Comparison of offset printing of rolls and sheets

تفاوت چاپ رول و چاپ افست چیستComparison of offset printing of rolls and sheets

Introduction

Many consider the invention of the printing press to be the most important invention of mankind throughout history.

Throughout history, the printing industry has played an invaluable role in recording, storing, and distributing information throughout the universe Since the invention of the printing press in the 15th century, many advances have been made in the printing industry

Currently, the most common printing technology in the world for printing more than a thousand copies is offset printing technology

This technology consists of two stages: lithography and printing

In the lithographic stage: what is to be printed is transferred to a metal plate called zinc

In printing stage: Zinc is placed on the rotating cylinders and the desired design is printed on paper by means of a rubber cylinder

Offset printing is of two types: sheet printing and roll printing

The main difference between the two technologies is the type of input paper to the printing press

In Sheet-fed technology, which is known as sheet printing in the Iranian market, paper is imported into the machine in the form of separate sheets

In Web-fed technology, which is known as roll printing in the Iranian market, paper enters the printing machine in the form of continuous rolls

But the difference between the two technologies is not only in the type of input paper to the printing press

The two technologies differ significantly in terms of print speed, cost-effectiveness, paper thickness, and machine output format

Some of the differences between the two technologies are as follow:

In roll printing, the printing speed is very high.
The roll printing machine can produce 60,000 copies of the output form in one hour.
In sheet printing, the maximum print speed is 10,000 copies per hour.
Roll printing The printing machine performs the folding operation simultaneously with the printing process.
In roll printing, the printing surface is printed back and forth simultaneously.
On most sheet-printed machines, the back and top of the printed form are printed separately.