-----Original Message-----
From: Craig Hillman [SMTP:[log in to unmask]]
Sent: Tuesday, December 07, 1999 5:00 AM
To: [log in to unmask]
Subject: Re: [TN] Hollow Fiber
Mr. Kim,
A hollow fiber is the result of the creation of a capillary within the
fiber. That is the glass fiber is no longer solid. Hollow fibers are
created during the glass production process and have nothing to do
with the soaking of resin (that would be more likely a root-cause of
delamination at the fiber/resin interface).
A homogeneous melt composition with negligible impurities is
necessary for the successful manufacture of glass fibers. The
decomposition of raw materials during glass melting can lead to
trapped gases. In the raw materials, water, carbonates (CO3), and
organic materials will decompose with heat to form gases. Depending
on the viscosity of the glass mixture and various manufacturing
processes, these gases can get trapped as bubbles, called seeds.
If the molten glass contains a sufficient level of impurities, air
bubbles may become trapped inside the fibers while being drawn
through the bushing. These air bubbles, unless very large, do not
cause fiber breakage but end up as capillaries in the glass fibers,
otherwise known as hollow fibers. These hollow glass fibers
increase the opportunity for failure between close conductors because
the capillary provides a convenient path for the formation of
conductive filaments.
For more information on hollow fibers and their effect on product
reliability, you may wish to read:
1. "Do You Know That Your Laminates May Contain Hollow
Fibers?" K. Rogers, et. al., Printed Circuit Fabrication, Vol. 22. No.
4, April 1999.
2. "Conductive Filament Formation: A Potential Reliability Issue in
Laminated Printed Circuit Cards with Hollow Fibers", M. Pecht, et.
al., IEEE/CPMT, Vol. 22. No. 1, January 1999.
> Dear Technetters:
>
> Have you ever experienced or heard of hollow fiber ?
> Is this in the state of hollowing between fibers or fiber itself?
> For the former, I think poor soaking of resin is the cause and the
> latter
> is intentionally developed
> fiber to reduce Dk.
> Do you have any idea to improve soaking tight bundle of fiber?
> Any comment to this is appreciated.
>
> Tal Young Kim
> Manager, Quality Assurance Team
> Doosan Corporation Electro-Materials BG
> Tel : 82-445-820-8451
> Fax : 82-445-820-8300
> E-mail:[log in to unmask]
>
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Dr. Craig Hillman
CALCE Electronic Products and Systems Consortium
University of Maryland
College Park, MD 20742
(301)-405-5316
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