TPE release from mold
- BigBurrito
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TPE release from mold
Re: TPE release from mold
LOL Great minds think alike. I'm awaiting my new "labia" façade mold to dry and then onto pouring. From what I've read. Prep the mold with high temp engine paint which will seal the plaster and add a level of heat protection for it. I was going to add a mineral oil coating inside the mold and pour. TPE's around 400F which the plaster should hold if there's no air bubbles in it and it's dry. Mold should be preheated to 150F. Anything above and you'll get spalding (mold face crumbles) but if you pour cold it might set the tpe to fast in mold contact areas and the insides could warp or so I've gleamed from reading misc posts and molten plastic molding techniques on special effect sites.BigBurrito wrote:Can anybody give me a suggestion of a good release agent for molding TPE in a Plaster of Paris mold
Be nice to hear from anyone who's done it and the results, prep etc.... Obviously there's a few of us out here working on mods or replacement parts.
Re: TPE release from mold
- Fantastic Plastic
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Re: TPE release from mold
A release agent may be as simple as a mixture of talcum in an alcohol carrier sprayed on the inside of the mold with just a cap full of mineral oil to help hold it in place.
Just a thought. Or this stuff?
Re: TPE release from mold
Thank you FP. I've heard wd40 and few other suggestions but was only guessing on the mineral oil figuring it was already a component of tpe and couldn't hurt it. I like the talc powder idea since I also use that for making plaster molds to eliminate air bubbles. May do the same with tpe. Guess I'll do some trial and no doubt lots of errors. LOLFantastic Plastic wrote:It’s usually a fiberglass mold with a resin sealer inside.
A release agent may be as simple as a mixture of talcum in an alcohol carrier sprayed on the inside of the mold with just a cap full of mineral oil to help hold it in place.
Just a thought. Or this stuff?
- Fantastic Plastic
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Re: TPE release from mold
You can write down exactly what TO do, and it would just be a pamphlet.
Write down what NOT to do? You’ll have a set of encyclopedias!
Re: TPE release from mold
Thanks. It's working with a hot media that's throwing me some curves. I've made molds out of most available products. I've poured clay(slip), cement, silicone, plaster, latex. But all of those are cold pour products.Fantastic Plastic wrote:You’ve got the right mindset Rick! Your going to make mistakes, actually you want to count on it!
You can write down exactly what TO do, and it would just be a pamphlet.
Write down what NOT to do? You’ll have a set of encyclopedias!
I've heated plaster molds up for various reasons and if they're wet or have an air pocket. Ya can end up with a pretty impressive "boom" and shrapnel. I've cracked molds just pouring plaster in plaster since plaster gets pretty hot as it cures.
I may say screw it and learn Fglassing just for the safety aspects.
So far all of my projects are small. Adding a more detailed labia façade to a doll. New boobies (small cup) on a "small breasted" doll which is actually flatter than a board. Should have been a "no breast" doll. That's my largest mold at around 3" dia and 2.5" h. But even small I don't want a 300 to 400F material getting loose.
The titties I may attempt a direct pour right onto her body to see if it's possible and how well the bond is compared to all the "glues" available that don't seem to "glue" so well. Indigo's Cold Weld would be a life/time saver but I guess there's issues with it or I'd be buying by the gallon. LOL
My mistakes encyclopedia will be more volumes than Brittania's.
- Fantastic Plastic
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Re: TPE release from mold
- BigBurrito
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Re: TPE release from mold
- BigBurrito
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Re: TPE release from mold
Re: TPE release from mold
BB Ya just gave me an interesting idea for the labia facia I'm going for. So you have the neg. You'll fill that then press the positive in to force or compress the tpe into details and cavities? What am I missing besides having to be damn careful about molten tpe being forced out along the mold edges? LOLBigBurrito wrote:Thanks guys for the ideas, i have a face mask neg mold and a face interior insert that drops in the face mold with alignment rods quickly after the TPE is poured, so the eye lids and mouth thickness is consistent, as the lip interior. Thinking that i brush on liquid latex on the mold insert to seal the plaster, then using mineral oil/ talcum pdr for a release formula
- BigBurrito
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Re: TPE release from mold
Re: TPE release from mold
Looks like it may work. Have a way to weigh down the positive until you get the thickness you want and a way to lock it into place during curing. I'm thinking like an apple press type thing with woodworkers clamps. I don't think you'll just be able to press it in and let go. Gravity will be working against you. But I'll be damned if that doesn't look like a good way to get an easy fill and a way to force the material where you want it and control the thickness.
I may rethink how I pour the labia I'm working on. A pressure fit would definitely guarantee details, nooks and crannies filled. Another benefit is it may also press out more if not all air bubbles. That's why dolls are pressure injected molds. Get to the toes and get rid of air.
- BigBurrito
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Re: TPE release from mold
Re: TPE release from mold
Okay I can picture what you mean and that explains why the eyes already have holes in 'em. LOL Pressure cooker set up sounds like an interesting idea. I'd say worth it for lots of molding but I think the press fitted halves might work out as an easier set up. Especially using the eyes and mouth as depth gauges and mold seats. Fill, press together, avoid hot tpe shooting out the sides and ya done.BigBurrito wrote:I have 1/8th inch rods that index trough the eyes and both the face and inside mold to index in alignment. The eye's and the mouth bridge hold the thickness sense both molds make contact in those areas, voiding those areas of TPE, so little trimming needed in the post mold process. Hope that explains what you are after. BTW, i have a pressure cooker that i may convert to a TPE pressure injector, by having a tap and air fitting to force controlled air pressure to the chamber, and a pickup tube going from the bottom to a fitting on top that connects to the mold, just an idea anyway, and having experience in metal fab like building choppers in my past, and another one this spring
And kool doin' the chopper thing. I'm not much of a fabricator and no longer ride do to bad knees. Looked at those cam am things and trikes but none seem to grab my attention. Bitch gettin' old. LOL
Good luck on the project and keep us posted