How to make a plaster mold for clay

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how to make a plaster mold for slip casting

Slip casting might be the preferred method to make ceramic wall items, particularly if the items are made up of repeating kinds. In the event you’ve been questioning the right way to make a plaster mould for slip casting, right now’s publish is for you.

On this excerpt from the Ceramics Month-to-month archive, Jackie Head takes you thru the plaster mould making course of from making a prototype to pouring the plaster mould. So take a look and cross “discover ways to make a plaster mould for slip casting” off your to-do record! -Jennifer Poellot Harnetty, editor.

Studying: The best way to make a plaster mould for clay

PS. To be taught extra about Jackie’s ending and set up course of, and to see extra photos of her work, see the March 2019 concern of Ceramics Month-to-month!

The best way to Make a Plaster Mould for Slip Casting – Half 1: Prototypes

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The tile outlines are enlarged by 10% to accommodate the shrinkage that happens when the porcelain clay physique is fired to cone 6. I print out the define of the prototype shapes, minimize them out, and hint them onto laminate boards. Separate prototypes of the back and front halves of every of the shapes are sculpted out of strong clay utilizing a clay physique with no grog to realize a clean floor. Moist clay is roughly packed onto the boards within the approximate form and desired depth of the tile prototypes. After drying for a number of hours, the clay begins to stiffen, then I carve the prototypes right into a extra outlined form (1). As soon as the prototypes attain the start phases of leather-based exhausting, I refine the shapes utilizing serrated loop instruments and varied ribs to realize their closing kinds whereas demonstrating there are not any undercuts on the prototype (2).

In preparation for creating the molds of the entrance half of every form, the prototypes are refined a closing time. To perform this, a delicate paintbrush dipped in water is used to take away any imperfections, and a versatile rib is used to create a clean floor and reinforce any sharp angles.

1 After allowing the prototype to dry for several hours, carve the clay into more refined forms.

2 Once the clay is leather hard, fine tune the prototypes further using serrated loop tools and ribs. 3 Use aluminum flashing to contain the plaster once it is poured onto the prototype.

The best way to Make a Plaster Mould for Slip Casting – Half 2: Creating the Molds

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Wrap aluminum flashing across the prototype to function cottle boards, leaving a 1½-2-inch hole between the flashing and the sting of the clay kind. The flashing creates a barrier to include the plaster as soon as it’s poured onto the prototype (3). As soon as the bottom of the flashing is sealed with a coil of moist clay, plaster is poured in till the depth of plaster surrounding the prototype is 1½-2 inches.

As soon as the plaster units up, the following step is to create the again half. Making a again to the tile lifts the shape from the wall seemingly, and makes it extra dimensional and interactive for the viewer. To start this course of, create registration keys within the first half of the mould. Use a wire device to fastidiously launch the again of the prototype form from the laminate board. Place it on prime of the plaster mould in order that it strains up with the strong clay kind that’s nonetheless within the mould. This step requires persistence and a focus to element. You will need to be sure that the entrance of the tile and the again of the tile line up completely. To do that, use a metallic rib and shave the perimeters of the again half of the tile down little by little, simply till the sting of the clay from the entrance tile part turns into seen. Add clay as wanted to create a seamless connection, after which refine the again half of the tile (4).

4 Fill in the negative space in the first mold part with clay.  Place the back of the prototype onto the first mold part.  Add or remove clay to create a seamless connection with the front of the prototype in the first mold part.

5 Place a PVC pipe in the back of the tile form to create a pour hole.  Use aluminum flashing to contain the plaster when pouring it onto the first mold part. 6 First and second mold parts created for the tile.

Earlier than wrapping the aluminum flashing across the first plaster mould part to pour the second a part of the mould, apply a number of coats of Murphy Oil Cleaning soap to the floor of the plaster. Be sure that all extra cleaning soap is eliminated earlier than pouring the plaster, in order that no undesirable marks are captured within the mould. Subsequent, safe a bit of PVC piping to the middle of the form to create a pour gap. Utilizing PVC piping permits me to have consistency with the dimensions and placement of the pour gap when producing a number of molds of the identical form (5).

how to make a plaster mold for slip casting
Kaleidoscope I, 5 ft. 9 in. (1.8 m) in peak, porcelain, paint, 2018.

Need extra details about hanging ceramic artwork? Try this publish for information on the right way to map out ceramic set up artwork for the wall.

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**First printed in 2019.

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