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    • 1. 发明授权
    • Computer-to-cylinder type lithographic printing method and computer-to-cylinder type lithographic printing apparatus
    • 计算机对圆柱型平版印刷方法和计算机对圆柱型平版印刷设备
    • US06470799B2
    • 2002-10-29
    • US09818529
    • 2001-03-28
    • Yusuke NakazawaHideyuki KoguchiKazuo IshiiEiichi Kato
    • Yusuke NakazawaHideyuki KoguchiKazuo IshiiEiichi Kato
    • B41C110
    • B41J2/06B41C1/1066B41J2002/012B41J2002/061
    • A method of computer-to-cylinder lithographic printing, comprising: loading a plate material on a rotative plate cylinder of a lithographic printing apparatus; rotating the plate cylinder having loaded thereon the plate material; forming an image directly onto the plate material by an inkjet image-recording process which comprises ejecting an oil-based ink from a recording head having a plurality of ejecting channels, based on image data signals, utilizing an electrostatic field, to prepare a printing plate; subsequently performing lithographic printing with the thus prepared printing plate, wherein the recording head is driven so that every n'th channel thereof is actuated in a common phase, and wherein the plate cylinder is rotated to give a surface rotational speed V (mm/sec) of the plate material as represented by the following formula: V=25.4×(f×n)/N wherein N represents a recording resolution (dots/25.4 mm) along a rotative direction of the plate cylinder on the plate material, and f represents a driving frequency f (Hz) of each ejecting channel of the recording head.
    • 一种计算机对滚筒平版印刷的方法,包括:将平板印刷材料装载在平版印刷装置的旋转印版滚筒上; 旋转其上装有板材的印版滚筒; 通过喷墨图像记录方法将图像直接形成在板材上,其包括基于图像数据信号,利用静电场从具有多个喷射通道的记录头喷射油性油墨,以制备印刷板 ; 随后用如此制备的印版执行平版印刷,其中记录头被驱动,使得其第n个通道在公共相中被致动,并且其中印版滚筒旋转以提供表面旋转速度V(mm / sec )如下式所示:其中N表示沿着板材上的印版滚筒的旋转方向的记录分辨率(点/ 25.4mm),f表示每个喷射的印刷滚筒的驱动频率f(Hz) 通道的记录头。
    • 7. 发明授权
    • Method for preparation of printing plate by electrophotographic process
    • 通过电子照相法制备印版的方法
    • US5700612A
    • 1997-12-23
    • US661723
    • 1996-06-11
    • Eiichi KatoYusuke NakazawaKazuo Ishii
    • Eiichi KatoYusuke NakazawaKazuo Ishii
    • G03G13/26G03G13/28
    • G03G13/26G03G13/283
    • A method for preparation of a printing plate by an electrophotographic process comprising providing a peelable transfer layer (T) containing a resin (A) capable of being removed upon a chemical reaction treatment on an electrophotographic light-sensitive element, forming a toner image on the transfer layer by an electrophotographic process, providing an adhesive layer (M) containing a thermoplastic resin (B) only on the toner image, transferring the toner image together with the transfer layer (T) and the adhesive layer (M) from the electrophotographic light-sensitive element to a primary receptor, transferring the toner image together with the transfer layer (T) and the adhesive layer (M) from the primary receptor to a receiving material having a surface capable of providing a hydrophilic surface suitable for lithographic printing at the time of printing, and then removing the transfer layer (T) in the non-image portion on the receiving material by the chemical reaction treatment. According to the method of the present invention, printing plates which produce prints of good image qualities having a lage proportion of image areas can be continuously obtained in a stable manner for a long period of time even when a thickness of the transfer layer is reduced or the transfer is conducted under conditions of low temperature, low pressure and high speed irrespective of the kind of toner employed.
    • 一种通过电子照相方法制备印版的方法,包括提供含有可在电子照相感光元件进行化学反应处理时能除去的树脂(A)的可剥离转印层(T),在 通过电子照相方法转印层,仅在调色剂图像上提供含有热塑性树脂(B)的粘合剂层(M),将调色剂图像与转印层(T)和粘合剂层(M)一起从电子照相光转印 将调色剂图像与转印层(T)和粘合剂层(M)一起从初级接收体转移到具有能够提供适合于平版印刷的亲水表面的表面的接收材料 打印时间,然后通过化学反应处理去除接收材料上的非图像部分中的转印层(T)。 根据本发明的方法,即使当转印层的厚度减小时,也可以长期稳定地连续地获得具有图像面积比例大的具有良好图像质量的印刷品的印刷版, 转移在低温,低压和高速的条件下进行,而与使用的调色剂的种类无关。
    • 10. 发明授权
    • Method for preparation of printing plate by electrophotographic process
using liquid developer
    • 使用液体显影剂通过电子照相法制备印版的方法
    • US5882828A
    • 1999-03-16
    • US816654
    • 1997-03-13
    • Eiichi KatoYusuke Nakazawa
    • Eiichi KatoYusuke Nakazawa
    • G03G13/16G03G13/28G03G13/10
    • G03G13/283G03G13/16
    • A method for preparation of a printing plate by an electrophotographic process comprising, in order, a) forming a toner image on an electrophotographic light-sensitive element having a release surface by an electrophotographic process using a liquid developer comprising a dispersion medium having dispersed therein toner grains each containing at least one resin (A) having a glass transition point of from 20.degree. C. to 80.degree. C. or a softening point of from 35.degree. C. to 100.degree. C. and at least one resin (B) having a glass transition point or a softening point at least 2.degree. C. lower than that of the resin (A), b) drying the toner image to remove the dispersion medium thereby causing at least partial adhesion between the toner grains, c) bringing the toner image into contact with an intermediate transfer medium having a surface adhesion force of not less than 3 gram.multidot.force at temperature (T.sub.1) and not more than 40 gram.multidot.force at temperature (T.sub.2), at the temperature (T.sub.1) to transfer the toner image onto the intermediate transfer medium, and d) bringing the toner image into contact with a final receiving material having a surface capable of providing a hydrophilic surface suitable for lithographic printing at the time of printing at the temperature (T.sub.2) higher than the temperature (T.sub.1 to transfer the toner image onto the final receiving material. According to the method of the present invention, the toner image formed from a liquid developer is transferred with good efficiency onto the final receiving material through the intermediate transfer medium, and the printing plate obtained provides a large number of prints having highly accurate images free from background stain. An apparatus suitable for conducting the method is also disclosed.
    • 一种通过电子照相方法制备印版的方法,其包括以下步骤:a)通过电子照相方法在具有剥离表面的电子照相感光元件上形成调色剂图像,所述液体显影剂包括分散介质,分散介质中分散有调色剂 每个含有至少一种玻璃化转变点为20℃至80℃或软化点为35℃至100℃的树脂(A)的颗粒和至少一种树脂(B),其具有 玻璃化转变点或软化点比树脂(A)低至少2℃,b)干燥调色剂图像以除去分散介质,从而导致调色剂颗粒之间的至少部分粘合,c)使 调色剂图像在温度(T1)下具有不小于3克力的表面粘附力和在温度(T2)下不超过40克力的中间转印介质在温度(T1)下接触以转印调色剂 图像到中间转印介质上,以及d)使得调色剂图像与最终的接收材料接触,该最终接收材料具有能够在高于温度(T2)的温度(T2)下印刷时适于平版印刷的亲水表面的表面, T1将调色剂图像转印到最终的接收材料上。 根据本发明的方法,由液体显影剂形成的调色剂图像通过中间转印介质以良好的效率转印到最终的接受材料上,并且所获得的印刷版提供大量的具有高精度图像的印刷品 背景污点。 还公开了适用于进行该方法的装置。