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Molded Plastic: The Manufacturing Process Shaping Modern Products
Molded plastics are polymer products manufactured by shaping liquid or softened plastic material into a specific form within a mold cavity. This is a cornerstone manufacturing process that produces a vast array of parts, from tiny components to large automotive body panels. The most common techniques are injection molding, where molten plastic is forced into a closed, hardened steel mold under high pressure; blow molding, used for hollow objects like bottles; rotational molding for large, seamless, hollow parts; and compression molding for thermosets like melamine. The choice of method depends on the part's geometry, required material properties, production volume, and cost. Each process leverages the unique behavior of thermoplastics, which soften when heated and harden when cooled, allowing for high-volume, repeatable production.
The applications of molded plastics are ubiquitous and critical to modern life. Injection molding alone produces countless consumer goods, including appliance housings, toys, kitchenware, and electronic device casings.…