Offset printer quality appraisal

offset printing machine is a lithographic printing machine. Its working principle is to transfer the graphics and text on the printing plate to paper or other materials through a rubber roller. The
offset printing machine uses rubber blanket-covered printing plates for printing, and is suitable for high-definition, high-quality, high-speed mass printing.
In the case of offset printing machine quality appraisal, Zhongke Testing can provide offset printing machine quality appraisal services.

can be divided into sheet-fed automatic flat offset printing presses and web high-speed web offset printing presses according to different printing conditions and basic printing methods;
can be divided into single-color machines, two-color machines, four-color machines, six-color machines and eight-color machines according to the number of printing colors;
According to different printing papers, TAGTOKEN2 can be divided into four-opening machines, folio-opening machines, full-sheet machines and double-full-sheet machines; according to the paper feeding method,
has single-fed paper (also called flat paper), roll paper, roll-fed single-fed paper, roll-type plastic film and roll-type thin metal offset printing machines.

GB/T 17861-1999 Office machinery Offset printing machine Installation characteristics of printing plate
JB/T 14058-2022 Curved letterpress offset printing machine
JB/T 14057-2022 Flat letterpress offset printing machine
JB/T 12152-2015 Office machinery Small offset printing press Reliability requirements and test methods
JB/T 8267-2015 Office machinery Small offset printing machine
JB/T 5433-1991 Metal plate platform offset printing machine

Company A signed a "Product Purchase and Sales Contract" with Company B. Company A ordered a four-color offset printing machine produced by it. During the use of an offset printing press, Company A discovered that the equipment had problems such as bearing damage, toothed ball damage, and air pump pipeline bursts. After both parties failed to make repairs many times, Company A filed a lawsuit with the local court, requesting that the contract be terminated in accordance with the law.
was entrusted by the court to conduct an appraisal and analysis on "whether there are quality problems" with the offset printing machine involved in the case.
identification and analysis results:
The identification and analysis expert group discussed the relevant information and on-site investigation of the offset printing machine involved in the case and conducted a comprehensive quality and technical analysis, and made the following suggestions and conclusions:
Based on the famous brand model of the equipment involved, it was found that the maximum printing speed of the offset printing machine is 9,000 sheets/hour, and the fixed speed is 4,500 sheets/hour. The center console screen shows that the total historical output of the equipment involved is more than 3 million sheets. Referring to the two-shift (16 hours/day) working system in the industry, based on the calculation of 9,000 sheets/hour, the cumulative working time is about more than 300 hours, and the number of days converted into two shifts is only more than 20 days. According to the central control display's set speed of 4,500 photos/hour and the cumulative working time of about 700 hours, the number of working days calculated in two shifts is only more than 40 days. The equipment has quality problems and cannot function properly.