Webinar: Step Three of the Molding Cycle, Applying Pressure

Articles, Published Webinars

Plastic pressure is one of the four basic plastic variables. Establishing accurate control is vital to a repeatable molding process.

Of course we’re all familiar with the high pressures utilized during the molding cycle. High pressure is used to keep the mold halves closed during injection and high pressure is used to inject plastic into the cavities. In this FREE Webinar we’ll discuss the examine the principles of plastic pressure.

Pressure is required to make any liquid flow and pressure drop occurs along the flow path. In injection molding, high pressures are required because plastic is quite viscous, (resistant to flow), and gate sizes are small, so they’ll freeze quickly. Of course, all the plastic required to form the parts must flow through these small gates.

The accurate measurement of plastic pressure during the molding cycle gives us a lot of information. However, measuring plastic pressure in the cavity can be costly and is not commonly done. However all machines measure injection pressure during the molding cycle and this can be nearly as useful.

Plastic pressure and flow rate are closely related. Higher injection pressures increase flow rate which increases molecular orientation. It also decreases viscosity, making cavity filling easier. As with the other three plastic processing variables, maintaining a consistent injection pressure will help produce parts with consistent properties.

Topics covered include:

  • An explanation of the plastic pressure in the molding process
  • How plastic pressure variations affect part properties
  • How to interpret injection pressure data to optimize the molding cycle
  • How to use the minimum injection pressure setting that will make good parts


Take part in this FREE webinar to learn and apply molding techniques that will dramatically change the way you process.


Special Guest: Donald C. Paulson

2021 Plastics Hall of Fame Inductee, (read more here), Donald Paulson is the founder and chairman of Paulson Training Programs, Inc. and the creator of the now widely accepted method of teaching plastic processing from the “Plastics Point of View”. Don will join this webinar and give his personal account of his years of research with the General Motors Institute that lead to transforming injection molding from an art to a science. An experience you won’t want to miss.

Visit our webinar page to register for this webinar and upcoming topics. Also, gain access to previously recorded webinars. There’s a wealth of knowledge from Paulson all at your fingertips!

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