Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for testing screen line number and screen angle for printed matter

A technology of screen line number and screen angle, applied in screen printing, printing, printing plate preparation, etc., can solve the problems of low degree of automation and low precision, and achieve the effect of high degree of automation and convenient use

Inactive Publication Date: 2010-09-01
CHANGSHU RES INST OF DALIAN UNIV OF TECH CO LTD
View PDF4 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for testing the number of screen lines and screen angle of printed matter, which solves the problems of low accuracy and low degree of automation in determining the number of screen lines and screen angle based on experience

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for testing screen line number and screen angle for printed matter
  • Method for testing screen line number and screen angle for printed matter
  • Method for testing screen line number and screen angle for printed matter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0045] Step 1: Select the number of screen lines to be 175 lines / inch, divide according to the interval of 1dpi, and divide into 165-185 screen levels. Calculate the line width / 2=0.0726mm of 175 / dpi; line width / 3=0.0484mm, as shown in Table 1. Set the line width that matches the output points of the laser imagesetter=4 / dpi; as shown in Table 1, taking 175 lines as an example, then R=H 3 +C 3 +(C 4 / 2)-(C 3 / 2) (wherein R=22.0940mm; H3=21.9480mm; C3=0.1460mm; C4=0.145mml store the data and calculate, draw the circle, according to this method, draw 165-185 lines / inch in the same way The concentric circles.Using the Moiré fringe principle formula, the number of screen lines in the same set of printing plates is the same, so the formula can be transformed into When the included angle is smaller, the included angle is close to 0° for the network ruler algorithm. At this time, the moiré spacing is larger, which exceeds the resolution of the human eye. At this time, the human eye...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for testing screen line number and screen angle for a printed matter, which comprises the following steps of: designing a print screen ruler, wherein the print screen ruler is semicircular, the horizontal scale is the screen line number, and the circumferential scale is the screen angle; segmenting the screen line number in a certain range, selecting the line width matched with a laser typesetter, storing and calculating the data, and outputting the print screen ruler through the laser typesetter; and placing the obtained print screen ruler on a printed image to be tested, moving the print screen ruler until clear moire fringe appears on the print screen ruler, and obtaining the screen line number and screen angle of the image to be tested, namely the screen line number and screen angle corresponding to the circular arc passing through the centre of a circle of the moire fringe. The method for testing the screen line number and screen angle for the printed matter has the advantages of high degree of automation, convenient use, and quantized reflection of the screen line number and screen angle for the printed matter.

Description

technical field [0001] The invention belongs to the technical field of packaging and printing, and relates to a method for testing printing parameters, in particular to a method for testing the number of screen lines and screen angle of printed matter. Background technique [0002] At present, the printing industry still relies on experience to identify the number of screen lines and screen angles of printed products. The usual identification method is to rely on experienced masters to determine the number of lines and angles, and then descreen when scanning. Its precision is low and the degree of automation is not high. The method of identifying the number of screen lines and screen angle by using the principle of moiré fringe generation has not yet been involved, so using the screen ruler to test the screen line number and angle of screened printed matter has a good application prospect. Contents of the invention [0003] The purpose of the present invention is to provi...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G03F5/00B41C1/00
Inventor 郭凌华谢雨林郭新华智川
Owner CHANGSHU RES INST OF DALIAN UNIV OF TECH CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com