Analysis and introduction of the solution of the h

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Analysis and introduction of solutions for double-sided printing

release date: Source: China paper

from the perspective of the mainstream solutions for double-sided printing in the printing industry around the world, rotary printing is the main means. The equipment strategy of Donnelly company, an internationally famous publication printing group, clearly takes rotary printing equipment as the company's equipment strategy. There are many relevant schemes in the packaging and printing industry. Today, China paper industry will take you to learn more about the relevant contents

the solution of sheet fed double-sided printing used to be only a supplement, but from the international trend in the past five years, sheet fed double-sided printing has been paid more and more attention by publishing and printing enterprises. Major printing equipment manufacturing groups also pay more and more attention to the development of sheet fed double-sided printing technology

the reason is that the requirements of publishing and printing are higher and higher, and the specifications of books, periodicals and magazines are also more and more complex. The limitation of rotary printing equipment is that it is uneconomical to print multiple specifications and short editions. Donnelly's company in China has also started to use sheet fed printing equipment in recent years to enhance its market competitiveness and order receiving ability

next, let's introduce the classification of double-sided printing equipment selection:

rotary double-sided printing solution

rotary double-sided printing solution is mainly divided into (1) newspaper rotary equipment; (2) Commercial rotating equipment

among them, the main requirements of the market for newspaper rotation equipment (blanket to blanket double-sided printing) are:

speed 30000 prints/hour; GSM uncoated paper; The highest point is 150 lines/in; Short ink path or splash ink supply

the main requirements of the market for commercial rotating equipment are:

speed 20000 prints/hour; GSM coated paper and uncoated paper; 175 lines/in at the highest point; Uniform ink supply, with dry drying channel

it should be noted that rotary printing is basically in the form of [blank to blank]] (B2B). Newspaper industry rotation mainly pursues high printing speed and high production efficiency. The commercial rotation has higher requirements on printing accuracy control, ink color control and drying than the newspaper rotation. The biggest difference between the two lies in the design of ink Road, speed and requirements of drying system

solutions for sheet fed double-sided printing equipment

after market analysis in recent years, we found that Japanese printing machinery manufacturers pay more attention to the practice and development of technology in sheet fed double-sided lithography than Europe and the United States. There is a sentence to describe this phenomenon very appropriately: "the United States is a rotation doctrine, and Europe is a one-sided polychromism."

Europe and the United States have some timid methods for sheet fed double-sided lithography. The main reason is that the efficiency of double-sided printing is lower than that of rotation, and the control is more complex than that of single-sided printing. However, the outstanding comprehensive efficiency and professional ability of double-sided printing make it more and more valued in the current market

according to the technology, there are four kinds of sheet fed double-sided printing equipment

(I) double sided alternating printing equipment (mainly Akiyama and Komori)

adopt 3-roll positive and negative alternating printing

the key technology is to solve the problem of non ink sticking and printing resistance of the embossing cylinder

the advantage is that the ink transfer volume reaches the same level as that of the single-sided printing machine

there are requirements for paper quality, and globalization is realized through mergers and acquisitions. It is suitable for paper with small deformation. Double sided printing

Komori adopts the solution of 9 double diameter rollers, It reduces the number of paper handover (11 times), but also greatly improves the requirements of manufacturing accuracy, adjustment and operation, and the printing effect (result) is often unsatisfactory

Akiyama adopts the arrangement of 18 equal diameter rollers, and the number of handover in the printing process reaches 20, but the printing results are easy to control. From the comparison and reflection of Japanese printing manufacturers, it is agreed that Akiyama scheme has advantages over Komori. At present, Komori is also turning to Hyderabad's turnover mechanism as the main scheme for double-sided offset printing

(II) intelligent horizontal printing belt overturning double-sided printing equipment that comprehensively improves enterprise R & D, production, management and service

uses overturning roller to bite on both sides and hand over reverse printing

the equipment is multi-purpose, and can carry out single-sided multi-color or double-sided printing

the key technology solves the problems of non inking and printing resistance of the embossing roller

on paper and cutting, There are operation requirements for front and back overprinting

the initial solution of using turnover roller is on two-color machine and four-color machine. Its advantage is that it can be used as single-sided multi-color or double-sided printing

however, now more and more 8-color ribbon flipping devices are manufactured. In fact, their flexibility is no longer the focus, and they have become a professional double-sided 4-color printing solution to improve their own advantages

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