Posts by Mandy Beaumont

Beaumont’s NEW Molding Genius

ERIE, PA – Beaumont Technologies is excited to announce that we have released our latest molding innovation that our industry can benefit from for no charge.

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LinkedIn Answer: Is this mold balanced?

Original Question: Assuming steel is uniform which cavities will fill first?


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Eight-Cavity LinkedIn Mold Answer and Explanation

Original Question: Assuming steel is uniform which cavities will fill first?

Understanding Rheology

Facts about plastic flow that help explain shear imbalances:

  • Plastic viscosity is affected by shear rate
  • As shear rate increases, viscosity decreases (non-Newtonian)
  • Plastic viscosity is also affected by temperature
  • As temperature increases, viscosity decreases


  • Plastic has a laminar flow. No turbulence!! Reynolds numbers are often less than 10. Full turbulence requires a Reynolds number of 4000. Transition zone 2300-4000. Highest Shear Rate is just inside the frozen layer
  • Highest Shear Rate is just inside the frozen layer. Shear-thinning and shear-heating reduces viscosity in these laminates.
  • Due to the laminar flow, when plastic encounters a feature such as a intersection in a runner system, the hotter, less viscous plastic hugs the corner and travels along the outside wall, creating a cavity to cavity imbalance.
  • Cross sections of runner channels showing position of higher sheared, hotter, less viscous material in red. Material that has experienced less shear heating is marked with blue.
    picture5 picture6

    Mold Number: LinkedIn
    Current Conditions:

  • The red lines again represent the higher sheared, less viscous material; the blue lines shows the less sheared more viscous material.  Various melt properties will be distributed to and across the cavities.  The various melt properties will result in 2 Flow Groups (FG) as shown below.picture7


  • Cavities that receive the high sheared, less viscous material will fill before the cavities that will receive the low sheared, more viscous material.
  • Dimensional variations, due to volumetric and orientation induced shrinkage differences,  may result between the cavities as a result in the variation the melt distribution properties


Answer to

LinkedIn Mold:

Cavities 2,4,5,and 7

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Beaumont Teams Up With Sodick Plustech

Read why Beaumont Technologies chooses Sodick Plustech machines.

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Beaumont Welcomes New Regional Sales Manager

CHARLOTTE, NC —Matt Piatek has joined Beaumont Technologies, a global plastics engineering leader, in the role of regional sales manager for the southeast region of the United States.

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Beaumont’s Holiday Party

Beaumont employees brought their yuletide cheer to the annual holiday party. This year employees played a few games of duck-pin bowling, ate lots of food and had a merry ‘ol time! Check out some of the evening’s highlights below…

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