Here are the responses that I received from the list. I had not had the
honors of trying of these methods but I hope to start here in the near
future. I have a few ideas of my own that I hope to try. Once I have had
an opportunity to try and perfect my own system I will post them.
My original posting;
Has anyone had any success in pulling plastic over foam AFO molds? If
you are one of those that have tried, what are the methods that you have
tried and what kind of results to you get?
Responses;
1. Use stretch nylon from rx textiles, 2 layers inside out, also
take a piece of 2″ cotton stockinet stapled onto the anterior from your
vacuum source to the end of the toe (this will act as a wick ), and
finally wet the entire model before forming. Chris Cummings
[[email protected]]
2. Use a thin nylon stockinet, dampen. Make a fine slurry of
plaster and apply with hands (dipping never worked for me). Frankie Berg
[[email protected]]
3. We form thermoplastics over 10 cubic foot pound foam FO positives
on a regular basis. This will work on an AFO positive but you will have
the challenge of not having your cast distort when it is poured up with
the expanding foam. There are also release issues from your negative.
Try plastering modifications over the foamed up AFO or pulling a PVA as
described in my previous message. If you wish, you can contact us
directly at the phone number below. Patrick Myrdal, RTPO(c), FCBC
Phone: (204) 475-3799 – Fax: (204) 775-2252
4. Seal it with fast curing resin, ‘wash” it. siegelhartz or
similar. 2 prs of gloves, pour some resin into the palm, and spread it
all over. Easy on promoter, or layer will crack from heat. You can
paste it with lite putty, let it dry, and then smooth with sanding
screen. You can make your own lite putty by pre-mixing, in an empty
coffee can, resin with solcaflok. All you need is to later add promoter.
It can stay in that form for long time before it goes bad. Much cheaper
than buying OB or other lite putty stuff. I. Lesko, LPO Ingvar
Leskovar [[email protected]]
5. I have pulled a layer of stockinet and then a nylon over the
mold. You then either dip the whole thing in water or use a spray
bottle. The trick is to have enough moisture to prevent the
plastic from sticking to the mold, but not so much as to cause steam
bubbles. Please post your responses.
There has to be a better way. Dan Munoz [[email protected]]
6. We have been forming LDPE, LLDPE, COPP, PE foam and HPP over
Polyurethane foam since 1990. In order to fabricate consistent Ps & Os
it requires the CONSISTENT following:
Oven (uniform controlled heat)
Fractional melt index plastic
Heat resistant proper density foam
None stick 2 layer very wet fine weave stockinet
Mold preparation
Instant vacuum
Technique
If you require additional information please give call me. Alan R.
Finnieston, CPO, LPO Alan Finnieston [[email protected]]
7. I am working on process instructions for pulling CP and PP
over foam models. The currently method used is to pull 1/16″ PE pulled
over model then a fab nylon as separator. We have tried plaster slurry
but the results have not been as consistent. I have also seen liquid
silicone used on nylon as separator but I’m hesitant due to cost and
handling. If you get any other responses please pass them along. If you
have any questions or suggestions please contact me. Chris Casteel, RTO
Chris Casteel [[email protected]]
8. Pulling Plastic over Carved Foam AFOs Models
Dave Funk – 517-783-1313 per phone conversation
1. Use Electrical Conduit pipe to hold the AFO cast. Flatten the end
then split the end into a fork. Hammer this into the cast to hold it for
vacuuming.
2. That some stockinet and sew up the end, than soak in water. Once
soaked pull over the cast.
3. Apply 4 layers of nylon hose. If putting joints on then apply
these, then cover with another layer of nylon.
4. Use a spray bottle and spray water onto the set up until it is
just dripping water.
5. Put plastic into the oven
6. Than pull plastic
7. Caution not to use to much water.
Scot Sepe CPO
Chief Prothetist-Orthotist
Arkansas Children’s Hospital
800 Marshall Street, Slot 104
Little Rock, AR 72202
(501) 364-1192; FAX (501)364-3564
501-364-2262
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