Blow Molding & Injection Molding Comparison

Injection-molded and blow-molded plastic parts are so pervasive in everyday life that the two processes are sometimes thought of as interchangeable. While the two may be used in an individual application, they serve different purposes and markets.

GENERAL USES
Blow molding is best suited for hollow, relatively rugged, and usually single-piece commodity parts such as plastic bottles, stadium seating, children’s outdoor toys, traffic safety products, component housings, and carrying cases.

Injection molding is ideal for applications requiring intricate part geometries, tight tolerances, and precision repeatability in production. Under-the-hood automotive components, medical devices, and defense & public safety equipment generally need high-performance, highly engineered, and consistently reliable devices constructed using injection molded parts.

TOOLING
Blow molding uses air and hollow-shaped tools to create the completed product. Since the resin blown into each side of the tool forms its own wall, unique shapes can be achieved and one-piece construction completed. Secondary processes are often needed to remove excess material or to create openings. Blow molding is efficient but not necessarily highly technical.

Injection molding combines the deep materials knowledge of an experienced injection molder and scientific molding to perfectly control material flow for oftentimes exceptionally small and detailed components. The precision of the tooling is critical, so elements such as wall thickness and tight tolerances are maintained to margins as little as +/- .001” and parts work flawlessly on their own and with others for consistent, no-fail performance.

MOLDER CAPABILITIES
Blow molding is ideal for single-piece, low-tech products. A blow molder must be proficient to prevent poor welds, blowouts, and other common blow molding obstacles, but the process itself and the components it produces are not overly complicated. OEMs often feel comfortable using blow molders with which they don’t have an extensive history or those located overseas since the need for close supervision and the risk presented by potential defects are relatively low.

Injection molding is the solution for OEMs needing high-performance, highly reliable plastic components and devices developed under advanced processes including scientific molding and Design for Manufacturability to optimize all facets of production. Engineering support, guidance in materials selection, comprehensive testing and clear ongoing communication are necessary and prioritized to ensure accuracy and quality, which underscores the need for OEMs to partner with an injection molder that is accessible and experienced.

Since 2012, QTC has started helping global clients solve plastic fabrication issues in China. They are specialized in producing all kinds of plastic injection molding, blow molding, silicone molding, extrusion molding products, etc. QTC works with more than 24 China plastic manufacturers. Meanwhile, they have good relationships with plastic material suppliers and molding factories. We can control the whole process from plastic material to finished products. That’s why, their clients can save at least 45% than manufacturing in the US, and at least 18% than working with other competitors in China. Until now, QTC has handled over 120 plastic fabrication projects for US & European clients.

Injection-molded and blow-molded plastic parts are so pervasive in everyday life that the two processes are sometimes thought of as interchangeable. While the two may be used in an individual application, they serve different purposes and markets. GENERAL USES Blow molding is best suited for hollow, relatively rugged, and usually single-piece commodity parts such as…

Injection-molded and blow-molded plastic parts are so pervasive in everyday life that the two processes are sometimes thought of as interchangeable. While the two may be used in an individual application, they serve different purposes and markets. GENERAL USES Blow molding is best suited for hollow, relatively rugged, and usually single-piece commodity parts such as…

Leave a Reply