Film-Tech Forum ARCHIVE: Film Hump

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Posted by Robert E. Allen (Member # 1351) on 02-16-2014, 03:40 PM:

I received a pristine replacement print of "Ender's Game" and when it comes off the platter it develops a hump in the center section causing the platter to stop and start rather than run smoothly. Also, no matter which platter I put it on it will not take up tightly but our policy trailer and previews do just fine. What's with that?

Posted by Brad Miller (Member # 2) on 02-16-2014, 03:43 PM:

If you look very carefully at the sprocket holes, you will see one side is slightly stressed. it might just be the corner of the sprocket holes, or the actual edge where the SDDS tracks would reside might be slightly creased.

It won't hurt anything being ran on a platter. If you were running reel to reel then some cinch damage could happen over time due to the repeated stress of rewinding, but you aren't.

Posted by Louis Bornwasser (Member # 3063) on 02-16-2014, 05:11 PM:

Occasionally there is a film that has the holes cut off square; one hole is ahead of the other just a little bit. Use a square or a piece of paper to determine this. Brad's idea also works. louis

Posted by Jim Cassedy (Member # 4115) on 02-16-2014, 08:08 PM:

^^^^^^^^^
What Brad said. Especially if the print feels "spongy" after take up.
(Which will also make it a bitch to move if you have to. The print will
be verrrry 'floppy' needing as many clamps as you can get onto it.

You might have to look at the perfs under magnificaion to see the defect,
but every time I've had a print that handles this way, it's been some
'perforation related' issue.

Posted by Gordon McLeod (Member # 33) on 02-16-2014, 09:50 PM:

Usually the pad roller in a simplex 5 star soundhead causes that damage

Posted by Robert E. Allen (Member # 1351) on 02-16-2014, 10:52 PM:

Fortunately I don't have to move it, it plays through OK and I ship it out Thursday so I'll just live with it. Thanks guys.

Posted by Bernie Anderson Jr (Member # 410) on 02-18-2014, 05:26 AM:

I've had that damage from Century projectors too. If you had a bad splice go through, some times it slightly pops off the sprocket and makes a hang nail on the corner of the sprocket hole.