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Technical Report PVA Concentration in Short Precoat

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short precoating process

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Technical Report PPD Standard layout Technical Report

REPORT TITLE

SUB TITLE

2001-06-15

TVR-

Division

Philips ComponentsAbstract

Report no:TVR-

Date: 2001-06-15

Title:REPORT TITLE

Keywords:Keywords

Author(s):Bart van Riet

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TABLE OF CONTENTS11Introduction

2Experimental22.1Experimental set-up23Third chapter3Acknowledgments3References4Definitions, Acronyms and Abbreviations4

1 Introduction

The short precoat process has been released for CMT[1]. Study of the short precoat process in CMT shows that a PVAl concentration of 0.2 wt% gives results comparable with the traditional precoat process[2].

The objective of this experiment is to see if short precoating of TVT types can also be conducted with 0.2 wt% PVAl. Therefor 32WSRF screens were precoated using the short precoating process with varying PVAl concentrations.

2 Experimental

The 32WSRF screens were washed according to the standard TTC method. Three reference screens were precoated using the standard TTC method. Ten screens were used for short precoating. The short precoat composition was varied as follows:

short precoat composition

screenPVAl [wt%]HNO3 [wt%]demi water [wt%]

10.100.0499.86

20.100.0499.86

30.150.0499.81

40.150.0499.81

50.200.0499.76

60.200.0499.76

70.250.0499.71

80.250.0499.71

90.300.0499.66

100.300.0499.66

All the screens were matricized according to the standard TTC method. Trial conditions can be found in appendix I.

The Matrix Window Width (MWW) was measured for all screens in the centre, 2/3 positions and the corners.

3 Results

The average MWW in the centre, 2/3 positions and the corners is shown in figures 1 3 respectively.

4 Third chapter

Acknowledgments

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References

[1] PEINSIPP R.; Transfer release short precoating; TLB-420-97-PEI-051; 1997 March 26

[2] PENNERS H.J.; Shortening of the PVAl precoat process for matricized screens; TVR-47-91-HP/D0238; 1991 October 16

Definitions, Acronyms and Abbreviations

Abbrevations in alphabetical order

Philips Components B.V.

Display Components Eindhoven