FLAT PRINTED OR OFFSET LITHOGRAPHY

Offset Printing or Offset Lithography is a printing technique using a flat plate as a reference print. Lithography literally means "writing on stone" (stone writing). Offset printing is a printing technique of the most popular among the general public and used for printing such as printing flyers, pamplet, posters, books, magazines, newspapers, booklets, annual report, and various other prints. Offset printing process invented by Bavarian author German, Senefelder Alloys in 1798. Litho stones used as a reference print (plate) until 100-125 years later.

Based on the way income paper, offset printing machines can be divided into two parts:
Print 1.Mesin Gazette (Sheetfed)
Printing machine which uses a sheet of paper.
Print 2.mesin roll (web fed)
Namely the printing press that uses rolls of paper or rolls.
Work 1.Prinsip Sheetfed printing process (sheets)
The principle of offset printing is to repel the water and ink so as to form images or pictures on the surface of printed materials or paper. Offset printing using the material flat aluminum plates, so that the position of the print (image) and not print (non-image) the same height. Image section is sensitive to the ink (Oleophylic) when printed will attract ink, and non-image parts are sensitive to water (Hydropylic).

Judging from the construction machine, Sheetfed offset printing consisted of, among others:
# 1 Offset Printing Machines color printing unit consists of one sinder plate, blanket cylinder and the cylinder press. The ability to print hard copies is 1 / 0 (dipercetakan term which means to print one color or printed in advance of and behind the empty mold), so if you want to print a color separation (CMYK) must be printed 4 times and of course take a long time. In general, a color machine used to do a simple printed material, such as letterhead, envelopes, business cards, and others.

# Offset Printing Machine 2 color, 1 unit of construction consists of 2 cylindrical plate, blanket cylinder 2, and 2 cylinder press. The ability to print hard copies is 2 / 0 (dipercetakan term which means to print two colors or printed in advance of and behind the empty mold) so that when printing color separation (CMYK) will be printed twice. Print Cyan and Magenta color first and then the color Yellow and Black.

# Offset Printing Machine 4 color, 1 unit of construction consists of 4 cylindrical plate, blanket cylinder 4, and 4 cylinder press. The ability to print hard copies is 4 / 0 (dipercetakan term which means to print four-color printing in advance or above and behind the empty mold) so that when printing color separation (CMYK) can be done in a single track and faster time course.

# 6 Offset Printing Machines color, construction consists of 1 unit of 6 cylinder plate, blanket cylinder 6, and 6-cylinder press. The ability to print hard copies is 6 / 0 (dipercetakan term which means to print six colors or printed in advance of and behind the empty mold) that can print color separation (CMYK) and 2 or pantone spot colors in a single track and of course time is very fast.

Web-fed 2.Cetak (printed coils)
Web Offset printing is offset printing technique that uses a paper roll or rolls in the printing process. Usually used to print newspapers, magazines or books with thin paper, including printing "Book of God" or biblical.
Judging from the construction, printing machines webfed consists of:

a.Sistem blanket to blanket
- 2 cylinder plate
- 2 cylinder blanket
- Blanket except as a medium
It also functions as an intermediary cylinder press. Results print 1 / 1

b.Sistem satellite
- 4 cylinder plate
- 4 cylinder blanket
- 1 cylinder press
The result 2 / 0, 4 / 0, for color printing better results, especially the register printing.
Excess web offset printing machines
High speed and can print direct result truncated. Can print all the colors on both sides of the paper, it is certainly influenced by the amount and printing units are available.
Lack of web offset printing machines
High-speed web machines (40,000 and 60,000 prints per hour) so to control registers, color stability is not as good as sheet offset machine. Also in terms of supply ink to the paper, the maximum density of only 0.8 - 0.9 D, lower than Sheetfed offset. The quality is also somewhat grepes dot, not as sharp as a dot in Sheetfed printing.


Tips and Trick:
If you one day have the same digital data, but printed with offset printing Sheetfed (eg commercial advertisements in magazines) and print the web (eg advertising in newspapers), do not be surprised if the paper is not the same color paper with printed color in a magazine. Paper printouts of the paper tend to be more bleak. That's normal and ordinary. But you still can optimize print quality with attention to "signs" in the precast and print. Take advantage of Digital Color Proofing Technology that can simulate the results of your print properly.