Some Insights into Parison Control on Extrusion Blow Molding Machines

Understanding and utilizing parison control systems in extrusion blow molding can lead to improved product quality, cost savings, and design versatility. Whether opting for a servo or hydraulic system, selecting the right setup will depend on your unique production needs and budget.

Effective parison control is essential for ensuring precise thickness control during the extrusion blow molding process. Let’s delve into the components, functions, and considerations when using parison control systems.

1. Components of a Parison Control System

A parison control system is made up of several crucial components that work together to regulate the parison's thickness. These components typically include:

• Parison Hydraulic Cylinder
• Precision Filter
• Pressure Accumulator (optional based on product type)
• Parison Controller
• Hydraulic Cylinder Control Valve
• Hydraulic Motor

2. Clarifying the Role of MOOG in Parison Control

Many customers mistakenly believe that MOOG equals the entire parison control system. In reality, MOOG is just a leading brand known for its parison control technology, widely used in extrusion blow molding machines. While MOOG offers reliable systems, it is one of several brands available in the market.

3. Purpose of Parison Control Systems

The primary function of the parison control system is to manage the thickness of different vertical sections of extrusion blow molded products like bottles or containers. The system enables adjustments across multiple points—typically 100, but some require 200 or more. Key advantages of parison control include:

• Weight Adjustment: Adjust the thickness without changing the mold to achieve desired weight variations.
• Cost Reduction: Thin certain areas to reduce material usage and production costs.
• Product Strengthening: Reinforce weak sections like the neck or bottom for enhanced durability.
• Cycle Time Reduction: Thin sections for faster cooling, reducing production time and increasing output.
• Expanded Product Range: Tailor designs to meet unique customer demands.

4. Factors to Consider When Implementing Parison Control

Whether to invest in a parison control system depends on your project’s scope and budget. For long-term production, the system offers benefits like product strength, cost savings, and the ability to produce complex designs, providing a competitive edge in the market.

5. Choosing Between Servo and Hydraulic Systems The decision between a servo or hydraulic parison control system depends on your project’s specific needs. Servo systems provide advanced technology, higher precision, and energy efficiency, but come with a higher cost and require skilled technicians. Hydraulic systems, while less precise, are easier to operate and more cost-effective. The choice should align with your production requirements and budget.