While the initial cost of designing and manufacturing an injection mold can be high, the per-unit cost of each produced part is incredibly low. This is the key financial advantage of plastic injection molding, making it the most economical choice for mass production. Once the mold is ready, the production process is automated, fast, and requires minimal labor per part, driving down costs to a fraction of a cent in many cases.
For a company producing disposable razors, which are sold in billions of units globally, every cent of cost matters. The razor handle is a small plastic part, but when multiplied by millions, the cost becomes significant. By using a highly efficient injection molding process, the company was able to produce each handle for less than $0.01. This low per-unit cost was the foundation of their business model, allowing them to offer a high-quality product at a price point that was accessible to a massive global market. The sheer volume of production amortizes the initial mold cost, making each subsequent part incredibly cheap to produce.
The toy industry is another excellent example. A company manufacturing a popular plastic toy with millions of units sold annually relies on the low per-unit cost of injection molding to remain profitable. The initial investment in the molds was high, but with a production run of over 50 million units, the mold cost per unit was negligible. This allowed the company to sell the toy at a competitive price while maintaining a healthy profit margin. The inverse relationship between production volume and per-unit cost makes plastic injection molding a powerful engine for profitability in a high-volume market.
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