Industrial Automation and Motion Control Blog | The Knotts Company

This post is brought to you by Proportion Air.

A Little Background on Back Pressure

Pump manufacturers test their products to verify achieving the required flow at the pressures stated in specification documentation. Back pressure similar levels that are encountered by the pump in the system must be simulated for the test.

This post is brought to you by Proportion Air.

Problem in Gas Assist Injection Molding

Gas assist injection molding is a commonly used process to make plastic parts today. It allows parts to be light weight and more sturdy than solidly molded parts. Plastic is injected into the mold followed by high pressure gas to force the plastic to the outside of the mold. The end product is a part that is hollow inside.

Several years ago a customer contacted Proportion Air for help in this molding process that he was perfecting. The customer wanted to proportionally control pressure by adjusting his command signal from his PLC (Programmable Logic Controller) to Proportion Air's electronic high pressure regulator. He needed pressure to be as repeatable as possible and he wanted to work up to 5,000 psig. The media used was nitrogen.

Solution in a High Pressure Regulator

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Plastic Parison Extrusion Blow Molding

Description

Parison blow molding of intricate plastic bottles and other plastic parts requires air pressure control that is precise, repeatable and rapid responding. Proportion-Air offers electronic closed loop pressure and flow controls that are used to improve processes in the plastics blow molding industry. Once set, the control profile can be saved to a file in the customer’s PLC. Change over to make a different part becomes as easy as pushing a button. The electronic pressure controllers can be factory-tailored to any application requirement.