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Platter Systems: Difference between revisions
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Another risk inherent to plattering and other large-reel systems is the damage caused by the equipment used to build up and break down prints. Large reels ranging from 6,000’ to 12,000’ were used for plattering, requiring greater holdback tension, which in combination with the rewind speeds commonly employed in platter houses often resulted in print damage. Most make-up tables were also problematic from a film handling perspective. This was compounded by careless projectionists, who would fail to properly align the make-up table to the platter, resulting in platter scratches; fail to regulate feed and takeup tension, especially during breakdown (when disengaged from their drive motors to feed out to the make-up table, many platters were freewheeling and friction had to be applied by hand to regulate the tension); wind the film at excessive speeds and start and stop abruptly; leave the equipment unattended during transport, etc. | Another risk inherent to plattering and other large-reel systems is the damage caused by the equipment used to build up and break down prints. Large reels ranging from 6,000’ to 12,000’ were used for plattering, requiring greater holdback tension, which in combination with the rewind speeds commonly employed in platter houses often resulted in print damage. Most make-up tables were also problematic from a film handling perspective. This was compounded by careless projectionists, who would fail to properly align the make-up table to the platter, resulting in platter scratches; fail to regulate feed and takeup tension, especially during breakdown (when disengaged from their drive motors to feed out to the make-up table, many platters were freewheeling and friction had to be applied by hand to regulate the tension); wind the film at excessive speeds and start and stop abruptly; leave the equipment unattended during transport, etc. | ||
[[File:Plattermarks.jpg|right|thumb|400px|An example of "platter marks" on the emulsion side of a 35mm print, crossing into the optical track.]] | |||
What are often referred to as "platter marks" can occur when the picture area makes contact with the surface of the platter. This usually happens when the film is run to or from the platter using a make-up table. If the guide roller on the make-up table is too low, the lower side of the frame will drag across the platter as it spools. This typically results in slightly diagonal horizontal scratches that run from the film edge of one side, with the scratches ending partway way across the frame. Platter scratches can occur on the base or the emulsion side, depending on how the film is being spooled when the damage occurs. | |||
Kinoton make-up tables were generally much gentler on film than the other models available, using a simpler film path that required less handling of the picture area and employing Hall sensors to auto-calibrate the speed of the takup platter and perfectly regulate the film tension. However, the magnetic field generated by the Hall sensor will destroy a print with a magnetic soundtrack. | Kinoton make-up tables were generally much gentler on film than the other models available, using a simpler film path that required less handling of the picture area and employing Hall sensors to auto-calibrate the speed of the takup platter and perfectly regulate the film tension. However, the magnetic field generated by the Hall sensor will destroy a print with a magnetic soundtrack. | ||