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 Post subject: Stiffener
PostPosted: Wed Oct 14, 2015 7:56 pm 
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What do you guys use when you want to stiffen your item? I see three main options, depending on the context:

- Stiffer material (ex: 1000D over 330D, webbing, etc)
- Plastic sheets (HDPE?)
- Sticks (not sure what material they are... but for reference, something along the lines of the frame in Mystery Ranch Rip-Zip pockets)

For bigger things (packs) there could be aluminium as well

My current use-case seems more appropriate for "sticks", but I haven't found the proper material.

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 Post subject: Re: Stiffener
PostPosted: Thu Oct 15, 2015 5:26 am 
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I would mainly use HDPE, or techincally a polypropylene sheet.
Foam is also good to add some structure but to make it as stiff.

I have no idea what you mean by sticks, and no idea what you are looking to do so it's hard to give you any advice. Seriously though, you could use whatever fits. Even if the material isn't sew-able..

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 Post subject: Re: Stiffener
PostPosted: Thu Oct 15, 2015 6:07 am 
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Well the question is meant to be generic, but in the specific case I'm working on, I want the sides to keep their shape and flex a bit but allow the body to bulge out (to the extent the fabric will allow), and ideally have something lightweight-ish.
So a solid HDPE panel doesn't work, and I tried just a HDPE "frame" (cutting out the center) and found it not stiff enough.

As an exemple, the MR Rip-Zip (I'd rather not damage it to find out :lol: )
Image

But writing this made me think of fiberglass, as in fishing rods... which lead me to
http://www.ebay.com/itm/20pcs-3mm-diame ... 487caba353
I'll swing by my local RC shop to see if I can find some of that.

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 Post subject: Re: Stiffener
PostPosted: Thu Oct 15, 2015 7:23 am 
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It could also be plastic tubes.

Also alu strips are really common in backpacks.

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 Post subject: Re: Stiffener
PostPosted: Thu Oct 15, 2015 8:18 am 
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My kelty backpacks have both alluminium strips, they're inside a channel, at the back of the pack, they can be bended to adapt to the shape of the shoulder.


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 Post subject: Re: Stiffener
PostPosted: Thu Oct 15, 2015 10:57 pm 
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Call or write MR to ask?


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 Post subject: Re: Stiffener
PostPosted: Fri Oct 16, 2015 4:34 am 
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@Essal: everything plastic that I found was either too flexible (in decent diameters) or too large.

I swung by the RC place after work and they did not have the fiberglass ones in stock... however they did have aluminium rods which, at 2mm diameter, are small enough to be attached with 3/4 binding tape and provide the stiffness I was looking for while being quite lightweight.

Alu strips do seem like a good idea for packs.

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 Post subject: Re: Stiffener
PostPosted: Fri Oct 16, 2015 6:24 am 
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Racoon1290 wrote:
Call or write MR to ask?
You'd probably have to word yourself right (ie allergy reason to ask or something like that) as most companies don't list or talk about their sources.
A few guys from DIY Tactical back in the day went to SOFIC and got a lot of shit from bigger established companies since they (DIY) were basically telling everyone how easy it was to sew and how easy it was to get supplies. It's still like that.

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