Rotary-knife stripper facilitates removal of X ray film from the daylight pack paper sleeve. The new stripper is rectangular, approximately 4 inches wide, 5 inches high, and 7 inches long

Mitchell, D. K.

English

NASA Technical Reports Server

November 1968
	 Brief 68-10509 
NASA TECH BRIEF 
NASA Tech Briefs are issued to summarize specific innovations derived from the U.S. space program, 
to encourage their commercial application. Copies are available to the public at 15 cents each 
from the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151. 
Rotary-Knife Stripper Facilitates Removal of X-Ray Film from Pack 
A rotary-knife stripper has been designed to facili-
tate removal of X-ray film from the daylight pack 
paper sleeve. Previously, either a thin blade was used 
to slit the paper from two sides to allow release of the 
film, or the hands were simply used to strip the paper. 
The blade not only required frequent sharpening or 
replacement, but also occasionally scratched the film. 
Stripping by hand also tends to scratch the film and, 
in addition, introduces troublesome static electri-
cal charges. 
The new stripper is rectangular, approximately 4 
inches wide, 5 inches high, and 7 inches long. The 
lead end of the exposed X-ray film is fed into the 
stripper by means of rollers, which keep the film 
flat and centered as it meets the cutters. These are 
self-sharpening, power-driven rotary knives, which 
are mounted one above the other on each side of the 
film strip. The knives are positioned to trim 1/16 
inch from each edge of the sleeve as it passes through 
the stripper. On emerging from the stripper, the film 
may be wound on a take-up reel, while the paper strips
and edge trimming are collected in a trash receptacle.

The slitter can be mounted on the apron of an auto-

matic film processor, and the film led directly into

the developer, without being wound on a take-up reel. 
Notes: 
I. This stripper would be useful in any, industrial 
or commercial X-ray laboratory that uses daylight 
pack roll film in sections longer than four feet. 
2. Documentation for the innovation is available from: 
Clearinghouse for Federal Scientific 
and Technical Information 
Springfield, Virginia 22151 
Price $3.00 
Reference: B68-10509 
Patent status: 
No patent action is contemplated by NASA. 
Source: D. K. Mitchell 
of The Boeing Company 
under contract to 
Marshall Space Flight center 
MFS-l4837 
Category 05 
This document was prepared under the sponsorship of the National 
Aeronautics and Space Administration. Neither the United States 
Government nor any person acting on behalf of the United States
Government assumes any liability resulting from the use of the 
information contained in this document, or warrants that such use 
will be free from privately owned rights.
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Rotary-knife stripper facilitates removal of X-ray film from pack

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