dangerous popsicle: two-part silicone casting
Have you ever licked a cactus? Probably not.
But it can be interesting to try in another form.
It\'s time to create some special feel for our tongue!
I will make a cactus in this instruction
Two inspired popsicles and demos-
Some silicone casting process.
Below is the Instructure that introduces the basics of mold making. Making a two-
Parts and molds are widely used and friendly to beginners.
I used one here-part and two-part mold-
I simulated the shape of the cactus with the rhino and exported it.
Stl file and print it out on Objet 3d printer.
If you do not have access to a 3d printer, you can always use online 3d printing services such as shapes and implementation.
As you can see, the model is very symmetrical and clear before and after (
Where are the spikes). So for our two-
The part mold parting line will be the center line between the front and back.
If you\'re using more complex geometry, try marking your parting lines so you can avoid subtle details.
Note that the parting line does not need to be on the plane. a. SiliconeSmooth-
On offers a variety of silicone products, but there are three types for food safety applications: smooth-
Sil®940, Solta Qing®Series and spring equinox®Series.
Only Sorta is clear among the three. ®Series translucent (
As its name suggests, it\'s a bit clear)
, This is very helpful when model visibility is important.
Here I am using Sorta Clear 40 which is the most difficult one in Sorta Clear®Series. The mix of A (yellow bucket)and B (blue bottle)
The weight is 100:10.
You need a digital scale with at least one digit after zero. b.
Mixing tools sprep is a number of mixing tools including paper/plastic cups and mixing sticks (
I use a disposable spoon).
Even if you know you will mix a lot of material, it is better to produce it in small batches.
This is to ensure full mixing and easy handling. c.
Food grade silicon mold release agent and corn starch were prepared at the same time.
Unfortunately, they all failed.
Well, this is not the end of the world)
But I recommend Vaseline and wax.
Release based on mold. d.
In the production of silicone molds, the most commonly used is the molding clay.
I used the white sculpey.
It is more expensive than Plasticine, but the food is safe.
Please note that food safety is not important here as Clay will only have a short contact with your silicone mold and you can clean your silicone mold at any time after that.
No matter what Clay you use, it needs to be oilbased non-sulfur clay (
Reaction of sulfur with silicone). e.
The vacuum chamber is used to remove air from high viscosity materials like our Sorta Clear 40 silicone, so that we can get casting without bubbles. f.
The protection of silicone may be confusing.
Wear gloves and protect your working surface with butcher paper.
Brush a little corn starch on the original surface first so that it will not stick to the clay. (
Corn starch and spray
On the silicone mold release agent, both products can be used for this purpose)
Plan your mouth (
Where you will pour your actual casting material into the mold)beforehand.
This is at the bottom of the original.
You can use a small piece of sculpey (
Soft or hardened)
And stick to the original bottom.
Prepare the mold box (
No fancy, this is the laser-
Cutting pressure plate).
Start laying clay at the bottom of the box, place the original in, fix the clay for dumping, then continue to lay down the clay until there is a smooth surface along the parting line.
Finally, the mold release is applied.
To ensure the perfect alignment of the two parts of the silicone mold, we will make some registration keys.
There are many different ways to do this.
You can use a stick to make some holes in the clay, or draw a sunken line around the original, or embed some metal pins in the clay.
Be sure to stir in batches to ensure thorough stirring.
Silicone will not be able to cure without proper mixing, which wastes your materials and precious time.
I made 4 small batches at the same time here.
Here is a very important thing to make sure that your silicone mixture is not 1/3 above the height of the mixing cup.
This is because the silicone mixture will rise very quickly during the degassing process, and if you don\'t leave enough space for it, the silicone will come out of the mixing cup.
All the mixing cups with silicone (mixed already)
Enter the vacuum chamber.
Start the pump and you will see a lot of bubbles popping up on the surface of the silicone mixture.
Continue to observe the bubbles: they rise to a very high point and start to drop very slowly.
When the bubbles become larger and the height does not change anymore, this means that the degassing is successful.
Please note that at this point you can still see a lot of bubbles and slow breathing movement from the silicone mixture.
Slowly open the vent on the vacuum chamber.
You will see that the bubbles gradually disappear and eventually the silicone mixture is clear and there are no visible bubbles.
Otherwise, put them back and continue the degassing.
Now we\'re going to pour the silicone!
Tilt your mixing cup and let the silicone flow down.
Don\'t rush to the process, and don\'t stir violently, because you will create bubbles in the silicone again.
Pour into a corner of the casting box and let the silicone flow naturally to the rest of the mold box.
This is also to avoid adding more bubbles to the silicone.
For the last little silicone left in the mixing cup, you can take it out with a stick or spoon as your shovel moves and you will find more bubbles coming in.
Put the mold box back in the vacuum chamber to remove the new bubbles.
In the end, you should see a very consistent, clear and bubble --
Free silicone mixture in your mold box.
Please note that it doesn\'t matter if you still have some small bubbles in the end.
These 10% small bubbles magically disappear during curing.
Sorta removes 40 silica gel curing materials within 16 hours at room temperature.
However, if you have a kiln/oven, you can cure silicone faster at low heat (150 degress F).
After curing the first half of the mold, remove the mold box and clean the clay from the silicone.
Please make sure you do not move your original in the process.
Put the first half of the original mold back into the mold box, and then apply the mold release.
Mix, Degas and pour the second half of the silicone into the mold box.
Repeat the process at the last step.
When the second half is cured, remove the mold box and you should be able to take out a two-
Silicone mold perfectly aligned by registration key.
However, if your mold release fails (
Happened to me)
Because the two parts stick to each other, you end up with a large piece of silicone.
It\'s not ideal, but it\'s not the end of the world.
You can still open your \"one-
Parts \"open the mold carefully with a scalpel (
You need another person to help keep your mold still and separate the mold along the cutting line).
Make sure the cutting line follows where you want the part mold to be and try not to cut straight all the way.
The curved parting face will help to better align the two mold parts.
Now we finally have two.
Prepare the silicone mold.
It\'s time to put some popsicles!
Clean the mold thoroughly and dry it with a paper towel.
Align the two parts and apply some pressure on your hands to stick them together.
Fix the mold with rubber bands.
Mix any recipe of the popsicle you want, but the low sugar and high moisture content works better in keeping the details (spikes)in this case.
Tap the mold during and after pouring and make sure there are no bubbles in the spike.
Here you will see the benefits of translucent molds as you will see clearly where the bubbles are.
I cut a small piece of acrylic with a laser and fixed the popsicle in place.
Put the whole thing in the fridge and after 24 hours the pointed cactus popsicle is ready!
Now we have the dangerous tip popsicles that are delicious!
Of course, you can be creative about shape and taste.
I actually did two dangerous popsicles, the cactus family and the virus family.
Do you want an HIV popsicle?