Printing technology of lithographic plate

Printing basic principle of the lithographic plate

Lithographic plate it is named as the developing of print by early stone plate , early stone plate print the material use stone application after rubing flat, it is a edition of material to improve for metal photo zincography or the aluminium edition , but its principle did not change . Every print part and is it have difference of level partly to print, i.e. the level , utilize water oil mix principle is it print part of the line keep a layer of oil films rich in oil to make, but not printing the layout on the part of line can absorb the proper moisture , imagine after the printing ink in the layout , have printed the part of the line and repelled the moisture and absorbed the printing ink , but not print the part of the line and absorb the moisture and form and resist black function , the method of utilizing this kind of method to print, is called " the lithographic plate is printed ".

Printing way of the lithographic plate

The Lithographic plate print way is it developed by early stone plate way , and describe and become against the line in transfering to and writing with paper dropping on one more edition of , then it is the straight line to print on the paper. Because of the method pressure born while printing, it makes the lithographic plate (print line part with print line part level ) of surface plate actually, after bearing the pressure , the diffusion for it of printing ink that takes in the layout expand , and produced the bad phenomenon of picture line , so improved and called later 〖Ke type prints the law 〗 (offset Printing), their print way to make layout straight line , is it prints to be against the line on the rubber tube to transfer to when printing, being and then printed to the paper against the line is a straight line , can improve and print the elasticity of the pressure in this way.

The early lithographic plate is printed for the flat pressing type of the lithographic plate, to developing into pressing type two kinds the round pressing type of the lithographic plate and round edition of rounds later, round pressing type computer uses the lithographic plate in printing specially, for instance working out a draft machine that the proof uses ,etc., print machine of paper ,etc. improve round editions of round pigeonholing type all. Printing layouts to keep flat in i.e. the round pressing type of the lithographic plate, the pressure part is the cylinder pressing tube, this kind of printing way is very similar to the lithographic plate round in letterpress and press the machine the samly. Will print one edition of parcels and call a edition of tube on the cylinder in pressing type of round edition of rounds, machine another cylinder parcel have to call rubber tube rubber, pressure part with pressing tube cylinder, this kind call that " Ke type printing machine " with three basic machine that cylinder construct.

Range of application of lithographic plate printing

① Poster , ②brief introduction , ③manual , ④newspaper, ⑤packaging, ⑥books, ⑦magazine, ⑧calendar, ⑨other printed matters about colored printing and large quantity .

Composition of the department that prints printing machine of lithographic plate

1- Paper 2- Water roller 3- Black roller 4- Blank part 5- Part of the pictureand text

6- water fight P- printing plate cylinder B- rubber cylinder I- impress the cylinder