ripped film from canister

[Paul N]

I recently shot some ilford fp4+ and found the wind-on getting more and more difficult from shots 32 to 36. The final wind on ripped the film right out of the canister. Shots 1-31 felt fine.

Fortunately I was able to open the back of the Ikon in my dark bag and all the shots came out of processing perfectly exposed and uncreased.

Has anyone else experienced this? Any ideas on cause. I've yet to see if the problem is a one off experience.

 

[jschrader]

only with bulk loaded film :bang:

 

[sevo]

It is common with bulk loaded film and some odd brands with weakly attached film (e.g. some Efke batches). But on regular factory loaded film it is a indication that the camera might want service - usually it means the take-up spool mechanism has lost its inbuilt slip. As intended it should only collect the film fed by the sprockets, and not pull on the film itself (the transport sprockets themselves will only tear the sprockets, not the full width of the film).

 

[Dwig]

I recently shot some ilford fp4+ and found the wind-on getting more and more difficult from shots 32 to 36. ...

Has anyone else experienced this? Any ideas on cause. I've yet to see if the problem is a one off experience.

I've seen binding happen quite a number ofl times to my customers back when I ran camera stores. It usually proved to have been caused by one of two things:

1. Improper loading where the leader was threaded through a slot on the takeup spool and out the other side, or some similar missloading, causing the wound film to have a lump which would eventually start binding when the takeup spool filled.
2. Faulty camera where the slip clutch in the takeup spool's drive slipped too easily and the film wound very loosely on the spool and would begin to bind as it filled.

Neither of these would lead to tearing the film at the end of the roll unless the takeup binding led the user to forcing the wind and prevented them from noticing that the end of the roll had been reached. There were also other occasional causes involving some "evil entity" to cause the rewind shaft to bind or to block the rotation of the rewind knob. These, though, tended to occur at any and all random points in the roll.

 

[Paul N]

I suspect I am guilty of threading the leader too far into the take up spool. This would have caused the increased friction as you say and that I suspect caused me to fail to notice the end of the reel and push past it. The film did not rip in two, it only ripped off the canister spindle. Thankfully nothing looks broken.