A clarification on Kodak coating practice

[Photo Engineer]

IDK if this is the best place to put this post. It is intended to clarify some of Kodak's coating practices and place some products in better perspective.

I have said in the past in many posts that Kodak coats 42" wide with a 2" discardable edge (1" on each side of the web) in 5000 ft lengths. Well, I spent most of my time with paper coating for which this is true, but in film, I dealt with the Pilot lab which coated 21" wide film coatings.

However, the newest Kodak coating machine coats 54" wide and 6000 ft lengths. So, I have to stand kind of corrected. This increases the amount of film from a single master roll by quite a bit and also increases the cost of a master roll. Of course, paper coated in Colorado is coated over 70" wide.

So, with these corrections, you now have a more complete picture of the yields and costs.

Sorry about the ambiguity, but this was brought to my attention by an EK friend recently.

PE

[eclarke]

What's the coating time for a full master roll on the new machine?..Evan Clarke

[Photo Engineer]

Lets just say that it would be less than an hour.

PE

[dpurdy]

PE, I just finished reading Team Zebra. Were you part of TZ?
Dennis

[Photo Engineer]

Dennis;

I'm not sure what you mean. "Amazing Race"? If I don't get it right, then I must not have been a part of any Kodak team with that name. Our projects were letters and numbers such as P-130 and PL-979 and etc.... Or they had formal names such as Merlin or OASIS or something like that.

The Letter + Number combination were usually product development projects with the year often incorporated into the number. The word names were usually internal projects.

PE

[Photo Engineer]

Ok, my brain malfunctioned.

No, I was not part of this team. It was at an executive and plant (MFG) level and we never interacted with them in research. Sorry.

PE

[eclarke]

Lets just say that it would be less than an hour.

PE

So roughly 195,000 4x5 sheets coated in an hour. When people start talking about the demise of film they must consider the staggering capacity Kodak alone has and how must purchasing must be done to make film production viable...EC

[Prest_400]

So roughly 195,000 4x5 sheets coated in an hour. When people start talking about the demise of film they must consider the staggering capacity Kodak alone has and how must purchasing must be done to make film production viable...EC
Indeed, it's a lot. But I guess that the greatest part of all the film coated goes to motion picture.
I seen some "kodak interesting facts" on a blog of the company, one of the facts was this one:

Each year, Kodak sells enough color print film to circle the globe more than 90 times.

[eclarke]

Indeed, it's a lot. But I guess that the greatest part of all the film coated goes to motion picture.
I seen some "kodak interesting facts" on a blog of the company, one of the facts was this one:

Yes, digital film making is the real threat to us analog still photographers...EC

[samuraiwarrior2]

What is this paper coating you mentioned in Colorado? I live there and would be interested learning more about something that goes on near home.
Thanks
Thomas

[Photo Engineer]

Thomas;

Kodak has a plant outside Denver, but I have forgotten the name of the small town it is located in. It was sold to another company (ONYX) of Canada which has changed names. Kodak now leases coating time on the equipment.

PE

[Photo Engineer]

On the original topic, some thoughts have struck me based on the posts here.

Remember that the coating machines must stay threaded with "leader". So, to coat 6000 ft of film you need 3 6000 ft rolls. One is leader, one is coating and one is trailer to rethread the machine. At startup, leader is used to start the bead, and this leads to more than 6000 ft being coated, as you don't just flip a switch and start coating. The machines take a few minutes to get up to full speed. So, figure 7000 - 14000 ft of support needed to get 6000 ft of good stuff.

Then, all of the coating may not be perfect, so they plan on up to 10% waste due to defects depending on product. So, all in all, they may coat a lot more than they want. The hope is that they sell as much as is salable.

PE

[Mick Fagan]

PE, you last post on this subject is very interesting, I knew there was wastage, but didn't know just how much wastage was possible if things didn't go too well!

Mick.

[jgjbowen]

Thanks Ron.

[Ray Rogers]

...the coating machines must stay threaded with "leader". So, to coat 6000 ft of film you need 3 6000 ft rolls. One is leader, one is coating and one is trailer to rethread the machine. At startup, leader is used to start the bead, and this leads to more than 6000 ft being coated, as you don't just flip a switch and start coating. The machines take a few minutes to get up to full speed. So, figure 7000 - 14000 ft of support needed to get 6000 ft of good stuff.

PE

???

But you don't use fresh base for the full length of each run do you?
Arn't those leaders and trailers reused ?

Ray

[mikebarger]

Based on other threads, I bet Foma ends up with .00001% wastage from their master rolls. :)

Mike

[Jim Edmond]

Thomas;

Kodak has a plant outside Denver, but I have forgotten the name of the small town it is located in. It was sold to another company (ONYX) of Canada which has changed names. Kodak now leases coating time on the equipment.

PE

I believe it's in Windsor. The Canadians must have liked the name :D

Interesting thread - I've wondered how much waste occurred before things stabilized. How do they spot a small defect in so much area? It seems to be very effective, as I don't think I've ever had a defect in Kodak film.

[Tim Gray]

How do they spot a small defect in so much area? It seems to be very effective, as I don't think I've ever had a defect in Kodak film.

I thought PE mentioned some kind of IR scanning technology at one point.

[Photo Engineer]

Ok, here I go again.................

Kodak scans every square inch of product for defects and produces a defect map for the slitting and chopping operation so that bad areas can be bypassed!

Next, regarding the machines, they must be kept in a state of "threadedness" :D. The machines must remain threaded as the threading operation is tedious. Ok, Imagine a threaded machine starting up. It has to get to speed and then they start the bead, and at that point it may be on the 6000 ft leader or on the 6000 ft master roll. In any event, some finite quantity of coating is scrap as the bead forms. Then they have good coating.

The leader with bad coating CANNOT be reused. It is "different" than bare support. Then you go on to good coating.

So, you may get 6000 ft of good. Depends.

Now, the point in retrospect that I want those doubters to consider. "do I know enough about engineering or photo materials coating to even comment?"

The reason I state this is that I have seen people here questioning Simon Galley as well. Geez folks, give us a break. Ilford and Kodak know how to make the products you buy. It is not easy, and you are not "rewarding" the guys who make it very well when you bash anyone speaking in their favor. It is a difficult and time consuming process. It may take a month beforehand to produce the emulsion, support and all of the other items that go into a product for that 1 hour or less coating session. They have to make it right and on-schedule.

PE

[Tim Gray]

It may take a month beforehand to produce the emulsion, support and all of the other items that go into a product for that 1 hour or less coating session. They have to make it right and on-schedule.


Sounds like a rocket launch. Except you have to make money on it :D

I love hearing about this stuff and am glad you share it with us. Does Kodak do plant tours like Ilford does?