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Reduction of Linearly Varying Term of Register Errors Using a Dancer System in Roll-to-Roll Printing Equipment for Printed Electronics

  • Cheol Kim
  • Sung Woong Jeon
  • Chung Hwan KimEmail author
Regular Paper
  • 81 Downloads

Abstract

Roll-to-roll printing equipment can be used to manufacture flexible electronic devices with multilayer structures. This manufacturing process requires both precise tension control of the web and high register accuracy between printed layers. Because of the high temperature of the dryer required for sintering inks, the web after printing undergoes considerable shrinkage. This shrinkage brings out an accumulated phase difference between each of the printing layers and a linearly varying term in the register errors. This error can be removed by elongating the shrunk web, or by transferring the web at the same linear velocities using rollers with identical diameters. However, the elongation causes high increase in tension that can damage the previously printed layer. Moreover, a very small difference between the diameters of the printing rollers because of the tolerance in the machining process of the roller can still produce a linearly varying term in the register errors although the web has recovered from shrinkage. This paper proposes a linear dancer system to remove the linearly varying term of the register errors caused by small difference in the diameters of the printing rollers. The dancer system is designed to synchronize the velocity of the second printing roller with the movement of the dancer to ensure that the dancer controls the tension within a limited range of movement of the dancer. Simulations as well as experiments show that the proposed dancer system and control method can eliminate the linearly varying register error and control the tension effectively. As a reverse application of the proposed method, it is also presented that a larger difference between the diameters of the printing rollers can decrease the stabilized tension for elongating the web to compensate for the shrinkage, which can reduce possible damage to previously printed layers during the manufacturing process of printed devices.

Keywords

Dancer Register control Tension control Roll-to-roll Printed electronics 

List of Symbols

Ai

cross-sectional area of the i-th span of the web

Di

diameter of the i-th printing roller

E

Young’s modulus of the web

Li

length of the i-th span

Rs,i

register errors caused by the web strain

Rρ,i

register errors caused by phase difference

Ti

tension variation of the web

ti

tension of the i-th span of the web

ti0

set tension

Vi

velocity variation of the web

vi

transferring velocity of the i-th span of the web

vi0

set velocity of the web

Xi

positional variation of the linear dancer

xi

moving distance of the linear dancer

α

thermal expansion coefficient of the web

εi

strain of the i-th span of the web

ρi

density of the i-th span of the web

τ

time constant

θ

temperature difference of the web in the dryer

Notes

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Copyright information

© Korean Society for Precision Engineering 2019

Authors and Affiliations

  1. 1.Department of Mechanical EducationSamcheok Meister High SchoolSamcheokSouth Korea
  2. 2.Department of Robotics EngineeringDaegu Gyeongbuk Institute of Science and Technology(DGIST)DaeguSouth Korea
  3. 3.Department of Mechanical & Matallurgical Engineering EducationChungnam National UniversityDaejeonSouth Korea

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