Stress Marks on Film from Cassette

[hansblix]

I've been driving myself crazy trying to diagnose bromide drag or surge marks on parts of my negatives. Turns out it is stress marks from the cassette. Very uniform and deceiving but was confirmed when I pulled out an entire roll and examined it with clear patterns vertically from perf to perf resembling bars from top to bottom.

I've used Kalt and old Kodak XX cans but the best results seem to be reusing leader out discarded cassettes.

The problem seems to be sporadic and usually towards the end of the roll and is when it is most prevalent.

I shoot on Vision3 stock so I know its a bit thicker but has anyone else had experience with uniform stress marks within cassettes?

I have a Lloyd Bulk loader to cassettes and I do not think my F3+MD-4 is part of the equation as these rolls I looked at were not loaded into a camera yet.

I have shot over 1000' of 5219 this year alone so I am pretty well versed in bulk loading. I usually only go 24 exposures to account for thicker stock. Some cassettes seem tighter than others. Has anyone had either tight bulk loads or issues like this? Is there a way to alleviate some tension or a different way to load?

 

[AgX]

Welcome to Apug!

The velvet seal of cassettes to be reloaded can be checked by pulling a strip of virgin film through it. Any abrasion marks then should be visible under a loupe-
Of course pressure induced fogging will not show up, but it is not likely to happen, nor to happen without abrasion marks.

 

[hansblix]

I pulled apart the cassette and took out the spool and film at once after it was loaded rather than pull it back through the felt and then saw the damage.
It is either having issues with how it is sitting in the can/being wound or an intake problem. Definitely a problem on the transport side.
5219 usually sits beautifully on large cores. I am wondering if the problem lies in a thicker stock and a smaller diameter it is being wound on to or if someone else has come across the problem before also.

 

[AgX]

Sorry, just now read you first post for a second time, more mindful this time... You have it about stress marks going over the strip crosswise from hole to hole.

These are kinking marks.
We had a similar case here within the last year. But I forgot how we solved the cause of that, maybe I find that thread again.

The most obvious reason would be if the film would have been put on the spool in wrong orientation, thus entering the mouth of the cassette under a 90° angle, causing stress marks at the weakest location crosswise, where the holes are. But with you being used to bulk loading, this seems unlikely to have happened.