Ever wondered what does it take to create those diverse range of plastic products that we use on a regular basis? There are varied techniques of molding that are used for creating such products, of which two of the most popular ones are rotational molding and injection molding. In recent years, rotational molding, also called rotomolding, has emerged as a good choice for creating hollow but durable plastic products. On the other injection molding is one of the oldest and most effective means of plastic molding that allows manufacturers to produce plastic parts in bulk. In this post, we take a look at how both these techniques compare with one another.
Reviewing the processes
Rotomolding relies on liquid or power resin material, which is placed in a mold with colorant. The mold is then rotated bi-axially in an oven. The heated material than turns into liquid and covers the entire surface of the mold, thus taking the shape. Once the process is complete, the mold is then cooled down and the final product is taken out.
Injection molding is very different in that context. The process starts with melting the resin material, which is then forced into a stationary mold at a very high pressure. The pressure causes the material to cover the entire surface of the mold, just taking the shape. The plastic part is taken out after the mold has been cooled.
Applications and uses
Rotational molding is a great choice for producing plastic parts that are meant to be hollow and durable at the same time. For instance, waste bins, tanks, and even manholes can be made using this technique. On the other hand, injection molding is often used for creating a wider range of designs and varieties of plastic products. It does also work with a whole range of materials. In other words, it would be wrong to say that one process is better than others. However, with rotomolding, there is little or no loss of material – a factor that often remains a concern with injection molding.
Final word
Both injection and rotational molding techniques are popular and have a wide range of advantages, and the applications may vary. When you want large, one piece and hollow items, you have to consider rotational molding over everything else, but that doesn’t necessarily mean that injection molding doesn’t have its use and benefits. Check online to find companies that specialize in rotational molding and ask for estimates.
