CS231469B1 - Cleaning solution for aluminium offset plates with oxidized surface - Google Patents
Cleaning solution for aluminium offset plates with oxidized surface Download PDFInfo
- Publication number
- CS231469B1 CS231469B1 CS831042A CS104283A CS231469B1 CS 231469 B1 CS231469 B1 CS 231469B1 CS 831042 A CS831042 A CS 831042A CS 104283 A CS104283 A CS 104283A CS 231469 B1 CS231469 B1 CS 231469B1
- Authority
- CS
- Czechoslovakia
- Prior art keywords
- printing
- cleaning solution
- oxidized surface
- offset plates
- water
- Prior art date
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 8
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 8
- 238000004140 cleaning Methods 0.000 title claims abstract description 7
- 239000004411 aluminium Substances 0.000 title 1
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- -1 disodium ethylene amine tetraacetic acid Chemical compound 0.000 claims description 3
- 238000007639 printing Methods 0.000 abstract description 26
- 239000002966 varnish Substances 0.000 abstract description 8
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 abstract 1
- 239000000126 substance Substances 0.000 abstract 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000004922 lacquer Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000007645 offset printing Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Landscapes
- Printing Plates And Materials Therefor (AREA)
- Detergent Compositions (AREA)
Abstract
Čisticí roztok je určen k vyčištění tiskových míst na hliníkové tiskové.desce pro zvýšení adheze tiskového laku. Podstatu roztoku tvoří hydroxid sodný, - dvojsodná sůl kyseliny ethylendiamintetraoctové a voda.The cleaning solution is designed to clean the print places on aluminum printing plate for increasing the adhesion of the printing varnish. The substance of the solution is sodium hydroxide, - disodium salt of ethylenediaminetetraacetic acid and water.
Description
Vynález se týká čisticího roztoku pro hliníkové ofsetové desky s oxidovaným povrchem, určené pro pozitivní tiskový proces.BACKGROUND OF THE INVENTION The present invention relates to a cleaning solution for an oxidized surface aluminum offset plate for a positive printing process.
Tiskové desky slouží jako nosná podložka, na kterou se nanáší citlivá vrstva, citlivá vrstva se osvitne přes pozitivní předlohu, kterou chceme reprodukovat tiskem, a po osvitu se vyvolá. Tím se získá negativní šablona, která po zalakování slouží jako tisková forma.The printing plates serve as a support to which the sensitive layer is applied, the sensitive layer is illuminated over the positive original that we want to reproduce by printing, and is invoked after exposure. This produces a negative template which, after painting, serves as a printing form.
Při použití hliníkových velkoformátových desek pro tisk ofsetem se povrch desky upravuje elektrochemickým zdrsněním s následnou anodickou oxidací. Tímto postupem se na povrchu desky vytvoří vrstva kysličníku hlinitého s kapilární strukturou o tlouštce 1 až 2 <um. Optimální drsnost desky se pohybuje kolem 0,6 až 1 pm. Deska se potom ovrstvuje citlivým roztokem s negativním fotochemickým charakterem, osvituje přes požadovanou pozitivní předlohu a vyvolává. Vyvolání se provádí vodou. Na tiskových místech se neosvitnutá vrstva vodou odplaví. Na osvitnutých místech zůstane ochranrtá utvrzená citlivá vrstva. Tisková místd se ' potřou tiskovým lakem a invertují z negativu na pozitiv.When using aluminum large-format plates for offset printing, the surface of the plate is treated by electrochemical roughening followed by anodic oxidation. In this way, a layer of aluminum oxide having a capillary structure of 1 to 2 µm thickness is formed on the surface of the plate. The optimum board roughness is about 0.6 to 1 µm. The plate is then coated with a sensitive solution having a negative photochemical character, lighted over the desired positive pattern and developed. Development is carried out with water. At non-illuminated layers the water is washed away. A light-cured, cured sensitive layer remains in the illuminated areas. The printing points are rubbed with printing varnish and inverted from negative to positive.
Aby tiskový lak dobře přilnul k hliníkovému základu tiskové desky, musí být tisková místa před nanesením laku naprosto čistá. Tiskový lak přijímá při tisku tiskovou barvu. Zbylá utvrzená vrstva na místech netisknoucích se odstraní chemicky, vznikne tisková forma.In order for the printing varnish to adhere well to the aluminum base of the printing plate, the printing areas must be absolutely clean before applying the varnish. The printing varnish receives ink when printing. The remaining hardened layer in the non-printing areas is removed chemically, resulting in a printing form.
Dosud používané čisticí roztoky pro vyčištění tiskových míst před nanesením tiskového laku nejsou dostatečně spolehlivé. Projevuje se to sníženou přilnavostí tiskového laku k hliníkové podložce a následnou nízkou výdržností tiskové formy během tisku. Praxe tomu čelí dodatečným potíráním tiskové formy roztokem bezvodého lihu denaturovaného benzínem, což je neekonomické.The cleaning solutions used hitherto to clean the printing areas before applying the printing varnish are not sufficiently reliable. This is reflected in the reduced adhesion of the printing varnish to the aluminum substrate and the consequent low durability of the printing mold during printing. Practice has faced this by additionally rubbing the printing form with a solution of anhydrous alcohol denatured by gasoline, which is uneconomical.
Uvedené nedostatky odstraňuje čisticí roztok podle vynálezu, jehož podstata spočívá v tom, že sestává z 1 až 6 hmot. dílů hydroxidu sodného, 1 až 15 hmot. dílů dvojsodné soli kyseliny ethylendlamlntetraoctové a 500 až 1 000 hmot. dílů vody o pokojové teplotě.These drawbacks are overcome by the cleaning solution according to the invention, which consists of 1 to 6 wt. parts by weight of sodium hydroxide, 1 to 15 wt. parts by weight of disodium ethylene amine tetraacetic acid and 500 to 1000 wt. parts of room temperature water.
PříkladExample
Za stálého míchání se přidává do l litru vody 4 g hydroxidu sodného a po rozpuštění se přidá 12,5 g dvojsodné soli kyseliny ethylendlamlntetraoctové. Po rozpuštění všech složek se roztok přefiltruje a zředí vodoh v poměru 1:9.While stirring, 4 g of sodium hydroxide are added to 1 liter of water, and after dissolution, 12.5 g of disodium ethylene amine tetraacetic acid are added. After all components had dissolved, the solution was filtered and diluted with water 1: 9.
čisticí roztok podle vynálezu dokonale vyčistí hliníkovou desku v místech tisknoucích, na které má přilnout tiskový lak. Tiskový lak dokonale k podložce přilne a ve zvýšeném množství. Výdržnost tiskové formy se stabilizuje a podstatně zvýší. Odstraní se rovněž závojování kresby při tisku.The cleaning solution according to the invention perfectly cleans the aluminum plate at the printing points to which the printing lacquer is to adhere. The printing varnish adheres perfectly to the mat and in increased quantities. The durability of the printing form is stabilized and substantially increased. It also removes the veil of the artwork when printing.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS831042A CS231469B1 (en) | 1983-02-16 | 1983-02-16 | Cleaning solution for aluminium offset plates with oxidized surface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS831042A CS231469B1 (en) | 1983-02-16 | 1983-02-16 | Cleaning solution for aluminium offset plates with oxidized surface |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CS104283A1 CS104283A1 (en) | 1984-03-20 |
| CS231469B1 true CS231469B1 (en) | 1984-11-19 |
Family
ID=5343793
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CS831042A CS231469B1 (en) | 1983-02-16 | 1983-02-16 | Cleaning solution for aluminium offset plates with oxidized surface |
Country Status (1)
| Country | Link |
|---|---|
| CS (1) | CS231469B1 (en) |
-
1983
- 1983-02-16 CS CS831042A patent/CS231469B1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| CS104283A1 (en) | 1984-03-20 |
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