Dough Moulding

glad its not a bakery type of dough......it may be hard to get a response with the information you have.

Such as end use, strength requirements.....

well!! I think dough can be made by a cutting revolving rod and the sending the material in a machine something like a system for sugarcane juice. any way i am looking for a mechanism so that it may make a round ball pieces of dough.

how big a ball, and the accuracy

Bakeries form bread loaves by cutting the dough to the desired size/weight and sending the cutting on a conveyor belt that has a stationary panel above it. Adjusting the distance between the belt and panel controls the length and diameter of the loaf. To form a more spherical shape might require guide rollers that form the conveyor into a bowl shape, shortening the loaf into more of a ball shape.

thats one way.......frankly I don't think one can help him until he actually defines his needs......and not the final line of his list of needs

"I am using polyester resin, catalyst, calcium carbonate, and glass fibers(chopped)"

What is the ratio presently in use to make these "dough balls"? What is it? And what is a dough ball?

We don't read minds.

Seriously.

What are you fabricating. What are your finished specs. You specify "dough" which yields no edible bread. You're making some sort of fiberglass "thing" - Are you looking for tensile strength? Temperature stability? Cheapness?

We'd love to help, but you give us no handle on the problem. I realize that there may be IP issues, but a hint would help.

Some ignoramuses seem to be treating this as a joke!

Strength will depend upon the glass to resin ratio same as for lay-up. Use extenders/fillers such as calcium carbonate with discretion- use as little as possible. It will be a question of suck it and see (experiment to get the best result). Remember that the weak point is the poor adhesion of polyester to glass

Joke.....the point is, there is no structure of intent....you can throw out what you want because no one has an answer for.

And you can flex your knowledge of FRP lay ups to the OP. But the quick answer to match the question is simply, try it and see.

As you point out the weak point is the poor adhesion of polyester to glass. Glass fibers can be sized (surface -treated) to promote adhesion. Silane coupling agents are often used. You want to use something with a silane on one end to react with the glass fiber surface, and something similar to your polyester on the other. Pigments like CaCO3 can also be surface-treated to improve compatibilityand wet out better. These agents treat the surface, so a little bit goes a long way. Ask your CaCO3 supplier about surface-treated pigment, and your glass fiber supplier about silane-treated fibers.

This blog is pointless, too little pertinent information and ignoramus guests, byeeeeee......

Hey!!!!!!!!!! Wait for me

Hey - Pay Attention - Not enough information to formulate a reasonable response.

If you want help from this forum state the application, the operating requirements and in this case current ratios. And that is just the start of a list that should include type of equipment, moulding process, pressures etc etc.

I have a very little experience molding polyester for cabnet tops and the like. First are you using a laminating or casting polyester styrene? For an actual casting of a solid object a casting resin would work best. Catalysts are most often blends of organic peroxides like methyl ethyl ketone peroxide (MEKPO). There are often organic metal promtoters added like cobalt napthenate. NEVER mix catalyst and metal promoters directly together, blend in the metal first, then add the MEKPO. Calcium carbonate (limestone) should be OK for some things, consider Aluminum Tri Hydrate (ATH) as a filler. It is a bit more expensive but gives a great cast surface and adds fire retardancy.

Hope this helps a little more than the rather stupid humour from other posters.

Quote: Hope this helps a little more than the rather stupid humour from other posters.

No it does not help. You don't know what the OP is doing because it has not been stated. So everything else is an ASS-U-ME-tion. [Please excuse the misspelling in order to achieve a little grammatical humor.] So it is a joke until the OP decides to respond with a sensible description of the intended use and application.