How To Make Plastic Sheet Molds

The first thing you need to have for creating a plastic part is a mold.

How to make plastic sheet molds. I want to make molds for pouring concrete into. The plastic i have melted so far has set a bit too rigid for casting anything with undercuts. Cover a flat area with plastic trash bags to avoid mess and spray the plastic with a mold release agent. On the first day prepare your template object and work space.

Each sheet should be 6 inches longer than the mold. Remove the excess water by squeezing the sheets over the bowl. Once your part is formed it has to be shaped. The sheets should be wet not dripping with water.

Layer the sheets on top of eachother. Measure the inside of your oven. Have a mold ready to use. Make adjustments appropriate to the specifications of your project.

Get the right mold material. The best part of rtv is it comes in the form of liquid until you add the required catalyst. Lay the sheets over the mold and up the retaining walls. Recycling plastic for making the molds for the concrete would make good use of what would otherwise be pollution.

The example here is the outside of a mold but it can work inside too. Build a molding box a frame that holds the mold in place that is bigger than the size of your template object. Dip the sheets in bowl filled with room temperature water for 1 second. Cool plastic is hard plastic.

As you ll need to put the plastic sheet into the oven this is your size limitation. Does anyone have knowledge of melting plastic and retaining its pliability.