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Method for evaluating wrinkles of printing paper

An evaluation method and paper technology, applied in the fields of electrical recording technology using charge graphics, equipment for electrical recording technology using charge graphics, and electrical recording technology, can solve problems such as difficult paper wrinkle mechanism effective research

Active Publication Date: 2022-01-14
CHENGDU TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a wrinkle evaluation method of printing paper to solve the problem in the prior art that it is difficult to effectively study the paper wrinkle mechanism in the laser printing process, and to provide a theoretical model for studying the printing wrinkle process of laser printers , for the purpose of providing a theoretical basis for technically solving the problem of printing wrinkles

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  • Method for evaluating wrinkles of printing paper
  • Method for evaluating wrinkles of printing paper
  • Method for evaluating wrinkles of printing paper

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] A wrinkle evaluation method for printing paper, comprising:

[0073] S1. Establish the paper undulation model caused by uneven conveying speed, and calculate the paper undulation α:

[0074] Take the starting point of the paper undulation as the origin, establish a plane two-dimensional coordinate system X-Y, and take the negative direction of the Y axis as the paper conveying direction;

[0075] with y=y d As the measurement position, the paper waviness α is calculated by the following formula:

[0076]

[0077] L d =2y d tan(β-θ);

[0078] lambda d =y d [tanβ-tan(β-θ)];

[0079] In the formula, y d is the vertical coordinate of the measuring position, β is the longitudinal deflection angle of the paper, θ is the lateral deflection angle of the paper, H d is the paper undulation height of the measured position; λ d is the lateral offset of the paper;

[0080]

[0081] where x 1 1 / 2 of the horizontal reference length when the paper does not fluctuate, ...

Embodiment 2

[0095] A wrinkle evaluation method for printing paper:

[0096] (1) Firstly, analyze the fold generation process as follows:

[0097] Near the entrance of the roll gap, the paper fluctuates (that is, transverse bending deformation); the undulating front end (paper head) approaches the roll gap, and the undulations gradually expand from the paper head to the paper tail; the undulating front end enters the nip of the roll gap, and wrinkles occur; the undulation continues to enter Roll gap, folds increase.

[0098] (2) According to the above wrinkling process, the model of paper undulation caused by uneven feeding speed is established as follows: figure 1 shown.

[0099] In this model, the paper conveying direction is the negative direction of the Y axis.

[0100] First assume that there is no relative sliding between the paper and the roller, and the area where the paper does not undulate remains flat.

[0101] The longitudinal offset λ of the paper at the nip can be express...

Embodiment 3

[0127] A method for evaluating the wrinkle of printing paper. On the basis of any of the above-mentioned embodiments, this embodiment evaluates the first limit value f of the degree of wrinkle when the paper is wrinkled by an experimental method. 1 .

[0128] (1) Basic parameters of the experiment:

[0129] In order to reflect the deviation of speed distribution, this embodiment directly uses heating rollers whose diameter changes along the length direction (the middle diameter is larger than the diameter at both ends and changes uniformly) for paper conveyance, so as to measure the speed distribution in the direction of the roller axis and obtain undulating paper. Table 2 lists other experimental basic parameters.

[0130] Table 2 Basic parameters of other experiments

[0131]

[0132] (2) Experimental device and method:

[0133] In this embodiment, the laser scanning method is used to measure the undulating shape data of the paper at the measurement position along the ...

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Abstract

The invention discloses a method for evaluating wrinkles of printing paper, which comprises the following steps of establishing a paper fluctuation model caused by non-uniform conveying speed, and calculating a paper fluctuation degree alpha, judging whether the fluctuation paper transversely slides in the roller gap or not, and judging whether the fluctuation paper is wrinkled in the roller gap or not according to the fluctuation degree alpha of the paper, if alpha is greater than or equal to a first limit value f1, judging that the paper is wrinkled, if alpha is smaller than the first limit value f1, judging that the paper does not wrinkle. The invention provides a method for evaluating wrinkles of printing paper, which aims to solve the problem of difficulty in effectively researching a paper wrinkle mechanism in a laser printing process in the prior art, and provides a theoretical model for researching a printing wrinkle generation process of a laser printer. And a theoretical basis is provided for technically solving the problem of printing wrinkles.

Description

technical field [0001] The invention relates to the field of laser printing, in particular to a wrinkle evaluation method of printing paper. Background technique [0002] Since the paper used in laser printers is a flexible medium, typical problems in the transmission process include page failure, paper jam, skew, curl, wrinkle, etc. The wrinkle problem in the printing process of laser printers is one of the most serious problems above. The specific description is: one or more thin strip-like wrinkles appearing on the printed paper roughly along the length of the paper, which directly affects the reliability of the printed copy in severe cases. readability. Almost all brands of printers have the problem of printing wrinkles, which has always been a problem that plagues major manufacturers and technicians, and affects the efficiency of printer product development. [0003] According to experience, printing wrinkles are rare in the early stage of a new printer, and often occ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G15/00G06F30/20
CPCG03G15/5029G06F30/20G06F2119/14
Inventor 刘平平张慧洁文广左芳君贾美薇
Owner CHENGDU TECH UNIV