We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.
Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.
TEFLON PRESSURE PLATEN
TEFLON TAPE
Fig. 2. View of splicer showing Teflon platen and tape.
pressure platen is "Teflon" (tetrafluoroethylene). The type of orientation of this Teflon block is important as Teflon has a very serious contraction and expansion characteristic. It also became necessary to restrain its mechanical motion by encasing the block with a U-shaped sleeve. One of the disadvantages of this material is that it is extremely soft and tends to mark very easily. To overcome this, a roll of Teflon tape was placed between the Teflon block and the heater block. This tape automatically advances with every splice.
Plasticizer
When heat is applied to acetate film, there is a tendency for this heat to drive out a small proportion of the plasticizer from the film. This tends to make the splice brittle. To overcome the loss of plasticizer, an automatic plasticizing unit (Fig. 3), which plasticizes the edge of the film before it is spliced, had to be added to the splicer.
This plasticizer had to handle all of the various film bases which are in existence today. In addition to preventing brittleness of the splice, the plasticizer also broadens the flow point of high-acetate film, which previously required precise heat control to within 1 F. With the introduction of the plasticizer, the permissible temperature range has been broadened by 10 F.
The Presto-Splicer, shown in Fig. 4, consists of a foundation base and an interchangeable 16mm or 35mm head. The base contains all the electrical and timing components with the exception of the heater element, located in the head assembly. The interchangeable heads can either be removed from the base or assembled thereto in about 30 sec. Two knurled screws are used for interlocking the head to the foundation base. A tongue-and-groove locking device is located on the front of the head and the base assembly in order to add additional rigidity.
Leonard A. Herzig: Film Splicing
183