを防止することができる。   According to the present invention, the treatment liquid containing a reactive agent that reacts with ink is applied in the form of foam, so that the thickness of the treatment agent on the intermediate transfer member can be increased even with a small amount of the treatment liquid. It is possible to completely envelop with the treatment agent, so that the aggregation speed of the coloring material in the ink is increased, and the dot breakage at the time of transfer can be prevented.

本発明の一実施の形態に係る画像形成装置における泡状処理剤付与手段の構成を示す概略図である。It is the schematic which shows the structure of the foam processing agent provision means in the image forming apparatus which concerns on one embodiment of this invention. 本実施の形態の画像形成装置における泡状処理剤生成手段の構成を示す概略図である。It is the schematic which shows the structure of the foam processing agent production | generation means in the image forming apparatus of this Embodiment. 本実施の形態に係る画像形成装置における泡状処理剤付与装置の構成を示す概略図である。It is the schematic which shows the structure of the foam processing agent provision apparatus in the image forming apparatus which concerns on this Embodiment. 液膜厚制御用ブレードを用いた泡状処理剤の塗布ローラ上での膜厚制御の様子を示す概略図である。It is the schematic which shows the mode of the film thickness control on the application | coating roller of the foamy processing agent using the blade for liquid film thickness control. 本実施の形態に係る画像形成装置における泡状処理剤付与装置の別の構成を示す概略図である。It is the schematic which shows another structure of the foam processing agent provision apparatus in the image forming apparatus which concerns on this Embodiment. 本実施の形態に係る画像形成装置における泡状処理剤付与装置の別の構成を示す概略図である。It is the schematic which shows another structure of the foam processing agent provision apparatus in the image forming apparatus which concerns on this Embodiment.

図1は本発明の一実施の形態に係る画像形成装置における泡状処理剤付与手段の構成を示す概略図である。同図に示す本実施の形態の画像形成装置における泡状処理剤付与手段10によれば、処理液を泡状にして、膜厚制御用ブレード12によって塗布ローラ13上に均一膜厚とされた極微量の泡状処理剤11を予め中間転写体14に付与し、その後インクジェットヘッド15から吐出された各色のインク液滴16を画像情報に応じて中間転写体14に付着させる。なお、インク液滴16は、水を主成分として、水中で負または正にイオン性を帯びる色材を含有する。特に、カルボキシル基やスルホン基により負イオン性を帯びる色材が望ましい。また、処理液は、カチオン性部材または水を酸性化する部材と、起泡剤として非イオン性界面活性剤または両性界面活性剤と、水に不溶な水不溶脂肪酸とを含有して泡状化可能であり、かつインク中の色材を凝集化する効果を持つ物質を含むものである。凝集化する物質として、酸性の物質あるいは多価金属イオンを含む塩などが望ましい。このためには、まずインク中の色材が負イオン性もしくは正イオン性に帯電している必要がある。染料は、水中で色材自身が正または負にイオン化する。顔料の場合、自己分散型顔料では、水中で顔料自身が正または負にイオン化することで、また自己分散型でない一般的な顔料においては正または負イオン性を帯びさせることのできる分散剤の吸着により、結果的に顔料自身が正または負にイオン化する。一般にインク中で色材は負イオン性を帯びて分散している。処理液中に水を酸性化する部材またはカチオン部材が含まれていると、プロトンまたはカチオン性部材に色材同士が静電的に結合し、色材を凝集・増粘させることができる。また、起泡剤として非イオン性界面活性剤または両性界面活性剤と、水に不溶な水不溶脂肪酸が含まれることによって、起泡性に優れ、かつ極めて優れた泡沫安定性が得られる。更に、インクジェットヘッド15は、圧電部材や膜沸騰を圧力発生源とした加圧オンデマンド型インクジェットヘッドである。その他に、荷電制御型インクジェットヘッドであってもかまわない。   FIG. 1 is a schematic diagram showing a configuration of a foam processing agent application unit in an image forming apparatus according to an embodiment of the present invention. According to the foam-like processing agent application unit 10 in the image forming apparatus of the present embodiment shown in the figure, the processing liquid is made into a foam and the film thickness is adjusted to a uniform thickness on the coating roller 13 by the blade 12 for film thickness control. A very small amount of foam processing agent 11 is applied to the intermediate transfer member 14 in advance, and then ink droplets 16 of each color ejected from the inkjet head 15 are attached to the intermediate transfer member 14 according to image information. The ink droplet 16 contains water as a main component and a coloring material that is negatively or positively ionic in water. In particular, a color material that is negatively ionic due to a carboxyl group or a sulfone group is desirable. In addition, the treatment liquid is foamed by containing a cationic member or a member that acidifies water, a nonionic surfactant or an amphoteric surfactant as a foaming agent, and a water-insoluble fatty acid that is insoluble in water. It is possible and contains a substance having an effect of aggregating the color material in the ink. As the substance to be aggregated, an acidic substance or a salt containing a polyvalent metal ion is desirable. For this purpose, first, the color material in the ink needs to be negatively or positively charged. The dye is ionized positively or negatively in water. In the case of pigments, self-dispersing pigments adsorb dispersants that can be positively or negatively ionized in water, and in general pigments that are not self-dispersing, can be positive or negatively ionic As a result, the pigment itself ionizes positively or negatively. In general, color materials are dispersed in ink with negative ionic properties. If the treatment liquid contains a member that acidifies water or a cation member, the color materials are electrostatically bonded to the proton or cationic member, and the color material can be aggregated and thickened. Moreover, by including a nonionic surfactant or amphoteric surfactant as a foaming agent and a water-insoluble fatty acid that is insoluble in water, the foam stability is excellent and extremely excellent foam stability is obtained. Furthermore, the inkjet head 15 is a pressure on-demand inkjet head using a piezoelectric member or film boiling as a pressure generation source. In addition, a charge control type inkjet head may be used.

図2は本実施の形態の画像形成装置における泡状処理剤生成手段の構成を示す概略図である。同図に示す泡状処理剤生成手段20によれば、処理液容器21内の処理液22を搬送ポンプ23や搬送チューブ24等の液輸送手段を用いて気体・液体混合部25へ供給する。気体・液体混合部25には、空気口26が設けられ、液の流れとともに、空気口26に負圧が発生し、空気口26から気体が気体・液体混合部25に導入され、処理液22と気体が混合し、更に微細孔シート27を通過することで、泡径のそろった大きな泡の泡状処理剤を生成させることができる。別の大きな泡の生成方法としては、上記の搬送ポンプより供給された処理液と空気口からの空気を羽根状攪拌子で攪拌しながら、液に気泡を巻き込みながら大きな泡を生成させる構成や、上記の搬送ポンプより供給された処理液に空気供給ポンプ等でバブリングを行い大きな泡を生成する構成も望ましい。そして、大きな泡を回転円筒内に入れて、泡にせん断力を加えて、分泡して細かな泡とすることで、密度0.05g/cm以下の非常に密度の低い泡状処理剤を作ることができる。 FIG. 2 is a schematic diagram showing the configuration of the foam processing agent generating means in the image forming apparatus of the present embodiment. According to the foamy processing agent generating means 20 shown in the figure, the processing liquid 22 in the processing liquid container 21 is supplied to the gas / liquid mixing section 25 using liquid transporting means such as the transport pump 23 and the transport tube 24. The gas / liquid mixing unit 25 is provided with an air port 26. A negative pressure is generated in the air port 26 along with the flow of the liquid, and the gas is introduced from the air port 26 into the gas / liquid mixing unit 25. And a gas are mixed and further passed through the fine pore sheet 27, whereby a foam-like treatment agent with a large foam diameter can be generated. As another method of generating large bubbles, a configuration in which large bubbles are generated while entraining bubbles in the liquid while stirring the processing liquid supplied from the above-described transport pump and air from the air port with a blade-shaped stirrer, A configuration is also desirable in which large bubbles are generated by bubbling the processing liquid supplied from the above-described transport pump with an air supply pump or the like. Then, a large foam is put in a rotating cylinder, a shearing force is applied to the foam, and the foam is divided into fine foams, whereby a very low density foam treatment agent having a density of 0.05 g / cm 3 or less. Can be made.

図3は本実施の形態に係る画像形成装置における泡状処理剤付与装置の構成を示す概略図である。同図に示す本実施の形態の画像形成装置における泡状処理剤付与装置30は、図1の泡状処理剤付与手段10と図2の泡状処理剤生成手段20とを組み合わせた具体例である。中間転写体にインクジェットヘッドでインク液滴を付着させる前に、中間転写体に予め処理液を極少量で均一に付与することができる。泡状処理剤の塗布ローラ上の膜厚制御は、図4のようにブレードで行い、図4の(a)に示すように膜厚制御用ブレード12と塗布ローラ13面の隙間を狭くすると膜厚は薄くなり、図4の(b)に示すように膜厚制御用ブレード12と塗布ローラ13面の隙間を広くすると泡状処理剤の膜厚は厚くなる。なお、別の塗布として、図5のように、ベルトを用いた方法も考えられる。塗布ベルト17の曲率を有する部分に泡膜を制御する膜厚制御用ブレードを配置する。また、図6のように泡状処理剤付与手段における塗布ローラが中間転写体を兼ねているような構成のローラ18を設けて、装置の簡素化・小型化を図っても同等の効果が得られる。   FIG. 3 is a schematic diagram showing the configuration of the foam treatment agent application device in the image forming apparatus according to the present embodiment. The foam treatment agent application device 30 in the image forming apparatus of the present embodiment shown in the figure is a specific example in which the foam treatment agent application means 10 in FIG. 1 and the foam treatment agent generation means 20 in FIG. 2 are combined. is there. Before the ink droplets are attached to the intermediate transfer body with the ink jet head, the treatment liquid can be uniformly applied to the intermediate transfer body in a very small amount in advance. The film thickness of the foam treatment agent on the coating roller is controlled by a blade as shown in FIG. 4, and when the gap between the film thickness control blade 12 and the coating roller 13 is narrowed as shown in FIG. As shown in FIG. 4B, when the gap between the film thickness control blade 12 and the application roller 13 is widened, the film thickness of the foam treatment agent increases. As another application, a method using a belt as shown in FIG. 5 is also conceivable. A film thickness controlling blade for controlling the foam film is disposed on the portion of the coating belt 17 having the curvature. Further, as shown in FIG. 6, the roller 18 having a configuration in which the application roller in the foam processing agent applying means also serves as an intermediate transfer member is provided, and the same effect can be obtained even if the apparatus is simplified and downsized. It is done.

以上説明したように、本実施の形態の画像形成装置によれば、少ない処理液量でインク液滴との接触面積を大きくすることができ、中間転写体上における画像形成においてブリーディングやビーディング等の画質低下を防止するとともに、記録媒体への優れた転写性を実現できる。また、従来に比べ大幅に処理液の消費を抑えられるため低ランニングコストで高画質な画像の提供が可能となる。また、従来法に比べ大幅に処理液の消費を抑えられるため低ランニングコストで高画質な画像の提供が可能となる。更には、転写やクリーニングを繰り返し行うことによって中間転写体の表面に傷ができ、付与された処理液の厚みが部分によって異なってしまうという懸念があるが、処理液を泡で塗布することによって中間転写体に均一に付与できるという副次的効果もある。また、転写効率を高めるために一般に高表面エネルギー(高撥水性)の材料を使うことが望ましく、例えばシリコーンゴムなどが良く使われるが、泡でない一般的な塗布方法では液がはじかれてしまうため均一な塗布が難しい。そこで、処理液を泡化することにより、このような面に対しても均一なコーティングが実現できる。   As described above, according to the image forming apparatus of the present embodiment, the contact area with ink droplets can be increased with a small amount of processing liquid, and bleeding, beading, etc. in image formation on the intermediate transfer member. Image quality can be prevented, and excellent transferability to a recording medium can be realized. In addition, since the consumption of the processing liquid can be greatly suppressed as compared with the conventional case, it is possible to provide a high-quality image at a low running cost. In addition, since the consumption of the processing liquid can be significantly suppressed as compared with the conventional method, it is possible to provide a high-quality image at a low running cost. Furthermore, there are concerns that the surface of the intermediate transfer member can be scratched by repeated transfer and cleaning, and the thickness of the applied treatment liquid varies depending on the part. There is also a secondary effect that it can be uniformly applied to the transfer body. In order to increase the transfer efficiency, it is generally desirable to use a material with high surface energy (high water repellency) .For example, silicone rubber is often used. Uniform application is difficult. Therefore, uniform coating can be realized on such a surface by bubbling the treatment liquid.

次に、本発明における処理液の処方及び泡状処理剤生成装置の具体例について説明する。
下記処方にて処理液を作製する。
◇処理液処方
希釈溶媒:イオン交換水 53.6wt%
酸性部材:乳酸 20.0wt%
起泡剤:ミリスチルアミドプロピルベタイン(ビスターMAP 松本油脂工業) 2.0wt%
起泡剤:ステアリルジメチルアミノ酢酸ベタイン(アンヒトール86B 花王) 3.0wt%
増泡剤:プロピレングリコール 20.0wt%
増泡剤:ヤシ脂肪酸ジエタノールアミド(1:1)型(松本油脂 マーポンMM) 1.0wt%
水不溶脂肪酸:ミリスチン酸 0.4wt%
水に全ての材料を混合した後、70℃で湯せんしながら10分間ゆっくり攪拌し静置冷却し処理液とした。
Next, a specific example of the prescription of the treatment liquid and the foam treatment agent generating apparatus in the present invention will be described.
A treatment solution is prepared according to the following formulation.
◇ Treatment liquid formulation Diluting solvent: Ion exchange water 53.6 wt%
Acidic member: 20.0 wt% lactic acid
Foaming agent: Myristylamidopropyl betaine (Bicester MAP Matsumoto Yushi Kogyo) 2.0wt%
Foaming agent: Stearyldimethylaminoacetic acid betaine (Amphithol 86B Kao) 3.0wt%
Foam enhancer: Propylene glycol 20.0wt%
Foam enhancer: Palm fatty acid diethanolamide (1: 1) type (Matsumoto Yushi Marpon MM) 1.0wt%
Water-insoluble fatty acid: Myristic acid 0.4wt%
After all the materials were mixed in water, the mixture was slowly stirred for 10 minutes with a hot water bath at 70 ° C. and left to cool to obtain a treatment solution.

<泡状処理剤生成装置>
◇大きな泡生成部
図2を基に作製した。
処理液保存容器:PET樹脂からなるボトル
液搬送ポンプ:チューブポンプ(チューブ内径2mm、チューブ材質:シリコーンゴム)
搬送流路:内径2mmのシリコーンゴムチューブ
大きな泡を作るための微細孔シート:#400のステンレス製メッシュシート(開口部約40μm)
<Foam treatment agent generator>
◇ Large bubble generation part Made based on Fig.2.
Treatment liquid storage container: Bottle made of PET resin Liquid transfer pump: Tube pump (Tube inner diameter 2mm, Tube material: Silicone rubber)
Conveying flow path: Silicone rubber tube with an inner diameter of 2 mm Microporous sheet for creating large bubbles: # 400 stainless steel mesh sheet (opening approx. 40 μm)

◇微小な泡生成部
図2を基に作製した。
2重円筒の内側円筒は、回転軸に固定され、図示していない回転駆動モーターにより回転する。2重円筒の材質は、PET樹脂とした。外側円筒内径:10mm・長さ120mm、内側円筒外形:8mm・長さ100mmとした。回転数は、1000rpmから2000rpmの範囲で可変とした。
◇ A fine bubble generation part It produced based on FIG.
The inner cylinder of the double cylinder is fixed to a rotation shaft and is rotated by a rotation drive motor (not shown). The material of the double cylinder was PET resin. Outer cylindrical inner diameter: 10 mm / length 120 mm, inner cylindrical outer shape: 8 mm / length 100 mm. The number of rotations was variable in the range of 1000 rpm to 2000 rpm.

◇泡状処理剤付与手段及びインク液滴付着手段
図1を基に作製した。上記の微細な泡を生成する手段を用い、泡状処理剤を作成しブレードに供給する構成とした。
塗布ローラ:PFA樹脂を焼付け塗装したSUS製ローラ(φ30mm、長さ320mm)
膜厚制御ブレード:厚み2mm・幅50mm・高さ40mmのアルミ合金製支持板に厚み1mm・幅50mm・高さ20mmの並板ガラスを接着する。ガラス面を塗布ローラ側に向け、塗布ローラに沿って、6個並べ、各ブレードを回転可能(駆動機構は省略)とし、それぞれ10μmから100μmの範囲で塗布ローラとガラス面の隙間を個別に制御できるようにした。なお、中間転写体はシリコーンゴムからなるベルトを用い、搬送速度を150mm/sとした。
◇ Foaming treatment agent applying means and ink droplet adhesion means It was prepared based on FIG. Using the above-mentioned means for generating fine bubbles, a foam treatment agent was prepared and supplied to the blade.
Coating roller: SUS roller (φ30mm, length 320mm) coated with PFA resin by baking
Film thickness control blade: Adhering a parallel plate glass having a thickness of 1 mm, a width of 50 mm and a height of 20 mm to an aluminum alloy support plate having a thickness of 2 mm, a width of 50 mm and a height of 40 mm. With the glass surface facing the applicator roller, 6 blades are arranged along the applicator roller so that each blade can be rotated (the drive mechanism is omitted), and the gap between the applicator roller and the glass surface is individually controlled within the range of 10 to 100 μm. I was able to do it. Note that a belt made of silicone rubber was used as the intermediate transfer member, and the conveyance speed was 150 mm / s.

インク液滴付着手段として、市販インクジェットプリンタ(GX5000 リコー)を用いた。インクは、市販のインク(GC21K リコー)を使用した。上記の手段で泡状処理剤を中間転写体に付与後、液が乾燥しないタイミングで直ちに上記プリンタにてインクを吐出して印字した。   A commercially available inkjet printer (GX5000 Ricoh) was used as the ink droplet adhesion means. As the ink, a commercially available ink (GC21K Ricoh) was used. After the foam treatment agent was applied to the intermediate transfer member by the above means, ink was immediately discharged from the printer and printed at a timing when the liquid did not dry.

印字結果を下記の表1に示す。なお、記録媒体は上質紙(PPC用紙T−6200 リコー)を用いた。インク液滴の体積は約20plであった。   The printing results are shown in Table 1 below. The recording medium was high-quality paper (PPC paper T-6200 Ricoh). The volume of the ink droplet was about 20 pl.

次に、本発明における画像形成装置の実施例及び比較例の条件を示す。
[実施例1]
本発明の泡状処理剤生成装置を用いて泡化した泡状処理剤(密度:0.02g/cm)を中間転写体上に付与し、その後インク液滴を付着させ、記録媒体に転写した。ただし、泡状処理剤の中間転写上での厚みを30μm(A4換算で約37mg)とした。
[比較例1]
処理液を用いず中間転写体にインク液滴を付着させ、記録媒体に転写した。
[比較例2]
処理液を泡状にせずに中間転写体上に付与し、その後インク液滴を付着させ、記録媒体に転写した。ただし、処理液の中間転写体上での厚みを5μm(A4換算で約327mg)とした。
[比較例3]
処理液を泡状にせずに中間転写体上に付与し、その後インク液滴を付着させ、記録媒体に転写した。ただし、処理液の中間転写体上での厚みを1μm(A4換算で約65mg)とした。
実施例1と比較例1〜3を比較した結果を下記表1に示す。
Next, conditions of the examples and comparative examples of the image forming apparatus according to the present invention will be described.
[Example 1]
The foam treatment agent (density: 0.02 g / cm 3 ) foamed using the foam treatment agent production apparatus of the present invention is applied onto the intermediate transfer member, and then ink droplets are adhered and transferred to a recording medium. did. However, the thickness of the foamy treatment agent on the intermediate transfer was 30 μm (about 37 mg in terms of A4).
[Comparative Example 1]
Ink droplets were adhered to the intermediate transfer member without using the treatment liquid, and transferred to a recording medium.
[Comparative Example 2]
The treatment liquid was applied on the intermediate transfer member without forming a foam, and then ink droplets were adhered and transferred to a recording medium. However, the thickness of the treatment liquid on the intermediate transfer member was 5 μm (about 327 mg in terms of A4).
[Comparative Example 3]
The treatment liquid was applied on the intermediate transfer member without forming a foam, and then ink droplets were adhered and transferred to a recording medium. However, the thickness of the treatment liquid on the intermediate transfer member was 1 μm (about 65 mg in terms of A4).
The results of comparing Example 1 and Comparative Examples 1 to 3 are shown in Table 1 below.

なお、「カラーブリード」とは、それぞれの色を隣接するように印字し、その色間でのインクの滲み具合を評価したものである。
○:滲みがない
△:多少滲んでいる
×:滲みが多い
Note that “color bleed” is obtained by printing each color so as to be adjacent to each other and evaluating the degree of ink bleeding between the colors.
○: No bleeding Δ: Slightly blurred ×: Many bleeding

また、「中間転写体上での液流れ」とは、インク液滴を付与後と転写する直前での液滴の位置のずれ具合を評価したものである。
○:液流れがない
△:液流れが多少ある
×:液流れが多い
Further, “liquid flow on the intermediate transfer member” is an evaluation of the degree of displacement of the liquid droplets after the ink liquid droplets are applied and immediately before the transfer.
○: No liquid flow Δ: Some liquid flow ×: Many liquid flows

更に、「転写性」とは、中間転写体から記録媒体へ転写が確実に行われているかを評価したものである。
○:全て転写されている
△:転写残が多少ある
×:転写残が多い
Further, “transferability” is an evaluation of whether transfer from an intermediate transfer member to a recording medium is reliably performed.
○: All transferred △: There is a little transfer residue ×: There is a lot of transfer residue

また、「紙のカール・しわ」とは、転写が行われた後の記録媒体に関して、処理液やインクによってカールやしわができているかどうかを評価したものである。
○:カール・しわがない
△:カール・しわが多少ある
×:カール・しわが目立つ
Further, “paper curl / wrinkle” is an evaluation of whether or not curls or wrinkles are formed on the recording medium after the transfer is performed by the processing liquid or ink.
○: No curls / wrinkles △: Some curls / wrinkles ×: Curls / wrinkles are noticeable

Figure 0005370815
Figure 0005370815

上記表1のように本発明により、処理液を泡化した泡状処理剤を中間転写体上に付与することで処理液の量が微量でもにじみがなく転写性も良い画像が得られた。   As shown in Table 1, according to the present invention, an image having good transferability and no blur was obtained by applying a foam processing agent obtained by foaming the processing liquid onto the intermediate transfer member even when the amount of the processing liquid was very small.

なお、本発明は上記各実施の形態例に限定されるものではなく、特許請求の範囲内に記載であれば多種の変形や置換可能であることは言うまでもない。   The present invention is not limited to the above embodiments, and it goes without saying that various modifications and substitutions are possible as long as they are described in the scope of the claims.

10;泡状処理剤付与手段、11;泡状処理剤、
12;膜厚制御用ブレード、13;塗布ローラ、
14;中間転写体、15;インクジェットヘッド、
16;インク液滴、17;塗布ベルト、18;ローラ、
20;泡状処理剤生成手段、21;処理液容器、22;処理液、
23;搬送ポンプ、24;搬送チューブ、
25;気体・液体混合部、26;空気口、27;微細孔シート、
30;泡状処理剤付与装置。
10; Foam treatment agent application means, 11; Foam treatment agent,
12: Blade for film thickness control, 13: Application roller,
14; intermediate transfer member, 15; ink jet head,
16; ink droplet, 17; coating belt, 18; roller,
20; Foam treatment agent generating means, 21; treatment liquid container, 22; treatment liquid,
23; transfer pump, 24; transfer tube,
25; gas / liquid mixing section, 26; air port, 27; microporous sheet,
30; Foam treatment agent applicator.

特開2001−301138号公報JP 2001-301138 A 特開2002−370441号公報JP 2002-370441 A 特開2007−268802号公報JP 2007-268802 A

Claims (2)

インク中の色材と反応する反応剤を含む処理液を泡状にする処理液泡状化手段と、
予め中間転写体上に泡状処理剤を付与する泡状処理剤付与手段と、
泡状処理剤が付与された中間転写体上に、画像情報に応じて液滴化したインクを付着させ、付着したインクを記録媒体に転写して記録媒体に画像を記録する記録手段と
を有することを特徴とする画像形成装置。
A processing liquid foaming means for foaming a processing liquid containing a reactive agent that reacts with a colorant in the ink;
A foam treatment agent applying means for applying a foam treatment agent on the intermediate transfer member in advance;
The foam treatment agent on the intermediate transfer member granted, to adhere the ink liquid droplets in accordance with the images information, and recording means for recording an image on a recording medium by transferring the deposited ink on the recording medium An image forming apparatus comprising:
前記処理液は、カチオン性部材または水を酸性化する部材と、起泡剤として非イオン性界面活性剤または両性界面活性剤と、水に不溶な水不溶脂肪酸とを含有することを特徴とする請求項1記載の画像形成装置。   The treatment liquid contains a cationic member or a member that acidifies water, a nonionic surfactant or an amphoteric surfactant as a foaming agent, and a water-insoluble fatty acid that is insoluble in water. The image forming apparatus according to claim 1.
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