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Mono Filament Nylon Thread Explodes Bobbins

So I’m doing some custom sewing and decided to use that mono filament clear nylon thread in the bobbin of my sewing machine. I’m winding the bobbin full of this thread and, suddenly, at about 1/2 full, the top of the plastic bobbin “explodes” off the shaft of the bobbin. I had to use my trusty needlenose pliers to pull the rest of the bobbin off of the bobbin winding spool pin. Of course, with one side missing from the bobbin, the nylon thread that was wound on the bobbin spilled off the center pin and unwound and tangled immediately. I had to discard the whole shebang.

Thinking that the bobbin was somehow inferior, I found a more “sturdy” looking empty bobbin and began again.

AGAIN, the bobbin wound about 1/2 full then exploded!

I came to the conclusion that you can’t wind plastic bobbins more than about 1/2 full on a bobbin winder because it winds too tightly and the bobbin won’t survive. I expect this would not happen with metal bobbins, however, if you try to wind this type of thread around a plastic bobbin, use care. Or wear your safety glasses!!

PS. After doing some more reading and research, I’ve learned that these bobbins exploded because the mono filament thread stretches when wound using the bobbin thread tension disc and the building pressure on the shaft of a plastic bobbin eventually pops the top of the bobbin off. They recommend not using the bobbin thread tension disc when winding bobbins with this type of thread. Instead, you should just wind the bobbin slowly, using your hand to put the minimum tension possible on the thread as it winds onto the bobbin. Be careful that the thread doesn’t cut into your flesh as you wind (another reason to wind slowly)!

While you could wind the bobbin with mono filament thread entirely by hand, it can still be done by machine. The thread goes from the spool, around your hand, to the bobbin on the bobbin winding shaft. Skip the bobbin winding tension disc. Use your hand to guide the thread up and down so it winds evenly onto the bobbin, putting only minimum tension on it.

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