/ Boot oven temperature?
Can any ski techs / boot fitters out there what temperature you set your oven for softening plastic boots for modification.
My knowledge is nearly 10 years out of date, and I need to do some DIY...
boots or thermofit inners ?
Sorry I wasn’t very clear was I... the boots themselves. I’d consider a heat gun normally, but looking for a more general and less aggressive solution.
I'd be very wary about putting the whole boot in an oven as there are typically a bunch of glues used which might not take well to being heated to the temperature needed to manipulate the shell.
Yeah, your probably right. Although I’m pretty sure there is no glue on my boot shells... plastic welds maybe, but not glue.
I seem to rememer having some success back in the day with boiling water. I’ll maybe try that.
Don't know about using an oven...sounds dodgy, though.
(Disclaimer...certainly no expert!) I've had a lot of success using a heat gun and digital laser thermometer off Amazon for 30-odd pounds...the critical temperature I use is 160°C. I heated the plastic slowly inside (if possible) and out...this is important (a production manager in a skiboot factory told me). Inside and outside makes sense, otherwise you're setting up some sort of distortion in the plastic I guess. Why it's better to do it slowly I don't know...same sort of reason I guess. I heated to 170°C once and the plastic starts to bubble, but certainly in my experience that's just proved to be cosmetic and hasn't led to anything catastrophic happening. I fashioned a "punch" by using bits of 1" x 1" wooden cubes, drilled to take a length of threaded bar in the middle that I can adjust with a nut. (If you manage to come up with a better solution do please share!) If you want, I could stick a photo on my album, I guess.
I play around with the "punch" until I get the right length, then heat the plastic. As soon as it hits 160° I stick on a glove and ram in the punch, then hold it in place and wait for the temperature to drop below around 50°C (again, slowly).
Also, my boots are Pebax/Grilamid, which apparently has more "memory" than standard PU, meaning it tends to want to return to its original shape. (Plus I think the same thing happens to the liners) This I can confirm because it does seem that every year I have to redo them, but now I've got my routine down, it's literally a 30 minute job.
I combine this with thermoforming my liners by putting them in an enclosed space (I used a box) and heating them thoroughly inside and out with a bog standard hairdryer. Before doing this I prepare my feet by sticking a foam patch onto the pressure point I'm trying to sort out. I've been lucky because my problem has been my ankle bones and a bit of width around my little toes, which with my boots I can access easily to get a good "punch" from the inside.
Before doing this my boots were basically unusable. Now I can ski tour all day with nary a twinge.
I’d pay a boot fitter to do it
I am one (or was one) just couldn’t remember the temp of the oven I had in the workshop.
Thanks for the insite anyway though!
Good post, cheers!
The boiling water method has worked for me, although time will tell on the hill... if it’s not enough though I’ll give you method a go. (I do wish I had my old workshop tools though...)
I did read somewhere that heating up a linen bag of un cooked rice in an oven then stuffing it into a boot shell works?
Correction, this method seems to be more for pre-heating thermofit liners rather than shells
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