Film Screen

• Temperature control


  Controls developer temperature
• Developer temperature


  35°C / 95°F
• Agitation


  Up and down of the X-ray film in the chemical solution
• Circulation


  Circulates rollers and also help to remain the temperature
• Wash


  Removes chemical
• Dry


  Removes moisture, drying the Xray film
• Electrical


  Supply power to automatic film processor
• Transport/ planetary roller


  1inch for transportation of film / staggered or directly opposite to each other
• Solar/master roller


  3 inches found at the bottom of each tank of solution
• Entrance roller


  Serrated roller made of rubberized plastic to grip better
• Rollers


  • Acrylic plastic (plexiglass)
  • Stainless steel
  • Polyester plastic
  • Rubberized plastic
  • Phenolic resin
• Phenolic rollers


  Wooden has orange -brown color
• 
  

  1. Entrance rack - contain entrance rollers, guide shoes, and microswitch to activate replenishment system
• Water controlled system/ warm water processor - uses large amount of hot water and mixing valve to regulate water temp
• Heat exchanger


  Thin wall stainless steel tube located at the bottom of each tank
• Circulation system


  Ensures complete chemistry, provides uniform temperature and provides the equivalent of agitation performed in manual processing
• 2. Vertical deep rollers - transport rollers that transport film into or up out of the tank
• 3. Turn around rack - in the bottom of the tank contain master roller and guide shoes
• 4. Crossover rack moves - moves developer to fixer, fixer to wash, wash to dryer transition it contain master roller and 2 guide shoes
• 5. Crossover for wash - often called squeegee rack it helps to remove water
• Thermostatically controlled system /cold water processor - required cold water to enter the unit uses electronic heater or heat exchanger for each tank with thermostat to regulate the system
• Guide shoe marks


  Improper position or springing of guide shoes in turn around assembly
• Pi lines

  Dirt or chemical stains on rollers (should be clean every week)
• Sharp increase or decrease in optical density


  Dirty or wrapped rollers which can leave sludge deposits on film
• Uniform, dull, gray fog

  Improper processing chemistry
• Dichroic stain / curtain effect

  Improper squeezing of processing chemicals from film
• Pressure marks


  Irregular or dirty rollers small circular patterns are produced
• Yellow- brown drops on film

  Oxidizer developer
• Milky appearance


  Unreplenished floor
• Greasy appearance


  Inadequate washing
• Brittle appearance

  Improper dryer temperature / hardener in the fixer
• Decrease in density

  Developer exhausted
• Decrease in density

  Developer unreplenished
• Decrease in density

  Processor running too fast
• Decrease in density

  Low developer temperature
• Decrease in density

  Developer improperly mixed
• Increase in density

  Developer over replenishment
• Increase in density

  High developer temperature
• Increase in density

  Light leak in processor
• Increase in density

  Developer improperly mixed