 |
|
 Home
Products
Store
Forum
Warehouse
Contact Us
|
|
|
|
 
|
|
Author
|
Topic: NATO Team Studying Print Sheading
|
|
|
|
|
|
|
John Pytlak
Film God
Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000
|
posted 09-01-1999 02:25 PM
Projector abrasion of film and print shedding are affected by many factors. The film stock itself (triacetate vs. polyester, color vs. black-and-white) is a factor.Proper print lubrication is a major factor --- Kodak processing specifications and SMPTE Recommended Practice RP151 specify that 35mm prints be lubricated to optimize projection wear. Edge-waxing of prints by the labs used to be normal practice, but environmental restrictions on the solvents used have practically eliminated proper print lubrication. Some projectionists have seen significant improvement by lubricating prints. Projector design and maintenance is a factor --- especially the design, materials, and finish used for the gate rails and intermittent shoe. We have offered assistance to projector manufacturers and suggested changes to reduce projector abrasion that have already shown positive results. Some projectors are much less prone to abrasion problems. Moisture is a factor, as freshly processed "green" prints or very high humidity can cause the gelatin emulsion to soften and be more prone to abrasion. If the emulsion starts to build up on the hot gate rails, it hardens into a hard "gunk"-like deposit that can further abrade the film. This phenomena has been documented since the 1920's. In the last ten years, projector abrasion has become an even greater issue because digital soundtrack information is printed in areas of the print that are severely abraded by some projectors. Projector wear and abrasion can significantly increase the error rate, and even cause the sound to default to analog. Through participation in user groups like this, and feedback at our training seminars, Kodak is very aware of projector abrasion concerns, and has been actively working to further improve the abrasion resistance of both color and black-and-white print stocks. Internal tests of the films on abrasion-prone projectors have been very promising. Millions of feet of film are already being tested by our customers, and more is soon to come. We hope to arrange use of the improved film on complete releases of upcoming movies, so we can accurately measure the performance in "real life" theatres on a wide variety of projection equipment.
| IP: Logged
|
|
|
|
|
|
|
|
All times are Central (GMT -6:00)
|
|
Powered by Infopop Corporation
UBB.classicTM
6.3.1.2
The Film-Tech Forums are designed for various members related to the cinema industry to express their opinions, viewpoints and testimonials on various products, services and events based upon speculation, personal knowledge and factual information through use, therefore all views represented here allow no liability upon the publishers of this web site and the owners of said views assume no liability for any ill will resulting from these postings. The posts made here are for educational as well as entertainment purposes and as such anyone viewing this portion of the website must accept these views as statements of the author of that opinion
and agrees to release the authors from any and all liability.
|
|
|
|
Printer-friendly view of this topic