公开(公告)号：US20050235854A1

公开(公告)日：2005-10-27

申请号：US11114210

申请日：2005-04-21

申请人： Joan Vermeersch ,  Wim Sap ,  Marc Damme

发明人： Joan Vermeersch ,  Wim Sap ,  Marc Damme

IPC分类号： B41C1/10

CPC分类号： B41C1/1008 ,  B41C2210/02 ,  B41C2210/06 ,  B41C2210/22 ,  B41C2210/24 ,  B41C2210/262

摘要： A method is disclosed for accurate reproduction of high-quality halftone images comprising microdots by means of lithographic plate materials which comprise a heat-sensitive positive-working coating that requires wet processing. Such microdots have a dot size ≦25 μm and may be obtained by stochastic screening or by amplitude-modulated screening at a ruling of not less than 150 lpi. It has been established that the “physical right exposure energy density” (physical REED) lies in the range from CP to 1.5*CP, wherein the physical REED is defined as the energy density at which the physical area on the plate, occupied by a microdot corresponding to a 50% halftone in the image data, coincides with the 50% target value; and wherein CP is the clearing point of the plate which is defined as the minimum energy density that is required to obtain, after processing, a dissolution of 95% of the coating. An accurate reproduction of microdots can therefore be achieved by exposing the material with light having an energy density in the range from CP to 1.5*CP. Loss of microdots by overexposure is thereby avoided.

摘要翻译： 公开了一种用于通过平版印刷材料精确再现包含微点的高质量半色调图像的方法，该平版印刷材料包括需要湿法处理的热敏正性涂层。 这样的微点具有<25μm的点大小，并且可以通过随机筛选或通过幅度调制筛选获得，尺寸不小于150lpi。 已经确定的是，“身体右曝光能量密度”（物理REED）在CP到1.5 * CP的范围内，其中物理REED被定义为板上物理区域由能量密度 在图像数据中对应于50％半色调的微点符合50％的目标值; 并且其中CP是板的清除点，其被定义为在加工后95％的涂层的溶解所需的最小能量密度。 因此，通过用能量密度在CP至1.5×CP范围内的光使材料曝光，可以实现微点的精确再现。 从而避免由于过度曝光导致的微点损失。

公开(公告)号：US20060019191A1

公开(公告)日：2006-01-26

申请号：US10531629

申请日：2003-09-25

申请人： Johan Loccufier ,  Bert Groenendaal ,  Huub Aert ,  Marc Damme

发明人： Johan Loccufier ,  Bert Groenendaal ,  Huub Aert ,  Marc Damme

IPC分类号： G03C1/494

CPC分类号： B41C1/1008 ,  B41C2210/02 ,  B41C2210/04 ,  B41C2210/06 ,  B41C2210/22 ,  B41C2210/24 ,  B41C2210/262 ,  C08G8/28 ,  C08L61/14

摘要： A polymer for a heat-sensitive lithographic printing plate precursor is disclosed wherein the polymer comprises a phenolic monomeric unit of which the phenyl group is substituted by a group A characterised in that the group A comprises an inside or thioimide group and wherein the modification of the polymer increases the chemical resistance of the coating of the printing plate precursor.

摘要翻译： 公开了一种用于热敏平版印刷版原版的聚合物，其中所述聚合物包含苯基被基团A取代的酚单体单元，其特征在于基团A包含内部或硫代酰亚胺基团，并且其中 聚合物增加了印版前体的涂层的耐化学性。

公开(公告)号：US20070032564A1

公开(公告)日：2007-02-08

申请号：US10573193

申请日：2004-09-01

申请人： Paul Callant ,  Marc Damme

发明人： Paul Callant ,  Marc Damme

IPC分类号： B29C71/04

CPC分类号： G03F7/031 ,  C08F2/50

摘要： A composition that is photopolymerizable upon absorption of light in the wavelength range from 300 to 450 nm, the composition comprising a binder, a polymerizable compound, a sensitizer and a photoinitiator, characterized in that the sensitizer is an optical brightening agent having a solubility in methyl ethyl ketone of at least 15 g/kg measured at 20° C., allows to produce printing plates without pinhole defects, even if the printing plate precursor is stored before exposure and processing.

摘要翻译： 在300〜450nm的波长范围内吸收光后可光聚合的组合物，所述组合物包含粘合剂，可聚合化合物，敏化剂和光引发剂，其特征在于，所述敏化剂是在甲基中具有溶解度的荧光增白剂 在20℃下测量的至少15g / kg的乙基酮，即使在曝光和加工之前储存印版前体，也可以生产没有针孔缺陷的印版。

公开(公告)号：US20070077513A1

公开(公告)日：2007-04-05

申请号：US10583542

申请日：2004-12-08

申请人： Paola Campestrini ,  Joan Vermeersch ,  Marc Damme

发明人： Paola Campestrini ,  Joan Vermeersch ,  Marc Damme

IPC分类号： G03C1/00

CPC分类号： B41C1/1008 ,  B41C2210/02 ,  B41C2210/06 ,  B41C2210/22 ,  B41C2210/24 ,  B41C2210/262 ,  B41N1/083 ,  B41N3/00 ,  B41N3/034 ,  B41N3/038

摘要： A positive-working lithographic printing plate precursor is disclosed which comprises (i) a grained and anodized aluminum support having a hydrophilic surface and (ii) a heat-sensitive oleophilic coating provided on the hydrophilic surface, wherein said coating comprises (a) a hydrophobic polymer which is soluble in an aqueous alkaline developer and (b) a dissolution inhibitor which is a water-repellent polymer and wherein said coating is capable of dissolving in said developer at a higher dissolution rate in areas of said coating which are exposed to heat or infrared light than in unexposed areas, characterized in that the hydrophilic surface has a surface roughness, measured according to ISO 4288 and expressed as arithmetical mean center-line roughness Ra′, which is less than 0.40 μm and the hydrophilic surface comprises a salt of titanium, hafnium or zirconium. A hydrophilic surface, which has a low surface roughness and contains a salt of titanium, hafnium or zirconium, is used to obtain an improved sensitivity of the coating with a reduced staining and an increased printing run length.

摘要翻译： 公开了一种正性平版印刷版前体，其包括（i）具有亲水表面的颗粒和阳极氧化铝载体和（ii）在亲水表面上提供的热敏亲油涂层，其中所述涂层包含（a）疏水性 可溶于碱性显影液的聚合物和（b）作为拒水聚合物的溶解抑制剂，其中所述涂层能够以较高的溶解速率溶解在所述显影剂中，所述涂层暴露于热或 其特征在于亲水表面具有根据ISO 4288测量的表面粗糙度，并表示为小于0.40μm的算术平均中心线粗糙度Ra'，并且亲水表面包含钛的盐 ，铪或锆。 使用具有低表面粗糙度并含有钛，铪或锆的盐的亲水性表面，以减少染色和增加的印刷行程长度来获得涂层的改善的敏感性。