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How To Demonstrate Injection Molding To Your Technical Education Students

If you are a high school technical education teacher, you probably have several projects in your classroom that will teach your students some valuable and applicable job skills. Industrial skills are currently in high demand in various parts of the country, so incorporating some of these skills into your lesson plans is generally a good idea. Injection molding is one such skill, and here is how you can demonstrate and teach injection molding to your students.

Constructing an Injection Molding Machine (on a Smaller Scale)

Injection molding machines are very large pieces of industrial equipment indeed. However, you can still have your students design and construct a mold injector on a smaller scale. As long as you incorporate a rotating grinder, a feeding portal into which your students can place chopped bits of recycled plastic, a heat source, a push mechanism (like a caulk gun trigger) and a mold into which to push the ground and melted plastic, then you can build a smaller injection molding machine. A brief presentation of a full-sized injection molder will help your students understand what it does, how it works and what they should be attempting to design and build in the "tech ed" shop.

Creating a Mold in the Shop and Using a Caulk Gun for Injection Demonstration

Another possible demonstration you could do is to create a mold, something that has two halves that need to fit together perfectly, then you can do this simpler project.

  1. Be sure to grease your mold or prep it in such a way that it will release easily from the hardened acrylic caulk you plan to use.
  2. Then seal the two halves of the mold together so that none of the acrylic caulk can escape through the mold's edges.
  3. Finally, use the caulk gun, loaded with a full tube of acrylic caulk, to "inject" and fill the whole of the space between the mold halves. Continue to fill the molds until the whole of the open space between them is full.
  4. Allow it to set and dry during class time. Leave it overnight if you need to and then reveal the shape in class the next day by pulling the mold halves apart and removing the solidified plastic caulk shape.

If you want to make this demonstration tasty as well as educational, you could also use a pastry chef's pastry filler gun and meringue, which you then fire to demonstrate the applied heat processes that are frequently involved in injection molding. The project can be completed faster in class, and the students can eat the project when it is complete. To learn more, contact a company like Accurate  Products Inc.