Key Differences Between Variable Pitch Blow Molding Machines and Standard Bottle Molding Machines
The primary distinctions between variable pitch blow molding machines and standard blow molding machines lie in their working principles and applications.
1.Working Principles
1.1 Variable Pitch Blow Molding Machine
- Material Feeding: Raw materials are injected into the machine’s screw via a controller.
- Plastic Homogenization and Melting: The screw rotates to gradually heat and homogenize the material, achieving uniform melting through heat transfer in designated zones.
- Air Injection: Once the preform reaches the optimal state, the machine activates air injection through the inlet. The pressurized air fills the cavity, shaping the preform into the desired bottle form.
- Molding and Ejection: After the bottle solidifies, the mold head releases, and the ejection mechanism pushes the finished bottle outward in reverse.
1.2 Standard Blow Molding Machine
- Preheating: High-temperature lamps heat and soften the body of the preform. The neck area remains unheated and is cooled using dedicated cooling devices to retain its shape.
- Blow Molding: The preheated preform is placed into a mold, and high-pressure air inflates it into the final bottle shape.
- Cooling and Demolding: The formed bottle is rapidly cooled to room temperature via a cooling system to ensure hardening and smooth demolding.
2.Applications
2.1 Variable Pitch Blow Molding Machine
- Primarily used to produce PET, PP, PC, PVC, and PE plastic containers.
- Automatically adjusts the mold-screw angle and rotation speed based on product specifications, ensuring higher-quality output.
- Ideal for scenarios demanding precision and superior-quality plastic containers.
2.2 Standard Blow Molding Machine
- Widely applied in manufacturing beverage bottles, mineral water bottles, edible oil containers, and food jars.
- Features a simpler working principle and high production capacity, making it suitable for large-scale, high-volume manufacturing.
