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Effective of Scribing Wheel Dimensions on the
Cutting of AMLCD Glass Substrates
Technical Information Paper
TIP 306
Issued: November 2004
Supercedes: xxxxx
Toshihiko Ono
Corning Japan K.K., Shizuoka Technical Center, 12117, Obuchi, Osuka, Ogasa, Shizuoka, 437-1397, Japan
Kohichi Tanaka
Nagaoka University of Technology, Department of Mechanical Engineering, Materials Science and Engineering Group, 1603-1,
Kamitomioka-cho, Nagaoka, Niigata, 940-2188, Japan
Abstract
The scribe and break method for glass cutting is
widely used to separate individual Liquid Crystal
Display (LCD) panels from a larger mother substrate
cell. Optimum glass scribing conditions including
scribe wheel dimensions, scribing load, scribing
speed, etc, have been determined based on practical
manufacturing experience. However, there has been
no systematic study to determine the scribing
conditions necessary to avoid stray breakage. In this
paper, the influence of the scribe wheel angle and
diameter upon the scribing and the breaking of an
Active Matrix Liquid Crystal Display (AMLCD)
glass substrate, Corning Code1737F glass, was
experimentally investigated for the case of simple
single glass sheet separation. It was determined that
an equation including the factors of scribe wheel tip
angle and diameter can be used to predict median
crack depth as a function of scribe load. It was
further found that the breaking force of the scribed
sheet was strongly influenced by the residual stress
created during scribing. A wheel having a 130° tip
angle and 4mm diameter demonstrated the best
results for sheet separation in terms of the lowest
breaking force without lateral crack propagation. In
addition, increasing the time interval between
scribing and separating was found to result in an
increase in the breaking force required to separate
glass substrate.
Introduction
The scribe and break method employing a tungsten
carbide wheel is widely used to separate Liquid
Crystal Display (LCD) panels from a large mother
glass substrate cell. Scribing is a key process to glass
separation (cutting). If the scribing conditions are not
optimized, clean cutting of the mother cell sometimes
becomes difficult due to the formation of lateral
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