Rotational Molding vs. Injection Molding: What Makes the Better Business?

Plastic molding companies make for very safe bets in the business world, owing to superior technology and expertise that goes a long way in the market. Aside from using the technologies to help develop and craft your own products however, they also stand alone as robust businesses in their own right. Here we take a deeper dive into the two biggest subsets of the industry; rotational molding and injection molding, while also looking at the differences and comparisons between them.

What Are They?

First things first, let’s develop our understanding of these separate technologies.

Rotational molding involves a mold spinning at even or consistent speed as the resin (usually poly-based) is injected inside allowing it to cover all dimensions of the mold as it continues to spin and shape. As the mold spins, controlled temperature changes, specifically from hot to cold, enables the material to harden and firm in a smooth and even manner. To find out more about the exact process, check out rotational molding from FiberTech.

Injection molding, on the other hand, works in much the same way except for the spinning dimension. Likewise, injection molding shapes the injected material using the same method via changes in heating and cooling.

Opportunities, Limitations and Benefits

While it is generally true that rotational molding has one distinct disadvantage in comparison to injection molding, namely that there are fewer materials suitable for its use, the two processes don’t have too much between them.

While only poly-based resins, plastisol and nylon can be used in the products formed by rotational molding, injection molding only has a few more materials adept for its use, including different plastics, resins and other materials. Something to take into account when considering the different technologies.

One large factor however is the complexity of rotational molding, meaning that it is a little more difficult to use the process with more intricate design patterns and is better suited to simpler shapes. Injection molding allows a little more leeway in this regard but might prove a little slower and more inefficient when compared to how rotational molding deals with elementary designs.

Profit and Production

As both these technologies capitalize on automated production lines they are both inherently fast and efficient in production. One potential difference is time, owing to the fact that rotational molding requires each piece being on the production line a little longer, so injection molding has a more parts per minute.

Profit wise this also spills over as injection molding companies will be able to produce slightly lower costs per piece due to the time difference. Rotational molding however, comes into the fore when compared to accuracy and a very low rate of defects.

The materials, from a business profitability perspective, will also be something to consider. Generally, due to a more limited number of materials suited for its use, rotational molding resins and plastics are on the more expensive side – couple that with certain additives they require and the price can creep up still.

Post Author: Makay Oliue