Dampening water composition for lithographic printing and additive for
dampening water
    1.
    发明授权
    Dampening water composition for lithographic printing and additive for dampening water 失效
    用于平版印刷和补充水的防水组合物

    公开(公告)号:US5106414A

    公开(公告)日:1992-04-21

    申请号:US332728

    申请日:1989-04-04

    IPC分类号: B41N3/08

    CPC分类号: B41N3/08

    摘要: A dampening water composition for lithographic printing which comprises 0.1 to 5% by weight of at least one member selected from the group consisting of monoalcohols or diols of alkanes or alkenes having 5 to 11 carbon atoms, to which 1 to 10 moles of ethylene oxide and/or propylene oxide are added. The dampening water composition is not toxic, has not a possiblity of causing a fire and pollution of working atmosphere and, therefore, the use of a local exhaust installation is not necessary. Moreover, it is excellent in characteristics as dampening water such that it does not cause contamination of metering roll, has good bleeding properties, emulsifying properties and stability in continuous processing as well as low foaming properties. Thus, the composition makes printing operation quite stable.

    Dampening water composition for lithographic plate
    4.
    发明授权
    Dampening water composition for lithographic plate 失效
    刨光板的防水组合物

    公开(公告)号:US5064749A

    公开(公告)日:1991-11-12

    申请号:US559352

    申请日:1990-07-30

    IPC分类号: B41N3/08

    CPC分类号: B41N3/08

    摘要: The present invention relates to a concentrated dampening water for a lithographic printing plate characterized by comprising:(a) 0.5 to 50% by weight of, as a nonionic surfactant, at least one compound selected from the group consisting of ethylene oxide and/or propylene oxide adduct of 2-ethyl-1,3-hexanediol and ethylene oxide and/or propylene oxide adduct of acetylene alcohol or acetylene glycol,(b) 1 to 30% by weight of 4-hydroxy-4-methyl-2-pentanone and/or a compound of the following formula [I], [III] or [III]: ##STR1## wherein R represents a methyl group, an ethyl group, a propyl group or a butyl group, and(c) 30 to 75% by weight of water.According to the present invention, an excellent concentrated dampening water is obtained, which has substantially no toxicity: does not pollute the working environment and causes no fire; necessitates no local exhaust device; and is excellent from the viewpoints of fouling of the metering roll, bleeding, emulsifiability, stability for continuous operation and anti-foaming property. Thus, with the concentrated dampening water of the present invention, the stable printing is possible.

    Method for manufacturing lithographic printing plates
    5.
    发明授权
    Method for manufacturing lithographic printing plates 失效
    平版印刷版的制造方法

    公开(公告)号:US5002857A

    公开(公告)日:1991-03-26

    申请号:US365728

    申请日:1989-06-14

    IPC分类号: G03F7/40 G03F7/30 G03F7/32

    CPC分类号: G03F7/30

    摘要: A method for manufacturing lithographic printing plates which comprises developing a presensitized plate for use in making lithographic printing plates imagewise opposed to light with an alkaline developer utilizing an automatic developing machine and then treating the developed presensitized plate with a finisher, wherein an initial pH of the finisher ranges from 2 to 8 and a pH of the finisher is controlled during running in proportion to concentration of the developer included in the finisher. The method makes it possible to prevent the formation of gel-like insoluble matters in the bath for treatment with the finisher due to the presence of the developer carried over from a developing bath and to stably process a large amount of lithographic printing plates over a long time period.

    Photo-sensitive printing plate processing apparatus
    6.
    发明授权
    Photo-sensitive printing plate processing apparatus 失效
    光敏印刷机加工设备

    公开(公告)号:US5138353A

    公开(公告)日:1992-08-11

    申请号:US367414

    申请日:1989-06-16

    IPC分类号: G03F7/30

    CPC分类号: G03F7/3042

    摘要: A photo-sensitive printing plate processing apparatus for processing a photo-sensitive printing plate upon which an image has been exposed is provided wherein, adjacent to a main developing tank where the photo-sensitive printing plate is conveyed, immersed in developing solution and developed, on either the upstream or downstream side with respect to the direction of conveyance of the photo-sensitive printing plate, an auxiliary developing tank is provided for applying developing solution to the photo-sensitive printing plate and performing auxiliary developing thereof and therefore allowing definite developing of the photo-sensitive printing plate to be achieved.

    Concentrated dampening water composition for lithographic printing
    8.
    发明授权
    Concentrated dampening water composition for lithographic printing 失效
    用于平版印刷的浓缩防水组合物

    公开(公告)号:US5221330A

    公开(公告)日:1993-06-22

    申请号:US889391

    申请日:1992-05-28

    IPC分类号: B41N3/08

    CPC分类号: B41N3/08

    摘要: A concentrated dampening water composition for lithographic printing comprises a) 0.1 to 10% by weight of a hydrophilic polymeric compound having a film-forming ability; b) 0.01 to 15%, by weight of a pH buffering agent; c) 5 to 80% by weight of a water-miscible organic solvent having a boiling point of not less than 140.degree. C. and whose 1% by weight aqueous solution has a surface tension of not more than 60 dynes/cm; d), 0.05 to 10% by weight of a compound, for instance, represented by the following general formula (III); and e) 30 to 80% by weight of water:R.sup.8 --Z.sup.1 (R.sup.9)(R.sup.10)--R.sup.7.X.sup.1 (III)wherein R.sup.7 to R.sup.10 each represents a C.sub.1-12 alkyl, cyclic alkyl, hydroxyalkyl, benzyl or substituted or unsubstituted phenyl group; Z.sup.1 represents N, P or B; X.sup.1 represents an anion or cation selected from the group consisting of halogen, nitrate, sulfate, phosphate, hydroxyl, PF.sub.6.sup.-, BF.sub.4.sup.-, Li.sup.+, Na.sup.+, K.sup.+ and NH.sub.4.sup.+. The composition shows good printing properties and does not impair image areas of printing plates although it comprises a high boiling point solvent. Further, it provides dampening water having excellent stability with time, satisfies the requirements stipulated in the Japanese Fire Services Act as well as Industrial Safety and Health Law and thus can steadily provide good copies.

    Method for supplementing replenisher for developer in automatic
developing machine for presensitized plate
    9.
    发明授权
    Method for supplementing replenisher for developer in automatic developing machine for presensitized plate 失效
    补充自动显影机的显影剂补充剂的方法

    公开(公告)号:US4882246A

    公开(公告)日:1989-11-21

    申请号:US218892

    申请日:1988-07-14

    摘要: A method for supplementing a replenisher for developer which comprises developing a large number of PS plates imagewise exposed to light with a developer composed of an aqueous solution containing electrolytes in an automatic developing machine, characterized by determining an AC impedance of the developer contained in the automatic developing machine, obtaining a correction impedance from the measured impedance value and rate of replacement and supplementing a desired amount of the replenisher to the developer when the correction impedance reaches a predetermined value. This method makes it possible to maintain a desired activity of the developer even when a large number of PS plates are processed and to relax the restriction on the incorporation of optional devices such as an autofeeder into the automatic developing machine.

    摘要翻译: 一种用于补充显影剂补充剂的方法,其特征在于,确定包含在自动显影机中的显影剂的AC阻抗,该显影剂用于在自动显影机中显影由包含电解质的水溶液组成的显影剂成像曝光的大量PS平板 显影机,当所述校正阻抗达到预定值时,根据所测量的阻抗值和替换速率获得校正阻抗,并将所需量的补充剂补充到显影剂。 这种方法使得即使在处理大量PS板时也能够保持显影剂的期望活性,并且可以放松将诸如自动进料器的可选装置结合到自动显影机中的限制。