Blow Molding vs. Injection Molding
Process Differences｜Cost Analysis｜Application Guide
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Blow Molding vs. Injection Molding
Differences in Molding Principles
| Item | Hollow Blow Molding / Extrusion Blow Molding | Injection Molding |
| Principle | Uses air pressure to inflate molten plastic parisons against the mold cavity, forming a hollow structure. | Uses high pressure to inject molten plastic into a closed mold cavity, which cools into a solid structure. |
| Process Focus | Air pressure + mold cooling | Injection pressure + cavity filling speed |
Product Type Applications
| Item | Blow Molding | Injection Molding |
| Typical Products | Hollow products such as bottles, tanks, oil containers, automotive air ducts. | Solid or complex-structured products such as 3C housings, toys, appliance parts, plastic fasteners. |
Mold & Equipment Differences
| Item | Blow Molding Mold | Injection Mold |
| Differences | Relatively simple two-part mold structure, focused on airflow channels and cooling uniformity. | More complex mold structure, requiring runners, gates, vents, and high manufacturing precision. |
Materials & Environmental Applications
| Item | Blow Molding | Injection Molding |
| Material Applications | Commonly uses flexible thermoplastics such as PE, PP, PET, widely applied in recyclable hollow containers. Considered a key low-carbon, lightweight packaging process. | Can use a wide variety of plastics such as ABS, PC, PA, etc. Although not hollow, structural design can reduce material usage and enhance recyclability. |
Dih Hong Plastic Advantages
Dih Hong Plastic focuses on hollow blow molding and blow mold manufacturing, skilled in high-precision, multi-cavity mold design, and providing customized blow molding solutions. With mold flow analysis and energy-saving process optimization, we assist clients in achieving production processes that integrate efficiency and environmental sustainability, serving industries including packaging, medical, automotive, and household hollow products.