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LOCKING CLAMPS EDGE FLOW PLATE
STATIONARY KNIFE BLADE
Fig. 5. Details of Presto-Splicer.
method no scraping or cements are used, it is relatively easy to splice raw stock without light. It is a decided advantage when splicing 16mm raw stock in this way to move the indexing pin to the center of the frame in order to avoid having to reperforate in the dark. This method of splicing has been successfully used in darkrooms for processing, eliminating the need for stapling leader stock to "takes." It has also been used by a few of the larger companies for telefax work, where temperatures in the developing tank go as high as 125 F, thus avoiding the trouble encountered when rivets are used.
Effect of Ambient Temperature and Relative Humidity on Splicing
Temperatures ranging from 70 to 80 F seemingly have no effect on the splicing. When the ambient temperature rises above 80 F, it is necessary to reduce the current by 5%. This 5% is correct for all temperatures up to 1 1 5 F. When the ambient temperature
of the room ranges between 55 and 68 F, the current is increased 5% over the normal setting.
Relative humidity ranging from 40 to 100% is exceptionally good for the butt-weld method. When the relative humidity is between 10 and 20%, it is necessary to keep the plasticizer wick very moist.
Tensile and Flexing Strength
Tensile strength of the butt-weld splice ranges between 90 and 95% of the film itself. The flexing strength has not been tested on a flexometer but has been placed on endless loops in all types of projectors. Tests have been run in excess of 1,000 times before any edges showed signs of cracking.
Conclusion
Butt-weld splicing has many advantages over conventional cement splicing. Splices can be made every 10 sec and used immediately in the darkroom either for raw stock, negative, positive,
Leonard A. Herzig: Film Splicing
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