Offset printing output ink quantity reset method

An ink volume and offset printing technology is applied in the field of controlling the offset printing machine to preset the output ink volume and the offset printing machine output ink volume pre-adjustment field, which can solve the problems of ink paper and time waste, increasing production costs, etc.

Inactive Publication Date: 2010-09-29
SERVICE CENT OF COMMLIZATION OF RES FINDINGS HAIAN COUNTY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This adjustment process wasted a lot of ink,

Method used

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  • Offset printing output ink quantity reset method
  • Offset printing output ink quantity reset method
  • Offset printing output ink quantity reset method

Examples

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Embodiment Construction

[0045] In the pre-press workflow, RIP software or digital workflow software can generate PPF files or TIFF files from imposition files in PDF, EPS or PS formats, in order to calculate the graphics and text of each ink area more conveniently and accurately The coverage, the resolution of the generated PPF file or TIFF file should be set according to the characteristics of the offset printing machine, the purpose is to make the number of pixels per raster an integer. For example, Roland 700 offset printing machine is used in this example. The resolution of PPF file or TIFF file is 50.8PPI. If a 1-TIFF file is generated, the resolution is 300PPI, and the number of screening lines is 30 lines / inch.

[0046] Use the input interface of the control computer to read in the PPF file or TIFF file generated before printing, input the width value of an ink area from the keyboard, take the centerline of the width direction of the digital image as the reference, and take the width of an ink ...

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PUM

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Abstract

The invention relates to an offset printing output ink quantity reset method. The present preset method is carried out by depending on experience and visual estimation, so tremendous waste is caused. The method of the invention firstly partitions digital images, computes the image-text area coverage rate of each partition area, and determines the set value of the rotating angle of an ink fountain roller according to the image-text area coverage rate value of the partition area which has the largest image-text area coverage rate in the digital images; then the method presets the printing ink of an inking system, simulates the printing ink delivery under the condition that a distributing roller does not move or moves, builds an equation set, compares the difference between the average ink thickness of each partition area of a simulated printed sheet and the standard ink thickness required by the practical printing, adjusts the given ink fountain roller to output the ink quantity, and after feedback adjustment and sequential approximation, the output ink quantity of the ink fountain roller after the last adjustment is converted into the ink key setting value. The method of the invention controls the whole output ink quantity through changing the rotating angle of the ink fountain roller, and controls the output ink quantity of each ink area through separately controlling the ink key of each ink area.

Description

technical field [0001] The invention belongs to the technical field of printing, and relates to a method for pre-adjusting the output ink volume of an offset printing machine, specifically a method for simulating the ink transmission and transfer process of an offset printing machine by using a computer connected to the offset printing machine to obtain a suitable output ink volume value, and then A method of controlling an offset printing machine to perform output ink quantity preset. Background technique [0002] Before the offset printing machine normally prints the product, it is necessary to adjust the output ink volume of the offset printing machine properly according to the distribution of the graphic and text of the printed product, the printing characteristics of the paper ink and other materials, the mechanical structure and operation settings of the printing machine. At present, most offset printing machines in my country rely on the experience of workers to prese...

Claims

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Application Information

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IPC IPC(8): B41F31/02
Inventor 余节约田培娟项秀阳
Owner SERVICE CENT OF COMMLIZATION OF RES FINDINGS HAIAN COUNTY
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