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Slump molds are concave forms that work just like other molds in that clay is draped over the surface of the mold. With slump molds, the inside surface of a pot is exposed, while the outer face is in contact with the mold.
What is a slump mold and how is it used?
Slump Molds – The clay “Slumps” or sags down creating a concave shape and are used when you want to add embellishments to the inside of the shape or around the lip.
What does slump mold mean in ceramics?
Slump mold definition: A typically shallow frame or mold into which a slab of clay is allowed to fall or settle in order to form a vessel. These can be frames with no bottom, as in today’s video clip. Hump mold definition: A convex form over which clay slabs are draped until stiff enough to hold the shape.
What is a clay slab drape mold?
Wood drape molds are ideal for making dinnerware and serving platters. They are cut and beveled fiberboard which make them durable and economical. Slump/Hump Molds are used to form slabs of clay into different forms. Slump/Hump Molds are heavy duty, re-usable, plastic molds for casting plaster forms.
What is the difference between a slump mold and a drape mold?
Convex plaster forms are known as “hump molds” or “drape molds”, while concave plaster forms are known as “slump molds”. The difference between a hump mold and a drape mold is the degree of slope of the shape with the drape mold having a shallower slope than hump molds.
What are the stages of greenware?
Greenware is unfired clay pottery referring to a stage of production when the clay is mostly dry (leather hard) but has not yet been fired in a kiln. Greenware may be in any of the stages of drying: wet, damp, soft leather-hard, leather-hard, stiff leather-hard, dry, and bone dry.
How do you make a plaster slump mold?
Here is a short overview of the process…. STEP 1: Selecting a Plastic Bowl to Make a Plaster Hump Mold. STEP 2: Use a Release Agent. STEP 3: Measure Out Your Water. STEP 4: Mix Your Plaster. STEP 5: After Pouring Your Mix. STEP 6: Removing Your Plaster Hump Mold. Making a Bowl with Your Plaster Hump Mold.
What clay is best for mold making?
Poly Plasticine is a non-hardening, sulfur-free modeling clay. It is non-toxic, odorless, and has a smooth, firm consistency. It’s great for sculpting, which might be what most people think of when they hear modeling clay; however, we use this clay for varied purposes in our mold shop.
How do you press mold for clay?
Just lie your rolled clay on top and let it dip down as deep as you want your finished piece to be. Make sure to line your mold form with a mold release (such as talcum powder, cornstarch, plain water, or pantyhose) so that your clay doesn’t stick to it. Then, let it dry to leather hard.
How do you mold clay?
Probably the most ancient and easy way to mold clay is by pinching it with your fingers. Once your clay has been wedged, press and pull at it with your fingers to form it into a desired shape. For instance, to shape a simple bowl using the pinch method: Take a lump of your clay and roll into a ball.
What is hump mold?
Hump molds are convex forms over which a slab of clay can be draped. The hump molds carried here at The Ceramic Shop are convex plaster forms intended for this purpose, providing a template for slab work. Hump molds are very easy to work with and provide great results — just press a slab of wet clay over the mold.
What are the 4 hand building techniques of clay?
The most common handbuilding techniques are pinch pottery, coil building, and slab building.
What is a slump Bowl?
Slump Molding Bowls, plates, and platters can easily be made by slumping a slab into an existing bowl or plate. Deep bowls will require the slab to be cut, removing excess clay, in order to form smoothly into the mold. Another method would be to piece several different slabs into the mold to complete the form.
Can you apply slip to bone dry clay?
Because the slip shrinks it will tend to flake or peel of bone dry clay. Regular slip is, therefore, best applied to soft or leather hard clay. However, you can also use a slip trailer to apply engobe. In this case, it is possible to slip trail onto bone dry clay and bisque ware too.
What are the 3 stages of greenware clay?
Greenware refers to any pottery that hasn’t been fired, and there are three stages of greenware: (1) greenware in its original, very maluable and moist stage – this is when the basic form is constructed; (2) greenware in the leather hard stage – this is when the joining of additional clay pieces are added or relief.
How long can pottery sit before firing?
When your pottery is a half-inch thick or more, three weeks should do it. If you live in a humid climate and want to air on the safe side go for four. When crafting a larger or more complicated piece like a girl on a bird, it’s worth taking extra time to make sure your pottery is totally dry.
What clay is used for sculptures?
Coarse clay is a better choice for hand-building and sculpting as the clay holds its shape better and reduces shrinkage, reducing cracking or warping. For wheel throwing, coarse or grainy clay can cause hand abrasion, so ultra-fine or no-grain clay is the best option. A fine smooth clay also gives a more matte finish.
How thick should a clay slab be?
You want your slab to be no less than a 1⁄4 inch (6.4 mm) thick so that it is sturdy enough to use without breaking. If your rolling pin is too thin, you may end up with ridges in the middle of the clay. It should be wide enough to fit across the entire slab of clay.
What are the 6 stages of clay?
There are 6 essential stages of clay: 1. ) Slip. Slip is clay with added water to make it into a paste or liquid. 2.) Wet clay. Wet clay is used by many potters to produce their work. 3.) Leather-hard clay. 4.) Dry clay. 5.) Bisque. 6.) Glaze ware.
What is a slab of clay?
SLAB – Clay which has been made flat by rolling. SLAB CONSTRUCTION – Handbuilding technique in which flat pieces of clay are joined (clay is flattened and thinned with rolling pin or slab roller) SLIP – A liquid form of clay used as a glue or as decoration.
What are glass slump molds made of?
Select your molds based on the project you are slumping. You can select a mold for a platter or bowl, or choose a mold based on a texture that you want to achieve. Molds are made out of materials that can withstand high firing temperatures in the kiln. Most molds are made of ceramic clay or stainless steel.
