Semi-Automatic 4 Cavity Pet Blow Molding Machine for Mineral Water Bottle with Manual Preform Loading Compact Design for Small Workshop

A standard 2-cavity semi-automatic PET blow molding machine produces 800-1,500 bottles per hour, depending on bottle size and preform weight. A 4-cavity model can reach 1,800-2,500 BPH. Output is lower than fully automatic machines, but the machine costs much less and is ideal for small-scale production or custom short-run orders.

Typically 1-2 operators are sufficient. One operator loads preforms into the heating station and transfers heated preforms to the mold; a second operator can assist with unloading bottles for higher-speed models. After 1-2 days of training, workers can operate the machine independently.

Yes, mold change is fast and easy. You can switch between different bottle shapes (round, square, flat, custom) in 15-30 minutes by changing the blow mold. This flexibility makes semi-automatic machines perfect for factories that run multiple products or accept small custom orders (500-5,000 pcs per run).

A semi-automatic blow molding machine typically costs USD 3,000-12,000, while a fully automatic model ranges from USD 20,000-100,000+ depending on cavities and automation level. For startups or factories with budget under USD 15,000, the semi-automatic option offers the best ROI with low risk and quick payback (usually within 6-12 months).