When creating a mold – does it (the mold) create the positive of the object or the negative?
When creating a mold – does it (the mold) create the SAME image or a reverse image?
What is a reinforcing coil? A small coil used to make the seam between joined pieces stronger. (aka reinforce them)
COPY. Process of Creating a Plaster Cast Tile 1.Create a slab & reinforcing coils in container. 2.Use round yellow sponge to smooth out slab & coils – to create an even texture. 3.Pick out plants/nature and push into clay careful not to put fingerprints. 4.Carefully remove plants – leave NO nature! 5.Add water to plaster –mix – pour into mold. DO NOT go past the rim created by the coils! 6.Allow to dry.
Molding – The process of creating sculpture by substituting one substance for another. Casting – The process of filling a mold with liquid that will then harden.
A hollow, negative (reverse) forms into which a malleable or liquid substance is pressed or poured. FIVE different types of Molds: 1. Hard Molds 2. Piece Molds 3. Press Molds 4. Flexible Molds 5. Life Molds
Hard molds are usually made of plaster, but they can also be made of other rigid materials including fiberglass, metal, epoxy, and even wood. Major types of Hard Molds: 1. Piece Molds – Reusable in pieces. 2. Waste Molds – To be thrown away. 3. Press (Slump) Molds – Reusable by pressing material into mold. Hump (Drape) Molds – Reusable by draping material over a mold.
Created in 2, 3, 4+ pieces for easy removal. Reusable. Out-dated in comparison to newer flexible molds – but still reliable.
Made for a one-time use and thrown away after.
Used for ceramic purposes. The mold can be made of plaster or found objects and clay can be pressed firmly into the mold.
Flexible molds are used because of their easy removal from the cast object. Flexible molds materials include polyurethanes, latex and silicones. There are TWO basic methods to applying flexible material. 1. Brush-On More frequently used – better on larger models. 2. Pour-On Pouring over model or submerging into a prepared container.
Creating a mold from a live model. Possible materials used: plaster gauze, alginate, and liquid plaster. Alginate: A expensive molding material primarily used for dental molding, but also used for human body moldings because of its quick-drying capability and flexibility.
There are NINE considerations: 1. Draft 2. Undercuts 3. Parting Line 4. Shims 5. Keys 6. Pouring Duct 7. Mold Bindings 8. Withdrawal Angle 9. Release Agent
Casting – The process of filling a mold with liquid that will then harden.
Plaster - fast-drying inexpensive material used for indoor sculptures. Cement - a long- lasting slow-drying building material used for outdoors. Metals – bronze, gold, silver, etc. Wax
1. Liquid stage – Just mixed. 2. Putty stage – Best for spreading, brushing on & laying up hollow casts. 3. Rigid stage– Beginning to set. 4. Set stage – Heat activated. 5. Cure stage – Best for carving. 6. Dry stage – Best for paint.
1. Solid Mass Can be cast with or without reinforcements. 2. Hollow Mass Can be slushed* or laid-up by hand. *Slushed – A process of creating a casting by pouring a liquid substance into the prepared mold. The purpose is to create a lighter mold.
A solid mass casting can be cast with or without reinforcement.
A slush mold casting is a a hollow casting. It is created by pouring a liquid casting substance into the mold allowing it to partially set, and then drawing in the surplus.
A laid-up mold casting is also a hollow casting, but created by adding casting material directly by hand or by brush to the interior mold surface.