Structural Foam Molding

Structural Foam Molding

Structural foam plastic molding is an injection molding process that utilizes a foaming agent that mixes with the base resin in the polymer melt before being injected into the mold. This mixture becomes a combined polymer/gas melt. This process allows for less volume of plastic than a solid injection molded part to completely fill the mold, or a “partial fill” method. The lesser polymer volume requires less clamping pressure on the molds. This is often described as a low-pressure molding process. Due to the lower pressure and forces involved, the structural foam process allows very large parts and/or multiple parts to be produced on a single machine and in a single cycle. Additionally, cost-effective tooling solutions can be utilized for these large or multi-cavity molded products.

As the foamed plastic flows through the mold, the surface cells burst and a solid skin is formed against the walls of the mold while the core of the part cools to a cellular structure. This results in a part that typically weighs 20% less than a solid plastic part, is 3 to 4 times more rigid, and is produced with less molded-in stresses. Parts may weigh up to several hundred pounds.

From a conversion perspective, structural foam molding can replace wood, metal, concrete, and fiberglass. It can also have significant advantages in relation to alternative processes such as rotational molding, die-cast, stamped metal, smc, thermoforming, rim, and fiberglass layup… The results? Significant reduction in cost and increases in productivity.

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How the Structural Foam Process Works

The structural foam process allows the production of rigid plastic products which have a cellular foamed core surrounded by an outer skin forming a total integral structure. Products molded with the structural foam process have a high strength to weight ratio and are 3 to 4 times more rigid than solid parts of the same weight.

 

 

Before injection into the tool, inert gas is introduced into the melt.
Only a partial shot is used because along with the low machine pressure, the gas creates a foaming action that helps the flow, fill and pack of the mold.
The plastic cells collapse as they come into contact with the wall of the mold creating the solid plastic skin. The foaming action continues to push the leading edges of the melt into the furthest extremes of the mold.
Once the mold is completely packed out and begins to cool the ‘frozen’ outer skin becomes solid and rigid. The inner core develops a cellular or honeycomb structure when cooled.

Discover More About Structural Foam Molding

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We Are Structural Foam

Structural Foam Solutions

Quality Assurance

Unsurpassed Customer Satisfaction

The team at DeKALB Molded Plastics has a strong commitment to customer satisfaction in order to develop
strong partnerships that are positioned for long term success. After more than 30 years in the business, our
development processes have been perfected through our dedication to industry demands.

Specialty
Material Handling

Specialty <br>Material Handling

Medical Housings, Structures, & Cabinetry

Medical Housings, Structures, & Cabinetry

Safety Enclosures
& Devices

Safety Enclosures <br>& Devices

Additional Markets

Additional Markets

A Partner You Can Trust

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Comparison of Structural Foam to Other Processes

Features

Structural Foam RIM Pressure Forming Stamped Metal Diecast Metal Fiberglass Layup Rotational Molding SMC
Tooling
Variable Walls
Part Complexity
Finishing Cost
Volume (EAV) 200-2000 50-2000 50-1000 50-10000 50-5000 50-1000 50-1000 1000-25000
Dimensions
Mechanical Strength
  • Strength/Advantage
  • Neutral/Moderate
  • Weakness/Limited

What’s the Best Process for You?

At DeKALB Molded Plastics, we specialize in 1-8 foot, multi-nozzle plastic products from 3-150 pounds. With presses ranging in tonnage from 300 to 750 tons, we are well equipped to handle a variety of projects that require large plastic components.

The structural foam process offers one of the most robust technology platforms available, when you consider part complexity versus part size.

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What’s the Best Process for You?

At DeKALB Molded Plastics, we specialize in 1-8 foot, multi-nozzle plastic products from 3-150 pounds. With presses ranging in tonnage from 300 to 750 tons, we are well equipped to handle a variety of projects that require large plastic components.

The structural foam process offers one of the most robust technology platforms available, when you consider part complexity versus part size.

Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.

  • Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
  • At nulla pariatur Excepteur sint occaecat cupidatat non proident, sunt in
    • Culpa qui officia deserunt mollit anim id est laborum.
    • Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium
      • Doloremque laudantium, totam rem aperiam, eaque ipsa quae ab illo inventore
  • Veritatis et quasi architecto beatae vitae dicta sunt explicabo.

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DeKALB is a professional company
with excellent customer service. Whenever we need parts expedited, they do everything they can to accommodate our request.

Sauder Manufacturing

DeKALB is a professional company
with excellent customer service. Whenever we need parts expedited, they do everything they can to accommodate our request.

Sauder Manufacturing 2

DeKALB is a professional company
with excellent customer service. Whenever we need parts expedited, they do everything they can to accommodate our request.

Sauder Manufacturing 3

DeKALB is a professional company
with excellent customer service. Whenever we need parts expedited, they do everything they can to accommodate our request.

Sauder Manufacturing 4

Structural Foam Plastics Molding

What we offer at DeKALB

Structural Foam Molding

Structural Foam Molding

Gas Assist Molding

Gas Assist Molding

Process Comparisons

Process Comparisons

Do You Fit The Mold?

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Choosing the Right Material for Structural Foam & Gas Assist Molding

Material choice influences nearly every aspect of a molded part, from structural strength to cosmetic finish. For structural foam and gas assist molding, selecting the right thermoplastic is essential to getting the most from the process. Each resin behaves differently under pressure, heat, and flow conditions, which means material decisions must be grounded in performance, […]

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