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Soap Making Forum > The Soap Making & Craft Forum > Labels and Packaging > Packaging Warping
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Old 02-17-2017, 05:43 PM   #1
nyrajaid
 
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Default Packaging Warping

Hello. I was hoping I could get some troubleshooting/advice from you guys. I purchased some plastic cosmetic tubs from Bulk Apothecary to use with my shave croap. The problem I am having is when I fill the jars about half of the time they warp in the middle giving them an hourglass like shape.

Obviously this is not ideal for several reasons. Mostly though, I think it makes my product look unprofessional. It also makes my labels not stick as well.

Any ideas on why this is happening and what I can do to prevent it? I suspect it is just the quality of the plastic does not hold up to the temperature of the croap. I think ultimately I need to switch to tins instead. Has anyone had this happen with another type of packaging?


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Old 02-17-2017, 05:54 PM   #2
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Are you filling them too hot? That's the only think I can think of that may cause them to warp. Melting the jar? I package mine in jars with no issues but I don't put it in the container until it's cooled down some.


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Old 02-17-2017, 06:17 PM   #3
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I have used Bulk Apothecary's shrink wrap bands on PET containers without a problem. I have tried to clean out a used one with boiling water and they all shrank into hour glass shapes. I suspect you're getting your heat gun too close to the body of the container (rather than around the screw-on cap, which will withstand the shrink wrap heat).
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Old 02-17-2017, 07:47 PM   #4
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I think I am filling them when they are too hot. The problem is when I let them cool a bit the consistency makes it too hard to fill the tubs. There is a very narrow sweet spot for the right temps.
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Old 02-17-2017, 08:37 PM   #5
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I don't know if this will work or not (i.e., I've never tried it before), but what if you were to freeze or refrigerate your empty tubs so that they are good and cold before pouring the hot soap into them? At least that's what I would try.


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Old 02-21-2017, 01:23 PM   #6
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What about using a rubber band wrapped around the middle (so it wraps partly over the top)? Just pour right over it. I would think that might create just enough tension to keep the walls from bowing out. If you can't quite imagine what I mean, I can take a pic to show you.
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Old 02-21-2017, 02:47 PM   #7
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Maybe putting them in the fridge immediately after pouring would help too!


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