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Splicing Motion Picture Safety Film Without Cements or Adhesives
By LEONARD A. HERZIG
A method and apparatus for butt-weld splicing motion picture film, not requiring the usual scraping or cements, are described. The principle is based on a combination of a controlled heat and cooling gradient applied under pressure within a given time cycle, and producing a homogeneous splice. Properties of the film are not affected, as the film is automatically preplasticized prior to splicing. The method may be used for all types of safety film.
JT ILM SPLICING has been a serious problem since the advent of motion pictures. The standard method of splicing, in use for the past decade, has required scraping, cementing and overlapping the film. In some cases it has also required the application of heat to speed up the drying time of the solvent. The problem has been increased with the advent of different types of safety bases such as standard acetate, triacetate, butyrate-acetate, etc. Additional difficulties are now forthcoming with the use of magnetic-striped soundtracks and magnetic film, where an overlap splice introduces distortion and loss of sound.
A new method of splicing has been developed which incorporates the principle of butt-welding film end-to-end
Presented on October 7, 1952, at the Society's Convention at Washington, B.C., by Leonard A. Herzig, Prestoseal Mfg. Corp., 37-27 33rd St., Long Island City 1,
N.Y.
and eliminates the need of scraping, cementing and overlap.
In order to obtain a satisfactory buttweld splice, many factors had to be considered. One of these was to obtain a precise controlled heat having a heat gradient confined in area to very narrow limits. Another was to find a material with a cooling gradient capable of reducing to the required temperature within a maximum period of three seconds. Of these two factors, it was found that the cooling gradient was of prime importance and took precedence in the designing of the proper heater block. Materials which have very poor heat-conducting properties, but which would have a proper heat gradient as well, were required. It was necessary that the parts be able to withstand extreme, as well as sudden, changes in temperature. Also, as mentioned previously, the heating element itself had to be capable of cooling in a period of a few seconds.
February 1953 Journal of the SMPTE Vol. 60
181