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Making Items With Injection Molding

By Genevive B. Mata


Creating plastic toys, pieces and components can be done in a number of ways, depending on certain factors such as to what the purpose of that item is to be. Each aspect of this procedure has to be carefully calculated to accommodate for each product's specific structural and functional issues. One method that proves most effective in many circumstances is injection molding.

In this process, products are fabricated by injecting very specific materials into a designed mold. There are many variations on how this method may be executed and even more options as to which substances can be utilized. The choices of method and construction are going to depend on several factors of what the item will be expected to do when fully realized.

This process is the preferred method for making plastic pieces, both for single production and mass manufacturing. It is used to make a variety of things such as molded toys, dishware, bottle caps, electronic housings, combs, containers and various machine components. Various car parts, from the smallest connector to an entire panel, are created in this way.

Two of the advantages of this method are a huge selection of materials to use and a lower cost for labor. The molds make it easy to produce thousands of replicas with ease, and when the right substances are used, items made through this process have a high stress tolerance. Very little waste is generated because the pieces are so precisely formed that it is rarely necessary to cut excess from the whole for finishing.

As with most everything, the procedure does have its share of disadvantages. As an example, there are operational limitations involved due to set up requirements. Another thing is that the cost of creating the initial mold can be quite costly, though if used multiple times, it does eventually pay for itself.

Practically any polymer, including thermoplastics of all types and several different thermosets and elastomers, are great for this process. With so many different types of materials available, the fabrication choices are beyond numerous. The individual substances can be blended or mixed with alloys to create designer formulas to best suit the purpose.

What the molded piece will be used for will determine which material, or mixture of multiple ones, will be the best choice. Some products will need to withstand a greater amount of stress or function in more intense temperatures than others will, so the composition must meet those standards. The range of possibilities of what may be created in this manner is vast and varied.




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