Patterns with small lettering and intricate designs are prepared by using two-dimensional artwork, photographic reduction and Dycril. Two-dimensional artwork and photographic processes replace conventional relief work. Artwork size is convenient and does not restrict lettering and design size in casting

Willment, D. A.

English

NASA Technical Reports Server

May 1971	 Brief 71-10127 
NASA TECH BRIEF 
Langle y Research Center 
NASA Tech Briefs announce new technology derived from the U.S. space program. They are issued to encourage 
commercial application. Tech Briefs are available on a subscription basis from the National Technical Information 
Service, Springfield, Virginia 22151. Requests for individual copies or questions relating to the. Tech Brief program may 
be directed to the Technology Utilization Office, NASA, Code KT, Washington, D.C. 20546. 
Photosensitive Plastic Used to Produce Three-Dimensional Casting Patterns 
The problem: 
The lower size limit and intricacy of lettering and 
designs on cast plaques is restricted by the re-
quirements that conventional patterns be three dimen-
sional and that they be prepared in the same size as 
the final casting. 
The solution: 
Using two-dimensional artwork, photographic re-
duction techniques, and Dycril (a commercially avail-
able, photosensitive-plastic relief printing-plate mate-
rial), three-dimensional casting patterns with much 
smaller lettering and more intricate designs can be 
prepared. 
How it's done: 
Two-dimensional artwork of convenient size is pre-
pared in the form of a line drawing, printer's 
proof, or commercially available "rub-down" letter-
ing. The two-dimensional artwork is then photograph-
ically reduced to a high contrast ortho-negative of the 
desired size. Using the negative and high intensity 
collimated light, the photosensitive plastic is ex-
posed. The plastic is then developed in a 0.18% 
aqueous solution of sodium hydroxide, forming a
three-dimensional male pattern for the conventional 
female sand mold. Plaques and related products can 
be cast and finished using conventional techniques. 
The use of photosensitive plastic in preparing 
casting patterns for plaques has several advantages: 
Two-dimensional artwork and photographic processes 
replace the conventional relief work; the size of the 
two-dimensional artwork is a matter of convenience 
and does not restrict the size of lettering and de-
signs in the casting; more intricate detail in the 
casting is possible; and, the process is inexpensive. 
Note: 
Requests for further information may be directed 
to:
Technology Utilization Officer 
Langley Research Center 
Hampton, Virginia 23365 
Reference: TSP71-10127 
Patent status: 
No patent action is contemplated by NASA. 
Source: David A. Willment

Langley Research Center

(LA R- 10742) 
Category 08 
go
This document was prepared under the sponsorship of the National
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	 information contained in this 1ocurncnt, or warrants that such use 
Government nor any person acting on behalf of the United States
	 will be free from pri;'•telv wncd.rights.
https://ntrs.nasa.gov/search.jsp?R=19710000126 2020-03-17T02:22:49+00:00Z


Photosensitive plastic used to produce three-dimensional casting patterns

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