[Blindmath] Questions regarding the resolution of "swell paper" embossing

[kelly marts]

Our braillists are using the duxbury font at 26. Their lines vary based on need. 
They attempt to follow the Tactile Graphics guidelines from the Natl. Braille. 
Assoc. K




________________________________
From: Richard Baldwin <baldwin at dickbaldwin.com>
To: BlindMath Mailing List <blindmath at nfbnet.org>; accessibleimage at freelists.org
Sent: Tue, March 13, 2012 12:13:10 PM
Subject: [Blindmath] Questions regarding the resolution of "swell paper" 
embossing

I've been searching without success for information regarding the effective
resolution of the "swell paper" approach to tactile graphics.

I'm aware that many factors are in play, such as the type of ink used in
the printing process and the quality of the heating process.

In general, assuming good ink and heat conditions, does anyone know:

1. How wide must a printed line be in order to be raised in the heating
process?
2. How far apart must two raised vertical lines be to be discernible as
separate lines?
3. How far apart must two raised horizontal lines be to be discernible as
separate lines (if different from vertical lines)?

Thanks,
Dick Baldwin

-- 
Richard G. Baldwin (Dick Baldwin)
Home of Baldwin's on-line Java Tutorials
http://www.DickBaldwin.com

Professor of Computer Information Technology
Austin Community College
(512) 223-4758
mailto:Baldwin at DickBaldwin.com
http://www.austincc.edu/baldwin/
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