摘要:
A process is disclosed for the production of bases for offset printing plates in the form of sheets, foils or webs made of roughened aluminum or one of its alloys, which is carried out in an anodic oxidation stage, i.e. in an aqueous electrolyte which contains phosphorus-containing anions. In the procedure, an electrolyte containing dissolved phosphoroxo anions, with the exception of aqueous H.sub.3 PO.sub.4, is employed, and the treatment is carried out for a period of about 1 to 90 seconds, at a voltage between about 10 and 100 volts and at a temperature of about 10.degree. to 80.degree. C. The electrolyte is, in particular, a salt of an oxyacid of phosphorus, such as Na.sub.3 PO.sub.4 or K.sub.3 PO.sub.4. Hydrophilization of the base can be carried out additionally after the anodic oxidation. Also disclosed is a base material produced according to the process and an offset printing plate which includes the base material.
摘要翻译:公开了一种用于生产由粗糙铝或其合金之一制成的片材,箔或网的形式的胶版印刷版的方法,其在阳极氧化阶段即在含有磷的水性电解质中进行 含阴离子。 在该方法中,使用除了H 3 PO 4水溶液之外含有溶解的磷氧阴离子的电解质,并且处理在约1至90秒的时间内,在约10至100伏之间的电压和温度 约10℃至80℃。电解质特别是磷的含氧酸盐,例如Na 3 PO 4或K 3 PO 4。 在阳极氧化后,还可以进行碱的亲水化。 还公开了根据该方法生产的基材和包括基材的胶版印刷版。
摘要:
In the electrochemical roughening of aluminum or its alloys useful for printing plate supports, an aqueous mixed electrolyte solution is employed, which contains hydrochloric acid (HCl) and hydrofluoric acid (HF), in particular in an amount of from about 0.5 to 10% by weight of HCl and of from about 0.05 to 5% by weight of HF. The very uniformly roughened support materials are used in the production of offset printing plates.
摘要:
Disclosed is a process for the production of a material in the form of a plate, a foil or a strip, from aluminum or an alloy thereof, which has been chemically, mechanically and/or electrochemically roughened. The process comprises a two-stage oxidation involving a first stage (a) which is performed in an aqueous electrolyte having from about 60 to 180 g/l of phosphoric acid, at a temperature of the electrolyte bath of about 47.degree. to 70.degree. C. and at a voltage of about 36 to 80 V and a second stage (b) which is performed in an aqueous electrolyte having from about 60 to 300 g/l of sulfuric acid, at a temperature of the electrolyte bath of about 30.degree. to 65.degree. C. and at a voltage of about 15 to 35 V. Also disclosed is an offset-printing plate, having a radiation-sensitive coating and a support material produced by the process described above.
摘要:
The process for manufacturing support materials for offset-printing plates is carried out in two stages. These materials are in the form of plates, foils, or strips, composed of aluminum, or an alloy thereof, which have been roughened by chemical, mechanical and/or electrochemical treatment. These two stages comprise an anodic oxidation in (a) an aqueous electrolyte based on sulfuric acid, and in (b) an aqueous electrolyte with a content of anions which contain phosphorus. An electrolyte with a content, in solution, of phosphoroxo anions, phosphorofluoro anions, and/or phosphoroxofluoro anions is employed in stage (b), and the treatment is carried out at a voltage between about 10 and 100 V, at a temperature of from about 10.degree. to 80.degree. C., and for a duration of from abut 1 to 60 seconds. The electrolyte is, in particular, an oxygen acid of phosphorus, or a salt with the above-mentioned anions. Following stage (b), it is also possible to carry out an additional treatment to impart hydrophilic properties to the support material.
摘要:
A process for producing a support for planographic printing is described, which comprises electrochemically graining the surface of an aluminum plate with an electrolytic solution containing from 1,000 to 40,000 ppm of nitric acid, from 50 to 4,000 ppm of sulfuric acid group.
摘要:
A method for treating an aluminum sheet useful for lithography by etching said sheet in an aqueous bath containing up to about 25% of nitric and/or hydrochloric acids and from about 1% to about 25% of an inorganic fluorine containing acid or salt thereof. Said etching step is sequentially followed by electrochemical graining and anodizing process steps.
摘要:
There is disclosed a photosensitive lithographic printing plate material comprising a photosensitive layer having a slip sheet laid on the surface thereof, said slip sheet comprising natural pulp, 5 to 50% by weight of polyolefinic synthetic pulp and 0.2 to 2.0% by weight of an alkali metal halide.
摘要:
A retouching agent for lithographic printing plate containing an admixture of (a) a lactone having 4 to 6 carbon atoms and (b) a glycol ether or ketone.
摘要:
A method for the production of aluminum substrates useful in the production of lithographic printing plates which comprises simultaneously electrochemically graining both sides of an aluminum sheet in an electrolyte employing three phase alternating current.
摘要:
A method for the production of aluminum substrates useful in the production of lithographic printing plates which comprises mechanically graining the surface of an aluminum sheet, subsequently finely graining the mechanically grained sheet in a saturated solution of an aluminum salt of a mineral acid to which up to 10% of a mineral acid has been added, with discretional electrolysis, and then optionally anodizing the sheet.