JP2007063583A - Method for regenerating lithographic printing plate support - Google Patents
Method for regenerating lithographic printing plate support Download PDFInfo
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- JP2007063583A JP2007063583A JP2005248357A JP2005248357A JP2007063583A JP 2007063583 A JP2007063583 A JP 2007063583A JP 2005248357 A JP2005248357 A JP 2005248357A JP 2005248357 A JP2005248357 A JP 2005248357A JP 2007063583 A JP2007063583 A JP 2007063583A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
Description
本発明は、使用済み平版印刷版用支持体の再生方法に関し、詳細には、使用済み平版印刷版支持体より高純度のアルミニウム再生地金を得ることができる平版印刷版支持体の再生方法に関する。 The present invention relates to a method for regenerating a used lithographic printing plate support, and more particularly, to a method for regenerating a lithographic printing plate support capable of obtaining a high-purity aluminum recycled metal from a used lithographic printing plate support. .
平版印刷版の支持体は表面親水性が高いことを要するため、高純度のアルミニウム板が用いられているのが一般的である。即ち、平版印刷版は、アルミニウムを主成分とする板状の原料を粗面化処理等の表面処理を施して得られる支持体表面に、画像記録層を設けてなるものであり、露光および現像を経た後、印刷機上に装着され、インキおよび湿し水を供給されて、印刷に供される。
印刷に用いられた後の使用済み平版印刷版は、前記アルミニウム板表面に、インキが付着した画像記録層が残存しており、支持体に用いられる高純度アルミニウムに再利用するにあたり、特に付着したインキが問題となり、できるだけ高効率で高純度アルミニウム原材料として再生する技術が望まれている。
Since the support of the lithographic printing plate needs to have high surface hydrophilicity, a high-purity aluminum plate is generally used. That is, a lithographic printing plate is obtained by providing an image recording layer on the surface of a support obtained by subjecting a plate-shaped raw material mainly composed of aluminum to a surface treatment such as a roughening treatment, and exposing and developing. After passing through, it is mounted on a printing press, supplied with ink and fountain solution, and used for printing.
The used lithographic printing plate after being used for printing had an image recording layer on which the ink was adhered on the surface of the aluminum plate, and was particularly adhered to the high-purity aluminum used for the support. Ink becomes a problem, and a technique for recycling as high-purity aluminum raw material as efficiently as possible is desired.
アルミニウムは資源として有用であり、高純度の再生方法については種々の提案がなされている。例えば、脂系塗布膜が表面に形成されているアルミ塗布材の再生方法として、予熱炉300〜550℃内に2〜24時間放置し、樹脂を除去する工程を実施した後、溶解炉に投入する方法が提案されている（例えば、特許文献１参照。）。この方法は、樹脂類の除去には有用であるが、平版印刷版には顔料として重金属類を含有するインキが用いられており、インクに含まれている重金属類はこの方法では除去されず、溶解時アルミ中に混入し、アルミ純度が低下するという問題を有している。 Aluminum is useful as a resource, and various proposals have been made for a high-purity recycling method. For example, as a method of reclaiming aluminum coating material with a grease-based coating film on its surface, leave it in a preheating furnace at 300 to 550 ° C for 2 to 24 hours, perform the process of removing the resin, and then put it in the melting furnace A method has been proposed (see, for example, Patent Document 1). Although this method is useful for removing the resins, the lithographic printing plate uses an ink containing heavy metals as a pigment, and the heavy metals contained in the ink are not removed by this method. There is a problem that aluminum purity is lowered by mixing in aluminum during melting.
また、インクと残存する記録層とを除去するために、Ｓｉ成分を含有する研磨パミスを含む研磨液を供給しながら研磨ブラシで処理する方法が記載されている（例えば、特許文献２参照。）。この方法では、記録層とともにインクも除去されるため、インクに起因す
る重金属の問題は解消されるが、アルミニウムも同時に研磨され、回収率が低下したり、パミスが表面にささって残ることがあり、溶解時アルミに混入して、アルミ純度低下の原因となっている。同様に、酸、アルカリで処理して記録層やインクを除去する場合にも、アルミニウムの溶解による回収率の低下が生じる問題がある。
このように、単なる加熱による前処理によっては、インクに含まれる重金属を除去できず、また、物理的、化学的除去によってアルミニウム板自体が損傷したり、或いは、研磨工程に起因する新たな不純物の混入も予想されるため、さらなる改良が望まれているのが現状である。
Moreover, in order to remove the ink and the remaining recording layer, a method of processing with a polishing brush while supplying a polishing liquid containing a polishing pumice containing a Si component is described (for example, see Patent Document 2). . In this method, the ink is removed together with the recording layer, so the problem of heavy metal caused by the ink is solved. However, aluminum is also polished at the same time, and the recovery rate may be lowered, or the pumice may remain on the surface. When mixed, it mixes with aluminum, causing a drop in aluminum purity. Similarly, when the recording layer or ink is removed by treatment with acid or alkali, there is a problem that the recovery rate is lowered due to dissolution of aluminum.
As described above, the heavy metal contained in the ink cannot be removed by pretreatment by simple heating, the aluminum plate itself is damaged by physical or chemical removal, or new impurities due to the polishing process are removed. Since contamination is also expected, further improvement is desired at present.
即ち、従来、印刷済み平版印刷版のアルミから作られた再生地金はインクに含有している有機顔料、例えば、フタロシアニンのＣｕ等、がアルミに混入するため純度を確保できず、低純度アルミ製品用原料としてリサイクルされており（カスケード リサイクル）、再度、平版印刷版用アルミ原料として使用可能なリサイクル（product to productリサイクル）が望まれていた。
上記問題点を考慮してなされた本発明の目的は、使用済み平版印刷版支持体より、不純物の混入がない高純度のアルミニウムを効率よく再生しうる平版印刷版支持体の再生方法を提供することにある。 An object of the present invention made in consideration of the above problems is to provide a method for regenerating a lithographic printing plate support that can efficiently regenerate high-purity aluminum free from impurities from a used lithographic printing plate support. There is.
本発明者は、鋭意検討の結果、使用済み平版印刷版のインクをアルミニウム板に損傷を与えることなく除去する工程を実施することで本発明の目的を達成しうることを見出し、本発明を完成した。
即ち、本発明の使用済み平版印刷版支持体の再生方法は、アルミニウムを含有する使用済み平版印刷版支持体を、有機溶剤と界面活性剤とを含有する中性水溶液で処理して、平版印刷版表面に付着したインキを除去するインキ除去工程を有することを特徴とする。
本発明においては、前記インキ除去工程の後、アルミニウムを含有する使用済み平版印刷版支持体を溶解炉で溶解させ、アルミニウム溶湯を得る工程を実施することにより、高純度のアルミニウム原料を得ることができる。
As a result of intensive studies, the present inventor has found that the object of the present invention can be achieved by carrying out a step of removing the ink of the used lithographic printing plate without damaging the aluminum plate, thereby completing the present invention. did.
That is, in the method for regenerating a used lithographic printing plate support of the present invention, a used lithographic printing plate support containing aluminum is treated with a neutral aqueous solution containing an organic solvent and a surfactant, and lithographic printing is performed. It has the ink removal process of removing the ink adhering to the plate surface.
In the present invention, after the ink removing step, a used lithographic printing plate support containing aluminum is melted in a melting furnace to obtain a molten aluminum, thereby obtaining a high-purity aluminum raw material. it can.
なお、本発明の平版印刷版支持体の再生方法において用いられる中性水溶液のｐＨは、４．５〜９．５の範囲にあることが好ましく、また、該中性水溶液には有機溶剤を１０〜４５質量％の範囲で、界面活性剤を１０〜４５質量の範囲でそれぞれ含有することが好ましい。
ここで用いられる有機溶剤としては、環構造を有するものが好ましく、例えば、ベンジルアルコール、２−フェノキシエタノールから選択される１種以上であることが好ましい態様である。また、併用される界面活性剤としては使用される有機溶剤を水に４０％以上可溶化することができる界面活性剤を選択して用いることが好ましい。
The pH of the neutral aqueous solution used in the method for regenerating a lithographic printing plate support of the present invention is preferably in the range of 4.5 to 9.5, and the neutral aqueous solution contains 10 organic solvents. It is preferable that the surfactant is contained in the range of 10 to 45% by mass in the range of ˜45% by mass.
As an organic solvent used here, what has a ring structure is preferable, for example, it is a preferable aspect that it is 1 or more types selected from benzyl alcohol and 2-phenoxyethanol. Further, as the surfactant used in combination, it is preferable to select and use a surfactant that can solubilize the organic solvent used in water by 40% or more.
なお、本発明で再生の対象となる使用済み平版印刷版支持体としては、画像形成されインクを供給されて実際に印刷に使用されたもののみならず、工程トラブルや抜き取り検査で使用に供されなかった汚れやキズが付着した平版印刷版の支持体も包含されることはいうまでもない。また、本発明の再生方法により、平版印刷版の切断屑などからのアルミニウムの再生も可能である。ただし、印刷インキの付着した平版印刷版の支持体の再生に使用した場合に、本発明の効果がより顕著である。 Note that the used lithographic printing plate support to be reproduced in the present invention is not only used for image formation and ink supplied and actually used for printing, but also used for process trouble and sampling inspection. Needless to say, a support of a lithographic printing plate to which dirt or scratches that have not been attached is also included. Moreover, the reproduction | regeneration method of this invention can also reproduce | regenerate aluminum from the cutting waste etc. of a lithographic printing plate. However, the effect of the present invention is more conspicuous when used to regenerate a lithographic printing plate support to which printing ink is adhered.
本発明によれば、使用済み平版印刷版支持体より、不純物の混入がない高純度のアルミニウムを効率よく再生しうる平版印刷版支持体の再生方法を提供することができる。 ADVANTAGE OF THE INVENTION According to this invention, the reproduction | regeneration method of the lithographic printing plate support body which can reproduce | regenerate the high purity aluminum which does not mix an impurity from a used lithographic printing plate support body efficiently can be provided.
以下、本発明について詳細に説明する。
本発明の使用済み平版印刷版支持体の再生方法は、アルミニウムを含有する使用済み平版印刷版支持体を、有機溶剤と界面活性剤とを含有する中性水溶液で処理して、平版印刷版表面に付着したインキを除去するインキ除去工程を含有することを特徴とする。
また、前記インキ除去工程の後、アルミニウムを含有する使用済み平版印刷版支持体を溶解炉で溶解させ、アルミニウム溶湯を得る工程を実施することができる。以下、本発明の方法について順次説明する。
Hereinafter, the present invention will be described in detail.
The method for regenerating a used lithographic printing plate support according to the present invention comprises treating a used lithographic printing plate support containing aluminum with a neutral aqueous solution containing an organic solvent and a surfactant to obtain a lithographic printing plate surface. And an ink removing process for removing ink adhering to the ink.
In addition, after the ink removing step, a used lithographic printing plate support containing aluminum can be melted in a melting furnace to obtain a molten aluminum. Hereinafter, the method of the present invention will be described sequentially.
〔付着物除去工程〕
本発明の再生方法においては、前記インキ除去工程に先立って、使用済み平版印刷版の汚れ、埃などの固形付着物を除去する工程を行うことができる。
例えば、使用時、或いは、回収、保存時に付着した汚れや埃などをあらかじめ除去しておくことにより、インキ除去工程における中性水溶液に不純物が混入するのが抑制できる。この付着物を除去する工程には、水又は界面活性剤を含む水による洗浄方法、アルミニウム板表面を傷付けない程度の、研磨ブラシ、研磨布などを用いた弱研磨方法、高圧エアーまたは高圧ジェット水などを用いたブラスト処理方法などを適用することができる。
[Adherent removal process]
In the regeneration method of the present invention, prior to the ink removing step, a step of removing solid deposits such as dirt and dust on the used lithographic printing plate can be performed.
For example, it is possible to prevent impurities from being mixed into the neutral aqueous solution in the ink removing process by removing in advance the dirt or dust attached during use, recovery or storage. The step of removing the deposits includes a cleaning method using water or water containing a surfactant, a weak polishing method using a polishing brush, a polishing cloth or the like that does not damage the surface of the aluminum plate, high-pressure air or high-pressure jet water. A blasting method using the above can be applied.
〔インキ除去工程〕
この工程では、アルミニウムを含有する使用済み平版印刷版支持体を、有機溶剤と界面活性剤とを含有する中性水溶液で処理して、インキを除去する。
ここで用いられる中性水溶液は、インクを溶解しうる有機溶剤と、有機溶剤を水に可溶化させる界面活性剤と溶媒としての水を含有する。本発明における中性水溶液は、ｐＨが４．５〜９．５であることが好ましい。アルミニウム板は酸又はアルカリによって溶解しやすく、酸又はアルカリ水溶液で処理すると支持体を形成するアルミニウムが溶出し、アルミニウムの再生効率を低下させるため好ましくない。ｐＨはより好ましくは５．０〜９．０の範囲である。
[Ink removal process]
In this step, the used lithographic printing plate support containing aluminum is treated with a neutral aqueous solution containing an organic solvent and a surfactant to remove the ink.
The neutral aqueous solution used here contains an organic solvent that can dissolve the ink, a surfactant that solubilizes the organic solvent in water, and water as a solvent. The neutral aqueous solution in the present invention preferably has a pH of 4.5 to 9.5. The aluminum plate is easily dissolved by acid or alkali, and treatment with an acid or alkali aqueous solution is not preferable because aluminum forming the support is eluted and decreases the regeneration efficiency of aluminum. The pH is more preferably in the range of 5.0 to 9.0.
中性水溶液に用いられ得る有機溶剤は、少なくともインクを溶解除去する機能を有し、且つ、アルミニウムに影響を与えないものを選択することが好ましい。また、中性水溶液調製の容易性からは、界面活性剤により水或いは水系の溶媒に溶解しうるものが好ましい。このような観点からは、鎖状構造を持つものに比較して、環構造を有するものが好ましく、アリール基などの不飽和環状炭化水素基と親水性の官能基とを有するものが好ましく、具体的には、ベンジルアルコール、２−フェノキシエタノール、２−アニリノエタノールなどが挙げられ、なかでも、ベンジルアルコールが好ましい。
中性水溶液中の有機溶剤の量は、インクの種類や付着状態により適宜選択することができるが、固形分で１０〜４５質量％の範囲であることが好ましく、さらに好ましくは、１５〜４０質量％の範囲である。上記好ましい範囲において、アルミニウム板への影響を抑制しつつ、高いインク除去性を得ることができる。
As the organic solvent that can be used in the neutral aqueous solution, it is preferable to select an organic solvent that has at least a function of dissolving and removing the ink and that does not affect aluminum. In view of the ease of preparing the neutral aqueous solution, those that can be dissolved in water or an aqueous solvent by a surfactant are preferable. From this point of view, those having a ring structure are preferable compared to those having a chain structure, and those having an unsaturated cyclic hydrocarbon group such as an aryl group and a hydrophilic functional group are preferable. Specifically, benzyl alcohol, 2-phenoxyethanol, 2-anilinoethanol and the like can be mentioned, and among them, benzyl alcohol is preferable.
The amount of the organic solvent in the neutral aqueous solution can be appropriately selected depending on the type of ink and the state of adhesion, but is preferably in the range of 10 to 45% by mass, more preferably 15 to 40% by mass. % Range. In the above preferred range, high ink removability can be obtained while suppressing the influence on the aluminum plate.
前記有機溶剤とともに中性水溶液に含まれる界面活性剤は、使用する有機溶剤を４０〜１００質量％程度、水もしくは水系溶媒に可溶化しうるものであれば特に制限はなく、アニオン系界面活性剤、両性界面活性剤、非イオン性界面活性剤、カチオン界面活性剤のいずれであってもよい。有機溶剤の溶解性の観点からはアニオン界面活性剤であることが好ましく、例えば、アルキルアリールスルホン酸塩類、アルカンスルホン酸塩類、脂肪酸塩類等が挙げられ、なかでも、ブチルナフタレンスルホン酸ナトリウムが好ましい。
中性水溶液中の界面活性剤の量は、併用する有機溶剤の種類や量により適宜選択することができるが、固形分で１０〜４５質量％の範囲であることが好ましく、さらに好ましくは、１５〜４０質量％の範囲である。上記好ましい範囲において、有機溶剤の溶解性を確保し、高いインク除去性を得ることができる。
The surfactant contained in the neutral aqueous solution together with the organic solvent is not particularly limited as long as the organic solvent to be used can be solubilized in about 40 to 100% by mass of water or an aqueous solvent, and is an anionic surfactant. Any of amphoteric surfactants, nonionic surfactants, and cationic surfactants may be used. From the viewpoint of the solubility of the organic solvent, an anionic surfactant is preferable, and examples thereof include alkylaryl sulfonates, alkane sulfonates, fatty acid salts, and the like. Among them, sodium butylnaphthalene sulfonate is preferable.
The amount of the surfactant in the neutral aqueous solution can be appropriately selected depending on the type and amount of the organic solvent to be used together, but is preferably in the range of 10 to 45% by mass, more preferably 15% by solid content. It is in the range of ˜40% by mass. In the above preferred range, the solubility of the organic solvent can be ensured and high ink removability can be obtained.
中性水溶液には、上述の有機溶剤、界面活性剤、及び、溶媒となる水に加え、本発明の効果を損なわない限りにおいて、目的に応じて種々の併用成分を用いることができる。
例えば、消泡剤、ｐＨ調整剤、粘度調整剤、キレート剤などを挙げることができる。
In the neutral aqueous solution, various combined components can be used depending on the purpose as long as the effects of the present invention are not impaired, in addition to the organic solvent, the surfactant, and the water used as the solvent.
Examples thereof include an antifoaming agent, a pH adjusting agent, a viscosity adjusting agent, and a chelating agent.
処理対象物である使用済み平版印刷版を中性水溶液で処理する方法としては、例えば、使用済み平版印刷版を、中性水溶液に浸漬する方法、中性水溶液を使用済み平版印刷版表面にスプレーやシャワーにより適用する方法が挙げられ、なかでも、インク除去性や数多くの平版印刷版を処理できるという観点からは、浸漬法が好ましい。
浸漬は、液温１５〜４５℃の中性水溶液を満たした液浴に、２０〜３００分分間浸漬することが好ましい。
液浴中に浸漬する際、複数の平版印刷版を積層して浸漬することができる。使用済みの平版印刷版はドラムにセットするための爪部を有し、且つ、湾曲していることから、複数枚を積層しても、処理対象である記録層を有するインク付着面と中性水溶液との接触が妨げられることはない。
インク除去効率向上の観点からは、浸漬中に機械的振動や超音波による振動を与える、液浴中に気体を吹き込みバブリングする、或いは、液浴中の中性水溶液を攪拌する、などの処理を行うことが好ましい。
浸漬は１回に複数枚の平版印刷版を処理する方法で行ってもよく、また、液浴中を、平版印刷版を搬送しながら通過させて連続的に処理する方法で行ってもよい。
Examples of a method for treating a used lithographic printing plate, which is an object to be treated, with a neutral aqueous solution include a method in which a used lithographic printing plate is immersed in a neutral aqueous solution, or a neutral aqueous solution is sprayed on the surface of a used lithographic printing plate. In particular, from the viewpoint of ink removability and the ability to process many lithographic printing plates, the dipping method is preferred.
The immersion is preferably performed for 20 to 300 minutes in a liquid bath filled with a neutral aqueous solution at a liquid temperature of 15 to 45 ° C.
When dipping in a liquid bath, a plurality of planographic printing plates can be laminated and dipped. A used lithographic printing plate has a claw portion for setting on a drum and is curved, so even if a plurality of sheets are laminated, an ink adhering surface having a recording layer to be processed and neutral Contact with the aqueous solution is not hindered.
From the viewpoint of improving the ink removal efficiency, processing such as applying mechanical vibration or ultrasonic vibration during immersion, bubbling by blowing gas into the liquid bath, or stirring the neutral aqueous solution in the liquid bath. Preferably it is done.
Immersion may be performed by a method of processing a plurality of lithographic printing plates at a time, or may be performed by a method of continuously processing the lithographic printing plate by passing it through a liquid bath.
中性水溶液によるインク除去工程が終了した後、処理液を除去するため、洗浄処理を行うことが好ましい。洗浄処理は、例えば、平版印刷版の表面（記録層が存在する面）に、水洗水をスプレー等により吹きかけつつ、ナイロンブラシでこする方法、水洗浴中を搬送することで洗浄する方法などが挙げられる。
洗浄処理の後、水分を除去する乾燥処理を行うのが好ましい。乾燥処理は、公知の方法、例えば、非接触型ヒーター、エアーナイフ、熱風吹き付け装置等の乾燥装置を用いる方法で行うことができる。
After the ink removal step using a neutral aqueous solution is completed, it is preferable to perform a cleaning treatment in order to remove the treatment liquid. The cleaning treatment includes, for example, a method of rubbing with a nylon brush while spraying washing water on the surface of the planographic printing plate (surface on which the recording layer exists) with a spray, a method of washing by transporting in a washing bath, and the like. Can be mentioned.
After the cleaning process, it is preferable to perform a drying process to remove moisture. A drying process can be performed by a well-known method, for example, the method of using drying apparatuses, such as a non-contact type heater, an air knife, a hot air spraying apparatus.
このようにして平版印刷版として使用されたものと同様の高純度のアルミニウム板（再生地金）を得ることがでる。このアルミニウム板を溶融してアルミニウム溶湯とする。 Thus, a high-purity aluminum plate (recycled metal) similar to that used as a lithographic printing plate can be obtained. This aluminum plate is melted to form a molten aluminum.
インクを除去した使用済み平版印刷版は、さらに溶解炉で溶解させ、アルミニウム溶湯とすることで新たなアルミ原材料を得ることができる。
本工程においては、アルミニウム溶湯の原材料として、インクを除去された使用済み平版印刷版のみを用いることで、高純度のアルミニウム原料を得ることができる。得られたアルミニウムの純度が高いため、そのまま板状に加工して平版印刷版の支持体用とすることもでき、アルミニウム溶湯の原材料として、アルミニウムインゴットを作製することもできる。さらに、Ｆｅ、Ｓｉ、Ｃｕ、Ｍｇ、Ｍｎ、Ｚｎ等の元素を含むアルミニウム母合金を用いて、任意の組成に容易に調整することもできる。
The used lithographic printing plate from which the ink has been removed can be further melted in a melting furnace to form a molten aluminum, whereby a new aluminum raw material can be obtained.
In this step, a high-purity aluminum raw material can be obtained by using only the used lithographic printing plate from which the ink has been removed as the raw material for the molten aluminum. Since the purity of the obtained aluminum is high, it can be processed into a plate shape as it is for a support of a lithographic printing plate, and an aluminum ingot can be produced as a raw material for molten aluminum. Furthermore, the composition can be easily adjusted to an arbitrary composition by using an aluminum mother alloy containing an element such as Fe, Si, Cu, Mg, Mn, or Zn.
本発明においては、再生されたアルミニウム溶湯に溶湯処理を行うのが好ましい。溶湯処理は、非金属不純物やその燃焼ガス、酸化物等を除去するとともに、アルミニウム溶湯中に溶け込んだＨ2ガスやＮａを除去することを目的として行われる。
溶湯処理の方法としては、フラックス、ガス、フィルター等の公知の方法を適宜用いることができる。中でも、第一の溶湯処理層においてガスを用いる溶湯処理を行い、ついで、第二の溶湯処理層においてフィルターを用いる溶湯処理を行う２段階での溶湯処理が好ましい。
In the present invention, it is preferable to perform molten metal treatment on the regenerated molten aluminum. The molten metal treatment is performed for the purpose of removing non-metallic impurities, combustion gases, oxides, and the like, and removing H 2 gas and Na dissolved in the molten aluminum.
As a method for the molten metal treatment, known methods such as flux, gas, and filter can be appropriately used. Among them, a two-stage molten metal treatment is preferable in which a molten metal treatment using a gas is performed in the first molten metal treatment layer, and then a molten metal treatment using a filter is performed in the second molten metal treatment layer.
再生により得られたアルミニウム溶湯を用いて、支持体用のアルミニウム板を形成する方法は、公知の方法を適用することができる。代表的な方法としては、アルミニウム溶湯を用いてスラブ（例えば、厚さ４００〜６００ｍｍ、幅１０００〜２０００ｍｍ、長さ２〜２０ｍ）を鋳造する。スラブ表面の不純物部分を面削機にかけて３〜１０ｍｍずつ切削して不純物を面削により除去した後、スラブ内部の応力の除去と組織の均一化のため、均熱炉において４８０〜５４０℃、６〜１２時間保持する均熱化処理工程を行う。その後、熱間圧延を４８０〜５４０℃で行い、厚さ１〜４０ｍｍとした後、室温で冷間圧延を行い、所望の厚さとする。その後、組織の均一化のため焼鈍を行い、圧延組織等を均質化した後、冷間圧延を行い所望の厚さとし、更に、矯正を行って、平坦度のよいアルミニウム板を得る。
得られたアルミニウム板はインクに起因する重金属などの混入が抑制された高純度アルミニウム板であり、平版印刷版用支持体、その他、高純度であることを要する種々の用途に利用することができる。
A publicly known method can be applied to a method of forming an aluminum plate for a support using a molten aluminum obtained by regeneration. As a typical method, a slab (for example, a thickness of 400 to 600 mm, a width of 1000 to 2000 mm, and a length of 2 to 20 m) is cast using molten aluminum. Impurities on the surface of the slab are cut by 3 to 10 mm using a face mill and the impurities are removed by face milling. Then, in order to remove the stress inside the slab and make the structure uniform, the temperature is 480 to 540 ° C., A soaking process is performed for 12 hours. Thereafter, hot rolling is performed at 480 to 540 ° C. to obtain a thickness of 1 to 40 mm, and then cold rolling is performed at room temperature to obtain a desired thickness. Thereafter, annealing is performed to make the structure uniform, the rolled structure and the like are homogenized, cold rolling is performed to obtain a desired thickness, and correction is performed to obtain an aluminum plate with good flatness.
The obtained aluminum plate is a high-purity aluminum plate in which the mixing of heavy metals and the like resulting from ink is suppressed, and can be used for a lithographic printing plate support and other various uses that require high purity. .
得られたアルミニウム板を平版印刷版原版の支持体として用いる場合には、公知の表面処理、陽極酸化処理、所望により実施される親水化処理などを行えばよい。
本発明の再生方法によれば、アルミニウムをエッチングすることなく、処理が可能であり、アルミニウムの回収率が低下する懸念がなく、さらに、熱処理では除去できない重金属なども効果的に除去しうるため、高純度を確保できるという利点をも有するものである。
When the obtained aluminum plate is used as a support for a lithographic printing plate precursor, a known surface treatment, anodizing treatment, hydrophilization treatment carried out as desired may be performed.
According to the regeneration method of the present invention, it is possible to perform processing without etching aluminum, there is no concern that the recovery rate of aluminum is reduced, and it is possible to effectively remove heavy metals that cannot be removed by heat treatment. It also has the advantage of ensuring high purity.
以下に実施例を示して本発明を具体的に説明する。ただし、本発明はこれらに限られるものではない。
（実施例１）
（印刷済み平版印刷版から再生地金を製造する）
（ａ）使用済み平版印刷版
表面に画像記録層が残存しインキが付着した使用済み平版印刷版（支持体原材料としてＪＩＳ １０５０材使用、アルミ純度：９９．６０％、富士フイルム製、ＰＳ版 ＶＳ（商品名））にインク：エコピュアＳＯＹ、藍（サカタＩＮＫＳ製）を供給して印刷を行った。使用後の平版印刷版表面におけるインクの付着量は約２０g/ｍ2であった。
The present invention will be specifically described below with reference to examples. However, the present invention is not limited to these.
Example 1
(Manufactures recycled bullion from printed lithographic printing plates)
(A) Used lithographic printing plate Used lithographic printing plate with an image recording layer remaining on the surface and ink adhering (using JIS 1050 as a support material, aluminum purity: 99.60%, manufactured by Fuji Film, PS plate VS (Trade name)) was supplied with ink: Eco-pure SOY, indigo (manufactured by Sakata INKS) for printing. The amount of ink deposited on the lithographic printing plate surface after use was about 20 g / m 2 .
（ｂ）インク除去工程
印刷済みＰＳ版は、回収された後、箱などに積み重ねられているので、版同士がインク等で固着している。このため、箱から平版印刷版を取り出し、事前に版同士を別々分離した後、以下に示す組成の中性水溶液に、互いに固着したままの平版印刷版１００枚を、そのまま中性水溶液に浸漬しインクを除去する。版と版の間への中性水溶液の浸透を確実のものにするため、版に物理的な振動（３〜４回／分）を与える、また、用いた中性水溶液の温度は２５℃であり、浸漬時間は４時間（温度：２５℃）である。
(B) Ink removal process Since the printed PS plates are collected and then stacked in a box or the like, the plates are fixed to each other with ink or the like. For this reason, after taking out the lithographic printing plate from the box and separating the plates separately in advance, 100 lithographic printing plates that remain fixed to each other are immersed in the neutral aqueous solution as they are in the neutral aqueous solution having the composition shown below. Remove ink. In order to ensure the penetration of the neutral aqueous solution between the plates, the plate is physically vibrated (3-4 times / min), and the temperature of the neutral aqueous solution used is 25 ° C. Yes, the immersion time is 4 hours (temperature: 25 ° C.).
（中性水溶液の処方）
・ベンジルアルコール（有機溶剤） ２０％
・ブチルナフタレンスルホン酸ナトリウム（界面活性剤） ２０％
・水 ６０％
浸漬後、水洗水スプレーを行い、乾燥装置により１００℃の熱風吹き付けを行い、完全に乾燥した。
この処理によりインクを除去された使用済み平版印刷版を溶解炉に投入し、７５０℃で溶解した後、アルミニウム溶湯として分析を行い、収率と純度を確認した。
収率は、再生地金重量／印刷済みＰＳ版重量（インク除去）により算出した。
純度は、発光分光分析器で測定した。
結果を、下記表１に示す。なお、対照例１として、インクを供給して印刷する前の印刷版（インク付着せず）、対照例２としてインクが付着したままの印刷版を、それぞれ同様に溶解炉に投入して収率と純度を確認した。結果を表１に併記した。
(Neutral aqueous formulation)
・ Benzyl alcohol (organic solvent) 20%
・ Sodium butylnaphthalenesulfonate (surfactant) 20%
・ Water 60%
After the immersion, washing with water was sprayed, and hot air was sprayed at 100 ° C. with a drying device to completely dry.
The used lithographic printing plate from which ink was removed by this treatment was put in a melting furnace and melted at 750 ° C., and then analyzed as a molten aluminum to confirm the yield and purity.
The yield was calculated from the weight of recycled metal / printed PS plate weight (ink removal).
Purity was measured with an emission spectrometer.
The results are shown in Table 1 below. In addition, as control example 1, a printing plate before ink was supplied for printing (no ink adhesion), and as a control example 2, a printing plate with ink attached thereto was put into a melting furnace in the same manner, respectively. And the purity was confirmed. The results are also shown in Table 1.
表１に明らかなように、本発明の再生方法により得られたアルミニウム板は、使用前の平版印刷版の支持体と同等の純度を維持し、回収率も極めて高いことがわかる。また、対照例２より、インクを付着したまま溶解すると、インクに起因する重金属のため、純度が低下することがわかる。 As is apparent from Table 1, the aluminum plate obtained by the recycling method of the present invention maintains the same purity as that of the lithographic printing plate support before use, and the recovery rate is extremely high. Moreover, it can be seen from Control Example 2 that when the ink is dissolved while adhering, the purity decreases due to the heavy metal resulting from the ink.
（比較例１：熱によるインクの除去）
実施例１で用いた印刷済みの平版印刷版を準備し、それを、予熱炉内に導入して予熱温度４００℃で１時間予熱した後、予熱炉から取り出し、実施例１と同様に溶解炉に投入して、７５０℃で溶解した。
実施例１と同様に、回収率と純度を確認した。
(Comparative Example 1: Removal of ink by heat)
A printed lithographic printing plate used in Example 1 was prepared, introduced into a preheating furnace, preheated at a preheating temperature of 400 ° C. for 1 hour, taken out from the preheating furnace, and the melting furnace as in Example 1 And dissolved at 750 ° C.
As in Example 1, recovery and purity were confirmed.
（比較例２：研磨材によるインクの除去）
実施例１で用いた印刷済みの平版印刷版を準備し、くわえ部によりベルトコンベアに固定して搬送しつつ、研磨材（パミス）と水との懸濁液（比重１．１２）を研磨スラリー液として表面に供給して、回転するローラ状研磨ブラシを押し当てて、画像記録層およびインキを除去した。ローラ状研磨ブラシを押し当てた部分は、ベルトコンベアの裏側から、受け板で支持した。
研磨材の平均粒径は４０μｍ、最大粒径は１００μｍであった。研磨ブラシの材質は６・１０ナイロン、毛長は５０ｍｍ、毛の直径は０．３ｍｍであった。研磨ブラシはφ３００ｍｍのステンレス製の筒に穴をあけて密になるように植毛した。研磨ブラシは３本使用した。研磨ブラシは研磨ブラシを回転させる駆動モータの負荷が、研磨ブラシをアルミニウム板に押さえつける前の負荷に対して７ｋＷプラスになるまで押さえつけた。研磨ブラシの回転方向はアルミニウム板の移動方向と同じであった。研磨ブラシの回転数は２００ｒｐｍであった。
インクと画像記録層除去後の平版印刷版を実施例１と同様に溶解炉に投入して、７５０℃で溶解し、実施例１と同様に、回収率と純度を確認した。
(Comparative Example 2: Removal of ink by abrasive)
A printed planographic printing plate used in Example 1 was prepared, and a suspension (specific gravity 1.12) of an abrasive (pumice) and water was polished with a slurry while being fixed to a belt conveyor by a holding portion and conveyed. The liquid was supplied to the surface and a rotating roller-like polishing brush was pressed to remove the image recording layer and the ink. The portion where the roller-like polishing brush was pressed was supported by a backing plate from the back side of the belt conveyor.
The average particle size of the abrasive was 40 μm, and the maximum particle size was 100 μm. The material of the polishing brush was 6 · 10 nylon, the hair length was 50 mm, and the hair diameter was 0.3 mm. The polishing brush was planted so as to be dense by making a hole in a stainless steel tube having a diameter of 300 mm. Three polishing brushes were used. The polishing brush was pressed until the load of the drive motor for rotating the polishing brush became 7 kW plus with respect to the load before the polishing brush was pressed against the aluminum plate. The rotating direction of the polishing brush was the same as the moving direction of the aluminum plate. The rotation speed of the polishing brush was 200 rpm.
The lithographic printing plate after removing the ink and the image recording layer was put into a melting furnace in the same manner as in Example 1 and melted at 750 ° C. The recovery and purity were confirmed in the same manner as in Example 1.
（比較例３：アルカリ液によるインクの除去）
実施例１で用いた印刷済みの平版印刷版を準備し、アルカリ溶液（濃度１０質量％の水酸化ナトリウム水溶液）の液温３０℃として、アルカリ溶液中に１０分間浸漬した。その後、除去した画像記録層および付着物のカスの除去を目的として、表面に、水洗水をスプレー等により吹きかけつつ、ナイロンブラシでこすって画像記録層を除去した。
インクと画像記録層除去後の平版印刷版を実施例１と同様に溶解炉に投入して、７５０℃で溶解し、実施例１と同様に、回収率と純度を確認した。
前記比較例１〜３の結果を表１に併記した。
表１に明らかなように、熱や研磨材で画像記録層やインクを除去した比較例１、２によるアルミニウム再生地金では、実施例１に比べ、収率、純度ともに低いことがわかる。また、アルカリ水溶液によりインクなどを除去した比較例３によるアルミニウム再生地金では、純度は本発明と同様であったが、回収率が極めて低いことがわかる。
(Comparative Example 3: Removal of ink by alkaline liquid)
The printed lithographic printing plate used in Example 1 was prepared, and immersed in an alkaline solution for 10 minutes at a liquid temperature of 30 ° C. of an alkaline solution (sodium hydroxide aqueous solution having a concentration of 10% by mass). Thereafter, for the purpose of removing the removed image recording layer and adhering residue, the image recording layer was removed by rubbing with a nylon brush while spraying washing water on the surface with a spray or the like.
The lithographic printing plate after removing the ink and the image recording layer was put into a melting furnace in the same manner as in Example 1 and melted at 750 ° C. The recovery and purity were confirmed in the same manner as in Example 1.
The results of Comparative Examples 1 to 3 are also shown in Table 1.
As is apparent from Table 1, the aluminum recycled ingots according to Comparative Examples 1 and 2 in which the image recording layer and the ink were removed with heat or an abrasive were found to be lower in yield and purity than in Example 1. Moreover, in the aluminum reproduction | regeneration metal bar by the comparative example 3 which removed the ink etc. with alkaline aqueous solution, although purity was the same as that of this invention, it turns out that a recovery rate is very low.
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