Aeroelastic instability of paper sheet in an offset printing press

2021 ◽  
Author(s):  
Petr Šidlof ◽  
Jan Kolář ◽  
Pavel Peukert ◽  
Martin Pustka ◽  
Pavel Šidlof
Keyword(s):  
Printing Press ◽  
Paper Sheet ◽  
Offset Printing ◽  
Aeroelastic Instability

Development of Modularized Inline Coating System of Multi-Color Offset Printing Press

2013 ◽  
Vol 312 ◽  
pp. 525-528
Author(s):  
Ji Bin Zhao ◽  
Cheng Nan Tong ◽  
Zhao Hua Wang ◽  
Fan Wu
Keyword(s):  
Printing Press ◽  
Coating System ◽  
Offset Printing ◽  
The Press ◽  
New Type ◽  
Printing Machine

A new type of inline coating system is designed and developed. The coating system can be mounted into printing press instead of blanket cleaner. An anilox roller and a sealed duct on the glazing oil transferring part for supplying and transferring the coating oil are introduced. A set of pressure adjusting mechanism is designed for changing the pressure between anilox roller and blanket cylinder, while a set of on-off impression mechanism is arranged to change the position of anilox roller and the on-off impression state. The press can print as normal when the coating system is dismounted. With this coating system, the press can coat prints with glazing oil. This system can be mounted in various type of printing machine. One new type of glazing technology named reverse coating can be achieved when it is mounted in multicolor press.

A Brief Analysis of Vibration on the Printing Area in Ordinary Offset Press

2012 ◽  
Vol 591-593 ◽  
pp. 2091-2094
Author(s):  
Ming Yang ◽  
Jin Yao Li ◽  
Jia Cong Chen ◽  
Shi Jia Kong
Keyword(s):  
Product Development ◽  
Noise Reduction ◽  
Mechanical Vibration ◽  
Practical Experience ◽  
Printing Press ◽  
Print Quality ◽  
Offset Printing ◽  
The Press ◽  
Vibration Performance ◽  
Printing Presses

At the development of modern printing, vibration may course some products quality problems when increases the speed. Practical experience shows that the mechanical vibration of the offset press is an important reason to affect the print quality. Therefore, improving the vibration performance of the printing press and designing the structure of anti-vibration and noise reduction to improve the quality and speed of printing presses is an important issue in the press product development. This paper proposes some reasons and solution ideas of vibration on printing parts in ordinary offset printing machines.

Exploring on the Print-through Criterion of Offset Printing

2013 ◽  
Vol 785-786 ◽  
pp. 1582-1585
Author(s):  
Yong Gang Yang ◽  
Li Li Mu ◽  
Yang Lu
Keyword(s):  
Printing Press ◽  
Offset Printing ◽  
Paper Properties ◽  
Printing Speed

In order to control digitally the print-through, the print-through criterion of offset printing was studied in this article. For 4 given paper samples, the paper properties including paper opacity and K&N ink absorbency were tested, and then print-through value expressed with ΔDand ΔEab*was measured under 9 sets of printing condition. The results showed that lower printing press and higher printing speed were helpful to reduce the print-through. And under the same printing conditions, the print-through value of cyan ink print was slightly larger than that of magenta ink print. In addition, the print-through values of offset paper samples were a bit larger than that of newsprint samples. In particular, no matter what kind of conditions were, the print-through value expressed with ΔDand ΔEab*were lower than 0.04 and 4NBS when thePTRvalue was larger than 72%. The criterion of print-through was firstly given, which was very helpful to choose paper during the offset printing.

Dynamic Analysis of Offset Printing Press Gear-Cylinder-Bearing System under Time-Varying Meshing Stiffness Effect

2015 ◽  
Vol 656-657 ◽  
pp. 658-663
Author(s):  
Tian Cheng Ou Yang ◽  
Nan Chen ◽  
Cui Cui Ju ◽  
Cheng Long Li ◽  
Jiang Hu Li
Keyword(s):  
Equations Of Motion ◽  
Transmission System ◽  
Gear Transmission ◽  
Printing Press ◽  
Time Varying ◽  
Offset Printing ◽  
Meshing Stiffness ◽  
Lumped Parameter ◽  
Gear Transmission System ◽  
Bearing System

This study propose a new nonlinear model for offset printing press gear-cylinder-bearing system by the lumped parameter approach. The multi-DOF model consists of helical gear pairs and spur gear pairs with time-varying meshing stiffness. Bearing and shaft flexibilities are include in the model as well. The equations of motion are obtained by Darren Bell principle and Runge-Kutta numerical method is used to slove the equations of motion. The results show that meshing stiffness and bearing stiffness significantly affect critical speed, vibration acceleration and meshing force. Multi-body dynamics software are applied to compare with lumped parameter model. The results show that there are many similarities in different aspects. Results of experimental study on offset printing press are also presented for validation of different models. After Discrete Fourier Transform, the graphics display that acceleration peaks frequencies are an integer multiple of the gear mesh frequency. It demonstrate that mechanical vibration is mainly from gear transmission system at high printing speed and gear transmission system lead to nonlinear vibration. This work provide a foundation for further improvement of the dynamics of gear system.

Model of a Multi-Sectional Web Offset Printing Press Drive Section, Controlled by Electronic Shaft

2006 ◽  
Vol 113 ◽  
pp. 103-108 ◽  
Author(s):  
Vytautas Kazimieras Augustaitis ◽  
V. Gičan ◽  
I. Iljin ◽  
N. Šešok ◽  
Vilius Geleževičius
Keyword(s):  
Printing Press ◽  
Dynamic Processes ◽  
Offset Printing ◽  
Structural Scheme ◽  
Control Block ◽  
Drive Section ◽  
Linear And Nonlinear ◽  
Electronic Parts ◽  
Nonlinear Dynamic Processes ◽  
The Mathematical Model

For synchronization of sections of modern printing machines and equipment of such sections, driven by individual drives the system of “electronic shaft” is widely used. A development of the mathematical model of such a local drive, consisting of mechanical and electric-electronic parts as well as links between them, is provided. The model with an effective adaptive control block for increasing accuracy of the drive is provided in the form of a structural scheme. It, first of all, is usable for investigations of linear and nonlinear dynamic processes that take place in the mechanical part of the drive. Processes that take place in the electric drive are not detailed in this article. An example of the application of the model is provided.

Offset Printing Press

2004 ◽  
Vol 107 (1031) ◽  
pp. 803-806
Author(s):  
Hitoshi ISONO
Keyword(s):  
Printing Press ◽  
Offset Printing
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