film layers

[Guest manikandan]

hi firends,

i want to know about film layers.pl help me.

[John Pytlak RIP]

hi firends,

                i want  to know about film layers.pl help me.

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There are some good tutorials about film structure on the Kodak website:

 

http://www.kodak.com/US/en/motion/support/h1/selecting.shtml

 

http://www.kodak.com/US/en/motion/support/h1/dealing.shtml

 

In general, color negative film uses triacetate base, using "rem-jet" as the antihalation anti-static backing layer. It is removed by special steps in the ECN-2 process. A "subbing" layer is coated on the base to properly adhere the emulsion layers. The bottom imaging layers are sensitive to red light, and form cyan dye in the process. The middle imaging layers are green-sensitive, and form magenta dye. Next is a yellow filter layer to filter out blue light the bottom layers have "native" sensitivity to. The blue sensitive layers are the topmost imaging layers. The topmost layer is a protective gel layer that contains matte, lubricants, and surfactants to optimize the transport characteristics of the film:

 

http://www.kodak.com/US/plugins/acrobat/en.../h247/h2407.pdf

 

Kodak VISION Color Print Film uses durable Kodak ESTAR (polyester) base. Proprietary transparent scratch-resistant anti-static layers are coated on the back side, and subbing layers on the emulsion side. The emulsion layers include an antihalation layer, then the layers sensitive to blue, red, and green light, and a topmost protective layer with matte and lubricants to optimize performance during projection. Because the blue sensitive layer is very fast compared to the green and red, there is no need for a yellow filter layer, and it can be the bottom imaging layer. The green-sensitive (magenta dye forming) layer can be the topmost imaging layer to maximize sharpness. The ECP-2D process is used for color print film.

 

http://www.kodak.com/US/plugins/acrobat/en.../h249/h2409.pdf

[L K Keerthi Basu]

Dear Manikandan,

 

I think that you are from tamilnadu. The best book to refer about the film layer and other technical informaions on film please go through " Motion Picture Film Processing " by Dominic Case

 

L.K.Keerthibasu