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 What is MOLDING? (Not biology).  What is Casting?

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Presentation on theme: " What is MOLDING? (Not biology).  What is Casting?"— Presentation transcript:

1  What is MOLDING? (Not biology)

2  What is Casting?

3  What is the difference between Molding & Casting?

4  What is Henna?

5  When creating a mold – does it (the mold) create the positive of the object or the negative?

6  When creating a mold – does it (the mold) create the SAME image or a reverse image?

7  What is a reinforcing coil? A small coil used to make the seam between joined pieces stronger. (aka reinforce them)

8  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.

9 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.

10  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

11  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.

12  Created in 2, 3, 4+ pieces for easy removal.  Reusable.  Out-dated in comparison to newer flexible molds – but still reliable.

13  Made for a one-time use and thrown away after.

14  Used for ceramic purposes.  The mold can be made of plaster or found objects and clay can be pressed firmly into the mold.


16  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.

17  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.

18  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

19 Casting – The process of filling a mold with liquid that will then harden.

20  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

21 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.

22 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.

23  A solid mass casting can be cast with or without reinforcement.

24  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.

25  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.

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